Patent US3646869A successfully refreshed from Google Patents.
US3646869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic shutter for photographic cameras
Assignee: Koparu KK
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Filing: 1970-02-03
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Granted: 1972-03-07
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Expires: 1990-02-03
Abstract
Abstract A shuttering opening control lever has a permanent magnet which is attracted to an electromagnet when the electromagnet is deenergized. A shutter closing control member is attracted to the electromagnet when the electromagnet is energized, and the repelling force between the electromagnet and the permanent magnet actuates the shutter opening control lever to effect opening of the shutter. Upon deenergization of the electromagnet the shutter closing control lever, which has until then been attracted to the electromagnet, moves away from the latter and effects closing of the shutter.
Inventors
- 👤 Kiyoyuki Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:34
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
An electronic shutter for photographic cameras having an electromagnet control of its actuation time by an electronic circuit, said shutter comprising first spring means for opening the shutter; operating means movable from its cocked position by said first spring means for effecting the opening of the shutter; first control means having a permanent magnet, and disposed adjacent to said electromagnet so as to be attracted thereto by the magnetic force of said permanent magnet for locking said operating means in its cocked position when said electromagnet is in the deenergized state, and to be moved away from said electromagnet by the repelling force generated between said electromagnet and said permanent magnet for releasing said operating means from its cocked position when said electromagnet is energized; second spring means for closing the shutter; and second control means having a pole-contacting portion, and disposed adjacent to said electromagnet so as to be attracted thereto when said electromagnet is in the energized state, and to be moved away from said electromagnet for effecting the closing of the shutter when said electromagnetic is deenergized.
Claim 2
Dependent Claim
180 words
An electronic shutter for photographic cameras having an electromagnet control of its actuation time by an electronic circuit, said shutter comprising first spring means for opening the shutter; operating means movable from its cocked position by said first spring means for effecting the opening of the shutter; first control means having a permanent magnet, and disposed adjacent to said electromagnet so as to be attracted thereto by the magnetic force of said permanent magnet for locking said operating means in its cocked position when said electromagnet is in the deenergized state, and to be moved away from said electromagnet by the repelling force generated between said electromagnet and said permanent magnet for releasing said operating means from its cocked position when said electromagnet is energized; second spring means for closing the shutter; and second control means having a pole-contacting portion, and disposed adjacent to said electromagnet so as to be attracted thereto when said electromagnet is in the energized state, and to be moved away from said electromagnet for effecting the closing of the shutter when said electromagnetic is deenergized.
Claim 3
Dependent Claim
76 words
An electronic shutter according to claim 1, in which said operating means comprises an operating ring rotatable about the exposure aperture from its cocked position to its stationary position by said first spring means; and an operating lever having first engaging portion for engaging said second control means, and having second engaging portion for engaging a shutter blade operating member, and pivotably attached to said operating ring for closing the shutter when said electromagnet is deenergized.
Claim 4
Dependent Claim
17 words
An electronic shutter according to claim 2, in which said second engaging portion is a stepped portion.
Claim 5
Dependent Claim
17 words
An electronic shutter according to claim 2, in which said second engaging portion is a cam portion.
Claim 6
Dependent Claim
24 words
An electronic shutter according to claim 2, in which said operating lever is pivotable by said second control means when the electromagnet is deenergized.
Claim 7
Dependent Claim
30 words
An electronic shutter according to claim 2 in which said second control means is caused to move away from the electromagnet by said operating lever when the electromagnet is deenergized.
Claim 8
Dependent Claim
32 words
An electronic shutter according to claim 2, in which said operating lever is adapted to be pivoted, before the shutter blades are fully opened, in accordance with the deenergization of said electromagnet.
Claim 9
Dependent Claim
47 words
An electronic shutter according to claim 1, in which is provided a second operating means movable from its cocked position to its stationary position for effecting the closure of the shutter, and retained in its cocked position by said second control means until the electromagnet is deenergized.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |