US3925799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter control arrangement for cameras
Assignee: Nidec Precision Corp
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Filing: 1974-03-27
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Granted: 1975-12-09
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Expires: 1994-03-27
Abstract
Abstract Shutter mechanism for cameras comprising a hold lever operated by shutter releasing, a mechanical delaying means for delaying the movement of the hold lever, and a rear blade release lever, which is moved by the hold lever and releases a rear blade actuating lever, only in case that the voltage of a power source cell decreases to or less than a pre-determined value and a magnet lever is not attracted for holding by an electro-magnet simultaneously with shutter releasing, thus said shutter mechanism being arranged so that exposure can be reliably carried out at a pre-determined shutter speed which is designed beforehand even in case that the voltage of the power source cell decreases to or less than a pre-determined value. Besides, said shutter mechanism is provided with an indicating lever which appears in the finder of the camera only when exposure is carried out at said pre-determined shutter speed which is designed beforehand.
Inventors
- 👤 Atsutada Nakatani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:40
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/58
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
243 words
A shutter mechanism for cameras comprising: a control lever arranged to be released from its locked condition by shutter release operation, a front blade release lever engageable with said control lever and rotated by movement of said control lever, a front blade actuating lever engageable with said front blade release lever and released by movement of said front blade release lever to move front blades, a hold lever engageable with said control lever and rotated by movement of said control lever, a magnet lever engageable with said hold lever and rotatable by following rotation of said hold lever, a rear blade release lever engageable with said magnet lever and rotated by said magnet lever at the final stage of movement of said magnet lever, a rear blade actuating lever engageable with said rear blade release lever and released by rotation of said rear blade release lever to move rear blades, a lock lever engageable with said magnet lever and capable of locking said magnet lever, an indication control lever engaging with said magnet lever and engageable with said control lever, and an indicating lever connected to said indication control lever, engagement of said magnet lever and lock lever being released by said front blade actuating lever at the final stage of movement of said front blade actuating lever, and said indicating lever being moved by said control lever through said indication control lever when said magnet lever is locked by said lock lever.
Claim 2
Dependent Claim
243 words
A shutter mechanism for cameras comprising: a control lever arranged to be released from its locked condition by shutter release operation, a front blade release lever engageable with said control lever and rotated by movement of said control lever, a front blade actuating lever engageable with said front blade release lever and released by movement of said front blade release lever to move front blades, a hold lever engageable with said control lever and rotated by movement of said control lever, a magnet lever engageable with said hold lever and rotatable by following rotation of said hold lever, a rear blade release lever engageable with said magnet lever and rotated by said magnet lever at the final stage of movement of said magnet lever, a rear blade actuating lever engageable with said rear blade release lever and released by rotation of said rear blade release lever to move rear blades, a lock lever engageable with said magnet lever and capable of locking said magnet lever, an indication control lever engaging with said magnet lever and engageable with said control lever, and an indicating lever connected to said indication control lever, engagement of said magnet lever and lock lever being released by said front blade actuating lever at the final stage of movement of said front blade actuating lever, and said indicating lever being moved by said control lever through said indication control lever when said magnet lever is locked by said lock lever.
Claim 3
Dependent Claim
263 words
A shutter mechanism for cameras comprising: a control lever arranged to be released from its locked condition by shutter release operation, a front blade release lever engageable with said control lever and rotated by movement of said control lever, a front blade actuating lever engageable with said front blade release lever and released by movement of said front blade release lever to move front blades, a hold lever engageable with said control lever and rotated by movement of said control lever, a magnet lever engageable with said hold lever and rotatable by following rotation of said hold lever, a rear blade release lever engageable with said magnet lever and rotated by said magnet lever at the final stage of movement of said magnet lever, a rear blade actuating lever engageable with said rear blade release lever and released by rotation of said rear blade release lever to move rear blades, a lock lever engageable with said magnet lever and capable of loCking said magnet lever, a lock release lever engaged with said lock lever, an X-contact control lever engaged with said lock release lever and engageable with said front blade actuating lever, an X-contact lever engageable with said X-contact control lever, and an X-contact strip contactable with said X-contact lever, engagement of said magnet lever and lock lever being released by said front blade actuating lever at the final stage of movement of said front blade actuating lever, and said X-contact lever being brought into contact with said X-contact strip when said X-contact control lever is rotated by said front blade actuating lever.
Claim 4
Dependent Claim
263 words
A shutter mechanism for cameras comprising: a control lever arranged to be released from its locked condition by shutter release operation, a front blade release lever engageable with said control lever and rotated by movement of said control lever, a front blade actuating lever engageable with said front blade release lever and released by movement of said front blade release lever to move front blades, a hold lever engageable with said control lever and rotated by movement of said control lever, a magnet lever engageable with said hold lever and rotatable by following rotation of said hold lever, a rear blade release lever engageable with said magnet lever and rotated by said magnet lever at the final stage of movement of said magnet lever, a rear blade actuating lever engageable with said rear blade release lever and released by rotation of said rear blade release lever to move rear blades, a lock lever engageable with said magnet lever and capable of loCking said magnet lever, a lock release lever engaged with said lock lever, an X-contact control lever engaged with said lock release lever and engageable with said front blade actuating lever, an X-contact lever engageable with said X-contact control lever, and an X-contact strip contactable with said X-contact lever, engagement of said magnet lever and lock lever being released by said front blade actuating lever at the final stage of movement of said front blade actuating lever, and said X-contact lever being brought into contact with said X-contact strip when said X-contact control lever is rotated by said front blade actuating lever.
Claim 5
Dependent Claim
275 words
A shutter mechanism for cameras comprising: a control lever arranged to be released from its locked condition by shutter release operation, a front blade release lever engageable with said control lever and rotated by movement of said control lever, a front blade actuating lever engageable with said front blade release lever and released by movement of said front release lever to move front blades, a hold lever engageable with said control lever and rotated by movement of said control lever, a magnet lever engageable with said hold lever and rotatable by following rotation of said hold lever, a rear blade release lever engageable with said magnet lever and rotated by said magnet lever at the final stage of movement of said magnet lever, a rear blade actuating lever engageable with said rear blade release lever and released by rotation of said rear blade release lever to move rear blades, a lock lever engageable with said magnet lever and capable of locking said magnet lever, a shutter release plate engageable with said control lever and capable of locking said control lever in its cocked position, an actuating plate engageable with said shutter release plate, a mirror returning plate connected to said actuating plate, a mirror actuating plate engaged with said mirror returning plate, and a mirror actuating pin engageable with said mirror actuating plate, engagement of said magnet lever and lock lever being released by said front blade actuating lever at the final stage of movement of said front blade actuating lever, and said mirror actuating pin being pushed by said mirror actuating plate by shutter release operation and a reflecting mirror being sprung up thereby.
Claim 6
Dependent Claim
275 words
A shutter mechanism for cameras comprising: a control lever arranged to be released from its locked condition by shutter release operation, a front blade release lever engageable with said control lever and rotated by movement of said control lever, a front blade actuating lever engageable with said front blade release lever and released by movement of said front release lever to move front blades, a hold lever engageable with said control lever and rotated by movement of said control lever, a magnet lever engageable with said hold lever and rotatable by following rotation of said hold lever, a rear blade release lever engageable with said magnet lever and rotated by said magnet lever at the final stage of movement of said magnet lever, a rear blade actuating lever engageable with said rear blade release lever and released by rotation of said rear blade release lever to move rear blades, a lock lever engageable with said magnet lever and capable of locking said magnet lever, a shutter release plate engageable with said control lever and capable of locking said control lever in its cocked position, an actuating plate engageable with said shutter release plate, a mirror returning plate connected to said actuating plate, a mirror actuating plate engaged with said mirror returning plate, and a mirror actuating pin engageable with said mirror actuating plate, engagement of said magnet lever and lock lever being released by said front blade actuating lever at the final stage of movement of said front blade actuating lever, and said mirror actuating pin being pushed by said mirror actuating plate by shutter release operation and a reflecting mirror being sprung up thereby.
Claim 7
Dependent Claim
75 words
A shutter mechanism for cameras according to claim 3, in which said shutter mechanism further comprises a mirror operating lever connected to said mirror actuating pin, a mirror locking lever engageable with said mirror operating lever, and an indicating lever engaged with said mirror locking lever, said mirror operating lever being locked by said mirror locking lever when said indicating lever is moved and said reflecting mirror thereby being held in its sprung up position.
Claim 8
Dependent Claim
68 words
A shutter mechanism according to claim 5, in which said shutter mechanism further comprises a cam plate engaged with said indicating lever, and a mirror returning lever engaged with said cam plate and engageable with said mirror returning plate, said indicating lever being moved to its non-indicating position when said cam plate is rotated and, at the same time, said reflecting mirror being returned to its normal position.
Claim 9
Dependent Claim
49 words
A shutter mechanism according to claim 5, in which said shutter mechanism further comprises a release lock lever engaged with said cam plate, and a release button engageable with said release lock lever, said release button being locked by said release lock lever when said cam plate is rotated.
References Cited (Backward Citations)
US3777646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |