US3583808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical means for audio-visual device
Assignee: Glass Marvin and Associates
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Filing: 1969-05-26
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Granted: 1971-06-08
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Expires: 1989-05-26
Abstract
Abstract An optical system for use in an audio-visual device to be used for viewing stereoscopic photographic transparencies. External light is gathered into the housing for the device by a Fresnel lens and passed through a translucent record to the pair of transparencies being viewed. Axially aligned with the transparencies being viewed are a pair of eyepieces containing double convex magnifying lenses.
Inventors
- 👤 Marvin I Glass
- 👤 Gunars Licitis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:13
CPC Classifications
G; G03; G03B; G03B31/00; G03B31/06; G02; G02B; G02B30/00; G02B30/20; G02B30/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
181 words
In an audio-visual device for stereoscopic viewing of pairs of photographic transparencies and for reproducing accompanying sounds, said device including a housing adapted to receive a removable transparency-carrying disc having a plurality of circumferentially arranged pairs of transparencies mounted therein and having a translucent sound record rotatably mounted on said disc in overlying relation to the transparencies, and means in said housing operable to reproduce the sound recorded on said record, the improvement comprising optical means in said housing affording the viewing of a selected pair of said pairs of transparencies, said optical means comprising light gathering lens means on the forward wall of the housing, a pair of viewing lenses disposed in spaced-apart relation adjacent the rear wall of the housing in position to be looked through by the eyes of a viewer, and light diffusing means disposed within said housing intermediate said viewing lenses and said light gathering lens and in a position such that wheN said disc is inserted in said housing the record portion is forward of said diffusing means and the photographic transparencies are rearward thereof.
Claim 2
Dependent Claim
181 words
In an audio-visual device for stereoscopic viewing of pairs of photographic transparencies and for reproducing accompanying sounds, said device including a housing adapted to receive a removable transparency-carrying disc having a plurality of circumferentially arranged pairs of transparencies mounted therein and having a translucent sound record rotatably mounted on said disc in overlying relation to the transparencies, and means in said housing operable to reproduce the sound recorded on said record, the improvement comprising optical means in said housing affording the viewing of a selected pair of said pairs of transparencies, said optical means comprising light gathering lens means on the forward wall of the housing, a pair of viewing lenses disposed in spaced-apart relation adjacent the rear wall of the housing in position to be looked through by the eyes of a viewer, and light diffusing means disposed within said housing intermediate said viewing lenses and said light gathering lens and in a position such that wheN said disc is inserted in said housing the record portion is forward of said diffusing means and the photographic transparencies are rearward thereof.
Claim 3
Dependent Claim
33 words
Optical means for an audio-visual device as set forth in claim 1, wherein said light gathering lens means comprises a pair of circular Fresnel lenses disposed side-by-side and coaxial with said viewing lenses.
Claim 4
Dependent Claim
20 words
Optical means for an audio-visual device as set forth in claim 2, wherein said viewing lenses are double convex lenses.
Claim 5
Dependent Claim
63 words
Optical means for an audio-visual device as set forth in claim 1, wherein said light diffusing means is disposed between said translucent record and the pair of transparencies positioned on the axes of said light gathering lens means and said viewing lens, and the focal length of said light gathering lens is substantially equal to the distance from said lens to said transparencies.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |