US4670823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle lamp having inner lens
Assignee: Stanley Electric Co Ltd
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Filing: 1984-12-31
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Granted: 1987-06-02
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Expires: 2004-12-31
Abstract
Abstract This invention provides a vehicle lamp wherein an inner lens made of a heat-resistant resin film and having a Fresnel cut pattern is mounted in tight contact with an inner surface of an outer lens mounted on a front surface of the vehicle lamp.
Inventors
- 👤 Takeshi Kochi
- 👤 Akihiro Iwaki
- 👤 Masayoshi Tajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:30
CPC Classifications
F; F21; F21S; F21S43/00; F21S43/20; F21S43/26; F21S45/00; F21S45/40; F21S43/40; F21S45/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A vehicle lamp comprising an inner lens made of heat-resistant resin film and having a Fresnel cut pattern mounted in tight contact with an inner surface of an outer lens having a convex cut mounted on a front surface of said vehicle lamp wherein said inner lens provides substantially parallel beams of light and said outer lens diverges said beams of light, and said convex cut comprising a plurality of intersecting arcs as viewed in cross section, each said arc having a substantially equal radius of curvature, a point of intersection between sach said arc defining a respective end point of a respective chord, each said chord having a length much greater than a pitch of said Fresnel cut pattern.
Claim 2
Dependent Claim
120 words
A vehicle lamp comprising an inner lens made of heat-resistant resin film and having a Fresnel cut pattern mounted in tight contact with an inner surface of an outer lens having a convex cut mounted on a front surface of said vehicle lamp wherein said inner lens provides substantially parallel beams of light and said outer lens diverges said beams of light, and said convex cut comprising a plurality of intersecting arcs as viewed in cross section, each said arc having a substantially equal radius of curvature, a point of intersection between sach said arc defining a respective end point of a respective chord, each said chord having a length much greater than a pitch of said Fresnel cut pattern.
Claim 3
Dependent Claim
21 words
A vehicle lamp according to claim 1, wherein said heat-resistant resin film has a basic thickness of 0.3 to 1.0 mm.
Claim 4
Dependent Claim
15 words
A vehicle lamp according to claim 1, wherein said heat-resistant resin film comprises polycarbonate resin.
Claim 5
Dependent Claim
21 words
A vehicle lamp according to claim 1, wherein said Fresnel cut pattern has a pitch of not more than 0.3 mm.
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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |