US3768390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic camera with electric shutter
Assignee: Minolta Co Ltd
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Filing: 1971-07-19
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Granted: 1973-10-30
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Expires: 1991-07-19
Abstract
Abstract A photographic camera with an electric shutter, which first closes a shutter so as to detect whether the voltage of a power source battery used for an electric shutter is suitable or not to operate said electric shutter by pushing down a shutter release button and then renders said electric shutter operative or inoperative depending upon the suitability of the voltage of said power source through an electromagnetic and mechanical means.
Inventors
- 👤 T Kobori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:59
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12; G03B9/00; G03B9/58
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
228 words
In a photographic camera including a shutter control circuit having an integrating circuit, an electromagnet and a switching circuit for terminating exposure through said electromagnet after a delay period determined by said integrating circuit, and an electric power source for supplying electric power to said shutter control circuit, a shutter control release mechanism, comprising: a shutter releasing mechanism; an operating member movable between a rest position and an operating position for actuating said shutter releasing member; a control member movable between a first and a second position for respectively interconnecting and disconnecting said operating member to said shutter releasing mechanism; a permanent magnet fOr restraining said control member in said second position; a second electromagnet having a coil wound to induce a magnetic field opposed to the field of said permanent magnet; means for biasing said control member in said first position opposing the force of said permanent magnet, the forces of said permanent magnet, said second electromagnet and said biasing means being set so that said control member is released from said fwrst position to move to said second position when the current running through said coil is larger than a predetermined level; and a switch member connected between said electric power source and said coil and actuated by said operating member to energize said coil with initial movement of said operating member from said rest position.
Claim 2
Dependent Claim
228 words
In a photographic camera including a shutter control circuit having an integrating circuit, an electromagnet and a switching circuit for terminating exposure through said electromagnet after a delay period determined by said integrating circuit, and an electric power source for supplying electric power to said shutter control circuit, a shutter control release mechanism, comprising: a shutter releasing mechanism; an operating member movable between a rest position and an operating position for actuating said shutter releasing member; a control member movable between a first and a second position for respectively interconnecting and disconnecting said operating member to said shutter releasing mechanism; a permanent magnet fOr restraining said control member in said second position; a second electromagnet having a coil wound to induce a magnetic field opposed to the field of said permanent magnet; means for biasing said control member in said first position opposing the force of said permanent magnet, the forces of said permanent magnet, said second electromagnet and said biasing means being set so that said control member is released from said fwrst position to move to said second position when the current running through said coil is larger than a predetermined level; and a switch member connected between said electric power source and said coil and actuated by said operating member to energize said coil with initial movement of said operating member from said rest position.
Claim 3
Dependent Claim
81 words
A control device as set forth in claim 1, wherein said operating member includes a release rod movable from a rest position to an operating position in response to shutter releasing operation and having means for actuating said switch member and an intermediate lever pivotally mounted on the release rod, said control member includes means engageable with said intermediate member with said control member in said first position to rotate said intermediate lever for the actuation of said shutter releasing mechanism.
Claim 4
Dependent Claim
42 words
A control device as set forth in claim 2, further comprising a manual member for charging said shutter releasing mechanism, and means for carrying said control member from said second position to said first position in response to the shutter charging operation.
Claim 5
Dependent Claim
96 words
A control device as set forth in claim 1, wherein the camera is a single lens reflex camera including a movable reflex mirror and a first driving means for driving said mirror from a viewing position to a photographing position, and a second driving means for driving a diaphragm setting member from a full aperture position to a predetermined aperture position, and said shutter releasing mechanism including means for actuating said first and second driving means and subsequently releasing said shutter releasing mechanism, whereby said operating means only initiates the operation of said shutter releasing mechanism.
References Cited (Backward Citations)
US3208365A
Cited
US3435745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |