US3704930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micro-holographic recording and reading apparatus
Assignee: Unisys Corp
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Filing: 1971-03-31
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Granted: 1972-12-05
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Expires: 1991-03-31
Abstract
Abstract Micro-holographic Fourier transform recorder apparatus arranged and constructed so as to provide, with suitable reader apparatus reproduced images of a sufficient size for direct viewing and compensated for aberration and laser speckle. The recorder includes means for providing an enlarged image of the transparency to be recorded prior to making the hologram whereby an enlarged image is produced on reconstruction. The appearance of laser speckle is eliminated in the reader apparatus by means of an appropriate vibratory motion applied to the diffusing screen on which the image is presented.
Inventors
- 👤 Donald H Mcmahon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:39
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
101 words
A micro-holographic recording apparatus comprising light source means including a laser for directing a light beam through a transparency containing data which is to be recorded, first light focusing meaNs positioned to collect light transmitted through the transparency and produce an enlarged image of the transparency, a holographic recording plate, second light focusing means positioned at the location of the enlarged image for converging the enlarged image onto said holographic recording plate, and means for directing a coherently related reference beam onto said holographic recording plate to interfere with the converged image light to produce a hologram of the transparency data.
Claim 2
Dependent Claim
101 words
A micro-holographic recording apparatus comprising light source means including a laser for directing a light beam through a transparency containing data which is to be recorded, first light focusing meaNs positioned to collect light transmitted through the transparency and produce an enlarged image of the transparency, a holographic recording plate, second light focusing means positioned at the location of the enlarged image for converging the enlarged image onto said holographic recording plate, and means for directing a coherently related reference beam onto said holographic recording plate to interfere with the converged image light to produce a hologram of the transparency data.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1 including means positioned in the path of the light transmitted through the transparency for blocking undiffracted light transmitted therethrough.
Claim 4
Dependent Claim
41 words
The apparatus of claim 1 wherein the enlarged image is of generally rectangular configuration and the plane of incidence of the coherently related beam on said holographic recording plate is aligned substantially parallel to the longer dimension of the enlarged image.
Claim 5
Dependent Claim
48 words
The apparatus of claim 1 wherein said second light focusing means comprises a holographic lens having a focal point equidistant from opposite edges of said holographic lens and is oriented so as to be canted with respect to the optical axis of the beam forming the enlarged image.
Claim 6
Dependent Claim
44 words
The apparatus of claim 4 including means for positioning the transparency so that it is canted with respect to the optical axis of the beam directed through the transparency so as to form the enlarged image in a plane superposed with said holographic lens.
Claim 7
Dependent Claim
28 words
The apparatus of claim 5 including means positioned in the path of the light transmitted through the transparency for blocking light which is not diffracted by the transparency.
Claim 8
Dependent Claim
40 words
The apparatus of claim 5 wherein the enlarged image is of generally rectangular configuration and the plane of incidence of the coherently related beam on said holographic recording plate is aligned parallel to the longer dimension of the enlarged image.
Claim 9
Dependent Claim
28 words
The apparatus of claim 7 including means positioned in the path of the light transmitted through the transparency for blocking light which is not diffracted by the transparency.
Claim 10
Dependent Claim
123 words
A micro-holographic recording apparatus comprising a microfilm transparency containing data to be recorded, light source means including a laser for directing a converging light beam through said transparency, first light focusing means located proximate the focal point of the converging beam for collecting the light transmitted through said transparency and producing an enlarged image thereof, second light focusing means positioned at the location of said enlarged image for converging the light contained therein, a holographic plate positioned at the focal plane of said second light focusing means for receiving said converging image light, and means for directing a coherently related reference beam onto said holographic plate to interfere therein with said converging image light to produce a hologram representative of the transparency data.
Claim 11
Dependent Claim
123 words
A micro-holographic recording apparatus comprising a microfilm transparency containing data to be recorded, light source means including a laser for directing a converging light beam through said transparency, first light focusing means located proximate the focal point of the converging beam for collecting the light transmitted through said transparency and producing an enlarged image thereof, second light focusing means positioned at the location of said enlarged image for converging the light contained therein, a holographic plate positioned at the focal plane of said second light focusing means for receiving said converging image light, and means for directing a coherently related reference beam onto said holographic plate to interfere therein with said converging image light to produce a hologram representative of the transparency data.
Claim 12
Dependent Claim
90 words
The apparatus of claim 9 wherein said second light focusing means comprises a holographic lens having a focal point equidistant from opposite edges of said holographic lens and is oriented so as to be canted with respect to the optical axis of the beam forming the enlarged image, and further including means for positioning the transparency so that it is canted with respect to the optical axis of the converging beam directed through the transparency so as to form the enlarged image in a plane superposed with said holographic lens.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |