US4225903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor vehicle headlight for low and high beams
Assignee: Bayerische Motoren Werke AG
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Filing: 1978-05-10
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Granted: 1980-09-30
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Expires: 1998-05-10
Abstract
Abstract A motor vehicle headlight with a reflector consisting of two partial paraboloids arranged one above the other, which have at least approximately a common axis and of which the focus of the upper partial paraboloid is located closer to the apeces of the two partial paraboloids; a first filament for the low beam is located between the two foci of the two partial paraboloids while a second filament for the high beam is located in the focus of the lower partial paraboloid; the light emitted by the high-beam filament in the direction toward the upper partial paraboloid is shielded by a covering arranged on top of the high beam filament.
Inventors
- 👤 Konrad Buchleitner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:30
CPC Classifications
F; F21; F21S; F21S41/00; F21S41/60; F21S41/65; F21S41/663; F21S41/10; F21S41/14; F21S41/162; F21S41/164; F21S41/30; F21S41/32; F21S41/36; F21S41/40; F21S41/43; F21S41/435
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
116 words
A motor vehicle headlight, comprising a reflector means including two partial paraboloids arranged one above the other, the focus of the upper partial paraboloid being located closer to the apeces of the two partial paraboloids, a first filament means for producing a low beam, said first filament means being located between the two foci of the two partial paraboloids, and a second filament means for producing a high beam, said second filament means being located substantially within the focus of the lower partial paraboloid, characterized by a covering means for shielding the light emitted by the second filament means in the direction toward the upper partial paraboloid whereby near-field illumination by the high beam is avoided.
Claim 2
Dependent Claim
116 words
A motor vehicle headlight, comprising a reflector means including two partial paraboloids arranged one above the other, the focus of the upper partial paraboloid being located closer to the apeces of the two partial paraboloids, a first filament means for producing a low beam, said first filament means being located between the two foci of the two partial paraboloids, and a second filament means for producing a high beam, said second filament means being located substantially within the focus of the lower partial paraboloid, characterized by a covering means for shielding the light emitted by the second filament means in the direction toward the upper partial paraboloid whereby near-field illumination by the high beam is avoided.
Claim 3
Dependent Claim
20 words
A headlight according to claim 1, characterized in that the two partial paraboloids have at least approximately a common axis.
Claim 4
Dependent Claim
36 words
A headlight according to claim 1 or 2, characterized in that at least a portion of the covering means is arranged together with the filament means for low beam and high beam within an incandescent lamp.
Claim 5
Dependent Claim
19 words
A headlight according to claim 3, characterized in that said part of the covering means is an antidazzle shield.
Claim 6
Dependent Claim
43 words
A headlight according to claim 3, characterized in that the incandescent lamp is a commercial two-filament incandescent lamp with a covering means for one filament means, said last-mentioned filament means producing the high beam and the other filament means producing the low beam.
Claim 7
Dependent Claim
42 words
A headlight according to claim 5, characterized in that an additional shielding means outside of the incandescent lamp together with the portion of the light covering means facing the upper partial paraboloid form the covering means for the high beam filament means.
Claim 8
Dependent Claim
46 words
A headlight according to claim 6, with a cover cap in front of the incandescent lamp for light emitted directly by the filament means onto a light exit lens, characterized in that the additional shielding means is secured at a mounting means of the cover cap.
Claim 9
Dependent Claim
25 words
A headlight according to claim 7, characterized in that the additional shielding means, the cover cap and the mounting means are made in one piece.
Claim 10
Dependent Claim
43 words
A headlight according to claim 1, characterized in that the incandescent lamp is a commercial two-filament incandescent lamp with a covering means for one filament means, said last-mentioned filament means producing the high beam and the other filament means producing the low beam.
Claim 11
Dependent Claim
42 words
A headlight according to claim 9, characterized in that an additional shielding means outside of the incandescent lamp together with the portion of the light covering means facing the upper partial paraboloid form the covering means for the high beam filament means.
Claim 12
Dependent Claim
46 words
A headlight according to claim 10, with a cover cap in front of the incandescent lamp for light emitted directly by the filament means onto a light exit lens, characterized in that the additional shielding means is secured at a mounting means of the cover cap.
Claim 13
Dependent Claim
25 words
A headlight according to claim 11, characterized in that the additional shielding means, the cover cap and the mounting means are made in one piece.
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) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |