Patent US3774990A successfully refreshed from Google Patents.
US3774990A
Expired / Lapsed
US
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Visual simulation optical system
Assignee: CAE Link Corp
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Filing: 1972-09-29
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Granted: 1973-11-27
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Expires: 1992-09-29
Abstract
Abstract An optical system for distorting an image projected from a film, or the like, to produce simulated viewpoint displacement. The invention improves on the performance of conventional systems using two rotatable fixed anamorphosers in the form of cylindrical lenses by replacing the lens farthest from the film with a rotatable prism system. The latter is optically and mechanically interchangeable with the cylindrical lens which it replaces in present commercial visual systems for aircraft simulations, for example.
Inventors
- 👤 J Beck
- 👤 H Nielsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:57
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/08; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/30; G09B9/32; G09B9/326
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
An optical system providing controlled apparent viewpoint displacement in a projected image visual system for aircraft simulators, and the like, said system comprising, in combination: a. a film projector; b. an image rotator; c. a zoom-type projection lens; d. a cylindrical lens having a first magnification axis and mounted for selective rotation; e. a prism group having a second magnification axis and mounted for selective rotation relative to said first axis; f. a pair of pitch wedges; and g. a decollinating lens; h. all of said rotator, projection lens, cylindrical lens, prism group, pitch wedges and decollimating lens being mounted on, and defining the optical axis of said projector, in the order recited with said rotator being closest to said projector.
Claim 2
Dependent Claim
121 words
An optical system providing controlled apparent viewpoint displacement in a projected image visual system for aircraft simulators, and the like, said system comprising, in combination: a. a film projector; b. an image rotator; c. a zoom-type projection lens; d. a cylindrical lens having a first magnification axis and mounted for selective rotation; e. a prism group having a second magnification axis and mounted for selective rotation relative to said first axis; f. a pair of pitch wedges; and g. a decollinating lens; h. all of said rotator, projection lens, cylindrical lens, prism group, pitch wedges and decollimating lens being mounted on, and defining the optical axis of said projector, in the order recited with said rotator being closest to said projector.
Claim 3
Dependent Claim
23 words
The invention according to claim 1 wherein said prism group comprises two pairs of identical prisms rotated 180* with respect to one another.
References Cited (Backward Citations)
US3497289A
Cited
US3611590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |