Vehicle headlamp

Abstract

To provide a vehicular headlamp capable of suppressing an influence of sunlight.SOLUTION: A vehicular headlamp includes: a light source portion that has a light source and a substrate supporting the light source; a reflector that reflects light from the light source; a lens that has an incident surface on which the light reflected by the reflector is incident, and an emission surface on which the light incident in the incident surface is emitted to an irradiation area in front of a vehicle; a supporting member that has a base supporting a bottom portion of the substrate, and side part supporting portion disposed on the base and supporting a side part of the substrate; and a holder that is formed using resin, is disposed at a position surrounding the substrate and the side part supporting portion of the base, and fixes the substrate to the supporting member. The supporting member has a rib portion shielding sunlight at a part of the base that is surrounded by the holder.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a vehicle headlamp.

Background Art

[0002] There is known a vehicle lamp including a light source unit having a light source and a substrate supporting the light source, a reflector that reflects light from the light source, and a lens that emits the light reflected by the reflector to an irradiation area in front of the vehicle. In such a vehicle lamp, a resin holder for fixing the substrate of the light source unit may be disposed around the substrate (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above vehicle lamp, sunlight may be condensed by the lens and irradiated onto the holder via the reflector. When irradiated with sunlight, the temperature of the resin holder may rise, and there is a risk of deformation or the like.

[0005] The present invention has been made in view of the above, and an object thereof is to provide a vehicle headlamp capable of suppressing the influence of sunlight.

Means for Solving the Problems

[0006] The vehicle headlamp according to the present invention includes a light source unit having a light source and a substrate that supports the light source, a reflector that reflects light from the light source, an incident surface on which the light reflected by the reflector is incident, and a lens having an exit surface that exits the light incident on the incident surface to an irradiation area in front of the vehicle, a base that supports the bottom of the substrate, and a support member having a side support portion that is disposed on the base and supports the side portion of the substrate, and a holder that is formed of resin and is disposed at a position surrounding the substrate and the side support portion of the base and fixes the substrate to the support member, and the support member has a rib portion that shields sunlight from a portion of the base surrounded by the holder.

[0007] In the above vehicle headlamp, the rib portion may be provided so as to protrude to a position higher than at least one of the side support portion and the holder from the base.

[0008] In the above vehicle headlamp, the rib portion may be disposed at a position between the side support portion and the holder.

[0009] In the above vehicle headlamp, the rib portion may be disposed on at least one side in the left - right direction in the vehicle - mounted state with respect to the light source unit.

[0010] In the above vehicle headlamp, the rib portion may be disposed at a position behind the light source and at a position in front of the light source in the vehicle - mounted state.

[0011] In the above vehicle headlamp, the rib portion disposed at a position behind the light source may have dimensions larger than those of the rib portion disposed at a position in front of the light source in at least one of the front - rear direction and the left - right direction.

[0012] In the above vehicle headlamp, the rib portion may be provided integrally with the side support portion.

[0013] In the above headlamp for a vehicle, the rib portion may be arranged along the inner circumference of the holder.

[0014] In the above headlamp for a vehicle, the rib portion may be arranged so that the distance from the inner circumference of the holder is constant.

Advantages of the Invention

[0015] According to the present invention, it is possible to provide a headlamp for a vehicle that can suppress the influence of sunlight.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0017] Hereinafter, an embodiment of a vehicle headlamp according to the present invention will be described with reference to the drawings. Note that the present invention is not limited by this embodiment. Also, the components in the following embodiment include those that can be replaced and are easy for those skilled in the art, or those that are substantially the same. In the following description, the front-rear, up-down, and left-right directions are the directions in the vehicle-mounted state where the vehicle headlamp is mounted on the vehicle, and indicate the directions when viewed from the driver's seat in the vehicle's traveling direction. In this embodiment, it is assumed that the up-down direction is parallel to the vertical direction and the left-right direction is the horizontal direction.

[0018] FIG. 1 is a diagram showing an example of a vehicle headlamp 100 according to this embodiment. As shown in FIG. 1, the vehicle headlamp 100 includes a light source unit 10, a reflector 20, a lens 30, a support member 40, a holder 50, and a shade 60. The light source unit 10, the reflector 20, the lens 30, the support member 40, and the holder 50 constitute a so-called projector-type lamp unit.

[0019] The light source unit 10 has a light source 11 and a substrate 12. In this embodiment, the light source 11 is a semiconductor light source such as an LED. The light source 11 has a light emitting surface 11a. When the vehicle headlamp 100 is attached to the vehicle, the light emitting surface 11a is directed upward, for example, and is arranged parallel to the horizontal plane. A plurality of, for example, three light sources 11 are supported on the substrate 12. The light source unit 10 is supported by a base 41 of the support member 40.

[0020] The reflector 20 reflects the light from the light source 11 toward the lens 30. The reflector 20 is arranged above the light source 11 and is formed using a material with high heat resistance and light impermeability, such as a holder. The reflector 20 is fixed to the support member 40 by a fixing member such as a screw.

[0021] The reflector 20 has a hollow shape with an open front portion and a lower portion, and a closed rear portion, an upper portion, and left and right side portions. On the inner surface of the reflector 20, a first reflecting surface 21 and a second reflecting surface 22 are formed. The first reflecting surface 21 and the second reflecting surface 22 reflect the light from the light source 11 toward the lens 30. The first reflecting surface 21 and the second reflecting surface 22 are a rotational ellipsoidal surface or a free-form surface based on the rotational ellipsoidal surface.

[0022] The lens 30 is disposed in front of the vehicle with respect to the reflector 20. The lens 30 is supported by, for example, a lens holder 35. The optical axis of the lens 30 coincides with or substantially coincides with the optical axis of the reflector 20. The lens 30 has an incident surface 31 and an exit surface 32. The incident surface 31 receives the reflected light from the reflecting surface 21.

[0023] The support member 40 supports the light source unit 10. Further, the support member 40 supports the reflector 20, the lens holder 35, etc. The support member 40 can be manufactured using, for example, die casting. As the support member 40, for example, a heat sink made of aluminum die-cast having heat dissipation properties may be used. The support member 40 has a base 41 and fins 42.

[0024] FIG. 2 is a perspective view showing the light source unit 10 and the support member 40. FIG. 3 is a view showing an example of the light source unit 10 and the support member 40 as viewed from above. FIG. 4 is a sectional view taken along the line A-A in FIG. 3. As shown in FIGS. 2 to 4, the base 41 has a bottom support portion 43, a side support portion 45, and a rib portion 46. The bottom support portion 43 is disposed at a position corresponding to the substrate 12 of the light source unit 10 in the base 41, and is provided so as to protrude upward from the upper surface of the base 41.

[0025] The fins 42 are disposed on the lower surface of the base 41. The heat generated in the light source 11 which is a semiconductor light source is discharged to the outside from the substrate 12 and the bottom support portion 43 through the base 41 and the fins 42. Note that the bottom support portion 43 and the base 41 may be integrally formed as a heat sink.

[0026] The side support portions 45 are arranged on the base 41 and support the side portions of the substrate 12. The side support portions 45 are arranged at positions along the four sides of the substrate 12. Two side support portions 45 are arranged for each side of the substrate 12, and a total of eight are provided. Each side support portion 45 is formed, for example, in a columnar shape and contacts the side portion of the substrate 12 at one point on the circumferential surface when viewed from above.

[0027] Hereinafter, when distinguishing the side support portions 45, the two side support portions 45 arranged rearward with respect to the substrate 12 are denoted as side support portions 45a and 45b, and the two side support portions 45 arranged forward with respect to the substrate 12 are denoted as side support portions 45c and 45d. Also, among the four side support portions 45 arranged on the left and right with respect to the substrate 12, the two side support portions 45 arranged on the rear side are denoted as side support portions 45e and 45f, and the two side support portions 45 arranged on the front side are denoted as side support portions 45g and 45h.

[0028] The rib portion 46 is provided in a portion of the base 41 surrounded by the holder 50. The rib portion 46 shields sunlight. The height h1 of the rib portion 46 is higher than at least one of the height h2 of the side support portion 45 and the height h3 of the holder 50. In the present embodiment, the rib portion 46 protrudes from the base 41 to a position higher than the heights of the side support portion 45 and the holder 50. That is, when the surface 41a of the base 41 is taken as the reference height, the height (vertical dimension) h1 of the rib portion 46 is higher than the height h2 of the side support portion 45 and the height h3 of the holder 50 (see FIG. 4).

[0029] The rib portion 46 is arranged at a lateral position in the left - right direction with respect to the substrate 12. In the present embodiment, the rib portion 46 is arranged on both sides in the left - right direction with respect to the substrate 12. When viewed from above, the rib portion 46 is arranged in a space portion formed between the side support portion 45 and the holder 50. In other words, when the substrate 12 is taken as a reference, the rib portion 46 is arranged at a position closer to the holder 50 side than the side support portion 45.

[0030] The rib portions 46 are arranged at a first position P1 and a second position P2 on the rear side of the light source 11 and at a third position P3 and a fourth position P4 on the front side of the light source 11. Hereinafter, when distinguishing the rib portions 46, the rib portions 46 arranged at the first position P1, the second position P2, the third position P3, and the fourth position P4 are respectively denoted as rib portions 61, 62, 63, and 64.

[0031] The rib portions 61 and 62 arranged at the first position P1 and the second position P2 can have dimensions larger than those of the rib portions 63 and 64 arranged at the third position P3 and the fourth position P4 in at least one of the front-rear direction and the left-right direction. In the present embodiment, the rib portions 61 and 62 have larger dimensions in the front-rear direction than the rib portions 63 and 64. Also, the rib portions 61 and 62 have larger dimensions in the left-right direction than the rib portions 63 and 64.

[0032] The rib portions 46 are respectively arranged along the inner circumference of the holder 50. The rib portions 46 are arranged such that the distance D from the inner circumference of the holder 50 is constant (see FIG. 3). The rib portion 61 arranged at the first position P1 has surfaces 61a and 61b facing the inner circumferential surface of the holder 50. The surface 61a faces a surface 50a which is a part of the inner circumferential surface of the holder 50. The surface 61a is arranged parallel or substantially parallel to the surface 50a of the holder 50. The surface 61b faces a surface 50b which is a part of the inner circumferential surface of the holder 50. The surface 61b is arranged parallel or substantially parallel to the surface 50b of the holder 50. Similarly, the rib portion 62 arranged at the second position P2 has surfaces 62a and 62b facing the inner circumferential surface of the holder 50. The surface 62a faces a surface 50c which is a part of the inner circumferential surface of the holder 50. The surface 62a is arranged parallel or substantially parallel to the surface 50c of the holder 50. The surface 62b faces a surface 50d which is a part of the inner circumferential surface of the holder 50. The surface 62b is arranged parallel or substantially parallel to the surface 50d of the holder 50.

[0033] Further, the rib portion 63 disposed at the third position P3 has surfaces 63a and 63b facing the inner peripheral surface of the holder 50. The surface 63a faces the surface 50a of the holder 50. The surface 63a is disposed parallel or substantially parallel to the surface 50a of the holder 50. The surface 63b faces the surface 50e which is a part of the inner peripheral surface of the holder 50. The surface 63b is disposed parallel or substantially parallel to the surface 50e of the holder 50. Similarly, the rib portion 64 disposed at the fourth position P4 has surfaces 64a and 64b facing the inner peripheral surface of the holder 50. The surface 64a faces the surface 50c of the holder 50. The surface 64a is disposed parallel or substantially parallel to the surface 50c of the holder 50. The surface 64b faces the surface 50f which is a part of the inner peripheral surface of the holder 50. The surface 64b is disposed parallel or substantially parallel to the surface 50f of the holder 50.

[0034] Each rib portion 46 is provided integrally with the side support portion 45. In the present embodiment, the rib portions 61 and 62 are provided integrally with the side support portions 45e and 45f, respectively. For example, the rib portions 61 and 62 project upward from the ends on the holder 50 side of the side support portions 45e and 45f and are provided in a state of extending toward the holder 50 side. Similarly, the rib portions 63 and 64 are provided integrally with the side support portions 45g and 45h, respectively. The rib portions 63 and 64 project upward from the ends on the holder 50 side of the side support portions 45g and 45h and are provided in a state of extending toward the holder 50 side.

[0035] The holder 50 is disposed on the base 41 of the support member 40. The holder 50 is not limited to the case where three light sources 11 are arranged as in the present embodiment, and can be applied with the same dimensions and shape even when four or more light sources 11, for example, five light sources 11 are arranged in the left - right direction. When four or more light sources 11 are arranged in the left - right direction, the dimension of the substrate in the left - right direction becomes larger compared to the configuration of the present embodiment. In order to prevent the holder 50 from interfering with the substrate and the side support portion in such a case, the dimensions are set such that a space is provided in the left - right direction between the substrate 12 and the side support portion 45 in the present embodiment. With this configuration, the holder 50 having the same configuration can be applied regardless of the number of light sources 11, that is, the dimension of the substrate 12.

[0036] The holder 50 has a main body portion 51 formed of a resin material, and a first terminal 52 and a second terminal 53 formed of a metal material. The main body portion 51 is formed, for example, in a rectangular annular shape. The main body portion 51 is disposed at a position surrounding the substrate 12 and the side support portion 43 when viewed from above. The main body portion 51 has a shape surrounding, for example, a cross-shaped space when viewed from above.

[0037] The first terminals 52 are respectively disposed on the front side and the rear side with respect to the main body portion 51. The first terminals 52 connect the substrate 12 from above. The second terminals 53 are respectively disposed on the right side and the left side with respect to the main body portion 51. The second terminals 53 are supported between the lateral side surfaces of the substrate 12 in the left-right direction and the inner circumferential surface of the holder 50, and are disposed in an elastically deformed state. The second terminals 53 connect the substrate 12 from both sides in the left-right direction by elastically deforming.

[0038] Returning to FIG. 1, the shade 60 is composed of a member capable of blocking light from the light source 11, such as a metal plate. The shade 60 is disposed between the light source 11 and the lens 30. The shade 60 is connected to a drive portion (not shown), and is movable between a first position where a part of the light reflected by the reflector 20, for example, is blocked, and a second position where the light is not blocked.

[0039] In the vehicle headlamp 100 configured as described above, for example, when the lighting switch provided in the vehicle is off, the light source 11 is in a turned-off state. When the lighting switch is switched on from this state, the light source 11 lights up. When the light source 11 lights up, light is emitted from the light emitting surface 11a and is reflected toward the lens 30 side by the first reflecting surface 21 and the second reflecting surface 22 of the reflector 20. The light reflected by the reflector 20 enters the incident surface 31, passes through the inside of the lens 30, and is emitted from the emission surface 32.

[0040] FIG. 5 and FIG. 6 are diagrams showing an example of the case where sunlight is incident on the vehicle headlamp 100 according to the present embodiment. As shown in FIGS. 5 and 6, sunlight L1 and L2 may be incident on the vehicle headlamp 100. The sunlight L1 and L2 are incident, for example, from the emission surface 32 of the lens 30, and are emitted in a state of being condensed from the incident surface 31 toward the reflector 20 side. The sunlight L1 and L2 emitted from the incident surface 31 are reflected by the first reflecting surface 21 and the second reflecting surface 22 of the reflector 20, and as shown in FIG. 6, travel obliquely downward above the substrate 12 and the support member 40 toward the holder 50. In the present embodiment, since the rib portion 46 is provided at a position higher than the height of the holder 50, the rib portion 46 shields the sunlight L1 and L2.

[0041] FIG. 7 is a diagram showing an example of the case where sunlight is incident on the vehicle headlamp 200 according to the comparative example. In the vehicle headlamp 200 shown in FIG. 7, the bottom of the substrate 112 is supported by the bottom support portion 143, and the side portion of the substrate 112 is supported by the side support portion 145. This vehicle headlamp 200 is not provided with a configuration corresponding to the rib portion 46 described in the above embodiment. As shown in FIG. 7, the sunlight L3 incident on the vehicle headlamp 200 and condensed toward the reflector side by a lens (not shown) is reflected by the first reflecting surface and the second reflecting surface of the reflector. The sunlight L3 travels obliquely downward above the substrate 112 and the support member 140 toward the holder 150 as shown in FIG. 7. When this sunlight L3 reaches the holder 150 and the main body portion 151 of the holder 150 is irradiated with the sunlight L3, the temperature of the main body portion 151 of the resin-made holder 150 may rise, and deformation or the like may occur.

[0042] On the other hand, the vehicle headlamp 100 according to the present embodiment includes a light source unit 10 having a light source 11 and a substrate 12 that supports the light source 11, a reflector 20 that reflects light from the light source 11, an incident surface 31 into which the light reflected by the reflector 20 is incident, and a lens 30 having an exit surface 32 that exits the light incident on the incident surface 31 to an irradiation area in front of the vehicle, a base 41 that supports the bottom of the substrate 12, and a support member 40 having a side support portion 45 that is disposed on the base 41 and supports the side portion of the substrate 12, and a holder 50 that is formed of resin and is disposed at a position surrounding the substrate 12 and the side support portion 45 of the base 41 and fixes the substrate 12 to the support member 40. The support member 40 has a rib portion 46 that shields sunlight in a portion of the base 41 surrounded by the holder 50.

[0043] According to this configuration, since the rib portion 46 that shields sunlight is provided in the portion of the base 41 surrounded by the holder 50, when sunlight is condensed and incident on the vehicle headlamp 100, the sunlight that is reflected by the reflector 20 and tends to travel toward the holder 50 can be shielded by the rib portion 46. Thereby, since it is possible to suppress the sunlight condensed by the lens 30 from irradiating the holder 50, the influence of sunlight can be suppressed.

[0044] In the vehicle headlamp 100 according to the present embodiment, the rib portion 46 is provided so as to protrude to a position higher than the height of the side support portion 45 and the height of the holder 50 from the base 41. Thereby, it is possible to more reliably shield sunlight that travels obliquely downward above the substrate 12 and the support member 40 toward the holder 50.

[0045] In the vehicle headlamp 100 according to the present embodiment, the rib portion 46 is disposed at a position between the side support portion 45 and the holder 50. Thereby, it is possible to reliably shield sunlight that is reflected by the reflector 20 and tends to travel toward the holder 50 beyond the side support portion 45.

[0046] In the vehicle headlamp 100 according to the present embodiment, the rib portion 46 is disposed on at least one side in the left - right direction in the vehicle - mounted state with respect to the light source portion 10. Thereby, it is possible to efficiently block sunlight that travels obliquely downward along the left - right direction from the reflector 20.

[0047] In the vehicle headlamp 100 according to the present embodiment, the rib portion 46 is disposed at a first position P1 and a second position P2 on the rear side of the light source 11 and at a third position P3 and a fourth position P4 on the front side of the light source 11 in the vehicle - mounted state. Thereby, it is possible to block sunlight on each of the rear side and the front side of the light source 11.

[0048] In the vehicle headlamp 100 according to the present embodiment, the rib portions 61, 62 disposed at the first position P1 and the second position P2 on the rear side of the light source 11 have dimensions larger than those of the rib portions 63, 64 disposed at the third position P3 and the fourth position P4 on the front side of the light source 11 in at least one of the front - rear direction and the left - right direction. Sunlight incident on the vehicle headlamp 100 enters from the front and travels rearward inside the vehicle headlamp 100. Therefore, by increasing the dimensions of the rib portions 61, 62 disposed at the rear first position P1 and the second position P2, it is possible to efficiently block sunlight.

[0049] In the vehicle headlamp 100 according to the present embodiment, the rib portion 46 is provided integrally with the side support portion 45. With this configuration, the space on the inner peripheral side of the holder 50 can be efficiently utilized.

[0050] In the vehicle headlamp 100 according to the present embodiment, the rib portion 46 is disposed along the inner periphery of the holder 50. With this configuration, it is possible to block sunlight incident from various angles toward the holder 50.

[0051] In the vehicle headlamp 100 according to the present embodiment, the rib portion 46 is disposed so as to have a constant distance from the inner periphery of the holder 50. With this configuration, it is possible to block sunlight incident from various angles toward the holder 50.

[0052] The technical scope of the present invention is not limited to the above-described embodiments, and appropriate modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the configuration in which the rib portion 46 is provided integrally with the side support portion 45 has been described as an example, but the present invention is not limited thereto. FIG. 8 is a diagram showing a partial configuration of a vehicle headlamp 100A according to a modified example. As shown in FIG. 8, in the support member 40A of the vehicle headlamp 100A, each of the rib portions 46 can be configured to be separated from the side support portion 45 and provided separately. That is, the rib portions 65, 66, 67, 68 respectively arranged at the first position P1, the second position P2, the third position P3, and the fourth position P4 can be configured to be provided separately from the side support portions 45p, 45q, 45r, 45s.

[0053] In the above-described embodiment, an example in which the rib portion 46 is configured along the inner circumference of the holder 50 has been described, but the present invention is not limited thereto. For example, the rib portion 46 may be configured to be inclined with respect to the inner circumference of the holder 50.

Description of Reference Numerals

[0054] D... Distance, L1, L2, L3... Sunlight, P1... First position, P2... Second position, P3... Third position, P4... Fourth position, 10... Light source unit, 11... Light source, 11a... Light emitting surface, 12, 112... Substrate, 20... Reflector, 21... First reflecting surface, 22... Second reflecting surface, 30... Lens, 31... Incident surface, 32... Exit surface, 35... Lens holder, 40, 40A, 140... Support member, 41... Base, 41a... Surface, 42... Fin, 43, 143... Bottom support portion, 45, 45a to 45h, 45p to 45s, 145... Side support portion, 46, 63 to 68... Rib portion, 61a, 61b, 62a, 62b, 63a, 63b, 64a, 64b, 50a to 50f... Surface, 50, 150... Holder, 51... Main body portion, 52... First terminal, 53... Second terminal, 60... Shade, 100, 100A, 200... Vehicle headlamp

Claims

1. A light source unit having a light source and a substrate supporting the light source; A reflector that reflects light from the light source; A lens having an incident surface on which the light reflected by the reflector is incident, and an exit surface that exits the light incident on the incident surface to an irradiation region in front of the vehicle; A support member having a base that supports the bottom of the substrate, and a side support portion that is disposed on the base and supports the side portion of the substrate; A holder formed using resin, disposed at a position surrounding the substrate and the side support portion of the base, and fixing the substrate to the support member; Comprising; The support member has a rib portion that shields sunlight from a portion of the base surrounded by the holder. A vehicle headlamp.

2. The rib portion is provided so as to protrude to a position higher than at least one of the side support portion and the holder from the base. The vehicle headlamp according to claim 1.

3. The rib portion is disposed at a position between the side support portion and the holder. The vehicle headlamp according to claim 1 or claim 2.

4. The rib portion is disposed on at least one side in the left - right direction in the vehicle - mounted state with respect to the light source unit. The vehicle headlamp according to any one of claims 1 to 3.

5. The rib portion is disposed at a position behind the light source and a position in front of the light source in the vehicle - mounted state. The vehicle headlamp according to any one of claims 1 to 4.

6. The rib portion disposed at a position behind the light source has dimensions larger than those of the rib portion disposed at a position in front of the light source in at least one of the front - rear direction and the left - right direction. The vehicle headlamp according to claim 5.

7. The rib portion is provided integrally with the side support portion. The vehicle headlamp according to any one of claims 1 to 6.

8. The rib portion is disposed along the inner circumference of the holder. The vehicle headlamp according to any one of claims 1 to 7.

9. The rib portion is disposed so that the distance from the inner circumference of the holder is constant. The vehicle headlamp according to any one of claims 1 to 8.

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