US3635142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exchange lens with the lens-shutter
Assignee: Minolta Co Ltd
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Filing: 1969-04-04
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Granted: 1972-01-18
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Expires: 1989-04-04
Abstract
Abstract A control circuit sets the lens shutter in action in response to the opening action of a focal plane shutter and closes the focal plane shutter after the lens shutter is closed, so that the proper exposure function of the lens shutter is maintained when the focal plane shutter is opened or closed.
Inventors
- 👤 Takeshi Ataka
- 👤 Shohei Tenkumo
- 👤 Minoru Sekita
- 👤 Yuji Nakaniwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:49
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/20; G03B17/00; G03B17/02; G03B17/12; G03B17/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
Apparatus for controlling a camera focal plane shutter and a lens shutter, comprising: a lens shutter mechanism and a focAl plane shutter mechanism; an actuating switch closed upon the opening of said focal plane shutter, and means for opening and closing said lens shutter mechanism including means responsive to said closed actuating switch to open said lens shutter, said means including means for timing the closing of said lens shutter after a selected time period of the opening of said lens shutter, and further including a switch electrically connected to be closed with said lens shutter open and to be open with said lens shutter closed, said switch maintaining the operation of said means for opening and closing to close said lens shutter mechanism with said actuating switch in an open or closed position.
Claim 2
Dependent Claim
134 words
Apparatus for controlling a camera focal plane shutter and a lens shutter, comprising: a lens shutter mechanism and a focAl plane shutter mechanism; an actuating switch closed upon the opening of said focal plane shutter, and means for opening and closing said lens shutter mechanism including means responsive to said closed actuating switch to open said lens shutter, said means including means for timing the closing of said lens shutter after a selected time period of the opening of said lens shutter, and further including a switch electrically connected to be closed with said lens shutter open and to be open with said lens shutter closed, said switch maintaining the operation of said means for opening and closing to close said lens shutter mechanism with said actuating switch in an open or closed position.
Claim 3
Dependent Claim
118 words
Apparatus for controlling a camera focal plane shutter and a lens shutter as in claim 5, wherein said means for timing is a variable delay circuit having different selectable time delays and wherein said means for opening and closing said lens shutter mechanism further includes an electronic switching circuit for closing said lens shutter, said variable delay means is connected to said electronic switching circuit, a timing switch connected with said variable delay means, said timing switch is closed with said lens shutter closed and opened with the opening of said lens shutter to actuate said variable delay means to control the closing of said lens shutter in accordance with the selectable delay of said variable delay means.
Claim 4
Dependent Claim
106 words
An apparatus for controlling a camera focal plane shutter and a lens shutter as in claim 5 further comprising an electronic switching circuit for opening and closing said focal plane shutter, said additional circuit including a variable delay means having different selectable time delays and connected to said additional circuit, a safety switch connected with said variable delay means, said safety switch is closed with the opening of said lens shutter to prevent operation of said delay means and said safety switch is opened after said lens shutter is closed to operate said delay means to activate said additional circuit and close said focal plane shutter.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |