• 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 lamp (10, 110) has a projection lens (20) and a light source (30, 130) disposed at the rear of the projection lens (20). The vehicle lamp (10, 110) is configured to radiate forward the light of the light source (30, 130) through the projection lens (20). The projection lens (20) comprises a plurality of lenses (22, 34) disposed on an optical axis (Ax) extending in the longitudinal direction of the vehicle. The rear main surface (Pr) of the projection lens (20) forms a convex curved surface having a curvature greater than the curvature of a spherical surface (SI) centered on the rear focus (F) of the projection lens (20). ).
    公开号:FR3038362A1
    申请号:FR1656164
    申请日:2016-06-30
    公开日:2017-01-06
    发明作者:Takayuki Yagi
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    FIELD
    [0001]
    The present invention relates to a projector type vehicle lamp.
    BACKGROUND
    [0002]
    A projector type vehicle lamp is conventionally known which is configured to radiate forward through a projection lens the light of a light source disposed at the rear of the projection lens.
    [0003]
    In a vehicle lamp described in Patent Document 1, a projection lens comprises two lenses disposed on an optical axis extending in the longitudinal direction of the vehicle.
    [0004]
    Patent Document 1: Japanese Patent Open Publication No. 2014-26741.
    [0005]
    In a vehicle lamp such as a headlamp, it is desirable to form a light distribution pattern in which the light irregularity is as small as possible, as a light distribution pattern to be formed by the light. radiated.
    [0006]
    In a conventional projector type vehicle lamp, a plano-convex aspherical lens whose front surface forms a convex curved surface is often used as a projection lens. However, a significant coma aberration occurs in the projection lens having such a configuration. At this point, the coma aberration coma's tail extends inward (i.e., towards the optical axis) into an optical imaging system where light is incident on the projection lens from the front.
    On the other hand, when such a projection lens is used in a lighting optical system, a blur due to coma aberration occurs. The blur is formed in such a way that the coma tail extends outwardly from a light distribution pattern. Accordingly, a light distribution pattern to be formed by light radiated by a vehicle lamp having such a projection lens is formed such that the outer peripheral edge portion gradually becomes darker. As a result, the uniformity of the light distribution pattern can be improved.
    On the other hand, when the projection lens comprises a plurality of lenses, the thickness of each lens can be thinned. It is therefore possible to effectively suppress the appearance of surface depressions even when using a resin lens or the like.
    [0009] Even when the projection lens comprises a plurality of lenses, to improve the uniformity of the light distribution pattern, it is desirable to form the light distribution pattern in which the blur due to the coma aberration is produced in such a way that the coma tail extends outwardly from the light distribution pattern. SUMMARY [0010]
    The present invention has been realized in view of these situations and an object thereof is to provide a projector type vehicle lamp capable of forming a highly uniform light distribution pattern even when a projection lens comprises a plurality of lenses.
    [0011]
    The present invention is intended to achieve the above objective by imagining the arrangement of the rear main surface of a projection lens.
    [0012]
    Specifically, a vehicle lamp according to the present invention includes a projection lens and a light source disposed at the rear of the projection lens. The vehicle lamp is configured to radiate forward the light of the light source through the projection lens.
    The projection lens comprises a plurality of lenses disposed on an optical axis extending in the longitudinal direction of the vehicle.
    The rear main surface of the projection lens forms a convex curved surface having a curvature greater than the curvature of a spherical surface centered on the rear focus of the projection lens.
    [0013]
    The specific configuration of the vehicle lamp according to the present invention is not particularly limited. The vehicle lamp may for example be configured such that light from the light source is directly incident on the projection lens or configured such that light from the light source is incident on the projection lens after being reflected by a reflector.
    [0014]
    The type of "light source" is not particularly limited. A light emitting element such as for example a light emitting diode or a laser diode or a light source bulb or the like may be used.
    [0015]
    The specific configuration of each of the plurality of lenses constituting the "projection lens" is not particularly limited, since the rear major surface of the projection lens forms a convex curved surface having a curvature greater than that of the projection lens. a spherical surface centered on the rear focus of the projection lens.
    [0016]
    In the vehicle lamp according to the present invention, the projection lens comprises a plurality of lenses disposed on the optical axis extending in the longitudinal direction of the vehicle. As a result, the thickness of each lens can be thinned. In this way, it is possible to effectively suppress the appearance of surface depressions, even when using a resin lens or the like.
    [0017]
    In the present invention, the rear major surface of the projection lens forms a convex curved surface having a curvature greater than that of a spherical surface centered on the rear focus of the projection lens. The following effects can therefore be obtained.
    [0018]
    Specifically, when it is assumed that a parallel light is incident on the projection lens from the front, coma aberration occurs on an imaging plane and coma tail of the coma aberration extends inwards (towards the optical axis). On the other hand, a blur due to coma aberration occurs in a light distribution pattern to be formed by the light emitted by the projection lens. The blur is formed in such a way that the coma tail extends outwardly from the light distribution pattern. It is therefore possible to form a highly uniform light distribution pattern in which the outer peripheral edge portion gradually becomes darker.
    [0019]
    In this way, the projector type vehicle lamp according to the present invention is capable of forming a highly uniform light distribution pattern, even when the projection lens comprises a plurality of lenses.
    [0020]
    In the above configuration, the front surface of the lens located at the most forward lens of the plurality of lenses may be a convex curved surface, the curvature of the optical axis being set to a value lying within the range of 0.002 to 0.01 (1 / mm). In this way, the following effects can be achieved.
    [0021]
    Specifically, with respect to a projection lens comprising a single plano-convex aspherical lens as in the prior art, the curvature of the convex curved surface constituting the front surface of the projection lens can be significantly reduced and the front surface of the projection lens can be a convex curved surface, replacing a simple flat surface. As a result, the design of the projection lens can be improved when the vehicle lamp is viewed from the outside.
    [0022]
    The most forward lens forms a biconvex lens. In this case, despite the fact that the curvature of the front surface of the forwardmost lens is small, it is possible to easily recognize that the lens is not a simple transparent lens, but a convex lens, when we observe the vehicle lamp from the outside. In this way, the design of the projection lens can be further improved.
    [0023]
    In the above configuration, light reflection suppression processing may be performed on the respective surfaces of the plurality of lenses other than the front surface of the foremost lens and the rear surface of the lens located the most backward. In this case, even when the projection lens comprises a plurality of lenses, it is possible to effectively suppress the unexpected generation of stray light when light from the light source is transmitted through the projection lens.
    [0024]
    "Light reflection suppression treatment" is not limited to a specific treatment, as far as it is able to suppress light reflection. For example, an anti-reflection film forming treatment or a micro-asperity forming treatment may be used.
    [0025]
    In the above configuration, the lenses of the plurality of lenses may be supported by a common cylindrical support and then an opening may be formed in the peripheral surface portion of the cylindrical support. In this case, part of the plurality of lenses can be made visible through the aperture when the vehicle lamp is viewed from the outside. In this way, the design of the projection lens can be improved.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood and its advantages will be better understood on reading the detailed description which follows. The description refers to the following drawings, which are given by way of example.
    [0026]
    Fig. 1 is a sectional side view showing a vehicle lamp according to an embodiment of the present invention.
    FIG. 2 is a sectional view through the line II-II shown in FIG.
    FIG. 3 is a view showing in perspective a low beam light distribution pattern which is formed on a virtual vertical screen disposed in a position 25 meters in front of the vehicle lamp by means of the radiated light forwardly by the vehicle lamp.
    Fig. 4 is a sectional planar view showing separately a projection lens of the vehicle lamp.
    Fig. 5A is a sectional planar view showing a projection lens as a comparative example of the projection lens.
    Fig. 5B is a sectional planar view showing a projection lens as a comparative example of the projection lens.
    Fig. 6A1 is a view schematically showing a coma aberration that occurs in the projection lens of the above embodiment and in the projection lenses of the comparative example.
    Fig. 6A2 is a view schematically showing a blur of a light distribution pattern that occurs in the projection lens of the above embodiment and in the projection lenses of the comparative example.
    Fig. 6B1 is a view schematically showing a coma aberration that occurs in the projection lenses of the comparative example.
    Fig. 6B2 is a view schematically showing a blur of a light distribution pattern that occurs in the projection lenses of the comparative example.
    Fig. 7 is a view similar to Fig. 2, showing a modified example of the above embodiment.
    Fig. 8 is a perspective view showing a traffic light distribution pattern which is formed on the virtual vertical screen by means of the light radiated forwards by a vehicle lamp according to the modified example.
    DETAILED DESCRIPTION
    [0027]
    An embodiment of the present invention will be described hereinafter with reference to the drawings.
    [0028]
    Fig. 1 is a sectional side view showing a vehicle lamp according to an embodiment of the present invention. In addition, FIG. 2 is a sectional view through the line II-II shown in FIG.
    [0029]
    As shown in FIGS. 1 and 2, a vehicle lamp 10 according to the present embodiment is a dipped beam headlight disposed in the front end portion of a vehicle. The vehicle lamp is a projector type lamp unit included within a lamp chamber. The lamp chamber is defined by a lamp body (not shown) and a simple shaped transparent cover 12 attached to the front end opening of the lamp body.
    [0030]
    Specifically, the vehicle lamp 10 includes a projection lens 20 having an optical axis Ax extending in the longitudinal direction of the vehicle, a light emitting element 30 serving as a light source and disposed on the rear side of the rear focus. F of the projection lens 20, a reflector 40 arranged to cover the light-emitting element 30 from above and configured to reflect light from the light-emitting element 30 to the projection lens 20 and a light-emitting element base 50 having an upwardly reflective surface 50a for upwardly reflecting part of the light reflected by the reflector 40.
    On the other hand, the vehicle lamp 10 is configured so that the optical axis Ax is slightly lower with respect to the longitudinal direction of the vehicle in a state in which the adjustment of the optical axis is completed.
    [0032]
    The projection lens 20 comprises two lenses 22, 24, which are arranged on the optical axis Ax at intervals required in the longitudinal direction. These two lenses 22, 24, are configured so that their outer peripheral edge portions are supported by a common cylindrical support 26. The cylindrical support 26 is supported on the base member 50. On the other hand, specific configurations of the projection lens 20 and the cylindrical support 26 will be described below.
    The light emitting element 30 is a white light emitting diode and has a light emitting surface 30a. The light emitting surface 30a has an oblong rectangular shape and extends in the width direction of the vehicle. In addition, the light emitting element 30 is disposed in a state in which the light emitting surface 30a is upwardly facing the optical axis Ax. The light emitting element 30 is supported on the base element 50.
    [0034]
    The reflective surface 40a of the reflector 40 is formed by a substantially elliptical curved surface whose major axis is coaxial with the optical axis Ax and in which the light emitting center of the light emitting element 30 is the first focus of the reflecting surface 40a. The eccentricity of the reflecting surface 40a is set to gradually increase from a vertical section to a horizontal section. In this manner, the reflector 40 is configured so that the light from the light emitting element 30 converges towards a point slightly in front of the back focus F in vertical section and its convergence position is moved considerably forward in the horizontal section. The reflector 40 is supported on the base member 50.
    [0035]
    A mirror treatment by deposition of aluminum or the like is performed on the upper surface of the base member 50, thereby forming the upwardly reflective surface 50a of the base member 50. In the upwardly reflective surface 50a , the left-hand left-hand side (from the front of the vehicle) of the optical axis Ax is configured as a horizontal plane with the optical axis Ax and the right-hand region on the right side of the vehicle. the optical axis Ax is configured as a lower horizontal plane of a step than the left region, with a short inclined surface. The front end edge 50al of the upwardly reflective surface 50a extends so as to be curved both to the left and right sides and to the front side with respect to the back focus F. In addition, the reflecting surface 50a is formed as a zone in a range from the leading end edge 50a 1 to a position which is separated by a predetermined distance back from the leading end edge 50al.
    The base member 50 is configured such that a portion of the reflected light directed from the reflective surface 40a of the reflector 40 to the projection lens 20 is incident on the projection lens 20 by being reflected upwardly. on the upwardly reflective surface 50a and is then emitted as light downwards by the projection lens 20.
    [0037]
    Specific configurations of the projection lens 20 and the cylindrical support 26 are then described.
    [0038]
    The two lenses 22, 24 constituting the projection lens 20 have a biconvex lens shape.
    [0039]
    The front surface 22a of the forward-facing lens 22 forms a convex curved surface approaching a spherical surface having a large radius of curvature (which will be described below).
    [0040]
    The rear surface 22b of the lens 22 forms a convex curved surface where the curvature of the central region in the vicinity of the optical axis Ax is greater than that of the front surface 22a. The curvature gradually decreases toward the outer peripheral side from the central region and becomes substantially zero at the outer peripheral edge region.
    On the other hand, the front surface 24a of the lens 24 located on the rear side is configured in such a way that the central region in the vicinity of the optical axis Ax is shaped in substantially planar form, the outer peripheral side region. the central region forms a convex curved surface and the curvature again becomes substantially zero at the outer peripheral edge region.
    [0042]
    The rear surface 24b of the lens 24 is configured in such a way that the central region in the vicinity of the optical axis Ax forms a convex curved surface having substantially the same curvature as the front surface 22a of the lens 22 and the curvature increases gradually. the central region to the outer peripheral side.
    [0043]
    An anti-reflection film 28 is formed over the entire area of the rear surface 22b of the lens 22 and the front surface 24a of the lens 24.
    [0044]
    The cylindrical support 26 comprises a first support 26A for supporting the lens 22, a second support 26B for supporting the lens 24 at the rear of the first support 26A and a third support 26C attached to the first and second supports.
    [0045]
    The first support 26A abuts against the outer peripheral surface of the lens 22 and the outer peripheral edge portion of the rear surface 22b of the lens 22 and is also abutted against the outer peripheral edge portion of the front surface 24a of the the lens 24. In addition, the second support 26B abuts against the outer peripheral surface of the lens 24 and the outer peripheral edge portion of the rear surface 24b of the lens 24. The third support 26C is formed so as to cover the first support 26A. The front end portion of the third support 26C abuts against the outer peripheral edge portion of the front surface 22a of the lens 22 and its rear end portion is attached to the second support 26B.
    [0046]
    An opening 26a is formed on the upper side of the peripheral surface portion of the cylindrical support 26 between the lens 22 and the lens 24. The opening 26a is formed by means of the first and third supports 26A, 26, which are partially cut.
    [0047]
    FIG. 3 is a view showing in perspective a low beam light distribution pattern PL which is formed on a virtual vertical screen disposed in a position 25 meters in front of the vehicle by means of the light radiated forwards by the vehicle lamp 10.
    [0048]
    The crosslamp light distribution pattern PL is a crosslamp light distribution pattern of a left light pattern and has on its upper end edge cut lines CL1, CL2 having left and right levels. different right. The cutting lines CL1, CL2 extend in the horizontal direction so as to have different left and right levels with a V-V line as the limit. The V-V line passes vertically through H-V which is a vanishing point in the forward direction of the lamp. The right side of the V-V line, which corresponds to the side of the taxiway of a vehicle coming in the opposite direction, is formed as a lower cut line CL1. The left side of the V-V line, which corresponds to the vehicle-specific taxiway side, is formed as the upper cut line CL2. The upper cutting line CL2 is here raised in a stepwise manner with respect to the lower cutting line CL1 at a higher level via a sloping portion.
    [0049]
    An image of the light source of the light emitting element 30 is formed on the rear focal plane of the projection lens 20 by means of the light which is emitted by the light emitting element 30 and reflected in the reflector 40 The image of the light source of the light emitting element 30 is projected as an inverted image on the virtual vertical screen by means of the projection lens 20. In this way, the light distribution pattern passing beam PL is formed. In addition, the cut lines CL1, CL2 of the crosslamp light distribution pattern PL are formed as an inverted projection imager of the front end edge 50al of the upward reflecting surface 50a of the element basic 50.
    [0050]
    In the crosslamp light distribution pattern PL, a bend point E which constitutes the point of intersection of the lower cut line CL1 and the line VV is located downward with respect to HV of approximately 0 , 5 ° to 0.6 °. In addition, a hot zone HZL, which is a region of high light intensity is formed approximately around the point of elbow E.
    [0051]
    The low beam light distribution pattern PL is formed so that the brightness gradually decreases from the hot zone HZL to the outer peripheral side. However, since the crosslamp light distribution pattern PL is formed as an oblong light distribution pattern, a phenomenon such as gradual decrease in brightness especially at the two left and right end portions PLa of the crosslamp light distribution pattern PL appears in a remarkable way. In this way, it prevents the prior formation of a significant contrast on a road shoulder or the surface of a road in front of the vehicle. As a result, the uniformity of the light distribution pattern is improved and the visibility in front of the vehicle is sufficiently guaranteed.
    [0052]
    The reason why the crosslamp light distribution pattern PL is formed as a highly uniform light distribution pattern in this manner will be described hereinafter.
    [0053]
    FIG. 4 is a sectional planar view showing separately the projection lens 20.
    [0054]
    As shown in Fig. 4, the rear main surface Pr of the projection lens 20 forms a curved surface which is convex forwardly between the lens 22 and the lens 24. At this point, the rear major surface Pr forms a surface convex curvature having a curvature greater than that of a spherical surface SI centered on the rear focus F of the projection lens 20. That is to say that the spherical surface SI has a radius RI equal to the focal length of the projection lens 20. The rear main surface Pr forms a convex curved surface which is inscribed in the spherical surface SI on the optical axis Ax.
    [0055]
    The focal length of the projection lens 20 is set at a value of about 50 to 60 mm.
    [0056]
    The front surface 22a of the forward-facing lens 22 forms a convex curved surface approaching a spherical surface S2 whose radius of curvature R2 is set from 100 to 500 mm. Specifically, the convex curved surface constituting the front surface 22a has a curvature on the optical axis Ax, which is set at a value in the range of 0.002 to 0.01 (1 / mm). That is, the curvature of the front surface 22a is set at a considerably low value that is less than or equal to 2/3 (less than or equal to 1/2 of the maximum curvature of the rear main surface Pr) of the curvature of the spherical surface SI.
    [0057]
    Figs. 5A and 5B are sectional planar views showing two projection lenses 102, 104, as a comparative example of the projection lens 20 of the present embodiment.
    [0058]
    These two projection lenses 102, 104, are single lenses having the same focal length as the projection lens 20 of the present embodiment.
    [0059]
    Projection lens 102 shown in Figure 5A is a plano-convex aspherical lens which is often used as the projection lens of a conventional vehicle lamp. The front surface 102a of the projection lens 102 forms a convex curved surface and its rear surface 102b forms a flat surface.
    [0060]
    The rear main surface Pr1 of the projection lens 102 forms a curved surface which is convex forwards within the projection lens 102. In this case, similarly to the rear main surface Pr of the lens projection 20 of the present embodiment, the rear main surface Pr1 forms a convex curved surface having a curvature greater than that of the spherical surface SI centered on the rear focus F of the projection lens 102.
    On the other hand, the projection lens 104 shown in Figure 5B is a biconvex lens, the curvature of the front surface 104a being fixed to be substantially equal to that of the rear surface 20a of the projection lens 20 of the present embodiment, and the curvature of the rear surface 104b being set at a much larger value than that of the front surface 104a.
    Inside the projection lens 104, the rear main surface Pr2 of the projection lens 104 forms a curved surface which is convex forwards in a region close to the optical axis Ax but which it is varied to be convex backward in the outer peripheral edge region.
    [0063]
    Fig. 6 is a view schematically showing the relationship between the blur of a light distribution pattern and a coma aberration that occurs in the projection lens 20 of the present embodiment and the projection lenses 102, 104 of the example. comparative.
    [0064]
    Fig. 6A1 is a view showing, at five angles of incidence of light, the coma aberration that occurs in the projection lens 20 of the present embodiment and the projection lens 102 of the comparative example. Fig. 6B1 is a view showing, at five angles of incidence of light, the coma aberration that occurs in the projection lens 104 of the comparative example.
    [0065]
    As shown in FIG. 6A1, a coma aberration C1, which occurs in an image forming optical system where light is incident on the projection lenses 20, 102, from the front, is formed so that the tail of the coma extends inward (that is, towards the optical axis Ax). This is because each of the major rear surfaces Pr, Pr1 of the projection lenses 20, 102 forms a convex curved surface having a curvature greater than that of the spherical surface SI centered on the rear foci of the projection lenses.
    On the other hand, as shown in FIG. 6B1, a coma aberration C2, which occurs in an image forming optical system where light is incident on the projection lenses 104 from the front, is formed so that the tail of the coma extends outward.
    [0067]
    Further, as shown in Fig. 6A2, a blur B1 due to coma aberration occurs in a light distribution pattern formed by an illumination optical system where light is emitted forwardly from the lenses The blur B1 is formed such that the tail of the coma extends outwardly from the light distribution pattern.
    On the other hand, as shown in Fig. 6B2, a blur B2 due to coma aberration also occurs in a light distribution pattern formed by an illumination optical system where light is emitted to The blur B2 is formed so that the tail of the coma extends inwardly of the light distribution pattern.
    [0069]
    As a result, the light distribution pattern formed by the light emitted by the projection lens 104 is formed such that the outer peripheral edge portion becomes abruptly darker. In contrast, the light distribution pattern formed by the light emitted by the projection lenses 20, 102 is formed such that the outer peripheral edge portion gradually becomes darker.
    [0070]
    The effects of the present embodiment are then described.
    [0071]
    The vehicle lamp 10 according to the present embodiment has a configuration such that the projection lens 20 comprises two lenses 22, 24, arranged on the optical axis Ax extending in the longitudinal direction of the vehicle. The thickness of each lens 22, 24 can therefore be thinned. In this way, it is possible to effectively suppress the occurrence of surface depressions even when using a resin lens or the like for each lens 22, 24.
    [0072]
    Further, in the present embodiment, the rear main surface Pr of the projection lens 20 forms a convex curved surface having a curvature greater than that of the spherical surface SI centered on the rear focus F of the projection lens 20. As a result, the following effects can be achieved.
    [0073]
    Specifically, when it is assumed that parallel light is incident on the projection lens 20 from the front, the coma aberration C1 occurs in the imaging plane and the coma tail of the Coma aberration Cl extends inward (towards the Ax optical axis). On the other hand, the blur B1 due to coma aberration occurs in a light distribution pattern to be formed by the light emitted by the projection lens 20. The blur B1 is formed such that the tail coma extends outward from the light distribution pattern. As a result, the low beam light distribution pattern PL can be formed as a highly uniform light distribution pattern where the outer peripheral edge portion gradually becomes darker.
    [0074]
    In this manner, the projector type vehicle lamp 10 according to the present embodiment is capable of forming a highly uniform light distribution pattern, even when the projection lens 20 comprises two lenses 22, 24.
    At this moment, the front surface 22a of the lens 22 located at the front of the two lenses 22, 24 forms a convex curved surface, the curvature on the optical axis Ax being fixed at a value lying in the range ranging from 0.002 to 0.0 (1 / mm). The following effects can therefore be obtained.
    [0076]
    Specifically, with respect to the projection lens 102 comprising a single plano-convex aspherical lens as in the prior art, the curvature of the convex curved surface constituting the front surface 22a of the lens 22 can be significantly reduced and the front surface 22a may be a convex curved surface, replacing a simple flat surface. As a result, the design of the projection lens 20 can be improved when the vehicle lamp 10 is viewed from the outside.
    At this moment, the lens 22 forms a biconvex lens. Therefore, despite the fact that the curvature of the front surface 22a of the lens 22 is small, it is possible to easily recognize that the lens 22 is not a simple transparent lens, but a convex lens when observed. vehicle lamp 10 from the outside. In this way, the design of the projection lens 20 can be further improved.
    [0078]
    Further, in the present embodiment, a light reflection suppressing treatment by means of an anti-reflection film can be performed on the rear surface 22b of the lens 22 and the front surface 24a of the lens 24. Accordingly, despite the fact that the projection lens 20 comprises two lenses 22, 24, it is possible to effectively suppress the unexpected generation of stray light as the light from the light emitting element 30 is transmitted through the lens. projection 20.
    [0079]
    Further, in the present embodiment, the two lenses 22, 24, are supported by the common cylindrical support 26 and the opening 26a formed on the upper side of the peripheral surface portion of the cylindrical support 26 between the lens 22 and As a result, the lens 24 located on the rear side of the aperture 26a can be made visible through the aperture 26a when the vehicle lamp 10 is viewed from the outside through the transparent cover 12. In this way, the design of the projection lens 20 can be improved.
    [0080]
    In this case, the front surface 24a of the lens 24 is similar to the lens 22, by means of a convex curved surface where the curvature on the optical axis Ax is small, and its rear surface 24b forms a convex curved surface having a curvature greater than that of the front surface 24a. As a result, the design of the lens 24 viewed through the aperture 26a can be sufficiently improved.
    [0081]
    In the above embodiment, the opening 26a is formed on the upper side of the peripheral surface portion of the cylindrical support 26. However, the opening 26a may be formed on the side or the like of the peripheral surface portion cylindrical support 26.
    [0082]
    In the above embodiment, the projection lens 20 comprises two lenses 22, 24. However, the projection lens 20 may comprise three or more lenses.
    [0083]
    In the above embodiment, the vehicle lamp 10 is a headlamp that forms a crosslamp light distribution pattern. The vehicle lamp 10 may be a headlamp capable of switching between a high beam and a low beam or a fog lamp or the like.
    [0084]
    A modified example of the above embodiment is then described.
    [0085]
    Fig. 7 is a view similar to Fig. 2, showing a vehicle lamp 110 according to the present modified example.
    [0086]
    As shown in Fig. 7, the vehicle lamp 110 is a direct projection type lamp unit.
    [0087]
    Specifically, the vehicle lamp 110 includes the projection lens 20 and the cylindrical support 26, similarly to the vehicle lamp of the above embodiment. However, the vehicle lamp 110 is configured so that a light emitting element 130 as a light source is disposed in the position of the rear focus F of the projection lens 20.
    The light emitting element 130 is a white electroluminescent diode. The light emitting element 130 is configured such that surfaces of a plurality (e.g. seven) of rectangular light emitting surfaces 130a are arranged side by side in the width direction of the vehicle. In addition, the light emitting element 130 is supported on a base member 150 in the state in which the surfaces of the plurality of light emitting surfaces 130a are facing forward. On the other hand, the projection lens 20 is also supported on the base member 150 via the cylindrical support 26.
    [0089]
    Fig. 8 is a perspective view showing a road fire light distribution pattern PH which is formed on the virtual vertical screen by means of light radiated forwards by the vehicle lamp 110.
    [0090]
    The road light light distribution pattern PH forms an oblong light distribution pattern extending in the lateral direction around the line V-V. A hot zone HZH is formed at the central portion of the traffic light distribution pattern PH.
    [0091]
    The traffic light distribution pattern PH is formed so that the brightness gradually decreases from the hot zone HZH to the outer peripheral side. However, since the road fire light distribution pattern PH is formed as an oblong light distribution pattern, a phenomenon such as gradual decrease in brightness especially at the two left and right end portions PHa the traffic light distribution pattern PH appears in a remarkable way. In this way, it prevents the prior formation of a significant contrast on a road shoulder or the surface of a road in front of the vehicle. As a result, the uniformity of the light distribution pattern is improved and the visibility in front of the vehicle is sufficiently guaranteed.
    [0092]
    The traffic light distribution pattern PH is formed in this manner as a highly uniform light distribution pattern by means of the vehicle lamp 110 having the projection lens 20.
    [0093]
    In the case of adopting the configurations of this modified example, the same effects as those of the above embodiment can also be obtained.
    [0094]
    Of course, the numerical values shown as specifications in the above embodiments and their modified examples are only examples and may be set to different values as appropriate.
    [0095]
    In addition, the present invention is not limited to the configurations described in the above embodiments and their modified examples, but may use other configurations that are various variants of these configurations.
    权利要求:
    Claims (5)
    [1" id="c-fr-0001]
    A vehicle lamp (10, 110) comprising: a projection lens (20), and a light source (30, 130) disposed at the rear of the projection lens (20), the vehicle lamp (10, 110). ) being configured to radiate forward the light of the light source (30, 130) through the projection lens (20), wherein the projection lens (20) comprises a plurality of lenses (22, 24) disposed on an optical axis (Ax) extending in the longitudinal direction of the vehicle, and the rear main surface (Pr) of the projection lens (20) forms a convex curved surface having a curvature greater than the curvature of a surface spherical (SI) centered on the rear focus (F) of the projection lens (20).
    [2" id="c-fr-0002]
    The vehicle lamp (10, 110) according to claim 1, wherein the front surface (22a) of the lens (22) located at the most forward lens of the plurality of lenses (22, 24) can be a convex curved surface, the curvature of the optical axis (Ax) being set to a value in the range of 0.002 to 0.01 (1 / mm).
    [3" id="c-fr-0003]
    The vehicle lamp (10, 110) according to claim 2, wherein the forwardmost lens (22) forms a biconvex lens.
    [4" id="c-fr-0004]
    The vehicle lamp (10, 110) according to any one of claims 1 to 3, wherein a light reflection suppressing treatment is performed on the respective surfaces (22b, 24a) of the plurality of lenses (22, 24) other than the front surface (22a) of the foremost lens (22) and the rear surface (24b) of the rearmost lens (24).
    [5" id="c-fr-0005]
    The vehicle lamp (10, 110) according to any one of claims 1 to 4, wherein the lenses of the plurality of lenses (22, 24) are supported by a common cylindrical support (26), and an opening ( 26a) is formed in the peripheral surface portion of the cylindrical support (26).
    类似技术:
    公开号 | 公开日 | 专利标题
    FR3024762A1|2016-02-12|VEHICLE FIRE
    EP1434002B1|2006-10-11|Lighting module for vehicle headlight
    FR2868510A1|2005-10-07|LIGHT EMITTING LIGHT FOR A VEHICLE
    FR3011908B1|2019-08-30|LAMP FOR VEHICLE
    FR2863038A1|2005-06-03|VEHICLE HEADLIGHT HAVING THREE REFLECTORS
    EP2743567A1|2014-06-18|Primary optical element, lighting module and headlight for motor vehicle
    FR3049335A1|2017-09-29|VEHICLE FIRE, VEHICLE FIRE CONTROL SYSTEM, AND VEHICLE COMPRISING THE SAME
    EP2422130A1|2012-02-29|Lighting module and device for a vehicle with improved road function
    WO2016005409A1|2016-01-14|Lighting module for a motor vehicle
    FR2860281A1|2005-04-01|LAMP UNIT WITH PHOTOEMISSIVE ELEMENT FOR LIGHTHOUSE OF VEHICLE
    FR2931536A1|2009-11-27|HEADLIGHT FOR VEHICLE
    FR2867839A1|2005-09-23|LIGHTING BLOCK FOR VEHICLE
    FR2899311A1|2007-10-05|VEHICLE HEADLIGHT LAMP UNIT
    FR3049336A1|2017-09-29|VEHICLE FIRE AND VEHICLE PROVIDED WITH SAID FIRE
    FR2942020A1|2010-08-13|PROJECTION MODULE FOR A MOTOR VEHICLE PROJECTOR
    FR2864606A1|2005-07-01|Vehicle lamp unit, has transparent unit covering LED, and including two reflecting surfaces, and illuminating surface that transmits light reflected by one of reflecting surfaces towards front of transparent unit
    FR2853046A1|2004-10-01|HEADLIGHT FOR A PHOTOEMISSIVE PAD
    FR2853393A1|2004-10-08|VEHICLE HEADLIGHT WITH PHOTOEMISSIVE DIODE
    FR3038362A1|2017-01-06|VEHICLE LAMP
    FR3012867A1|2015-05-08|PRIMARY OPTICAL ELEMENT, LIGHT MODULE AND PROJECTOR FOR MOTOR VEHICLE
    FR3056688A1|2018-03-30|BI-FUNCTION LIGHTING MODULE IN TRANSPARENT MATERIAL
    FR2911384A1|2008-07-18|LAMP FOR VEHICLE
    FR3032778A1|2016-08-19|VEHICLE FIRE
    FR3005494A1|2014-11-14|LAMP UNIT AND LIGHT DEVIATION DEVICE
    FR3065784A1|2018-11-02|LUMINOUS MODULE WITH OPTICAL IMAGING OPTICS FOR A PIXELLIZED SPATIAL MODULATOR FOR A MOTOR VEHICLE
    同族专利:
    公开号 | 公开日
    US10234096B2|2019-03-19|
    DE102016211892A1|2017-01-05|
    FR3038362B1|2019-04-05|
    CN106322271B|2019-03-22|
    JP2017016928A|2017-01-19|
    CN106322271A|2017-01-11|
    US20170002991A1|2017-01-05|
    JP6556530B2|2019-08-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2171640A|1936-08-15|1939-09-05|Leitz Ernst Gmbh|Photographic objective|
    US2887566A|1952-11-14|1959-05-19|Marks Polarized Corp|Glare-eliminating optical system|
    DE3430273A1|1984-08-17|1986-02-27|Robert Bosch Gmbh, 7000 Stuttgart|HEADLIGHTS FOR LOW BEAM OR FOG LIGHTS OF MOTOR VEHICLES|
    DE3505771C2|1985-02-20|1987-01-22|Helmut Hund Gmbh, 6330 Wetzlar, De|
    JPH0954287A|1995-08-15|1997-02-25|Sony Corp|Hand shake compensating optical device|
    JP3739295B2|2001-03-23|2006-01-25|カンタツ株式会社|Optical instrument with two or more lenses positioned and fixed in the lens barrel|
    JP4055695B2|2003-10-28|2008-03-05|松下電器産業株式会社|Heat pump water heater|
    CN100532922C|2005-10-27|2009-08-26|财团法人车辆研究测试中心|Small LED lighting mould set for LED headlight group|
    FR2894322B1|2005-12-07|2015-09-18|Koito Mfg Co Ltd|VEHICLE FIRE|
    JP4754423B2|2006-07-07|2011-08-24|株式会社小糸製作所|Vehicle lighting|
    JP5366673B2|2009-06-17|2013-12-11|キヤノン株式会社|Optical system and optical apparatus having the same|
    DE102010029176A1|2009-10-05|2012-12-27|Automotive Lighting Reutlingen Gmbh|Motor vehicle headlight with a semiconductor light sources, a primary optics and a secondary optics having light module|
    CN201706353U|2010-05-28|2011-01-12|帝宝工业股份有限公司|Vehicle optical module|
    DE102010046626B4|2010-09-16|2013-05-16|Automotive Lighting Reutlingen Gmbh|Color-correcting projection optics for a light module of a motor vehicle headlight|
    DE102011004086C5|2011-02-14|2016-07-14|Automotive Lighting Reutlingen Gmbh|Method for producing a color-correcting projection optics|
    JP5909419B2|2012-07-24|2016-04-26|スタンレー電気株式会社|Projector type headlight|
    JP6498860B2|2013-09-05|2019-04-10|株式会社小糸製作所|Vehicle lamp and optical body|
    JP6576705B2|2015-06-23|2019-09-18|スタンレー電気株式会社|Vehicle lighting|FR3056698B1|2016-09-26|2019-06-28|Valeo Vision|LUMINOUS MODULE FOR MOTOR VEHICLE|
    JP2019145372A|2018-02-22|2019-08-29|株式会社小糸製作所|Lighting appliance for vehicle|
    DE102020118455A1|2020-07-13|2022-01-13|Marelli Automotive Lighting ReutlingenGmbH|Lens assembly for a light module of a motor vehicle headlight|
    法律状态:
    2017-05-11| PLFP| Fee payment|Year of fee payment: 2 |
    2018-05-07| PLFP| Fee payment|Year of fee payment: 3 |
    2018-08-31| PLSC| Search report ready|Effective date: 20180831 |
    2020-05-12| PLFP| Fee payment|Year of fee payment: 5 |
    2021-05-13| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2015133972A|JP6556530B2|2015-07-02|2015-07-02|Vehicle lighting|
    JP2015133972|2015-07-02|
    [返回顶部]