Patent US3749469A successfully refreshed from Google Patents.
US3749469A
Expired / Lapsed
US
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Redundant fraunhofer recording system
Assignee: RCA Corp
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Filing: 1971-12-09
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Granted: 1973-07-31
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Expires: 1991-12-09
Abstract
Abstract When a pinhole array is employed as a redundancy means in recording a redundant Fraunhofer hologram, such as a holographically prerecorded motion picture, a moving noise is normally present in the reconstructed image when the hologram is moved during playback. The effect of this moving noise is eliminated by situating the hologram recording medium at or in the immediate vicinity of the image plane of the pinhole array during the recording of the hologram. By recording the hologram in this manner, flicker-type noise is also improved.
Inventors
- 👤 T Gayeski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:48
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/32; G03H2223/00; G03H2223/12; G03H2223/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
170 words
In a redundant Fraunhofer hologram recording system for recording a plurality of motion picture frame objects, comprising: a. focusing lens means having a given focal length, one of said objects located substantially in the focal plane of said lens means on one side thereof, a hologram recording medium located on the other side of said lens means from said one object, and means including a pinhole array located on said one side of said lens means for illuminating said medium with an information beam of coherent wave energy which is spatially modulated in accordance with said one object, and means for simultaneously illuminating said medium with a reference beam of wave energy which is coherent with said information beam; b. the improvement wherein the respective distances of said pinhole array and said medium from the principal plane of said focusing lens means are selected with respect to said focal length so that said medium is located at or in the immediate vicinity of the image plane of said pinhole array.
Claim 2
Dependent Claim
170 words
In a redundant Fraunhofer hologram recording system for recording a plurality of motion picture frame objects, comprising: a. focusing lens means having a given focal length, one of said objects located substantially in the focal plane of said lens means on one side thereof, a hologram recording medium located on the other side of said lens means from said one object, and means including a pinhole array located on said one side of said lens means for illuminating said medium with an information beam of coherent wave energy which is spatially modulated in accordance with said one object, and means for simultaneously illuminating said medium with a reference beam of wave energy which is coherent with said information beam; b. the improvement wherein the respective distances of said pinhole array and said medium from the principal plane of said focusing lens means are selected with respect to said focal length so that said medium is located at or in the immediate vicinity of the image plane of said pinhole array.
Claim 3
Dependent Claim
85 words
The system defined in claim 1, wherein said medium has a dynamic range which saturates in response to incident wave energy at any point thereof exceeding a given value, wherein the peak intensity of wave energy at at least one point in said image plane exceeds said given value, and wherein said medium is displaced from said image plane by substantially the minimum amount required to prevent the intensity of wave energy incident on said medium from exceeding said given value at any point thereof.
Claim 4
Dependent Claim
62 words
The system defined in claim 2, wherein said distance of said medium from said principal plane is that given distance which provides a hologram of a predetermined size, and said distance from said pinhole array to said principal plane is that required to form an image plane having said displacement from said medium when said medium is located at said given distance.
Claim 5
Dependent Claim
57 words
The system defined in claim 1, wherein said distance of said medium from said given principal plane is that given distance which provides a hologram of a predetermined size, and said distance from said pinhole array to said principal plane is that required to form an image plane at or in the immediate vicinity of said medium.
References Cited (Backward Citations)
US3675983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |