JP2014007106A - Lamp for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp for a vehicle that is effective in heat countermeasure for a light emitting element 32 by making a printed wiring board 60 and a shade 52 function as a heat sink.SOLUTION: There is provided with a lamp for a vehicle obtained by uniting a light emitting element 32, a reflector 34R, and a shade 52 together as a lamp unit 30R1 and housing it in a lamp room S, heat generated when the light emitting element 32 illuminates being radiated to the space of the lamp room S through the printed wiring board 60 and shade 52 by mounting the light emitting element 32 on the printed wiring board 60 fixed to the reflector 34R and attaching the shade 52 to the printed wiring board 60. The lamp unit 30R1 need not be provided with a heat sink additionally, and the constitution of the lamp unit 30R1 becomes simple. The lamp room S is made short in depth, so the lamp 10 can be made compact in the front-rear direction.

Description

  The present invention relates to a vehicular lamp that forms a predetermined light distribution by reflecting light emitted from a light-emitting element as a light source, and more particularly to a vehicular lamp provided with a shade for preventing glare in the vicinity of the light-emitting element.

  In recent years, automotive headlamps tend to use light-emitting elements as light sources, and motorcycle headlamps have a similar tendency. (Lighting) is known.

  In Patent Document 1, a light emitting element as a light source and a reflector corresponding to the light emitting element are arranged on the front side of a long metal bracket disposed in a lamp chamber defined by a lamp body and a front cover. There is described a multi-lamp type two-wheeled vehicle headlamp in which a plurality of lamp units each composed of a light emitting element and a reflector are arranged adjacent to each other on the left and right sides of the lamp chamber by being attached so as to be adjacent to each other in the direction.

  In addition, the light emitting element generates a large amount of heat when converting electricity into light. This heat generation lowers the conversion efficiency from electricity to light and falls into a vicious cycle of generating heat. Therefore, in order to increase the brightness of the light emitting element, it is necessary to diffuse the generated heat.

  For this reason, the heat sink for radiating the heat | fever which generate | occur | produces at the time of light emitting element lighting to the lamp chamber is closely_contact | adhered and fixed to the back side of metal brackets.

JP 2008-222178 A (paragraphs 0025 to 0032, FIG. 1)

  However, in the above-mentioned Patent Document 1, there is a first problem that the structure of the lamp unit is complicated by providing the heat sink in the lamp unit.

  In addition, it is necessary to separate the lamp unit (metal bracket) from the back wall of the lamp chamber by the amount that the heat sink protrudes greatly on the back side of the lamp unit (metal bracket). That is, there is also a second problem that the lamp chamber is expanded in the depth direction by an amount corresponding to the protrusion amount of the heat sink to the rear of the lamp unit (metal bracket).

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a vehicle effective as a heat countermeasure for a light emitting element by providing a printed wiring board and a shade with a heat sink function instead of a heat sink. It is to provide a lighting fixture.

In order to solve the above problems, in the present invention (Claim 1), a light emitting element as a light source, a reflector for reflecting light emitted from the light emitting element toward the front of the lamp chamber, and a vicinity of the light emitting element are disposed in the lamp chamber. In a vehicular lamp that houses a lamp unit in which the shade is integrated,
The light emitting element is mounted on a printed wiring board fixed to the reflector, the shade is attached to the printed wiring board, and heat generated in the light emitting element is supplied to the lamp chamber via the printed wiring board and the shade. It was configured to dissipate heat into the space.
(Operation) The light emitted from the light emitting element is reflected in front of the lamp chamber by the effective reflecting surface of the reflector, thereby forming a predetermined light distribution. Then, the shade blocks out the light emitted from the light emitting element toward the portion other than the effective reflection surface of the reflector, thereby preventing the occurrence of glare.

  In addition, the light emitting element generates a large amount of heat when it is turned on, but this heat generation lowers the conversion efficiency from electricity to light, and further falls into a vicious circle of generating heat, resulting in a decrease in luminance and the life of the light emitting element. May decrease.

  However, since the heat generated when the light emitting element is turned on is radiated to the lamp chamber space via the printed wiring board and the shade, the light emitting element is not affected by the heat generated when the light emitting element is turned on.

  That is, since the printed wiring board and the shade function as a heat sink, it is not necessary to provide a separate heat sink in the lamp unit. As a result, first, the configuration of the lamp unit is simplified because the heat sink is omitted.

  Secondly, the depth of the lamp chamber can be made compact as much as the size of the lamp unit in the front-rear direction is reduced.

According to a second aspect of the present invention, in the vehicular lamp according to the first aspect, the shade is in close contact with the conductive pattern of the printed wiring board via an insulating thin film.
(Operation) Various conductive parts constituting a control circuit for controlling the lighting of the light emitting element are mounted on the conductive pattern (metal layer having excellent conductivity such as copper) provided on the printed wiring board. Since the conductive pattern is excellent in heat transfer, the printed wiring board itself has a heat radiation action to the lamp chamber space.

  In addition, when the shade is in close contact with the conductive pattern of the printed wiring board via the insulating thin film, the heat on the conductive pattern side, which is a heat transfer path, is transferred to the shade via the insulating thin film, and the shade is passed through the printed wiring board and the shade. The heat radiation action to the lamp room space is promoted.

According to a third aspect of the present invention, in the vehicular lamp according to the first or second aspect, the front edge of the effective reflecting surface of the reflector is positioned on an extension line connecting the light emission center of the light emitting element and the tip of the shade. Configured.
(Operation) Since the region to the front edge of the effective reflection surface of the reflector contributes to the formation of a predetermined light distribution of the lamp unit, the effective reflection surface of the reflector can be effectively used without waste.

According to a fourth aspect of the present invention, in the vehicular lamp according to the third aspect, the light emitting element is disposed downward on a lower surface side of the printed wiring board that may be disposed substantially horizontally, and is provided at a front edge of the effective reflection surface of the reflector. The extension subjected to the diffusion treatment was integrally formed.
(Operation) For example, when the light emitting element is arranged upward, the light emitting element in the lamp compartment is in a position where it can be directly viewed by the driver or pedestrian in the oncoming vehicle, so that the lamp compartment does not look good and direct glare occurs. In order to block the light, it is necessary to provide a large shade for preventing glare, and the appearance of the lamp chamber is even worse.

  However, in claim 4, since the light emitting elements are disposed downward on the lower surface side of the printed wiring board disposed substantially horizontally, firstly, the light emitting elements in the lamp chamber are connected to the driver of the oncoming vehicle via the translucent cover. It is less likely to be seen directly by pedestrians, and the lamp room looks better.

  Secondly, since there is little direct light that causes glare for drivers and pedestrians of oncoming vehicles, the glare prevention shade is compact, and the appearance of the lamp compartment does not deteriorate.

  The extension is intended to hide the gap around the lamp unit in the lamp chamber and improve the appearance of the lamp chamber through the front of the lamp. By forming the extension integrally with the reflector, The number of components can be reduced.

  The light reflected by the extension is obliquely upward in the front of the lamp chamber, but is not diffusely reflected by the diffusion processing surface, so that it does not become glare light.

According to a fifth aspect of the present invention, in the vehicular lamp according to the fourth aspect of the present invention, unevenness that increases the heat radiation area is provided on the lower surface side of the shade.
(Operation) Due to the unevenness provided on the lower surface of the shade, the heat radiation area in the shade with respect to the lamp chamber space is increased, and the heat radiation amount to the lamp chamber space through the shade is increased.

  According to the present invention (Claim 1), since the printed wiring board and the shade function as a heat sink, it is possible to provide a vehicular lamp in which the light emitting element is not affected by heat without providing a separate heat sink.

  Further, since the configuration of the lamp unit is simplified because the heat sink is not separately provided in the lamp unit, the configuration of the lamp can be simplified.

  Moreover, since the depth of the lamp chamber is reduced, the size of the lamp can be reduced in the front-rear direction.

  According to the second aspect, since the heat radiation action to the lamp chamber space through the printed wiring board and the shade is promoted, it is possible to provide a vehicular lamp in which the light emitting element is not further affected by heat.

  According to the third aspect, since the effective reflecting surface of the reflector can be utilized to the maximum extent, the lamp unit can be downsized, the lamp chamber can be downsized, and the lamp can be downsized by downsizing the reflector.

  According to the fourth aspect of the present invention, it is possible to provide a vehicular lamp that has a simple structure, does not generate glare, and has a good appearance in the lamp chamber.

  According to the fifth aspect, since the heat radiation amount to the lamp chamber space through the shade increases, it is possible to provide a vehicular lamp in which the light emitting element is not further affected by heat.

1 is a front view of a motorcycle headlamp according to a first embodiment of the present invention. It is a longitudinal cross-sectional view (cross-sectional view in alignment with line II-II of FIG. 1) of the headlamp. It is a longitudinal cross-sectional view (cross-sectional view which follows the line III-III of FIG. 1) of the headlamp. It is a disassembled perspective view of the reflector, the printed wiring board, and the shade which are the principal parts of the headlamp. It is an enlarged longitudinal cross-sectional view which shows the junction part of a printed wiring board and a shade. It is a longitudinal cross-sectional view (cross-sectional view corresponding to FIG. 2) of the motorcycle headlamp which is the 2nd Example of this invention.

  Next, embodiments of the present invention will be described based on examples. 1 to 5 show a first embodiment in which the present invention is applied to a motorcycle headlamp.

  In these drawings, particularly FIGS. 1, 2 and 3, the motorcycle headlamp 10 is formed by a lamp body 12 and a transparent front cover 14 attached to the front end opening of the lamp body 12. In the lamp chamber S, four lamp units 30R1, 30R2, 30L1, and 30L2 for forming a low beam and two lamp units 40R and 40L for forming a high beam are accommodated in a state of being arranged in a line in the vehicle width direction. It is configured.

  Specifically, of the four lamp units 30R1, 30R2, 30L1, and 30L2 for forming the low beam, the lamp unit 30R1 and 30L1 is disposed at the center in the vehicle width direction of the lamp chamber S, and is positioned at the end of the lamp chamber S in the vehicle width direction. The lamp units 30R2 and 30L2 are arranged, and the high beam forming lamp unit 40R (40L) is arranged between the low beam forming lamp units 30R1 and 30R2 (30L1 and 30L2).

  Then, the light distribution patterns formed by the low beam forming lamp units 30R1, 30R2, 30L1, and 30L2 are combined to form a low beam light distribution, and the low beam forming lamp units 30R1, 30R2, 30L1, and 30L2 are formed. Are combined with the light distribution patterns formed by the high beam forming lamp units 40R and 40L, respectively, to form a high beam light distribution.

  In addition, the low beam forming lamp units 30R1, 30L1, 30R2, and 30L2 all reflect the light emitted from the light emitting element 32 that is a light source and the light emitting element 32 toward the front of the lamp chamber S, and the reflectors 34R1, 34L1, 34R2, and 34L2. And a glare prevention shade (main body) 52 disposed in the vicinity of the light emitting element 32.

  On the other hand, the high beam forming lamp units 40R and 40L are provided with the light emitting element 32 that is a light source and the reflectors 44R and 44L that reflect the light emitted from the light emitting element 32 toward the front of the lamp chamber S. The shade 52 is not provided.

  As shown in FIG. 4, the reflectors 34R1, 34L1, 44R, 44L, 34R2, and 34L2 are integrated as a reflector unit 16, that is, the lamp units 30R1, 30R2, 40R, 40L, 30L1, and 30L2 are reflector units. 16, and is cantilevered by an aiming mechanism (not shown) interposed between the back wall of the lamp body 12 and the reflector unit 16.

  Specifically, the aiming mechanism includes a pair of left and right pivots that extend from the lamp body rear wall to the front in the lamp chamber S, and a pair of left and right pivots that are respectively attached to the rear side of the reflector unit 16 and engage with the pivots. A pivot receiving portion, an aiming screw rotatably supported on the rear wall of the lamp body below the pair of left and right pivot positions and extending forward in the lamp chamber S; and attached to the rear side of the reflector unit 16; The reflector unit 16 is composed of a nut member that engages the aiming screw. By rotating the aiming screw, the reflector unit 16 is disposed around a horizontal tilting axis that passes through a pair of left and right tilting fulcrums configured by a pivot and a pivot receiving portion. By tilting in the vertical direction, the optical axis of the headlamp 10 (six lamp units 30R1, 30L1, 40R, 40L, A common optical axis) of 0R2,30L2 be tilted adjusted vertically.

  On the upper surface of the flat plate-like rear extension 17 of the reflector unit 16, as shown in FIGS. 2, 3, and 4, the light emitting element 32 formed of a white light emitting diode is on the lower surface side, and the lighting control circuit 68 is on the upper surface. A printed wiring board 60 mounted on each side is fixed and integrated by a tapping screw 66. The six light emitting elements 32 mounted on the lower surface side of the printed circuit board 60 are substantially parabolic surfaces of the reflectors 34R1, 34L1, 44R, 44L, 34R2, and 34L2, as shown in FIGS. The effective reflecting surfaces 35R1, 35L1, 45R, 45L, 35R2, and 35L2 are disposed downward at positions corresponding to the respective focal points. 2 and 3, reference numeral 18 denotes a vehicle body.

  The effective reflection surfaces 35R1, 35L1, 45R, 45L, 35R2, and 35L2 are all configured by a plurality of step reflection surfaces (see FIGS. 1 and 4), and the light emission of the light emitting element 32 is effective reflection surfaces 35R1, 35L1, and 45R. , 45L, 35R2, and 35L2 are reflected in a predetermined forward direction to form a desired light distribution pattern.

  Further, as shown in FIGS. 2 and 3, a metal shade component member 50 having excellent heat transfer properties is provided on a lower surface side of the horizontally disposed printed wiring board 60 with predetermined fixing means (tapping screw, lance fastening). , Bonding, etc.).

  The shade constituent member 50 is formed in a rectangular plate shape having the same length in the left-right direction as the printed wiring board 60, and corresponds to the low beam forming reflectors 34R1, 34L1, 34R2, and 34L2 at the rear side edge of the shade constituent member 50. At predetermined positions, shade main bodies 52 (52R1, 52L1, 52R2, and 52L2) each having an L-shaped longitudinal section disposed in the vicinity of the light emitting element 32 are formed to protrude.

  The tips 53R1, 53L1, 53R2, and 53L2 of the shade main bodies 52R1, 52L1, 52R2, and 52L2 are the front edges 36R1, 36L1, 36R2, and 36L2 of the effective reflecting surfaces 35R1, 35L1, 35R2, and 35L2 of the reflectors 34R1, 34L1, 34R2, and 34L2. As shown in FIGS. 2 and 5, the reflector is formed on an extension line L connecting the light emission center O of the light emitting element 32 and the shade main body tip 53R1 (53L1, 53R2, 53L2) as shown in FIGS. The leading edge 36R1 (36L1, 36R2, 36L2) of the effective reflecting surface 35R1 (35L1, 35R2, 35L2) is located.

  For this reason, the area to the front edge 36R1 (36L1, 36R2, 36L2) of the effective reflecting surface 35R1 (35L1, 35R2, 35L2) of the reflector is used to form a predetermined light distribution of the lamp unit 30R1 (30L1, 30R2, 30L2). This contributes to the effective use of the reflector's effective reflection surface 35R1 (35L1, 35R2, 35L2) without any waste.

  In front of the lamp units 30R1, 30L1, 40R, 40L, 30R2, and 30L2, as shown in FIGS. 2 and 3, an extension member 20 that surrounds each of the lamp units 30R1, 30L1, 40R, 40L, 30R2, and 30L2, for example, It is arranged by being fixed to the front cover 14 with screws.

  Further, as shown in FIGS. 2, 3, and 4, the reflectors 34R1, 34L1, 44R, 44R, 44L, 34R2, and 34L2 have effective reflectors 35R1, 35L1, 45R, 45L, 35R2, and 35L2. Extensions 37R1, 37L1, 47R, 47L, 37R2, and 37L2 formed integrally with 34L1, 44R, 44L, 34R2, and 34L2 extend forward to the front of the lamp units 30R1, 30L1, 40R, 40L, 30R2, and 30L2. In cooperation with the extension member 20 disposed in the front, the gap between the lamp units 30R1, 30L1, 40R, 40L, 30R2, 30L2 and the front cover 14 is hidden.

  In particular, in the lamp unit 30R1 (30L1, 30R2, 30L2) for forming a low beam, the light emitted from the light emitting element 32 and traveling forward from the front edge 36R1 (36L1, 36R2, 36L2) of the effective reflecting surface of the reflector is shade body. Since 52R1 (52L1, 52R2, 52L2) is reliably shielded from light, glare is not generated by the reflected light of the extension 37R1 (37L1, 37R2, 37L2). In particular, the surface of the extension 37R1 (37L1, 37R2, 37L2) is subjected to a diffusion process such as embossing, so even if light is reflected upward by the extension 37R1 (37L1, 37R2, 37L2). There is no glare.

  In addition, in the lamp units 30R1, 30L1, 40R, 40L, 30R2, and 30L2, the printed circuit board 60 and the shade constituent member 50 are used as heat sinks, so that the light emitting element 32 is protected against heat.

  That is, the light emitting element 32 generates a large amount of heat when it is turned on, but this heat generation reduces the conversion efficiency from electricity to light, and further falls into a vicious circle of generating heat, resulting in a decrease in luminance. Life may be reduced.

  However, since the heat generated when the light emitting element 32 is turned on is radiated to the lamp chamber S space via the printed wiring board 60 and the shade constituent member 50, the influence of the heat generated when the light emitting element 32 is turned on is affected. I will not receive it.

  Specifically, as shown in an enlarged view in FIG. 5, the printed wiring board 60 extends along both the front and back surfaces of an insulating base 61 in which a conductive pattern 62 that functions as a current path to the light emitting element 32 and the like is made of resin or the like. Since it is disposed and has excellent heat transfer properties, the printed wiring board 60 itself has a heat radiation action to the lamp chamber S space. Moreover, the shade structural member 50 comprised with the metal is also excellent in heat transferability, and has the thermal radiation effect | action to the lamp chamber S space.

  In particular, the shade constituent member 50 is in close contact with the conductive pattern 62 of the printed wiring board 60 through the insulating thin film 63 made of resin, so that the heat on the conductive pattern 62 side, which is the main heat transfer path in the printed wiring board 60, is insulated. Since the light is smoothly transmitted to the shade constituent member 50 through 63, the heat radiation action to the lamp chamber S space through the printed wiring board 60 and the shade constituent member 50 is promoted. In FIG. 5, reference numeral 64 denotes a conductive path connecting the conductive pattern 62 on the upper surface side of the printed wiring board 60 and the conductive pattern 62 on the lower surface side, and is disposed in a through hole H provided in the printed wiring board 60. Has been.

  Further, the lower surface side of the shade constituent member 50 is configured by the sandblasted uneven surface 51, and the heat radiation area in the shade constituent member 50 with respect to the lamp chamber S space is increased, so that the lamp chamber S via the shade constituent member 50 is increased. The amount of heat released to the space is increased.

  Further, as shown in FIGS. 2, 3, and 4, the shade constituent member 50 extends to the vicinity of the front cover 14, and heat generated in the light emitting element 32 is transmitted through the shade constituent member 50 to the front surface in the lamp chamber S. Dissipating heat to the vicinity of the cover 14 is effective in melting snow adhering to the front cover 14.

  That is, since the light emitted from the light emitting element 32 does not include infrared rays, there is a possibility that snow attached to the front cover 14 may freeze in a cold region with a lot of snow, and the original light distribution of the headlamp may not be obtained. In the embodiment, it is possible to expect a snow melting effect due to the heat radiation action of the shade constituent member 50 extending to the vicinity of the front cover 14.

  In the present embodiment, since the light emitting element 32 is disposed downward on the lower surface side of the printed wiring board 60 disposed substantially horizontally, the following effects are exhibited.

  First, the light emitting element 32 in the lamp chamber S is less likely to be directly viewed by the driver or pedestrian in the oncoming vehicle through the front cover 14, and the lamp chamber S looks better.

  Secondly, since no upward direct light that causes glare to the driver or pedestrian of the oncoming vehicle is generated, the shade main body 52 protruding to the lower surface side of the printed wiring board 60 may be compact, and the appearance in the lamp chamber S is good. It does not decrease

  FIG. 6 shows a motorcycle headlamp according to a second embodiment of the present invention, and is a view corresponding to FIG. 2 showing a longitudinal section of the headlamp of the first embodiment.

  In the above-described headlamp 10 of the first embodiment, the printed wiring board 60 and the shade constituent member 50 have a heat sink function so that the lamp units 30R1, 30L1, 40R, 40L, 30R2, and 30L2 are not provided with a heat sink. However, the headlamp 10A of the second embodiment has a structure in which a heat sink 58 is provided on the lower surface side of the shade constituting member 50.

  Since the heat generated when the light emitting element 32 is turned on is dissipated from the heat sink 58 of the shade component 50 to the lamp chamber S space, the light emitting element 32 is generated when the light emitting element 32 is turned on as compared with the first embodiment. Less susceptible to heat.

  Further, since the heat sink 58 is provided on the lower surface side of the shade constituent member 50 and does not protrude rearward of the lamp unit as seen in the prior patent document 1, it is not necessary to increase the depth of the lamp chamber S.

  In the first embodiment described above, the extension units 20 separate from the reflectors 34R1, 34L1, 44R, 44L, 34R2, and 34L2 are fixed to the front cover 14, so that the lamp units 30R1, 30L1, 40R, 40L, Although the extension member 20 is disposed in front of 30R2 and 30L2, in this second embodiment, the extension member 20A together with the extension 37R1 (37L1, 37R2, 37L2) is the reflector 34R1 (34L1, 44R, 44L, 34R2, 34L2). ).

  That is, since the reflector unit 16 and the extension member 20A are integrally formed, the number of parts constituting the headlamp 10A is reduced accordingly, and the configuration of the headlamp 10A is simplified.

  Others are the same as those in the first embodiment, and therefore, the same reference numerals are given to omit redundant description.

  In the first and second embodiments described above, the shade constituent member 50 is made of a metal having excellent heat conductivity. However, the shade member 50 is not limited to metal, and is made of ceramic having excellent heat conductivity. It may be configured.

DESCRIPTION OF SYMBOLS 10,10A Motorcycle headlamp 12 Lamp body 14 Front cover S Lamp chamber 30R1, 30L1, 30R2, 30L2 Lamp unit 32 for low beam formation Light emitting element O as light source Light emitting centers 34R1, 34L1, 44R, 44L, 34R2, 34L2 Reflector 35R1, 35L1, 45R, 45L, 35R2, 35L2 Reflector Effective Reflecting Surface 35R1, 35L1, 35R2, 35L2 Effective Reflecting Surface Leading Edges 37R1, 37L1, 47R, 47L, 37R2, 37L2 Extension 40R, 40L Lamp unit 50 Shade constituent member 51 Concave and convex surface 52 (52R1, 52L1, 52R2, 52L2) for increasing the heat radiation area Shade body 53R1, 53L1, 53R2, 53L2 Shade body tip L Light emission center and shade Extension 58 heat sink 60 printed circuit board 61 insulative base 62 conductive pattern 63 insulating film 68 lighting control circuit connecting the body tip

Claims (5)

In the lamp chamber,
In a vehicular lamp that houses a light emitting element that is a light source, a reflector that reflects light emitted from the light emitting element toward the front of a lamp chamber, and a lamp unit that is integrated with a shade disposed in the vicinity of the light emitting element.
The light emitting element is mounted on a printed circuit board fixed to the reflector,
The shade is attached to the printed wiring board, and the heat generated in the light emitting element is radiated to the lamp chamber space through the printed wiring board and the shade. Lamps.   The vehicular lamp according to claim 1, wherein the shade is in close contact with the conductive pattern of the printed wiring board via an insulating thin film.   3. The vehicular lamp according to claim 1, wherein a front edge of an effective reflection surface of the reflector is positioned on an extension line connecting a light emission center of the light emitting element and the tip of the shade. 4. .   The light emitting element is disposed downward on the lower surface side of the printed wiring board disposed substantially horizontally, and a diffusion-treated extension is integrally formed on the front edge of the effective reflecting surface of the reflector. The vehicular lamp according to claim 3.   The vehicular lamp according to claim 4, wherein unevenness that increases a heat radiation area is provided on a lower surface side of the shade.

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