JP2017084493A - Vehicle lighting appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lighting appliance which can be simplified in structure and reduced in cost by reducing the number of part items and assembling man-hours.SOLUTION: In a vehicle lighting appliance 1 in which an LED 5 being a light source and a baseboard 7 mounted with the LED 5 are accommodated in a lamp chamber 4 which is defined by the housing 2 and an outer lens 3 for covering an opening part of the housing, the baseboard 7 is constituted of a metal baseboard, and a part of the metal baseboard 7 is exposed to the outside of the housing 2 as an exposure part 7A. For example, the metal baseboard 7 is constituted of an aluminum baseboard in which a resist, copper foil and an insulation layer are laminated on its surface, and in the exposure part 7A which is exposed to the outside of the housing 2 of the aluminum baseboard 7, the resist, the copper oil and the insulation layer are peeled off from one another.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicular lamp that uses an LED (light emitting diode) as a light source.

  Increasingly, vehicle lamps such as fog lamps use LEDs as light sources that have advantages such as high luminous efficiency, long life, and low power consumption. Such a vehicular lamp includes a reflector type that reflects light emitted from an LED toward a desired direction (front or rear of the vehicle) by a reflector (see, for example, Patent Document 1).

  By the way, LED emits high heat by light emission, and when the temperature becomes high, the light emission efficiency and the lifetime are reduced. For this reason, some vehicular lamps that use LEDs as light sources employ a configuration in which a heat sink is provided as a heat radiating member, and heat from the LEDs is radiated by the heat sink to suppress the temperature rise of the LEDs (see Patent Document 2). ).

JP 2014-086328 A Japanese Unexamined Patent Publication No. 2014-211989

  However, when a heat radiating member such as a heat sink is provided in order to suppress the temperature rise of the LED, the number of parts and the number of assembling steps increase, resulting in a problem that the structure is complicated and the cost is increased.

  The present invention has been made in view of the above problems, and an object thereof is to provide a vehicular lamp that can reduce the number of parts and the number of assembling steps, thereby simplifying the structure and reducing the cost. is there.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided a vehicle in which a light emitting element and a substrate on which the light emitting element is mounted are accommodated in a lamp chamber defined by a housing and an outer lens covering the opening. In the lamp, the housing has a substrate insertion hole at a rear portion, the substrate is a metal substrate, and has an exposed portion extending rearward at the rear portion of the substrate, the exposed portion being The substrate insertion hole is exposed to the outside of the housing.

  According to a second aspect of the present invention, in the first aspect of the present invention, the substrate is configured by an aluminum substrate having a resist, a copper foil, and an insulating layer laminated on the surface, and the resist and the copper are formed in the exposed portion. The foil and the insulating layer are in a peeled state.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a positioning rib projects from the inner surface of the housing, and the substrate is positioned by applying the substrate to the positioning rib. And

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the exposed portion and the substrate insertion hole are each two or more, and the housing has one of the substrate insertions. The positioning rib is provided between the hole and the other substrate insertion hole.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the substrate insertion hole is sealed with an adhesive in a state in which the exposed portion is inserted. It is characterized by airtightness inside and outside the light room.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein a heat radiating hole is formed in the exposed portion.

  According to the first aspect of the present invention, the heat generated by the LED is conducted to the metal substrate having a high thermal conductivity. However, since a part of the metal substrate is exposed outside the housing, the heat is generated from the exposed portion. Heat dissipation is promoted, and the temperature rise of the LED is suppressed. As a result, the vehicle lamp does not require a heat radiating member such as a heat sink, and the number of parts and assembly man-hours are reduced, thereby simplifying the structure and reducing the cost.

  According to invention of Claim 2, the board | substrate is comprised with an aluminum board | substrate with high heat conductivity, and the resist, copper foil, and insulating layer of the exposed part exposed outside the housing of this aluminum board | substrate are peeled off. For this reason, it is possible to prevent water droplets adhering to the exposed portion exposed outside the lamp chamber that is not sealed from entering the gap between the resist and the copper foil and entering the lamp chamber. It is also possible to prevent the resist from being deteriorated due to the influence of water droplets.

  According to the third and fourth aspects of the present invention, since the positioning of the metal substrate with respect to the housing is performed within the housing, the positioning structure is not exposed to the outside of the housing, and the compact configuration and appearance of the vehicle lamp Quality improvement can be realized.

  According to the fifth aspect of the present invention, since the periphery of the portion of the housing through which the metal substrate passes is sealed with the adhesive, water can be reliably prevented from entering the housing from the outside.

  According to the sixth aspect of the present invention, since the heat radiating hole is formed in the exposed portion exposed to the outside of the housing of the metal substrate, the heat radiating area of the exposed portion of the metal substrate (the area in contact with the outside air) is increased and the exposed portion is exposed. The heat dissipation of the part is improved.

1 is a side view of a vehicular lamp according to the present invention. It is side sectional drawing of the vehicle lamp which concerns on this invention. It is the sectional view on the AA line of FIG. It is a figure similar to FIG. 3 which shows another form of this invention.

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

  FIG. 1 is a side view of a vehicular lamp according to the present invention, FIG. 2 is a side cross-sectional view of the vehicular lamp, and FIG. 3 is a cross-sectional view taken along line AA of FIG.

  A vehicular lamp 1 according to the present embodiment is a fog lamp disposed on the left and right of a front portion of a vehicle, and is defined by an outer lens 3 that covers a housing 2 and its opening as shown in FIGS. 1 and 2. The lamp chamber 4 (see FIG. 2) contains an LED 5 as a light source and an aluminum substrate 7 on which the LED 5 and a large number of electronic components 6 are mounted. In the present embodiment, as described later, a part of the housing 2 also serves as a reflector.

  The housing 2 is integrally formed of an opaque resin that does not transmit light, and the peripheral edge of the outer lens 3 that is formed in a circular arc shape by a transparent resin that transmits light at the peripheral edge of a circular opening that opens to the front surface thereof. As described above, the lamp chamber 4 is defined by the housing 2 and the outer lens 3. In addition, two board insertion holes 2 </ b> B are provided in the rear part of the housing 2.

  As shown in FIG. 2, the aluminum substrate 7 is mounted horizontally so as to be in close contact with the inner surface of the horizontal upper wall of the housing 2 (the surface facing the lamp chamber 4). As shown in FIG. 3, the left and right two LEDs 5 and a large number of the electronic components 6 are mounted. Here, the two LEDs 5 are mounted in a row at an appropriate interval in the left-right direction (vertical direction in FIG. 3) so that the light emission direction is downward.

  By the way, as shown in FIG. 3, the aluminum substrate 7 has a rear end portion that narrows stepwise toward the center in the width direction following the shape of the rear portion of the housing 2, and branches to the left and right of the rear end portion. The bifurcated portion constitutes an exposed portion 7A (a hatched portion in FIG. 3) that passes through the board insertion hole 2B formed in the rear portion of the housing 2 and is exposed to the outside. Here, on the inner surface of the rear end wall that forms the step shape of the portion of the housing 2 in which the aluminum substrate 7 is accommodated, two right and left protruding positioning ribs 2a are integrally projected forward. On the inner surface in the center in the width direction of the portion through which the exposed portion 7A of the aluminum substrate 7 of the housing 2 passes, a single projecting positioning rib 2b is integrally projected toward the front. The aluminum substrate 7 is laterally moved with respect to the housing 2 by engaging the positioning rib 2b projecting from the inner surface of the housing 2 with a positioning groove 7a formed at the center in the width direction of the rear end portion. Is positioned. Also, the aluminum substrate 7 has a stepped rear end surface that is abutted against the positioning ribs 2 a that are provided on the left and right sides of the rear end inner surface of the housing 2, respectively. Positioned in the direction.

  Here, although not shown, a resist, a copper foil, and an insulating layer are laminated on the surface of the aluminum substrate 7, but in the left and right exposed portions 7A projecting out of the housing 2, the resist, the copper foil, The insulating layer is peeled off. Therefore, in the aluminum substrate 7, in the exposed portion 7A, the aluminum ingot as a base material is directly exposed to the outside. In the present embodiment, the substrate insertion hole 2B of the housing 2 is sealed with an adhesive (not shown) after the exposed portion 7A of the aluminum substrate 7 has penetrated. By sealing with the adhesive, the interior of the lamp chamber 4 that has become airtight due to the formation of the substrate insertion hole 2B can be made airtight again.

  As shown in FIG. 2, the lower part of the aluminum substrate 7 of the housing 2 constitutes a reflector portion 2A, and the concave curved inner surface of the reflector portion 2A constitutes a reflecting surface 2c. The reflection surface 2c is subjected to a reflection process such as aluminum vapor deposition for increasing the light reflectivity.

  In the vehicular lamp 1 configured as described above, when current is supplied to each LED 5 from a power source (not shown) such as a battery, light is emitted downward from these LEDs 5 as shown in FIG. To do. Then, the light is reflected by the reflecting surface 2c of the reflector portion 2A of the housing 2 and travels forward of the vehicle, and the reflected light passes through the transparent outer lens 3 and is irradiated forward of the vehicle.

  In the above, in the vehicular lamp 1 according to the present embodiment, the heat generated by each LED 5 is conducted to the aluminum substrate 7 having a high thermal conductivity. However, a part of the aluminum substrate 7 serves as an exposed portion 7A. 2 is exposed to the outside, heat dissipation from the exposed portion 7A is promoted, and the temperature rise of the LED 5 is suppressed. As a result, the vehicular lamp 1 according to the present embodiment does not require a heat radiating member such as a heat sink, and the number of parts and assembly man-hours are reduced, thereby simplifying the structure and reducing the cost. In this embodiment, the resist, the copper foil, and the insulating layer of the exposed portion 7A exposed to the outside of the housing 2 of the aluminum substrate 7 are peeled off. For this reason, water droplets adhering to the exposed portion 7A exposed to the outside of the housing 2 that is not in a sealed state enter the gap between the resist and the copper foil and prevent entry into the lamp chamber 4. Can do. It is also possible to prevent the resist from being deteriorated due to the influence of water droplets.

  In the present embodiment, since the positioning ribs 2a and 2b project from the inner surface of the housing 2, the aluminum substrate 7 is positioned in the left and right and front and rear directions with respect to the housing 2. For this reason, the positioning structure is not exposed to the outside of the housing 2, and the compact configuration of the vehicular lamp 1 and the appearance quality can be improved.

  Furthermore, in this embodiment, since the board insertion hole 2B of the housing 2 is sealed with an adhesive, the effect of reliably preventing water from entering the housing 2 from the outside can be obtained.

  Here, another embodiment of the present invention is shown in FIG.

  That is, FIG. 4 is a view similar to FIG. 3 showing another embodiment of the present invention. In the illustrated embodiment, two circular holes 7b are formed in the left and right exposed portions 7A of the aluminum substrate 7, respectively. Other configurations are the same as those of the above-described embodiment. Therefore, in FIG. 4, the same elements as those shown in FIG. 3 are denoted by the same reference numerals, and repetitive description thereof will be omitted below.

  Thus, if the circular holes 7b are formed in the left and right exposed portions 7A exposed to the outside of the housing 2 of the aluminum substrate 7 as described above, the heat radiation area of the exposed portion 7A of the aluminum substrate 7 (external air is touched). (Area) increases, the effect of further improving the heat dissipation of the exposed portion 7A is obtained.

  In the above, the embodiment in which the present invention is applied to a vehicular lamp used as a fog lamp has been described. However, the present invention also applies to a reflector-type vehicular lamp that is used for any other purpose. Of course, it is applicable to.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Housing 2A Reflector part of housing 2B Substrate insertion hole 2a, 2b Positioning rib 3 Outer lens 4 Lamp chamber 5 LED
6 Electronic parts 7 Aluminum substrate (metal substrate)
7A Exposed portion of aluminum substrate 7A Exposed portion of aluminum substrate 7a Positioning groove of aluminum substrate 7b Circular hole (hole) of aluminum substrate

Claims (6)

In a vehicle lamp comprising a light-emitting element and a substrate on which the light-emitting element is mounted in a lamp chamber defined by an outer lens that covers a housing and its opening,
The housing has a substrate insertion hole at the rear,
The substrate is a metal substrate and has an exposed portion extending rearward at the rear portion of the substrate,
The vehicle lamp according to claim 1, wherein the exposed portion serves as the board insertion hole and is exposed to the outside of the housing.   The substrate is formed of an aluminum substrate having a resist, copper foil, and insulating layer laminated on a surface thereof, and the resist, the copper foil, and the insulating layer are peeled off at the exposed portion. The vehicular lamp according to 1.   3. The vehicular lamp according to claim 1, wherein a positioning rib projects from an inner surface of the housing, and the substrate is positioned by applying the substrate to the positioning rib. Each having two or more of the exposed portion and the substrate insertion hole;
The vehicular lamp according to any one of claims 1 to 3, wherein the housing has the positioning rib between one of the board insertion holes and the other of the board insertion holes. .   5. The substrate insertion hole according to claim 1, wherein the substrate insertion hole is sealed with an adhesive in a state where the exposed portion is inserted, and airtightness is maintained between the lamp chamber and the lamp chamber. The vehicle lamp according to any one of the above. The vehicular lamp according to claim 1, wherein a heat radiating hole is formed in the exposed portion.

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