US3581633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera shutter
Assignee: Pentax Corp
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Filing: 1968-09-26
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Granted: 1971-06-01
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Expires: 1988-09-26
Abstract
Abstract An electrically timed camera shutter includes a timing and switching network connected to an energizing battery through a pair of parallel normally open first and second switches. The first switch is closed by the shutter opening release button which also unlatches a spring actuated lever which closes the second switch. The lever is retracted with the initiation of the shutter closing to open the second switch. The network energizes and deenergizes a solenoid for holding open and releasing the shutter to its closed position and in an alternative arrangement instead of a lever, a solenoid energized by the network output controls the second switch.
Inventors
- 👤 Naoyuki Uno
- 👤 Katsuhiko Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:52
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
172 words
In a camera including shutter means successively movable to open and closed positions, defining an exposure interval, a control network including a timing circuit and a switch circuit having an input coupled to said timing circuit and an exposure terminating means responsive to the output of said switch circuit for effecting the closure of said shutter, a current source for energizing said network, a pair of parallel normally open first and second switches connected between said current source and said control network, a shutter release member movable between advanced and retracted positions, retention means movable to an advanced position to close and releasably maintain said second switch in a closed condition and to a retracted position, means responsive to the advance of said shutter release member for closing said first switch and actuating said retention means to close said second switch and thereafter initiating the opening of said shutter, and means for returning said retention means to a position opening said second switch following the initiation of the closing of said shutter.
Claim 2
Dependent Claim
172 words
In a camera including shutter means successively movable to open and closed positions, defining an exposure interval, a control network including a timing circuit and a switch circuit having an input coupled to said timing circuit and an exposure terminating means responsive to the output of said switch circuit for effecting the closure of said shutter, a current source for energizing said network, a pair of parallel normally open first and second switches connected between said current source and said control network, a shutter release member movable between advanced and retracted positions, retention means movable to an advanced position to close and releasably maintain said second switch in a closed condition and to a retracted position, means responsive to the advance of said shutter release member for closing said first switch and actuating said retention means to close said second switch and thereafter initiating the opening of said shutter, and means for returning said retention means to a position opening said second switch following the initiation of the closing of said shutter.
Claim 3
Dependent Claim
46 words
The camera of claim 1, said switching means including a switch closing member spring urged toward an advancing position urging said second switch to a closed position, and means responsive to said shutter release member for releasably latching said switch closing member in a retracted position.
Claim 4
Dependent Claim
25 words
The camera of claim 2 including means responsive to the closing of said shutter for retracting said switch closing member to a latched retracted position.
Claim 5
Dependent Claim
20 words
The camera of claim 1 wherein said exposure terminating means includes a solenoid connected to the output of said network.
Claim 6
Dependent Claim
15 words
The camera of claim 1 wherein said timing circuit includes a resistor and a capacitor.
Claim 7
Dependent Claim
32 words
The camera of claim 1, wherein said timing circuit includes a resistor and a capacitor, and including a normally closed switch shunting said capacitor and opened with the opening of said shutter.
Claim 8
Dependent Claim
11 words
The camera of claim 6, wherein said resistor comprises a photoconductor.
Claim 9
Dependent Claim
127 words
In a camera including shutter means successively movable to open and closed positions, defining an exposure interval, a control network including a timing circuit and a switch circuit having an input coupled to said timing circuit and an exposure terminating means responsive to the output of said switch circuit for effectiNg the closure of said shutter, a current source for energizing said network, a pair of parallel first and second switches connected between said current source and said network, said first switch being actuatable in response to the position of said shutter release member, and means responsive to said circuit output for actuating and maintaining said second switch in a closed position and for opening said second switch upon the initiation of the closing of said shutter.
Claim 10
Dependent Claim
127 words
In a camera including shutter means successively movable to open and closed positions, defining an exposure interval, a control network including a timing circuit and a switch circuit having an input coupled to said timing circuit and an exposure terminating means responsive to the output of said switch circuit for effectiNg the closure of said shutter, a current source for energizing said network, a pair of parallel first and second switches connected between said current source and said network, said first switch being actuatable in response to the position of said shutter release member, and means responsive to said circuit output for actuating and maintaining said second switch in a closed position and for opening said second switch upon the initiation of the closing of said shutter.
Claim 11
Dependent Claim
23 words
The camera of claim 8 including a solenoid connected to the output of said network said second switch being actuated by said solenoid.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |