JP2008077928A - Vehicular led lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a prescribed irradiation light amount by suppressing temperature rise of LEDs by increasing heat radiation property of self heat generation of the LEDs in a vehicular LED lighting fixture with the LEDs as a light source, and provide the vehicular LED lighting fixture having high reliability. <P>SOLUTION: In this vehicular LED lighting fixture, a light room 3 is formed by the front lens 1 and two members of a housing 2, and a metal support plate 11 to support lighting fixture units 13 arranged in the light room 3 is supported by aiming screws 20 fixed to the housing 2 and a metal pivot 8 supported by a metal support body 9 mounted on a heat sink 7 fixed to the housing 2. Heat generated by LED light sources 15 is sequentially dissipated from the heat sink 7 into the atmosphere through a metal mounting plate 14, the metal support plate 11, the metal pivot 8, and the metal support body 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle LED lamp using an LED as a light source.

  The LED has a characteristic that the light emission efficiency is lowered by the temperature rise of the LED itself. Possible causes of LED temperature rise include self-heating when the LED is turned on and exposure to a high temperature environment.

  On the other hand, LEDs generally have advantages such as small size, low power consumption, and long life compared to various lamps. Conventionally, LEDs have been used to make high-mount stop lamps, stop-and-tail lamps, turn signals, etc. In recent years, a vehicle headlamp using an LED as a light source has been proposed.

  In general, a vehicular lamp is formed in a hermetically sealed environment (lamp room) formed by a front lens and a housing. When an LED supported in the lamp chamber is turned on, the self-heating of the LED and the self lamp The temperature of the LED itself rises significantly due to a synergistic effect with the temperature rise in the lamp chamber due to heat generation. As a result, the light emission efficiency of the LED decreases, reducing the amount of light radiated from the lamp. There is also a possibility that the light distribution performance and the light distribution standard will not be satisfied.

  Further, when the temperature in the lamp chamber becomes higher than the rated operating temperature range of the LED, the LED cannot be turned on, and the function as a lamp may not be achieved.

  Accordingly, proposals have been made for vehicle headlamps that suppress the occurrence of the above problems. As shown in FIG. 4, a vehicle headlamp 50 includes a transparent cover 51, a lamp body 52, a vertical panel portion 53, a support bracket 56 in which a unit support portion 54 and a heat sink portion 55 are integrated, and a socket cover 57. The vertical panel portion 53 and the unit support portion 54 of the support bracket 56 are located in the lamp chamber 58 of the headlamp 50, and the heat sink portion 55 is outside the lamp chamber 58 of the headlamp 50. It is extended.

  A semiconductor light emitting element 59, a reflector 60, and a light control member 61 are fixed to the unit support portion 54 of the support bracket 56 located in the lamp chamber 58 of the headlamp 50, and the light control member 61 supports the projection lens 62. is doing.

In the vehicle headlamp 50 having the semiconductor light emitting element 59 as a light source having the above-described configuration, the self-heating when the semiconductor light emitting element 59 is turned on is a unit support portion of the support bracket 56 formed of a material that is a good conductor of heat. The heat is transferred from the heat sink portion 55 to the heat sink portion 55, and is dissipated outside the lamp chamber 58 by the heat sink portion 55. Thereby, the temperature rise of the semiconductor light emitting element 59 itself when the semiconductor light emitting element 59 is turned on is suppressed (see, for example, Patent Document 1).
JP-A-2005-141917

  In the conventional vehicle headlamp 50, the lamp body 52 and the heat sink portion 55 of the support bracket 56 are connected via a socket cover 57 formed of a flexible material. When 56 is tilted, the socket cover 57 is deformed by the displacement due to the tilt and absorbs the displacement, so that no displacement force is applied to the fixed lamp body 52.

  However, the function of the socket cover 57 is to absorb the displacement of the support bracket 56 that occurs during aiming adjustment, and hardly contributes to the heat radiation of the semiconductor light emitting element 59. Therefore, the socket cover 57 is an inefficient part for the vehicle headlamp 50.

  Further, the heat sink portion 55 has a higher heat dissipation efficiency and a better heat dissipation effect as the heat dissipation area of the entire surface of the heat sink portion 55 in contact with the outside air (air) is larger. That is, the size of the heat sink 55 is related to the heat dissipation efficiency, but in the case of the conventional vehicle headlamp 50, the support bracket in which the vertical panel 53, the unit support 54, and the heat sink 55 are integrated. 56, the reflector 60, the light control member 61, and the projection lens 62 are supported only by the aiming screw 63 fixed to the lamp body 52, and the weight load applied to the aiming screw 63 is increased by increasing the heat sink 55. Become. As a result, there is a possibility that a defect occurs in the aiming screw 63 to which the weight load has been applied due to an impact caused by vibration during traveling of the vehicle, thereby impairing reliability.

  Therefore, the present invention was devised in view of the above problems, and the object of the present invention is to increase the temperature of the LED by increasing the heat dissipation of the LED's self-heating in a vehicle LED lamp using the LED as a light source. Therefore, it is possible to provide a vehicle LED lamp with high reliability, which is capable of suppressing a decrease in light emission efficiency of the LED and ensuring a predetermined amount of irradiation light.

  In order to solve the above-mentioned problem, the invention described in claim 1 of the present invention is a lamp unit having at least one LED light source in which a lamp chamber is formed by at least a front lens and a housing, and a metal that supports the lamp unit. A support plate is located in the lamp chamber, and the metal support plate is supported by an aiming screw extending from the housing and a metal pivot connected to a heat sink fixed outside the lamp chamber of the housing. is there.

  According to a second aspect of the present invention, in the first aspect, the metal support plate is swingably supported by the metal pivot via a fitting support portion formed on the metal support plate. It is characterized by that.

  The LED lamp for a vehicle of the present invention forms a lamp chamber by a front lens and a housing, a lamp unit having at least one LED light source and a metal support plate that supports the lamp unit are positioned in the lamp chamber, and the metal support plate The lamp unit is swingably supported by an aiming screw extending from the housing and a metal pivot connected to a heat sink fixed outside the lamp chamber of the housing, so that the aiming of the lamp unit can be adjusted. The heat generated by the LED light source is sequentially dissipated from the heat sink to the atmosphere via the metal support plate and the metal pivot.

  As a result, a relatively heavy heat sink is not attached to the metal support plate, and the metal support plate is also supported by the metal pivot, reducing the impact caused by vibrations when the vehicle is running and reducing reliability. The lamp has been improved.

  Furthermore, the metal pivot contributes to both the aiming operation and the heat dissipation effect, and by using the metal pivot, the structure of the lamp is mechanically and thermally reliable.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIG. 1 to FIG. 3 (the same parts are given the same reference numerals). The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. Unless stated to the effect, the present invention is not limited to these embodiments.

  FIG. 1 is a cross-sectional view showing an embodiment according to a vehicle LED lamp of the present invention. In the present embodiment, the lamp chamber 3 is mainly formed by two members of the front lens 1 and the housing 2. In the front lens 1 and the housing 2, a seal leg portion 5 provided at the peripheral end of the front lens 1 is inserted into a seal groove portion 4 provided at one front opening end of the housing 2, and the seal groove portion 4 and the seal leg portion are inserted. The elastic sealing material 6 is filled in the gap with 5.

  In this embodiment, the seal groove portion is provided on the housing side and the seal leg portion is provided on the front lens side. However, the seal groove portion may be provided on the front lens side and the seal leg portion on the housing side. As long as a locking portion having a sealing effect is formed by the housing and the housing, the structure of the locking portions, the locking means and the like are not particularly limited.

  A heat sink 7 fixed to the housing 2 is disposed on the opposite side of the housing 2 from the lamp chamber 3, and a metal support 9 that supports a metal pivot 8 located in the lamp chamber 3 is installed on the heat sink 7. . Thereby, the metal pivot 8, the metal support body 9, and the heat sink 7 are integrated to form a heat conduction path.

  In the lamp chamber 3, a metal support plate 11 having a fitting support portion 10 that is slidably fitted to the metal pivot 8 is disposed. The metal support plate 11 is provided with a slide nut 12. The lamp unit 13 is supported. The lamp unit 13 includes a metal mount plate 14 integrated with the metal support plate 11, an LED light source 15 mounted on the metal mount plate 14, a reflector 16, a light shield 17, a lens holder 18, and a projection lens 19. It is provided.

  Further, an aiming screw 20 whose head is supported by the housing 2 is screwed onto the slide nut 12, and by rotating the aiming screw 20, the metal support plate 11 is moved to the metal pivot 8 as shown in FIG. 2. The lamp unit 13 integrated with the metal support plate 11 is tilted in a desired direction so that the aiming can be adjusted.

  In the vehicular LED lamp having the above-described configuration, when the LED light source 15 is turned on, the light emitted from the LED light source 15 passes through the optical system including the reflector 16, the light shielding body 17, the lens holder 18, and the projection lens 19. The light is emitted from the front lens 1 to the front of the vehicle LED lamp.

  At the same time, as described in “Background Art”, the LED light source self-heats when turned on. Therefore, the temperature of the LED light source itself rises due to the superimposing action of the self-heating of the LED light source and the heat in the air in the lamp chamber 4 heated by the heat, and the luminous efficiency of the LED decreases. As a result, the amount of light emitted from the lamp is reduced.

  Therefore, in the present invention, means for suppressing the temperature rise when the LED light source is turned on is provided, and will be described in detail with reference to FIG.

  First, when the LED light source 15 is turned on, the heat generated by the LED light source 15 moves to the metal mount plate 14 on which the LED light source 15 is mounted. The metal mount plate 14 is formed of a metal material that is a good heat conductor, and the heat transferred from the LED light source 15 to the metal mount plate 14 is conducted through the metal mount plate 14 and moves to the metal support plate 11.

  The metal support plate 11 is also made of a metal material that is a good heat conductor, and the heat transferred to the metal support plate 11 is conducted through the metal support plate 11 to the fitting support portion 10.

  The heat that has reached the fitting support portion 10 moves to the metal pivot 8, and is further transferred from the surface of the heat sink 7 to the air through the heat conduction path including the metal support 9 and the heat sink 7, and is transmitted through the air. Dissipated into the atmosphere.

  Similarly, the heat in the lamp chamber 3 is transferred from the metal support plate 11 through the heat conduction path to the air from the surface of the heat sink 7 and is dissipated into the atmosphere via the air.

  As described above, the vehicular LED lamp according to the present invention is designed so that the lamp unit that supports the LED light source that is the heat generation source simultaneously with the light emitting source can be tilted in a desired direction at the time of aiming to perform aiming adjustment. A heat sink supported in the room and finally dissipating heat generated by the LED light source to the atmosphere is directly fixed to the housing. Therefore, a connecting member such as a socket cover for connecting the lamp body and the heat sink of the support bracket as shown in the conventional example is unnecessary.

  In addition, the metal support plate that supports the lamp unit is supported by the metal pivot together with the aiming screw, which is reduced in weight by removing the relatively heavy heat sink part from the conventional example, and the support member is As the number of the lamps increases, the impact due to vibrations during the running of the vehicle is reduced and dispersed, and the lamp is improved in reliability.

  In addition, the metal pivot contributes to both the aiming operation and the heat dissipation effect, and the use of the metal pivot makes the structure of the lamp mechanically and thermally reliable. It plays.

It is sectional drawing of the LED lamp for vehicles of this invention. Similarly, it is a fragmentary sectional view showing aiming of the LED lamp for vehicles of the present invention. Similarly, it is a reference view showing the process of heat transfer of the LED lamp for vehicles of the present invention. It is sectional drawing of the conventional vehicle lamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front lens 2 Housing 3 Lamp chamber 4 Seal groove part 5 Seal leg part 6 Sealing material 7 Heat sink 8 Metal pivot 9 Metal support 10 Fitting support part 11 Metal support plate 12 Slide nut 13 Lamp unit 14 Metal mount plate 15 LED light source 16 Reflector 17 Light shield 18 Lens holder 19 Projection lens 20 Aiming screw

Claims (2)

  A lamp chamber is formed by at least a front lens and a housing, a lamp unit having at least one LED light source and a metal support plate supporting the lamp unit are located in the lamp chamber, and the metal support plate extends from the housing. And an LED lamp for a vehicle which is supported by a metal pivot connected to a heat sink fixed outside the lamp chamber of the housing.   2. The vehicular LED lamp according to claim 1, wherein the metal support plate is swingably supported by the metal pivot via a fitting support portion formed on the metal support plate.

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