JP2014120388A - Light source unit of lighting device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source unit of a lighting device for a vehicle which achieves excellent heat radiation performance, high luminance, and light distribution characteristics close to a bulb type light source, enables easy replacement, and uses a light emitting diode as a light source.SOLUTION: A light source unit of a lighting device for a vehicle includes: a bulb body 2 inserted into a lamp chamber 34 of the lighting device 30 for the vehicle; a substrate 10 made of a metal or a ceramic and attached to the bulb body 2; and LED light emitting elements 15 mounted on both main surfaces 10a, 10b of the substrate 10. Recessed parts 3, 4 are formed at the bulb body 2, and an attachment flat surface 5, with which the one main surface 10b of the substrate 10 contacts, is formed at the recessed part 4. An opening 7 which penetrates to the opposite side of the bulb body 2 is formed on the attachment flat surface 5, and the LED light emitting element 15 mounted on the main surface 10b is exposed from the opening 7. The structure improves heat radiation performance of the LED light emitting element 15, the luminous efficiency, the luminance, and the life. Further, the structure achieves light distribution characteristics close to those of a conventional bulb type light source.

Description

  The present invention relates to a light source unit for a vehicle lighting device, and more particularly to a light source unit for a vehicle lighting device using a light emitting diode as a light source.

  Conventionally, a light source unit 101 of a vehicular lamp 100 shown in FIG. 5 is known as a light source unit of this type of vehicle lighting device (for example, Patent Document 1).

  A conventional light source unit 101 shown in FIG. 5 includes a substrate 102 and light emitters 103 attached to both surfaces of the substrate 102. The light emitter 103 includes a light emitting diode (LED) 103a as a light source.

  A connection pattern 102 a connected to the light emitter 103 is formed on both surfaces of the substrate 102. The rear end portion of the substrate 102 is attached to the socket 104, and each connection pattern 102 a is connected to the connection terminal of the socket 104. The socket 104 is connected to the connector 5 connected to the power supply circuit. In addition, the socket 104 is attached to the attachment portion 112 of the reflector 110, whereby the substrate 102 and the light emitter 103 of the light source unit 101 are arranged inside the reflector 110.

  In such a configuration, a current is supplied from the power supply circuit to the light emitting diode 103a of the light emitter 3 through the connector 105, the socket 104, and the connection pattern 102a of the substrate 102, and light is emitted from the light emitting diode 103a.

  Further, as another example of the prior art, a sub-assembly member 220 of a vehicle headlamp unit 200 shown in FIG. 6 is known (for example, Patent Document 2).

  The vehicle headlamp unit 200 shown in FIG. 6 includes a first LED 208 and a second LED 209 that are disposed inside the reflector 205. The first LED 208 and the second LED 209 are attached to the front surface and the back surface of the horizontal plate 214a of the mounting plate 214 formed by connecting the horizontal plate 214a and the vertical plate 214b in a T shape to constitute the sub-assembly member 220. . Further, a heat radiating plate 213 is attached to the vertical plate 214b.

JP2011-129475A (page 5, FIG. 1) Japanese Patent No. 4289268 (page 6-8, FIG. 1)

  However, in the method of attaching LED light emitting elements (light emitting diodes 103a) serving as light sources on both surfaces of the substrate 102 as in the prior art shown in FIG. 5, the heat dissipation from the LED light emitting elements is poor, and the LED light emitting element portions are localized. However, there was a problem of high temperature. For this reason, even if the output of the LED light emitting element is increased, the luminous efficiency of the LED light emitting element is reduced due to overheating and the service life is shortened.

  In the method of attaching LED light emitting elements (first LED 208 and second LED 209) as light sources on both surfaces of the horizontal plate 214a as in the prior art shown in FIG. 6, the distance between the LED light emitting elements arranged on both surfaces is increased. However, there is a problem that the light distribution characteristics are significantly different from those of conventional bulb-type light sources such as halogen bulbs and incandescent bulbs. That is, since the position of the luminous body of the LED light source is different from the position of the filament of the conventional light bulb type light source, it cannot be used as a light source for replacement of a vehicle lighting device using the conventional light bulb type light source. Further, it is necessary to suitably design the arrangement of the LED light source and the shape of the reflector for each lighting device, and the design is complicated.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to emit light that is excellent in heat dissipation, can exhibit light distribution characteristics close to that of a light bulb type light source, and can be easily attached and replaced. An object of the present invention is to provide a light source unit for a vehicular lighting device using a diode as a light source.

  The light source unit of the vehicle lighting device according to the present invention includes a bulb main body inserted into the lamp chamber from the bulb insertion hole of the vehicle lighting device, a metal or ceramic substrate attached to the bulb main body, An LED light-emitting element mounted on both main surfaces, wherein a concave portion is formed in the valve body, a mounting plane for contacting one main surface of the substrate is formed in the concave portion, and the valve main body is formed on the mounting plane. An opening that penetrates to the opposite side is formed, and the LED light emitting element mounted on the one main surface is exposed from the opening.

  According to the light source unit of the vehicle lighting device of the present invention, LED light emitting elements are mounted on both main surfaces of a metal or ceramic substrate, and one main surface of the substrate is in contact with a mounting plane formed on the bulb body. Touching. Thereby, the heat | fever which an LED light emitting element emits can be efficiently transmitted through a board | substrate and a valve | bulb main body with high heat conductivity, and can be thermally radiated. As a result, it is possible to provide an LED light source unit that improves the heat dissipation of the LED light-emitting element, has high luminous efficiency, high brightness, and long life.

  Moreover, since the outstanding heat dissipation characteristic is exhibited, the distance of the LED light emitting element arrange | positioned at the both main surfaces of a board | substrate can be shortened. That is, since the heat sink or the like is not sandwiched between the LED light emitting elements arranged on both sides, the light sources on both main surfaces can be arranged close to each other. Thereby, the light emission part close | similar to the filament of the conventional light bulb type light source can be formed.

  Also, a recess is formed in the valve body, the mounting plane is formed in the recess, and an opening penetrating to the opposite side of the valve body is formed in the mounting plane, and mounted on one main surface of the substrate. The LED light emitting element to be exposed is exposed from the opening. Thereby, while being able to irradiate the light emitted from a LED light emitting element on both sides of a valve main body, the position of a light emission part can be set up suitably. Thereby, the position of the LED light emitting element can be brought close to the filament position of the conventional light bulb type light source.

  Thus, according to the light source unit of the present invention, light distribution characteristics close to those of a conventional light bulb type light source can be exhibited, so that it is not necessary to change the design of the reflector or the like exclusively for the LED. Therefore, the light source unit of the present invention can be used as it is attached to a conventional vehicle lighting device, and can be used as a light source unit for replacing a bulb-type light source.

  Further, the heat dissipation characteristics can be further improved by configuring the valve body from a metal material or a ceramic material.

  Further, by forming a second recess in the valve body opposite to the mounting plane and penetrating the opening through the second recess, the light irradiation angle to the opposite side is widened, and further excellent The light distribution characteristic can be exhibited.

It is a schematic block diagram of the illuminating device for vehicles provided with the light source unit which concerns on embodiment of this invention. 1A is a perspective view illustrating a schematic structure of a light source unit according to an embodiment of the present invention, and FIG. 2B is an exploded perspective view of a bulb main body and an attachment. It is (A) top view, (B) front sectional view, and (C) bottom view which show schematic structure of the valve body concerning an embodiment of the present invention. It is an expanded sectional view of the board | substrate part of the light source unit which concerns on embodiment of this invention. It is sectional drawing which shows the example of the light source unit of the illuminating device for vehicles of a prior art. It is a schematic longitudinal cross-sectional view which shows the example of another prior art.

  Hereinafter, a light source unit of a vehicle lighting device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a vehicle lighting device 30 including a light source unit 1 according to an embodiment of the present invention. The vehicle illumination device 30 is used as, for example, a headlight of an automobile, and has the same configuration as that using a conventional halogen bulb or incandescent bulb as a light source. The light source unit 1 is a replaceable light source unit used in the vehicular illumination device 30 and is a component corresponding to a bulb of a conventional light bulb type light source.

  As shown in FIG. 1, the vehicular lighting device 30 includes a container-shaped lamp body 31 that is open at the front and rear, and a translucent front lens 33 that is attached so as to cover the front opening of the lamp body 31. And a reflector 32 disposed inside the lamp body 31.

  The reflector 32 has a reflecting surface 32a having a concave shape (for example, a parabolic surface) that opens forward, and a valve insertion hole 36 penetrating to the rear side is formed near the center of the reflecting surface 32. The bulb insertion hole 36 has a predetermined locking structure for holding the light source unit 1 serving as a light source. The lamp body 31 may be provided with a structure corresponding to the reflection surface 32a and the bulb insertion hole 36, and the lamp body 31 and the reflector 32 may be integrated as one component.

  The light source unit 1 includes an LED light emitting element 15 and serves as a light source for the vehicular illumination device 30. The light source unit 1 includes a bulb body 2 and an attachment 20 (a base). The insertion portion 2a of the bulb body 2 is inserted from the rear opening portion 31a of the lamp body 31 and the bulb insertion hole 36 into the interior of the lamp chamber 34 formed between the reflector 32 and the front lens 33 (insertion direction). Z).

  The attachment 20 fixes and holds the light source unit 1 to the vehicle lighting device 30 and is attached to the bulb insertion hole 36. The attachment 20 has a predetermined standardized shape (for example, H4, D4, etc.) corresponding to the locking structure of the insertion hole 36 described above. A structure in which the attachment 20 is fixed to the rear opening 31 a of the lamp body 31 may be employed. A cover or the like (not shown) for waterproofing or dustproofing may be attached to the rear opening 31a of the lamp body 31.

  A power supply wiring 17 and a connector 26 are connected to the LED light emitting element 15 of the light source unit 1. The wiring 17 is connected to the control board 25 through the connector 26 and the wiring 23 in sequence, and the control board 25 is connected to the wiring 38 on the vehicle side through the wiring 24 and the connector 27 in order. Thereby, the electric power which makes the LED light emitting element 15 light-emit is supplied.

  When electric power is supplied to the LED light emitting element 15 inserted and arranged in the lamp chamber 34, the LED light emitting element 15 emits light. The light emitted from the LED light emitting element 15 is reflected by the reflecting surface 32 a of the reflector 32 and is emitted forward of the vehicle lighting device 30.

  Here, the light emission direction L from the vehicular illumination device 30 is determined by the position of the LED light-emitting element 15 serving as a light source and the shape of the reflection surface 32 a of the reflector 32. In this embodiment, the position of the light source is made equal to the filament position of a conventional light bulb type light source. Therefore, the shape of the vehicle illumination device 30 may be the same as that of a conventional illumination device using a light bulb-type light source.

  2A is a perspective view showing a schematic structure of the light source unit 1, and FIG. 2B is an exploded perspective view showing a state in which the bulb body 2 and the attachment 20 are disassembled.

  As shown in FIG. 2A, the light source unit 1 has a substantially cylindrical shape as a whole, and includes a bulb body 2 and an attachment 20. The insertion portion 2a of the bulb main body 2 is inserted into the lamp chamber 34 (see FIG. 1) of the vehicle lighting device 30 (see FIG. 1) (insertion direction Z), and the attachment 20 has a bulb insertion hole 36 (see FIG. 1). ).

  The attachment 20 is formed with a locking claw 21 for fixing the light source unit 1 to the insertion hole 36. The locking structure of the attachment 20 including the locking claw 21 has a standardized predetermined shape as described above. Thereby, the light source unit 1 can be attached to the vehicle illumination device 30 in place of the conventional light bulb type light source.

  As shown in FIG. 2B, the attachment 20 is attached to the holding portion 2 b of the valve body 2. Specifically, the holding portion 2b is fitted into the holding hole 20a of the attachment 20, and is fixed using, for example, a screw or an adhesive. In addition, you may provide the sealing structure (for example, O-ring etc.) for waterproofing and dustproofing in the fitting part of the holding | maintenance part 2b and the attachment 20. FIG.

  In addition, a positioning structure (for example, a pin, a screw, a key groove, or the like) that determines the relative positional relationship between the valve body 2 and the attachment 20 may be formed in the fitting portion between the valve body 2 and the attachment 20. Thereby, a light source (LED light emitting element 15) can be arrange | positioned in the exact position with respect to the illuminating device 30 for vehicles, and the outstanding light distribution characteristic can be exhibited.

  Moreover, the above-mentioned positioning structure can also be comprised so that a position to fix can be adjusted freely. By making the relative position of the bulb main body 2 and the attachment 20 adjustable, the position of the light source with respect to the vehicle illumination device 30 can be suitably set according to the vehicle type. As a result, while realizing excellent light distribution suitable for each vehicle type, it is possible to share components used for the light source unit 1 and reduce manufacturing costs.

  The valve body 2 is a part having a substantially cylindrical shape as a whole in which the insertion portion 2a and the holding portion 2b are formed. There is an advantage that parts processing becomes easy by making it a substantially cylindrical shape. Moreover, since the insertion part 2a can be easily inserted into the bulb insertion hole 36 of the vehicular illumination device 30, the light source unit 1 can be easily attached. The basic shapes of the insertion portion 2a and the holding portion 2b are not limited to this, and different shapes (for example, a prismatic shape, a spherical shape, etc.) can be adopted.

  Here, the valve body 2 is composed of a material having good heat conductivity, for example, a metal material such as aluminum, ceramics, or the like. Thereby, the heat which generate | occur | produces in the LED light emitting element 15 can be transmitted efficiently.

  In the insertion portion 2 a of the valve body 2, a recess 3 is formed on the outer peripheral surface (side surface) that is lateral to the insertion direction Z of the valve body 2. Further, a recess 6 is formed on the side opposite to the recess 3 (downward in the drawing).

  A recess 4 is further formed inside the recess 3 as a substrate attachment region. And inside the recessed part 4, the board | substrate 10 with which LED light emitting element 15 as a light source was mounted in both main surface 10a, 10b (refer FIG.3 (B)) is arrange | positioned.

  FIG. 3A is a top view (seen from the direction of the recess 3) showing a schematic structure of the valve body 2, and FIG. 3B is a front sectional view (AA in FIG. 3A). (Cross sectional view) and (C) are bottom views (viewed from the direction of the recess 6).

  As shown in FIGS. 3A and 3B, an attachment plane 5 having a flat surface is formed at the bottom of the recess 4 serving as a substrate attachment region. One main surface 10 b of the substrate 10 abuts on the mounting plane 5, and the substrate 10 is fixed to the mounting plane 5 with screws 22. Of course, other fixing members (for example, metal fittings, resin support materials, adhesives, etc.) may be used instead of the screws 22.

  As described above, by providing the mounting plane 5 and bringing one main surface 10b of the substrate 10 into contact with each other, a wide contact area between the substrate 10 and the valve body 2 can be secured, so that the efficiency from the substrate 10 to the valve body 2 is improved. Can transfer heat well. In addition, you may apply | coat the compound for promoting heat transfer, etc. to the junction part of the attachment plane 5 and the main surface 10b.

  Moreover, the orientation of the main surfaces 10a and 10b of the substrate 10 can be accurately fixed by forming the attachment plane 5 and attaching the substrate 10 in this way. Therefore, since the position and orientation of the LED light emitting element 15 serving as the light source can be managed with high accuracy, the quality of each product can be stabilized and excellent light distribution characteristics can be exhibited.

  Here, as shown in FIG. 3B, the mounting plane 5 is formed substantially parallel to the insertion direction Z. Thereby, like the conventional light bulb type light source, it is possible to irradiate light evenly in the side of the insertion direction Z (up and down direction on the paper surface). The mounting plane 5 is formed with a predetermined dimension in the radial direction away from the central axis Z of the valve body 2 (same as the chain line indicating the insertion direction Z in the drawing). Thereby, for example, the virtual center plane of the substrate 10 can be arranged on the central axis Z, and the LED light emitting element 15 can be arranged at a suitable position for light distribution.

  In addition, the valve body 2 is formed with a wiring hole 8 that communicates from the concave portion 4 serving as a substrate attachment region to the end portion on the holding portion 2b side. The wiring hole 8 allows the wiring 17 connected to the substrate 10 to pass through. Thus, the light source unit 1 (see FIG. 1 and the like) is attached to the vehicle lighting device 30 (see FIG. 1 and the like) by providing the wiring hole 8 in the bulb body 2 and arranging the wiring 17 in the wiring hole 8. Work can be done easily.

  Further, by providing the wiring hole 8 so as to penetrate the inside of the valve body 2, the wiring 17 can be connected without impairing the sealing performance and the bonding strength of the joint portion between the valve body 2 and the attachment 20 (see FIG. 2). can do. Moreover, when assembling the attachment 20, it is possible to prevent problems such as the wiring 17 being pinched and damaged. In place of the wiring hole 8 penetrating the inside of the valve body 2, a groove or the like for arranging the wiring 17 may be formed on the outer peripheral surface of the valve body 2.

  As shown in FIGS. 3B and 3C, the mounting plane 5 in the recess 4 is formed with an opening 7 that penetrates to the recess 6 on the opposite side. Then, as shown in FIG. 3C, the LED light emitting element 15 mounted on the main surface 10 b of the substrate 10 is exposed from the opening 7. Thereby, the light emitted from the LED light emitting element 15 on the main surface 10 b side can be emitted to the outside of the bulb body 2 through the opening 7. That is, as shown in FIG. 3B, the light emitted from each LED light emitting element 15 mounted on both main surfaces 10a and 10b of the substrate 10 is irradiated on both sides (up and down direction on the paper surface) of the bulb body 2. Can do.

  Moreover, since the recessed part 3 (recessed part 4) and the recessed part 6 are formed in the both sides | surfaces of the valve | bulb main body 2, the irradiation angle of the light to both sides can be ensured suitably, and more excellent light distribution characteristics are demonstrated. can do. Further, the end portion 9 on the insertion direction Z side of the valve body 2 functions as a shade portion that prevents light from being directly emitted in the insertion direction Z.

  FIG. 4 is a partial enlarged cross-sectional view of the substrate 10 portion. As shown in FIG. 4, the substrate 10 has an insulating layer 12 formed on both main surfaces 10 a and 10 b of a base 11 made of metal or ceramics, and a conductive wiring pattern 13 formed on the insulating layer 12. Configured. Further, a protective film 14 (solder resist film or the like) is further formed thereon as necessary.

  Thus, by using a metal material or a ceramic material as the base material 11 of the substrate 10, the heat generated from the LED light emitting element 15 can be efficiently transmitted. In the light source unit 1 (see FIG. 1 and the like), as described above, the bulb body 2 (see FIG. 3) is made of metal or ceramics, and the main surface 10b of the substrate 10 is placed on the flat mounting plane 5 (see FIG. 3). Are in contact. By combining these effects, excellent heat dissipation performance can be exhibited. Thereby, the light emission efficiency of the light source unit 1 can be improved, and high luminance and long life can be achieved.

  Moreover, since sufficient heat dissipation performance can be exhibited even if the thickness of the substrate 10 is reduced, it is possible to reduce the distance between the LED light-emitting elements 15 mounted on the main surfaces 10a and 10b by reducing the thickness of the substrate 10. Thereby, it can be brought close to a point-like or linear light source such as a filament of a conventional light bulb-type light source. As a result, excellent light distribution characteristics can be exhibited even if the light source is used as it is in the conventional vehicle lighting device 30 (see FIG. 1) as a replacement for the conventional light bulb type light source.

  The connection terminal portions 15 a of the LED light emitting elements 15 mounted on the two main surfaces 10 a and 10 b of the substrate 10 are electrically connected to the element terminal portions 13 a of the wiring pattern 13. Further, the wiring 17 is electrically connected to the wiring terminal portion 13b of the wiring pattern 13 arranged on the one main surface 10a side.

  A through hole 16 is formed in the base material 11 of the substrate 10 so as to penetrate between both the main surfaces 10a and 10b. An insulating layer 12c is formed on the inner surface of the through hole 16 in the same manner as the two main surfaces 10a and 10b described above, and a wiring pattern 13c is formed inside the insulating layer 12c. That is, the wiring patterns 13 on both main surfaces 10a and 10b are electrically connected through the through holes 16 (wiring patterns 13c).

  In this way, by providing the through holes 16 that electrically connect the wiring patterns 13 on both the main surfaces 10a and 10b, the wiring 17 can be connected only to the wiring pattern formed on one main surface 10a (or 10b). It will be good. As a result, the number of wirings 17 and connection locations can be reduced, so that the manufacturing cost can be reduced by reducing the number of parts and the manufacturing process, and the periphery of the substrate 10 can be made compact and the product can be downsized. be able to.

  A reflective member or a lens member (not shown) may be provided on the substrate 10 or the LED light emitting element 15. Thereby, it becomes possible to exhibit further excellent light distribution characteristics.

  Further, the arrangement of the LED light emitting elements 15 mounted on both the main surfaces 10 a and 10 b is not necessarily symmetrical with respect to the virtual center plane of the substrate 10. Moreover, it is not necessary to be the same element. A suitable arrangement and element type can be selected according to the application of the vehicular illumination device 30. For example, the LED light-emitting element 15 mounted on one main surface 10a is used for the low beam of the headlamp, and the LED light-emitting element 15 mounted on the other main surface 10b is used for the high beam. Also good.

  Further, the light source unit 1 of the present invention is not limited to the headlamp, but is used for other lighting devices such as a fog lamp, a side lamp, a direction indicator lamp, a tail lamp, etc. It can be used as a part to replace

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. In addition, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Light source unit 2 Valve | bulb main body 3 Recessed part 4 Recessed part 5 Mounting plane 6 Recessed part 7 Opening part 10 Board | substrate 10a, 10b Main surface of a board | substrate 15 LED light emitting element 30 Vehicle lighting device 34 Lamp chamber 36 Valve insertion hole

Claims (3)

A bulb body inserted into the lamp chamber from the bulb insertion hole of the vehicle lighting device;
A metal or ceramic substrate attached to the valve body;
LED light emitting elements mounted on both main surfaces of the substrate,
Forming a recess in the valve body,
An attachment plane for contacting one main surface of the substrate is formed in the recess,
Forming an opening penetrating to the opposite side of the valve body in the mounting plane;
A light source unit for a vehicle lighting device, wherein the LED light emitting element mounted on the one main surface is exposed from the opening.   The light source unit of the vehicle lighting device according to claim 1, wherein the bulb body is made of a metal material or a ceramic material. Forming a second recess in the valve body opposite the mounting plane;
The light source unit of the vehicle lighting device according to claim 1, wherein the opening penetrates through the second recess.

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