Patent US4853591A successfully refreshed from Google Patents.
Patent US4914747A successfully refreshed from Google Patents.
US4914747A
Expired / Lapsed
US
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Vehicular headlamp
Assignee: Koito Manufacturing Co Ltd
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Filing: 1989-06-27
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Granted: 1990-04-03
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Expires: 2009-06-27
Abstract
Abstract Disclosed herein is a vehicular projector type headlamp. The headlamp comprises a concave light reflector which includes upper and lower reflector parts, each part constituting a part of an ellipsoidal light reflecting surface and having first and second focuses, the upper and lower reflector parts having a common optical axis and having the second focuses located on a common position, the first focus of the upper reflector part being in front of that of the lower reflector part; a first light source positioned at the first focus of the upper reflector part; a second light source positioned at the first focus of the lower reflector part; a shade plate positioned in front of the first and second light sources; and a converging lens arranged in front of the shade plate. The shade plate is arranged flat with respect to the optical axis and arranged in parallel with the optical axis having a front edge thereof positioned just behind the second focus, and the lens has its focus located at the front edge of the shade plate.
Inventors
- 👤 Naohi Nino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:45
CPC Classifications
F; F21; F21S; F21S41/00; F21S41/30; F21S41/32; F21S41/36; F21S41/365; F21S41/10; F21S41/14; F21S41/162; F21S41/164; F21S41/321; F21S41/323; F21S41/33; F21S41/334; F21S41/336; F21S41/37; F21S41/40; F21S41/43
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
167 words
A vehicular headlamp comprising: a concave light reflector which includes upper and lower reflector parts, each part constituting a part of an ellipsoidal light reflecting surface and having first and second focuses, said upper and lower reflector parts having a common optical axis and having the second focuses located at a common point, the first focus of said upper reflector part being in front of that of said lower reflector part; a first light source positioned at the first focus of said upper reflector part; a second light source positioned at the first focus of said lower reflector part; a shade plate positioned in front of said first and second light sources, said shade plate being arranged flat with respect to said optical axis and arranged in parallel with said optical axis having a front edge thereof positioned just behind said second focus; a converging lens arranged in front of said shade plate, said lens having its focus located at said front edge of said shade plate.
Claim 2
Dependent Claim
167 words
A vehicular headlamp comprising: a concave light reflector which includes upper and lower reflector parts, each part constituting a part of an ellipsoidal light reflecting surface and having first and second focuses, said upper and lower reflector parts having a common optical axis and having the second focuses located at a common point, the first focus of said upper reflector part being in front of that of said lower reflector part; a first light source positioned at the first focus of said upper reflector part; a second light source positioned at the first focus of said lower reflector part; a shade plate positioned in front of said first and second light sources, said shade plate being arranged flat with respect to said optical axis and arranged in parallel with said optical axis having a front edge thereof positioned just behind said second focus; a converging lens arranged in front of said shade plate, said lens having its focus located at said front edge of said shade plate.
Claim 3
Dependent Claim
47 words
A vehicular headlamp as claimed in claim 1, in which said front edge of said shade plate has a middle portion thereof positioned just behind said second focus, and in which said focus of said converging lens is positioned on said middle portion of the shade plate.
Claim 4
Dependent Claim
27 words
A vehicular headlamp as claimed in claim 2, in which said first and second light sources are respective filaments which are contained in a common electric bulb.
Claim 5
Dependent Claim
21 words
A vehicular headlamp as claimed in claim 3, in which each filament of said electric bulb extends along said optical axis.
Claim 6
Dependent Claim
28 words
A vehicular headlamp as claimed in claim 4, in which lower and front portions of the filament corresponding to said first light source are concealed by a cover.
Claim 7
Dependent Claim
23 words
A vehicular headlamp as claimed in claim 5, in which said electric bulb has a front portion coated with a light shading film.
Claim 8
Dependent Claim
29 words
A vehicular headlamp as claimed in claim 2, in which at least one of upper and lower surfaces of said shade plate is lined with a light reflecting layer.
Claim 9
Dependent Claim
37 words
A vehicular headlamp as claimed in claim 7, in which the light reflecting surface of said shade plate has a narrow nonreflective portion which is positioned near and extends along said front edge of said shade plate.
Claim 10
Dependent Claim
19 words
A vehicular headlamp as claimed in claim 8, in which said narrow portion is coated with a nonreflective paint
Claim 11
Dependent Claim
60 words
A vehicular headlamp as claimed in claim 7, in which said shade plate is so arranged that a focus of said converging lens with respect to blue light is located at the front edge of said shade plate and another focus of said lens with respect to red light is located at a rear edge of said narrow nonreflective portion.
Claim 12
Dependent Claim
23 words
A vehicular headlamp as claimed in claim 2, in which the front edge portion of said shade plate has a smoothly curved recess.
Claim 13
Dependent Claim
29 words
A vehicular headlamp as claimed in claim 11, in which at least one of upper and lower surfaces of said shade plate is lined with a light reflecting layer.
Claim 14
Dependent Claim
38 words
A vehicular headlamp as claimed in claim 12, in which the light reflecting surface of said shade plate has a narrow nonreflective portion which is positioned near and extends along the recessed front edge of said shade plate.
Claim 15
Dependent Claim
23 words
A vehicular headlamp as claimed in claim 2, in which the front edge of said shade plate includes two intersecting linear wall portions.
Claim 16
Dependent Claim
19 words
A vehicular headlamp as claimed in claim 2 in which said shade plate is constructed of a stepped plate.
Claim 17
Dependent Claim
19 words
A vehicular headlamp as claimed in claim 2 in which said shade plate has the front edge partially raised.
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) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |