JP2017076522A - Light source unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source unit which can improve the stiffness and rigidity of a reflector, can improve the heat dissipation performance of a baseboard and an LED, and can perform the cabling of a chord by effectively using a space.SOLUTION: In a light source unit 1 comprising a reflector 2 having a plurality of reflection faces 2a which are partitioned by vertical walls 2A, a plurality of LEDs which are arranged in response to the reflection faces 2a of the reflector 2, and a plurality of baseboards 3 on which the LEDs are amounted, the baseboards 3 are attached to a ceiling plate 2B of the reflector 2, and chords 5 extending from a power supply are connected to the baseboards 3 via connectors 6. Reinforcing ribs 2D are integrally formed at positions corresponding to the vertical walls 2A of the ceiling plate 2B of the reflector 2, a recess 2c is formed at a point of the ceiling plate 2B to which the baseboards 3 are attached, a heat dissipation space S is formed between the ceiling plate 2B and the baseboards 3, a plurality of the connectors 6 are connected to one another in series by the chords 5, and a part of the connectors 6 is attached to the reflector 2 by a clip 7.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light source unit including a reflector having a plurality of reflecting surfaces that reflect light emitted from a plurality of LEDs (light emitting diodes).

  Vehicle headlamps arranged on the left and right of the front part of a vehicle use a light source unit including a plurality of LEDs that are light sources and a reflector having a plurality of reflecting surfaces that reflect light emitted from each LED. Yes (see, for example, Patent Documents 1 to 3), such a vehicle headlamp can ensure a wide light emitting area.

  Here, the prior art example of the light source unit used for such a vehicle headlamp is shown in FIG.

  That is, FIG. 7 is a front perspective view of a conventional light source unit. The illustrated light source unit 101 includes a reflector 102 including a plurality of (six in the illustrated example) reflecting surfaces 102a defined by vertical walls 102A; A plurality of LEDs (not shown) provided corresponding to the respective reflecting surfaces 102a of the reflector 102 and a plurality of substrates 103 (only three are shown in FIG. 7) for mounting the LEDs are provided. In addition to being attached to the top plate 102B on the upper surface of the reflector 102, a cord 105 extending from a power source (not shown) such as a battery is connected to each of the substrates 103. Here, each LED is mounted on the lower surface of each substrate 103 so that the light emission direction is downward, and the light emitted downward from each LED is reflected by each reflection surface 102a of the reflector 102. The light is emitted forward of the vehicle.

JP2015-138734A Japanese Patent Laying-Open No. 2015-138936 JP-A-2015-138737

  However, in the conventional light source unit 101 shown in FIG. 7, if a reinforcing rib is set in order to increase the rigidity and strength of the reflector 102, the reinforcing rib becomes a sink mark on the reflecting surface 102a at the time of injection molding with resin of the reflector 102. Therefore, the reinforcing rib cannot be set, and there arises a problem that the strength and rigidity of the reflector 102 cannot be provided.

  In addition, since each substrate 103 is mounted on the flat top plate 102B of the reflector 102, there is no heat escape path between each substrate 103 and the top plate 102B of the reflector 102, and the heat dissipation of each substrate 103 is improved. There is also a problem that the temperature of each LED increases and the luminous efficiency and lifetime of the LED decrease.

  Furthermore, since each cord 105 for supplying power to each LED from the battery extends to the back side of the reflector 102, each cord 105 occupies useless space, and the light source unit 101 and a vehicle including the same There was also the problem that the lighting fixtures were enlarged.

  The present invention has been made in view of the above-mentioned problems, and the objectives thereof are a light source capable of improving the rigidity and strength of the reflector, improving the heat dissipation of the LED, and arranging the cord effectively using the space. To provide a unit.

In order to achieve the above object, the invention according to claim 1 is a reflector including a plurality of reflecting surfaces partitioned by vertical walls, a plurality of LEDs provided corresponding to each reflecting surface of the reflector, and each LED. In a light source unit comprising a plurality of substrates for mounting, and attaching each substrate to the top plate of the reflector, and connecting a cord extending from a power source to each substrate via a connector,
A reinforcing rib is integrally formed at a position corresponding to each vertical wall of the top plate of the reflector, and a concave portion is formed at a position where each substrate of the top plate is attached, so that the top plate and each substrate are between them. Each heat dissipation space is formed,
A plurality of the connectors are connected in a row by the cord, and some connectors are attached to the reflector by clips.

  According to a second aspect of the present invention, in the first aspect of the present invention, a vent is formed in a recess formed in the top plate of the reflector.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the clip is provided on one of adjacent ones of the plurality of connectors, and the clip is fitted into a hole formed in the top plate of the reflector. It is characterized by being attached by inserting.

  According to the first aspect of the present invention, the reinforcing ribs are integrally formed at positions corresponding to the vertical walls of the top plate of the reflector, that is, at positions where sink marks are not generated on each reflecting surface during injection molding with the resin of the reflector. Therefore, the strength and rigidity of the reflector can be increased by the reinforcing ribs without causing sink marks on the reflecting surface, and allowance can be given to the strength and rigidity of the reflector.

  In addition, since a recess is formed at the location where each substrate of the top plate of the reflector is attached and a heat radiation space is formed between the top plate and each substrate, the heat conducted from each LED to each substrate passes through the heat radiation space. Spread around. For this reason, the heat dissipation of each LED and each substrate is enhanced, and the temperature rise of each LED is suppressed low, and the light emission efficiency and lifetime of the LED are prevented from decreasing.

  Furthermore, since a plurality of connectors are connected to each other by a cord and a part of the connectors are attached to the reflector by a clip, the cord is arranged compactly and does not occupy useless space. It is possible to reduce the size of the vehicular lamp provided.

  According to the second aspect of the present invention, since the vent hole is formed in the recess formed in the top plate of the reflector, the hot air between the top plate and each substrate passes through the vent hole and is released to the outside. For this reason, the heat dissipation of each LED and each board | substrate is further improved, the temperature rise of each LED is suppressed effectively, and the fall of the luminous efficiency and lifetime of each LED is prevented more reliably.

  According to the invention described in claim 3, since the clips are provided alternately (every other) with respect to the plurality of connectors, and the clips are attached by being fitted into the holes formed in the top plate of the reflector. The cords can be fixed to the reflector by half of the clips, simplifying the cord routing work and reducing the work man-hours.

It is a front side perspective view of the light source unit which concerns on this invention. It is the A section enlarged detail drawing of FIG. It is the BB sectional view taken on the line of FIG. It is a perspective view of the board | substrate of the light source unit which concerns on this invention. It is a figure which shows the attachment structure of the connector in the light source unit which concerns on this invention, Comprising: It is the disassembled perspective view which looked at the reflector from diagonally downward. It is a figure which shows the wiring structure of the cord in the light source unit which concerns on this invention, Comprising: It is a back side perspective view of a light source unit. It is a front side perspective view of the conventional light source unit.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a front perspective view of a light source unit according to the present invention, FIG. 2 is an enlarged detail view of a portion A in FIG. 1, FIG. 3 is a sectional view taken along line BB in FIG. FIG. 6 is a diagram showing a connector mounting structure in the light source unit according to the present invention, and is an exploded perspective view of the reflector as viewed obliquely from below; FIG. 6 is a diagram showing a cord routing structure in the light source unit; It is a back side perspective view of a unit.

  The light source unit 1 according to the present embodiment is for forming a low beam light distribution of headlamps arranged on the left and right of the front portion of the vehicle, and the basic configuration of the light source unit 1 provided in the left and right headlamps Are the same, only one light source unit 1 will be illustrated and described below.

  A light source unit 1 shown in FIG. 1 includes a reflector 2 that is integrally formed by injection molding of resin, and the reflector 2 includes six reflecting surfaces 2a that are partitioned by vertical walls 2A. Here, the six reflecting surfaces 2a are juxtaposed in the horizontal direction, and the surface is subjected to a reflection treatment such as aluminum vapor deposition.

  A total of six substrates 3 (only three are shown in FIG. 1) are attached to the flat top plate 2B integrally formed on the upper portion of the reflector 2, corresponding to each reflecting surface 2a. An LED as a light source is mounted on the lower surface of the substrate 3 so that the light emission direction is downward. Here, light transmitting windows 2b (only three are shown in FIG. 1) are formed at positions corresponding to the respective reflecting surfaces 2a of the top plate 2B of the reflector 2 to allow light emitted downward from the LEDs to pass therethrough. Has been. Each reflecting surface 2a of the reflector 2 forms a concave paraboloid with the position of the LED as a focal point.

  Here, the detail of the attachment structure to the reflector 2 of each board | substrate 3 is demonstrated based on FIGS.

  As shown in FIG. 4, a long hole-like screw insertion hole 3 a is formed at the center of each substrate 3, and circular positioning holes 3 b are formed at two positions on the left and right sides of the front side. Between these positioning holes 3b, circular caulking holes 3c are formed. A circular positioning hole 3d is formed at one central portion on the back side of each substrate 3.

  On the other hand, as shown in FIG. 2 and FIG. 3, a recess 2c is formed at a position where each substrate 3 of the top plate 2B of the reflector 2 is attached, and one recess (screw on the substrate 3) is formed. A cylindrical boss 2C is erected integrally at a position corresponding to the insertion hole 3a, and a screw hole 2d is formed at the center of the boss 2C. Further, in the vicinity of the boss 2C in the recess 2c, two rectangular vent holes 2e and one circular hole 2f are formed.

  Further, two positioning pins 2g are erected in the vicinity of the light transmitting windows 2b of the top plate 2B of the reflector 2 (two locations corresponding to the left and right positioning holes 3b of the substrate 3). A caulking pin 2h is erected at one location between the positioning pins 2g (one location corresponding to the caulking hole 3c of the substrate 3). A cylindrical receiving seat 2i is erected at two locations between the caulking pin 2b and the left and right positioning pins 2g.

  Further, positioning pins 2j are erected at one location on the back side of the top plate 2B of the reflector 2 (one location corresponding to the positioning hole 3d of the substrate 3), and two left and right locations in the vicinity of the positioning pin 2j. Are respectively provided with pin-shaped receiving seats 2k.

  Thus, each substrate 3 is fitted to the reflector 2 by fitting the positioning pins 2g and 2j erected on the top plate 2B of the reflector 2 into the positioning holes 3b and 3d formed therein, respectively. Are positioned accurately, and at the same time, the lower surface thereof is received by the receiving seats 2i and 2k on the reflector 2 side. At this time, as shown in FIG. 3, the caulking pin 2h on the reflector 2 side is inserted into the caulking hole 3c of each substrate 3, and the screw insertion hole 3a of the substrate 3 is inserted into the screw hole 2d of the boss 2C on the reflector 2 side. Match.

  Accordingly, as shown in FIG. 3, each substrate 3 is screwed into a screw hole 2 d formed in the boss 2 </ b> C on the reflector 2 side with a screw 4 inserted from above into a screw insertion hole 3 a formed in the substrate 3. The caulking pins 2h protruding upward from the caulking holes 3c are melted and caulked to be attached to locations corresponding to the reflecting surfaces 2a of the top plate 2B of the reflector 2. Thus, when the board | substrate 3 is attached to the reflector 2, the thermal radiation space S is formed between this board | substrate 3 and the top plate 2B of the reflector 2, and this thermal radiation space S is formed in the top plate 2B of the reflector 2. FIG. The air holes 2e and 2f communicate with the outside.

  Further, in the present embodiment, as shown in FIG. 2, the position corresponding to each vertical wall 2A (see FIG. 1) of the top plate 2B of the reflector 2, that is, each reflecting surface 2a at the time of injection molding by the resin of the reflector 2. Reinforcing ribs 2D are integrally formed at positions where no sink marks are generated.

  By the way, a current is supplied to the LEDs (not shown) mounted on the lower surface of each substrate 3 from a power source (not shown) such as a battery via the cord 5 and the connector 6 (see FIGS. 5 and 6). In the embodiment, a total of six connectors 6 respectively connected to the six substrates 3 are connected in a row by a cord 5, and a clip 7 is provided on one of the two adjacent connectors 6 (with respect to the six connectors 6). As shown in FIG. 5, the three clips 7 are attached by being fitted into the three holes 2m formed in the top plate 2B of the reflector 2 from below, as shown in FIG. I have to. Therefore, as shown in FIG. 6, the cord 5 is supported by the reflector 2 by the three clips 7, and this does not extend greatly to the back side of the reflector 2 and occupy a large space.

  As described above, in the light source unit 1 according to the present embodiment, the reinforcing rib 2D is positioned at a position corresponding to each vertical wall 2A of the top plate 2B of the reflector 2, that is, each reflection at the time of injection molding by the resin of the reflector 2. Since the surface 2a is integrally formed at a position where no sink marks are generated, the strength and rigidity of the reflector 2 are increased by the reinforcing ribs 2D without generating sink marks on the reflecting surfaces 2a. Can be afforded.

  Moreover, since the recessed part 2c was formed in the location where each board | substrate 3 of the top plate 2B of the reflector 2 was attached, respectively, and the thermal radiation space S was formed between the top plate 2B and each board | substrate 3, from each LED to each board | substrate 3 The conducted heat diffuses to the surroundings through the heat radiation space S. For this reason, the heat dissipation of each LED and each board | substrate 3 is improved, the temperature rise of each LED is suppressed low, and the fall of the luminous efficiency and lifetime of this LED are prevented. In particular, in the present embodiment, since the vent holes 2e and 2f are formed in the recess 2c formed in the top plate 2B of the reflector 2, hot air between the top plate 2B and each substrate 3 is transferred from the heat radiation space S to the vent hole 2e. , 2f and discharged to the outside. For this reason, the heat dissipation of LED and each board | substrate 3 is further improved, the temperature rise of each LED is suppressed effectively, and the fall of the luminous efficiency and lifetime of each LED is prevented more reliably.

  Furthermore, since the six connectors 6 are connected to each other by the cord 5 and the three connectors 6 are attached to the reflector 2 by the clip 7, the cord 5 is compactly routed and does not occupy useless space. The light source unit 1 and a vehicle lamp (not shown) including the light source unit 1 can be downsized. In this embodiment, three clips 7 are provided alternately (every other) for the six connectors 6, and these clips 7 are fitted into the holes 2m formed in the top plate 2B of the reflector 2. Therefore, the cord 5 can be fixed to the reflector 2 by the three clips 7 which are half of the six connectors 6, and the wiring work of the cord 5 is simplified and the number of work steps is reduced. can get.

  Although the present invention has been described with respect to a form in which the present invention is applied to a light source unit for forming a low-beam light distribution of a headlamp, the present invention is directed to a light source unit for forming a high-beam light distribution, Of course, the present invention can be similarly applied to a light source unit used for any vehicle lamp other than the headlamp.

DESCRIPTION OF SYMBOLS 1 Light source unit 2 Reflector 2A Reflector vertical wall 2B Reflector top plate 2D Reflector reinforcing rib 2a Reflector reflecting surface 2c Reflector recess 2e, 2f Reflector air vent 2m Reflector hole 3 Substrate 4 Screw 5 Cord 6 Connector 7 Clip S Heat dissipation space

Claims (3)

A reflector having a plurality of reflecting surfaces partitioned by vertical walls, a plurality of LEDs provided corresponding to each reflecting surface of the reflector, and a plurality of substrates on which each LED is mounted, each substrate being a part of the reflector In the light source unit that is attached to the top plate and connected to each of the substrates via a connector, a cord extending from the power source
A reinforcing rib is integrally formed at a position corresponding to each vertical wall of the top plate of the reflector, and a concave portion is formed at a position where each substrate of the top plate is attached, so that the top plate and each substrate are between them. Each heat dissipation space is formed,
A plurality of the connectors are connected in a row by the cord, and a part of the connectors is attached to the reflector by a clip.   The light source unit according to claim 1, wherein a vent hole is formed in a recess formed in the top plate of the reflector. 3. The light source according to claim 1, wherein the clip is provided on one of adjacent ones of the plurality of connectors, and the clip is attached by being fitted into a hole formed in the top plate of the reflector. unit.

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