Patent US4918580A successfully refreshed from Google Patents.
US4918580A
Expired / Lapsed
US
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Vehicle headlamp
Assignee: Koito Manufacturing Co Ltd
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Filing: 1988-11-04
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Granted: 1990-04-17
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Expires: 2008-11-04
Abstract
Abstract Herein disclosed is a vehicle headlamp which comprises a compound light reflector including a plurality of concave light reflecting surfaces which are arranged to have a first common focus, either one of a second common focus and a second common focal line, and a common optical axis, each light reflecting surface being so shaped as to provide an elliptical line when cut by a vertical plane; a light source located on the first common focus of the compound light reflector; a shade plate positioned in front of the compound light reflector, the shade plate having an upper edge located in the vicinity of one of the second common focus and the second common focal line; and a converging lens located in front of the shade plate in such a manner that a focus of the lens is positioned on the upper edge of the shade plate.
Inventors
- 👤 Naohi Nino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:52
CPC Classifications
F; F21; F21S; F21S41/00; F21S41/40; F21S41/43; F21S41/30; F21S41/32; F21S41/33; F21S41/10; F21S41/14; F21S41/162; F21S41/20; F21S41/25; F21S41/331; F21S41/333; F21S41/334; F21S41/336
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
210 words
A vehicle headlamp comprising: a compound light reflector including a plurality of concave light reflecting surfaces which are arranged to have a first common focus, either one of a second common focus and a second common focal line, and a common optical axis, each light reflecting surface being so shaped as to provide an elliptical line when cut by a vertical plane, at least one of said light reflecting surfaces being so shaped as to provide a parabolic line when cut by a horizontal plane; a light source located on said first common focus of said compound light reflector; a shade plate positioned in front of said compound light reflector, said shade plate having an upper edge located in the vicinity of one of said second common focus and said second common focal line; and a converging lens located in front of said shade plate in such a manner that a focus of the lens is positioned on said upper edge of said shade plate, wherein light rays produced by said light source are reflected by the respective light reflecting surfaces to produce respective light beams which are permitted to project forward through said lens, said respective light beams having contoured cross-sectional pattern zones which are different in lateral length.
Claim 2
Dependent Claim
210 words
A vehicle headlamp comprising: a compound light reflector including a plurality of concave light reflecting surfaces which are arranged to have a first common focus, either one of a second common focus and a second common focal line, and a common optical axis, each light reflecting surface being so shaped as to provide an elliptical line when cut by a vertical plane, at least one of said light reflecting surfaces being so shaped as to provide a parabolic line when cut by a horizontal plane; a light source located on said first common focus of said compound light reflector; a shade plate positioned in front of said compound light reflector, said shade plate having an upper edge located in the vicinity of one of said second common focus and said second common focal line; and a converging lens located in front of said shade plate in such a manner that a focus of the lens is positioned on said upper edge of said shade plate, wherein light rays produced by said light source are reflected by the respective light reflecting surfaces to produce respective light beams which are permitted to project forward through said lens, said respective light beams having contoured cross-sectional pattern zones which are different in lateral length.
Claim 3
Dependent Claim
70 words
A vehicle headlamp as claimed in claim 1, in which said concave light reflecting surfaces comprise upper and lower light reflecting surfaces which are located at upper and lower portions with respect to a horizontal plane which includes said common optical axis, and in which at least one of said light reflecting surfaces is further so shaped as to provide a parabolic cut line when cut by a horizontal plane.
Claim 4
Dependent Claim
38 words
A vehicle headlamp as claimed in claim 2, in which said upper and lower light reflecting surfaces are formed respectively on two reflectors which are respectively arranged at upper and lower portions with respect to said horizontal plane.
Claim 5
Dependent Claim
29 words
A vehicle headlamp as claimed in claim 3, in which the focal distance of said upper light reflecting surface is smaller than that of said lower light reflecting surface.
Claim 6
Dependent Claim
31 words
A vehicle headlamp as claimed in claim 4, in which said focus of said converging lens is positioned on a laterally middle part of said upper edge of said shade plate.
Claim 7
Dependent Claim
23 words
A vehicle headlamp as claimed in claim 5, in which said shade plate extends in a direction perpendicular to said common optical axis.
Claim 8
Dependent Claim
34 words
A vehicle headlamp as claimed in claim 6, in which said shade plate is arranged below said common optical axis having the upper edge thereof placed in the vicinity of said common optical axis.
Claim 9
Dependent Claim
30 words
A vehicle headlamp as claimed in claim 2, in which said upper and lower light reflecting surfaces are formed on respective reflectors which are combined to form a single unit.
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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) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |