Patent US4654758A successfully refreshed from Google Patents.
US4654758A
Expired / Lapsed
US
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Headlamp
Assignee: Tungsram Rt
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Filing: 1985-09-06
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Granted: 1987-03-31
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Expires: 2005-09-06
Abstract
Abstract The invention concerns a headlamp, the envelope of which is constituted internally by at least one concave reflecting surface, preferably by paraboloid-shape and spherical surfaces, and having a light-emitting element in, or near, the focus of the main reflecting surface and mounted on the current conducting support, and the envelope being shut-up by a transparent cover plate. The essence of the invention consists of having a convex mirror located between the light-emitting element and the cover plate, with its reflecting surface facing the light-emitting element and the concave reflecting surfaces. The surface of the convex mirror is preferably of the shape of a hyperboloid of rotation.
Inventors
- 👤 Gyorgy Szekacs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:15
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/04; F21V7/09; F21S; F21S41/00; F21S41/10; F21S41/14; F21S41/162; F21S41/30; F21S41/32; F21S41/321; F21S41/33; F21S41/331; F21S41/333; F21S41/36; F21S41/365
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A headlamp comprising an envelope constituted internally by a paraboloid of rotation and spherical shaped concave reflecting surfaces, a light emitting element arranged substantially in the focal point of a paraboloid shaped main reflecting surface and mounted on current conducting supports, and a transparent cover plate closing said envelope, wherein a convex mirror is located between said light emitting element and said cover plate and arranged with its reflecting surface facing said light emitting element and said concave reflecting surfaces, the length of the diameter of said convex mirror being equal to or differing by not more than by ±1/8 of the length of the diameter of the of the smaller aperture of said main reflecting surface from said diagonal straight lines drawn between the junction circle between the main reflecting surface and the cover plate, and the focal point of the main reflecting surface.
Claim 2
Dependent Claim
145 words
A headlamp comprising an envelope constituted internally by a paraboloid of rotation and spherical shaped concave reflecting surfaces, a light emitting element arranged substantially in the focal point of a paraboloid shaped main reflecting surface and mounted on current conducting supports, and a transparent cover plate closing said envelope, wherein a convex mirror is located between said light emitting element and said cover plate and arranged with its reflecting surface facing said light emitting element and said concave reflecting surfaces, the length of the diameter of said convex mirror being equal to or differing by not more than by ±1/8 of the length of the diameter of the of the smaller aperture of said main reflecting surface from said diagonal straight lines drawn between the junction circle between the main reflecting surface and the cover plate, and the focal point of the main reflecting surface.
References Cited (Backward Citations)
FR1058232A
Cited
FR1321999A
Cited
DE1167773B
Cited
US3494693A
Cited
US4420801A
Cited
US4420800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-30 | 1990-09-29 | 1991-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-30 | 1994-09-29 | 1995-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-30 | 1998-09-29 | 1999-03-31 | $7700.00 | Window Closed / Lapsed |