Patent US3849787A successfully refreshed from Google Patents.
US3849787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens shutter with pre-view device for a photographic camera
Assignee: Seiko Koki KK
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Filing: 1972-12-29
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Granted: 1974-11-19
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Expires: 1992-12-29
Abstract
Abstract A lens shutter with a pre-view device. The shutter has a shutter blade operating member, constructed as an operating ring, for opening and closing the lens aperture. A lock member releasably locks a shutter release member that controls the release of the shutter blade operating member for opening and closing the lens aperture or exposure aperture for taking a photographic exposure. A pre-viewing device has an actuating member for operating the shutter blades operating member to an opening position for previewing of a scene to be photographed. The actuating member cooperates with a release member that releases the lock member for taking of exposures and which releasably holds the actuating member in an operating position in which the lens aperture is open thereby allowing the previewing and then releases the actuating member for closing the lens aperture. This release member effects the control of the pre-viewing device while the lens shutter is in a charged state without possibility of triggering of the lock member it cooperates with for effecting control of photographic exposures.
Inventors
- 👤 T Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:03
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18; G03B9/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
229 words
In a lens shutter, at least one shutter blade for opening and closing a lens aperture, a shutter blade operating member for operating said at least one shutter blade to an open position and a closed position opening and closing the lens aperture, a drive member for driving said operating member for opening and closing the lens aperture for taking photographic exposures, a lock member for releasably locking said drive member operable to release said drive member for taking of said exposures, a preview device coactive with said operating member for opening and closing the lens shutter with said operating member at will for viewing through said lens aperture the scene to be photographed comprising an actuating member operable from a rest position to a first position and back to said rest position for actuating said shutter blade operating member for respectively opening and closing said at least one blade to open and close the lens aperture independently of said drive member for pre-viewing the scene to be photographed, a release member for releasing said lock member for taking exposures and for releasably holding said actuating member in said first position when actuating said operating member to a position opening said at least one shutter blade and being operable to release said actuating member for allowing said operating member to close the shutter blade thereby closing the lens aperture.
Claim 2
Dependent Claim
229 words
In a lens shutter, at least one shutter blade for opening and closing a lens aperture, a shutter blade operating member for operating said at least one shutter blade to an open position and a closed position opening and closing the lens aperture, a drive member for driving said operating member for opening and closing the lens aperture for taking photographic exposures, a lock member for releasably locking said drive member operable to release said drive member for taking of said exposures, a preview device coactive with said operating member for opening and closing the lens shutter with said operating member at will for viewing through said lens aperture the scene to be photographed comprising an actuating member operable from a rest position to a first position and back to said rest position for actuating said shutter blade operating member for respectively opening and closing said at least one blade to open and close the lens aperture independently of said drive member for pre-viewing the scene to be photographed, a release member for releasing said lock member for taking exposures and for releasably holding said actuating member in said first position when actuating said operating member to a position opening said at least one shutter blade and being operable to release said actuating member for allowing said operating member to close the shutter blade thereby closing the lens aperture.
Claim 3
Dependent Claim
26 words
In a lens shutter according to claim 1, in which said shutter blade operating member comprises a ring rotational about the axis of the lens aperture.
Claim 4
Dependent Claim
39 words
In a lens shutter according to claim 1, in which said actuating member comprises means for releasably locking said release member during actuation of said pre-viewing device to avoid releasing said drive member, thereby avoiding taking of an exposure.
Claim 5
Dependent Claim
105 words
In a lens shutter having a shutter blade, a shutter blade operating member for opening and closing the shutter for taking photographic exposures, pre-view means for viewing through a lens aperture the scene to be photographed comprising actuating means coactive with the shutter blade operating member for opening the shutter lens aperture and maintaining it open, at will, and release means coactive with the actuating means for maintaining the lens shutter open for pre-viewing and operable for initiating taking of photographic exposures independently of said actuating means, and means coactive with said release means for initiating taking of photographic exposures independently of said actuating means.
Claim 6
Dependent Claim
105 words
In a lens shutter having a shutter blade, a shutter blade operating member for opening and closing the shutter for taking photographic exposures, pre-view means for viewing through a lens aperture the scene to be photographed comprising actuating means coactive with the shutter blade operating member for opening the shutter lens aperture and maintaining it open, at will, and release means coactive with the actuating means for maintaining the lens shutter open for pre-viewing and operable for initiating taking of photographic exposures independently of said actuating means, and means coactive with said release means for initiating taking of photographic exposures independently of said actuating means.
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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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |