JP2016081833A - Vehicular head lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that in a conventional vehicular head lamp, a place on which strong light from an LED or semiconductor light source reflects, and a reflection surface in the vicinity of the place are not effectively utilized.SOLUTION: A vehicular head lamp includes a semiconductor light source 2, a projection lens 3, and a reflector 4. A main reflection surface 40 of the reflector 4 is divided into a convex reflection surface 44 projecting on the side of a light-emitting surface 22 through a step surface 43, and another reflection surface 45. The convex reflection surface 44 crosses so as to straddle over a vertical line V from the light emission surface 22. Consequently, the vehicular head lamp effectively utilizes a place on which strong light L1 from the semiconductor light source 2 is reflected, and the convex reflection surface 44 to be a reflection surface in the vicinity of the place.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle headlamp including a semiconductor-type light source.

  This type of vehicle headlamp has been conventionally used (for example, Patent Document 1 and Patent Document 2). A conventional vehicle headlamp disclosed in Patent Document 1 includes an LED, a reflector having a reflective surface that reflects light from the LED, and a lens that irradiates the front of the vehicle with reflected light from the reflective surface in a predetermined light distribution pattern. Are provided. A conventional vehicle headlamp disclosed in Patent Document 2 includes a semiconductor-type light source and a reflector having a reflecting surface that reflects light from the semiconductor-type light source and irradiates the front of the vehicle with a predetermined light distribution pattern. It is.

  LEDs and semiconductor light sources used in this type of vehicle headlamp have strong light directivity, that is, a narrow light emission range. For this reason, in this type of vehicle headlamp, the range in which the light from the LED or semiconductor light source is reflected by the reflecting surface of the reflector is narrow. As a result, in this type of vehicle headlamp, when the reflecting surface of the reflector is divided into roles (for example, condensing, diffusing, etc.), it is gradually changed (gradually changed) on the narrow reflecting surface. Or change smoothly, or change slowly).

  Therefore, in the conventional vehicle headlamp disclosed in Patent Document 1, the reflection surface is divided into a rear reflection surface and a front reflection surface via a non-reflection plane of the stepped portion. Moreover, in the conventional vehicle headlamp of Patent Document 2, the reflection surface is divided into a first reflection surface and a second reflection surface protruding from the first reflection surface through a step surface.

JP 2010-123473 A JP 2009-26587 A

  However, in the conventional vehicle headlamps, the reflecting surface is divided into a vertical line or a substantially vertical line from the light emitting surface of the LED or the semiconductor type light source and the reflecting surface in the vicinity thereof (that is, from the LED or the semiconductor type light source). The portion where the strong light is reflected and the reflection surface in the vicinity thereof and the other reflection surfaces are not divided. That is, the conventional vehicle headlamps share one role by the location where the strong light from the LED or semiconductor light source is reflected, the reflection surface in the vicinity thereof, and the reflection surface in the vicinity thereof. For this reason, the conventional vehicle headlamp does not share one role only by the location where strong light from the LED or the semiconductor-type light source is reflected and the reflective surface in the vicinity thereof. That is, the conventional vehicular headlamp does not effectively use a portion where strong light from an LED or a semiconductor light source is reflected and a reflection surface in the vicinity thereof.

  The problem to be solved by the present invention is that a conventional vehicle headlamp does not effectively use a portion where strong light from an LED or a semiconductor light source is reflected and a reflection surface in the vicinity thereof.

  According to the present invention (the invention according to claim 1), a semiconductor-type light source having a light emitting surface, a reflector having a reflecting surface for reflecting light from the light emitting surface, and a reflected light from the reflecting surface in a predetermined light distribution pattern A reflective surface is divided into a convex reflective surface protruding to the light emitting surface side through the step surface and another reflective surface, and the convex reflective surface is separated from the light emitting surface. It cross | intersects so that it may straddle the vertical line or almost vertical line.

  This invention (the invention according to claim 2) is characterized in that the area of the convex reflection surface is larger than the area of the light emitting surface.

  According to the present invention (the invention according to claim 3), both the convex reflection surface and the other reflection surface are free-form surfaces or spheroid surfaces based on a spheroid having a first focal point located at or near the semiconductor light source. It is comprised from these, It is characterized by the above-mentioned.

  In this invention (the invention according to claim 4), the convex reflection surface forms a light distribution pattern of a diffusion system, and the reflection surface closer to the semiconductor-type light source than the convex reflection surface among the other reflection surfaces is collected. Forms a light distribution pattern of the light system, and forms a light distribution pattern in which the reflection surface farther from the semiconductor-type light source than the convex reflection surface is slightly diffused than the light distribution pattern of the condensing system It is characterized by.

  The vehicular headlamp according to the present invention can bear one role only by the other reflecting surface and the divided reflecting surface. Moreover, the vehicular headlamp according to the present invention is such that the convex reflection surfaces intersect so as to straddle a vertical line or a substantially vertical line from the light emitting surface. As a result, the vehicular headlamp according to the present invention effectively uses the convex reflection surface, which is a reflection surface in the vicinity of the portion where the strong light from the semiconductor light source is reflected.

FIG. 1 is a plan view of a lamp unit showing an embodiment of a vehicle headlamp according to the present invention. FIG. 2 is a longitudinal sectional view of the lamp unit (a sectional view taken along line II-II in FIG. 1). FIG. 3 is a longitudinal sectional view of the lamp unit (a sectional view taken along line III-III in FIG. 1).

  Hereinafter, an example of an embodiment (example) of a vehicle headlamp according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. 2 and 3, the hatching of the semiconductor light source and the hatching of the projection lens are omitted in FIG. 2. In this specification, front, rear, upper, lower, left, and right are front, rear, upper, lower, left, and right when the vehicle headlamp according to the present invention is mounted on the vehicle.

(Description of Configuration of Embodiment)
Hereinafter, the configuration of the vehicle headlamp in this embodiment will be described. In this example, for example, a headlamp of an automotive headlamp will be described.

(Description of the vehicle headlamp 1)
In FIG. 1, the code | symbol 1 is the headlamp for vehicles in this embodiment. The vehicle headlamp 1 is mounted on each of the left and right sides of the front portion of the vehicle. As shown in FIG. 1, the vehicle headlamp 1 includes a lamp housing (not shown), a lamp lens (not shown), a semiconductor light source 2, a projection lens 3 as a lens, and a reflector 4. And a heat sink member 5.

  The lamp housing and the lamp lens (for example, a transparent outer lens) define a lamp chamber (not shown). The semiconductor-type light source 2, the projection lens 3, the reflector 4, and the heat sink member 5 constitute a projector-type lamp unit. The lamp units 2, 3, 4, and 5 are disposed in the lamp chamber, and are provided with a vertical optical axis adjustment mechanism (not shown) and a horizontal optical axis adjustment mechanism (not shown). Are attached to the lamp housing.

  Note that lamp units other than the lamp units 2, 3, 4, 5 such as a clearance lamp unit, a turn signal lamp unit, and a daytime running lamp unit may be disposed in the lamp chamber. In addition, an inner panel (not shown), an inner housing (not shown), an inner lens (not shown), or the like may be disposed in the lamp chamber.

(Description of heat sink member 5)
The heat sink member 5 is made of a material having high thermal conductivity such as resin or metal die casting (aluminum die casting). The semiconductor light source 2, the projection lens 3, and the reflector 4 are attached to the heat sink member 5. The heat sink member 5 serves as both a heat radiating member and a mounting member. The heat sink member 5 includes a plate portion 50 and a plurality of upper fin portions 51 and lower fin portions 52.

  The plate portion 50 includes a first horizontal plate portion, a second horizontal plate portion, a vertical plate portion, a ring plate portion, and an oblique plate portion. On one surface of the first horizontal plate portion and one surface of the oblique plate portion, a plurality of the upper fin portions 51 are integrally provided in the front-rear direction and in parallel or substantially in parallel. A plurality of the upper fin portions 51 are also integrally provided in the front-rear direction and in parallel or substantially in parallel on one surface of the second horizontal plate portion and one surface of the vertical plate portion. On the other surface of the first horizontal plate portion, the other surface of the second horizontal plate portion, the other surface of the vertical plate portion, and the other surface of the oblique plate portion, a plurality of the lower fin portions 52 are provided in the front-rear direction. And in parallel or almost parallel to each other.

(Description of the semiconductor-type light source 2)
The semiconductor-type light source 2 is a self-luminous semiconductor-type light source such as an LED, an OEL, or an OLED (organic EL). The semiconductor light source 2 has a light emitting surface 22 that emits light. The light emitting surface 22 is upward in this example. The semiconductor light source 2 is supplied with a current from a lighting circuit (not shown).

  The semiconductor light source 2 is mounted on the heat sink member 5 and attached to the first horizontal plate portion of the heat sink member 5 via a holder 20. The holder 20 is attached to the first horizontal plate portion of the heat sink member 5 with a screw 21.

(Description of the projection lens 3)
The projection lens 3 is made of a resin lens such as a PC material, a PMMA material, or a PCO material. That is, since the light emitted from the light emitting surface 22 of the semiconductor light source 2 does not have high heat, a resin lens can be used as the projection lens 3. The projection lens 3 is attached to the ring plate portion of the heat sink member 5. The projection lens 3 may be attached to the heat sink member 5 using a holder separate from the heat sink member 5 instead of the ring plate portion.

  The projection lens 3 is light from the light emitting surface 22 of the semiconductor light source 2, and the reflected light from the reflector 4 is converted into a predetermined light distribution pattern, in this example, a low beam light distribution pattern (not shown). And as an additional light distribution pattern (not shown), it irradiates outside, ie, the front of a vehicle. The projection lens 3 has a focal point (a meridional image plane which is a focal plane on the object space side) and an optical axis (not shown).

  The projection lens 3 is a projection lens based on an aspherical surface. The projection lens 3 includes a rear entrance surface 30 and a front exit surface 31. The incident surface 30 faces the reflector 4. The incident surface 30 is substantially flat or aspheric (convex or concave with respect to the reflector 4). The exit surface 31 is an aspherical convex surface.

(Description of reflector 4)
The reflector 4 is made of, for example, a highly heat-resistant and light-impermeable material such as a resin member. The reflector 4 is attached to the first horizontal plate portion of the heat sink member 5 with a screw 42. The reflector 4 is composed of a synthetic resin mold molded product formed by filling a synthetic resin from a gate into a mold (not shown) space.

  The reflector 4 has a hollow shape in which a front portion and a lower portion are open, and a rear portion, an upper portion, and left and right side portions are closed. The concave inner surface of the closed portion of the reflector 4 is provided with a main reflecting surface (convergent reflecting surface) 40 formed of a free-form curved surface or a rotating ellipsoid based on a spheroidal surface (ellipse). The main reflecting surface 40 faces the light emitting surface 22. The main reflecting surface 40 reflects light from the light emitting surface 22 toward the projection lens 3. In this example, an additional reflection surface 41 is provided on the front side of the main reflection surface 40 (on the projection lens 3 side).

  The main reflection surface 40 is divided into a convex reflection surface 44 projecting to the light emitting surface 22 side (lower side) through a step surface 43 and another reflection surface 45. The convex reflection surfaces 44 intersect so as to straddle a vertical line or a substantially vertical line (hereinafter simply referred to as “vertical line”) V from the light emitting surface 22. The area of the convex reflection surface 44 is larger than the area of the light emitting surface 22. The convex reflection surface 44 is downward in this example.

  Both the convex reflection surface 44 and the other reflection surface 45 of the main reflection surface 40 are formed of a free-form surface or a spheroid surface based on a spheroid surface (ellipse). Both the convex reflection surface 44 and the other reflection surface 45 of the main reflection surface 40 have a first focal point F1, a second focal point (or second focal line) not shown, and an optical axis (not shown).

  The convex focal surface 44 of the main reflective surface 40 and the first focal point F1 of the other reflective surface 45 are located at or near the center O of the light emitting surface 22 of the semiconductor-type light source 2. The vertical line V passes through the center O or the vicinity thereof. The second focal point of the convex reflecting surface 44 of the main reflecting surface 40 and the other reflecting surface 45 is located at or near the focal point of the projection lens 3.

  The convex reflection surface 44 of the main reflection surface 40 forms, for example, a light distribution pattern (not shown) of a diffusion system of a low beam light distribution pattern. On the other hand, the other reflecting surface 45 of the main reflecting surface 40 forms a light distribution pattern (not shown) of a condensing system of a low beam light distribution pattern. That is, of the other reflecting surfaces 45, the reflecting surface closer to the semiconductor-type light source 2 than the convex reflecting surface 44 (in this example, the rear side from the vertical line V in FIG. The reflection surface on the second side) forms a light distribution pattern of the condensing system of the low beam light distribution pattern. Further, of the other reflecting surfaces 45, the reflecting surface farther from the semiconductor-type light source 2 than the convex reflecting surface 44 (in this example, the front side of the vertical line V in FIG. ) Is a light distribution pattern of the light condensing system of the low beam light distribution pattern, which is slightly diffused than the light distribution pattern of the light condensing system formed by the reflective surface on the side close to the semiconductor light source 2. The light distribution pattern thus formed is formed.

  The convex focal surface 44 of the main reflective surface 40 and the first focal point F1 of the other reflective surface 45 are located at or near the center O of the light emitting surface 22 of the semiconductor-type light source 2. The vertical line V passes through the center O or the vicinity thereof. The second focal point of the convex reflecting surface 44 of the main reflecting surface 40 and the other reflecting surface 45 is located at or near the focal point of the projection lens 3.

(Description of the operation of the embodiment)
The vehicle headlamp 1 in this embodiment is configured as described above, and the operation thereof will be described below.

  The light emitting surface 22 of the semiconductor light source 2 is turned on. Then, the light emitted from the light emitting surface 22 is reflected toward the projection lens 3 by the convex reflection surface 44 of the main reflection surface 40 of the reflector 4 and the other reflection surfaces 45 and the additional reflection surface 41.

  That is, the light L1 from the light emitting surface 22 and reflected by the convex reflecting surface 44 is transmitted through the projection lens 3, and is distributed in a diffusion system of a predetermined light distribution pattern, in this example, a low beam light distribution pattern. The light pattern is irradiated to the outside, that is, the front of the vehicle. Further, the light reflected from the other reflecting surface 45, which is the light from the light emitting surface 22, is transmitted through the projection lens 3, and is distributed in a condensing system of a predetermined light distribution pattern, in this example, a low beam light distribution pattern. The light pattern is irradiated to the outside, that is, the front of the vehicle. That is, of the other reflecting surfaces 45, the reflecting surface closer to the semiconductor-type light source 2 than the convex reflecting surface 44 (in this example, the reflection on the rear side (semiconductor-type light source 2 side) from the vertical line V in FIG. The reflected light reflected from the surface) is irradiated to the outside, that is, the front of the vehicle, as a light distribution pattern of a condensing system of a low beam light distribution pattern. Further, of the other reflecting surfaces 45, the reflecting surface farther from the semiconductor light source 2 than the convex reflecting surface 44 (in this example, the reflecting surface on the front side (projection lens 3 side) from the vertical line V in FIG. 2). The reflected light reflected by the light source is a light distribution pattern of the light condensing system of the low beam light distribution pattern, and is slightly diffused than the light distribution pattern of the light condensing system formed by the reflecting surface on the side close to the semiconductor light source 2. The light distribution pattern is irradiated outside, that is, in front of the vehicle. Further, the light reflected from the additional reflection surface 41, which is light from the light emitting surface 22, passes through the projection lens 3 and is irradiated to the outside, that is, the front of the vehicle, as an additional light distribution pattern.

(Explanation of effect of embodiment)
The vehicle headlamp 1 in this embodiment has the above-described configuration and operation, and the effects thereof will be described below.

  The vehicle headlamp 1 according to this embodiment has one role sharing, that is, a predetermined light distribution pattern, only by the other reflecting surface 45 and the convex reflecting surface 44 divided from the main reflecting surface 40 of the reflector 4. Then, the light distribution pattern of the diffusion system of the low beam light distribution pattern can be assumed. Moreover, the vehicle headlamp 1 in this embodiment is such that the convex reflection surface 44 intersects so as to straddle the vertical line V from the light emitting surface 22. As a result, the vehicular headlamp 1 in this embodiment effectively uses the convex reflection surface 44 that is a portion where strong light from the light emitting surface 22 of the semiconductor light source 2 is reflected and a reflection surface in the vicinity thereof.

  In the vehicle headlamp 1 in this embodiment, the area of the convex reflection surface 44 is larger than the area of the light emitting surface 22. For this reason, the vehicle headlamp 1 in this embodiment has a stepped surface of the convex reflecting surface 44 so that the light L1 from the light emitting surface 22 does not enter the stepped surface 43, as shown in FIGS. 43 can be easily inclined. That is, the inclination (gradient) of the stepped surface 43 of the convex reflecting surface 44 can be matched with the direction in which the reflector 4 is molded. As a result, the vehicular headlamp 1 according to this embodiment can easily form the reflector 4 in which the convex reflecting surface 44 protrudes toward the light emitting surface 22 via the step surface 43. In addition, since the light L1 does not enter the step surface 43 where light distribution control is difficult, highly accurate light distribution control can be obtained.

  In the vehicle headlamp 1 in this embodiment, both the convex reflecting surface 44 and the other reflecting surface 45 have a spheroid surface whose first focal point F1 is located at or near the center O of the light emitting surface 22 of the semiconductor-type light source 2. It consists of a basic free-form surface or spheroid. For this reason, the vehicle headlamp 1 according to this embodiment has a predetermined light distribution pattern, in this example, a low-beam light distribution pattern, and a light distribution pattern of a diffusion system. An optical light distribution pattern can be easily formed.

(Description of example other than embodiment)
In this embodiment, a low beam light distribution pattern is irradiated. However, in the present invention, a light distribution pattern other than the low beam light distribution pattern, for example, a high beam light distribution pattern, a highway light distribution pattern, a fog lamp light distribution pattern, or the like may be irradiated.

  Further, in this embodiment, the light emitting surface 22 is upward and the convex reflection surface 44 is downward. However, in the present invention, the light emitting surface 22 may be facing downward, the convex reflecting surface 44 may be facing upward, the light emitting surface 22 may be facing right, the convex reflecting surface 44 may be facing left, The surface 22 may face left and the convex reflection surface 44 may face right.

  Further, in this embodiment, the convex reflection surface 44 of the main reflection surface 40 forms a light distribution pattern of the diffusion system of the low beam light distribution pattern, and the other reflection surface 45 of the main reflection surface 40 is the low beam light distribution pattern. The light distribution pattern of the light condensing system is formed. However, in the present invention, the convex reflection surface 44 of the main reflection surface 40 forms a light distribution pattern of the condensing system of the low beam light distribution pattern, and the other reflection surface 45 of the main reflection surface 40 is the low beam light distribution pattern. The light distribution pattern of the diffusion system may be formed.

  Furthermore, in this embodiment, the reflective surface on the side closer to the semiconductor light source 2 than the convex reflective surface 44 among the other reflective surfaces 45 forms a light distribution pattern of the condensing system of the low beam light distribution pattern, Further, among the other reflecting surfaces 45, the reflecting surface farther from the semiconductor-type light source 2 than the convex reflecting surface 44 is the light distribution pattern of the condensing system of the low beam light distribution pattern, and is closer to the semiconductor-type light source 2 A light distribution pattern that is slightly diffused than the light distribution pattern of the condensing system formed by the reflecting surface is formed. However, in the present invention, of the other reflection surfaces 45, the reflection surface farther from the semiconductor-type light source 2 than the convex reflection surface 44 is from the light distribution pattern formed by the reflection surface closer to the semiconductor-type light source 2. Alternatively, a light distribution pattern that is slightly condensed may be formed.

DESCRIPTION OF SYMBOLS 1 Vehicle headlamp 2 Semiconductor type light source 20 Holder 21 Screw 22 Light emission surface 3 Projection lens 30 Incident surface 31 Output surface 4 Reflector 40 Main reflection surface 41 Additional reflection surface 42 Screw 43 Step surface 44 Convex reflection surface 45 Other reflection surfaces 5 heat sink member 50 plate portion 51 upper fin portion 52 lower fin portion F1 first focus L1 light from light emitting surface L2 reflected light from convex reflecting surface O center V vertical line

Claims (4)

A semiconductor-type light source having a light emitting surface;
A reflector having a reflecting surface for reflecting light from the light emitting surface;
A lens that irradiates the front of the vehicle with the light reflected from the reflecting surface in a predetermined light distribution pattern;
With
The reflective surface is divided into a convex reflective surface protruding to the light emitting surface side through a step surface, and another reflective surface,
The convex reflection surfaces intersect so as to straddle a vertical line or a substantially vertical line from the light emitting surface,
A vehicle headlamp characterized by that. The area of the convex reflecting surface is wider than the area of the light emitting surface,
The vehicle headlamp according to claim 1. The convex reflection surface and the other reflection surface are both composed of a free-form surface or a spheroid surface whose first focal point is based on a spheroid surface located in the semiconductor-type light source or in the vicinity thereof.
The vehicle headlamp according to claim 1 or 2, characterized in that The convex reflection surface forms a light distribution pattern of a diffusion system,
Of the other reflective surfaces, the reflective surface closer to the semiconductor light source than the convex reflective surface forms a light distribution pattern of a condensing system,
Of the other reflective surfaces, the reflective surface farther from the semiconductor-type light source than the convex reflective surface forms a light distribution pattern that is slightly diffused than the light distribution pattern of the condensing system.
The vehicle headlamp according to any one of claims 1 to 3, wherein

Images