JP2018195467A - Vehicular lighting fixture - Google Patents

Abstract

To provide a vehicular lighting fixture which makes a depth dimension compact, which suppresses luminance unevenness, and which has made a shielding space provided on an emission surface side compact.SOLUTION: A reflection surface of a reflector for reflecting light from an LED light source mounted on a substrate is formed by a continuous diffusion reflection surface including a first reflection surface extending to a light source side and a second reflection surface extending to a tip side, a lens cover is arranged on the side opposing to the reflection surface of the reflector, and the substrate mounting the LED light source is disposed on an end part side of one of the reflector and the lens cover. On the surface on the emission surface side of the reflector, a lens cut is formed with a pitch shorter than 1.0 mm. Also, in front in the irradiation direction of the LED light source, a lens member is provided, and the lens member includes a vehicular signal lighting fixture unit in which the emission surface on the opposite side from the LED light source is formed as a diffusion surface.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a vehicle signal lamp unit such as a tail stop lamp provided in a two-wheeled vehicle, a tail stop lamp provided in a four-wheeled vehicle, a position lamp unit provided in a headlamp, and the like.

2. Description of the Related Art Conventionally, tail lamps having a compact depth dimension using an LED (light emitting diode) as a light source are known.
In the vehicular lamp of Patent Document 1, light from an LED is reflected using a main reflecting surface and a sub-reflecting surface including a multistage reflecting surface, and a convex portion provided with a diffusing prism and a concave portion not provided with a diffusing prism are provided. Irradiates outside through the inner lens.
In the vehicular lamp of Patent Document 2, light from a plurality of LEDs is irradiated toward the rear side in the irradiation direction of the lamp, and is reflected to the outside in the order of the first reflecting surface and the second reflecting surface.

JP 2008-146879 A JP 2012-119199 A

  In the vehicular lamp of Patent Document 1, the appearance of the multi-stage reflecting surface can be blurred by shifting the division or changing the direction of the reflecting surface, thereby improving the appearance. Further, a predetermined light distribution as a tail lamp is satisfied by passing through an inner lens provided with a convex portion provided with a diffusion prism and a concave portion provided with no diffusion prism.

  In the vehicular lamp of Patent Document 2, the depth dimension of the vehicular lamp is made compact by reflecting in the order of the first reflecting surface and the second reflecting surface. Moreover, the brightness | luminance nonuniformity by several LED was relieved by making a 1st reflective surface and a 2nd reflective surface into a diffuse reflection surface.

  However, the invention described in Patent Literature 1 transmits light reflected by a plurality of reflecting surfaces through an inner lens provided with a convex portion provided with a diffusion prism and a concave portion provided with no diffusion prism, thereby providing a light distribution necessary as a tail lamp. Therefore, when the light source is turned on, a phenomenon called so-called flashing occurs, and a plurality of light source images are observed corresponding to the number of reflecting surfaces, and the overall uniformity is poor. There was a problem. Further, it is possible to make the shadow inconspicuous by blurring the shadow of the stepped portion of the reflecting surface, but it is difficult to solve the luminance unevenness due to the flashing.

  In the invention described in Patent Document 2, a plurality of LEDs are installed such that the emission direction thereof is directed from the front side to the rear side of the vehicular lamp. Therefore, since the LEDs are installed on the exit surface side of the vehicular lamp, when the vehicular lamp is viewed from the irradiation direction, the plurality of LEDs must be covered with a shielding member so as not to be directly visible. In addition, there is a problem that a large space is required on the exit surface side for installing the LED.

  The present invention has been proposed in view of such conventional circumstances, and provides a vehicular lamp that has a compact depth dimension, suppresses uneven brightness, and has a compact shielding space provided on the exit surface side. For the purpose.

In order to achieve the above object, the invention described in claim 1
A vehicle lamp comprising: an LED light source mounted on a substrate; a reflector having a curved reflecting surface located on a center line of an optical axis of the LED light source; and a lens cover through which light reflected by the reflector is transmitted. There,
The reflection surface includes a first reflection surface extending from the intersection position intersecting the optical axis center line to the light source side in a cross section passing through the optical axis, and a second reflection surface extending from the intersection position to the lens cover side. ,
The first reflecting surface and the second reflecting surface are formed by a continuous diffuse reflecting surface,
The angle formed by the optical axis center line and the tangent on the first reflecting surface side at the intersection position is an acute angle,
In the lens cover, one end side is fixed to or located near one end of the reflector, and lens cuts are formed on the surface on the exit surface side with a pitch shorter than 1.0 mm,
The substrate is located in the vicinity of the other end of the lens cover and the other end of the reflector.

The invention according to claim 2 is the lamp according to claim 1,
A lens member is provided in front of the irradiation direction of the LED light source,
The lens member includes an entrance surface on the LED light source side and an exit surface on the side opposite to the LED light source,
The incident surface is a refracting surface that collects light from the LED light source;
The exit surface is formed as a diffusion surface that diffuses light incident from the entrance surface in at least one direction.

The invention according to claim 3 is the lamp according to claim 2,
The first reflecting surface and the second reflecting surface include an imaginary line connecting the LED light source and any point on the first reflecting surface or the second reflecting surface, and the first reflecting surface or the second reflecting surface. It is formed in a curved shape in which the angle on the LED light source side is an acute angle with the tangent line of the first reflecting surface or the second reflecting surface at the intersection point with the reflecting surface.

The invention according to claim 4 is the lamp according to claim 3,
The first reflecting surface and the second reflecting surface are made of a white matte film formed on the reflector.

Invention of Claim 5 is a lamp | ramp as described in any one of Claims 2-4,
The first reflecting surface and the second reflecting surface are made of a white matte film formed on the reflector.

According to the first aspect of the present invention, the LED as the light source is provided at the end of the reflector and is incident on the diffuse reflection surface at an acute angle. The light reflected by the diffuse reflection surface passes through the lens cover and is further diffused and emitted by the lens cut on the lens cover surface. Therefore, the depth dimension of the vehicle signal lamp can be made compact. Moreover, the dimension of the shielding member required in order to cover LED can be made small.
Further, the light reflected by the diffuse reflection surface is diffused and incident after being incident on the lens cover. Therefore, it is possible to improve the light emission uniformity of the lens cover that is the light emitting surface and enhance the uniformity.

  According to the second aspect of the present invention, the light that has passed through the lens member is further reflected by the diffuse reflection surface. The lens member is provided with an entrance surface composed of a refracting surface for condensing light and an exit surface composed of a diffusion surface. For this reason, the light reflected by the diffuse reflection surface becomes light that has already passed through the exit surface, which is a diffusion surface, so that the light emission uniformity of the lens cover that is the light emission surface can be further improved.

  According to the above configuration, it is possible to provide a vehicular signal lamp that has a curved reflecting surface provided at a predetermined angle with respect to the LED. According to this configuration, the depth dimension can be made compact and luminance unevenness can be suppressed. Furthermore, by providing a white matte film formed on the reflector, the reflectance and diffusivity can be ensured even when a material having a low reflectance is used as the reflector material.

It is a front view of the vehicular lamp which concerns on one Embodiment. It is a front view which shows the signal lamp unit for vehicles provided in the vehicle lamp of FIG. It is a schematic perspective view which decomposes | disassembles and shows the signal lamp unit for vehicles of FIG. It is sectional drawing along the AA line of the signal lamp unit for vehicles of FIG. It is a schematic cross section explaining the light ray in the signal lamp unit for vehicles of FIG. It is a front view which shows the signal lamp unit for vehicles which concerns on 3rd Embodiment. It is a schematic perspective view which decomposes | disassembles and shows the signal lamp unit for vehicles of FIG. It is sectional drawing along the BB line of the signal lamp unit for vehicles of FIG. It is a schematic cross section explaining the light ray in the signal lamp unit for vehicles of FIG. It is a top view which shows the lens member of the signal lamp unit for vehicles of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front (front) view of a vehicular lamp 1 according to this embodiment. In the following description, the descriptions “front”, “rear”, “left”, “right”, “upper”, and “lower” refer to the direction viewed from the vehicular lamp 1.

FIG. 1 shows two types of vehicle lamps 1, a rear combination lamp 3 mounted on the rear right side of the vehicle (not shown) and a lid lamp 2 mounted on the trunk so as to be adjacent to the rear combination lamp 3. Similarly, a rear combination lamp 3 and a lid lamp 2 are installed next to each other on the left side of the rear part of the vehicle.
The rear combination lamp 3 and the lid lamp 2 each include a lamp unit in a lamp chamber formed by a housing (not shown) and a translucent outer cover that covers a front opening of the housing. In the rear combination lamp 3, tail and stop lamp units 3a and 3a, a stop lamp unit 3b and a turn lamp unit 3c are arranged. In the lid lamp 2, a tail lamp unit 2a and a back lamp unit 2b And. The function and arrangement position of each lamp unit in the lid lamp 2 and the rear combination lamp 3 are appropriately changed according to the application and design. Irradiation light from each lamp unit passes through a light-transmitting outer cover (not shown) of each lamp and irradiates the outside of the lamp.

Next, the vehicle signal lamp unit 10 provided in the lid lamp 2 will be described as an example of each lamp unit.
2 is a front (front) view of the vehicular signal lamp unit 10 corresponding to the tail lamp unit 2a in the lid lamp 2, and FIG. 3 is an exploded schematic view of the vehicular signal lamp unit 10 of FIG. 4 is a cross-sectional view taken along line AA in FIG.

  As shown in FIG. 3, the vehicle signal lamp unit 10 includes a reflector 13, a substrate 11 disposed above the reflector 13, a light source including a plurality of LEDs 12 mounted on the substrate 11, and a lens provided in front of the reflector. The cover 14 is constituted by a light shielding member 18 and a decorative member 19 provided in front of the lens cover 14. In this embodiment, six LEDs 12 are mounted downward on the substrate 11 via solder in the present embodiment.

  The LED 12 is composed of a surface mount type LED package in which a red light emitting LED element functioning as a tail lamp and a stop lamp is provided in a reflection frame. The light distribution by the LED 12 is a type that can irradiate the surroundings wider than 10 ° around the optical axis that is the central axis of the light distribution characteristics. Preferably, a wide light distribution type capable of irradiating in the range of 30 ° to 60 ° around the optical axis is used. By using a surface-mounted LED of a wide light distribution type, a signal lamp unit having a light emitting surface with a large area can be obtained with a small number of LEDs.

  As the substrate 11, a metal-based wiring substrate in which an insulating film and an electrode film are pasted on a thick metal substrate is used. The substrate 11 has a plurality of holes for positioning and fixing to the reflector, and in the present embodiment, five holes are formed downward. The LED 12 is fixed by being caulked after being inserted into a boss 13c provided on the reflector so that the LED 12 faces downward. The substrate may be a printed substrate such as a glass epoxy resin.

  The reflector 13 is integrally formed with a reflection portion 13b having an inner surface with a concave curved curved surface as a basic shape toward the front, and a flange portion 13a on the upper side of the reflection portion 13b on which the substrate 11 is mounted. The inner surface of the reflecting portion 13b (the surface on the optical axis side of the LED 12) is used as the reflecting surface 20. The reflector 13 is formed by injection molding a white ASA resin (acrylate styrene acrylonitrile). As the ASA resin, a multicolor resin material exhibiting excellent weather resistance is provided on the market, and since it is excellent in aesthetics, the resin material can be used as the reflecting surface 20 as it is. Further, a thermoplastic resin material such as ABS resin (acrylonitrile butadiene styrene), acrylic resin, polycarbonate resin or the like may be used.

  As shown in FIG. 4, the reflecting surface 20 is formed in a concave shape that intersects the optical axis center line Ax of the LED 12. A first reflection surface 21 located above the intersection P between the optical axis center line Ax and the reflection surface 20, that is, the flange 13a side to which the LED 12 is attached, and a lower side from the intersection P, that is, the flange 13a of the reflector 13 are provided. It consists of the 2nd reflective surface 22 located in the reflector front-end | tip part 13d side on the opposite side to an edge part. The reflecting surface 20 may further be provided with a third reflecting surface (not shown) on the reflector tip portion 13d side. The reflected light reflected by the third reflecting surface is reflected so as to be guided from the front end side of the lens cover 14 into the lens cover 14. Thereby, the lens cover 14 can be used as a light emitting part.

  The first reflecting surface 21 has an intersection point P from the end side on the flange 13a side of the reflector so that the angle θ on the LED 12 side, which is an angle between the tangent L at the intersection point P and the optical axis center line Ax, becomes an acute angle. It consists of a continuous curved surface. The surface of the first reflection surface 21 is formed as a diffuse reflection surface roughened in a satin finish.

  The 2nd reflective surface 22 consists of a continuous curved surface between the intersection P and the reflector front-end | tip part 13d side. The surface of the second reflecting surface 22 is formed as a diffuse reflecting surface roughened in a satin finish. The 1st reflective surface 21 and the 2nd reflective surface 22 are formed by the diffuse reflection surface which continued smoothly. In the first reflecting surface 21 and the second reflecting surface 22, the tangent line of each reflecting surface has an acute angle with the optical axis center line Ax, that is, the angle θ on the LED 12 side between the tangent line and the optical axis center line is All are formed to have an acute angle.

  As shown in FIGS. 3 and 4, the lens cover 14 is disposed in front of the reflector 13 and covers the entire reflection surface 20. A first lens portion 15 extending from the lens cover end portion 14a on the flange portion 13a side of the reflector 13 to the lens cover front end portion 14b on the side farther from the LED 12 on the reflection surface 20, and a second lens positioned between the LED 12 and the reflection surface 20. The lens portion 16 is integrally formed. The second lens portion 16 extends from the connecting portion 14c branched from the first lens portion 15 toward the vicinity of the first reflecting surface 21 beyond the optical axis center line Ax. The distal end of the second lens portion 16 is fixed in contact with the proximal end portion of the reflecting portion 13 b of the reflector 13. The distal end of the first lens portion 15, that is, the lens cover distal end portion 14b is positioned by being fitted into an attachment hole provided in the reflector distal end portion 13d.

  The first lens unit 15 includes an inner incident surface 15a facing the reflecting surface 20, an outer emission surface 15b and an outer light shielding surface 15c opposite to the inner incident surface 15a. As shown in FIG. 2, the outer emission surface 15b forms a large number of diffusion lens surfaces that are finely divided in a matrix in the vertical and horizontal directions. Each diffusion lens surface is set so that the vertical and horizontal diffusion angles can provide light distribution characteristics suitable for the function of the vehicular signal lamp unit 10. In this embodiment, the shape of curvature suitable for the tail lamp and the stop lamp is formed at a pitch of 0.5 mm. The inner entrance surface 15a is provided with a semi-cylindrical lens cut extending in the up-down direction for spreading in the left-right direction at the same pitch as the outer exit surface 15b. Thereby, the spreading | diffusion to a horizontal direction can be expanded and the light distribution pattern extended to the left-right direction compared with an up-down direction can be obtained. Moreover, since light is spread to the region between adjacent LEDs 12 that are likely to be darker than the region directly below the LED 12, uneven brightness between the LEDs 12 is suppressed. Further, since the lens cut of the inner incident surface 15a and the lens cut of the outer emission surface 15b are set to the same pitch, there is no overlap of lens cut in the front view, so that the uniformity during non-lighting is improved.

  The outer light-shielding surface 15c shields the light emission surface and forms a design shape as shown in FIG. In the present embodiment, the light shielding member 18 is fixed to the outside of the outer light shielding surface 15c. A light-emitting surface with high contrast can be obtained by providing the outer light-shielding surface 15c in a space surrounded by the outer light-emitting surface 15b serving as a light-emitting surface. The light shielding member 18 is fixed by inserting a hook of the light shielding member 18 into a hook hole provided in the outer light shielding surface 15c.

  A decorative member 19 is provided outside the first lens portion 15, and the periphery of the outer emission surface 15 b is shielded by the decorative member 19. The decorative member 19 has a shape that covers at least the flange portion 13a of the housing and the vicinity of the substrate 11, and prevents direct observation of the LED 12 and the like when not lit, and prevents light leakage during lighting. it can. The decorative member 19 and the light shielding member 18 are formed of the same material and the same color, but may have different colors. The decorative member 19 has a tail lamp unit opening 19a and a back lamp unit opening 19b.

  The second lens portion 16 is formed with a lens cut portion 16 a made of a diffusing lens surface at a position corresponding to the LED 12. In the present embodiment, as shown in FIG. 3, six lens cut portions 16a are provided, and a region between the lens cut portions 16a is a through shape without a lens cut. The lens cut portion 16a is formed by an incident surface 16b that faces the emitting surface of the LED 12, and an emitting surface 16c that is opposite to the incident surface 16b. The incident surface 16b is formed so as to collect the light irradiated from the LED 12 so as to be spread over a predetermined range around the optical axis center line Ax, to be collimated, and to travel through the second lens unit 16. . The exit surface 16 c is formed with a diffusing lens cut so as to diffuse the light that has been converted into parallel rays and travels through the second lens portion 16 toward the reflecting surface 20. The diffusing lens cut provided on the emission surface 16c was formed at a pitch of 0.5 mm, which is the same pitch as the outer emission surface 15b.

  Next, the optical system of the vehicular signal lamp unit 10 will be described with reference to FIG.

  The light emitted from the LED 12 is converted into a substantially parallel light beam by the incident surface 16 b of the second lens unit 16, travels through the second lens unit 16, is diffused by the diffusion lens cut formed on the output surface 16 c, and is reflected on the reflective surface 20. Proceed toward. The ray Ray1 indicates one of the rays that are emitted from the outer emission surface 15b of the first lens unit after being directed to the first reflecting surface 21. A ray Ray2 indicates one of the rays that are emitted from the outer emission surface 15b of the first lens unit after being directed to the intersection point P.

  The light ray Ray1 diffuses at four interfaces of the emission surface 16c of the second lens unit 16, the first reflection surface 21, the inner incident surface 15a of the first lens unit 15, and the outer emission surface 15b. The light ray Ray2 is diffused at four interfaces of the exit surface 16c of the second lens unit 16, the intersection P of the reflection surface 20, and the inner entrance surface 15a and the outer exit surface 15b of the first lens unit 15. A distance from the LED 12 to the reflecting surface 20 is provided, and the light diffused by the reflecting surface 20 is further diffused by the inner incident surface 15a and the outer emitting surface 15b of the first lens unit 15, so that the light of the LED 12 is diffused. Thus, the uniformity of the outer light exit surface 15b of the first lens portion serving as the design surface can be improved. Furthermore, since the light emitted from the LED 12 is focused and diffused by the second lens unit 16 before reaching the reflecting surface 20, the utilization efficiency of the light emitted from the LED 12 is increased and the reflecting surface 20 is Uniformity is further improved by advancing the diffused light.

  The lens cover 14 is located behind the outer cover (not shown) of the vehicular lamp 1. The exit surface 15 b of the first lens portion corresponds to the inner lens 17. Accordingly, the emission surface 15b of the first lens portion and the light shielding member 18 are viewed through the outer cover and observed as a design surface.

Next, a second embodiment of the vehicle signal lamp unit will be described.
Since the second embodiment has the same configuration as the above-described embodiment (first embodiment) except for the following points, the description thereof is omitted here.
In the second embodiment, a diffuse reflection film (not shown) is formed on the reflection surface 20 of the vehicular signal lamp unit 10. The diffuse reflection film is formed by applying a white material containing a pigment made of titanium oxide to the surface of the reflection surface 20. In order to achieve both diffusibility and reflection characteristics, the reflection surface 20 is a surface provided with fine irregularities, and a non-glossy diffuse reflection film is applied thereon.

  In the second embodiment, since the diffuse reflection film provided on the surface of the reflection surface 20 is used as a reflection surface, a highly reflective material is not used as a reflector material, and reflection characteristics and diffusivity can be improved. Therefore, the range of material selection for the reflector material can be expanded, and the cost of the reflector material can be reduced.

  Next, a third embodiment of the vehicle signal lamp unit will be described with reference to FIGS.

  The third embodiment is a vehicle signal lamp unit 30 corresponding to a tail and stop lamp unit provided in the rear combination lamp 3 as an example of the lamp unit of FIG. 6 is a front (front) view of the vehicular signal lamp unit 30, FIG. 7 is an exploded schematic view of the vehicular signal lamp unit 30 of FIG. 6, and FIG. 8 is a line BB in FIG. FIG. FIG. 9 is a schematic cross-sectional view for explaining the optical system of the vehicular signal lamp unit 30. 10 is a plan view showing a lens member of the vehicular signal lamp unit of FIG. 7, in which (A) is an exit surface and (B) is an entrance surface.

  As shown in FIGS. 7 and 8, the vehicle signal lamp unit 30 includes a reflector 33, a substrate 31 disposed on the rear side of the reflector 33, a light source including a plurality of LEDs 32 mounted on the substrate 31, and a reflector. The lens cover 34 is provided opposite to the lens cover 34, and the light shielding member 38 and the decorative member 39 are provided in front of the lens cover 34. In this embodiment, four LEDs 32 are mounted on the substrate 31 via solder from the rear side to the front side in the present embodiment. Reference numeral 36 denotes a second inner lens, and reference numeral 44 denotes a bracket for supplying power to the LED 32.

  The LED 32 uses a surface-mount type LED package in which a red light emitting LED element that functions as a tail and stop lamp unit is provided in a reflection frame. As the substrate 31, a metal-based wiring substrate in which an insulating film and an electrode film are attached on a thick metal substrate is used. By using a metal-based substrate as the substrate 31, heat transfer and heat dissipation can be improved. In the present embodiment, a total of four LEDs 32 are arranged in a line on the substrate 31.

  The reflector 33 is integrally formed with a reflecting portion 33b having an inner surface whose basic shape is a concave curved curved surface toward the front in the irradiation direction, and a decorative reflecting portion 33a that curves and extends below the reflecting portion 33b. . The inner surface of the reflecting portion 33 b (the surface on the optical axis side of the LED 32) is used as the reflecting surface 40. The reflector 33 is formed by injection molding using a thermoplastic resin material, and a white reflective diffusion film (not shown) is formed on the surface thereof. The white reflective diffusion film is coated with a white resin containing ceramic particles, and the surface thereof is roughened. A white reflective diffusion film (not shown) serves as the reflective surface 40.

  As shown in FIGS. 1 and 7, the reflecting surface 40 is formed in a concave shape that intersects the optical axis center line Ax of the LED 32. A first reflecting surface 41 located on the light source side from the intersection point P of the optical axis center line Ax and the reflecting surface 40, that is, the substrate 31 side provided with the LED 32, and a second reflecting surface located on the reflector tip 43 side from the intersection point P. 42.

  The first reflection surface 41 is formed so that the angle θ between the tangent L at the intersection P and the optical axis center line Ax, that is, the angle on the LED 32 side is an acute angle as shown in FIG. It consists of a continuous curved surface. The surface of the first reflecting surface 41 is formed as a diffuse reflecting surface provided with fine irregularities.

  The second reflecting surface 42 is a continuous curved surface extending from the intersection P to the reflector tip 43. The surface of the second reflecting surface 42 is also formed as a diffuse reflecting surface provided with fine irregularities. The first reflecting surface 41 and the second reflecting surface 42 are smoothly connected. In the first reflecting surface 41 and the second reflecting surface 42, the tangent line of each reflecting surface has an acute angle with the optical axis center line Ax, that is, the angle θ on the LED 32 side between the tangent line and the optical axis center line is All are formed to have an acute angle.

As shown in FIGS. 7 and 8, the lens cover 34 is disposed in front of the reflector 33 and covers the entire reflection surface 40. The reflector 33 extends from the end located near the LED 32 to the reflector tip 43. A first inner lens portion 35 that covers the reflecting surface 40 and a decorative lens portion 35d that has a shape corresponding to the decorative reflecting portion 33a and extends downwardly from the first inner lens portion 35 are integrally formed.
The decorative lens part 35d covers the decorative reflecting part 33a, and the light emitted from the LED 32 incident on the first inner lens part 35 is guided to leak into the decorative lens part 35d. A dot-like cut is provided on the surface of the decorative lens portion 35d. As a result, the leakage light that has been guided through the decorative lens portion 35d is reflected and slightly combined with the decorative reflecting portion 33a, thereby improving visibility and decorativeness.

  The first inner lens portion 35 has an inner incident surface 35a facing the reflecting surface 40, an outer emission surface 35b and an outer light shielding surface 35c opposite to the inner incident surface 35a. As shown in FIGS. 6 and 7, the outer emission surface 35 b forms a large number of diffusion lens surfaces that are finely divided in a matrix in the vertical and horizontal directions. Each diffusion lens surface is set so that the vertical and horizontal diffusion angles can provide light distribution characteristics suitable for the function of the vehicular signal lamp unit 10. In the present embodiment, the curvature is adapted to the tail lamp and the stop lamp, and the pitch is 0.5 mm. The inner entrance surface 35a is provided with a semi-cylindrical lens cut for spreading in the left-right direction at the same pitch as the outer exit surface 35b. Thereby, the spreading | diffusion to a horizontal direction can be expanded and the light distribution pattern extended to the left-right direction compared with an up-down direction can be obtained. Furthermore, since the lens cut of the inner entrance surface 35a and the lens cut of the outer exit surface 35b are set to the same pitch, there is no overlap of the lens cut in the front view, so that the uniformity during non-lighting is improved. In FIGS. 8 and 9, fine lens cuts on the inner and outer sides are omitted in order to simplify the drawings.

  The outer light-shielding surface 35c shields the light emission surface and forms a design shape as shown in FIG. In the present embodiment, the light shielding member 38 is fixed to the outside of the outer light shielding surface 35c. A high-contrast light-emitting surface can be obtained by providing the outer light-shielding surface 35c in a space surrounded by the outer light-emitting surface 35b serving as a light-emitting surface. The light shielding member 38 is not limited to fixing a separately formed resin material, and a coating film may be provided.

  A decorative member 39 is provided on the outer side of the first lens portion 35, and the periphery of the outer emission surface 35 b is shielded by the decorative member 39. The decorative member 39 has a shape that covers the vicinity of the substrate 31 and prevents direct observation of the LEDs 32 and the like when not lit, and prevents light leakage during lighting. The decorative member 39 has a plurality of lamp unit openings 19a formed in the center, and a plurality of tamp units such as a tail and stop lamp unit, a stop lamp unit, and a turn lamp are formed in the opening 19a. Set up a unit and decorate it.

  The lens cover 34 is located behind the outer cover (not shown) of the rear combination lamp 3. The outer emission surface 35 b of the first inner lens 35 corresponds to the inner lens 37. Accordingly, the outer emission surface 35b and the shielding member 38 of the first inner lens are viewed through the outer cover and observed as a design surface.

  A second inner lens 36 is provided between the LED 32 and the reflecting surface 40. The second inner lens 36 is formed by molding a transparent polycarbonate resin, and is located at the proximal end portion of the reflector 33 and the lens cover 34 on the side where the LEDs 32 are disposed. Specifically, it is combined with a substrate 31 on which a plurality of LEDs 32 are mounted. The optical axis center line Ax of the LED 32 and the optical center of the second inner lens 36 are positioned and fixed so as to coincide with each other.

  In the second inner lens 36, a lens portion is formed by an incident surface 36b that faces the emitting surface of the LED 32 and an emitting surface 36c opposite to the incident surface 36b. FIG. 10 is a plan view for explaining the lens cut of the lens portion of the second inner lens. (A) is an exit surface, and (B) is an entrance surface. The incident surface 36b is formed so as to collect the light irradiated from the LED 32 so as to spread over a predetermined range around the optical axis center line Ax, to be converted into parallel rays and to travel through the second inner lens 36. . The exit surface 36 c is formed with a diffusing lens cut so that the light that has been converted into parallel rays and travels through the second inner lens portion 36 is diffused and emitted, and is directed toward the reflection surface 40. The pitch of the diffusion lens cut is a fine cut smaller than the lens cut pitch of the outer emission surface 35 b of the first inner lens portion 35. Thereby, the uniformity of a light emission surface can be improved more.

  Next, the optical system of the vehicle signal lamp unit 30 will be described with reference to FIG.

  The light emitted from the LED 32 is converted into a substantially parallel light beam by the incident surface 36 b of the second inner lens 36, travels through the second inner lens 36, is diffused by the diffusion lens cut formed on the emission surface 36 c, and is reflected on the reflecting surface 40. Proceed toward. The light ray Ray1 indicates one of the light rays emitted from the outer emission surface 35b of the first inner lens portion 35 after going toward the first reflection surface 41. The light ray Ray2 is one of the light rays emitted from the outer emission surface 35b of the first inner lens portion 35 after going to the second reflecting surface 42.

  The light ray Ray1 diffuses at four interfaces of the emission surface 36c of the second inner lens portion 36, the first reflection surface 41, the inner incident surface 35a of the first inner lens portion 35, and the outer emission surface 35b. The light ray Ray2 is also diffused at four interfaces of the emission surface 36c, the second reflection surface 42, the inner incident surface 35a and the outer emission surface 35b of the first inner lens portion 35 of the second inner lens portion 36. The distance from the LED 32 toward the reflecting surface 40 is increased, and the light diffused by the reflecting surface 40 is further diffused by the inner incident surface 35a and the outer emitting surface 35b of the first inner lens portion 35. Can be expanded while diffusing, and the uniformity of the outer emission surface 35b of the first inner lens portion 35 serving as a design surface can be improved. Further, since the light emitted from the LED 32 is collected and diffused by the second inner lens 36 before reaching the reflecting surface 40, the utilization efficiency of the light emitted from the LED 32 is increased and the reflecting surface 40 is Uniformity is further improved by advancing the diffused light.

In FIG. 6, the decorative light emitting part formed by the decorative reflecting part 33a and the decorative lens part 35d shown in FIG. 7 is omitted.
As an application example of this embodiment, a third reflecting surface (not shown) may be provided on the reflecting surface 40 so that the amount of light traveling toward the decorative light emitting portion increases, and the decorative light emitting portion can function as the stop lamp unit 3b.

  In all the embodiments described above, the lens members arranged in front of the LEDs 12 and 32, that is, the diffusion surfaces formed on the emission surfaces of the second lens portion 16 and the second inner lens 36 are formed with lens cuts having a predetermined pitch. The surface is uneven. The lens cut pitch formed on the exit surface side of the lens covers 14 and 34 is also formed at the same 0.5 mm pitch. As a modification of the above-described embodiment, the lens cut pitch can be modified. According to the study by the inventors, the pitch of the lens cuts formed on the exit surface side of the lens covers 14 and 34 is preferably shorter than 1.0 mm, and preferably 0.5 mm or less. When the pitch is longer than 1.0 mm, the light emitting surface has a poor uniformity. When the pitch is 0.5 mm or less, the light emitting surface is highly uniform. Further, the lens cut pitch formed on the exit surface side of the lens covers 14 and 34 is formed on the exit surface of the lens member disposed in front of the LEDs 12 and 32, that is, the second lens portion 16 and the second inner lens 36. It is preferable to make it shorter than the pitch of the diffusion surface. The diffusion by the lens cut formed on the exit surface side of the lens covers 14 and 34 divides and diffuses the light diffused at least at the two interfaces of the reflection surface and the exit surface of the lens member. According to the study by the inventor, it is effective to improve the uniformity by shortening the pitch of the lens cut formed on the exit surface side of the lens covers 14 and 34 as compared with the case where the pitch of the lens member is changed. Met.

Although the embodiments of the present invention and the modifications thereof have been described above, the above embodiments and modifications are merely examples in all respects. The present invention is not construed as being limited to these descriptions. The present invention can be added, omitted, replaced, and changed in other various forms without departing from the spirit of the present invention.
For example, the reflecting surface of the reflector has been described as a continuous curved surface, but a multi-stage reflecting surface based on a certain curved surface may be used, and a diffuse reflection coating film may be provided on the surface.

DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2 ... Lid lamp 3 ... Rear combination lamp 10, 30 ... Vehicle signal lamp unit 11 ... Board | substrate 12 ... Light source (LED)
DESCRIPTION OF SYMBOLS 13 ... Reflector 14 ... Lens cover 15 ... 1st lens part 16 ... 2nd lens part 17 ... Inner lens 18 ... Light shielding member 19 ... Decoration member 20 ... Reflective surface 21 ... 1st reflective surface 22 ... 2nd reflective surface 31 ... Board | substrate 32 ... Light source (LED)
33 ... Reflector 34 ... Lens cover 35 ... First inner lens portion 36 ... Second inner lens 37 ... Inner lens 38 ... Light blocking member 39 ... Decoration member 40 ... Reflecting surface 41 ... First reflecting surface 42 ... Second reflecting surface Ax ... Optical axis center line P ... intersection point L ... tangent line θ ... angle between the optical axis center line and the tangent line of the reflecting surface

Claims (5)

A vehicle lamp comprising: an LED light source mounted on a substrate; a reflector having a curved reflecting surface located on a center line of an optical axis of the LED light source; and a lens cover through which light reflected by the reflector is transmitted. There,
The reflection surface includes a first reflection surface extending from the intersection position intersecting the optical axis center line to the light source side in a cross section passing through the optical axis, and a second reflection surface extending from the intersection position to the lens cover side. ,
The first reflecting surface and the second reflecting surface are formed by a continuous diffuse reflecting surface,
The angle formed by the optical axis center line and the tangent on the first reflecting surface side at the intersection position is an acute angle,
In the lens cover, one end side is fixed to or located near one end of the reflector, and lens cuts are formed on the surface on the exit surface side with a pitch shorter than 1.0 mm,
The vehicular lamp, wherein the substrate is located in the vicinity of the other end of the lens cover and the other end of the reflector. A lens member is provided in front of the irradiation direction of the LED light source,
The lens member includes an entrance surface on the LED light source side and an exit surface on the side opposite to the LED light source,
The incident surface is a refracting surface that collects light from the LED light source;
The vehicular lamp according to claim 1, wherein the exit surface is formed as a diffusion surface that diffuses light incident from the incident surface in at least one direction.   The first reflecting surface and the second reflecting surface include an imaginary line connecting the LED light source and any point on the first reflecting surface or the second reflecting surface, and the first reflecting surface or the second reflecting surface. 3. A curved shape in which the angle on the LED light source side between the first reflection surface and the tangent line of the second reflection surface at the intersection point with the reflection surface is an acute angle. The vehicle lamp as described in 2.   4. The vehicular lamp according to claim 3, wherein the first reflecting surface and the second reflecting surface are made of a white matte film formed on the reflector. 5. The diffusion surface formed on the exit surface of the lens member is an uneven surface on which lens cuts of a predetermined pitch are formed,
5. The vehicular lamp according to claim 2, wherein the predetermined pitch is equal to or shorter than a pitch of a lens cut formed on an exit surface side of the lens cover.

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