JP2011100555A - Headlight for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headlight for a vehicle preventing occurrence of defects due to the sunlight. <P>SOLUTION: The headlight mounts a lamp unit 6 which is equipped with a light-emitting diode 11b used as a light source, a reflector 12 reflecting light emitted from the light-emitting diode, an optical member 13 made of a transparent resin material having a function to shield a part of light emitted from the light-emitting diode, and a projection lens 16 transmitting and projecting the light emitted from the light-emitting diode. The optical member is equipped with a base part 14 located at a rear side with a vicinity of the focal point of the projection lens as a reference, and a lens holding part 15 protruded toward a front side from the base part and attaching the projection lens at the tip. A shading part 14b is formed by surface treatment in a region extending toward the rear from the spot near the focal point of the projection lens at the base part of the optical member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle headlamp. Specifically, the present invention relates to a technical field in which an optical member having a function of shielding a part of light emitted from a light source is formed of a transparent resin material to prevent occurrence of problems due to incidence of sunlight.

  BACKGROUND ART A vehicle headlamp includes 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 a cover that closes an opening of the lamp body. There is an arranged type (see, for example, Patent Document 1).

  Such a lamp unit is composed of various parts such as a light source (light emitting diode), a reflector, a shade, and a projection lens.

  In the vehicular headlamp as described above, for example, light emitted from the light emitting diode is reflected by the reflector toward the projection lens, and partially passes through the projection lens and the cover while being shielded by the shade. Is irradiated to the outside.

  In the above vehicle headlamp using a light emitting diode 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 having a condensing point portion. In many cases, it is made of a non-transparent resin material having a light shielding function.

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 a vehicle headlamp accidentally turns in the direction in which the sun is positioned while traveling or stopping, sunlight enters the lamp unit through the cover and the projection lens and is projected by the projection lens. There is a risk of light being condensed inside the lamp unit.

  If the above-described sunlight concentration occurs inside the lamp unit, the shade is formed of the resin material as described above, and therefore, the problem of melting the shade is caused by the heat of sunlight. There is a fear. In particular, since the shade is often formed of a resin material such as black in order to ensure light-shielding properties, there is an inconvenience that it is easy to absorb the heat of sunlight and to be melted.

  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 problem, a vehicle headlamp is used as a light source and a lamp outer casing formed by a lamp body having an opening on one side and a cover attached to the lamp body and closing the opening. A light emitting diode, a reflector that reflects light emitted from the light emitting diode, an optical member that is formed of a transparent resin material and has a function of shielding a part of the light emitted from the light emitting diode, and the light emitting diode A lamp unit having a projection lens that transmits and projects the light emitted from the base, and the optical member has a base portion located on the rear side with respect to the vicinity of the focal point of the projection lens, and a front side from the base portion. And a lens holding part to which the projection lens is attached at the tip part, and the projection level at the base part of the optical member. The surface treatment region extending from the vicinity of the focal point of's rearward in which the light shielding portion is formed.

  Therefore, in the vehicle headlamp, when sunlight is incident on the inside of the lamp unit, the sunlight is transmitted through the optical member.

  The vehicle headlamp according to the present invention includes a lamp outer casing configured by a lamp body having an opening on one side and a cover attached to the lamp body to close the opening, a light emitting diode used as a light source, and the light emitting device. A reflector that reflects the light emitted from the diode, an optical member that is formed of a transparent resin material and has a function of shielding a part of the light emitted from the light emitting diode, and transmits the light emitted from the light emitting diode A lamp unit having a projection lens for projecting, and the optical member protrudes forward from the base portion positioned on the rear side with respect to the vicinity of the focal point of the projection lens, and is projected to the tip portion from the base portion. A lens holding portion to which the projection lens is attached, and from the vicinity of the focal point of the projection lens in the base portion of the optical member. The surface treatment region extending characterized in that the light-shielding portion is formed.

  Therefore, the melting of the optical member does not occur due to the heat of sunlight, and the occurrence of problems due to the incidence of sunlight can be prevented.

  In the invention described in claim 2, a planar portion facing upward along the optical axis from the vicinity of the focal point of the projection lens is formed on the base portion of the optical member, and the light shielding portion is formed on the planar portion by vapor deposition. It is formed as a reflective surface.

  Therefore, a part of the light emitted from the light emitting diode is reflected by the light shielding portion and irradiated forward, so that the light use efficiency can be improved.

  In the invention described in claim 3, the projection lens is formed of a resin material similar to the resin material of the optical member, and the projection lens is attached to the lens holding portion of the optical member by laser welding.

  Therefore, it is possible to ensure good bonding properties of the projection lens to the optical member, and to improve the bonding strength between them and facilitate the bonding operation.

  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, an interior of a lamp outer casing 4 that includes a lamp body 2 that opens forward and a cover 3 that is attached to the front end of the lamp body 2. 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 that faces in the front-rear direction, and a mounting protrusion 10 that protrudes forward from a central portion in the vertical direction of the base portion 9.

  Supported portions 9a, 9a and 9a are provided at both upper and lower ends of the base 9 (only two supported portions 9a and 9a are shown in FIG. 1). Radiating fins 9b, 9b,... Projecting rearward (only one radiating fin 9b is shown in FIG. 1) are provided on the rear surface of the base 9 so as to be spaced apart from each other.

  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.

  An optical member 13 made of a transparent resin material is attached to the front surface of the attachment protrusion 10. The optical member 13 has a function of shielding a part of the light emitted from the light emitting diode 11b, and the base portion 14 and the lens holding portion 15 protruding forward from the lower end portion of the base portion 14 are integrally formed. It consists of The base portion 14 is formed, for example, in a block shape and has a flat surface portion 14a facing upward.

  On the flat surface portion 14a of the optical member 13, for example, a light shielding portion 14b is formed by a surface treatment such as aluminum vapor deposition, and the light shielding portion 14b is a reflecting surface. By forming the light shielding part 14b on the base part 14, the optical member 13 functions as a shade for shielding a part of the light emitted from the light emitting diode 11b.

  A projection lens 16 is attached to the front end portion of the lens holding portion 15 in the optical member 13.

  The projection lens 16 is formed of, for example, a transparent resin material similar to the optical member 13, and the focal point substantially coincides with the front end 14 c of the flat surface portion 14 a of the optical member 13. Therefore, the front end 14c of the flat surface portion 14a functions as a condensing point where light emitted from the light emitting diode 11b and reflected by the reflecting surface 12a of the reflector 12 is collected. The front end 14 c that functions as a condensing point is matched 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 optical member 13, and the projection lens 16 described above.

  The optical axis adjusting mechanism 8 has aiming screws 17 and 17 (only one aiming screw 17 is shown in FIG. 1) and a leveling actuator 18.

  The aiming screws 17 and 17 are spaced apart from each other in the upper part of the lamp chamber 5 and are composed of rotation operation parts 19 and 19 and shaft parts 20 and 20 projecting forward from the rotation operation parts 19 and 19, respectively. Front end portions of the shaft portions 20 and 20 are provided as screw shaft portions 20a and 20a.

  The aiming screws 17, 17 are rotatably supported at the rear end portion of the lamp body 2 by the rotation operating portions 19, 19, and the screw shaft portions 20 a, 20 a are respectively screwed by the supported portions 9 a, 9 a on the upper side of the holding member 7. Are combined.

  The leveling actuator 18 includes a drive portion 21 and a shaft portion 22 protruding forward from the drive portion 21, and a front end portion of the shaft portion 22 is provided as a screw shaft portion 22 a. In the leveling actuator 18, the screw shaft portion 22 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 17 connected to the supported portion 9 a is rotated by operating the rotation operation portion 19 with a jig such as a driver (not shown), the direction is changed according to 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 22 connected to the supported portion 9a is rotated by the driving force of the driving portion 21, 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 optical member 13. In this state, the light passes through the projection lens 16 and the cover 3 and is irradiated forward.

  At this time, most of the light emitted from the light emitting diode 11 b is condensed by the reflector 12 onto the front end 14 c of the optical member 13 and irradiated forward. In addition, the light emitted from the light emitting diode 11b includes light Q (see FIG. 2) that is reflected by the reflector 12 but is not collected at the front end 14c of the optical member 13, and the light Q is formed as a reflective surface. The light is reflected by the light shielding part 14b and irradiated forward.

  On the other hand, in the vehicle headlamp 1, as shown in FIG. 2, when sunlight S is incident on the inside of the lamp unit 6 through the path opposite to the path of the light emitted from the light emitting diode 11b, S may be condensed inside the lamp unit 6. A line P shown in FIG. 2 is a line that connects the condensing points of the sunlight S.

  When the sunlight S enters the lamp unit 6, for example, when the condensing point is in the range of B to D in the line P, the condensing point is the front surface 14 d of the base portion 14 of the optical member 13. It exists in the position near. Therefore, although sunlight S having high thermal energy is incident on the optical member 13, the sunlight S is transmitted through the optical member 13 because the optical member 13 is formed of a transparent material. At this time, there is a possibility that part of the sunlight S incident on the inside of the optical member 13 is directed to the flat part 14a, but the light Sa that is directed to the flat part 14a is shielded by the light shielding part 14b and is directed to the light emitting diode 11b side. Progress is regulated.

  Further, when sunlight S is incident on the inside of the lamp unit 6, for example, when the condensing point is in the range of D to I in the line P, the condensing point is separated from the optical member 13. Although the thermal energy incident on the optical member 13 is low, the sunlight S is transmitted through the optical member 13 also in this case.

As described above, in the vehicle headlamp 1, since the optical member 13 is formed of a transparent material, when the sunlight S enters the lamp unit 6, the incident sunlight The light S is transmitted through the optical member 13. Therefore, the optical member 13 that functions as a shade is not melted by the heat of sunlight, and the occurrence of problems due to the incidence of sunlight can be prevented.

  Moreover, since the light-shielding part 14b is formed by surface treatment in the plane part 14a, the advance to the light emitting diode 11b side of the sunlight S which injected into the optical member 13 is controlled.

  Therefore, the light emitting diode 11b is not adversely affected by the heat of sunlight, and the occurrence of problems due to the incidence of sunlight can be prevented.

  Further, since the light shielding part 14b is formed as a reflection surface by vapor deposition on the flat part 14a of the optical member 13, a part of the light emitted from the light emitting diode 11b is reflected by the light shielding part 14b and irradiated forward. The utilization efficiency can be improved.

  In addition, since the projection lens 16 is formed of a resin material similar to the resin material of the optical member 13 and the projection lens 16 is attached to the lens holding portion 15 of the optical member 13 by laser welding, the optical member 13 of the projection lens 16 is used. Therefore, it is possible to secure a good bondability with respect to the two, and to improve the bonding strength between the two and facilitate the bonding operation.

  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 conceptual diagram which shows the path | route etc. of the sunlight which injected into the inside of a lamp unit.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle headlamp, 2 ... Lamp body, 3 ... Cover, 4 ... Lamp housing, 6 ... Lamp unit, 11b ... Light emitting diode, 12 ... Reflector, 13 ... Optical member, 14 ... Base part, 14a ... Plane Part, 14b ... light-shielding part, 15 ... lens holding part, 16 ... projection lens

Claims (3)

A lamp outer casing constituted by a lamp body having an opening on one side and a 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, and an optical member that is formed of a transparent resin material and has a function of shielding part of the light emitted from the light-emitting diode; A lamp unit having a projection lens that transmits and projects the light emitted from the light emitting diode, and
The optical member has a base portion located on the rear side with respect to the vicinity of the focal point of the projection lens, and a lens holding portion that protrudes forward from the base portion and has the projection lens attached to the tip portion.
A vehicular headlamp characterized in that a light-shielding portion is formed by surface treatment in a region extending backward from the vicinity of the focal point of the projection lens in the base portion of the optical member. Forming a planar portion facing upward along the optical axis from the vicinity of the focal point of the projection lens on the base portion of the optical member;
The vehicle headlamp according to claim 1, wherein the light shielding portion is formed as a reflecting surface by vapor deposition on the flat portion. The projection lens is formed of a resin material similar to the resin material of the optical member,
The vehicle headlamp according to claim 1 or 2, wherein the projection lens is attached to a lens holding portion of the optical member by laser welding.

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