Patent US3782813A successfully refreshed from Google Patents.
US3782813A
Expired / Lapsed
US
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Cine camera film end sensing device
Assignee: OSAWA SEIMITSU KOGYO (OSAWA PRECISION INDUSTRIES LTD) KK
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Filing: 1972-05-11
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Granted: 1974-01-01
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Expires: 1992-05-11
Abstract
Abstract An end of film sensor and indicator device is provided for a motion picture camera having a reversibly drivable film transport mechanism, and accepting film cartridges without a driven take-up and without a film anti-backwind device, the cartridge having film access openings through which film might be passed into a film guide path of the camera upon movement by the transport mechanism and returned to the cartridge, the film guide path having a film condition sensor including circuitry responsive to the presence or absence of film in the guide path for actuating an indicator which may be arranged to be visible within the viewfinder and may be energized intermittently.
Inventors
- 👤 T Isono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:08
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/43
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
192 words
In a motion picture camera selectively operable in a plurality of modes, the camera having a film transport mechanism and a film supply chamber accepting a film cartridge without a film anti-backwind device and having an aperture through which light rays defining an image can impinge on a film and having a film exit access opening through which film can be transported from said cartridge and rewound into said cartridge, a film condition sensing mechanism in said camera, comprising: film guide means cooperating with said access opening for guiding of film during transport relative to said cartridge; film detector means arranged in said film guide means for actuation by film therein; said film detector means including a lever pivotably mounted adjacent said film guide for pivotable displacement by film in said film guide; a film engaging sprocket mounted on said lever for rotation by movement of film in said film guide; an eccentric cam mounted for rotation with said sprocket; a switch mounted adjacent said cam for intermittent operation upon rotation of said cam; and an indicator lamp in circuit with said switch energizable intermittently in response to operation of said switch.
Claim 2
Dependent Claim
192 words
In a motion picture camera selectively operable in a plurality of modes, the camera having a film transport mechanism and a film supply chamber accepting a film cartridge without a film anti-backwind device and having an aperture through which light rays defining an image can impinge on a film and having a film exit access opening through which film can be transported from said cartridge and rewound into said cartridge, a film condition sensing mechanism in said camera, comprising: film guide means cooperating with said access opening for guiding of film during transport relative to said cartridge; film detector means arranged in said film guide means for actuation by film therein; said film detector means including a lever pivotably mounted adjacent said film guide for pivotable displacement by film in said film guide; a film engaging sprocket mounted on said lever for rotation by movement of film in said film guide; an eccentric cam mounted for rotation with said sprocket; a switch mounted adjacent said cam for intermittent operation upon rotation of said cam; and an indicator lamp in circuit with said switch energizable intermittently in response to operation of said switch.
Claim 3
Dependent Claim
42 words
The mechanism as in claim 1 wherein said film guide means is a partially enclosed path extending between said film exit access opening of said cartridge and a film entrance access opening in said cartridge spaced from said film exit access opening.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |