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US 6,267,489 B1Granted
Vehicular headlamp having improved bulb support
AssigneeKoito Manufacturing Co., Ltd.
InventorKaoru Yamamoto
Life of this patent
Estimating the term…
Abstract
A vehicular headlamp equipped with a light source bulb composed of a bulb body and a bulb supporting portion for supporting the bulb body and with a reflector in which a bulb insertion hole for insertion of the bulb body of the light source bulb is formed. An annular wall is formed around the bulb insertion hole of the reflector and a bulb abutment face on which the body supporting portion is made to abut from behind is formed in the annular wall. A notch portion that is notched forwards from the bulb abutment face is formed in the annular wall. Accordingly, the heat generated within the reflector is dissipated into the external space and the possibility of heat deformation of the reflector is reduced.
Claims8
A vehicular headlamp assembly, comprising:
- a light source bulb comprising a bulb body, a bulb supporting portion for supporting said bulb body;
- and
- a reflector,
- said reflector having an ellipsoid shape terminating at an open forward end and a smaller open rear end,
- a bulb insertion hole for insertion of said bulb body of said light source bulb being formed in said smaller open rear end of said reflector,
- said reflector comprising an annular wall on an exterior thereof disposed around said bulb insertion hole and axially extending along a optical axis of said reflector,
- said annular wall comprising a bulb abutment face on an exterior surface thereof, said exterior surface being substantially perpendicular to said optical axis of said reflector,
- said bulb supporting portion of said light source bulb abutting said bulb abutment face from a direction of bulb insertion, and
- said annular wall having at least one notch portion that extends though said annular wall, said notch portion comprising an area indented from said bulb abutment face and extending forward from said bulb abutment face to said bulb insertion hole on the exterior surface of said reflector, wherein said notch portion facilitates heat dissipation by allowing heat to escape from inside said reflector.
6 more elements
A vehicular headlamp assembly comprising:
- a light source bulb comprising a bulb body, a bulb supporting portion for supporting said bulb body;
- a reflector;
- said reflector having an ellipsoid shape terminating at an open forward end and a smaller open rear end,
- a bulb insertion hole for insertion of said bulb body of said light source bulb being formed in said smaller open rear end of said reflector,
- said reflector comprising an annular wall on an exterior thereof disposed around said bulb insertion hole and axially extending along a optical axis of said reflector,
- said annular wall comprising a bulb abutment face on an exterior surface thereof, said exterior surface being substantially perpendicular to said optical axis of said reflector,
- said bulb supporting portion of said light source bulb abutting said bulb abutment face from a direction of bulb insertion,
- said annular wall having at least one notch provided therein, said notch portion comprising an area indented from said bulb abutment face and extending to said bulb insertion hole on the exterior surface of said reflector;
- and
- a heat radiation fin disposed in said reflector and extending axially along an outer peripheral face of the annular wall and over a substantial portion of said reflector.
7 more elements
A vehicular headlamp assembly comprising:
- a light source bulb comprising a bulb body, a bulb supporting portion for supporting said bulb body;
- and
- a reflector;
- said reflector having an ellipsoid shape terminating at an open forward end and a smaller open rear end,
- a bulb insertion hole for insertion of said bulb body of said light source bulb being formed in said smaller open rear end of said reflector,
- said reflector comprising an annular wall on an exterior thereof disposed around said bulb insertion hole and axially extending along a optical axis of said reflector,
- said annular wall comprising a bulb abutment face on an exterior surface thereof, said exterior surface being substantially perpendicular to said optical axis of said reflector,
- said bulb supporting portion of said light source bulb abutting said bulb abutment face from a direction of bulb insertion,
- said annular wall having at least one notch portion provided therein, said notch portion comprising an area indented from said bulb abutment face and extending to said bulb insertion hole on the exterior surface of said reflector,
- wherein said bulb supporting portion of said light source bulb abuts said bulb abutment face at three locations along a circumference of said annular wall;
- and
- said notch portion is provided at three locations in said annular wall that are offset from respective ones of said three bulb supporting portion abutting locations,
- further comprising a heat radiation fin disposed in said reflector and extending axially along an outer peripheral face of the annular wall and over a substantial portion of said reflector.
10 more elements
Dependencies are inferred from the claim text.