US3927416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter for cameras
Assignee: Nidec Precision Corp
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Filing: 1974-05-03
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Granted: 1975-12-16
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Expires: 1994-05-03
Abstract
Abstract An electronic shutter for cameras comprising a control lever actuated by a shutter release, a signaling lever moved by the actuated control lever, and a mechanical exposure control lever adapted to function so that, when said signaling lever is put into motion, this exposure control lever moves due to its own habitude to the position of locking a magnet lever, so that, whenever the voltage of the battery has dropped below a given level and when accordingly the automatic exposure control circuitry has ceased to work, an exposure can be carried out without a fail and with accuracy at a given specific shutter speed selected already in designing this shutter.
Inventors
- 👤 Nobuyoshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:50
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
337 words
An electronic shutter for cameras comprising: a control lever adapted to be relieved of its locked state by a shutter release operation, a front blade release lever engageable with said control lever and rotated by the motion of said control lever, a front blade driving lever engageable with said front blade release lever and released by the motion of said front blade release lever, a holding lever engageable with said control lever and rotated by the motion of said control lever; a magnet lever engageable with said holding lever and rotatable by following the rotation of said holding lever, an electromagnet positioned adjacent to said magnet lever and capable of attracting said magnet lever thereto, a rear blade release lever engageable with said magnet lever and rotated by said magnet lever in the final stage of motion of this magnet lever, a rear blade driving lever engageable with said rear blade release lever and released by the motion of said rear blade release lever, a signaling lever engageable with said control lever and pivotable by the motion of said control lever, to indicate that the exposure time has been mechanically controlled, a lever engageable with said signaling lever and with said magnet lever, to lock said signaling lever in its pivoted position, a mechanical exposure control lever urged to engage with said signaling lever and capable of entering in the path of motion of said magnet lever, and a release lever engageable with said front blade driving lever and with said mechanical exposure control lever, said shutter being arranged so that only when said magnet lever is not attracted to said electromagnet at the time of a shutter release, said magnet lever is locked by said mechanical exposure control lever and at the same time said signaling lever is locked by said signal lever locking lever in its pivoted position, whereby the state of locking of said magnet lever and said signaling lever is released when said mechanical exposure control lever is moved by said release lever.
Claim 2
Dependent Claim
337 words
An electronic shutter for cameras comprising: a control lever adapted to be relieved of its locked state by a shutter release operation, a front blade release lever engageable with said control lever and rotated by the motion of said control lever, a front blade driving lever engageable with said front blade release lever and released by the motion of said front blade release lever, a holding lever engageable with said control lever and rotated by the motion of said control lever; a magnet lever engageable with said holding lever and rotatable by following the rotation of said holding lever, an electromagnet positioned adjacent to said magnet lever and capable of attracting said magnet lever thereto, a rear blade release lever engageable with said magnet lever and rotated by said magnet lever in the final stage of motion of this magnet lever, a rear blade driving lever engageable with said rear blade release lever and released by the motion of said rear blade release lever, a signaling lever engageable with said control lever and pivotable by the motion of said control lever, to indicate that the exposure time has been mechanically controlled, a lever engageable with said signaling lever and with said magnet lever, to lock said signaling lever in its pivoted position, a mechanical exposure control lever urged to engage with said signaling lever and capable of entering in the path of motion of said magnet lever, and a release lever engageable with said front blade driving lever and with said mechanical exposure control lever, said shutter being arranged so that only when said magnet lever is not attracted to said electromagnet at the time of a shutter release, said magnet lever is locked by said mechanical exposure control lever and at the same time said signaling lever is locked by said signal lever locking lever in its pivoted position, whereby the state of locking of said magnet lever and said signaling lever is released when said mechanical exposure control lever is moved by said release lever.
References Cited (Backward Citations)
US3670635A
Cited
US3777646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |