US4566056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headlamp for vehicle
Assignee: Stanley Electric Co Ltd
•
Filing: 1984-03-08
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Granted: 1986-01-21
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Expires: 2004-03-08
Abstract
Abstract The present invention discloses a headlamp for a vehicle of a construction in which two paraboloidal surfaces of a reflector are different at upper surface and lower surface thereof as viewed from a line corresponding to a predetermined boundary line, a focal point on the upper surface side is positioned ahead of a focal point on the lower surface side, and approximately the center of the main filament is arranged to be positioned at the focal point of the lower surface side.
Inventors
- 👤 Tadashi Kouchi
- 👤 Yoshiharu Urakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:38
CPC Classifications
F; F21; F21S; F21S41/00; F21S41/30; F21S41/32; F21S41/33; F21S41/334; F21S41/336; F21S41/10; F21S41/14; F21S41/162; F21S41/164
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
A headlamp for a vehicle comprising: a reflector having a main filament and a sub-filament disposed on the same axis; said reflector having a first paraboloidal surface having a first focal distance and a second paraboloidal surface having a second focal distance; said reflector having first and second focal points disposed on the same longitudinal axis and defined by said first and second focal distances; said reflector having a space of 0.5 to 4 mm between said first and second focal points; and said second focal point being located at the same location as said main filament.
Claim 2
Dependent Claim
97 words
A headlamp for a vehicle comprising: a reflector having a main filament and a sub-filament disposed on the same axis; said reflector having a first paraboloidal surface having a first focal distance and a second paraboloidal surface having a second focal distance; said reflector having first and second focal points disposed on the same longitudinal axis and defined by said first and second focal distances; said reflector having a space of 0.5 to 4 mm between said first and second focal points; and said second focal point being located at the same location as said main filament.
Claim 3
Dependent Claim
62 words
A headlamp for a vehicle according to claim 1 wherein the headlamp has a construction in which approximately the center of the main filament is positioned at the focal point of the paraboloidal surface on the lower surface side of the reflector whereby a spot pattern of a main beam is smallest in angle of diffusion to increase the luminous flux density.
Claim 4
Dependent Claim
51 words
A headlamp for a vehicle according to claim 1 wherein the filaments are arranged so that the main filament and sub-filament are in a suitable positional relation with two focal points whereby even if slight unevenness is present in position of the filaments or reflector, the out of focus rarely occurs.
Claim 5
Dependent Claim
29 words
A headlamp for a vehicle according to claim 1 wherein the headlamp can be also constructed such that a bulb in place of filaments is mounted within the relfector.
References Cited (Backward Citations)
US3688149A
Cited
US3871751A
Cited
US4149229A
Cited
US4351018A
Cited
US4420801A
Cited
US4447865A
Cited
US4494176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |