Patent US3923389A successfully refreshed from Google Patents.
US3923389A
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Method and apparatus for projecting a scene
Assignee: Polaroid Corp
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Filing: 1971-06-08
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Granted: 1975-12-02
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Expires: 1991-06-08
Abstract
Abstract A method and apparatus for projecting scenes recorded upon additive color 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 layed down in a repetitive sequence of colors such as red, green and blue. A diffraction grating of the transmission amplitude or phase variety is inserted in the optical path of a projector to cause zero and first order images of a recorded scene. The order images are mutually displaced so as to superimpose the film screen filter stripe images in a manner which substantially minimizes the visibility of the discrete color stripes at a display surface.
Inventors
- 👤 Howard G Rogers
- 👤 Kestutis Norvaisa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:15
CPC Classifications
G; G03; G03B; G03B33/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
Apparatus for projecting a scene recorded upon an image carrier as an array of regularly spaced color components arranged in a serially repetitive fashion comprising: means including a projection lens system for projecting said recorded scene through an optical path and providing a magnified image thereof at an image plane; and a diffraction grating formed upon an optical surface of said lens system for diffracting the image projected therethrough to derive at least zero and first order images from said components mutually spaced at said image plane such that any color component projected as a zero order image has superimposed upon it at least one separate color component projected as a first order image, whereby geometric patterns otherwise encountered during the projection of said array of the color components are caused to blend additively.
Claim 2
Dependent Claim
134 words
Apparatus for projecting a scene recorded upon an image carrier as an array of regularly spaced color components arranged in a serially repetitive fashion comprising: means including a projection lens system for projecting said recorded scene through an optical path and providing a magnified image thereof at an image plane; and a diffraction grating formed upon an optical surface of said lens system for diffracting the image projected therethrough to derive at least zero and first order images from said components mutually spaced at said image plane such that any color component projected as a zero order image has superimposed upon it at least one separate color component projected as a first order image, whereby geometric patterns otherwise encountered during the projection of said array of the color components are caused to blend additively.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |