US4800467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimmed headlight, particularly for motor vehicles
Assignee: Robert Bosch GmbH
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Filing: 1987-06-04
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Granted: 1989-01-24
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Expires: 2007-06-04
Abstract
Abstract A dimmed headlight for a motor vehicle has a vertical center section defining an ellipse whose outer portion transits into an apex portion. The apex portion defines an inner focal point and an outer focal point and the upper elliptical portion defines a focal point coinciding with said inner focal point and a plurality of outer focal points located on the long axis of the ellipse behind the outer focal point of the apex portion when viewed in the direct of reflected light rays. An objective is arranged before the last one of the outer focal points to collect the reflected light rays. The lower part of the reflector contains a light reflecting member and a diaphragm extending transversely to the long axis in the outer focal point of the apex portion. The light reflecting member is oriented such as to reflect downwardly directed light rays from the light source against an upper part of the apex portion. In this manner, light intensity of reflected beam is increased and an improved illumination of the driveway before the vehicle is obtained.
Inventors
- 👤 Gerhard Lindae
- 👤 Richard Loewe
- 👤 Peter Perthus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:40
CPC Classifications
F; F21; F21S; F21S41/00; F21S41/40; F21S41/43; F21S41/10; F21S41/14; F21S41/30; F21S41/32; F21S41/36; F21S41/365
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
244 words
A dimmed headlight for motor vehicles, comprising a reflector whose vertical center section delimits a partial ellipse having an apex portion defining an optical axis, an inner focal point and an outer focal point located in said optical axis, said apex portion transiting into an upper elliptical portion and a lower elliptical portion, said upper and lower elliptical portions having an inner focal point coinciding with said inner focal point of the apex portion, said upper elliptical portion being shaped such as to provide a plurality of outer focal points located on said optical axis behind said outer focal point of the apex portion when viewed in the direction of reflected light rays; a light source arranged in the region of said inner focal points; an objective arranged on said optical axis between said outer focal point of the apex portion and an outermost focal point of the upper elliptical portion to collect light rays reflected by said apex portion and the said upper elliptical portion; a diaphragm provided in a lower part of said reflector in the region below said outer focal point of the apex portion and extending transversely to said optical axis to block-off light rays propagating in said lower part of the reflector; and a light reflecting member provided within said lower part of the reflector before said diaphragm to reflect downwardly directed rays from said light source against a part of said apex portion situated above said optical axis.
Claim 2
Dependent Claim
244 words
A dimmed headlight for motor vehicles, comprising a reflector whose vertical center section delimits a partial ellipse having an apex portion defining an optical axis, an inner focal point and an outer focal point located in said optical axis, said apex portion transiting into an upper elliptical portion and a lower elliptical portion, said upper and lower elliptical portions having an inner focal point coinciding with said inner focal point of the apex portion, said upper elliptical portion being shaped such as to provide a plurality of outer focal points located on said optical axis behind said outer focal point of the apex portion when viewed in the direction of reflected light rays; a light source arranged in the region of said inner focal points; an objective arranged on said optical axis between said outer focal point of the apex portion and an outermost focal point of the upper elliptical portion to collect light rays reflected by said apex portion and the said upper elliptical portion; a diaphragm provided in a lower part of said reflector in the region below said outer focal point of the apex portion and extending transversely to said optical axis to block-off light rays propagating in said lower part of the reflector; and a light reflecting member provided within said lower part of the reflector before said diaphragm to reflect downwardly directed rays from said light source against a part of said apex portion situated above said optical axis.
Claim 3
Dependent Claim
93 words
A headlight as defined in claim 1, wherein said light source is an incandescent lamp having a spiral filament coaxial with said optical axis, said light reflecting member consisting of two sphere segments, one sphere segment being arranged to the left and the other sphere segment to the right with respect to a vertical center plane of the reflector, the left side sphere segment having a center point located to the left of said spiral filament, and the right side sphere segment having a center point located to the right of said filament.
Claim 4
Dependent Claim
38 words
A headlight as defined in claim 2, wherein said sphere segments generate images of said spiral filament, one of said images being located to the left and to the other to the right of the respective center points
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) | 1992-01-24 | 1992-07-25 | 1993-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-24 | 1996-07-25 | 1997-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-24 | 2000-07-25 | 2001-01-24 | $7700.00 | Window Closed / Lapsed |