JP5378075B2 - Vehicle headlamp - Google Patents

Description

  The present invention relates to a vehicle headlamp. More specifically, the present invention relates to a technical field in which a shade is formed of a metal material, and a front end of the shade is separated from an attachment portion of a lens holder to which the shade is attached, thereby preventing occurrence of defects due to sunlight.

  In a vehicle headlamp, a lamp unit in which a light emitting diode (LED) is used as a light source inside a lamp outer casing formed by a lamp body and an outer cover that closes an opening of the lamp body There is a type in which is arranged (see, for example, Patent Document 1).

  Such a lamp unit is composed of each part of a light source (light emitting diode), a reflector, a shade, a lens holder, and a projection lens, or a part thereof. A projection lens is attached to the front end of the lens holder, and the front end of the shade is projected. Is matched to the focal point of the lens.

  In the vehicle headlamp as described above, for example, the light emitted from the light emitting diode is reflected toward the projection lens by the reflector, and the projection lens and the outer cover are partially shielded by the shade. The light is transmitted to the outside.

  In the above-described vehicle headlamp in which a light-emitting diode is used as a light source, since the light emitted from the light-emitting diode does not contain heat, it is necessary to consider the influence of heat on the shade located at the focused focal point. It is often formed with a small amount of resin material. Therefore, in a vehicle headlamp in which a light emitting diode is used as a light source, the shade and the lens holder are often integrally formed of a resin material in consideration of a reduction in the number of parts.

JP 2007-207527 A

  By the way, there is a possibility that sunlight enters the inside of the vehicle headlamp while the vehicle is running or stopped. For example, if the optical axis of the vehicle headlamp coincides with the traveling direction of the sun's rays accidentally while traveling or stopped, the path of sunlight is opposite to the path of the light emitted from the light-emitting diode. There is a risk that the light passes through the inside of the vehicle headlamp and is condensed on the front end of the shade that is aligned with the focal point of the projection lens.

  If such sunlight condensing occurs, the shade is formed of a resin material as described above, and therefore there is a risk of causing problems such as melting of the shade and peeling of the paint due to the heat of sunlight. is there.

  In addition, since the shade is integrally formed with the lens holder by a resin material, when the lens holder is continuous with the front end of the shade, when the sunlight is condensed on the front end of the shade, only the shade is used. There is also a risk that the lens holder will melt and the paint will peel off.

  Therefore, an object of the vehicle headlamp of the present invention is to prevent the occurrence of problems due to sunlight.

In order to solve the above-described problems, a vehicle headlamp is used as a light source and a lamp outer casing that includes a lamp body that is opened on one side and an outer cover that is attached to the lamp body and closes the opening. Light-emitting diode, a reflector that reflects the light emitted from the light-emitting diode, a shade that is formed of a metal material and shields a part of the light emitted from the light-emitting diode, and the light emitted from the light-emitting diode a projection lens for projecting, and a lamp unit having a lens holder mounting portion for mounting the shade from behind the projection lens is mounted the front end to the front end portion is provided with formed of a resin material provided, The front end of the shade is aligned with the focal point of the projection lens, and the front end of the shade is the lens. It is obtained so as to be positioned spaced apart from the mounting portion of the holder.

  Therefore, in a vehicle headlamp, when sunlight is incident on a path opposite to the path of light emitted from a light emitting diode, the sunlight is collected at the front end of a shade formed of a metal material. Lighted.

The vehicle headlamp according to the present invention includes a lamp outer casing constituted by a lamp body opened on one side and an outer cover attached to the lamp body and closing the opening, a light emitting diode used as a light source, A reflector that reflects the light emitted from the light emitting diode, a shade that is made of a metal material and shields a part of the light emitted from the light emitting diode, a projection lens that projects the light emitted from the light emitting diode, and and a lamp unit having a lens holder mounting portion for mounting the shade behind the said front portion is provided the projection lens is attached to the front end portion while being formed by a resin material, a front end of the shade is the projection The shade is aligned with the focal point of the lens, and the front end of the shade is separated from the mounting portion of the lens holder. Characterized in that so as to be positioned in.

  Therefore, even when sunlight transmitted through the outer cover and the projection lens is condensed on the front end of the shade, it is possible to prevent the occurrence of problems such as melting of the attachment portion of the shade and the lens holder and peeling of the paint. it can.

  In the invention described in claim 2, since the front end of the shade is positioned in front of the mounting portion of the lens holder, the length of the lamp unit in the front-rear direction can be shortened. The size of the headlamp can be reduced.

  The best mode for carrying out the vehicle headlamp of the present invention will be described below with reference to the accompanying drawings.

  The vehicular headlamp 1 is attached and arranged at both left and right end portions of the front end portion of the vehicle body.

  As shown in FIG. 1, a vehicle headlamp 1 includes, for example, a lamp outer casing 4 that includes a lamp body 2 that is opened forward and an outer cover 3 that is attached to the front end of the lamp body 2. The inside is formed as a lamp chamber 5, and a lamp unit 6 is arranged in the lamp chamber 5.

  A holding member 7 is disposed in the lamp chamber 5 via an optical axis adjusting mechanism 8 so as to be tiltable in the horizontal direction and the vertical direction.

  The holding member 7 is formed of a metal material having high thermal conductivity, and includes a base portion 9 facing in the front-rear direction and a mounting protrusion 10 protruding forward from a central portion in the vertical direction of the base portion 9. .

  Supported portions 9a, 9a, 9a are provided at both upper and lower ends of the base portion 9 (only two supported portions 9a, 9a are shown in FIG. 1). On the rear surface of the base part 9, heat radiation fins 9b, 9b,...

  A light emitting unit 11 is disposed on the upper surface of the mounting protrusion 10.

  The light emitting unit 11 includes a circuit board 11a, a light emitting diode 11b mounted on the circuit board 11a and functioning as a light source, and a protective cover 11c that closes and protects the light emitting diode 11b.

  A reflector 12 is attached to the rear end portion on the upper surface of the attachment protrusion 10. The inner surface of the reflector 12 is formed as a reflecting surface 12a.

  A lens holder 13 made of a resin material is attached to the front surface of the attachment protrusion 10. The lens holder 13 is provided with a rear half portion as an attachment portion 13a, and a front half portion is provided as a holding projection 13b protruding forward from the attachment portion 13a.

  A shade 14 is attached to the upper surface of the attachment portion 13 a of the lens holder 13. The shade 14 is made of a metal material, and the front end 14a is positioned in front of the front end of the attachment portion 13a. The shade 14 has a function of shielding part of the light emitted from the light emitting diode 11b, and there is a type that is painted black and has a function of absorbing light, and a type that is mirror-finished and has a function of reflecting light.

  A projection lens 15 is attached to the front end portion of the lens holder 13.

  The focal point of the projection lens 15 coincides with the front end 14 a of the shade 14. Therefore, the front end 14a of the shade 14 functions as a condensing point where the light emitted from the light emitting diode 11b is condensed. The front end 14 a of the shade 14 that functions as a condensing point coincides with the front focal point of the reflector 12. The rear focal point of the reflector 12 is coincident with the emission point of the light emitting diode 11b.

  In the vehicle headlamp 1, the lamp unit 6 is configured by the light emitting unit 11, the reflector 12, the lens holder 13, the shade 14, and the projection lens 15 described above.

  The optical axis adjusting mechanism 8 includes aiming screws 16 and 16 (only one aiming screw 16 is shown in FIG. 1) and a leveling actuator 17.

  The aiming screws 16 and 16 are spaced apart from each other in the upper and lower parts of the lamp chamber 5 and are composed of rotation operation portions 18 and 18 and shaft portions 19 and 19 protruding forward from the rotation operation portions 18 and 18, respectively. The front end portions of the shaft portions 19 and 19 are provided as screw shaft portions 19a and 19a.

  The aiming screws 16 and 16 are rotatably supported by rotation operation portions 18 and 18 at the rear end portion of the lamp body 2, and screw shaft portions 19 a and 19 a are respectively screwed into supported portions 9 a and 9 a above the holding member 7. Are combined.

  The leveling actuator 17 includes a drive unit 20 and a shaft portion 21 protruding forward from the drive unit 20, and a front end portion of the shaft portion 21 is provided as a screw shaft portion 21a. In the leveling actuator 17, the screw shaft portion 21 a is screwed to the supported portion 9 a on the lower side of the holding member 7.

  In the vehicle headlamp 1, when the aiming screw 16 connected to the supported portion 9 a is rotated by the rotation operation portion 18 being operated by a jig such as a driver (not shown), the direction is changed in accordance with the rotation direction. The holding member 7 is tilted with the supported portions 9a, 9a as fulcrums, and the optical axis adjustment (aiming adjustment) of the lamp unit 6 is performed.

  Further, when the shaft portion 21 connected to the supported portion 9a is rotated by the driving force of the driving portion 20, the holding member 7 moves up and down with the other supported portions 9a and 9a as fulcrums in the direction corresponding to the rotation direction. The optical axis of the lamp unit 6 is adjusted (leveling adjustment).

  In the vehicle headlamp 1 configured as described above, when light is emitted from the light emitting diode 11 b of the lamp unit 6, the emitted light is reflected by the reflector 12 and partly shielded by the shade 14. Then, the light passes through the projection lens 15 and the outer cover 3 and is irradiated forward.

  On the other hand, in the vehicle headlamp 1, as shown in FIG. 2, when sunlight S is incident on a path opposite to the path of light emitted from the light emitting diode 11 b, the sunlight S is formed of a metal material. The light is condensed on the front end (condensing point) 14 a of the shade 14. At this time, since the shade 14 is formed of a metal material, the shade 14 is not melted by the heat contained in the sunlight or peeling of the paint does not occur. Further, since the front end 14a of the shade 14 is positioned away from the mounting portion 13a of the lens holder 13, the sunlight S is not condensed on the mounting portion 13a of the lens holder 13, and the mounting portion 13a is also exposed to sunlight. It does not melt or peel off due to the contained heat.

  As described above, in the vehicle headlamp 1, the shade 14 having the condensing point (front end 14a) coincident with the focal point of the projection lens 15 is formed of a metal material, and the front end 14a of the shade 14 is The lens holder 13 is positioned away from the mounting portion 13a.

  Therefore, even when sunlight transmitted through the outer cover 3 and the projection lens 14 is collected on the front end 14 a of the shade 14, there is a problem such as melting of the shade 14 and the mounting portion 13 a of the lens holder 13 or peeling of the paint. Can be prevented.

  Further, since the lens holder 13 is formed of a resin material, the projection lens 14 can be attached to the lens holder 13 by laser welding, and the attachment strength of the projection lens 14 to the lens holder 13 can be improved and work in the attachment work can be performed. It is possible to improve the performance.

  Furthermore, since the front end 14a of the shade 14 is positioned in front of the mounting portion 13a of the lens holder 13, the length of the lamp unit 6 in the front-rear direction can be reduced accordingly, and the vehicle headlamp 1 Can be miniaturized.

  The shapes and structures of the respective parts shown in the best mode for carrying out the invention described above are merely examples of the embodiments performed in practicing the present invention. The range should not be interpreted in a limited way.

FIG. 2 shows the best mode of the vehicle headlamp according to the present invention together with FIG. 2, and is a schematic longitudinal sectional view of the vehicle headlamp. It is a key map showing the state where sunlight was condensed on the front end of a shade.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle headlamp, 2 ... Lamp body, 3 ... Outer cover, 4 ... Lamp housing, 6 ... Lamp unit, 11b ... Light emitting diode, 12 ... Reflector, 13 ... Lens holder, 13a ... Mounting part, 14 ... Shade, 14a ... front end, 15 ... projection lens

Claims (2)

A lamp outer casing constituted by a lamp body opened on one side and an outer cover attached to the lamp body and closing the opening;
A light emitting diode used as a light source, a reflector that reflects light emitted from the light emitting diode, a shade that is formed of a metal material and shields a part of the light emitted from the light emitting diode, and is emitted from the light emitting diode a projection lens for projecting the light, a lamp unit having a lens holder mounting part is provided with the projection lens is attached to the front end portion attached to the shade rearwardly from the front end while being formed of a resin material With
The front end of the shade is aligned with the focal point of the projection lens;
A vehicular headlamp characterized in that a front end of the shade is positioned away from a mounting portion of the lens holder. The vehicle headlamp according to claim 1, wherein a front end of the shade is positioned in front of an attachment portion of the lens holder.

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