US3728014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 22:47
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.
References Cited (Backward Citations)
US1836787A
Cited
US992151A
Cited
US1989553A
Cited
US2451164A
Cited
US3045531A
Cited
US2985866A
Cited
US3095475A
Cited
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 |