Electric lamp and discharge devices – With optical device or special ray transmissive envelope – Reflector
Patent
1994-12-06
1996-11-12
Patel, Nimeshkumar
Electric lamp and discharge devices
With optical device or special ray transmissive envelope
Reflector
313113, 313111, 362263, 362298, 362299, F21V 700, F21V 712
Patent
active
055743285
ABSTRACT:
An automobile headlamp apparatus comprising a direct current driven discharge lamp surrounded by a concave main mirror which confronts a concave spheroidal sub mirror. The main mirror has a first focus point located substantially at a center of a discharge gap of the discharge lamp between the cathode and anode thereof, while the sub mirror has first and second focus points and an opening therein around the optical axis of the sub mirror. The first and second focus points of the sub mirror are arranged to be substantially on the tips of the cathode and anode of the discharge lamp, respectively. A convex lens may be included to condense the light from the main mirror, wherein the main mirror has a second focus point at a focus point of the convex lens. A shade forming a favorable illumination pattern may be included. In one embodiment, a diagonal mirror is inserted between the main mirror and the convex lens to bend the light from the discharge lamp. An optical light guide may be provided between the diagonal mirror and the convex lens, and/or the discharge tube may be attached to a completed assembly of the main mirror and sub-mirror.
REFERENCES:
patent: 4241382 (1980-12-01), Daniel
patent: 4460939 (1984-07-01), Murkami et al.
patent: 5021928 (1991-06-01), Daniel
patent: 5099168 (1992-03-01), Holten
patent: 5469337 (1995-11-01), Cassarly
Nippondenso Co., Ltd
Patel Nimeshkumar
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