CN211232730U - Vehicle lamp - Google Patents
Vehicle lamp Download PDFInfo
- Publication number
- CN211232730U CN211232730U CN201921769448.4U CN201921769448U CN211232730U CN 211232730 U CN211232730 U CN 211232730U CN 201921769448 U CN201921769448 U CN 201921769448U CN 211232730 U CN211232730 U CN 211232730U
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- Prior art keywords
- circuit board
- flexible printed
- led
- board
- support portion
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Abstract
In a vehicle lamp using a flexible printed circuit board, a failure of the flexible printed circuit board is prevented in advance. The utility model relates to a lamp for vehicle, this lamp for vehicle possesses: the LED circuit board (17) is provided with an LED, a flexible printed board (21) which is jointed with an LED mounting surface (17a) of the LED circuit board (17), and a heat sink (19) which is arranged on the upper surface (17b) side of the LED circuit board (17) opposite to the LED mounting surface (17 a). The heat sink (19) is provided with a support part (44), and the support part (44) supports the flexible printed substrate (21) in a manner that the flexible printed substrate (21) is separated from the edge part (17c) of the LED circuit substrate (17).
Description
Technical Field
The present invention relates to a vehicle lamp, and more particularly to a vehicle lamp using a flexible printed circuit board.
Background
Conventionally, the following vehicle lamp is known: the LED light source device includes an LED substrate on which an LED is mounted as a light source, a heat sink disposed on a surface of the substrate opposite to a light source mounting surface, and a reflector disposed on the light source mounting surface of the substrate (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016-225240
SUMMERY OF THE UTILITY MODEL
Problem to be solved by the utility model
However, in the vehicle lamp as described above, a flexible printed circuit board may be used to interconnect the LED boards. By using the flexible printed substrate, simplification and weight reduction of the structure can be achieved.
However, in the vehicle lamp using the flexible printed circuit board, if the flexible printed circuit board repeatedly comes into contact with the edge portion of the LED board due to vibration during traveling or the like, a failure such as disconnection may occur in the flexible printed circuit board.
The present invention has been made in view of such circumstances, and an object of the present invention is to prevent a failure of a flexible printed circuit board in a vehicle lamp using the flexible printed circuit board.
Means for solving the problems
In order to solve the above problem, an aspect of the present invention provides a vehicle lamp including: the light-emitting device includes a circuit board on which a light-emitting element is mounted, a flexible printed board joined to a light-emitting element mounting surface of the circuit board, and a heat sink disposed on a surface side of the circuit board opposite to the light-emitting element mounting surface. The heat sink includes a support portion that supports the flexible printed circuit board so as to separate the flexible printed circuit board from an edge portion of the circuit board.
The support portion may be formed of a recess formed in the heat sink.
Another aspect of the present invention is also a vehicle lamp. The vehicle lamp includes: a base; a circuit board disposed on the base; and a flexible printed board joined to a surface of the circuit board opposite to the surface on the base portion side. The base portion includes a support portion that supports the flexible printed circuit board so as to separate the flexible printed circuit board from an edge portion of the circuit board.
The support portion may be formed of a projection projecting from the base portion.
The gap between the edge portion of the circuit board and the flexible printed board may be 0.6mm to 0.8 mm.
The corner of the support portion may have a radius of curvature of 0.5mm or more.
Effect of the utility model
According to the present invention, in the vehicle lamp using the flexible printed circuit board, a failure of the flexible printed circuit board can be prevented in advance.
Drawings
Fig. 1 is a schematic front view of a vehicle lamp according to an embodiment of the present invention.
Fig. 2 is a schematic exploded perspective view of the lamp unit.
Fig. 3 is a schematic sectional view a-a of the lamp unit shown in fig. 1.
Fig. 4 is a schematic enlarged view of a portion C of the lamp unit shown in fig. 3.
Fig. 5 is a schematic sectional view B-B of the lamp unit shown in fig. 1.
Description of the reference numerals
10: a vehicular lamp;
14: a lamp unit;
15: a reflector;
16: a reflector unit;
17: an LED circuit substrate;
18：LED；
19: a heat sink;
20: a connector circuit substrate;
21: a flexible printed substrate;
23: a connector;
24: a base;
42: welding flux;
44. 52: a support portion.
Detailed Description
Hereinafter, a vehicle lamp according to an embodiment of the present invention will be described in detail with reference to the drawings. In the present specification, when terms indicating directions such as "up", "down", "front", "rear", "left", "right", "inner", "outer" and the like are used, they refer to directions in a posture in which the vehicle lamp is mounted on the vehicle.
Fig. 1 is a schematic front view of a vehicle lamp 10 according to an embodiment of the present invention. The vehicle lamp 10 is a headlamp disposed in a front portion of a vehicle.
As shown in fig. 1, the vehicle lamp 10 includes a lamp body 11 and a transparent cover 12 that covers a front surface opening of the lamp body 11. The lamp body 11 and the outer cover 12 form a lamp chamber 13.
A lamp unit 14 is accommodated in the lamp chamber 13. The lamp unit 14 is supported by a support member, not shown, so as to be tiltable with respect to the lamp body 11 for the purpose of aiming adjustment.
Fig. 2 is a schematic exploded perspective view of the lamp unit 14. As shown in fig. 1 and 2, the lamp unit 14 includes a reflector unit 16, six LED circuit boards 17, LEDs 18 mounted on the LED circuit boards 17, a heat sink 19, a connector circuit board 20, a connector 23 mounted on the connector circuit board 20, and a flexible printed board 21 for wiring the LED circuit boards 17 and the connector circuit board 20.
The reflector unit 16 has six parabolic reflectors 15 arranged in the vehicle width direction. The six reflectors 15 are integrally formed of a resin material. One LED circuit board 17 and one LED18 are disposed for each reflector 15, and a parabolic reflection optical system is configured.
Fig. 3 is a schematic sectional view a-a of the lamp unit 14 shown in fig. 1. The reflector unit 16 includes a flat plate-like base portion 24, a reflector 15 as a light control member for controlling light from the LED18, and a light blocking member 25.
A hole portion 26 for guiding light from the LED18 to the reflector 15 is formed on the base portion 24. The reflector 15 extends obliquely forward and downward from a rear portion of the hole 26 in the base portion 24. The reflector 15 is a parabolic reflector that reflects light from the LED18 toward the front of the fixture. The reflector 15 has a reflecting surface formed with reference to a paraboloid of revolution. The central axis of rotation of the paraboloid of revolution of the reflecting surface becomes the optical axis of the reflector 15. The reflector 15 is disposed such that the optical axis faces the vehicle front-rear direction (horizontal direction). The LED18 is disposed at the focal point of the reflecting surface of the reflector 15.
The light-shielding member 25 is provided in front of the hole 26 in the base 24. The light shield 25 prevents light from the LED18 from being emitted directly to the exterior of the light fixture.
The LED circuit substrate 17 is supported on the base 24 of the reflector unit 16. The LED circuit board 17 is a plate-like body made of metal such as aluminum. The LED circuit board 17 is formed by punching a metal plate. The lower surface of the LED circuit board 17 serves as an LED mounting surface 17 a. An insulating film is formed on the LED mounting surface 17a, the LED18 is mounted on the insulating film such that the light emitting surface faces downward, and a circuit pattern for supplying power to the LED18 is formed on the insulating film. As described above, the LED18 is disposed at the focal point of the reflecting surface of the reflector 15. The LED18 receives a current from the LED circuit board 17 and emits light. Fig. 3 shows an example of a light beam (light beam L) emitted from the LED18, reflected by the reflecting surface of the reflector 15, and emitted to the front of the lamp.
A cable (not shown) for supplying electric power from outside the lamp house is connected to the connector 23 (see fig. 1 and 2). A current for causing the LEDs 18 to emit light is supplied from the connector circuit board 20 to each LED circuit board 17 via the flexible printed board 21.
The heat sink 19 is a substantially plate-like body made of a metal having high thermal conductivity such as aluminum, for example. The heat sink 19 is disposed on the LED circuit board 17 on the side of the upper surface 17b opposite to the LED mounting surface 17 a. The upper surface 17b of the LED circuit board 17 abuts on the lower surface 19a of the heat sink 19, and heat generated from the LED18 is transferred to the heat sink 19 via the LED circuit board 17, and is dissipated into the air in the lamp chamber 13. In order to improve the thermal conductivity, thermal grease 40 may be applied between the upper surface 17b of the LED circuit board 17 and the lower surface 19a of the heat sink 19 (see fig. 4).
Fig. 4 is a schematic enlarged view of a portion C of the lamp unit 14 shown in fig. 3. As shown in fig. 4, the flexible printed board 21 is joined to the LED mounting surface 17a of the LED circuit board 17 via solder 42.
In the vehicle lamp 10 according to the present embodiment, the heat sink 19 includes the support portion 44, and the support portion 44 supports the flexible printed circuit board 21 so that the flexible printed circuit board 21 is separated from the edge portion 17c of the LED circuit board 17. As shown in fig. 4, a part of the flexible printed circuit board 21 is supported by the support portion 44, and the flexible printed circuit board 21 is bent downward from the vicinity of the solder 42, and a gap D is formed between the edge portion 17c of the LED circuit board 17 and the flexible printed circuit board 21.
In the present embodiment, the support portion 44 is formed by a recess formed in the heat sink 19. Since the recessed portion can be formed by press working, it is easy to form the recessed portion, and the R portion can be formed at the corner of the recessed portion. As shown in fig. 2, in the heat sink 19, a plurality of support portions 44 are formed at portions corresponding to the flexible printed boards 21 in order to support the flexible printed boards 21 between the adjacent LED circuit boards 17 and the flexible printed boards 21 between the LED circuit boards 17 and the connector circuit board 20. As shown in fig. 2, the shape of the support portion 44 can take various shapes depending on the shape of the flexible printed board 21 to be supported.
As described above, in the vehicle lamp using the flexible printed circuit board, if the flexible printed circuit board repeatedly comes into contact with the edge portion of the LED board due to vibration during traveling or the like, a failure such as disconnection may occur in the flexible printed circuit board. Therefore, in the vehicle lamp 10 according to the present embodiment, the flexible printed board 21 is separated from the edge portion 17c of the LED circuit board 17 by the support portion 44 provided to the heat sink 19. Accordingly, since the flexible printed board 21 is less likely to come into contact with the edge portion 17c of the LED circuit board 17 due to vibration during traveling, etc., it is possible to prevent a failure such as disconnection from occurring in the flexible printed board 21.
As described above, in the present embodiment, the LED circuit board 17 is formed by punching a metal plate. In general, burrs are likely to be generated in the edge portions of the substrate formed by the punching process, and the contact between the burrs and the flexible printed circuit board increases the possibility of damage to the flexible printed circuit board. However, in the vehicle lamp 10 according to the present embodiment, since the flexible printed circuit board 21 is separated from the edge portion 17c of the LED circuit board 17 by the support portion 44 provided on the heat sink 19, damage to the flexible printed circuit board 21 due to burrs can be prevented.
The gap D between the edge portion 17c of the LED circuit board 17 and the flexible printed board 21 is preferably 0.6mm to 0.8 mm. By setting the gap D to 0.6mm or more, the contact of the edge portion 17c with the flexible printed board 21 can be appropriately prevented. In addition, by setting the gap D to 0.8mm or less, the flexible printed board 21 can be prevented from being bent beyond a necessary range.
The corner 44a of the support portion 44 preferably has a radius of curvature of 0.5mm or more. In this case, the flexible printed circuit board 21 can be prevented from being damaged by the corner portion 44a of the support portion 44.
Fig. 5 is a schematic sectional view B-B of the lamp unit 14 shown in fig. 1. The structure around the connector circuit board 20 will be described with reference to fig. 5.
As shown in fig. 5, the connector circuit board 20 is disposed on a pedestal portion 50 formed on the base portion 24 of the reflector unit 16. A surface of the connector circuit board 20 opposite to the surface 20b on the base 24 side (i.e., an upper surface of the connector circuit board 20) serves as a connector mounting surface 20 a. An insulating film is formed on the connector mounting surface 20a, the connector 23 is mounted on the insulating film, and a circuit pattern for wiring to the connector 23 is formed on the insulating film. The connector circuit board 20 is also a plate-like body formed of a metal such as aluminum, and is formed by punching a metal plate, as in the LED circuit board 17.
A flexible printed board 21 is joined to the connector mounting surface 20a of the connector circuit board 20 via solder. As described above, the flexible printed board 21 wires the connector circuit board 20 and the LED circuit board 17.
In the vehicle lamp 10 according to the present embodiment, the base portion 24 includes the support portion 52, and the support portion 52 supports the flexible printed circuit board 21 so that the flexible printed circuit board 21 is separated from the edge portion 20c of the connector circuit board 20. A part of the flexible printed circuit board 21 is supported by the support portion 52, and the flexible printed circuit board 21 is bent upward from the vicinity of the solder, so that a gap is formed between the edge portion 20c of the connector circuit board 20 and the flexible printed circuit board 21.
In the present embodiment, the support portion 52 is constituted by a convex portion protruding from the base portion 24. Such a convex portion can be integrally formed when the base portion 24 is resin-molded, and therefore, is easily formed. In the case of integral molding with resin, it is preferable to design the mold so that the parting line of the mold does not lie on the support portion.
The gap between the edge portion 20c of the connector circuit board 20 and the flexible printed board 21 is preferably 0.6mm or more and 0.8mm or less. Corner 52a of support portion 52 preferably has a radius of curvature of 0.5mm or more.
The present invention has been described above based on the embodiments. It should be understood by those skilled in the art that these embodiments are examples, and various modifications are possible in combination of the components and the processing steps, and such modifications are also within the scope of the present invention.
For example, although the above-described embodiments have exemplified LEDs as the light emitting elements, the light source is not limited to LEDs as long as it is a semiconductor light emitting element, and, for example, a semiconductor laser may be used.
Claims (8)
1. A lamp for a vehicle, characterized in that,
the vehicle lamp includes:
a circuit board on which a light emitting element is mounted;
a flexible printed board bonded to the light-emitting element mounting surface of the circuit board; and
a heat sink disposed on a side of the circuit board opposite to the light-emitting element mounting surface,
the heat sink includes a support portion that supports the flexible printed circuit board so as to separate the flexible printed circuit board from an edge portion of the circuit board.
2. The vehicular lamp according to claim 1, wherein the support portion is constituted by a recessed portion formed in the heat sink.
3. The vehicular lamp according to claim 1 or 2, wherein a gap between the edge portion of the circuit board and the flexible printed board is 0.6mm or more and 0.8mm or less.
4. The vehicular lamp according to claim 1 or 2, wherein a corner portion of the support portion has a radius of curvature of 0.5mm or more.
5. A vehicle lamp, characterized by comprising:
a base;
a circuit board disposed on the base portion; and
a flexible printed board joined to a surface of the circuit board opposite to the surface on the base portion side,
the base portion includes a support portion that supports the flexible printed circuit board so as to separate the flexible printed circuit board from an edge portion of the circuit board.
6. The vehicular lamp according to claim 5, wherein the support portion is constituted by a convex portion protruding from the base portion.
7. The vehicle lamp according to claim 5, wherein a gap between the edge portion of the circuit board and the flexible printed board is 0.6mm or more and 0.8mm or less.
8. The vehicular lamp according to any one of claims 5 to 7, wherein a corner portion of the support portion has a radius of curvature of 0.5mm or more.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018198721 | 2018-10-22 | ||
| JP2018-198721 | 2018-10-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211232730U true CN211232730U (en) | 2020-08-11 |
Family
ID=71924546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921769448.4U Active CN211232730U (en) | 2018-10-22 | 2019-10-21 | Vehicle lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211232730U (en) |
-
2019
- 2019-10-21 CN CN201921769448.4U patent/CN211232730U/en active Active
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| GR01 | Patent grant |