US3825742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp unit with controlled-diffusion reflector and method of making the reflector
Assignee: GTE Sylvania Inc
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Filing: 1973-01-02
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Granted: 1974-07-23
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Expires: 1993-01-02
Abstract
Abstract For a lamp unit, a sagged glass reflector having a stippled, concave surface for providing controlled diffusion of light. The method of making the reflector comprises: providing a preheated concave mold having a uniform pattern of peened indentations in its surface and a plurality of vacuum drawing holes; placing a flat blank of glass across the opening of the mold; heating the glass to a plastic state; drawing a partial vacuum in the mold to force the plasticized glass to sag against the peened surface of the mold; cooling the glass to a rigid state; and applying a coating of reflective material on the concave surface of the sagmolded glass.
Inventors
- 👤 R Levin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:38
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/035; C03B23/0352; C03B23/0357; F; F21; F21V; F21V7/00; F21V7/10; F21V7/22; F21V7/24; F21V7/28; G; G02; G02B; G02B5/00; G02B5/08; G02B5/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
A reflector for providing controlled diffusion of light comprising, a piece of material sagged to have a concave surface with a stippled effect over a substantial portion thereof, said sagged material thereby having a concave surface on one side thereof with a plurality of indentations therein comprising said stippled effect and a convex surface on the opposite side thereof with a plurality of protuberances thereon respectively corresponding to said indentations, the curvature of each protuberance being greater than the curvature of the indentation corresponding thereto, and a coating of reflective material on said concave surface.
Claim 2
Dependent Claim
95 words
A reflector for providing controlled diffusion of light comprising, a piece of material sagged to have a concave surface with a stippled effect over a substantial portion thereof, said sagged material thereby having a concave surface on one side thereof with a plurality of indentations therein comprising said stippled effect and a convex surface on the opposite side thereof with a plurality of protuberances thereon respectively corresponding to said indentations, the curvature of each protuberance being greater than the curvature of the indentation corresponding thereto, and a coating of reflective material on said concave surface.
Claim 3
Dependent Claim
24 words
A reflector according to claim 1 wherein said stippled effect is disposed in a ordered pattern over a substantial portion of said sagged material.
Claim 4
Dependent Claim
53 words
A reflector according to claim 2 wherein said stippled effect comprises a substantially uniform pattern of concave spherical indentations in the concave surface of said sagged material, and said plurality of protuberances comprise a substantially uniform pattern of convexities on the convex surface of said sagged material which respectively correspond to said indentations.
Claim 5
Dependent Claim
11 words
A reflector accordin to claim 1 wherein said material is glass.
Claim 6
Dependent Claim
22 words
A reflector according to claim 4 wherein the maximum thickness of said piece of sagged glass is less than about 0.1 inch.
Claim 7
Dependent Claim
36 words
A reflector according to claim 5 wherein said piece of sagged glass has a mean coefficient of thermal expansion about in the rang of 87 to 93 X 10 7 per *C between 0* and 300*C.
Claim 8
Dependent Claim
132 words
A lamp unit for producing a beam of light with controlled diffusion comprising, a concave reflector having a stippled effect thereon, and a light source supported within or in immediate proximity to the volume defined by said reflector and the aperture plane thereof, said reflector comprising a piece of material sagged to haVe a concave surface with a stippled effect over a substantial portion thereof, said sagged material thereby having a concave surface on one side thereof with a plurality of indentations therein comprising said stippled effect and a convex surface on the opposite side thereof with a plurality of protuberances thereon respectively corresponding to said indentations, the curvature of each protuberance being greater than the curvature of the indentation corresponding thereto, and a coating of reflective material on said concave surface.
Claim 9
Dependent Claim
132 words
A lamp unit for producing a beam of light with controlled diffusion comprising, a concave reflector having a stippled effect thereon, and a light source supported within or in immediate proximity to the volume defined by said reflector and the aperture plane thereof, said reflector comprising a piece of material sagged to haVe a concave surface with a stippled effect over a substantial portion thereof, said sagged material thereby having a concave surface on one side thereof with a plurality of indentations therein comprising said stippled effect and a convex surface on the opposite side thereof with a plurality of protuberances thereon respectively corresponding to said indentations, the curvature of each protuberance being greater than the curvature of the indentation corresponding thereto, and a coating of reflective material on said concave surface.
Claim 10
Dependent Claim
24 words
The lamp unit of claim 7 wherein said sagged material is glass, said reflector is ellipsoidal, and said light source is an incandescent filament.
Claim 11
Dependent Claim
25 words
The lamp unit according to claim 8 wherein said stippled effect is disposed in a ordered pattern over a substantial portion of said sagged glass.
Claim 12
Dependent Claim
54 words
A lamp unit according to claim 9 wherein said stippled effect comprises a substantially uniform pattern of concave spherical indentations in the concave surface of said sagged glass, and said plurality of protuberances comprise a substantially uniform pattern of convexities on the convex surface of said sagged glass which respectively correspond to said indentations.
Claim 13
Dependent Claim
47 words
A lamp unit according to claim 8 wherein said piece of sagged glass has a maximum thickness of less than about 0.1 inch and a mean coefficient of thermal expansion about in the range of 87 to 93 X 10 7 per *C between 0* and 300*C.
Claim 14
Dependent Claim
40 words
A lamp unit according to claim 8 wherein said coating of reflective material is a cold dichroic mirror coating for reflecting visible light from said incandescent filament but passing a substantial portion of the infrared radiation therefrom through said reflector.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |