Patent US3728952A successfully refreshed from Google Patents.
US3728952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling shutter release operation in photographic cameras
Assignee: Canon Inc
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Filing: 1971-12-23
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Granted: 1973-04-24
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Expires: 1991-12-23
Abstract
Abstract A device for controlling shutter release operation in photographic cameras comprises a connecting member connected to a camera''s shutter release member to effect shutter release operation. The connecting member and an operable starting member are connected together by an intermediate connecting member capable of releasably establishing a mechanical connection by means of an electromagnetic member. The intermediate connecting member is engaged and disengaged under control of time limit means adapted to carry out a predetermined time limit action.
Inventors
- 👤 T Kiyohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:10
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/58
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
214 words
A device for controlling shutter release operation operatively connected to a shutter release member of a photographic camera, comprising: a starting member operable and movable for shutter release; a connecting member operatively connected to said shutter release member of the camera; a resilient member secured to said connecting member to impart thereto a resilient pressure in its return direction; drive transmission means including connecting means for operatively connecting said starting member and said connecting member, said connecting means comprising switching means for interrupting the operative connection between said starting member and said connecting member and further comprising a group of acceleration gears and a group of deceleration gears, said group of acceleration gears being operatively connected to said starting member and said group of deceleration gears being connected to said connecting member for said shutter release member; and time limit means adapted to start its time limit action upon actuation of said starting member so as to effect the time limit action for a predetermined time, said time limit means being connected to said switching means to release the operative connection of said connecting means through said switching means upon completion of the time limit action of said time limit means, thereby returning said connecting member for the release member to its initial position.
Claim 2
Independent Claim
214 words
A device for controlling shutter release operation operatively connected to a shutter release member of a photographic camera, comprising: a starting member operable and movable for shutter release; a connecting member operatively connected to said shutter release member of the camera; a resilient member secured to said connecting member to impart thereto a resilient pressure in its return direction; drive transmission means including connecting means for operatively connecting said starting member and said connecting member, said connecting means comprising switching means for interrupting the operative connection between said starting member and said connecting member and further comprising a group of acceleration gears and a group of deceleration gears, said group of acceleration gears being operatively connected to said starting member and said group of deceleration gears being connected to said connecting member for said shutter release member; and time limit means adapted to start its time limit action upon actuation of said starting member so as to effect the time limit action for a predetermined time, said time limit means being connected to said switching means to release the operative connection of said connecting means through said switching means upon completion of the time limit action of said time limit means, thereby returning said connecting member for the release member to its initial position.
Claim 3
Dependent Claim
56 words
A device according to claim 1 wherein said connecting means further comprises at least a one-way drive transmission member engaged with at least one of said gears adapted to rotate it in one Direction and to transmit only the force of said starting member in its actuating direction to said connecting member for said release member.
Claim 4
Dependent Claim
83 words
A device according to claim 1, wherein said time limit means comprises an electronic time limit circuit and an electromagnetic member connected with the output of said circuit, and said switching means comprises a connecting gear for operatively connecting said group acceleration gears and said group of deceleration gears, and a member for carrying said connecting gear, said carrying member being connected to said electromagnetic member to establish and release engagement of said connecting gear upon energization and deenergization of said electromagnetic member.
Claim 5
Dependent Claim
80 words
A device according to claim 2, wherein said time limit means comprises an electronic time limit circuit and an electromagnetic member connected with the output of said circuit, and said one-way drive transmission member is connected to the actuator of said electromagnetic member so as to be deactivated by said electromagnetic member after a limited time means, thereby allowing said connecting member for the release member to be returned to its initial position by the force of said resilient member.
Claim 6
Dependent Claim
63 words
A device according to claim 4, wherein said connecting means comprises a group of acceleration gears and a group of deceleration gears, said group of acceleration gears being operatively connected to said starting member said group of deceleration gears being operatively connected to said connecting member for the shutter release member, said two groups of gears being provided with one-way transmission members respectively.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |