Patent US3728014A successfully refreshed from Google Patents.
US3728014A
Expired / Lapsed
US
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Apparatus for projecting a scene
Assignee: Polaroid Corp
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Filing: 1971-05-24
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Granted: 1973-04-17
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Expires: 1991-05-24
Abstract
Abstract A system and apparatus for projecting scenes upon color additive film. This film is typically configured having a filter screen portion overlaying an image carrying base. The filter screen may be formed as an array of parallel color stripes laid down in a repetitive sequence of colors such as the primaries red, green and blue. A diffraction grating of a phase variety is inserted in the optical path of a projector to cause the projection of zero and first order images of a scene recorded upon the film. The diffraction grating incorporates a surface which is sinusoidal in cross section and is designed so as to cause a replication and mutual displacement of a film image resulting in a blending of the components thereof at a display surface.
Inventors
- 👤 W Rosenblum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:54
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/1006; G02B27/102; G02B27/1086; G02B5/00; G02B5/18; G02B5/1866; G02B5/1871
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
Apparatus for projecting a scene recorded upon image carrier as an array of regularly spaced serially repetitive color components of selected wavelengths, lambda , comprising: means including an optical objective for projecting said recorded scene through an optical path having an axis Z and providing a magnified image thereof aT an image plane at which x and y axes may be defined; and grating means interposed within and normal to said optical path closely adjacent said optical objective and configured for interposing a medium having a length l height l'' and sinusoidally varying optical thickness, said grating means being spaced from said image plane a distance z, said medium being formed to cause a Fraunhofer form of diffraction of the image projected therethrough and derive zero and first order images, q, of each said color component having a respective intensity pattern at said image plane representable by the expression:
Claim 2
Dependent Claim
149 words
Apparatus for projecting a scene recorded upon image carrier as an array of regularly spaced serially repetitive color components of selected wavelengths, lambda , comprising: means including an optical objective for projecting said recorded scene through an optical path having an axis Z and providing a magnified image thereof aT an image plane at which x and y axes may be defined; and grating means interposed within and normal to said optical path closely adjacent said optical objective and configured for interposing a medium having a length l height l'' and sinusoidally varying optical thickness, said grating means being spaced from said image plane a distance z, said medium being formed to cause a Fraunhofer form of diffraction of the image projected therethrough and derive zero and first order images, q, of each said color component having a respective intensity pattern at said image plane representable by the expression:
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein said grating means is a fully transmissive phase grating.
Claim 4
Dependent Claim
49 words
The apparatus of claim 1 in which said grating means is a fully transmissive phase grating having a frequency, f, selected for causing said order image spacing such that any said color component image at said image plane has superposed upon it the image of an adjacent color component.
Claim 5
Dependent Claim
22 words
The apparatus of claim 1 in which said grating means is formed upon an optical surface of said optical objective lens system.
Claim 6
Dependent Claim
19 words
The apparatus of claim 1 wherein said maximum range alteration, m, is selected having a value of about 140*.
Claim 7
Dependent Claim
37 words
The apparatus of claim 1 in which said grating means orientation with respect to said optical path is selectively variable by rotation about said z axis so as to provide for selective tuning of said magnified image.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |