法国专利FR3053101A1 VEHICLE HEADLIGHT AND LIGHT SOURCE UNIT

专利PDF首页>>法国专利

专利附录

专利说明

权利要求

类似技术

同族专利

引用文献

法律状态

优先权

专利摘要:
A vehicle headlight (10) includes a headlight chamber and a light source unit (20). The light source unit (20) is configured such that a light emitting element (22) which is a light source and a reflector (24) which reflects the light emitted by the light element. light emission (22) to a front of the headlight chamber are integrally mounted on an upper surface of a metal base plate (31) constituting a heat sink (30) in cooperation with a plurality of fins heat sink (34), substantially L-shaped, extending from a lower surface of the base plate (31), the light source unit (20) being disposed in the lighthead chamber.
公开号:FR3053101A1
申请号:FR1755895
申请日:2017-06-27
公开日:2017-12-29
发明作者:Hiroki Matsumoto
申请人:Koito Manufacturing Co Ltd；
IPC主号:

专利说明:

The present invention relates to a vehicle headlight in which a light source unit where a light emitting element which is a light source and a reflector which reflects light emitted from the transmitting element forward light are mounted in one piece on a heat sink is housed in a headlight chamber defined by a headlight body and a front cover. Here, the light-emitting element means an element-shaped light source having a light-emitting portion that emits light in a substantially dot-shaped manner. The type of the light emitting element is not particularly limited. For example, a light emitting diode or a laser diode or the like can be adopted.
Recently, a vehicle headlight has been proposed in different ways as a structure in which a light source unit provided for light distribution formation and having a light emitting element as a light source is housed in a lighthouse chamber to reduce energy consumption. Thus, a light emitting element capable of obtaining a high luminous flux corresponding to the luminosity necessary for the light distribution of a headlight has been developed. However, in this case, the amount of heat generated by the light emitting element has become a problem. That is, in the light-emitting element corresponding to the high luminous flux, the high luminous flux is obtained, while the amount of heat generated is correspondingly increased. This results in problems such as a decrease in light output or a luminescent color change.
For these reasons, different structures for increasing the cooling effect of the light emitting element have been proposed. For example, as disclosed in Japanese Patent Laid-open Publication No. 2010-153333 (see Figs. 2 and 4), a heat sink 9 is configured such that heat sink fins 11 are formed behind a base plate 10 on which a light emitting element 3 and a reflector 2 are mounted, and thus, the heat generated by the light emitting element 3 is dissipated to the rear side of the heat sink 9.
In addition, as disclosed in Japanese Patent Laid-open Publication No. 2014-146463 (see Fig. 1), a cooling fan 12 is provided to directly face fins. heat dissipation 15 of a heat sink 11 on which a light emitting element 14 and a reflector 10 are mounted, thereby promoting heat dissipation.
However, in the first patent document above, it is necessary to enlarge the heat sink fins 11 of the heat sink 9 to increase the cooling effect of the light emitting element . Thus, the front-back length of the light source unit is increased. However, there is a limit with respect to a reception space of the light source unit in a lighthouse chamber.
In addition, in the second patent document above, the cooling effect is increased by the air flow generated by the cooling fan 12 without enlarging the fins of heat dissipation 15. The number of parts constituting the light source unit is however increased. As a result, the configuration becomes complicated, the weight is increased, and the cost is also increased.
The present invention has been made because of the above-described problems of the prior art and an object thereof is to provide a vehicle headlight comprising a light source unit which is not provided with a cooling fan but is compact and excellent in the cooling effect of a light emitting element.
In order to achieve the above object, a first aspect of the embodiments provides a vehicle headlight comprising: a headlight chamber defined by assembling a front cover at a front opening portion of a headlight body in the form of a receptacle; a light source unit configured such that a light-emitting element which is a light source and a reflector which reflects light emitted by the light-emitting element to a front of the light-emitting chamber; headlight are mounted integrally on an upper surface of a metal base plate constituting a heat sink in cooperation with a plurality of heat dissipating fins extending from a lower surface of the base plate, the a light source unit being disposed in the headlight chamber, wherein the heat dissipating fins are arranged in parallel in a left-right direction of the base plate and are formed in a substantially L-shaped shape in a side view extending in a front-to-back direction from a front side of the base plate to a rear top side of the base plate.
[Function]
The heat of the light emitting element is transferred to the heat sink fins through the base plate of the heat sink and is dissipated by the heat dissipating fins in the air. The heat dissipating fins are adjacent to each other in the left-right direction of the base plate and extend in a substantially L-shaped shape in a side view from the front side to the bottom side. and to the upper back side of the base plate, and the heat dissipation surface of the heat sink (heat sink fins) is large. That is, compared to a conventional heat sink (a structure in which the heat dissipating fins are formed on the bottom or rear side of the base plate), the heat sink (dissipation fins of the present invention has a greater heat dissipation area and is also excellent in the cooling effect of the light emitting element.
More particularly, the distances from the heat dissipating fins extending on the front side of the base plate and the heat dissipating fins extending on the back side of the base plate to the base plate. light emitting element on the base plate are substantially the same, and the heat can be almost uniformly dissipated from the lower side, the front side and the back side of the heat sink. As a result, the cooling effect of the light-emitting element is correspondingly excellent and the light-emitting element can be efficiently cooled without adopting large heat-dissipating fins or a fan. .
In addition to the first aspect of the embodiments, a second aspect of the embodiments has a configuration in which the base plate is arranged to be tilted forward or backward.
[Function]
The heat of the light-emitting element which is a light source is dissipated into the air from the heat sink fins formed in a substantially L-shaped shape in a side view extending from the front side to the upper rear side of the base plate. When the base plate is disposed horizontally, the heat of the light-emitting element is uniformly transferred from the light-emitting element mounting position of the base plate in a radial direction in a view in plan, that is to say in a view from above. That is, the amount of heat transfer is constant in any position around the light emitting element. However, when the base plate is inclined, the amount of heat transfer in the inclined direction is smaller than that in the opposite direction. In other words, the movement (transfer) of heat is favored in the opposite direction to the direction in which the base plate is inclined.
For these reasons, in a second aspect of the embodiments, the base plate is caused to be inclined in the front-rear direction. Although the total amount of heat transferred from the light emitting element to the heat sink fins through the base plate is the same, heat transfer (transfer) to the back side ( front side) of the base plate is favored in a form in which the base plate is tilted forward (towards the rear). As a result, the amount of heat dissipation from the heat dissipating fins extending on the back side (front side) of the base plate is increased, compared to the amount of heat dissipation from the heat sink fins. Heat dissipation extending on the front side (back side) of the base plate.
Furthermore, when heated air on the bottom surface of the base plate rises along the bottom surface of the inclined base plate, the air flow is generated in an air passage which is formed by the heat dissipating fins extending from the bottom surface to the front side and to the rear top side of the base plate and which is substantially L-shaped in a side view extending into the front-back direction. This airflow increases heat dissipation of the heat sink.
For example, in the case where there is a difference in the heat dissipation surface of the heat dissipating fins formed respectively at the front and rear of the base plate because of the difference in the number and size of the heat dissipating fins, the base plate is arranged to be inclined (forward or backward) in the front-to-back direction so that more (less) heat is transferred heat dissipating fins with a larger (smaller) heat dissipation surface. In this way, the cooling effect of the light-emitting element can be increased.
In addition to the second aspect of the embodiments, a third aspect of the embodiments has a configuration such that the base plate of the heat sink is arranged to be tilted backward, front edge portions of the heat sink fins. heat dissipation extending over the front side of the base plate are brought into contact with another component of the light source unit disposed adjacent to a front of the heat sink or are integrated with a vertical wall extending in the left-right direction, and a chimney is provided in an air passage constituted by the heat-dissipating fins extending on the front side of the base plate.
[Function]
A front air passage formed by the heat dissipating fins extending on the front side of the base plate communicates with a rear air passage extending in the up and down direction and formed by the dissipating fins. of heat extending over the rear side of the base plate through a lower air passage formed by the heat dissipating fins extending in the front-rear direction on the bottom surface of the plate basic. That is, an air passage having a substantially L shape in a side view extending in the front-to-back direction is formed by the heat dissipating fins extending from the bottom surface. from the base plate to the front and to the rear upper side of the base plate. These heat dissipating fins are substantially L-shaped in a side view and are adjacent to each other in the left-right direction.
Then, by arranging the base plate to be tilted backwards, first, the movement of heat to the front side of the heat sink (base plate) is favored. Second, when the air in the lower air passage, which is heated by drawing heat from the heat dissipating fins extending in the front-to-back direction on the bottom surface of the base plate, rises along from the bottom surface of the downwardly inclined base plate, the forward airflow is generated in the lower air passage. In this manner, as indicated by the arrow in Figure 2, circulating air convection is formed around the heat sink. The air convection rotates vertically forward-upward and backward-downward in the path of the lower air passage -► front air passage- »above the reflector - rear air -> lower air passage. As a result, the light-emitting element can be effectively cooled.
Furthermore, the flow of air flowing upward along the front air passage is accelerated by the chimney effect of the front air passage formed by the fins of heat dissipation. extending on the front side of the base plate. In this way, the circulating air convection, which is formed around the heat sink and rotates vertically forward-upward and backward-downward, becomes active. As a result, the light emitting element can be more efficiently cooled.
In addition to any of the first to third aspects of the embodiments, a fourth aspect of the embodiments has a configuration such that the base plate is formed in an L-shaped longitudinal section, a portion thereof vertical rod shape of the L-shaped longitudinal section of the base plate is formed in a substantially arcuate shape surrounding the light-emitting element in a plan view (top view), among the plurality of heat sink fins extending rearwardly from a rear side of the vertical rod-shaped portion of the L-shaped longitudinal section of the base plate, at least the heat sink fins being closer on both sides in a width direction of the base plate extend in a radial direction with respect to the light-emitting element, and protruding ends of the plurality of dissipating fins. of heat are arranged along a substantially arcuate shape in a plan view to follow a substantially arcuate shape in a plan view of the vertical rod-shaped portion of the longitudinal shaped section. L of the base plate. By "protruding ends" may be meant the ends of the heat dissipating fins extending rearwardly from a rear side of the vertical rod-shaped portion of the L-shaped longitudinal section of the base plate.
[Function]
A large number of heat sink fins extend rearwardly from the vertical rod-shaped portion of the L-shaped longitudinal section of the base plate formed in the L-shaped longitudinal section. Distances from the light emitting element to the rear protruding ends of the respective heat dissipating fins are substantially the same. Therefore, the amount of heat transferred from the base plate to the respective rearwardly extending heat dissipating fins and the amount of heat dissipated from the respective heat dissipating fins in the air are uniformly distributed. As a result, the heat dissipation effect to the back side of the heat sink is increased.
More particularly, in the zone where the heat dissipating fins extend from the vertical rod-shaped portion of the L-shaped longitudinal section of the base plate in the radial direction relative to the element. light emission, spaces between the heat dissipating fins adjacent to each other in a circumferential direction are enlarged towards the protruding ends of the heat dissipating fins, and thus, the air flow in the rear air passage formed between the adjacent heat dissipating fins and extending in the upward and downward direction becomes regular. As a result, the heat dissipation effect to the back side of the heat sink is also increased.
In addition, since the protruding rear ends of the heat dissipating fins extending rearwardly of the vertical rod-shaped portion of the L-shaped longitudinal section of the base plate are disposed along the length of the a substantially arcuate shape in a plan view to follow a substantially arcuate shape in a plan view of the vertical rod-shaped portion of the L-shaped longitudinal section of the base plate, the The rear shape of the heat sink, i.e., the rear shape of the light source unit, is formed in a substantially arcuate shape surrounding the light emitting element in a plan view. Therefore, a tilting radius of the light source unit is reduced when a setting operation or a pivoting drive of the light source unit is performed. Correspondingly, the light source unit hardly interferes with a headlight body or other fire element disposed near the light source unit in the headlight chamber.
A fifth aspect of the embodiments provides a light source unit in which a light emitting element which is a light source is mounted on an upper surface of a metal base plate constituting a heat sink. cooperation with a plurality of heat dissipating fins extending from a lower surface of the base plate, the heat dissipating fins being arranged in parallel in a predetermined direction of the base plate and being formed into a substantially L-shaped in a side view extending beyond the base plate in a direction perpendicular to a layout direction.
[Function]
The heat of the light emitting element is transferred to the heat sink fins through the base plate of the heat sink and is dissipated by the heat dissipating fins in the air. The heat dissipating fins are adjacent to each other in the arrangement direction and are formed in a substantially L-shaped shape in a side view extending beyond the base plate in the perpendicular direction. to the layout direction. Therefore, the heat dissipating surface of the heat sink (heat sink fins) is important. That is, compared to a conventional heat sink (a structure in which the heat dissipating fins are formed on the bottom or rear side of the base plate), the heat sink (dissipation fins of the present invention has a greater heat dissipation area and is also excellent in the cooling effect of the light emitting element.
In particular, the distances from the part of the heat dissipating fins extending beyond the base plate to the light emitting element of the base plate are substantially the same and the Heat can be almost uniformly dissipated from all heat dissipating fins having a substantially L shape in a side view. Thus, the cooling effect of the light emitting element is also excellent and the light emitting element can be effectively cooled without adopting large heat dissipating fins or a fan.
As is apparent from the description above, according to the first aspect of the embodiments, the vehicle headlight comprising the light source unit which is not provided with a cooling fan but is compact and excellent in the cooling effect of the light emitting element can be procured at low cost.
According to the second aspect of the embodiments, the heat sink is arranged to be inclined forward or backward depending on the specifications (characteristics) of the heat sink, that is to say if the heat is dissipated positively from the front side or the back side of the heat sink. In this way, the light-emitting element can be effectively cooled.
According to the third aspect of the embodiments, the active circulating air convection, which rotates vertically forward-upward and backward-downward, is formed around the heat sink of the circulator. light source unit. In this way, the light-emitting element can be more efficiently cooled.
According to the fourth aspect of embodiments, it is possible to provide the vehicle headlight which is excellent in heat dissipation to the back side of the heat sink and is also excellent in the cooling effect of the element. light emission and in which the adjustment operation or the pivoting operation of the light source unit can be performed smoothly.
According to the fifth aspect of the embodiments, it is possible to provide the light source unit which is not provided with a cooling fan but is compact and excellent in the cooling effect of the cooling element. light emission.
Figure 1 is a front view of an automobile headlight according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the lighthouse along the line II-II shown in FIG.
Figure 3 is a plan view (top view) of a light source unit which is a main part of the lighthouse.
Fig. 4 is a bottom view of the light source unit.
Fig. 5 is a rear perspective view of the light source unit.
Fig. 6 is an exploded perspective view of the light source unit.
Figure 7 is a longitudinal sectional view of an automobile headlight according to a second embodiment of the present invention.
Figure 8 is a perspective view of an integrated heat sink with a light source unit which is a main part of the lighthouse.
Embodiments of the present invention will next be described based on the examples.
In Figures 1 to 6 showing an automobile headlight 10 according to an example of the present invention, the automobile headlight 10 is configured in such a way that a projection type light source unit 20 having a light emitting element (light-emitting diode for a large luminous flux) 22 as a light source is housed in a headlight chamber defined by a receptacle-shaped headlight body 12 open on the front side and a plain translucent cover (front cover) 14 fixed on the front opening part.
The light source unit 20 comprises a die-cast aluminum heat sink 30 in which a large number of heat dissipating fins 34 extend from a base plate 31 having a longitudinal section in the form of a tube. L. The light emitting element (light-emitting diode for a large luminous flux) 22 which is a light source and a resin reflector 24 which reflects light emitted by the light-emitting element 22 towards the light source. front side are fixed on an upper surface of a horizontal base plate 31a, which may also be called "horizontal rod-shaped portion" or "horizontal rod" of the longitudinal L-shaped section of the base plate 31.
More specifically, a base 32 for fixing the light emitting element is provided at the central portion of the upper surface of the horizontal base plate 31a constituting the heat sink 30. The base 32 has a surface The light emitting element 22 is fixed to the base 32 with its irradiation axis pointing upwards. The reflector 24 is attached to the rear side of the upper surface of the horizontal base plate 31a and is arranged to cover the upper side of the light-emitting element 22. As shown in FIGS. 4 and 5, a vertical rod portion (hereinafter referred to as a "vertical base plate") 31b of the L-shaped longitudinal section of the base plate 31 constituting the heat sink 30 is formed in a substantially arc of a circle in a plan view with the base 32 as the center. On the rear side of the vertical base plate 31b, the heat dissipating fins 34c, 34d formed to extend rearward at equal intervals in the left-right direction are protruding in the upward direction and the bottom.
Then, a projection lens 50 made of resin is disposed in front of the heat sink 30. A mask mechanism 40 for switching a light distribution is disposed between the reflector 24 and the projection lens 50. The mask mechanism 40 comprises a movable mask 43. These parts are integrated in the form of the light source unit 20.
More specifically, as shown in FIG. 6, on the front side of the heat sink 30, a lens holder 52 for holding the projection lens 50 and a support plate 41 constituting the mask mechanism 40 for to switch a light distribution are fixed together by two fixing screws 54a. The support plate 41 has a rectangular shape in a front view and is open on the central portion. The projection lens 50 is disposed on an optical axis L (see FIGS. 1 and 2) of the light source unit 20. Furthermore, the reference 54b relates to a fixing screw intended to fix the support plate. 41 of the mask mechanism 40 to switch the light distribution to the heat sink 30.
In addition, as shown in Figures 2, 4 and 6, a lighting circuit unit 60 for controlling the illumination of the light emitting element 22 is fixed by two screws 66 on the lower surface side of the heat sink 30. A lighting circuit 62 consists of a platen on which electronic components (circuit elements) are mounted. The lighting circuit 62 is received in a lighting circuit housing 63 and integrated as the lighting circuit unit 60 (see FIG. 2).
Then, when the movable mask 43 is tilted in the front-rear direction by driving an electromagnet 42 constituting the mask mechanism 40 for switching the light distribution, the light distribution formed by the unit light source 20 is switched between a dipped beam and a high beam.
In addition, as shown in FIGS. 1 and 2, the light source unit 20 received in the headlight chamber is supported at three points comprising a pair of set points A, B and a point of rotation. setting C. The pair of set points A, B is spaced in the left-right direction on the upper side of the interior of the headlight chamber, and the set point C is located almost just below the set point B. The light source unit 20 is supported by an adjustment mechanism E so as to be inclined about a horizontal inclination axis Lx passing through the adjustment points A, B and a vertical inclination axis. LY passing through the set points B, C, respectively.
More specifically, as shown in FIGS. 1 and 2, a setting support 70 is fixed in one piece on the rear side of the holding plate 42 of the mask mechanism 40 to switch a light distribution. integrated in the form of the light source unit 20. The adjustment support 70 is provided with holes 70a, 70b, 70c (the holes 70a, 70b are not shown) corresponding to the adjustment points A, B, C and has a rectangular frame shape which is larger in size than the support plate 41. On the other hand, through holes 13a, 13b, 13c (the through holes 13a, 13b are not shown) corresponding to the Adjustments A, B, C are provided in the rear surface wall of the headlight body 10. Adjusting screws 71a, 71b, 71c each provided with a pivoting operation portion 73 are rotatably supported in the through holes 13a, 13b, 13c and extend into the chamber of Lighthouse. Support nuts 72a, 72b, 72c are mounted in the holes 70a, 70b, 70c of the support 70. The support nuts 72a, 72b, 72c are screwed on front ends of the adjusting screws 71a, 71b, 71c, respectively.
That is to say that the adjustment mechanism E is constituted by the adjustment support 70 for supporting the light source unit 20, the three adjustment screws 71a, 71b, 71c and the three nuts. support 72a, 72b, 72c. The inclination of the optical axis L of the light source unit 20 can be adjusted in the left-right direction (the upward and downward direction) by a pivoting operation of the adjusting screw 71a ( 71c). Furthermore, the adjustment support 70 is not shown in FIGS. 3, 4 and 5.
In addition, in the present embodiment, the light-emitting element 22 (light-emitting diode for a large luminous flux) 22 corresponding to the luminosity necessary for a light distribution of the headlamp is adopted as a light source. of the light source unit 20, and thus the amount of heat generation of the light emitting element 22 is important. Therefore, it is necessary to effectively cool the light emitting element 22 and the lighting circuit unit 60 so that the light emitting element 22 and (electronic components of) the circuit 52 are not affected by the heat generated by the light-emitting element 22.
Therefore, in the present embodiment, as shown in FIG. 2, the heat dissipating fins 34 extend in the manner of a plate in the front-to-back direction and extend to be spaced evenly in the left-right direction (width direction) on the bottom surface of the horizontal base plate 31a of the heat sink 30. The heat dissipating fins 34 are formed in a substantially L shape in a view side from the lower front side to the upper rear side of the horizontal base plate 31a. In this way, a large heat dissipation surface is provided. In addition, the lighting circuit unit 60 is disposed in a position immediately below the heat dissipating fins 34 on the underside of the horizontal base plate 31a of the heat sink 30. In this position, the unit The lighting circuit 60 is unlikely to be affected by the heat of the light emitting element 22 as much as possible.
More specifically, as shown in FIGS. 2 and 4, nine lower heat dissipating fins 34a are formed on the bottom surface of the horizontal base plate 31a at equal intervals in the left-right direction so to extend in the front-to-back direction. The lower heat sink fins 34a are then respectively in continuity with the nine forward heat dissipating fins 34b (see FIGS. 2 and 6) extending substantially in a vertical direction to the lower front side of the plate. horizontal base 31a. In addition, the lower heat sink fins 34a are in continuity with the rear heat sink fins 34c, 34d (see Figures 2, 3, 4 and 5) extending rearward from the vertical base plate. 31b and extending in the upward and downward direction. That is, the heat dissipating fins 34 are formed in a plate form in which the front heat dissipating fins 34b, the lower heat dissipating fins 34a and the rear heat dissipating fins 34c (34d) are continuous in one piece. On the other hand, the nine forward heat dissipation fins 34b formed at equal intervals in the left-right direction are formed integrally with an inclined vertical wall 31c (see Figs. 2, 4 and 6) which intersects the side. lower back of the front heat dissipating fins 34b in the left-right direction, so that the rigidity of the heat dissipating fins 34 (front heat dissipating fins 34b) is ensured.
The heat of the light emitting element 22 is then transferred to the heat dissipating fins 34 (34a, 34b, 34c, 34d) via the base plate 31 and is dissipated in the The heat-dissipating fins 34 adjacent to each other in the left-right direction of the base plate 31 and extend in a substantially L-shaped shape in a view from the front side to the lower side and the upper back side of the base plate 31. Compared with a conventional heat sink, the heat sink 30 has a greater heat dissipation surface and is excellent in effect cooling the light emitting element 22.
In particular, the distances from the front heat dissipating fins 34b extending on the lower front side of the base plate 31 and the rear heat dissipating fins 34c, 34d extending in the direction towards the up and down on the back side of the base plate 31 to the light emitting element 22 of the base plate 31 are substantially the same, and the heat can be dissipated substantially uniformly since the lower side, the front side and the back side of the heat sink 30. As a result, the cooling effect of the light emitting element 22 is also excellent and the light emitting element 22 can be effectively cooled without adopting large fins of heat dissipation or fan.
In addition, as shown in Figure 2, the heat sink 30 is arranged such that the horizontal base plate 31a is inclined rearwardly by a predetermined angle Θ relative to the horizontal. Thus, the movement (transfer) of heat to the front side of the heat sink 30 (horizontal base plate 31a) is favored. In addition, front edge portions 34b1 of the forward heat dissipating fins 34b extending on the lower front side of the horizontal base plate 31a are brought into contact with a housing back side 42a of the mask mechanism solenoid 42. 40 to switch a light distribution disposed adjacent to the front of the heat sink 30, such that a chimney is formed in a front air passage S2 formed by the front heat dissipating fins 34b and s'. extending in the direction up and down. In this way, a circulating air convection T around the heat sink 30 becomes active. As a result, the light emitting element 22 and the lighting circuit unit 60 are more efficiently cooled.
The circulating air convection T formed around the heat sink 30 is described below.
A lower air passage SI extending in the front-rear direction is formed on the lower side of the horizontal base plate 31a by the lower heat dissipating fins 34a adjacent to each other in the left-right direction (width direction). The upstream and downward upwardly extending front air passage S2 is formed on the lower front side of the horizontal base plate 31a by the front heat dissipating fins 34b adjacent to each other. other in the left-right direction (width direction). An upward and downward rearwardly extending S3 air passage is formed on the rear side of the horizontal base plate 31a (the rear side of the vertical base plate 31b) by the dissipation fins. 34c adjacent to each other in the left-right direction (width direction). The front air passage S2 then communicates with the rear air passage S3 through the lower air passage SI below the horizontal base plate 31a. That is, the air passages S (S1, S2, S3) extending in the front-to-back direction and having a substantially L-shaped shape in a side view are formed between the heat sink vanes. heat 34 (34a, 34b, 34c, or 34d) extending from the underside of the horizontal base plate 31a to the front side of the horizontal base plate 31a and to the rear side of the vertical base plate 31b. The heat dissipating fins 34 (34a, 34b, 34c, or 34d) are adjacent to each other in the left-right direction (width direction) and have a substantially L shape in a side view.
Then, by providing the horizontal base plate 31a of the heat sink 30 to be tilted backwards, first, the movement (transfer) of heat to the front side of the heat sink 30 (horizontal base plate 31a) is favored. Secondly, when the air in the lower air passage SI, which is heated by drawing heat from the front heat dissipating fins 34b, rises along the bottom surface of the horizontal base plate 31a inclined towards the rear, the forward airflow is generated in the lower air passage SI. In this manner, as indicated by the arrow in Fig. 2, the circulating air convection T is formed around the heat sink 30. The air convection T rotates vertically forward-upwardly and the rear-down in the path of the lower air passage SI - »front air passage S2 -► above reflector 24 -> rear air passage S3 -> lower air passage SI. As a result, the light emitting element 22 and the lighting circuit unit 60 are effectively cooled.
Moreover, the flow of air flowing upward in the front air passage S2 is accelerated by the chimney effect of the front air passage S2 formed by the fins of heat dissipation. prior to 34b of the heat sink 30. In this manner, the circulating air convection T formed around the heat sink 30 becomes active. As a result, the light emitting element 22 and the lighting circuit unit 60 are effectively cooled down.
More particularly, the lighting circuit unit 60 is disposed below the horizontal base plate 31a of the heat sink 30. As shown in FIGS. 2 and 4, the lighting circuit unit 60 is disposed near the rear side of the lower heat dissipating fins 34a, and the lower portion between the lower air passage SI and the front air passage S2 is open. Therefore, fresh air under the heat sink 30 is admitted into the front air passage S2 through a lower opening portion S4 of the front air passage S2, so that the chimney effect of the S2 front air passage is further improved. That is, the upwardly flowing air flow in the front air passage S2 is further accelerated, and a circulating air convection T1 (see Fig. 2) is thus formed. The circulating air convection Tl rotates vertically in the path of the lower air opening passage S4 -► front air passage S2 -> above the reflector 24 -> rear air passage S3 - > · Below the lighting circuit unit 60 - + lower opening part S4.
As a result, the circulating air convection formed around the heat sink 30 and rotating vertically forward-upward and backward-downward becomes more active. As a result, the light emitting element 22 and the lighting circuit unit 60 are more efficiently cooled.
In addition, as shown in FIGS. 3 and 6, the vertical base plate 31b of the heat sink 30 is formed in a substantially circular arc shape in a plan view surrounding the emission element of FIG. 22. The rear heat-dissipating fins 34c, 34d extending on the rear side of the vertical base plate 31b extend downward and are continuous with the lower heat-dissipating fins 34a. In addition, as shown in FIGS. 4 and 5, the heat dissipating fins 34c formed near the central portion in the width direction on the rear side of the vertical base plate 31b extend rearwardly. at equal intervals in the left-right direction, and the heat-dissipating fins 34d formed near both sides in the width direction on the rear side of the vertical base plate 31b extend in the radial direction with respect to the light emission element 22. Thus, the protruding ends of the heat dissipating fins 34c, 34d are arranged along a substantially circular arc shape in a plan view to follow a shape substantially in a circular arc. in a plan view of the vertical base plate 31b.
Therefore, since the distances from the light emitting element 22 to the protruding ends of the respective heat dissipating fins 34c, 34d are substantially the same, the amount of heat transferred by the heat dissipating fins respectively 34c, 34d and the amount of heat dissipated from the respective heat dissipating fins 34c, 34d in the air are uniformly distributed, and thus, the heat dissipating effect to the back side of the heat sink 20 is improved.
In particular, spaces between the heat dissipating fins 34d, 34d adjacent to each other in the circumferential direction are enlarged towards the protruding ends of the heat dissipating fins 34d, and the airflow in a Rear air passage S3 '(see Fig. 3) formed between adjacent heat dissipating fins 34d, 34d and extending in the upward and downward direction is thereby smoothly increased. As a result, the heat dissipation effect to the back side of the heat sink 30 is also increased.
In addition, the heat dissipating fins 34e extending rearwardly from the vertical base plate 31b and having a short extension length are provided between the adjacent heat dissipating fins 34d, 34d. to one another in the circumferential direction, and the heat-dissipating surface on the rear side of the vertical base plate 31b is thus increased. In this manner, the heat dissipation effect to the back side of the heat sink 30 is also increased.
In addition, since the protruding rear ends of the heat dissipating fins 34d are disposed along a substantially circular arc shape in a plan view to follow a substantially circular arc shape in a plan view. of the vertical base plate 31b, the rear shape of the heat sink 30, i.e., the back shape of the light source unit 20, is formed in a substantially arcuate shape in a plan view. plane surrounding the light emitting element 22. Therefore, a tilting radius of the light source unit 20 is reduced when a setting operation of the light source unit 20 is performed. Correspondingly, the light source unit hardly interferes with the headlight body 12 or other fire element disposed near the light source unit 20 in the headlight chamber.
Figures 7 and 8 show an automobile headlight according to a second embodiment of the present invention. Figure 7 is a longitudinal sectional view of the automobile headlight, and Figure 8 is a perspective view of a heat sink integrated with the light source unit which is a main part of the headlight.
In the headlamp 10 according to the first embodiment described above, the base 32 for fixing the light-emitting element is provided on the central portion of the upper surface of the horizontal base plate 31a of the heat sink 30, and the element mounting surface 32a of the base 32 is configured by a surface parallel to the upper and lower surfaces of the horizontal base plate 31a. Therefore, the horizontal base plate 31a is disposed in the headlight chamber to be inclined rearwardly of the predetermined angle Θ with respect to the horizontal, so that the irradiation axis of the element light emission 22 fixed on the base 32 is inclined rearward of the predetermined angle Θ (predetermined angle corresponding to the rear inclination angle of the horizontal base plate 31a).
On the other hand, in a headlight 10A according to the present embodiment, in the case where the horizontal base plate 31a of a heat sink 30A is disposed in the headlight chamber to be tilted backwards. the predetermined angle Θ with respect to the horizontal, an element mounting surface 32a 'of a base 32' for fixing the light-emitting element is horizontal, and the irradiation axis of the light emitting element 22 fixed on the base 32 'is thus vertical.
In addition, in the headlamp 10 according to the first embodiment described above, the front edge portions 34b1 of the front heat sink fins 34b of the heat sink 30 are brought into contact with the rear housing side 42a. the electromagnet 42 of the movable mask mechanism 40 for switching a light distribution disposed adjacent the front of the heat sink 30, such that a chimney is formed in the front air passage S2 of the heat sink 30. On the contrary, in the headlight 10A according to the present embodiment, a vertical wall 31d which intersects the lower front side of the horizontal base plate 31a in the left-right direction is formed integrally with the parts of the front edge of the heat dissipating fins before 34b of the heat sink 30A, so that a chimney is formed in the front air passage S2 formed by the heat sink fins heat before 34b.
In addition, since the rigidity of the fins of heat dissipation 34 (fins of heat dissipation before 34b) can be provided by the vertical wall 31d provided on the front edge side of the heat dissipating fins before 34d, the Inclined vertical wall 31c (see FIGS. 2, 4 and 6) provided in the first embodiment is omitted.
Therefore, as shown in Figure 7, a lower opening portion S4 'of the front air passage S2 is largely open, as compared to the case of the first embodiment described above. Fresh air under the heat sink 30 is further drawn into the front air passage S2 through the lower opening portion S4 '. Thus, the chimney effect of the front air passage S2 is further improved, compared to the case of the first embodiment. That is, the flow of air flowing upward into the front air passage S2 is further accelerated, so that a circulating air convection Tl '(see FIG. Figure 7) becomes more active. The circulating air convection Tl 'rotates vertically in the path of the lower opening part S4' - * the front air passage S2 -> above the reflector 24 -> the rear air passage S3 -► below the lighting circuit unit 60 - ♦ the lower opening portion S4 '. In this way, the light emitting element 22 and the lighting circuit unit 60 are more efficiently cooled, compared to the case of the first embodiment.
Since the other parts are the same as those of the first embodiment and are designated by the same references, a repeated explanation thereof is omitted.
In addition, in the first and second embodiments described above, the adjustment mechanism E allows the light source unit 20 to be inclined around the horizontal inclination axis Lx and the vertical inclination axis LY, respectively. For example, the light source unit 20 can be tilted in the horizontal direction about a pivot axis by a pivoting mechanism and the optical axis L of the light source unit 20 can be rotate in the left-right direction at the same time as turning a steering wheel.
In addition, in the first and second embodiments described above, the heat sink 30, 30A are arranged such that the horizontal base plate 31a is inclined rearward, and the air convection circulating T vertically forward-up and back-down in the path of the lower air passage SI -► front air passage S2 -► above reflector 24 -> rear air passage S3 - + lower air passage SI is thus formed around heat sinks 30, 30A. In this way, the heat dissipating effect of the heat sinks 30, 30A is improved. However, the heat sinks 30, 30A may be arranged such that the horizontal base plate 31a is tilted forward, and a circulating air convection which rotates vertically backward-upward and toward the rear. Forward-down can thus be formed around heat sinks 30, 30A. In this way, the heat dissipating effect of the heat sinks 30, 30A can be improved, and the light emitting element 22 and the lighting circuit unit 60 can be effectively cooled.
That is, by arranging the horizontal base plate 31a to be inclined forwardly, first, the heat movement to the back side of the heat sink 30 (horizontal base plate 31a) is favored. Secondly, when the heated air in the lower air passage SI rises along the lower surface of the horizontal inclined front base plate 31a, the rearward airflow is generated in the passageway lower air SI. In this manner, a circulating air convection in which the direction of rotation is opposite to that of the circulating air convection T formed in the first and second embodiments is formed around the heat sink 30. ie the circulating air convection rotates vertically backwards-upwards and forwards-downwards in the path of the lower air passage SI -> rear air passage S3 - * above reflector 22 -> front air passage S2 - »lower air passage SI.
In addition, in the headlights 10, 10A according to the first and second embodiments described above, the base plate 31 of the heat sinks 30, 30A.is formed in the longitudinal section L-shaped comprising the plate horizontal base 31a and the vertical base plate 31b. However, the base plate 31 of the heat sinks 30, 30A may consist of only the horizontal base plate 31a without including the vertical base plate 31b.
That is, the heat dissipating fins 34 extending on the underside of the horizontal base plate 31a are formed in a substantially L-shaped shape in a side view extending into the front-rear direction beyond the horizontal base plate 31a. More specifically, the lower heat dissipating fins 34a are in the continuity of the front heat dissipating fins 34b extending substantially in the vertical direction to the lower front side of the horizontal base plate 31a and are also in continuity rear heat dissipating fins 34c, 34d extending substantially in the vertical direction toward the rear side of the horizontal base plate 31a in the upward and downward direction. In this manner, the heat sink fins 34 are formed in a plate form in which the front heat dissipating fins 34b, the lower heat dissipating fins 34a and the rear heat dissipating fins 34c (34d) are continuous in one piece.
In addition, in the embodiments above, the headlights 10, 10A in which the light source unit 20 is disposed in the headlight chamber and the light source unit 20 for the headlights are illustrated. However, the light source unit 20 may be used for a lighting device and lighting equipment such as a blinker, a ceiling light, a reading lamp, a search light and a projector. At this time, it is also possible to irradiate light through the projection lens 50 without providing the reflector 24. In addition, instead of the reflector 24, a light guide lens or an optical fiber can be adopted.

权利要求:
Claims (5)
[1" id="c-fr-0001]
A vehicle headlight comprising: a headlight chamber defined by assembling a front cover (14) at a front opening portion of a receptacle-shaped headlight body (12); a light source unit (20) configured such that a light emitting element (22), which is a light source, and a reflector (24), configured to reflect light emitted by the element light emission (22) to a front of the headlight chamber, are integrally mounted on an upper surface of a metal base plate (31) constituting a heat sink (30) in cooperation with a plurality heat sink fins (34) extending from a bottom surface of the base plate (31), the light source unit (20) being disposed in the headlight chamber, the heat dissipating fins (34) being arranged in parallel in a left-right direction of the base plate (31) and being formed in a substantially L-shaped shape in a side view, extending in a front-to-back direction from a front side of the base plate (31) to an upper side ar of the base plate (31).
[2" id="c-fr-0002]
The vehicle headlamp of claim 1, wherein the base plate (31) is configured to be inclined forward or backward.
[3" id="c-fr-0003]
A vehicle headlight according to claim 2, wherein the base plate (31) of the heat sink (30) is configured to be inclined rearward, front edge portions of the heat sink fins (34) are extending on the front side of the base plate (31) are configured to be brought into contact with another component of the light source unit (20) disposed adjacent a front of the heat sink (30). ) or are configured to be integrated with a vertical wall extending in the left-right direction, and a chimney being provided in an air passage constituted by the heat-dissipating fins (34) extending on the front side of the base plate (31).
[4" id="c-fr-0004]
A vehicle headlight according to any one of claims 1 to 3, wherein the base plate (31) is formed in an L-shaped longitudinal section, a vertical rod-shaped portion of the longitudinal section in the form of a L of the base plate (31) is formed in a substantially arcuate shape surrounding the light-emitting element (22) in a plan view, among the plurality of heat-dissipating fins (34) extending rearwardly from a rear side of the vertical rod-shaped portion of the L-shaped longitudinal section of the base plate (31), at least the heat dissipating fins (34) closer to the two sides in a width direction of the base plate (31) extend in a radial direction with respect to the light-emitting element (22), and protruding ends of the plurality of cooling fins heat (34) are provided along a substantially in an arc in a plan view to follow a substantially arcuate shape, in a plan view, of the vertical rod-shaped portion of the L-shaped longitudinal section of the base plate (31).
[5" id="c-fr-0005]
A light source unit in which a light-emitting element (22), which is a light source, is mounted on an upper surface of a metal base plate (31) constituting a heat sink (30). ) in cooperation with a plurality of heat dissipating fins (34) extending from a lower surface of the base plate (31), wherein the heat dissipating fins (34) are arranged in parallel in a predetermined direction of the base plate (31) and are formed in a substantially L shape in a side view, extending beyond the base plate (31) in a direction perpendicular to an arrangement direction.

类似技术:

公开号 | 公开日 | 专利标题

FR3053101B1|2019-07-05|VEHICLE HEADLIGHT AND LIGHT SOURCE UNIT

FR3051243B1|2019-10-25|VEHICLE FIRE

CA2810385C|2018-04-10|Optical module of an illuminating and/or signalling device of a motor vehicle

FR2863343A1|2005-06-10|HEADLIGHT WITH SEVERAL PHOTOEMISSIVE ELEMENTS

CA2810700C|2017-01-17|Optical module of an illuminating and/or signalling device of a motor vehicle

FR2853717A1|2004-10-15|VEHICLE HEADLIGHT AND APPARATUS FOR LIGHTING CIRCUIT

EP2199669B1|2013-04-24|Optical module cooling device for automobile headlight

FR2890151A1|2007-03-02|Headlamp for vehicle, has reflecting face of addition reflector divided into multiple reflecting portions, where surface shape of each reflecting portion is formed into ellipsoid of revolution in vertical direction

EP3076070A1|2016-10-05|Light module for motor vehicle headlight

FR2889290A1|2007-02-02|Vehicle headlamp for forming low-beam light distribution pattern, has light source units each with resin shade fastened to metal bracket by fastening screw, where shade has rear end part made of metal and fastening shade to bracket

FR2889291A1|2007-02-02|Vehicle lamp e.g. headlamp, for forming low-beam distribution pattern, has metal bracket tiltably supported by lamp body with heat sink, where heat sink and bracket are connected by flexible heat pipe with high thermal conductivity

FR2858043A1|2005-01-28|Light e.g. headlight for vehicle e.g. automobile, has semiconductor light emitting unit to emit light from fixed lighting region and support unit to adjust center of region on fixed position with respect to reference unit

FR2858044A1|2005-01-28|Light e.g. headlight, for e.g. automobile, has photo-emissive unit to emit light from region having linear limit, and lens to project shape of light region for forming line of cut that forms limit between bright and dark regions

FR2861833A1|2005-05-06|HEADLAMP WITH MULTIPLE LAMPS

EP3222910B1|2021-04-28|Optical module for lighting and/or signalling device of a motor vehicle

EP2187121A1|2010-05-19|Single-piece heat sink for optical modules of a lighting and/or signalling device for an automobile

FR2934668A1|2010-02-05|LUMINOUS MODULE OF A LIGHTING SYSTEM FOR A MOTOR VEHICLE

FR2920516A1|2009-03-06|Headlight for vehicle, has LED arranged on substrate of light source module, and driving unit rotating heat sink in horizontal direction, where light emitting surface of LED is displaced on focusing surface of lens during rotation of sink

FR2868511A1|2005-10-07|HEADLAMP WITH DECOUPLED BULB

FR3032778A1|2016-08-19|VEHICLE FIRE

FR3060710A1|2018-06-22|TRAFFIC LIGHT

FR3069906A1|2019-02-08|AUTOMOBILE HEADLIGHT

FR2663716A1|1991-12-27|HEADLIGHT FOR PROJECTOR TYPE VEHICLE.

FR2964723A1|2012-03-16|Optical module for lighting and signaling device such as headlight type lighting device, of motor vehicle, has reflectors that are formed on part equipped with cooling opening for circulation of cooling air

WO2016066915A1|2016-05-06|Vehicle headlamp

同族专利:

公开号 | 公开日

US10288243B2|2019-05-14|

JP6770347B2|2020-10-14|

JP2018005980A|2018-01-11|

DE102017210708A1|2017-12-28|

FR3053101B1|2019-07-05|

US20170370543A1|2017-12-28|

CN107543116A|2018-01-05|

CN107543116B|2020-06-30|

引用文献:

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

JP4771723B2|2005-03-24|2011-09-14|市光工業株式会社|Vehicle lighting|

JP4926771B2|2007-03-15|2012-05-09|株式会社小糸製作所|Vehicle lamp unit|

JP5026901B2|2007-09-21|2012-09-19|スタンレー電気株式会社|Lamp|

JP2009212019A|2008-03-06|2009-09-17|Stanley Electric Co Ltd|Vehicular headlight|

JP2009217937A|2008-03-06|2009-09-24|Stanley Electric Co Ltd|Vehicle headlamp|

JP5288943B2|2008-08-21|2013-09-11|株式会社小糸製作所|Vehicle lamp unit|

JP2010080075A|2008-09-24|2010-04-08|Ichikoh Ind Ltd|Lighting fixture for vehicle|

JP5321048B2|2008-12-26|2013-10-23|市光工業株式会社|Vehicle headlamp|

JP2010238605A|2009-03-31|2010-10-21|Koito Mfg Co Ltd|Lighting fixture unit|

JP2011222232A|2010-04-07|2011-11-04|Stanley Electric Co Ltd|Vehicle light|

JP5204180B2|2010-09-08|2013-06-05|株式会社日本自動車部品総合研究所|Vehicle headlamp|

JP2012204168A|2011-03-25|2012-10-22|Toyoda Gosei Co Ltd|Vehicular headlight|

JP2013062068A|2011-09-12|2013-04-04|Denso Corp|Lamp fitting for vehicle|

AT513123A1|2012-07-11|2014-01-15|Zizala Lichtsysteme Gmbh|Lighting device for a motor vehicle, headlight and headlight system|

FR2998944B1|2012-11-30|2019-06-28|Valeo Illuminacion|LIGHTING AND / OR SIGNALING DEVICE FOR MOTOR VEHICLE|

FR3001027B1|2013-01-15|2015-03-20|Valeo Vision|LIGHTING MODULE AND METHOD FOR MOUNTING SUCH A MODULE|

WO2014115875A1|2013-01-28|2014-07-31|株式会社小糸製作所|Vehicle lighting unit, and vehicle headlight|

JP6147510B2|2013-01-28|2017-06-14|株式会社小糸製作所|Vehicle headlamp|

AT514403B1|2013-05-29|2015-06-15|Zizala Lichtsysteme Gmbh|Lighting device for a vehicle headlight and vehicle headlights|

CN104515049A|2013-09-27|2015-04-15|株式会社小糸制作所|Railway vehicle headlamp|

JP2015167072A|2014-03-03|2015-09-24|市光工業株式会社|Vehicular lighting fixture and manufacturing method for heat sink|

DE102016103225A1|2015-03-11|2016-09-15|Panasonic Intellectual Property Management Co., Ltd.|Lighting device and mobile object containing the same|

CN107429892B|2015-03-31|2020-09-01|亮锐控股有限公司|LED lighting module with heat sink and method for replacing LED module|

JP6600209B2|2015-09-24|2019-10-30|スタンレー電気株式会社|Vehicle lighting|

CN105526572A|2016-01-29|2016-04-27|湖州巨力铝型材有限公司|Heat dissipation component of light-emitting diode lamp|

JP6774281B2|2016-09-21|2020-10-21|株式会社小糸製作所|Vehicle headlights|

CN206572389U|2017-03-14|2017-10-20|玉景科技股份有限公司|Modularization lens car lamp with nearly far lamp structure|JP6765241B2|2016-07-13|2020-10-07|株式会社小糸製作所|Lighting device for vehicles|

CN207364902U|2017-04-11|2018-05-15|法雷奥照明湖北技术中心有限公司|Light emitting module and the motor vehicles including the light emitting module|

FR3078141B1|2018-02-21|2020-08-14|Psa Automobiles Sa|VEHICLE OPTICAL BLOCK MOLDED PART, WITH ANTI-CONDENSATION OPENING REFLECTOR|

JP2020021665A|2018-08-02|2020-02-06|市光工業株式会社|Vehicle lamp fitting|

法律状态:
2018-05-07| PLFP| Fee payment|Year of fee payment: 2 |

2018-10-26| PLSC| Search report ready|Effective date: 20181026 |

2020-05-12| PLFP| Fee payment|Year of fee payment: 4 |

2021-05-13| PLFP| Fee payment|Year of fee payment: 5 |

优先权:

申请号 | 申请日 | 专利标题

JP2016126335A|JP6770347B2|2016-06-27|2016-06-27|Vehicle headlights|

JP2016126335|2016-06-27|

[返回顶部]