US5008781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headlamp unit
Assignee: Koito Manufacturing Co Ltd
•
Filing: 1989-11-08
•
Granted: 1991-04-16
•
Expires: 2009-11-08
Abstract
Abstract Disclosued herein is a headlamp unit. The unit comprises a multi-surface concave reflector having a beam axis along which a light beam projects forward to produce a beam pattern, the reflector including upper and lower concave light reflecting parts which are respectively located at upper and lower positions with respect to a given portion of the reflector, and left and right concave light reflecting parts which are respectively located at left and right positions with respect to the given portion and have respective focuses on their respective optical axes, the optical axes being inclined with respect to the beam axis, each of the left and right concave light reflecting parts having respective curves of second degree when cut by vertical and horizontal planes; and first and second filaments of an electric bulb which are located on the beam axis. The optical axes of the left and right concave light reflecting parts are inclined toward the left and right concave light reflecting parts with respect to the beam axis, respectively, and the focuses of the left and right concave light reflecting parts are located at generally right and left positions with respect to the first filament, respectively.
Inventors
- 👤 Naohi Nino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:34
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: 14
Claim 1
Independent Claim
193 words
A headlamp unit comprising: a multi-surface concave reflector having a beam axis along which a light beam projects forward to produce a beam pattern, the reflector including: upper and lower cancave light reflecting parts which are respectively located at upper and lower positions with respect to a given portion of the reflector, and left and right concave light reflecting parts which are respectively located at left and right positions with respect to said given portion and have respective focuses on their respective optical axes, said optical axes being inclined with respect to the beam axis, each of the left and right concave light reflecting parts having respective curves of second degree when cut by vertical and horizontal planes; and first and second filaments of an electric bulb which are located on said beam axis, wherein the optical axes of said left and right concave light reflecting parts are inclined toward the left and right concave light reflecting parts with respect to said beam axis, respectively, and wherein the focuses of said left and right concave light reflecting parts are located at generally right and left positions with respect to said first filament, respectively.
Claim 2
Dependent Claim
193 words
A headlamp unit comprising: a multi-surface concave reflector having a beam axis along which a light beam projects forward to produce a beam pattern, the reflector including: upper and lower cancave light reflecting parts which are respectively located at upper and lower positions with respect to a given portion of the reflector, and left and right concave light reflecting parts which are respectively located at left and right positions with respect to said given portion and have respective focuses on their respective optical axes, said optical axes being inclined with respect to the beam axis, each of the left and right concave light reflecting parts having respective curves of second degree when cut by vertical and horizontal planes; and first and second filaments of an electric bulb which are located on said beam axis, wherein the optical axes of said left and right concave light reflecting parts are inclined toward the left and right concave light reflecting parts with respect to said beam axis, respectively, and wherein the focuses of said left and right concave light reflecting parts are located at generally right and left positions with respect to said first filament, respectively.
Claim 3
Dependent Claim
20 words
A headlamp unit as claimed in claim 1, in which said first and second filaments extend along said beam axis.
Claim 4
Dependent Claim
25 words
A headlamp unit as claimed in claim 2, in which each of said left and right concave light reflecting parts is of a parabolic surface.
Claim 5
Dependent Claim
25 words
A headlamp unit as claimed in claim 2, in which each of said left and right concave light reflecting parts is of an elliptic surface.
Claim 6
Dependent Claim
36 words
A headlamp unit as claimed in claim 2, in which each of said left and right concave light reflecting parts is of a complex reflecting surface which consists of a parabolic surface and an elliptic surface.
Claim 7
Dependent Claim
33 words
A headlamp unit as claimed in claim 5, in which said complex reflecting surface describes a parabola when cut by a vertical plane and describes an ellipse when cut by a horizontal plane.
Claim 8
Dependent Claim
33 words
A headlamp unit as claimed in claim 5, in which said complex reflecting surface describes an ellipse when cut by a vertical plane and describes a parabola when cut by a horizontal plane.
Claim 9
Dependent Claim
34 words
A headlamp unit as claimed in claim 2, in which said lower light reflecting part is of a paraboloid of revolution, and in which said upper light reflecting part is divided into two portions.
Claim 10
Dependent Claim
40 words
A headlamp unit as claimed in claim 8, in which each of said two portions of said upper light reflecting part describes a parabola when cut by a vertical plane and describes an ellipse when cut by a horizontal plane.
Claim 11
Dependent Claim
35 words
A headlamp unit as claimed in claim 9, in which one of said two portions is dislocated by a given angle with respect to a horizontal axis which passes through a center of said reflector.
Claim 12
Dependent Claim
24 words
A headlamp unit as claimed in claim 2, further comprising a lens which is mounted on a mouth portion of said multi-surface concave reflector.
Claim 13
Dependent Claim
33 words
A headlamp unit as claimed in claim 11, in which said lens has, at portions corresponding to the left and right light reflecting parts, a smoothed portion which is free of lens steps.
Claim 14
Dependent Claim
19 words
A headlamp unit as claimed in claim 2, in which said reflector has at its center a circular opening.
References Cited (Backward Citations)
US1471767A
Cited
US1691131A
Cited
US4208704A
Cited
US4238817A
Cited
US4612608A
Cited
US4772988A
Cited
US4841423A
Cited
US4755919A
Cited
US4704661A
Cited
US4803601A
Cited
US4924359A
Cited
US4885669A
Cited
US4918580A
Cited
US4916585A
Cited
US4928214A
Cited
US4953063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |