US4965876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting apparatus
Assignee: Individual
•
Filing: 1989-05-26
•
Granted: 1990-10-23
•
Expires: 2009-05-26
Abstract
Abstract A lighting apparatus is provided having a plurality N of light sources arranged annularly around the optical axis of a reflector. The efficiency of such an apparatus and its service life are improved by providing a central mirrored column which is symmetrically disposed with respect to the light sources. The column has C N or D N symmetry and reflects light emitted by the light sources away from the light sources themselves, thereby reducing the amount of light reflected back at the light sources and reducing their thermal load. The column has peaks that extend into the notional annulus on which the light sources are arranged to shield adjacent light sources from each other.
Inventors
- 👤 Tivadar Foldi
- 👤 Gabor Biro
- 👤 Tamas Barna
- 👤 Imre Nagy
- 👤 Laszlo Vincze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:34
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/04; F21V7/09
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
151 words
A lamp structure which comprises: (i) a concave reflector having an axis (ii) a plurality of light sources, wherein the number of light sources is N, said light sources being spaced apart within said reflector and arranged about said axis on a notional annulus (iii) a body disposed within the reflector substantially concentrically about said axis said body having a plurality of reflective segments on its surface outwardly from said axis, the number of reflective segments being N or a multiple of N, each segment viewed in cross-section having at least two curved surfaces that meet together in a peak, each light source being located opposite to the peak of a respective segment, and wherein intermediate between each pair of adjacent light sources, the body includes a further peak that extends into the notional annulus on which the light sources are arranged to shield the adjacent light sources from each other.
Claim 2
Dependent Claim
151 words
A lamp structure which comprises: (i) a concave reflector having an axis (ii) a plurality of light sources, wherein the number of light sources is N, said light sources being spaced apart within said reflector and arranged about said axis on a notional annulus (iii) a body disposed within the reflector substantially concentrically about said axis said body having a plurality of reflective segments on its surface outwardly from said axis, the number of reflective segments being N or a multiple of N, each segment viewed in cross-section having at least two curved surfaces that meet together in a peak, each light source being located opposite to the peak of a respective segment, and wherein intermediate between each pair of adjacent light sources, the body includes a further peak that extends into the notional annulus on which the light sources are arranged to shield the adjacent light sources from each other.
Claim 3
Dependent Claim
17 words
The lamp structure of claim 1, wherein the said body has D N or C N symmetry.
Claim 4
Dependent Claim
44 words
The lamp structure of claim 1, wherein each curved surface of each segment, in cross-section, has a geometric shape corresponding to a section of a circle, of a sinusoidal wave or of the involute of a parabola or of a curve of higher power.
Claim 5
Dependent Claim
31 words
The lamp structure of claim 3, wherein the said geometric shapes have been stretched, contracted, stretched and contracted, rotated, stretched and rotated, contracted and rotated or stretched and contracted and rotated.
Claim 6
Dependent Claim
18 words
The lamp structure of claim 1, wherein the reflecting surfaces of the central mirrored body are partially diffusing.
Claim 7
Dependent Claim
27 words
The lamp structure of claim 1, wherein each of the said further peaks extends into the said annulus but does not extend completely through the said annulus.
Claim 8
Dependent Claim
21 words
The lamp structure of claim 1, wherein the concave surface of the reflector has the shape of a body of rotation.
Claim 9
Dependent Claim
19 words
The lamp structure of claim 7, wherein the reflector has the shape of a higher order than a paraboloid.
Claim 10
Dependent Claim
27 words
The lamp structure of claim 8, wherein the reflector has an annular focal area and the said light sources are arranged in the vicinity of that area.
Claim 11
Dependent Claim
21 words
The lamp structure of claim 1, wherein separate light sources are connected to separate phases of a phase-shifted alternating current supply.
References Cited (Backward Citations)
GB282255A
Cited
DE1227404B
Cited
US3264467A
Cited
US3686940A
Cited
US4651257A
Cited
US4816694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |