US3707626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical reflector
Assignee: Individual
•
Filing: 1971-04-08
•
Granted: 1972-12-26
•
Expires: 1991-04-08
Abstract
Abstract An optical reflector suitable for use in spotlights for projectors to direct light from a source through a gate to a lens system forming an objective. The reflector is so shaped that a substantial even field of illumination is obtained at the gate.
Inventors
- 👤 Robert John Delchen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:06
CPC Classifications
F; F21; F21V; F21V11/00; F21V11/08; F21V7/00; F21V7/04; F21V7/08; F21W; F21W2131/00; F21W2131/40; F21W2131/406
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
184 words
An optical system comprising a gate, an optical reflector and a light source positioned on the line joining the centers of the gate and the reflector; the reflector being so shaped that a ray of light from a point source located at the said position would pass through the gate, following reflection at any point of the reflector, at a distance Y from the center of the gate where Y Ymax square root (1 - cos W)/(1 - cos Wmax) and Ymax is the radius of the gate; W is the angle made by the said ray of light as it travels from said source to said one point on said reflector with that portion of said line joining the source and the center of the reflector, and Wmax is the corresponding angle between said line portion and a ray of light as it travels from said source to a point on the edge of the reflector from which it passes through the gate at a distance Ymax from the center thereof, whereby a substantially even fIeld of illumination is obtained at the gate.
Claim 2
Dependent Claim
184 words
An optical system comprising a gate, an optical reflector and a light source positioned on the line joining the centers of the gate and the reflector; the reflector being so shaped that a ray of light from a point source located at the said position would pass through the gate, following reflection at any point of the reflector, at a distance Y from the center of the gate where Y Ymax square root (1 - cos W)/(1 - cos Wmax) and Ymax is the radius of the gate; W is the angle made by the said ray of light as it travels from said source to said one point on said reflector with that portion of said line joining the source and the center of the reflector, and Wmax is the corresponding angle between said line portion and a ray of light as it travels from said source to a point on the edge of the reflector from which it passes through the gate at a distance Ymax from the center thereof, whereby a substantially even fIeld of illumination is obtained at the gate.
Claim 3
Dependent Claim
28 words
An optical system according to claim 1, in which a beam of light from the said light source is convergent at the gate following reflection by the reflector.
References Cited (Backward Citations)
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US2183249A
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US2894428A
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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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |