US3715964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens shutter control mechanism for a single lens reflex camera
Assignee: Minolta Co Ltd
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Filing: 1970-09-17
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Granted: 1973-02-13
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Expires: 1990-09-17
Abstract
Abstract A lens shutter control mechanism includes an operating member movable between a first and second cocked position in accordance with the actuation of an electromagnetic means whereby a shutter blade member is respectively opened and closed with said operating member respectively in said first and second cocked position. A latch member actuated by the electromagnetic means retains the operating member in the second cocked position. The actuation of the electromagnetic means is determined by the operation of two switches which are operated in accordance with the movement of a mirror between a viewing position and a picture taking position.
Inventors
- 👤 S Tenkumo
- 👤 T Egawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:39
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
289 words
A lens shutter control mechanism for a single lens reflex camera having a lens shutter, comprising: a mirror movable between a viewing position and a picture taking position; a light shield movable between a first position for blocking light to a film and a second position where light is passed to the film; a first switch; a second switch closed with said light shield in said first position; an electric power source; means for opening said first switch with said mirror in said viewing position and for closing said first switch with the initiation of movement of said mirror from said viewing position to said picture taking position; means for opening said second switch at the termination of movement of said light shield to said second position; a lens shutter including shutter blade members movable between a blade opened position and a blade closed position; a control means for controlling said shutter blade members to establish a time film exposure interval; an operating member movable between a first cocked position for retaining said shutter blade members in said blade opened position and a second cocked position for allowing said shutter blade members to be in said blade closed position, and further movable to a position for actuating said control means, a latch member for retaining said operating member in said second cocked position, and an electromagnetic means serially connected to said first and second switches for releasing said operating member from said first cocked position and simultaneously moving said latch member to engage with said operating member with said first switch closed, and releasing said operating member from said second cocked position to allow movement thereof to said position for actuating said control means with said second switch opened.
Claim 2
Dependent Claim
289 words
A lens shutter control mechanism for a single lens reflex camera having a lens shutter, comprising: a mirror movable between a viewing position and a picture taking position; a light shield movable between a first position for blocking light to a film and a second position where light is passed to the film; a first switch; a second switch closed with said light shield in said first position; an electric power source; means for opening said first switch with said mirror in said viewing position and for closing said first switch with the initiation of movement of said mirror from said viewing position to said picture taking position; means for opening said second switch at the termination of movement of said light shield to said second position; a lens shutter including shutter blade members movable between a blade opened position and a blade closed position; a control means for controlling said shutter blade members to establish a time film exposure interval; an operating member movable between a first cocked position for retaining said shutter blade members in said blade opened position and a second cocked position for allowing said shutter blade members to be in said blade closed position, and further movable to a position for actuating said control means, a latch member for retaining said operating member in said second cocked position, and an electromagnetic means serially connected to said first and second switches for releasing said operating member from said first cocked position and simultaneously moving said latch member to engage with said operating member with said first switch closed, and releasing said operating member from said second cocked position to allow movement thereof to said position for actuating said control means with said second switch opened.
Claim 3
Dependent Claim
289 words
A lens shutter control mechanism for a single lens reflex camera having a lens shutter, comprising: a mirror movable between a viewing position and a picture taking position; a light shield movable between a first position for blocking light to a film and a second position where light is passed to the film; a first switch; a second switch closed with said light shield in said first position; an electric power source; means for opening said first switch with said mirror in said viewing position and for closing said first switch with the initiation of movement of said mirror from said viewing position to said picture taking position; means for opening said second switch at the termination of movement of said light shield to said second position; a lens shutter including shutter blade members movable between a blade opened position and a blade closed position; a control means for controlling said shutter blade members to establish a time film exposure interval; an operating member movable between a first cocked position for retaining said shutter blade members in said blade opened position and a second cocked position for allowing said shutter blade members to be in said blade closed position, and further movable to a position for actuating said control means, a latch member for retaining said operating member in said second cocked position, and an electromagnetic means serially connected to said first and second switches for releasing said operating member from said first cocked position and simultaneously moving said latch member to engage with said operating member with said first switch closed, and releasing said operating member from said second cocked position to allow movement thereof to said position for actuating said control means with said second switch opened.
Claim 4
Dependent Claim
289 words
A lens shutter control mechanism for a single lens reflex camera having a lens shutter, comprising: a mirror movable between a viewing position and a picture taking position; a light shield movable between a first position for blocking light to a film and a second position where light is passed to the film; a first switch; a second switch closed with said light shield in said first position; an electric power source; means for opening said first switch with said mirror in said viewing position and for closing said first switch with the initiation of movement of said mirror from said viewing position to said picture taking position; means for opening said second switch at the termination of movement of said light shield to said second position; a lens shutter including shutter blade members movable between a blade opened position and a blade closed position; a control means for controlling said shutter blade members to establish a time film exposure interval; an operating member movable between a first cocked position for retaining said shutter blade members in said blade opened position and a second cocked position for allowing said shutter blade members to be in said blade closed position, and further movable to a position for actuating said control means, a latch member for retaining said operating member in said second cocked position, and an electromagnetic means serially connected to said first and second switches for releasing said operating member from said first cocked position and simultaneously moving said latch member to engage with said operating member with said first switch closed, and releasing said operating member from said second cocked position to allow movement thereof to said position for actuating said control means with said second switch opened.
Claim 5
Dependent Claim
27 words
A lens shutter control mechanism as set forth in claim 1, wherein said second switch is opened with said light shield fully opened in said second position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |