US3838436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opening device for an electronic shutter
Assignee: Seiko Koki KK
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Filing: 1973-05-29
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Granted: 1974-09-24
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Expires: 1993-05-29
Abstract
Abstract A camera having an electronic shutter has an opening device for opening the shutter and a closing device for closing the shutter after the elapse of a predetermined time to effect an exposure. The opening device comprises a rotatable wheel having a gear connected thereto, a pivotable gear sector in mesh with the gear, a turnable opening lever in camming contact with the gear sector, and a spring system biasing the opening lever in such a manner to obtain opening of the shutter at a predetermined opening speed. The spring system consists of a first biasing spring cooperating with the wheel and acting through the gear and gear sector to bias the opening lever in a direction to oppose the shutter opening and a second biasing spring urges the opening lever in a direction to effect opening of the shutter with a force greater than that exerted by the first biasing spring to obtain opening of the shutter at the predetermined opening speed.
Inventors
- 👤 M Ogihara
- 👤 M Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:04
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083; G03B9/00; G03B9/58
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
207 words
In a camera having an electric shutter movable from a closed state to an open state and back to said closed state to effect an exposure: opening means for opening said shutter at a predetermined opening speed to initiate an exposure comprising a turnable lever having one position corresponding to that wherein said shutter is closed and turnable in one direction from said one position to effect opening of said shutter, means for releasably locking said turnable lever in said one position, first biasing means biasing said turnable lever in said one direction with a first biasing force sufficient to effect turning of said turnable lever in said one direction when said turning lever is unlocked to thereby effect opening of said shutter, and delay means including second biasing means continuously biasing said turnable lever in a direction opposite to said one direction throughout the opening of said shutter with a second biasing force weaker than said first biasing force to oppose the opening of said shutter for mechanically delaying the turning of said turnable lever in said one direction with a preselected time delay to effect opening of said shutter at a predetermined opening speed; and closing means for closing said shutter to complete said exposure.
Claim 2
Dependent Claim
207 words
In a camera having an electric shutter movable from a closed state to an open state and back to said closed state to effect an exposure: opening means for opening said shutter at a predetermined opening speed to initiate an exposure comprising a turnable lever having one position corresponding to that wherein said shutter is closed and turnable in one direction from said one position to effect opening of said shutter, means for releasably locking said turnable lever in said one position, first biasing means biasing said turnable lever in said one direction with a first biasing force sufficient to effect turning of said turnable lever in said one direction when said turning lever is unlocked to thereby effect opening of said shutter, and delay means including second biasing means continuously biasing said turnable lever in a direction opposite to said one direction throughout the opening of said shutter with a second biasing force weaker than said first biasing force to oppose the opening of said shutter for mechanically delaying the turning of said turnable lever in said one direction with a preselected time delay to effect opening of said shutter at a predetermined opening speed; and closing means for closing said shutter to complete said exposure.
Claim 3
Dependent Claim
122 words
A camera according to claim 1; wherein said delay means comprises a rotatable toothed gear, a pivotable gear sector having a toothed portion in mesh with said toothed gear and a cam portion, a pivotable opening lever having one arm in camming contact with said cam portion and another arm in camming contact with said turnable lever, and wherein said second biasing means comprises means for biasing said toothed gear in one rotational direction to apply said second biasing force through said gear sector and said opening lever to said turnable lever whereby said first biasing force effects pivotal movement of said opening lever and said gear sector and rotation of said gear against the opposing action of said second biasing force.
Claim 4
Dependent Claim
47 words
A camera according to claim 2; wherein said delay means includes a rotatable wheel connected for rotation with said toothed gear and having a preselected mass effective to offer inertial resistance to rotation of said wheel to obtain opening of said shutter at said predetermined opening speed.
Claim 5
Dependent Claim
29 words
A camera according to claim 3; wherein said second biasing means comprises a biasing spring coacting with said wheel for biasing said toothed gear in said one rotational direction.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |