US3644012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording microholograms of magnified virtual images
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1970-10-16
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Granted: 1972-02-22
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Expires: 1990-10-16
Abstract
Abstract A microhologram of a magnified virtual image of the object is recorded. This is accomplished by a lens interposed between the object and the hologram. The object is positioned in a plane spaced from the front focal plane of the lens by a distance which determines the desired magnification. The hologram itself is disposed approximately in the rear focal plane of the lens. The hologram is reproduced by the conjugate reference beam of the one that was used for recording it. This will generate a magnified real image which may be projected on a screen. By means of a lens, the image may be directed in a desired direction. However, no lens is required for viewing the magnified reproduced object.
Inventors
- 👤 Robert E Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:57
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/02; G03H1/0236; G03H1/0402; G03H2001/0428; G03H1/22; G03H1/2202; G03H1/2205; G03H2001/221; G03H2001/2213; G03H2001/2215; G03H2001/2218; G03H2210/00; G03H2210/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
Apparatus for recording microholograms comprising: a. a source of monochromatic, coherent light; b. means for splitting said monochromatic light into a recording reference beam and a scene beam; c. a light-responsive recording medium disposed in a predetermined plane; d. means for directing said recording reference beam toward said plane; e. means for directing said scene beam toward said plane; and f. a lens disposed in the path of said scene beam, said lens having a rear focal plane and a front focal plane whereby an object may be disposed between said lens and said front focal plane for recording on said medium a hologram of a magnified virtual image of the object, and said medium being disposed approximately at said rear focal plane for efficient transfer of light containing the low spatial frequencies of the object.
Claim 2
Dependent Claim
136 words
Apparatus for recording microholograms comprising: a. a source of monochromatic, coherent light; b. means for splitting said monochromatic light into a recording reference beam and a scene beam; c. a light-responsive recording medium disposed in a predetermined plane; d. means for directing said recording reference beam toward said plane; e. means for directing said scene beam toward said plane; and f. a lens disposed in the path of said scene beam, said lens having a rear focal plane and a front focal plane whereby an object may be disposed between said lens and said front focal plane for recording on said medium a hologram of a magnified virtual image of the object, and said medium being disposed approximately at said rear focal plane for efficient transfer of light containing the low spatial frequencies of the object.
Claim 3
Dependent Claim
12 words
Apparatus as defined in claim 1 wherein the object is a transparency.
Claim 4
Dependent Claim
13 words
Apparatus as defined in claim 2 wherein the transparency is a 16-millimeter film.
Claim 5
Dependent Claim
37 words
Apparatus as defined in claim 1 wherein the distance between the plane of the object and said front focal plane is f/M, where f is the focal length of said lens and M is the desired magnification.
References Cited (Backward Citations)
US3514176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |