US4577260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle lamp assemblies
Assignee: Koito Europe Ltd
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Filing: 1984-10-12
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Granted: 1986-03-18
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Expires: 2004-10-12
Abstract
Abstract A vehicle lamp assembly is disclosed for use when the outer cover or lens element extends round the corner of the vehicle or when the outer cover or lens element is significantly larger in one or two mutually perpendicular directions than in the other. The lamp assembly comprises a light source, a light transmitting cover element and a light transmitting intermediate element disposed between the source and the cover element. The intermediate element has coaxial cylindrical inner and outer surfaces located with the light source of their common axis, one of the cylindrical surfaces carrying elongated Fresnel prism formations of uniform cross-section extending parallel to the common axis and the other cylindrical surface carrying elongate Fresnel prism formations of constant cross-section extending in respective planes perpendicular to said common axis.
Inventors
- 👤 Nicholas W. Tysoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:10
CPC Classifications
F; F21; F21S; F21S43/00; F21S43/20; F21S43/2605; F21S43/2621; F21S43/255; F21S43/26; F21S43/40; F21V; F21V5/00; F21V5/008; F21V5/04; F21V5/045; F21V7/00; F21V7/04; F21V7/08; F21W; F21W2107/00; F21W2107/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
A vehicle lamp assembly having an optical axis and comprising a light source, a light transmitting cover element which is unsymmetrical with respect said optical axis, a light transmitting intermediate element disposed between the source and the cover element and comprising generally cylindrical inner and outer surfaces having their axes coincident with each other, perpendicular to said optical axis and located with the light source at the intersection of said optical axis and said coincident axes, one of said cylindrical surfaces carrying elongate Fresnel prism formations of uniform cross-section extending in respective planes parallel to said coincident axes and the other cylindrical surface carrying elongate Fresnel prism formations of constant cross-section extending in respective planes perpendicular to said coincident axes, so as to direct collimated light from the source parallel to said optical axis and on to substantially the whole of the cover element.
Claim 2
Dependent Claim
144 words
A vehicle lamp assembly having an optical axis and comprising a light source, a light transmitting cover element which is unsymmetrical with respect said optical axis, a light transmitting intermediate element disposed between the source and the cover element and comprising generally cylindrical inner and outer surfaces having their axes coincident with each other, perpendicular to said optical axis and located with the light source at the intersection of said optical axis and said coincident axes, one of said cylindrical surfaces carrying elongate Fresnel prism formations of uniform cross-section extending in respective planes parallel to said coincident axes and the other cylindrical surface carrying elongate Fresnel prism formations of constant cross-section extending in respective planes perpendicular to said coincident axes, so as to direct collimated light from the source parallel to said optical axis and on to substantially the whole of the cover element.
Claim 3
Dependent Claim
34 words
A lamp assembly according to claim 1, wherein the prism formations on the outer surface of the intermediate element are parallel to the coincident axes while those on the inner surface are perpendicular thereto.
Claim 4
Dependent Claim
45 words
A lamp assembly according to claim 1, wherein one edge of the cover element lies in a plane perpendicular to the optical axis which is closer to the light source than the distance along the optical axis between the intermediate element and the light source.
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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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |