Patent US3695751A successfully refreshed from Google Patents.
US3695751A
Expired / Lapsed
US
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Hemispherical motion picture screen
Assignee: Midori Kai Co Ltd
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Filing: 1970-10-26
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Granted: 1972-10-03
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Expires: 1990-10-26
Abstract
Abstract A hemispherical motion picture screen is provided with a spherical or arcuate lower extension, and the screen is comprised of a plurality of individual screen strips. The screen is in the form of a sphere which is truncated below the equator, the lower extension extending downwardly below the equator of the screen and being a continuation of the spherical shape so that dead zones in the projected image are eliminated. The spherical shape of the screen is provided by a plurality of frame units, each of which includes a plurality of generally horizontally disclosed screen strips. The screen strips are positioned in overlapping relationship with their disclosed faces directed downward.
Inventors
- 👤 Toshio Watanuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:12
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B37/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A screen for receiving projected images, the screen being formed from a plurality of frame units joined together to provide the screen with the general shape of a sphere truncated below the equator thereof to provide a generally spherical segment extending below the equator of the screen whereby dead zones in the projected images are eliminated, each frame unit including a pair of vertical members provided with sawteeth and a pair of horizontal members extending between the vertical members.
Claim 2
Dependent Claim
79 words
A screen for receiving projected images, the screen being formed from a plurality of frame units joined together to provide the screen with the general shape of a sphere truncated below the equator thereof to provide a generally spherical segment extending below the equator of the screen whereby dead zones in the projected images are eliminated, each frame unit including a pair of vertical members provided with sawteeth and a pair of horizontal members extending between the vertical members.
Claim 3
Dependent Claim
31 words
The screen of claim 1 including a plurality of elongated screen strips, each screen strip extending horizontally between the sawteeth on opposite vertical members of a frame unit in overlapping relationship.
Claim 4
Dependent Claim
87 words
An image projeCting assembly comprising an outer generally dome-shaped building providing a generally hemispherical inner wall, a screen secured to the inner wall of the building and spaced inwardly therefrom, the screen having the shape of a sphere truncated below the equator thereof to provide a spherical segment extending below the equator of the screen, and a plurality of spaced-apart projectors positioned adjacent the lower periphery of the building so that the optical axis of each projector passes generally through the geometric center of the spherical screen.
Claim 5
Dependent Claim
87 words
An image projeCting assembly comprising an outer generally dome-shaped building providing a generally hemispherical inner wall, a screen secured to the inner wall of the building and spaced inwardly therefrom, the screen having the shape of a sphere truncated below the equator thereof to provide a spherical segment extending below the equator of the screen, and a plurality of spaced-apart projectors positioned adjacent the lower periphery of the building so that the optical axis of each projector passes generally through the geometric center of the spherical screen.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |