US3756684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coarse pinhole array for recording improved redundant holograms
Assignee: RCA Corp
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Filing: 1971-12-09
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Granted: 1973-09-04
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Expires: 1991-12-09
Abstract
Abstract The use of a redundancy means including a pinhole array having a ratio of the distance between adjacent pinholes to the maximum linear dimension of a pinhole of at least 30 not only provides high effective redundancy, but the spatial signal-to-noise ratio in the reconstructed image of a recorded hologram recorded with such a pinhole array and played back with coherent wave energy is significantly higher than heretofore obtainable, particularly when less than ideal optic elements are employed in the recording system.
Inventors
- 👤 E Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:42
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/32
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
120 words
In a system for recording a redundant hologram of an object on a given area of a recording medium with mutually coherent reference and information beams of wave energy of a given wavelength lambda , said system comprising illuminating means including a pinhole array in spaced relation with said object for illuminating said object through said pinhole array with coherent wave energy of said given wavelength lambda to provide said information beam; the improvement therein wherein said array has substantially identical pinholes arranged in a predetermined periodic pattern with minimum spacing d between any pair of adjacent pinholes, each of said pinholes having a maximum linear dimension a, the ratio of d/a being in the range of 50 to 1,000.
Claim 2
Dependent Claim
120 words
In a system for recording a redundant hologram of an object on a given area of a recording medium with mutually coherent reference and information beams of wave energy of a given wavelength lambda , said system comprising illuminating means including a pinhole array in spaced relation with said object for illuminating said object through said pinhole array with coherent wave energy of said given wavelength lambda to provide said information beam; the improvement therein wherein said array has substantially identical pinholes arranged in a predetermined periodic pattern with minimum spacing d between any pair of adjacent pinholes, each of said pinholes having a maximum linear dimension a, the ratio of d/a being in the range of 50 to 1,000.
Claim 3
Dependent Claim
54 words
The system defined in claim 1, wherein said illuminating means further comprises a lens array corresponding to said pinhole array with said pinhole array being situated for the focal plane of said lens array with the focal point of each respective lens thereof being positioned substantially in th center of the pinhole corresponding thereto.
Claim 4
Dependent Claim
15 words
The system defined in claim 2, wherein said lens array is a Fresnel lens array.
Claim 5
Dependent Claim
16 words
The system defined in claim 1, wherein the ratio d2/ lambda is at least 25 centimeters.
Claim 6
Dependent Claim
20 words
The system defined in claim 1, wherein the ratio d2/ lambda is in the order of 1 meter or more.
Claim 7
Dependent Claim
59 words
The system defined in claim 1, wherein said object is located in a given image plane of said pinhole array characterized in that said image consists of an array of effective wave energy sources arranged in said predetermined periodic pattern with substantially the same given spacing d/m, where m is a plural integer, between any pair of adjacent sources.
Claim 8
Dependent Claim
19 words
The system defined in claim 6, wherein said periodic pattern is a square and m is an even integer.
Claim 9
Dependent Claim
20 words
The system defined in claim 7, wherein d2/ lambda is at least 25 centimeters and m is at least 10.
Claim 10
Dependent Claim
24 words
The system defined in claim 7, wherein d2/ lambda is in the order of 1 meter or more and m is at least 30.
Claim 11
Dependent Claim
45 words
The system defined in claim 6, wherein said polygon is a regular hexagon, and wherein said given image plane is such that the angular orientation of the hexagon of said source array is substantialy the same as that of said hexagon of said pinhole array.
Claim 12
Dependent Claim
20 words
The system defined in claim 10, wherein d2/ lambda is at least 25 centimeters and m is at least 10.
Claim 13
Dependent Claim
24 words
The system defined in claim 10, wherein d2/ lambda is in the order of 1 meter or more and m is at least 30.
Claim 14
Dependent Claim
61 words
The system defined in claim 6, wherein each source of a certain set of said array of sources samples a separate portion of said object, and wherein the relative phase of the wave energy of each source of said array is such that the vector sum of the wave energy from all sources adjacent any one source has a minimum amplitude.
Claim 15
Dependent Claim
13 words
The system defined in claim 13, wherein said minimum amplitude is substantially zero.
Claim 16
Dependent Claim
74 words
The system defined in claim 6, wherein each source of a certain set of said array of sources sample a separate portion of said object, and wherein the relative phase of the wave energy of each source of said array is such that the vector sum of the wave energy from all sources adjacent any one source of said set has a phase which is substantially in quadrature with that of said one source.
Claim 17
Dependent Claim
12 words
The system defined in claim 1, wherein said wave energy is light.
Claim 18
Dependent Claim
20 words
The system defined in claim 16, wherein lambda is less than 500 nanometers and d is at least 500 micrometers.
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |