Patent US4769748A successfully refreshed from Google Patents.
US4769748A
Expired / Lapsed
US
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Lamp reflector
Assignee: Osram Sylvania Inc
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Filing: 1987-10-01
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Granted: 1988-09-06
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Expires: 2007-10-01
Abstract
Abstract A lamp combination wherein the reflector's reflective surface is of a shape specifically designed to compensate for the refractive effects produced by the thickness of the glass walls of the light source's envelope structure located within (surrounded by) the reflector. Optimum light output is thus assured. A method of making such a lamp is also disclosed.
Inventors
- 👤 Robert E. Levin
- 👤 George J. English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:31
CPC Classifications
F; F21; F21S; F21S41/00; F21S41/30; F21S41/32; F21S41/323; F21S41/33; F21S41/338
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
A lamp comprising: a source of light enclosed in a transparent, walled envelope having a wall thickness T and an index of refraction n; and a reflector having an axis and only a singular reflective surface possessing a predetermined curved shape for reflecting light from said light source located within said reflector at the focal point thereof and substantially surrounded by said singular reflective surface wherein said curved shape of said singular reflective surface is calculated to compensate for the light ray refraction caused by said walled envelope as said light from said source of light passes therethrough to thereby provide optimum light output from said lamp, said light ray refraction compensation being provided by said singular reflective surface of said reflector and not by the utilization of open spaces or the like therein, said envelope having said light source enclosed therein being oriented along said axis of said reflector.
Claim 2
Dependent Claim
150 words
A lamp comprising: a source of light enclosed in a transparent, walled envelope having a wall thickness T and an index of refraction n; and a reflector having an axis and only a singular reflective surface possessing a predetermined curved shape for reflecting light from said light source located within said reflector at the focal point thereof and substantially surrounded by said singular reflective surface wherein said curved shape of said singular reflective surface is calculated to compensate for the light ray refraction caused by said walled envelope as said light from said source of light passes therethrough to thereby provide optimum light output from said lamp, said light ray refraction compensation being provided by said singular reflective surface of said reflector and not by the utilization of open spaces or the like therein, said envelope having said light source enclosed therein being oriented along said axis of said reflector.
Claim 3
Dependent Claim
170 words
A lamp comprising: a source of light enclosed in a transparent walled envelope having a wall thickness T and index of refraction n; and a reflector having an axis and only a singular reflecting surface and conjugate focal points with respect thereto, said singular reflecting surface possessing a predetermined curved reflective shape for concentrating light from said light source when said source is located at a first of said focal points to said conjugate focal point and substantially surrounded by said singular reflective surface, wherein said curved reflective shape of said singular reflective surface is calculated to compensate for the light ray refraction caused by said walled envelope as said light from said filament passes through said envelope to thereby provide optimum light output from said lamp, said light ray refraction compensation being provided by said singular reflective surface of said reflector and not by the utilization of open spaces or the like therein, said envelope having said light source enclosed therein being oriented along said axis of said reflector.
Claim 4
Dependent Claim
170 words
A lamp comprising: a source of light enclosed in a transparent walled envelope having a wall thickness T and index of refraction n; and a reflector having an axis and only a singular reflecting surface and conjugate focal points with respect thereto, said singular reflecting surface possessing a predetermined curved reflective shape for concentrating light from said light source when said source is located at a first of said focal points to said conjugate focal point and substantially surrounded by said singular reflective surface, wherein said curved reflective shape of said singular reflective surface is calculated to compensate for the light ray refraction caused by said walled envelope as said light from said filament passes through said envelope to thereby provide optimum light output from said lamp, said light ray refraction compensation being provided by said singular reflective surface of said reflector and not by the utilization of open spaces or the like therein, said envelope having said light source enclosed therein being oriented along said axis of said reflector.
References Cited (Backward Citations)
US1618010A
Cited
US1775619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |