Vehicle headlamp

Abstract

A first LED unit, a first reflector, a second LED unit, a second reflector, and a light source mount which supports the first LED unit and the second LED unit are provided in a light chamber. The first reflector is formed integrally with a projection lens and forwardly reflects direct light outputted from a first LED to the central axis of the lens. The second reflector is formed integrally with the projection lens and forwardly reflects direct light outputted from a second LED. The light source mount has a fixing portion adapted to perform the positioning of the projection lens, the first reflector and the second reflector, which are formed integrally with a connecting member, in the direction of the central axis of the lens. The light source mount also has a positioning projection and positioning recesses, which are adapted to perform the positioning of the projection lens, the first reflector and the second reflector in a direction perpendicular to the central axis.

Description

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic exploded perspective view illustrating a vehicle headlamp according to an embodiment of the invention;

FIG. 2 is a schematic longitudinal cross-sectional view illustrating the vehicle headlamp shown in FIG. 1;

FIG. 3 is a front view of a light fitting unit shown in FIG. 2;

FIG. 4 is a cross-sectional view illustrating the light fitting unit, which is taken on line IV-IV in the direction of an arrow shown in FIG. 3;

FIG. 5 is a cross-sectional view illustrating the light fitting unit, which is taken on line V-V in the direction of an arrow shown in FIG. 3;

FIG. 6 is a cross-sectional view illustrating the light fitting unit, which is taken on line VI-VI in the direction of an arrow shown in FIG. 3;

FIG. 7 is a cross-sectional view illustrating a primary part of the light fitting unit shown in FIG. 2;

FIG. 8 is an exploded perspective view illustrating a primary part of the light fitting unit shown in FIG. 1;

FIG. 9 is a front view illustrating a light source mount shown in FIG. 8;

FIG. 10A is an exploded view illustrating a projection lens and a reflector shown in FIG. 1;

FIG. 10B is an assembling view illustrating the projection lens and the reflector shown in FIG. 1;

FIG. 11 is an exploded perspective view illustrating an attachment shown in FIG. 8;

FIG. 12 is an exploded perspective view illustrating the attachment shown in FIG. 11, which is taken from below.

FIG. 13 is a perspective view illustrating an assembled state of the attachment shown in FIG. 1; and

FIG. 14 is an exploded perspective view illustrating a light source unit of a vehicle headlamp in the related art.

Claims

1. A vehicle headlamp comprising: a projection lens disposed on a central axis of a lens extending in a front-rear direction of a vehicle;an LED unit including: a semiconductor light emitting element disposed in rear of the projection lens,a heat radiating board having a top surface to which the semiconductor light emitting element is directly fixed, anda contact formed on the heat radiating board to receive electric power causing the semiconductor light emitting element to emit light;a reflector formed integrally with the projection lens, wherein the reflector is adapted to forwardly reflect direct light emitted from the semiconductor light emitting element to a central axis of the lens; anda light source mount having: a unit support surface that is in direct contact with a bottom surface of the heat radiating board and that supports the LED unit,a unit positioning portion adapted to directly abut against a side surface of the heat radiating board and to position the LED unit,a reference surface adapted to position the projection lens and the reflector in a direction of the central axis of the lens, anda positioning section adapted to position the projection lens and the reflector in a direction perpendicular to the central axis of the lens.

2. The vehicle headlamp according to claim 1, further comprising: a shade provided between the projection lens and the semiconductor light emitting element,wherein the shade is operable to block off a part of light reflected from the reflector to form a cutoff line in a light distribution pattern based on light passed through the projection lens.

3. The vehicle headlamp according to claim 1, further comprising: an attachment having an electric power feeding portion,wherein the electric power feeding portion is adapted to receive electric power, which causes the semiconductor light emitting element to emit light, from an external power plug andto supply the electric power to the contact,wherein the attachment is operable to hold the LED unit in a state in which the bottom surface and a part of the side surface of the heat radiating board is exposed, andin which a space above the light emitting element is open.

4. The vehicle headlamp according to claim 2, further comprising an attachment having an electric power feeding portion,wherein the electric power feeding portion is adapted to receive electric power, which causes the semiconductor light emitting element to emit light, from an external power plug andto supply the electric power to the contact,wherein the attachment is operable to hold the LED unit in a state in which the bottom surface and a part of the side surface of the heat radiating board is exposed, andin which a space above the light emitting element is open.

5. The vehicle headlamp according to claim 1, further comprising: a lamp body; anda cover which forms a chamber with the lamp body,wherein the projection lens, the LED unit, the reflector, and the light source mount are housed in the chamber.

6. A vehicle lamp comprising: a projection lens disposed on a central axis of a lens extending in a front-rear direction of a vehicle;a first LED unit including a first semiconductor light emitting element disposed in rear of the projection lens,a first heat radiating board having a top surface to which the first semiconductor light emitting element is directly fixed, anda first contact formed on the first heat radiating board to receive electric power causing the first semiconductor light emitting element to emit light;a first reflector formed integrally with the projection lens,wherein the first reflector is adapted to forwardly reflect direct light emitted from the first semiconductor light emitting element to a central axis of the lens;a second LED unit including a second semiconductor light emitting element disposed substantially back to back with the first semiconductor light emitting element,a second heat radiating board having a top surface to which the second semiconductor light emitting element is directly fixed, anda second contact formed on the second heat radiating board to receive electric power causing the second semiconductor light emitting element to emit light;a second reflector formed integrally with the projection lens,wherein the second reflector is adapted to forwardly reflect direct light emitted from the second semiconductor light emitting element; anda light source mount having first and second unit support surfaces that are in direct contact with bottom surfaces of the first and second heat radiating boards, respectively, andthat respectively support the first and second LED units,first and second unit positioning portions which directly abut against side surfaces of the first and second heat radiating boards, respectively, andwhich position the first and second LED units,a reference surface adapted to position the projection lens and the first and second reflectors in a direction of the central axis of the lens, anda positioning section adapted to position the projection lens and the first and second reflectors in a direction perpendicular to the central axis of the lens.

7. The vehicle headlamp according to claim 6, further comprising: a shade provided between the projection lens and the first semiconductor light emitting element,wherein the shade is operable to block off a part of light reflected from the first reflector to form a cutoff line in a light distribution pattern based on light passed through the projection lens.

8. The vehicle headlamp according to claim 6, further comprising: a first attachment having an first electric power feeding portion adapted to receive electric power, which causes the first semiconductor light emitting element to emit light, from an external power plug andto supply the electric power to the first contact; anda second attachment having a second electric power feeding portion adapted to receive electric power, which causes the second semiconductor light emitting element to emit light, from the external power plug andto supply the electric power to the second contact,wherein the first attachment is operable to hold the LED unit in a state in which the bottom surface and a part of the side surface of the first heat radiating board is exposed, andin which a space above the first light emitting element is open, andthe second attachment is operable to hold the second LED unit in a state in which the bottom surface and a part of the side surface of the second heat radiating board is exposed, andin which a space above the second light emitting element is open.

9. The vehicle headlamp according to claim 7, further comprising: a first attachment having an first electric power feeding portion adapted to receive electric power, which causes the first semiconductor light emitting element to emit light, from an external power plug andto supply the electric power to the first contact; anda second attachment having a second electric power feeding portion adapted to receive electric power, which causes the second semiconductor light emitting element to emit light, from the external power plug andto supply the electric power to the second contact,wherein the first attachment is operable to hold the LED unit in a state in which the bottom surface and a part of the side surface of the first heat radiating board is exposed, andin which a space above the first light emitting element is open, andthe second attachment is operable to hold the second LED unit in a state in which the bottom surface and a part of the side surface of the second heat radiating board is exposed, andin which a space above the second light emitting element is open.

10. The vehicle headlamp according to claim 6, further comprising: a lamp body; anda cover which forms a chamber with the lamp body,wherein the projection lens, the first LED unit, the first reflector, the second LED unit, the second reflector, and the light source mount are housed in the chamber.