Patent US4094269A successfully refreshed from Google Patents.
Patent US3887262A successfully refreshed from Google Patents.
US3887262A
Expired / Lapsed
US
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Light equalizer and method of making same
Assignee: ERT Inc
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Filing: 1974-04-05
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Granted: 1975-06-03
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Expires: 1994-04-05
Abstract
Abstract A light equalizer having an output aperture across which each area element exhibits substantially the same emission intensity regardless of the distribution of light into the input aperture of the equalizer. The equalizer is embodied in a stack of a plurality of transmissive elements, a number of which provide a multiplicity of light scattering centers. The exterior surface of the equalizer is covered with an internally reflective coating except for the input and output apertures.
Inventors
- 👤 Jr Henry H Blau
- 👤 Paul L Kebabian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:09
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/09; G02B27/0938; G02B27/0994; G01; G01J; G01J3/00; G01J3/02; G01J3/0205; G01J3/0208; G02B27/0927; G02B27/30; G02B27/40; G02B5/00; G02B5/02; G02B5/0205; G02B5/0236; G02B5/0268; G02B5/0273; G02B5/0278; H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0802; H04B7/0805; H04B7/0814
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
108 words
A light equalizer for providing substantially uniform distribution of light across an output aperture, said equalizer comprising in combination; a plurality of light transmissive elements each having opposed surfaces, said elements being arranged in a stack substantially along a common axis with all of said surfaces, except the end surfaces of said stack, adjacent at least one other surface of another said element, said end surfaces respectively constituting an input aperture and said output aperture; at least one of said elements providing a multiplicity of light scattering centers; and an internally reflective cover disposed over substantially all of the exterior surface of said stack, except said end surfaces.
Claim 2
Dependent Claim
108 words
A light equalizer for providing substantially uniform distribution of light across an output aperture, said equalizer comprising in combination; a plurality of light transmissive elements each having opposed surfaces, said elements being arranged in a stack substantially along a common axis with all of said surfaces, except the end surfaces of said stack, adjacent at least one other surface of another said element, said end surfaces respectively constituting an input aperture and said output aperture; at least one of said elements providing a multiplicity of light scattering centers; and an internally reflective cover disposed over substantially all of the exterior surface of said stack, except said end surfaces.
Claim 3
Dependent Claim
108 words
A light equalizer for providing substantially uniform distribution of light across an output aperture, said equalizer comprising in combination; a plurality of light transmissive elements each having opposed surfaces, said elements being arranged in a stack substantially along a common axis with all of said surfaces, except the end surfaces of said stack, adjacent at least one other surface of another said element, said end surfaces respectively constituting an input aperture and said output aperture; at least one of said elements providing a multiplicity of light scattering centers; and an internally reflective cover disposed over substantially all of the exterior surface of said stack, except said end surfaces.
Claim 4
Dependent Claim
108 words
A light equalizer for providing substantially uniform distribution of light across an output aperture, said equalizer comprising in combination; a plurality of light transmissive elements each having opposed surfaces, said elements being arranged in a stack substantially along a common axis with all of said surfaces, except the end surfaces of said stack, adjacent at least one other surface of another said element, said end surfaces respectively constituting an input aperture and said output aperture; at least one of said elements providing a multiplicity of light scattering centers; and an internally reflective cover disposed over substantially all of the exterior surface of said stack, except said end surfaces.
Claim 5
Dependent Claim
39 words
A light equalizer as defined in claim 1 wherein said at least one of said elements is formed of a plurality of minute particles in a matrix, the respective indices of refraction of said particles and matrax being different.
Claim 6
Dependent Claim
27 words
A light equalizer as defined in claim 2 wherein one of said matrix and particles is KBr and the other of said matrix and particles is CsI.
Claim 7
Dependent Claim
27 words
A light equalizer as defined in claim 2 wherein one of said matrix and particles is KBr and the other of said matrix and particles is NaCl.
Claim 8
Dependent Claim
22 words
A light equalizer as defined in claim 2 wherein the difference between the indices of said particles and matrix is a gradiant.
Claim 9
Dependent Claim
29 words
A light equalizer as defined in claim 1 wherein said at least one of said elements has a plurality of scattering centers substantially uniformly distributed through the bulk thereof.
Claim 10
Dependent Claim
25 words
A light equalizer as defined in claim 1 wherein at least one surface of said at least one of said elements is a diffusing surface.
Claim 11
Dependent Claim
33 words
A light equalizer as defined in claim 1 wherein said at least one of said elements has a plurality of refracting lenticular elements disposed along a surface which is transverse to said axis.
Claim 12
Dependent Claim
18 words
A light equalizer as defined in claim 1 wherein said adjacent surfaces are in contact with one another.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |