US4208086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-dimensional projection system
Assignee: Individual
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Filing: 1976-05-28
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Granted: 1980-06-17
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Expires: 1996-05-28
Abstract
Abstract A projection system for providing a magnified image from a holographic transparency in which the transparency is illuminated from one side by a laser, and two lens are serially arranged on the other side of the transparency, the second of these lens having a focal length greater than the first one. An Arnulf afocal plate closely follows serially the second of the lens. A viewer in front of the afocal plates perceives a three-dimensional real image positioned between the viewer and the afocal plate, which image is a magnified and dimensionally correct reproduction of the image from which the hologram was originally made.
Inventors
- 👤 Lawrence M. Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:34
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/22; G03H1/2249; G03H1/2202; G03H1/2205; G03H2001/221; G03H2001/2223; G03H2001/2234; G03H2210/00; G03H2210/30; G03H2223/00; G03H2223/17
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
179 words
A projection system for providing a three-demensional image in space suitable for audience viewing comprising: imaging means for creating in a discrete first region an optically focusable virtual image, or, alternately, an object; first lens means having a first focal length f 1 , and responsive to said image in said first focal region for projecting said image in a second focal region; second lens means having a focal length f 2 , greater than the focal length of said first lens means, and responsive to the image appearing in said first focal region for projecting an enlarged image in a third focal region; and an Arnulf afocal plate positioned in optical circuit with said second lens, and comprising a plurality of positive-negative lens pairs wherein the focal length of a positive lens f 3 of a said pair is greater than the focal length of a negative lens f 4 of a said pair, and wherein f 2 /f 1 is equal to f 3 /f 4 , f 3 and f 4 having the same reference point.
Claim 2
Dependent Claim
179 words
A projection system for providing a three-demensional image in space suitable for audience viewing comprising: imaging means for creating in a discrete first region an optically focusable virtual image, or, alternately, an object; first lens means having a first focal length f 1 , and responsive to said image in said first focal region for projecting said image in a second focal region; second lens means having a focal length f 2 , greater than the focal length of said first lens means, and responsive to the image appearing in said first focal region for projecting an enlarged image in a third focal region; and an Arnulf afocal plate positioned in optical circuit with said second lens, and comprising a plurality of positive-negative lens pairs wherein the focal length of a positive lens f 3 of a said pair is greater than the focal length of a negative lens f 4 of a said pair, and wherein f 2 /f 1 is equal to f 3 /f 4 , f 3 and f 4 having the same reference point.
Claim 3
Dependent Claim
28 words
A projection system as set forth in claim 1 wherein the distance between said first lens and said second lens is equal to f 1 +f 2 .
Claim 4
Dependent Claim
20 words
A projection system as set forth in claim 2 wherein said Arnulf afocal plate is positioned adjacent said second lens.
Claim 5
Dependent Claim
31 words
A projection system as set forth in claim 2 wherein the (aperture of said second lens/aperture of said first lens) is at least as great as f 2 /f 1 .
Claim 6
Dependent Claim
23 words
A projection system as set forth in claim 2 wherein said imaging means includes a holographic transparency and laser for illuminating said transparency.
Claim 7
Dependent Claim
23 words
A projection system as set forth in claim 2 wherein the ratio of said f 2 to f 1 is greater than 1.
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) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |