US4017875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera allowing multiple exposure
Assignee: Canon Inc
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Filing: 1975-08-26
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Granted: 1977-04-12
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Expires: 1995-08-26
Abstract
Abstract The present invention relates to a camera having a wind up device which effects shutter charge and film advancing operation simultaneously by a conventionally known wind up lever and a rewinding device, having the capability to be changed over by pressing a rewinding button from a film wind up state to a film rewinding state, wherein multiple exposure is made possible by manipulation of the rewinding button and at the same time change over from the rewinding state to the wind up state is effected in association with shutter operation.
Inventors
- 👤 Masayoshi Yamamichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:22
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/02; G03B1/04; G03B1/06; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
A single lens reflex camera for multiple exposure photography including a shutter comprising: winding means for shutter cocking; film takeup means linked with said winding means; manually operable clutch means normally maintained in an engaged position; a film advancing sprocket linked with said film takeup means through said manually operable clutch means; operating means for manually operating said clutch means; displaceable retaining means adapted to be engaged with said operating means for retaining said clutch means in a disengaged position; shutter releasing means; and relieving means performing a reciprocating motion linked with said shutter releasing means; said relieving means actuating said retaining means in the advancing motion thereof to relieve said clutch means from said disengaged position to said engaged position prior to the opening function of the shutter.
Claim 2
Dependent Claim
129 words
A single lens reflex camera for multiple exposure photography including a shutter comprising: winding means for shutter cocking; film takeup means linked with said winding means; manually operable clutch means normally maintained in an engaged position; a film advancing sprocket linked with said film takeup means through said manually operable clutch means; operating means for manually operating said clutch means; displaceable retaining means adapted to be engaged with said operating means for retaining said clutch means in a disengaged position; shutter releasing means; and relieving means performing a reciprocating motion linked with said shutter releasing means; said relieving means actuating said retaining means in the advancing motion thereof to relieve said clutch means from said disengaged position to said engaged position prior to the opening function of the shutter.
Claim 3
Dependent Claim
19 words
A single lens reflex camera according to claim 1 including an automatic diaphragm member for actuating said relieving means.
Claim 4
Dependent Claim
21 words
A single lens reflex camera according to the claim 1 including a mirror actuating member having said relieving means linked thereto.
References Cited (Backward Citations)
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Cited
US3650191A
Cited
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Cited
US3829876A
Cited
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Cited
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Cited
US3757660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |