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US 5,188,444 AGranted
Vehicular headlamp
AssigneeKoito Manufacturing Co., Ltd.
InventorsHiroyuki Makita, Shuichi Kochi
Life of this patent
Estimating the term…
Abstract
A vehicular headlamp employing a discharge bulb as a light source in which a lighting circuit for the bulb, including an ignitor, is secured to a lamp housing in such a manner as to cover a rear opening in the housing. This arrangement results in significantly reduced danger of shock and reduced radiation of electromagnetic noise. In another embodiment of the invention, a lighting-circuit-accommodating unit containing a lighting circuit is bayonet-engaged with a circular opening in the rear wall of a lamp body, and also is fixed to the lamp body by a second fixing device in such a manner as to prevent rotation of the lighting-circuit-accommodating unit relative to the lamp body.
Claims22
A vehicular headlamp, comprising:
- a lamp housing having a front opening and a rear opening;
- a lens covering said front opening of said lamp housing;
- a reflector mounted in said lamp housing;
- a discharge lamp mounted on said reflector;
- a lighting circuit comprising an ignitor for said discharge lamp, said lighting circuit being secured to said lamp housing in such a manner as to cover said rear opening;
- a casing accommodating said lighting circuit, said casing being made of a material having an electromagnetic shielding effect selected from the group consisting of a material comprising a synthetic resin containing conductive particles, and a material comprising a synthetic resin coated with an electrically conductive paint;
- and
- lead wires connecting said discharge lamp to said lighting circuit.
5 more elements
A vehicular headlamp, comprising:
- a lamp body having a circular opening formed in a rear wall thereof;
- an electrically conductive coating on an outer surface of said lamp body;
- a discharge bulb mounted in said lamp body;
- a lighting-circuit-accommodating unit comprising a casing and a lighting circuit mounted in said casing;
- lead wires for connecting said discharge bulb to said lighting circuit;
- means for bayonet-engaging said lighting-circuit-accommodating unit with said circular opening from a rear side of said circular opening;
- and
- means for fixing said lighting-circuit-accommodating unit to said lamp body for preventing said lighting-circuit-accommodating unit from rotating relative to said circular opening.
5 more elements
A vehicular headlamp, comprising:
- a lamp body having a circular opening formed in a rear wall thereof;
- a discharge bulb mounted in said lamp body;
- a lighting-circuit-accommodating unit comprising a casing and a lighting circuit mounted in said casing;
- lead wires for connecting said discharge bulb to said lighting circuit;
- means for bayonet-engaging said lighting-circuit-accommodating unit with said circular opening from a rear side of said circular opening,s aid bayonet-engaging means comprising a cylindrical extension fixed to said casing, and a cylindrical protrusion extending rearward from said rear wall of said lamp body, said circular opening being formed in said circular protrusion, said cylindrical extension being received in said circular opening, a flange and a plurality of outward protrusions formed on an outer wall of a front end portion of said cylindrical extension, and a plurality of inward protrusions formed alternately with cuts on a peripheral portion of said rear opening, said outward protrusions of said cylindrical extension being engaged with said inward protrusions on said peripheral portion of said rear opening;
- and
- means for fixing said lighting-circuit-accommodating unit to said lamp body for preventing said lighting-circuit-accommodating unit from rotating relative to said circular opening.
4 more elements
A vehicular headlamp, comprising:
- a lamp housing having a front opening and a rear opening;
- a lens covering said front opening of said lamp housing;
- a reflector mounted in said lamp housing;
- a discharge lamp mounted on said reflector;
- a lighting circuit comprising an ignitor for said discharge lamp, said lighting circuit being secured to said lamp housing in such a manner as to cover said rear opening;
- a casing accommodating said lighting circuit, said casing comprising a box-shaped body portion having a front opening and a cover closing said front opening;
- an electrically conductive shield plate provided on an inner surface of said cover;
- and
- lead wires connecting said discharge lamp to said lighting circuit.
6 more elements
A vehicular headlamp, comprising:
- a lamp housing having a front opening and a rear opening, said housing having an engaging edge member extending inward from an inner surface of said lamp housing slightly set back from said rear opening;
- a lens covering said front opening of said lamp housing;
- a reflector mounted in said lamp housing;
- a discharge lamp mounted on said reflector;
- a lighting circuit comprising an ignitor for said discharge lamp, said lighting circuit being secured to said lamp housing in such a manner as to cover said rear opening;
- a casing accommodating said lighting circuit, said casing comprising a box-shaped body portion having a front opening and a cover closing said front opening, said casing body having a plurality of engaging pieces arranged along a front edge thereof at predetermined intervals and extending forward therefrom, said engaging pieces having engaging pawls at end portions thereof, and a retaining edge extending outwardly from said front opening, and a rubber packing disposed between and compressed by said engaging edge and said retaining edge;
- and
- lead wires connecting said discharge lamp to said lighting circuit.
5 more elements
Dependencies are inferred from the claim text.