US3825940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focal plane shutter
Assignee: Nidec Precision Corp
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Filing: 1972-10-03
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Granted: 1974-07-23
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Expires: 1992-10-03
Abstract
Abstract A focal plane shutter having a shutter blade closing actuating member actuated by a release interlocking plate moved in association with the shutter release operation is disclosed. The closing actuating member is actuated through a release actuating lever, whose positional condition is controlled by a high-speed control cam capable of adjustment only by manual operation. The shutter may be adjusted at the time of its manufacture such as to exactly provide an intended exposure time.
Inventors
- 👤 T Hayami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:03
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
270 words
A focal plane shutter comprising a base plate having an exposure aperture, opening and closing actuating members individually pivoted to said base plate, separate springs biasing said opening and closing actuating members, respectively, an opening release lever pivoted to said base plate and arranged so as to lock said opening actuating member when said opening actuating member is brought to a cocked position, a closing release lever pivoted to said base plate and arranged so as to lock said closing actuating member when said closing actuating member is brought to a cocked position, a release interlocking plate arranged so as to be shifted to a cocked position in cooperation with the cocking operation of said opening and closing actuating members, a spring biasing said release interlocking plate, a closing release actuating lever operatively related to said release interlocking plate and having a cam portion thereon for engaging said closing release lever, a closing control lever pivoted to said base plate and pivotably supporting said closing release actuating lever on one arm thereof, said closing control lever being capable of moving the pivot of said closing release actuating lever to control the time of engagement of said cam portion of said closing release actuating lever and said closing release lever, and a manually operable high-speed control cam rotatably supported on said base plate and engaged with another arm of said closing control lever, wherein at the time of shifting said release interlocking plate by the shutter release operation said release interlocking plate first actuates said opening release lever and then causes said release actuating lever to actuate said closing release lever.
Claim 2
Dependent Claim
270 words
A focal plane shutter comprising a base plate having an exposure aperture, opening and closing actuating members individually pivoted to said base plate, separate springs biasing said opening and closing actuating members, respectively, an opening release lever pivoted to said base plate and arranged so as to lock said opening actuating member when said opening actuating member is brought to a cocked position, a closing release lever pivoted to said base plate and arranged so as to lock said closing actuating member when said closing actuating member is brought to a cocked position, a release interlocking plate arranged so as to be shifted to a cocked position in cooperation with the cocking operation of said opening and closing actuating members, a spring biasing said release interlocking plate, a closing release actuating lever operatively related to said release interlocking plate and having a cam portion thereon for engaging said closing release lever, a closing control lever pivoted to said base plate and pivotably supporting said closing release actuating lever on one arm thereof, said closing control lever being capable of moving the pivot of said closing release actuating lever to control the time of engagement of said cam portion of said closing release actuating lever and said closing release lever, and a manually operable high-speed control cam rotatably supported on said base plate and engaged with another arm of said closing control lever, wherein at the time of shifting said release interlocking plate by the shutter release operation said release interlocking plate first actuates said opening release lever and then causes said release actuating lever to actuate said closing release lever.
References Cited (Backward Citations)
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US2975689A
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US3078776A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |