US3731602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflex camera automatic shutter timing mechanism
Assignee: Pentax Corp
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Filing: 1971-11-26
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Granted: 1973-05-08
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Expires: 1991-11-26
Abstract
Abstract A single lens reflex camera includes a shutter control network connected through a first normally open switch to an energizing battery and containing a light measuring circuit and an adjusting circuit connected to a computor circuit whose output is connected through a normally closed second switch to a memory circuit which controls a shutter timing circuit. The partial depression of the shutter release button closes the first switch and a mirror retraction member, before release of the shutter, actuates a member which locks the button in its depressed position and opens the second switch. The return of the mirror retraction member retracts the locking member to close the second switch and release the shutter release button which returns to its retracted position and opens the first switch.
Inventors
- 👤 Y Umemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:58
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
206 words
In a single lens reflex camera including an electrically timed automatic shutter, an electrical network for timing said shutter in response to the camera incident light including a voltage source, a first normally open switch connecting said voltage source to said network, a memory circuit and a normally closed memory circuit actuating switch connected to said memory circuit, a mirror swingable between an advanced position and a photographing retracted position, a mirror drive member for retracting and advancing said mirror, a shutter release member advancable to sequentially close said first switch and release said drive member to retract said mirror, a longitudinally movable slide member spring biased to follow said drive member to move to an advanced position with the mirror retraction movement of said drive member, said slide member having a first end movable with the advance of said slide member into locking engagement with said shutter release member in its advanced switch closing position and movable with the retraction of said slide member to release said shutter release member and an opposite second end movable with the retraction of said slide member to close said second switch and with the advance of said slide member to release said second switch to its open position.
Claim 2
Dependent Claim
206 words
In a single lens reflex camera including an electrically timed automatic shutter, an electrical network for timing said shutter in response to the camera incident light including a voltage source, a first normally open switch connecting said voltage source to said network, a memory circuit and a normally closed memory circuit actuating switch connected to said memory circuit, a mirror swingable between an advanced position and a photographing retracted position, a mirror drive member for retracting and advancing said mirror, a shutter release member advancable to sequentially close said first switch and release said drive member to retract said mirror, a longitudinally movable slide member spring biased to follow said drive member to move to an advanced position with the mirror retraction movement of said drive member, said slide member having a first end movable with the advance of said slide member into locking engagement with said shutter release member in its advanced switch closing position and movable with the retraction of said slide member to release said shutter release member and an opposite second end movable with the retraction of said slide member to close said second switch and with the advance of said slide member to release said second switch to its open position.
Claim 3
Dependent Claim
25 words
The single lens reflex camera of claim 1 comprising motion transmission means including a swingable lever intercoupling said mirror drive member and said slide member.
Claim 4
Dependent Claim
16 words
The single lens reflex camera of claim 1 including means for manually retracting said slide member.
Claim 5
Dependent Claim
59 words
The single lens reflex camera of claim 1 wherein said shutter release member comprises a rod having an enlarged portion and said slide member first end is provided with a longitudinal slot open at the free end of said slide member and adapted to slideably engage said rod and having a width less than that of said enlarged portion.
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |