法国专利FR3051260A1 VEHICLE HEADLIGHT

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专利摘要:
A vehicle headlight comprises a plurality of excitation light sources; a fluorescent body (11); a scanning mechanism configured to scan by directing lights emitted from the excitation light sources to the fluorescent body (11); and a projection lens (14) through which lights emitted by the fluorescent body (11) pass such that a light distribution pattern is formed. Zones of irradiation of the lights emitted by the excitation light sources and incident on the fluorescent body (11) are different from each other.
公开号:FR3051260A1
申请号:FR1753936
申请日:2017-05-04
公开日:2017-11-17
发明作者:Noriko Sato
申请人:Koito Manufacturing Co Ltd；
IPC主号:

专利说明:

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The invention relates to a vehicle headlamp which makes it possible to carry out commands to obtain different light distribution configurations. 2. Description of the Prior Art [0002] Japanese Patent Application Publication No. 2014-65499 (JP 2014-65499 A) discloses a vehicle headlight in which lights emitted by a pair of laser devices serving as sources of light are reflected by a pair of micro electromechanical system (MEMS) mirrors, and a scan is performed with the lights to form a light distribution pattern. The MEMS mirrors are arranged to face the laser devices, respectively, and can be bi-dimensionally inclined.
SUMMARY OF THE INVENTION
In JP 2014-65499 A, since the laser devices are arranged to be symmetrical in an upper-lower direction, and the MEMS mirrors are arranged to be symmetrical in the upper-lower direction in the vehicle headlight, the areas of maximum incidence of the lights emitted by the upper and lower laser devices and incident on the fluorescent body through the upper and lower stationary MEMS mirrors are equal to each other. In a case where a plurality of lights is incident on the fluorescent body and light images of the lights on the fluorescent body have the same shape, flexibility may be insufficient to achieve controls for different light distribution patterns.
The invention provides a vehicle headlight that allows to achieve commands to obtain different light distribution configurations.
[0005] One aspect of the invention relates to a vehicle headlight comprising a plurality of excitation light sources; a fluorescent body; one or more scanning mechanism (s) configured to scan by directing lights emitted from the excitation light sources to the fluorescent body; and a projection lens through which the lights emitted by the fluorescent body pass such that a light distribution pattern is formed. Zones of irradiation of the lights emitted by the excitation light sources and incident on the fluorescent body are different from each other.
In the configuration described above, the shapes of the light images formed by the lights emitted by the excitation light sources and incident on the fluorescent body are different from each other.
In the aspect described above, a lens block can be provided between the excitation light sources and the scanning mechanism, the lens block comprising a plurality of light condensing portions arranged so as to cope with the excitation light sources, respectively; and the light condensing portions may have different light condensation magnifications from each other.
In the configuration described above, since the light condensation parts, through which the lights pass, have light condensation magnifications different from each other, light images having different shapes. from each other are formed by the lights emitted by the excitation light sources and incident on the fluorescent body.
In the aspect described above, a lens block can be provided between the excitation light sources and the scanning mechanism, the lens block comprising a plurality of light condensing portions arranged so as to cope with the excitation light sources, respectively; and the light-condensing portions and the excitation light sources may be arranged such that distances from the light-condensing portions to the excitation light sources facing the light-condensing portions, respectively, are different from each other.
The irradiation zone of the light on the fluorescent body is determined on the basis of a distance between each excitation light source and the light condensing portion facing the excitation light source, in other words a focal length of the light emitted by each light condensing part. Therefore, in the configuration described above, light images having different shapes from each other are formed by the lights emitted by the excitation light sources and incident on the fluorescent body.
In the aspect described above, each of the light condensing portions is configured to move relative to a corresponding one of the excitation light sources facing the light condensing portion so that that the distance from the light condensing portion to the corresponding one k of the excitation light sources is changed, or each of the excitation light sources is configured to move relative to a corresponding one of the light condensing portions facing the excitation light source such that the distance from the excitation light source to the corresponding one of the light condensing portions is changed.
In the configuration described above, by changing the distance between each of the excitation light sources and the corresponding light condensing portion facing the excitation light source, an incidence area of the incident light on the fluorescent body from the excitation light source is changed. The angles of incidence of the lights emitted by the excitation light sources and incident on the reflecting parts are typically different from each other.
In the aspect described above, the light-emitting portions of the excitation light sources may have different shapes from each other.
The irradiation zone of light on the fluorescent body is determined based on an emission region of the light-emitting portion of each excitation light source. Therefore, in the configuration described above, light images having different shapes from each other are formed by the lights emitted by the excitation light sources and incident on the fluorescent body.
In the vehicle headlight, light images having different shapes from each other are formed by the lights emitted by the excitation light sources and incident on the fluorescent body. This allows commands to be made to obtain different light distribution patterns.
In the vehicle headlight, it is possible to change the incident incidence of incident light on the fluorescent body from each of the excitation light sources. Therefore, it is possible to perform commands to obtain more different light distribution patterns.
BRIEF DESCRIPTION OF THE DRAWINGS
The characteristics, advantages and technical and industrial importance of exemplary embodiments of the invention will be described below with reference to the accompanying drawings, in which like references designate like elements, and in which:
Figure 1 is a front view of a vehicle headlight according to a first embodiment;
FIG. 2A is a cross-sectional view of the vehicle headlamp according to the first embodiment, which comprises a fluorescent light transmitting body, and FIG. 2B is an explanatory view of the optical paths in the vehicle headlight according to the first form. of achievement;
FIG. 3A is a cross-sectional view of a vehicle headlight according to a second embodiment, which comprises a fluorescent light transmitting body, and FIG. 3B is an explanatory view of the optical paths in the vehicle headlight according to FIG. second embodiment;
FIG. 4A is a perspective view of a scanning mechanism according to each of the first and second embodiments, viewed obliquely from the front side of a reflecting mirror, and FIG. 4B is an explanatory view of a configuration of FIG. road light light distribution formed by the vehicle headlight according to each of the first and second embodiments;
Fig. 5A is a partial cross-sectional view of a vehicle headlight according to a third embodiment and its optical paths, and Fig. 5B is a partial cross-sectional view of a vehicle headlight according to a fourth embodiment. and its optical paths;
Fig. 6A is a vertical sectional view of a vehicle headlight according to a fifth embodiment, and Fig. 6B is an explanatory view of the optical paths formed by the vehicle headlight according to the fifth embodiment, the optical paths being seen from the left side;
Fig. 7 is an explanatory view of the optical paths and light images formed by the vehicle headlight according to the fifth embodiment; and
Fig. 8A is a vertical sectional view of a vehicle headlight according to a sixth embodiment, and Fig. 8B is a view showing a modification of an excitation light source block according to the sixth embodiment.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Embodiments of the invention are explained below on the basis of FIGS. 1 to 8B. In these drawings, directions of a vehicle headlight (an upper direction, a lower direction, a left direction, a right direction, a front direction, and a rear direction) are indicated by Up, Down, Left, Right, Forward and Rear respectively.
A vehicle headlamp according to a first embodiment is explained with reference to Figure 1, Figure 2A and Figure 2B. The vehicle headlamp 1 according to the first embodiment comprises a transmission fluorescent body 11. FIG. 2A is a cross-sectional view of the vehicle headlamp according to the first embodiment, taken along line I-I in FIG. and FIG. 2B is a view of the optical paths formed by the vehicle headlight 1. The vehicle headlamp 1 according to the first embodiment is an example of a right-side headlight comprising a fluorescent light transmitting body, and comprises a fire body 2, a cover 3, and a fire unit 4. The fire body 2 has an opening on the front side of the vehicle, and the cover 3 is made of resin permitting light, made of glass or the like , and is fixed to cover the opening of the fire body 2. Thus, a fire chamber S is formed inside the fire body 2 and the cover 3. The headlight unit 4 shown in FIG. formed by integrating a unit 5 and a passing light headlight unit 6 to each other with the use of a support member 7 made of metal, and is disposed within the chamber of fire S.
Each of the traffic light headlight unit 5 and the low beam headlight unit 6 comprises a pair of excitation light sources (8a, 8b), a pair of condensers (9, 10), a fluorescent body 11, a pair of scanning mechanisms (12, 13), and a projection lens 14 in Fig. 2A, all of which are attached to the support member 7. The support member 7 comprises a plate-like lower plate portion 7a extending in the horizontal direction, a lens support portion 7d extending towards the front side from one end of the lower plate portion 7a, and a plate portion. plate-shaped base plate extending in the vertical direction from a base end of the lower plate portion.
The support member 7 shown in Figure 2A is made of metal, and includes the lower plate portion 7a, side plate portions (7b, 7c) integrated with a left end portion and a portion of the the right end of the lower plate portion 7a, a lens support portion 7d integrated at the distal ends of the side plate portions (7b, 7c), and the base plate portion 7e integrated at the base ends of the plate portions. lateral (7b, 7c). The lens supporting portion 7d is composed of a cylindrical portion 7d1 which holds the projection lens 14 on its inner side, and a flange portion 7d2 integral with the cylindrical portion 7dl and the side plate portions (7b, 7c). The base plate portion 7e consists of a screw fixing portion 7f, a heat dissipating portion 7g which is thicker in the front-to-back direction than the screw fixing portion 7f, and a rectangular column-shaped light source support portion 7h protruding toward the front side of the heat dissipating portion 7g.
The excitation light sources (8a, 8b) in FIG. 2A are attached to left and right side surfaces of the light source support portion 7h of the support member 7, respectively, of so that the rear sides of the excitation light sources (8a, 8b) face each other. In this case, as shown in FIG. 2B, light optical axes (B11, B12) from the excitation light sources (8a, 8b) on reflection surfaces of the scanning mechanisms (12, 13) become the same optical axis Lb in opposite directions to the left and right sides. The fluorescent body 11 is formed to have a plate shape and is fixed on an inner side of a base end portion of the cylindrical portion 7d1 so as to face the projection lens 14. The scanning mechanisms ( 12, 13) are fixed on a front surface of the heat dissipation portion 7g. The condensers (9, 10) are attached to the lower plate portion 7a or the base plate portion 7e. The projection lens 14 is attached to an inner side of a distal end portion of the cylindrical portion 7d1 of the lens support portion 7d. As shown in FIG. 2A, three adjusting screws 15, which are held by the fire body 2 to be rotatable, are screwed onto the screw fixing portion 7f of the base plate portion 7c. of the support element 7. Thus, the headlight unit 4 shown in FIG. 1 is supported so as to be inclined with respect to the body of fire 2.
The excitation light sources (8a, 8b) are constituted by light-emitting diode light sources or blue or violet laser light sources. While the excitation light sources (8a, 8b) are on, the heat of the excitation light sources (8a, 8b) is absorbed by the light source support portion 7h and the heat dissipation portion 7g . The condensers (9, 10) and the projection lens 14 are transparent or semi-transparent plano-convex lenses having convex light emitting surfaces.
The condenser 10 is formed to have the same outer diameter as the condenser 9 and also have a greater curvature than that of the condenser 9. Thus, the condenser 10 has a larger light condensation ratio than that of the condenser 9.
The condensers (9, 10) shown in FIG. 2A and FIG. 2B are fixed on the support element 7 so as to be arranged between the excitation light sources (8a, 8b) and the reflecting mirrors. (16, 16) scan mechanisms (12, 13), respectively. In other words, the condensers (9, 10) are arranged to face the excitation light sources (8a, 8b), respectively. The condensers (9, 10) condense the lights (B11, B12) from the excitation light sources (8a, 8b) and make them incident on the reflection surfaces (16a, 16a) of the reflecting mirrors (this is ie reflective parts) (16, 16), respectively. The light B12 condensed on the reflection surface 16a by the condensing lens 10 is condensed in a narrower zone than a zone of the light B11 which is condensed on the reflection surface 16a by the condenser 9, that is to say that is, the light B12 is condensed at a single point on the reflection surface 16a. Therefore, the light B12 reflected by the reflecting mirror 16 to the fluorescent body 11 is scattered more than the light B11 reflected by the reflecting mirror 16 to the fluorescent body 11. A light image represented on the fluorescent body 11 by the light B12 has a greater width Wdl than that of a point light image formed by the light B11.
The fluorescent body 11 is configured to generate white light. When the excitation light sources (8a, 8b) are blue, the fluorescent body 11 is formed as a yellow fluorescent body, and when the excitation light sources (8a, 8b) are purple, the fluorescent body 11 is formed as a yellow and blue fluorescent body or fluorescent body having at least three red, green and blue (RGB) colors.
The fluorescent body 11 shown in FIG. 2A and FIG. 2B transmits the reflected lights (B11, B12) having different irradiation zones towards the projection lens 14 like white lights (W11, W12), and furthermore, these lights pass through a front end opening 18a of an extension reflector 18 inside the fire chamber S, and the cover 3. A scan with the white lights (W11, W12) is performed by the scanning mechanisms (12, 13) to display white road light distribution patterns in front of a vehicle based on the sizes of the respective irradiation areas.
A vehicle headlamp 1 'according to a second embodiment is explained next with reference to Figure 3A and Figure 3B. The vehicle headlamp 1 'according to the second embodiment comprises a reflective fluorescent body 11'. FIG. 3A is a cross-sectional view of the vehicle headlamp 1 'according to the second embodiment, along the line I-I in FIG. 1, and FIG. 3B is a view of the optical paths formed by the vehicle headlight 1. '. A traffic light headlight unit 5 'of the vehicle headlamp 1' in FIG. 3B has the same structure as that of the vehicle headlamp 1 according to the first embodiment, except that a form of a support member 7 is different from that of the support member 7 in the first embodiment, and the arrangement is different from those of the excitation light sources (8a, 8b), the condensers (9, 10), the body fluorescent 11, and scanning mechanisms (12, 13). Excitation light sources (8a ', 8b'), condensers (9 ', 10'), a fluorescent body 11 ', and scanning mechanisms (12', 13 ') according to the second embodiment have the same structures as the excitation light sources (8a, 8b), the condensers (9, 10), the fluorescent body 11, and the scanning mechanisms (12, 13) according to the first embodiment, respectively.
As shown in Fig. 3A and Fig. 3B, a base plate portion 7e 'of the support member 7' in the second embodiment has a structure in which no source support portion of 7h light is provided in the base plate portion 7e of the support member 7 in the first embodiment, and consists of a screw fixing portion 7f 'and a heat dissipating portion 7g which is thicker in the forward-to-back direction than the screw fixing portion 7f '. Further, unlike the first embodiment, the fluorescent body 11 'according to the second embodiment is not attached to the lens support portion 7d' and is attached to the heat dissipation portion 7g 'of the support member 7 '. The excitation light sources (8a ', 8b') are attached to the heat sink portion 7g 'in a state where the excitation light sources (8a', 8b ') are disposed on the left side and the right side of the fluorescent body 11 ', respectively. While the excitation light sources (8a ', 8b') are on, the heat of the excitation light sources (8a ', 8b') is thus absorbed. In this case, optical axes (Le, Ld) of lights from the pair of excitation light sources (8a ', 8b') to the reflection surfaces of the scanning mechanisms (12 ', 13') are directed in the same direction, and are parallel to each other.
The scanning mechanisms (12 ', 13') according to the second embodiment in Figure 3A are not attached to the heat dissipating portion 7g ', and are attached to inner sides of the left side plate portions. and right (7b ', 7c'), respectively. The condensers (9 ', 10') are attached to the support member 7 'so as to be disposed between the excitation light sources (8a', 8b ') and the reflecting mirrors (16', 16 ') scanning mechanisms (12 ', 13'), respectively, and the fluorescent body 11 'is fixed on the support member 7' so as to face both the reflection surfaces (16a ', 16a') of the reflective mirrors (16 ', 16') and the projection lens 14 attached to the lens support portion 7d '.
The lights (B11 ', B12') emitted by the excitation light sources (8a ', 8b') and passing through the condensers (9 ', 10') in FIG. 3A and FIG. 3B are condensed on reflecting surfaces (16a ', 16a') of reflecting mirrors (16 ', 16'), and are scattered and reflected by reflection surfaces (16a ', 16a'), and lights (B11 ', B12) ') are then incident on the fluorescent body 11'. The condenser 10 'has a larger light condensation ratio than the condenser 9', and the light B12 'reflected to the fluorescent body 11' is incident on the fluorescent body 11 'in a state where the light B12' is scattered more than light Bll '. Therefore, a light image represented on the fluorescent body 11 'by the light B12' has a width Wdl 'greater than that of a point light image formed by the light B11'.
The fluorescent body 11 'in FIG. 3A and FIG. 3B reflect the lights (B11', B12 ') again towards the projection lens 14 like white lights (W11', W12 '), and the mechanisms of scan (12 ', 13') scan with the white lights (W11 ', W12') passing through the projection lens 14 and the cover 3 to display white road light distribution patterns in front of a vehicle based on the sizes of the irradiation areas. The pairs of excitation light sources in each of the first and second embodiments may be controlled to be turned on and off independently of each other by a lighting controller (not shown).
All scanning mechanisms (12, 13, 12 ', 13') according to the first and second embodiments shown in Figure 2A and Figure 3A have the same structure, and the reflecting mirror 16 and the surface of reflection 16a have the same structures as those of the reflecting mirror 16 'and the reflecting surface 16a', respectively. The scanning mechanism 12 shown in Fig. 4A is a scanning device having a reflecting mirror which can be tilted in two axes directions. In each of the scanning mechanisms according to the embodiments, a MEMS mirror is used as an example. However, as each of the scanning mechanisms, different scanning mechanisms, for example, a scanning mechanism comprising a galvano-mirror, can be used. The scanning mechanism 12 comprises the reflecting mirror 16, a base 17, a rotating body 19, a pair of first torsion bars 20, a pair of second torsion bars 21, a pair of permanent magnets 22, a pair permanent magnets 23, and a terminal portion 24. On a front surface of the reflecting mirror 16 is formed a reflecting surface 16a for example by a treatment such as silver plating and plating.
The base 17 supports the plate-shaped rotating body 19 so that the rotating body 19 is inclined by the pair of first torsion bars 20 in the right-left direction (i.e. to the right and left sides). The rotating body 19 supports the reflecting mirror 16 so that the reflecting mirror 16 is rotated by the pair of second torsion bars 21 in the upper-lower direction (i.e. towards the upper and lower sides) . The pair of permanent magnets 22 and the pair of permanent magnets 23 are provided in the base 17 in directions in which the pairs of first and second torsion bars (20, 21) extend, respectively. The reflecting mirror 16 and the rotating body 19 are provided with first and second coils (not shown), respectively, which are activated via the terminal portion 24. An excitation control for the first coil (not shown) ) and an excitation command for the second coil (not shown) are performed independently of each other by a control mechanism (not shown).
The rotation body 19 shown in FIG. 4A alternately tilts to the left and right sides around an axis of the first torsion bars 20 on the basis of a start or a stop. the excitation of the first coil (not shown). The reflecting mirror 16 (and 16 ') alternately tilts to the upper and lower sides about an axis of the second torsion bars 21 on the basis of a start or stop of the excitation of the second coil (not shown). The scanning is carried out in the right-left direction and the upper-lower direction with the lights (B11, B12, 3311 ', 3312') reflected by the reflecting surfaces 16a (and 16a ') towards the fluorescent body (11, 11 '), based on the inclination of the rotation body 19 in the right-left direction and the inclination of the reflection surfaces 16a (and 16a') in the upper-lower direction. As shown in FIG. 2B and FIG. 3B, the lumens (W11, W12, W11 ', W12'), which are transformed into white by passing through the fluorescent body 11 or being reflected by the fluorescent body 11 , pass through the projection lens 14 and the cover 3 while a scan is made in the right-left direction and the upper-lower direction. Thus, a white light distribution pattern in a given shape is shown in front of a vehicle based on a scan mode.
If reference is made to FIG. 4B, a description is provided of an example of a light distribution pattern represented in front of a vehicle by a scanning carried out by the traffic light headlight unit 5. The reference Pt1 indicates a light formed by the reflected lights (W11, W11 ') in Figure 2B and Figure 3B. The reference Pt2 indicates a light image which is formed by the reflected lights (W12, W12 ') to be larger than the Ptl light image. Within a rectangular scanning zone (reference Sel) in front of a vehicle, the scanning mechanisms (12, 13, 12 ', 13') first perform a scan from a left end SU to a S12 right end based on a tilt of the reflecting mirrors 16, tilt the reflecting mirrors 16 in a downward oblique direction and left to the next left end S13 which is slightly lower than the left end SU d a small distance d1, and then again scan to a right end S14, and the scanning mechanisms (12, 13, 12 ', 13') repeat this at high speed. The excitation light sources (8a, 8b, 8a ', 8b') are illuminated by a lighting control device (not shown) only in a position where the light distribution pattern is shown. More specifically, the excitation light sources (8a, 8b, 8a ', 8b') are ignited only in a section P2 to P3 where the light distribution pattern is shown, and are extinguished in a section of Pl to P2 and a section of P3 to P4, where the light distribution pattern is not shown. While the excitation light sources (8a, 8b, 8a ', 8b') are turned on and off in the given positions, the scanning mechanisms (12, 13, 12 ', 13') repeatedly perform scanning. described above at high speed, and have line images in the upper-lower direction, thus representing a traffic light distribution pattern in front of a vehicle. The low beam headlight unit 6 also performs a similar scan, thereby having a low beam light distribution pattern (not shown).
The excitation light sources (8a, 8b, 8a ', 8b') are configured to be turned on and off by the illumination controller independently of each other. In each of the vehicle headlights (1, 1 ') according to the first and second embodiments, in a case where only the excitation light source (8a or 8a') is on and a scan is performed with the image Ptl projector, a pattern configuration made by arranging white thin lines is shown in front of a vehicle (not shown). In a case where only the excitation light source (8b or 8b ') is on and a scan is performed with the Pt2 light image having a larger viewing area than that of the Ptl light image, a White stroke pattern made with thick white lines is shown in front of the vehicle. It is also possible to combine the white line patterns composed of thin lines and thick lines, which are formed by turning on the pair of excitation light sources (8a, 8b) or (8a ', 8b') simultaneously and in turn. performing a scan simultaneously. In all cases, commands for obtaining different light distribution configurations can be realized.
A vehicle headlamp 30 according to a third embodiment is then explained with reference to FIG. 5A. FIG. 5A is a cross-sectional view of a vehicle headlight 30 according to the third embodiment along the line I-I in FIG. 1. The vehicle headlight 30 and the vehicle headlamp 1 according to the first embodiment have a common structure with the exception of excitation light source structures (8a, 8b) and condensers (9, 10). The vehicle headlight 30 according to the third embodiment comprises excitation light sources (31, 32), and condensers (33, 34) having the same shape. A light emitting portion 32a of the excitation light source 32 is formed to be smaller than a light emitting portion 31a of the excitation light source 31. The excitation light sources pairs (31, 32) are affixed to left and right side surfaces of a light source support portion 7h of a support member 7, respectively, so that the rear sides of the excitation light sources (31, 32) face each other. The lights (B13, B14) emitted by the excitation light sources (31, 32) and incident on reflecting mirrors 16 are directed in the opposite directions towards the left and right sides along a common optical axis Le. Arrangement intervals among the excitation light source 31 disposed on the light source support portion 7h of the metal support member 7, the condenser 33, and the reflecting mirror 16 are the same as the arranging intervals among the excitation light source 32, the condenser 34, and the reflecting mirror 16.
In this case, as shown in FIG. 5A, the light B14 emitted by the excitation light source 32 and condensed on a reflection surface 16a by the condenser 34 is condensed in a narrower zone than a zone of the light B13 which is emitted by the excitation light source 31 and is condensed on the reflection surface 16a by the condenser 33. In other words, the light B14 is condensed at a point on the surface of reflection 16a. As a result, the reflected light B14 is diffused towards a fluorescent body wider than the reflected light B13, and a light image represented on the fluorescent body 11 by the reflected light B14 has a larger width Wd2 than that of a point light image formed by reflected light B13. The lights (B13, B14) are transformed into white lights (W13, W14) by passing through the fluorescent body 11, and white lights (W13, W14) pass through a projection lens 14 and a cover (not shown) .
In the vehicle headlamp 30, while the excitation light sources (31, 32) are switched on selectively or simultaneously, the reflecting mirrors (16, 16) of the scanning mechanisms (12, 13) are freely inclined. As in the case of the vehicle headlamp 1 according to the first embodiment, a scanning is carried out with the white lights (W13, W14) in the right-left direction repeatedly at high speed while a scan is shifted into the upper-lower direction of a given small gap in a rectangular scanning area (indicated by Sel) in front of a vehicle as shown in Figure 4B. Thus, white thin lines formed by light W13 and white thick lines formed by light W14 are provided, and thus, a white light distribution pattern in a given shape is shown in front of a vehicle (not shown). The light-emitting portions (31a, 32a) may be formed to have shapes in section (e.g., a circular shape, a quadrangular shape, and so on) different from each other.
A vehicle headlight 40 according to a fourth embodiment is then explained with reference to Figure 5B. FIG. 5B is a cross-sectional view of the vehicle headlamp 40 according to the fourth embodiment along the line I-I in FIG. 1, and the vehicle headlight 40 and the vehicle headlamp 1 according to the first embodiment have been a common structure with the exception of the structures of the support member 7, excitation light sources (8a, 8b) and condensers (9, 10). The vehicle headlamp 40 according to the fourth embodiment comprises excitation light sources (41, 42) having the same shape, condensers (43, 44) having the same shape, and a support member 45. support member 45 has the same structure as that of the support member 7 except in the form of a light source support portion 45h is different from that of the light source support portion 7h. The light source support portion 45h is formed to have a rectangular parallelepiped column shape, and has an inclined support surface 45b which is continuous with a left side surface 45a. The inclined support surface 45b is shaped to tilt relative to the left side surface 45a, and the excitation light source 41 is fixed to the inclined support surface 45b. The excitation light source 42 is attached to a right side surface 45c of the light source support portion 45h. An optical axis LF of a light B15 which is emitted by the excitation light source 41 and is incident on a reflecting mirror 16 is inclined with respect to an optical axis Lg of a light B16 of an angle Θ. The light B16 is emitted by the excitation light source 42 and is incident on a reflecting mirror 16.
As shown in FIG. 5B, an angle of incidence of the incident light B15 on a reflecting surface 16a of the reflecting mirror 16 is different from an incident angle of the incident light B16 on a surface of reflection 16a. Therefore, a light image, which is represented on reflection surface 16a by emitting light B15 from excitation light source 41 and condensing light B15 with the use of condenser 43, has a different form of light. that of a light image, which is represented on the reflection surface 16a of the reflecting mirror 16 by emitting the light B16 of the excitation light source 42 and condensing the light B16 with the use of the condenser 44. Specifically, a horizontal width of the light image represented on the reflection surface 16a by the light B16 is narrower than that of the light image represented on the reflection surface 16a by the light B15, and the reflected light. B16 is more scattered in the horizontal direction than the reflected light B15. As a result, the light image represented on the fluorescent body 11 by the reflected light B16 has a width Wd4 greater than a width Wd3 of the light image represented by the reflected light B15. The lights (B15, B16) are transformed into white lights (W15, W16) by passing through the fluorescent body 11 and the white lights (W15, W16) pass through a projection lens 14 and a cover (not shown) .
In the vehicle headlamp 40, while the excitation light sources (41, 42) are illuminated selectively or simultaneously, the reflecting mirrors (16, 16) of the scanning mechanisms (12, 13) are inclined freely. As in the case of the vehicle headlight 1 according to the first embodiment, a scanning is carried out with the white lights (W15, W16) in the right-left direction repeatedly at high speed while the scanning is shifted in the direction upper-lower of a given small range in a rectangular scanning area (indicated by Sel) in front of a vehicle as shown in Figure 4B. Thus, white thin lines formed by light W15 and white thick lines formed by light W16 are provided, and thus, a white light distribution pattern in a given shape is shown in front of a vehicle (not shown).
A vehicle headlight 50 according to a fifth embodiment is then explained with reference to Figure 6A and Figure 6B. Fig. 6A is a vertical sectional view of a vehicle headlight 50 according to the fifth embodiment along the line II-II in Fig. 1, and Fig. 6B is a view of the optical paths formed by the vehicle headlight 50. The feature of the vehicle headlight 50 is that the vehicle headlight 50 comprises a block of excitation light sources 55 comprising light-emitting portions (55a-55c) forming a plurality of excitation light sources, and a lens block 56 comprising a plurality of light condensing portions (56a-56c) having different light condensation ratios. The vehicle headlight 50 comprises a light body 51, and a high beam headlight unit 53 and a low beam headlight unit (not shown) having the same shape as that of the headlight unit of route 53, inside the fire chamber S towards the interior of a light transmission cover 52. The traffic light headlight unit 53 is fixed inside the fire chamber S with the low beam headlamp unit (not shown) via a support member 54 made of metal.
As shown in FIG. 6A, the main beam light unit 53 comprises the excitation light source block 55, the lens block 56, a fluorescent body 57, a scanning mechanism 58 , and a projection lens 59, which are attached to the support member 54. The support member 54 comprises a plate-like lower plate portion 54a extending in the horizontal direction, a lens support portion. in the form of a step 54b integrated at a distal end of the lower plate portion 54a by welding or the like, a plate-like base plate portion 54c extending in the vertical direction from a base end of the plate portion bottom 54a, and a frame body 54d protruding upwardly from the lower plate portion 54a. The base plate portion 54c consists of a screw fixing portion 54f and a holding portion 54g which is thicker in the front-to-back direction than the screw fixing portion 54f.
As shown in FIG. 6A and FIG. 6B, the excitation light source block 55 comprises a plurality of light-emitting portions serving as excitation light sources constituted by light sources. light-emitting diode or blue or violet laser light sources, and these light-emitting portions are a first light-emitting portion 55a, a second light-emitting portion 55b, and a third light-emitting portion 55c light arranged in the front-rear direction. All first to third light emitting portions (55a to 55c) have the same shape, and emit light upwardly. While the excitation light source block 55 is turned on, heat generated in the excitation light source block 55 is absorbed by the lower plate portion 54a of the metal support member 54.
As shown in FIG. 6A and FIG. 6B, the lens block 56 has a shape in which the first light-condensing portion 56a, the second light-condensing portion 56b, and the third condensation-condensing portion 56b. 56c light having plano-convex lens shapes with different thicknesses are arranged continuously in the front-rear direction. The first light condensing portion 56a, the second light condensing portion 56b and the third light condensing portion 56c are transparent or semi-transparent. When the curvatures of the first to third light condensing portions (56a to 56c) are Q1, Q2, Q3, and their light condensation ratios are Sbl, Sb2, Sb3, respectively, the lens block 56 is formed such that the curvatures of the first to third light condensing portions (56a to 56c) satisfy the relationship Q1 <Q2 <Q3. Thus, the light condensation ratios satisfy the relation Sbl <Sb2 <Sb3. The lens block 56 is attached to the lower plate portion 54a or the base plate portion 54c of the support member 54 in a state where the first to third light condensing portions (56a-56c) face the corresponding first to third light emission portions (55a to 55c), respectively.
As shown in Fig. 6A and Fig. 6B, a fluorescent body 57 is formed as a yellow fluorescent body when the excitation light source block 55 generates blue light, and the fluorescent body 57 is formed as a yellow and blue fluorescent body or a fluorescent body having at least three red, green and blue (RGB) colors when the excitation light source block 55 generates violet light. The fluorescent body 57 is attached to the frame body 54d of the support member 54. The scanning mechanism 58 has a structure similar to that of the scanning mechanism 12 according to the first embodiment, and comprises a reflecting mirror (c). that is, a reflective portion) 60 which is configured to freely tilt in the upper-lower direction as shown in FIG. 6A and in the right-left direction as shown in FIG. 7 The reflecting mirror 60 is arranged such that a reflection surface 60a faces both the lens block 56 and the fluorescent body 57. The projection lens 59 is a plano-convex lens which is convex in the direction before (that protrudes toward the front side), and is held by a horizontal holding portion 54e at a distal end of the lens holder portion 54b in a state where a The rear surface 59a faces the fluorescent body 57. The support element 54, in which the high beam headlight unit 53 and the low beam headlight unit (not shown) are mounted, is supported by the lamp body 51 by means of three adjustment screws 61 (one of which is not shown) so that the support member 54 can be freely inclined.
As shown in FIG. 6B, the first light condensing portion 56a, the second light condensing portion 56b, and the third light condensing portion 56c of the lens block 56 condense the lights (B17, B18, B19) emitted by the first light emitting portion 55a, the second light emitting portion 55b, and the third light emitting portion 55c of the excitation light source block 55, respectively, and make the lights (B17, B18, B19) incident on the reflecting surface 60a of the reflecting mirror 60. The light B19 condensed by the third light condensing portion 56c is condensed in a narrower area than a light area B18 condensed by the second light condensing portion 56b, and the B18 light condensed by the second light condensing portion 56b is condensed in the narrower zone than an area of the light. e B17 condensed by the first light condensing portion 56a. The lights (B17, B18, B19) incident on different positions on the reflection surface 60a are reflected towards the fluorescent body 57.
As a result, as shown in FIG. 6B and FIG. 7, the reflected light B19 towards the fluorescent body 57 is diffused more widely than the reflected light B18, and the reflected light B18 is diffused more widely than the reflected light B17. As a result, a height hd3 of a light image represented on the fluorescent body 57 by the light B19 is larger than a height hd2 of a light image represented on the fluorescent body 57 by the light B18, and the height hd2 of the light image represented on the fluorescent body 57 by the light B18 is greater than a height hdl of a light image represented on the fluorescent body 57 by the light B17.
In addition, as shown in FIG. 6A, FIG. 6B and FIG. 7, the lights (B17, B18, B19) are transformed into white lights (W17, W18, W19) by the fluorescent body 57, and the white lights (W17, W18, W19) pass through the projection lens 59 and the cover 52, and light images (Pt3, Pt4, Pt5) are thus represented in front of a vehicle (not shown). In this case, when widths and heights of the light images (Pt3, Pt4, Pt5) are Wd6, Wd7, Wd8 and hd6, hd7, hd8, respectively, the widths of the light images satisfy the relation Wd6 <Wd7 <Wd8 , and the heights of the light images satisfy the relation hd6 <hd7 <hd8. A scanning is carried out with the light images (Pt3, Pt4, Pt5) of the white lights (W17, W18, W19) which pass through the cover 52, in the upper-lower direction and the right-left direction, on the base the inclination of the reflecting mirror 60 in the upper-lower direction and the right-left direction in the scanning mechanism 58 as shown in Fig. 6A, Fig. 6B and Fig. 7.
A particular explanation is provided with reference to Figure 6B and Figure 7. In the vehicle headlight 50, while the first to third light emission portions (55a to 55c) of the source block of excitation light 55 shown in FIG. 6B are illuminated selectively or simultaneously, the reflecting mirror 60 is tilted at high speed from a left end position to the right side in a rectangular scan area Sc2 shown in FIG. 7 in front of a vehicle. Thus, white lines are drawn in the transverse direction on the basis of the heights (hd6, hd7, hd8) of the light images (Pt3, Pt4, Pt5). Then, while the excitation light source block 55 is off, the reflecting mirror 60 is tilted at high speed to a left end position which is shifted in the lower direction relative to the previous left end position of a given small interval. The excitation light source block 55 is then turned on again, and a scan is performed with the light images (Pt3, Pt4, Pt5) to the right side again at high speed. Repeating this, the white lines composed of the white lights (W17, W18, W19) are arranged, and thus, a white light distribution pattern in a given shape is shown in front of a vehicle (not shown).
A vehicle headlight 70 according to a sixth embodiment is then explained with reference to FIG. 8A. FIG. 8A is a vertical sectional view of the vehicle headlight 70 according to the sixth embodiment along the line II-II in FIG. 1. The vehicle headlight 70 and the vehicle headlight 50 according to the fifth embodiment have a common structure except that structures of an excitation light source block 71 and a lens block 72 are different from the structures of the excitation light source block 55 and the lens block 56 according to the fifth form of realization.
The characteristic of the vehicle headlight 70 in FIG. 8A is that the vehicle headlight 70 comprises a block of tread-like excitation light sources 71 in which the light-emitting portions (71a-71c) forming a plurality of excitation light sources are arranged at different heights, and a lens block 72 in which a plurality of light condensing portions (72a to 72c) having an equal light condensation ratio is disposed in one direction. before behind.
As shown in Fig. 8A, the excitation light source block 71 comprises the first to third light-emitting portions (71a-71c) having the same shape. The first to third light-emitting portions (71a to 71c) that form a plurality of excitation light sources are blue or violet light-emitting diode light sources or blue or violet laser light sources. The first to third parts of light emission. (71a to 71c) are mounted, for example, on flexible printed circuits (not shown) disposed along the upper surfaces of a support 71d. The support 71d is formed to have a step shape so that the heights (hh1, hh2, hh3) of the upper surfaces of the support 71d satisfy the relation hh1 <hh2 <hh3. The lens block 72 has a shape in which a first light-condensing portion 72a, a second light-condensing portion 72b, and a third light-condensing portion 72c are disposed continuously in the fore-aft direction. The first light condensing portion 72a, the second light condensing portion 72b, and the third light condensing portion 72c are transparent or semi-transparent, and have plano-convex lens shapes with a uniform thickness and the same curvature. The lens block 72 is attached to an element corresponding to the support member 54 according to the fifth embodiment, in a state where the first to third light condensing portions (72a to 72c) face the first to third portions corresponding light emission (71a to 71c), respectively.
As shown in FIG. 8A, the first to third light condensing portions (72a to 72c) of the lens block 72 condense the lumens (B20, B21, B22) emitted by the first to third portions of light emission (71a to 71c) from the excitation light source block 71, respectively, and make the lights (B20, B21, B22) incident on a reflection surface 60a of a reflecting mirror 60. Forward focal lengths first to third light condensing portions (72a to 72c) are proportional to distances to the light emitting portions (71a to 71c) facing the first to third light condensing portions (72a to 72c), respectively. Among distances from the light-emitting portions (71a-71c) to the light-condensing portions (72a-72c) facing the light-emitting portions (71a-71c), respectively, the distance up to at the first light-condensing portion 72a is the longest, and the distance to the third light-condensing portion 72c is the shortest. Therefore, light B22 condensed by the third light condensing portion 72c is condensed in a narrower zone than a zone of light B21 condensed by the second light condensing portion 72b, and light B21 condensed by the second light condensing portion 72b is condensed in the narrower zone than a zone of the B20 light condensed by the first light condensing portion 72a.
As shown in FIG. 8A, the lights (B20, B21, B22) incident in different positions on the reflection surface 60a are reflected towards the fluorescent body 57. The reflected light B22 towards the fluorescent body 57 is diffused more widely than the reflected light B21, and the reflected light B21 is scattered more widely than the reflected light B20. As a result, the heights (hd9, hd10, hdll) of the light images formed by the lights (B20, B21, B22) satisfy the relation hd9 <hd10 <hdll. The lights (B20, B21, B22) pass through a fluorescent body and are transformed into white lights (W20, W21, W22), and the white lights (W20, W21, W22) pass through a projection lens 59 and a lid (not shown). A scan is performed with the white lights (W20, W21, W22) in an upper-lower direction and a right-left direction based on an inclination of the reflecting mirror 60 of the scanning mechanism 58. Thus, a distribution pattern White light having a given shape is shown at the front of a vehicle (not shown).
In this embodiment, the first to third light-emitting portions (71a-71c) of the excitation light source block 71 are arranged such that the first to third light-emitting portions (71a to 71c) are displaced relative to each other in the upper-lower direction, and the first to third light-condensing portions (72a to 72c) of the lens block 72 are arranged in a line in the front-to-back direction. Thus, distances between the light-emitting portions and the light-condensing portions facing the light-emitting portions, respectively, are different from each other.
However, different distances can be provided by arranging the first to third light-emitting portions of the in-line excitation light source block in the forward-to-back direction, and arranging the first to third light-condensing light portion of the lens block such that the first to third light condensing portions are displaced relative to each other in the upper-lower direction.
FIG. 8B shows a block of excitation light sources 71 ', which is a modification of the excitation light source block 71 according to the sixth embodiment. The excitation light source block 71 'is configured such that plates (73a to 73c) can be moved in an upper-lower direction. First to third light emitting portions (71a 'to 71c') having the same shapes as those of the first to third light emitting portions (71a to 71c) are mounted on the plates (73a to 73c). The plates (73a-73c) are retained by slide rails (74a-74c), and displaced, for example, by a motor and a gear mechanism (both are not shown) in the upper-lower direction along slide rails (74a to 74c). A forward focal length of each of the first to third light condensing portions (72a-72c) becomes shorter and light scattering from the reflecting mirror to the fluorescent body becomes higher, when the corresponding one of the first to third light emitting portions (71a 'to 71c') is brought closer to the light condensing portion (72a to 72c) by moving the corresponding plate (73a to 73c). In this embodiment, instead of using the configuration where the plates (73a to 73c) on which the first to third light-emitting portions (71a 'to 71c') are mounted are movable in the upper-lower direction the first to third light condensing portions (72a to 72c) of the lens block 72 may be configured independently of each other, and the first to third light condensing portions (72a to 72c) may be retained by sliding rails, respectively, so as to slide in the upper-lower direction so that distances to the first to third light-emitting portions (71a 'to 71c') are changed.
In vehicle headlights according to the first to sixth embodiments, a low beam light source unit is provided in addition to the road light source light unit. However, a high beam light distribution pattern and a low beam light distribution pattern can be selectively or simultaneously represented by scanning across different areas using lights from light sources of a light beam. unique light source unit. In addition, in the first embodiment in the fourth embodiment, two excitation light sources and two condensers are provided, and in the fifth embodiment and the sixth embodiment, three light are provided in the block of excitation light sources and three lenses are provided in the lens block. However, the numbers of excitation light sources, condensers, light emitting portions in the excitation light source block, and light condensing portions in the lens block are not limited to numbers above.

权利要求:
Claims (9)
[1" id="c-fr-0001]
A vehicle headlight characterized in that it comprises: a plurality of excitation light sources; a fluorescent body (11; 11 '; 57); a scanning mechanism configured to scan by directing lights emitted from the excitation light sources to the fluorescent body (11; 11 '; 57); and a projection lens (14; 59) through which the lights emitted by the fluorescent body (11; 11 '; 57) pass so that a light distribution pattern is formed in which irradiation zones lights emitted by the excitation light sources and incident on the fluorescent body (11; 11 '; 57) are different from each other.
[2" id="c-fr-0002]
A vehicle headlight according to claim 1, wherein: a lens block (56) is provided between the excitation light sources and the scanning mechanism, the lens block (56) comprising a plurality of condensation portions light arranged to face the excitation light sources, respectively; and the light-condensing portions have different light-condensing magnitudes from one another.
[3" id="c-fr-0003]
A vehicle headlight according to claim 1, wherein: a lens block (72) is provided between the excitation light sources and the scanning mechanism, the lens block (72) comprising a plurality of condensation portions light arranged to face the excitation light sources, respectively; and the light-condensing portions and the excitation light sources are arranged such that the distances from the light-condensing portions to the excitation light sources facing the light-condensing portions, respectively , are different from each other.
[4" id="c-fr-0004]
A vehicle headlight according to claim 3, wherein: each of the light condensing portions is configured to move relative to a corresponding one of the excitation light sources facing the light condensing portion of such whereby the distance from the light condensing portion to the corresponding one of the excitation light sources is changed, or each of the excitation light sources is configured to move relative to a corresponding one of the light sources. light condensing portions facing the excitation light source such that the distance from the excitation light source to the corresponding one of the light condensing portions is changed.
[5" id="c-fr-0005]
A vehicle headlight according to any of claims 1 to 4, wherein the light-emitting portions (31a, 32a) of the excitation light sources have different shapes from each other.
[6" id="c-fr-0006]
The vehicle headlamp of claim 1, wherein the scanning mechanism comprises a reflecting portion (16; 16 '; 60) configured to reflect the lights emitted from the excitation light sources to the fluorescent body (11; 57).
[7" id="c-fr-0007]
A vehicle headlight according to claim 1, wherein a plurality of scanning mechanisms is provided, and each of the scanning mechanisms comprises a reflecting portion (16; 16 ') configured to reflect light emitted by a corresponding one of the sources. excitation light to the fluorescent body (11; 11 ').
[8" id="c-fr-0008]
A vehicle headlight according to claim 7, wherein: a plurality of condensers (9, 10; 9 ', 10') is provided such that each of the condensers (9, 10; 9 ', 10') faces to a corresponding one of the excitation light sources, and is disposed between a corresponding one of the excitation light sources and a corresponding one of the reflecting parts (16; 16 '); and the condensers (9, 10; 9 ', 10') have light condensation magnifications different from each other.
[9" id="c-fr-0009]
The vehicle headlamp of claim 7, wherein the angles of incidence of the lights emitted by the excitation light sources and incident on the reflective portions (16) are different from each other.

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法律状态:
2018-04-12| PLFP| Fee payment|Year of fee payment: 2 |

2020-04-14| PLFP| Fee payment|Year of fee payment: 4 |

2021-04-12| PLFP| Fee payment|Year of fee payment: 5 |

2021-06-11| PLSC| Search report ready|Effective date: 20210611 |

优先权:

申请号 | 申请日 | 专利标题

JP2016097391A|JP6782559B2|2016-05-13|2016-05-13|Vehicle headlights|

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