US4159511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shadowless lighting appliance for surgical operating theatres and the like
Assignee: SA "SDMC"
•
Filing: 1977-11-30
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Granted: 1979-06-26
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Expires: 1997-11-30
Abstract
Abstract The invention relates to a shadowless lighting appliance more particularlypplicable for illuminating areas exposed for surgery in operating theatres. A lighting appliance according to this invention is characterized by the fact that it includes at least the following combination of means: - a light source; - a reflecting surface of revolution and - a glass formed of dioptric radial elements, the function of each element being to provide, by refraction to either side of a radial plane, the spreading of a beam of light reflected by a portion of said reflecting surface proximate a generatrix thereof, such that the elemental patch of light obtained on a plane be a luminous quadrilateral. In one form of embodiment, the above combination of means further includes a sleeve consisting of an optical system surrounding the light source.
Inventors
- 👤 Pierre Dejonc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:49
CPC Classifications
F; F21; F21V; F21V5/00; F21V5/04; F21V13/00; F21V13/02; F21V13/04; F21V7/00; F21V7/0008; F21W; F21W2131/00; F21W2131/20; F21W2131/205; Y; Y10; Y10S; Y10S362/00; Y10S362/804
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
A shadowless lighting appliance comprising: an operating plane, a light source means, a concave reflecting surface of revolution, glass formed of dioptric elements in a radial plane patterned around said outer edge, each of said elements being of a length shorter than the radius of said radial plane and providing by refraction to either side of said radial plane a spreading of a beam of light reflected by a portion of said concave reflecting surface, and an element patch of light in the form of a luminous quadrilateral on said operating plane.
Claim 2
Dependent Claim
92 words
A shadowless lighting appliance comprising: an operating plane, a light source means, a concave reflecting surface of revolution, glass formed of dioptric elements in a radial plane patterned around said outer edge, each of said elements being of a length shorter than the radius of said radial plane and providing by refraction to either side of said radial plane a spreading of a beam of light reflected by a portion of said concave reflecting surface, and an element patch of light in the form of a luminous quadrilateral on said operating plane.
Claim 3
Dependent Claim
23 words
A lighting appliance as claimed in claim 1, wherein each dioptric element is a fluting included between two planes forming an angle therebetween.
Claim 4
Dependent Claim
74 words
A lighting appliance as claimed in claim 1, wherein each dioptric element is a fluting included between two planes forming an angle therebetween, each fluting having a width which varies from the centre to the edge of the glass and the interior surface of each fluting being curved and having a continuously variable radius of curvature, said spreading of the beam of light from one end to the other of the fluting being identical.
Claim 5
Dependent Claim
74 words
A lighting appliance as claimed in claim 1, wherein each dioptric element is a fluting included between two planes forming an angle therebetween, each fluting having a width which varies from the centre to the edge of the glass and the interior surface of each fluting being concave and having a continuously variable radius of curvature, said spreading of the beam of light from one end to the other of the fluting being identical.
Claim 6
Dependent Claim
74 words
A lighting appliance as claimed in claim 1, wherein each dioptric element is a fluting included between two planes forming an angle therebetween, each fluting having a width which varies from the centre to the edge of the glass and the interior surface of each fluting being convex and having a continuously variable radius of curvature, said spreading of the beam of light from one end to the other of the fluting being identical.
Claim 7
Dependent Claim
106 words
A shadowless lighting appliance comprising: an operating plane, a light source means, a sleeve consisting of an optical system placed around said light source means, a conical reflecting surface of a revolution, glass formed of dioptric elements in a radial plane patterned around said outer edge, each of said elements being of a length shorter than the radius of said radial plane and providing by refraction to either side of said radial plane a spreading of a beam of light reflected by a portion of said conical reflecting surface, and an elemental patch of light in the form of a luminous quadrilateral on said operating plane.
Claim 8
Dependent Claim
106 words
A shadowless lighting appliance comprising: an operating plane, a light source means, a sleeve consisting of an optical system placed around said light source means, a conical reflecting surface of a revolution, glass formed of dioptric elements in a radial plane patterned around said outer edge, each of said elements being of a length shorter than the radius of said radial plane and providing by refraction to either side of said radial plane a spreading of a beam of light reflected by a portion of said conical reflecting surface, and an elemental patch of light in the form of a luminous quadrilateral on said operating plane.
Claim 9
Dependent Claim
23 words
A lighting appliance as claimed in claim 6, wherein each dioptric element is a fluting included between two planes forming an angle therebetween.
Claim 10
Dependent Claim
74 words
A lighting appliance as claimed in claim 6, wherein each dioptric element is a fluting included between two planes forming an angle therebetween, each fluting having a width which varies from the centre to the edge of the glass and the interior surface of each fluting being curved and having a continuously variable radius of curvature, said spreading of the beam of light from one end to the other of the fluting being identical.
Claim 11
Dependent Claim
74 words
A lighting appliance as claimed in claim 6, wherein each dioptric element is a fluting included between two planes forming an angle therebetween, each fluting having a width which varies from the centre to the edge of the glass and the interior surface of each fluting being concave and having a continuously variable radius of curvature, said spreading of the beam of light from one end to the other of the fluting being identical.
Claim 12
Dependent Claim
74 words
A lighting appliance as claimed in claim 6, wherein each dioptric element is a fluting included between two planes forming an angle therebetween, each fluting having a width which varies from the centre to the edge of the glass and the interior surface of each fluting being convex and having a continuously variable radius of curvature, said spreading of the beam of light from one end to the other of the fluting being identical.
References Cited (Backward Citations)
US389878A
Cited
US1597185A
Cited
US1642339A
Cited
GB375943A
Cited
US1990390A
Cited
DE1622028A1
Cited
US3928757A
Cited
DE2451926A1
Cited
US4037096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |