JP5991046B2 - Vehicle headlamp - Google Patents

Description

  The present invention relates to a reflector-type vehicle headlamp having a reflecting surface that reflects light from a semiconductor-type light source as a predetermined light distribution pattern.

  This type of vehicle headlamp has been conventionally used (for example, Patent Document 1). Hereinafter, a conventional vehicle headlamp will be described. A conventional vehicle headlamp includes a light emitting module and a reflector having a reflecting surface, and the reflecting surface is composed of a plurality of segments. The light from the light emitting module is reflected by a plurality of segments on the reflecting surface and irradiated to the front of the vehicle as a light distribution pattern of a plurality of predetermined portions. A plurality of predetermined light distribution patterns are superimposed (synthesized) to form a predetermined entire light distribution pattern.

JP2011-238511A

  However, in the conventional vehicle headlamp, a plurality of hot zone forming segments are divided on the left and right sides and a plurality of segments on the top and bottom. For this reason, in the conventional vehicle headlamp, the effective reflection surface of the segment is reduced due to the step between the upper and lower segments, and a vapor deposition pool is formed when the reflection surface is surface-treated by aluminum vapor deposition. .

  In view of this, a vehicle headlamp that divides a reflecting surface of a reflector into a plurality of segments on the left and right is considered. However, if the segment is divided into left and right, the light distribution characteristic obtained when the segment is divided into upper, lower, left and right may not be obtained. For example, the light intensity (illuminance, light amount) of a point that illuminates the far side of the low-beam light distribution pattern on the traveling lane side may be insufficient.

  The problem to be solved by the present invention is that when the segment is divided into left and right, the light intensity (illuminance, light amount) at a predetermined point of the light distribution pattern may be insufficient.

  The present invention (the invention according to claim 1) includes a semiconductor-type light source and a reflector having a reflection surface that reflects light from the semiconductor-type light source as a predetermined light distribution pattern, and the reflection surface has a plurality of segments. A plurality of segments, each of which has a plurality of segments for forming a light distribution pattern, and a plurality of diffusion pattern formation segments for forming a light distribution pattern. The two condensing pattern forming segments are adjacent to each other and divided by a vertical dividing line, and the dividing line is one condensing with respect to the reference dividing line. It is characterized by crossing from the pattern forming segment side to the other light collecting pattern forming segment side.

  This invention (the invention according to claim 2) is characterized in that the dividing line is a curved line.

  In this invention (invention according to claim 3), the dividing line crosses from one condensing pattern forming segment side to the other condensing pattern forming segment side at a location away from the semiconductor-type light source. It is characterized by that.

  In the vehicle headlamp according to the present invention, the vertical dividing line that divides the two condensing pattern forming segments into the left and right is separated from the one condensing pattern forming segment side with respect to the reference dividing line. It crosses the optical pattern forming segment side. For this reason, the reflective surface of one condensing pattern formation segment can be increased because the vertical dividing line crosses over the other condensing pattern forming segment side. With this increased reflection surface, it is possible to increase the amount of light applied to a predetermined point of the light distribution pattern having insufficient light intensity (illuminance, light amount). As a result, even if the segment is divided into left and right, the light intensity (illuminance, light amount) at a predetermined point of the light distribution pattern can be sufficiently satisfied.

FIG. 1 is a front view of a semiconductor light source and a reflector showing an embodiment of a vehicle headlamp according to the present invention. FIG. 2 is a partially enlarged sectional view of the reflector (an enlarged sectional view taken along line II-II in FIG. 1). 3 is a cross-sectional view (a cross-sectional view taken along line III-III in FIG. 1) of the semiconductor-type light source, the reflector, and the heat sink member. FIG. 4 is an explanatory diagram showing a first light collection pattern formed by the first light collection pattern forming segment and a second light collection pattern formed by the second light collection pattern forming segment. FIG. 5 is an explanatory diagram showing a first diffusion pattern formed by the first diffusion pattern forming segment and a second diffusion pattern formed by the second diffusion pattern forming segment. 6 shows a low beam light distribution pattern (a light distribution pattern obtained by superimposing (combining) the first light collection pattern and the second light collection pattern in FIG. 4 with the first diffusion pattern and the second diffusion pattern in FIG. 5). It is explanatory drawing.

  Embodiments (examples) of a vehicle headlamp according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. 4 to 6, reference sign “VU-VD” indicates vertical lines on the upper and lower sides of the screen. Reference sign “HL-HR” indicates horizontal lines on the left and right of the screen. 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 1 in this embodiment will be described. The vehicle headlamp 1 of this embodiment is, for example, a headlamp that irradiates a low beam light distribution pattern in front of a vehicle (not shown).

(Description of the vehicle headlamp 1)
As shown in FIGS. 1 to 3, the vehicle headlamp 1 is mounted on both left and right sides of the front portion of the vehicle. The vehicle headlamp 1 includes a lamp housing (not shown), a lamp lens (not shown), a semiconductor-type light source 2, a reflector 3, and a heat sink member 4.

  The semiconductor-type light source 2, the reflector 3, and the heat sink member 4 constitute a lamp unit of a low beam lamp. The lamp housing and the lamp lens define a lamp chamber (not shown). The lamp units 2, 3, and 4 are disposed in the lamp chamber, and are disposed via an up / down direction optical axis adjustment mechanism (not shown) and a left / right direction optical axis adjustment mechanism (not shown). Attached to the lamp housing. In the lamp chamber, lamp units other than the lamp units 2, 3, and 4, for example, a high beam lamp, a fog lamp, a turn signal lamp, a clearance lamp, a daytime running lamp, and a cornering lamp may be arranged. .

(Description of the semiconductor-type light source 2)
As shown in FIGS. 1 and 3, the semiconductor-type light source 2 is a self-luminous semiconductor-type light source such as an LED or an EL (organic EL) in this example. The semiconductor light source 2 includes a light emitting unit 20 and a substrate 21. The light emitting unit 20 is mounted substantially at the center of the lower surface of the substrate 21. The substrate 21 is fixed to the horizontal plate portion 40 of the heat sink member 4 with screws or the like (not shown).

  The light emitting unit 20 includes a package (LED package) in which a light emitting chip (LED chip) is sealed with a sealing resin member. The light emitting chip of the light emitting unit 20 has a planar rectangular shape (planar rectangular shape). That is, a plurality of, for example, four square light emitting chips are arranged. One rectangular light emitting chip or one square light emitting chip may be used. Moreover, you may use what formed the light emitting chip | tip by arranging in 1 row or multiple rows. The lower surface (lower surface) of the light emitting chip of the light emitting unit 20 forms a light emitting surface. The light emitting surface of the light emitting unit 20 faces downward.

(Description of reflector 3)
As shown in FIGS. 1 to 3, the reflector 3 has a partial shape of a rotating parabola (rotating paraboloid), that is, a shape including a lower portion, a rear portion, and left and right side portions excluding an upper portion and a front portion. Make. The reflector 3 is fixed to the semiconductor light source 2 or the heat sink member 4 with a screw or the like (not shown).

  A reflective surface 300 is provided on the inner surface of the reflector 3. The reflective surface 300 faces the light emitting surface of the light emitting unit 20 facing downward. The reflection surface 300 is a reflection surface made of a parabolic free-form surface. As a result, the reflecting surface 300 has a reference focal point F and a reference optical axis (not shown). The reference focal point F of the reflecting surface 300 is located at or near the center O of the light emitting surface of the semiconductor-type light source 2. The reference optical axis of the reflecting surface 300 passes through or near the center O of the light emitting surface of the semiconductor light source 2.

  The reflection surface 300 is a free-form reflection surface that reflects light from the semiconductor-type light source 2 to the front of the vehicle as a low-beam light distribution pattern LP as indicated by a solid arrow in FIG. As shown in FIG. 6, the low beam light distribution pattern LP includes an oblique cut-off line CL1, a horizontal cut-off line CL2, and an elbow point (a point at or near the intersection of the oblique cut-off line CL1 and the horizontal cut-off line CL2) E. And have.

  In the low beam light distribution pattern LP, the oblique cut-off line CL1 is located on the traveling lane side (left side for left side traveling, right side for right side traveling), and the horizontal cutoff line CL2 is on the opposite lane side (left side). It is located on the right side for travel and on the left side for right travel. Note that a horizontal cut-off line is also formed on the traveling lane side with respect to the oblique cut-off line CL1.

  The reflecting surface 300 of the reflector 3 is divided into a plurality of segments 31, 32, 33, and 34. In this example, the left and right segments are divided into twelve, and the left and right segments 33 and 34 of the two middle segments 31 and 32 are divided into two in the vertical direction.

  The plurality of segments includes a first segment 31 and a second segment 32 that are two condensing pattern forming segments, and a third segment 33 and a fourth segment 34 that are a plurality of diffusion pattern forming segments. The first segment 31 and the second segment 32 are adjacent to each other and are divided by a vertical dividing line 302. The left and right width of the first segment 31 and the left and right width of the second segment 32 increase from an end portion close to the semiconductor-type light source 2 toward an end portion farther from the semiconductor-type light source 2. That is, the area of the first segment 31 and the area of the second segment 32 increase from a location close to the semiconductor-type light source 2 to a location far from the semiconductor-type light source 2. As a result, the amount of reflected light in the first segment 31 and the amount of reflected light in the second segment 32 can be increased.

  Each of the segments 31 to 34 is optically designed so as to form a partial light distribution pattern of the low beam light distribution pattern LP.

  That is, the first segment 31 which is a central segment divided into left and right and located on the opposite lane side with respect to the semiconductor-type light source 2 forms a first light collection pattern P1 shown in FIG. To do. Similarly, a second segment 32 which is a central segment divided into left and right and located on the traveling lane side with respect to the semiconductor-type light source 2 forms a second light collection pattern P2 shown in FIG. To do.

  A plurality of third segments 33 located on the opposite lane side from the first segment 31 are formed by superimposing (combining) the first diffusion patterns P3 shown in FIG. Similarly, the plurality of fourth segments 34 located on the traveling lane side from the second segment 32 are formed by superimposing (combining) the second diffusion patterns P4 shown in FIG.

  The first condensing pattern P1 is slightly diffused to the left and right (in the range of about 10 ° on the left HL and about 10 ° on the right HR) as compared to the second condensing pattern P2, and the horizontal cut-off line. CL2 and an oblique cut-off line that is gentler than the oblique cut-off line CL1. The second condensing pattern P2 is concentrated in the center (a range of about 7 ° on the left HL and about 5 ° on the right HR) as compared to the first condensing pattern P1, and the oblique cut-off line CL1. And the horizontal cut-off line CL2 and the elbow point E.

  Further, the first diffusion pattern P3 is diffused on the traveling lane side (a range of about 38 ° on the left HL and about 31 ° on the right HR) as compared with the second diffusion pattern P4, and the horizontal cut Has offline CL2. Compared with the first diffusion pattern P3, the second diffusion pattern P4 is diffused on the opposite lane side (a range of about 31 ° on the left HL and about 38 ° on the right HR), and the horizontal cutoff line CL2 Have

  Here, the first segment 31 and the second segment 32 have a reference dividing line 301 (a vertical line passing through or near the center O of the light emitting surface of the semiconductor light source 2, a two-dot chain line in FIG. 1). The case of being divided will be described. As described above, the first segment 31 divided by the reference dividing line 301 is slightly diffused to the left and right (in a range of about 10 °) compared to the second light collection pattern P2. The condensing pattern P1 is formed. For this reason, in the said 1st condensing pattern P1, the luminous intensity (illuminance, light quantity) of the part P0 shown with the broken line in FIG. 4 (A) may be slightly insufficient.

  Therefore, the first segment 31 and the second segment 32 are separated from the reference dividing line 301 by a dividing line 302 (in FIG. 1) crossing from the first segment 31 side to the second segment 32 side. To the left and right. The dividing line 302 is a curved line, and crosses from the first segment 31 side to the second segment 32 side at a location away from the semiconductor-type light source 2.

  As a result, in the second segment 32, the cross-border segment 30 between the reference dividing line 301 and the dividing line 302 crosses the first segment 31 side. The cross-border segment 30 forms a portion P0 on the opposite lane side indicated by a broken line in FIG. 4B in the second light collection pattern P2 formed by the second segment 32. When the cross-border segment 30 crosses the first segment 31 from the second segment 32, the opposite lane side portion P0 indicated by the broken line in FIG. It is distributed to the portion P0 indicated by the broken line in FIG. 4 (A) that is insufficient (see the solid line arrow from FIG. 4 (B) to FIG. 4 (A)).

  The plurality of third segments 33 emit light from a portion P30 of the first diffusion pattern P3 indicated by a broken line in FIG. 5A to the portion P0 of the second light collection pattern P2. To replenish. Similarly, the plurality of fourth segments 34 emit light from a portion P40 indicated by a broken line in FIG. 5B in the second diffusion pattern P4, and the second condensing pattern P2. Refill part P0.

(Description of heat sink member 4)
The heat sink member 4 is composed of a horizontal plate portion 40 and a plurality of fin-shaped vertical plate portions 41. The heat sink member 4 radiates heat generated in the semiconductor light source 2 to the outside. The semiconductor light source 2 and the reflector 3 are fixed to the heat sink member 4.

(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 unit 20 of the semiconductor light source 2 is turned on. Then, the light emitted from the light emitting unit 20 of the semiconductor-type light source 2 enters the segments 30 to 34 of the reflecting surface 300 of the reflector 3 and is reflected by the segments 30 to 34. This reflected light is irradiated in front of the vehicle as light distribution patterns P1 to P4, P0, P30, and P40 of predetermined portions. Light distribution patterns P1 to P4, P0, P30, and P40 of predetermined portions are superimposed (synthesized) to form a low beam light distribution pattern LP.

(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.

  In the vehicle headlamp 1 according to this embodiment, a vertical dividing line 302 that divides the first segment 31 and the second segment 32 of the two condensing pattern forming segments left and right is defined with respect to the reference dividing line 301. Thus, the border extends from the first segment 31 side to the second segment 32 side. For this reason, the reflective surface of the first segment 31 can be increased by the cross-border segment 30 where the vertical dividing line 302 crosses the second segment 32 side. With this increased reflection surface, it is possible to increase the light irradiated to the portion P0 of the predetermined point of the first light collection pattern P1 where the luminous intensity (illuminance, light amount) is insufficient. As a result, even if the first segment 31 and the second segment 32 of the two condensing pattern forming segments are divided into left and right, the light intensity (illuminance, light amount) of the portion P0 of the predetermined point of the first condensing pattern P1. ) Can be fully satisfied. Thereby, the visibility of a distant place is improved. In this embodiment, the far visibility on the traveling lane side is improved.

  In the vehicle headlamp 1 in this embodiment, since the dividing line 302 is a curved line, no step is generated between the first segment 31 and the second segment 32. Thereby, the optical loss by generation | occurrence | production of a level | step difference can be prevented.

  In the vehicle headlamp 1 in this embodiment, the dividing line 302 crosses from the first segment 31 side to the second segment 32 side at a location away from the semiconductor light source 2. For this reason, the reflection image of the light emitting surface of the semiconductor-type light source 2 in the transboundary segment 30 is small. Thereby, the reflection image of the small light emitting surface can be irradiated to a predetermined point portion P0 of the first light collection pattern P1 having insufficient light intensity (illuminance, light amount). In particular, it becomes easy to irradiate along a reflected image oblique cut-off line CL1 of a small light emitting surface.

(Description of example other than embodiment)
In addition, in the said embodiment, the vehicle headlamp 1 which irradiates the light distribution pattern LP for low beams is demonstrated. However, in the present invention, a vehicle headlamp that emits a light distribution pattern other than the low beam light distribution pattern LP, such as a high beam light distribution pattern, a highway light distribution pattern, a fog lamp light distribution pattern, etc. Can also be used.

  Moreover, in the said embodiment, the case of left side driving | running is demonstrated. However, the present invention can also be applied to right-side traveling. In this case, the segments and light distribution patterns are reversed left and right.

  Furthermore, in the said embodiment, the light emission surface of the light emission part 20 of the semiconductor type light source 2 has faced down. However, in the present invention, the light emitting surface of the light emitting unit 20 of the semiconductor light source 2 may face the upper side, the left side, or the right side. In this case, the reflecting surface 30 of the reflector 3 (3L, 3R) is opposed to the light emitting surface of the light emitting unit 20 of the semiconductor-type light source 2 facing the upper side, the left side, or the right side.

DESCRIPTION OF SYMBOLS 1 Vehicle headlamp 2 Semiconductor type light source 20 Light emission part 21 Board | substrate 3 Reflector 30 Cross-border segment 31 1st segment 32 2nd segment 33 3rd segment 34 4th segment 300 Reflecting surface 301 Reference dividing line 302 Dividing line 4 Heat sink member 40 Horizontal plate portion 41 Vertical plate portion HL-HR Horizontal lines on the left and right sides of the screen VU-VD Vertical lines on the upper and lower sides of the screen LP Low beam light distribution pattern CL1 Oblique cut-off line CL2 Horizontal cut-off line E Elbow point P1 First condensing pattern P2 Second Condensing pattern P3 First diffusion pattern P4 Second diffusion pattern P0, P30, P40 Part F Reference focus O Center of light emitting surface

Claims (1)

A semiconductor light source;
A reflector having a reflecting surface for reflecting light from the semiconductor-type light source as a predetermined light distribution pattern;
With
The reflective surface is composed of a plurality of segments,
The plurality of segments include two light-collecting pattern forming segments that form the light-condensing pattern of the light distribution pattern, and a plurality of diffusion pattern-forming segments that form the diffusion pattern of the light distribution pattern. Become
The two condensing pattern forming segments are adjacent to each other and divided by a vertical dividing line,
The dividing line is a curved line, and crosses the reference dividing line from the one condensing pattern forming segment side to the other condensing pattern forming segment side at a position away from the semiconductor-type light source. and it is,
The horizontal width of the one light-condensing pattern forming segment and the horizontal width of the other light-condensing pattern forming segment are separated from the semiconductor-type light source from an end near the semiconductor-type light source. Get bigger as you go to the edge,
A vehicle headlamp characterized by that.

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