US4034217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical device for lighting apparatus, with a plurality of combined reflectors
Assignee: Individual
•
Filing: 1975-06-20
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Granted: 1977-07-05
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Expires: 1995-06-20
Abstract
Abstract An optical device for lighting including a plurality of combined reflectors to control a beam of light from a lamp and to direct it forward, so no reflected beam passes through the lamp and the light leaving the opening of the reflector forms a parallel beam.
Inventors
- 👤 Roger Louis Dumont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:40
CPC Classifications
F; F21; F21V; F21V17/00; F21V17/10; F21V17/101; F21V7/00; F21V7/04; F21V7/09
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
121 words
An optical device for a luminous source for producing a beam of light having an axis, said device comprising first, second and third reflecting surfaces, said first surface being described by an arc of an ellipse having a first focus coincident with said luminous source and a second focus, said second reflecting surface being described by an arc of a parabola having an axis parallel to the axis of the beam of light, the focus of said parabola being coincident with said second focus of said ellipse and said third reflecting surface described by an arc of a curve of second degree positioned between said second reflecting surface and said axis, the focus of said third surface coincident with said source.
Claim 2
Dependent Claim
121 words
An optical device for a luminous source for producing a beam of light having an axis, said device comprising first, second and third reflecting surfaces, said first surface being described by an arc of an ellipse having a first focus coincident with said luminous source and a second focus, said second reflecting surface being described by an arc of a parabola having an axis parallel to the axis of the beam of light, the focus of said parabola being coincident with said second focus of said ellipse and said third reflecting surface described by an arc of a curve of second degree positioned between said second reflecting surface and said axis, the focus of said third surface coincident with said source.
Claim 3
Dependent Claim
26 words
The device according to claim 1 wherein the arc of an ellipse and the arc of a parabola have their concavities directed toward said beam axis.
Claim 4
Dependent Claim
42 words
A device according to claim 1 additionally including a fourth reflecting surface described by an arc of a curve of second degree positioned between the third reflecting surface and said beam axis, the focus of said fourth surface coincident with said source.
Claim 5
Dependent Claim
15 words
A device according to claim 1 wherein said curve of second degree is a parabola.
Claim 6
Dependent Claim
19 words
A reflector according to claim 3 wherein the fourth reflecting surface is described by an arc of a parabola.
Claim 7
Dependent Claim
22 words
A device according to claim 1 wherein said curve of second degree is a hyperbola having a focus positioned behind the reflector.
Claim 8
Dependent Claim
24 words
A device according to claim 1 wherein said curve of second degree is an ellipse having a focus positioned in front of the reflector.
Claim 9
Dependent Claim
149 words
An optical device for a luminous source for producing a beam of light having an axis, said device comprising first and second reflecting surfaces, said first surface being described by an arc of an ellipse having a first focus coincident with said luminous source and a second focus, said second reflecting surface being described by an arc of a parabola having an axis parallel to the axis of the beam of light, the focus of said parabola being coincident with said second focus of said ellipse and an intermediate reflecting surface described by an arc of a parabola whose axis is parallel to the axis of the luminous beam, the focus of said intermediate reflecting surface coinciding with the luminous source, said intermediate surface extending between said first and said second surfaces to reflect the light issued from the source in the area between the first and second surfaces.
Claim 10
Dependent Claim
149 words
An optical device for a luminous source for producing a beam of light having an axis, said device comprising first and second reflecting surfaces, said first surface being described by an arc of an ellipse having a first focus coincident with said luminous source and a second focus, said second reflecting surface being described by an arc of a parabola having an axis parallel to the axis of the beam of light, the focus of said parabola being coincident with said second focus of said ellipse and an intermediate reflecting surface described by an arc of a parabola whose axis is parallel to the axis of the luminous beam, the focus of said intermediate reflecting surface coinciding with the luminous source, said intermediate surface extending between said first and said second surfaces to reflect the light issued from the source in the area between the first and second surfaces.
Claim 11
Dependent Claim
153 words
An optical device for a luminous source for producing a beam of light having an axis, said device comprising first and second reflecting surfaces, said first surface being described by an arc of an ellipse having a first focus coincident with said luminous source and a second focus, said second reflecting surface being described by an arc of a parabola having an axis parallel to the axis of the beam of light, the focus of said parabola being coincident with said second focus of said ellipse and an intermediate reflecting surface described by an arc of a curve of the second degree whose axis is parallel to the axis of the luminous beam, the focus of said intermediate reflecting surface coinciding with the luminous source, said intermediate surface extending between said first and said second surfaces to reflect the light issued from the source in the area between the first and second surfaces.
Claim 12
Dependent Claim
153 words
An optical device for a luminous source for producing a beam of light having an axis, said device comprising first and second reflecting surfaces, said first surface being described by an arc of an ellipse having a first focus coincident with said luminous source and a second focus, said second reflecting surface being described by an arc of a parabola having an axis parallel to the axis of the beam of light, the focus of said parabola being coincident with said second focus of said ellipse and an intermediate reflecting surface described by an arc of a curve of the second degree whose axis is parallel to the axis of the luminous beam, the focus of said intermediate reflecting surface coinciding with the luminous source, said intermediate surface extending between said first and said second surfaces to reflect the light issued from the source in the area between the first and second surfaces.
Claim 13
Dependent Claim
112 words
An optical device for a luminous source for producing a beam of light having an axis, said device comprising first and second reflecting surfaces, said first surface being described by an arc of an ellipse having a first focus coincident with said luminous source and a second focus, said second reflecting surface being described by an arc of a parabola having an axis parallel to the axis of the beam of light, the focus of said parabola being coincident with said second focus of said ellipse, said luminous source being a surface of revolution about the axis of the beam and said reflecting surfaces being a surface of revolution about said axis.
Claim 14
Dependent Claim
112 words
An optical device for a luminous source for producing a beam of light having an axis, said device comprising first and second reflecting surfaces, said first surface being described by an arc of an ellipse having a first focus coincident with said luminous source and a second focus, said second reflecting surface being described by an arc of a parabola having an axis parallel to the axis of the beam of light, the focus of said parabola being coincident with said second focus of said ellipse, said luminous source being a surface of revolution about the axis of the beam and said reflecting surfaces being a surface of revolution about said axis.
Claim 15
Dependent Claim
121 words
An optical device for a luminous source for producing a beam of light having an axis, said device comprising first and second reflecting surfaces, said first surface being described by an arc of an ellipse having a first focus coincident with said luminous source and a second focus, said second reflecting surface being described by an arc of a parabola having an axis parallel to the axis of the beam of light, the focus of said parabola being coincident with said second focus of said ellipse and a housing having plates constituting the reflecting surfaces provided with tongues positionable in corresponding apertures of the housing with said tongues being bent relative to said apertures for securing the plates in said housing.
Claim 16
Dependent Claim
121 words
An optical device for a luminous source for producing a beam of light having an axis, said device comprising first and second reflecting surfaces, said first surface being described by an arc of an ellipse having a first focus coincident with said luminous source and a second focus, said second reflecting surface being described by an arc of a parabola having an axis parallel to the axis of the beam of light, the focus of said parabola being coincident with said second focus of said ellipse and a housing having plates constituting the reflecting surfaces provided with tongues positionable in corresponding apertures of the housing with said tongues being bent relative to said apertures for securing the plates in said housing.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |