US4308574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automobile headlight with reduced heating of the cover glass
Assignee: Cibie Projecteurs
•
Filing: 1978-12-08
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Granted: 1981-12-29
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Expires: 1998-12-08
Abstract
Abstract The invention relates to an automobile headlight comprising a light source, a reflector and a cover glass, wherein zones of the reflector giving rise to a concentration of the rays reflected on the cover glass are concealed, thus minimizing the heating of the glass, without substantially disturbing the luminous efficacy.
Inventors
- 👤 Hector Fratty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:26
CPC Classifications
F; F21; F21S; F21S41/00; F21S41/40; F21S41/43
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
An automobile headlight comprising: (a) a reflector having a rear central opening and a focus in front of that opening; (b) a transparent cover closing the front of the reflector; (c) a light source located in front of the reflector focus so that the rays from the light source which are reflected by the reflector tend to converge toward the cover, thereby heating the cover, and the headlight having a cut-off plane for providing a dipped beam; and (d) the reflector having a region which does not reflect direct rays from the light source toward the cover, said region being adjacent to and radially outward of the rear central opening of the reflector, and said reflector region stopping short of preventing reflection of dipped beam rays from the reflector in the vicinity of the cut-off plane; whereby the heating effect of the reflected rays on the cover is reduced.
Claim 2
Dependent Claim
149 words
An automobile headlight comprising: (a) a reflector having a rear central opening and a focus in front of that opening; (b) a transparent cover closing the front of the reflector; (c) a light source located in front of the reflector focus so that the rays from the light source which are reflected by the reflector tend to converge toward the cover, thereby heating the cover, and the headlight having a cut-off plane for providing a dipped beam; and (d) the reflector having a region which does not reflect direct rays from the light source toward the cover, said region being adjacent to and radially outward of the rear central opening of the reflector, and said reflector region stopping short of preventing reflection of dipped beam rays from the reflector in the vicinity of the cut-off plane; whereby the heating effect of the reflected rays on the cover is reduced.
Claim 3
Dependent Claim
23 words
An automobile headlight as defined in claim 1 wherein said reflector region has an arcuate shape at least partially surrounding the reflector opening.
Claim 4
Dependent Claim
14 words
An automobile headlight as defined in claim 1 wherein said reflector region is non-reflecting.
Claim 5
Dependent Claim
16 words
An automobile headlight as defined in claim 1 wherein said reflector region carries a black coating.
Claim 6
Dependent Claim
24 words
An automobile headlight as defined in claim 1 including a screen for preventing direct rays from the light source from reaching said reflector region.
Claim 7
Dependent Claim
39 words
An automobile headlight as defined in claim 5 wherein the screen is metallic and includes a portion extending externally of the reflector, for conducting heat, generated by the rays from the light source, to the exterior of the headlight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |