Illumination – Light source and modifier – Including reflector
Patent
1992-09-16
1993-10-12
Makay, Albert J.
Illumination
Light source and modifier
Including reflector
362 61, 362263, 313 25, 313113, F21V 709
Patent
active
052531538
ABSTRACT:
This headlamp comprises a reflector and a discharge lamp comprising an inner envelope having a longitudinal axis coinciding with the optical axis of the reflector. The inner envelope includes a bulbous portion, a front leg extending along the optical axis from the bulbous portion toward the front of the headlamp, and a back leg extending along the optical axis from the bulbous portion toward the reflector. The discharge lamp further comprises a tubular shroud comprising a first hollow portion surrounding the front leg of the inner envelope, a second hollow portion surrounding the back leg of the inner envelope, and a bulbous portion between the two hollow portions. The front leg is provided with a large-diameter integral enlargement (referred to herein as a "large-diameter maria"), and the shroud is joined to the front leg by a maria seal located at the outer periphery of this maria. The shroud is joined to the back leg of the inner envelope by a low-profile seal of substantially smaller diameter than the large-diameter maria seal located much closer to the longitudinal axis of the inner envelope than is the large-diameter maria seal.
The bulbous portion of the shroud has (i) a back zone facing the reflector of generally ellipsoidal configuration and (ii) a central axis upwardly offset by a small distance from the longitudinal axis of the inner envelope. This offset has been found to substantially increase the ratio of the seeing light to the glare light in the headlamp beam.
REFERENCES:
patent: 2272467 (1942-02-01), Kern et al.
patent: 4800467 (1989-01-01), Lindae et al.
patent: 4864180 (1989-09-01), English et al.
patent: 4935668 (1990-06-01), Hansler et al.
patent: 4949003 (1990-08-01), Cox et al.
patent: 5106150 (1991-05-01), Gordin et al.
Allen Gary R.
Mathews Paul G.
Cariaso Alan B.
Corcoran Edward M.
Corwin Stanley C.
General Electric Company
Makay Albert J.
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