Patent US3759156A successfully refreshed from Google Patents.
US3759156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic camera provided with electrically controlled shutter
Assignee: Minolta Co Ltd
•
Filing: 1972-06-02
•
Granted: 1973-09-18
•
Expires: 1992-06-02
Abstract
Abstract A photographic camera provided with a curtain shutter in which the time interval between the actuation of an opening curtain and a closing curtain is controlled by an electrical control circuit, wherein when a winding means winds a film and the shutter is cocked, a stop lever restrains the turning of the winding means and releases the restraint of the winding means with the termination of the driving of the closing curtain to the rest position in response to the shutter release operation. A detecting member detects the power voltage drop in an electrical control circuit, which voltage drop is lower than a predetermined value at which proper exposure control becomes impossible to be effected by the electrical control circuit. The detecting member prevents the release of the winding means which is restrained by the stop lever at the time of exposure termination and also prevents the shutter curtain from being wound to the cocked position so as to prevent repeated photographing under improper exposure conditions.
Inventors
- 👤 T Kobori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:22
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12; G03B17/00; G03B17/42; G03B7/00; G03B7/08; G03B7/081; G03B7/083; G03B9/00; G03B9/58
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
323 words
In a photographic camera, a shutter control mechanism, comprising: an exposure control circuit including a battery power source, a power source switch closed by operation of the camera release mechanism, timing circuit for determining the duration of the exposure, a trigger switch for actuating said timing circuit; curtain shutter members including an opening curtain and a closing curtain, said opening curtain is movable from a cocked position to a rest position to initiate exposure, and said closing curtain is movable from a cocked position to a rest position to terminate exposure; said exposure control circuit further including control means actuated by the closing of said power source switch and deactuated by the operation of said timing circuit for controlling the movement of said curtain shutter members; winding means for moving said opening curtain and said closing curtain from the respective rest positions thereof to the respective cocked positions thereof; means for restraining said winding means with said curtain members in said cocked position; means for controlling the movement of said opening curtain whereby said opening curtain is retained in said cocked position and is released for movement with operation of the shutter release mechanism with said power source switch closed; said control means including means for retaining said closing curtain at said cocked position subsequent to the release of said means for restraining when said current to said connrol means exceeds a predetermined value; means for retracting said means for restraining from the restraining position thereof; first means responsive to the movement of said opening curtain for actuating said means for retracting; second means responsive to the movement of said closing curtain; and means actuated by said second means for preventing the actuation of said means for retracting when said control means is not actuated to retain said closing curtain at said cocked position and when said closing curtain starts to move substantially immediately from the start of movement of said opening curtain.
Claim 2
Dependent Claim
323 words
In a photographic camera, a shutter control mechanism, comprising: an exposure control circuit including a battery power source, a power source switch closed by operation of the camera release mechanism, timing circuit for determining the duration of the exposure, a trigger switch for actuating said timing circuit; curtain shutter members including an opening curtain and a closing curtain, said opening curtain is movable from a cocked position to a rest position to initiate exposure, and said closing curtain is movable from a cocked position to a rest position to terminate exposure; said exposure control circuit further including control means actuated by the closing of said power source switch and deactuated by the operation of said timing circuit for controlling the movement of said curtain shutter members; winding means for moving said opening curtain and said closing curtain from the respective rest positions thereof to the respective cocked positions thereof; means for restraining said winding means with said curtain members in said cocked position; means for controlling the movement of said opening curtain whereby said opening curtain is retained in said cocked position and is released for movement with operation of the shutter release mechanism with said power source switch closed; said control means including means for retaining said closing curtain at said cocked position subsequent to the release of said means for restraining when said current to said connrol means exceeds a predetermined value; means for retracting said means for restraining from the restraining position thereof; first means responsive to the movement of said opening curtain for actuating said means for retracting; second means responsive to the movement of said closing curtain; and means actuated by said second means for preventing the actuation of said means for retracting when said control means is not actuated to retain said closing curtain at said cocked position and when said closing curtain starts to move substantially immediately from the start of movement of said opening curtain.
Claim 3
Dependent Claim
259 words
A shutter control mechanism as in claim 1 wherein: said first means includes a first member rotatable in response to movement of said opening curtain from said rest position to said cocked position and including a first pin mounted thereon; said second means includes a second member rotatable in response to movement of said closing curtain from said rest position to said cocked position and including a second pin mounted thereon; said shutter control mechanism further comprises clutch means for transmitting the movement of said winding means to said second member through said first member by the engagement of said first and second pins; said means for retracting includes a third member mounted to be rotatable between a first position out of the rotating path of said second pin and a second position in the rotating path of said second pin, said third member is normally in said first position and is rotated to said second position in response to the rotation of said first pin with the movement of said opening curtain from said cocked position to said rest position; said shutter control mechanism further comprising additional means for restraining said third member in said first position with said second pin rotating with said first pin to maintain the restraint of said winDing means by said means for restraining, and said third member is rotated to said second position to be in engagement with said second pin for releasing said means for restraining when said second pin rotates more than a predetermined angle relative to said first pin.
Claim 4
Dependent Claim
122 words
A shutter control mechanism as in claim 2 wherein said third member includes a first lever rotatably mounted to the camera body, said first lever including a projection, and a second lever rotatably mounted to said camera body coaxially with said first lever, said first and second levers are rotatable between a first and second position and biased normally in said first position, said first and second levers are rotated to said second position by engagement with said projection when said first pin engages with said first lever, and means for preventing rotation of said first and second levers to said second position with said first pin engaging said second pin and said second pin is in engagement with said first lever.
Claim 5
Dependent Claim
120 words
A shutter control mechanism as in claim 2 wherein said means for retracting further includes a third lever rotatably mounted to said camera body and including a forked portion having a first arm engageable with said first pin and a second arm rotatable between a first and a second position, said second arm is rotated to said second position with said first pin rotating in spaced angular relationship with said second pin and with said second pin engaging said first arm, and means for preventing the rotation of said second arm to said second position with said first pin and said second pin rotating in contact with one another and said second pin is in engagement with said first arm.
Claim 6
Dependent Claim
234 words
In a photographic camera, a shutter control mechanism, comprising: an exposure control circuit including a battery power source, a power source switch closed with operation of the camera release mechanism, a timing circuit for determining the duration of the exposure, a trigger switch for actuating said timing circuit; a leading shutter member movable from a cocked position to a rest position to initiate exposure, and a trailing shutter member movable from a cocked position to a rest position to terminate exposure; said exposure control circuit further including control means actuated by the closing of said power source switch for restraining said trailing shutter member at said cocked position and deactuated by the operation of said timing circuit for releasing said trailing shutter member; means for cocking said leading and trailing shutter members; means for restraining said means for cocking with said leading and trailing shutter members in said respective cocked positions; first means responsive to the movement of said leading shutter member from said cocked position to said rest position to retract said means for restraining from the restraining position; second means responsive to the movement of said trailing shutter member from said cocked position to said rest position; and means actuated by said second means for preventing the operation of said first means when said trailing shutter member prematurely starts to move subsequent to the start of movement of said leading shutter member.
Claim 7
Dependent Claim
234 words
In a photographic camera, a shutter control mechanism, comprising: an exposure control circuit including a battery power source, a power source switch closed with operation of the camera release mechanism, a timing circuit for determining the duration of the exposure, a trigger switch for actuating said timing circuit; a leading shutter member movable from a cocked position to a rest position to initiate exposure, and a trailing shutter member movable from a cocked position to a rest position to terminate exposure; said exposure control circuit further including control means actuated by the closing of said power source switch for restraining said trailing shutter member at said cocked position and deactuated by the operation of said timing circuit for releasing said trailing shutter member; means for cocking said leading and trailing shutter members; means for restraining said means for cocking with said leading and trailing shutter members in said respective cocked positions; first means responsive to the movement of said leading shutter member from said cocked position to said rest position to retract said means for restraining from the restraining position; second means responsive to the movement of said trailing shutter member from said cocked position to said rest position; and means actuated by said second means for preventing the operation of said first means when said trailing shutter member prematurely starts to move subsequent to the start of movement of said leading shutter member.
Claim 8
Dependent Claim
244 words
In a shutter mechanism for a photographic camera including a shutter opening member movable from a cocked position to a rest position for initiating exposure, a shutter closing member movable from a cocked position to a rest position for terminating the exposure, manually operative means for moving said opening member and said closing member from said respective rest positions to said respective cocked positions, means for actuating said shutter opening member to move away from said cocked position in response to shutter releasing operation, an electromagnetic means for restraining said shutter closing member at said cocked position, a timing circuit for de-energizing said electromagnetic means to release the restraint of said shutter closing member and actuate the lAtter from said cocked position after a time interval subsequent to the actuation of said shutter opening member, and a battery power source for energizing at least said electromagnetic means, the improvement comprising: an operating member for enabling cocking of said opening and closing members; first means for actuating said operating member in response to the movement of said shutter opening member from said cocked position to said rest position; second means responsive to the movement of said shutter closing member from said cocked position to said rest position; and means actuated by said second means for preventing the actuation of said operating member when said shutter closing member is prematurely actuated to move from said cocked position subsequent to the actuation of said shutter opening curtain.
Claim 9
Dependent Claim
244 words
In a shutter mechanism for a photographic camera including a shutter opening member movable from a cocked position to a rest position for initiating exposure, a shutter closing member movable from a cocked position to a rest position for terminating the exposure, manually operative means for moving said opening member and said closing member from said respective rest positions to said respective cocked positions, means for actuating said shutter opening member to move away from said cocked position in response to shutter releasing operation, an electromagnetic means for restraining said shutter closing member at said cocked position, a timing circuit for de-energizing said electromagnetic means to release the restraint of said shutter closing member and actuate the lAtter from said cocked position after a time interval subsequent to the actuation of said shutter opening member, and a battery power source for energizing at least said electromagnetic means, the improvement comprising: an operating member for enabling cocking of said opening and closing members; first means for actuating said operating member in response to the movement of said shutter opening member from said cocked position to said rest position; second means responsive to the movement of said shutter closing member from said cocked position to said rest position; and means actuated by said second means for preventing the actuation of said operating member when said shutter closing member is prematurely actuated to move from said cocked position subsequent to the actuation of said shutter opening curtain.
References Cited (Backward Citations)
US3435745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |