Patent US4809147A successfully refreshed from Google Patents.
US4809147A
Expired / Lapsed
US
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Lighting device
Assignee: Individual
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Filing: 1988-04-25
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Granted: 1989-02-28
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Expires: 2008-04-25
Abstract
Abstract A lighting device having a light source L and a reflector R positioned behind the light source is disclosed in which a three-dimensional configuration is given to the reflector R with the aid of the computer so that it can provide a particular reflection pattern to the light reflected by the reflector R. Due to a particular curvature or configuration of the reflecting surface of the reflector R, the light rays emanating from the light source and reflected at any point on the reflecting surface intersect or cut across each other at innumerable different points in space. Further, the reflector is provided with a three-dimensional curvature or shape so that it can give the incident light rays a preselected luminous flux distribution. The lighting device is adapted for application in a variety of uses enabled by its special reflection paths of light rays.
Inventors
- 👤 Masataka Negishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:35
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/10; F; F21; F21S; F21S8/00; F21S8/02; F21V; F21V7/00; F21V7/04; G02B19/00; G02B19/0004; G02B19/0019; G02B19/0023; G02B19/0033; G02B19/0047; F21Y; F21Y2103/00; F21Y2103/30; F21Y2103/33
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
157 words
A lighting device comprising: a light source; and a reflector for reflecting light rays emanating from said light source, said light source and said reflector having an optical axis, said reflector having at least a partially continuous reflecting surface of a shape symmetrical with respect to said optical axis, having no focal point and having a shape for causing light rays reflected by a part of the reflecting surface on one side of said optical axis, when viewed in a direction perpendicular to said optical axis, to intersect other light rays reflected by said reflecting surface on the other side of the optical axis at innumerable different points which are distributed in three dimensions both in the direction of said optical axis and transversely thereof and which are positioned symmetrically with respect to said optical axis, said reflecting surface having a shape for reflecting the light rays therefrom as non-parallel rays with a uniform luminous flux distribution.
Claim 2
Dependent Claim
157 words
A lighting device comprising: a light source; and a reflector for reflecting light rays emanating from said light source, said light source and said reflector having an optical axis, said reflector having at least a partially continuous reflecting surface of a shape symmetrical with respect to said optical axis, having no focal point and having a shape for causing light rays reflected by a part of the reflecting surface on one side of said optical axis, when viewed in a direction perpendicular to said optical axis, to intersect other light rays reflected by said reflecting surface on the other side of the optical axis at innumerable different points which are distributed in three dimensions both in the direction of said optical axis and transversely thereof and which are positioned symmetrically with respect to said optical axis, said reflecting surface having a shape for reflecting the light rays therefrom as non-parallel rays with a uniform luminous flux distribution.
Claim 3
Dependent Claim
136 words
A lighting device comprising: a light source; and a reflector for reflecting light rays emanating from said light source, said light source and said reflector having an optical axis, said reflector having at least a partially continuous reflecting surface of a symmetrical shape with respect to said optical axis, having no focal point and for causing light rays reflected by the reflecting surface on one side of said reflector with respect to the optical axis to be directed to the other side of the optical axis and for causing the light rays reflected by said one side and the light rays reflected by said other side to intersect each other at innumerable points which are distributed on said optical axis, and for reflecting the light rays therefrom as non-parallel rays with a uniform luminous flux distribution.
Claim 4
Dependent Claim
136 words
A lighting device comprising: a light source; and a reflector for reflecting light rays emanating from said light source, said light source and said reflector having an optical axis, said reflector having at least a partially continuous reflecting surface of a symmetrical shape with respect to said optical axis, having no focal point and for causing light rays reflected by the reflecting surface on one side of said reflector with respect to the optical axis to be directed to the other side of the optical axis and for causing the light rays reflected by said one side and the light rays reflected by said other side to intersect each other at innumerable points which are distributed on said optical axis, and for reflecting the light rays therefrom as non-parallel rays with a uniform luminous flux distribution.
Claim 5
Dependent Claim
17 words
A lighting device as claimed in claim 2 wherein said light source is a point light source.
Claim 6
Dependent Claim
16 words
A lighting device as claimed in claim 2 wherein said light source has an annular shape.
Claim 7
Dependent Claim
39 words
A lighting device as claimed in claim 2 wherein the reflecting surface is shaped for causing the light rays reflected thereby on the same side with respect to the optical axis to intersect each other at innumerable different points.
Claim 8
Dependent Claim
157 words
A lighting device comprising: a light source; and a reflector for reflecting light rays emanating from said light source, said light source and said reflector having an optical axis, said reflector having at least a partially continuous reflecting surface of a symmetrical shape with respect to a plane passing through said optical axis, having no focal point and having a shape for causing light rays reflected by a part of the reflecting surface on one side of said plane, when viewed in a direction included in said plane, to intersect other light rays reflected by said reflecting surface on the other side of said plane at innumerable different points which are distributed in three dimensions both in the direction of said optical axis and transversely thereof and which are positioned symmetrically with respect to said plane, said reflecting surface having a shape for reflecting the light rays therefrom as non-parallel rays with a uniform luminous flux distribution.
Claim 9
Dependent Claim
157 words
A lighting device comprising: a light source; and a reflector for reflecting light rays emanating from said light source, said light source and said reflector having an optical axis, said reflector having at least a partially continuous reflecting surface of a symmetrical shape with respect to a plane passing through said optical axis, having no focal point and having a shape for causing light rays reflected by a part of the reflecting surface on one side of said plane, when viewed in a direction included in said plane, to intersect other light rays reflected by said reflecting surface on the other side of said plane at innumerable different points which are distributed in three dimensions both in the direction of said optical axis and transversely thereof and which are positioned symmetrically with respect to said plane, said reflecting surface having a shape for reflecting the light rays therefrom as non-parallel rays with a uniform luminous flux distribution.
Claim 10
Dependent Claim
138 words
A lighting device comprising: a light source; and a reflector for reflecting light rays emanating from said light source, said light source and said reflector having an optical axis, said reflector having at least a partially continuous reflecting surface of a symmetrical shape with respect to said optical axis, having no focal point and for causing light rays reflected by the reflecting surface on one side of said reflector with respect to a plane passing through the optical axis to be directed to the other side of the plane and for causing the light rays reflected by said one side and the light rays reflected by said other side to intersect each other at innumerable points which are distributed on said plane, and for reflecting the light rays therefrom as non-parallel rays with a uniform luminous flux distribution.
Claim 11
Dependent Claim
138 words
A lighting device comprising: a light source; and a reflector for reflecting light rays emanating from said light source, said light source and said reflector having an optical axis, said reflector having at least a partially continuous reflecting surface of a symmetrical shape with respect to said optical axis, having no focal point and for causing light rays reflected by the reflecting surface on one side of said reflector with respect to a plane passing through the optical axis to be directed to the other side of the plane and for causing the light rays reflected by said one side and the light rays reflected by said other side to intersect each other at innumerable points which are distributed on said plane, and for reflecting the light rays therefrom as non-parallel rays with a uniform luminous flux distribution.
Claim 12
Dependent Claim
17 words
A lighting device as claimed in claim 7 wherein said light source is a point light source.
Claim 13
Dependent Claim
16 words
A lighting device as claimed in claim 7 wherein said light source has an annular shape.
Claim 14
Dependent Claim
40 words
A lighting device as claimed in claim 7 wherein the reflecting surface is shaped for causing the light rays reflected thereby on the same side with respect to the plane passing therethrough to intersect each other at innumerable different 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) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |