US3640202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single lens reflex camera
Assignee: Pentax Corp
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Filing: 1970-01-21
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Granted: 1972-02-08
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Expires: 1990-01-21
Abstract
Abstract A single lens reflex camera with an automatic preset diaphragm includes a first spring loadable lever for advancing the camera mirror out of the objective light path and a second spring loadable lever for stopping down the diaphragm. The first lever includes a stop which engages a stop on the second lever to lock it in a retracted position when the first lever is in retracted position and cooperating elements releasably lock the first lever in its retracted position. Upon release, the first lever is spring advanced and advances the mirror and disengages the stops so that the second lever is spring advanced to stop down the diaphragm.
Inventors
- 👤 Katsuhiko Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:26
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
286 words
In an automatic diaphragm, single lens reflex camera including a mirror swingable between a retracted viewing position and an advanced photographing position, and a diaphragm control element movable between an advanced diaphragm stop down position and a retracted diaphragm release positIon, the improvement comprising mirror drive means movable between a mirror advanced position and a retracted position and spring urged to an advanced position, diaphragm drive means movable between a diaphragm control element advanced position and a retracted position and spring urged to an advanced position, a first locking means for releasably locking a first of said drive means in a retracted position, and releasably engageable hold means carried by said mirror and diaphragm drive means and defining second locking means for releasably locking the second of said drive means in a retracted position, said hold means being disengaged with the advance of said first drive means to release said second drive means, said first drive means comprising a first lever mounted for swinging between advanced and retracted positions and a first spring engaging said first lever and urging it toward an advanced position, said second drive means comprising a second lever mounted for swinging between advanced and retracted positions and a second spring engaging said second lever and urging it toward an advanced position, and said second locking means comprising first and second hold means defining abutments located on and movable with said first and second levers respectively and being in opposing engagement when said levers are in their retracted positions to releasably lock said second lever in its retracted position, said first abutment being movable with the advance of said first lever out of engagement with said second abutment to release said second lever.
Claim 2
Dependent Claim
286 words
In an automatic diaphragm, single lens reflex camera including a mirror swingable between a retracted viewing position and an advanced photographing position, and a diaphragm control element movable between an advanced diaphragm stop down position and a retracted diaphragm release positIon, the improvement comprising mirror drive means movable between a mirror advanced position and a retracted position and spring urged to an advanced position, diaphragm drive means movable between a diaphragm control element advanced position and a retracted position and spring urged to an advanced position, a first locking means for releasably locking a first of said drive means in a retracted position, and releasably engageable hold means carried by said mirror and diaphragm drive means and defining second locking means for releasably locking the second of said drive means in a retracted position, said hold means being disengaged with the advance of said first drive means to release said second drive means, said first drive means comprising a first lever mounted for swinging between advanced and retracted positions and a first spring engaging said first lever and urging it toward an advanced position, said second drive means comprising a second lever mounted for swinging between advanced and retracted positions and a second spring engaging said second lever and urging it toward an advanced position, and said second locking means comprising first and second hold means defining abutments located on and movable with said first and second levers respectively and being in opposing engagement when said levers are in their retracted positions to releasably lock said second lever in its retracted position, said first abutment being movable with the advance of said first lever out of engagement with said second abutment to release said second lever.
Claim 3
Dependent Claim
19 words
The camera of claim 1 including selectively actuatable means for releasably locking said first lever in a retracted position.
Claim 4
Dependent Claim
26 words
The camera of claim 1 including a spring-loading arm, said first and second springs extending between said spring-loading arm and said first and second levers respectively.
Claim 5
Dependent Claim
24 words
The camera of claim 1 including a spring retracted movable shutter release member advanced in response to the advance of one of said levers.
Claim 6
Dependent Claim
138 words
In an automatic diaphragm, single lens reflex camera including a mirror swingable between a retrActed viewing position and an advance photographing position, and a diaphragm control element movable between an advance diaphragm stop-down position and a retracted diaphragm release position, the improvement comprising a mirror driving first lever movable between an advanced position urging said mirror to its advance position and a retracted position and spring urged to its advanced position, a latching second lever releasably locking said first lever in its retracted position, and a diaphragm control third lever movable between an advance position advancing said diaphragm control element and a retracted position and spring urged to its position, said third lever being releasably locked in its retracted position by said first lever in its retracted position and being released by the advance of said first lever.
Claim 7
Dependent Claim
138 words
In an automatic diaphragm, single lens reflex camera including a mirror swingable between a retrActed viewing position and an advance photographing position, and a diaphragm control element movable between an advance diaphragm stop-down position and a retracted diaphragm release position, the improvement comprising a mirror driving first lever movable between an advanced position urging said mirror to its advance position and a retracted position and spring urged to its advanced position, a latching second lever releasably locking said first lever in its retracted position, and a diaphragm control third lever movable between an advance position advancing said diaphragm control element and a retracted position and spring urged to its position, said third lever being releasably locked in its retracted position by said first lever in its retracted position and being released by the advance of said first lever.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |