US4576457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor driven winding mechanism for camera
Assignee: Canon Inc
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Filing: 1985-01-31
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Granted: 1986-03-18
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Expires: 2005-01-31
Abstract
Abstract Rotation control of a motor used as a drive source in a motor driven winding-up mechanism for a camera. By rotating the reversible motor in a forward direction, the winding-up transmission mechanism moves. When the film has been wound up by one frame, the reversible motor rotates in the opposite direction a minute angle.
Inventors
- 👤 Tsuyoshi Fukuda
- 👤 Yoshihiko Aihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:42
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
138 words
A motor driven winding-up mechanism for a camera comprising: (a) an electric motor; (b) a drive circuit for rotating said motor in a winding-up direction; (c) a film winding-up member; (d) a transmitting and driving system for transmitting rotation of said motor to said film winding-up member; (e) winding-up stopping means for stopping rotation of said motor and said transmitting and driving system each time a film has been wound up by a prescribed number of frames; and (f) backward motion driving means for driving at least said transmitting and driving system to rotate to a few degrees of angle in the reversed direction to that in which it rotated when in winding at a time after the film has been wound up by the prescribed frame and before the initiation of the next film frame winding operation.
Claim 2
Dependent Claim
138 words
A motor driven winding-up mechanism for a camera comprising: (a) an electric motor; (b) a drive circuit for rotating said motor in a winding-up direction; (c) a film winding-up member; (d) a transmitting and driving system for transmitting rotation of said motor to said film winding-up member; (e) winding-up stopping means for stopping rotation of said motor and said transmitting and driving system each time a film has been wound up by a prescribed number of frames; and (f) backward motion driving means for driving at least said transmitting and driving system to rotate to a few degrees of angle in the reversed direction to that in which it rotated when in winding at a time after the film has been wound up by the prescribed frame and before the initiation of the next film frame winding operation.
Claim 3
Dependent Claim
45 words
The mechanism according to claim 1, wherein said winding-up stopping means includes a rotary cam having a cam displacement formed in a stopped position as it moves along with said transmitting and driving system, and a winding stop lever slidingly contacting with said rotary cam.
Claim 4
Dependent Claim
25 words
The mechanism according to claim 1, wherein said backward motion driving means is operated each time the winding of film by one frame is completed.
Claim 5
Dependent Claim
26 words
The mechanism according to claim 1, further comprising: (g) voltage detecting means for detecting the voltage of an electrical power source or battery of the camera.
Claim 6
Dependent Claim
27 words
The mechanism according to claim 4, wherein the voltage detection by said voltage detecting means is made carried out when said backward motion driving means is operated.
Claim 7
Dependent Claim
26 words
The mechanism according to claim 1, wherein the operation of said backward motion driving means is carried out in the early stage of a releasing operation.
Claim 8
Dependent Claim
139 words
A motor driven winding-up mechanism for a camera comprising: (a) a reversible motor; (b) a drive circuit for rotating said reversible motor in a winding direction; (c) a film winding-up member; (d) a transmitting and driving system for transmitting rotation of said motor to said film winding-up member; (e) winding-up stopping means for stopping rotation of said motor and said transmitting and driving system each time a film has been wound up by a prescribed number of frames; and (f) backward motion driving means for rotating said reversible motor to a few degrees of angle in a reversed direction to that when in winding up at a time from the moment at which a film has been stopped from advancing through the length of a preset number of frames until the initiation of winding up of the next frame.
Claim 9
Dependent Claim
139 words
A motor driven winding-up mechanism for a camera comprising: (a) a reversible motor; (b) a drive circuit for rotating said reversible motor in a winding direction; (c) a film winding-up member; (d) a transmitting and driving system for transmitting rotation of said motor to said film winding-up member; (e) winding-up stopping means for stopping rotation of said motor and said transmitting and driving system each time a film has been wound up by a prescribed number of frames; and (f) backward motion driving means for rotating said reversible motor to a few degrees of angle in a reversed direction to that when in winding up at a time from the moment at which a film has been stopped from advancing through the length of a preset number of frames until the initiation of winding up of the next frame.
Claim 10
Dependent Claim
45 words
The mechanism according to claim 7, wherein said winding-up stopping means includes a rotary cam having a cam displacement formed in a stopped position as it moves along with said transmitting and driving system, and a winding stop lever slidingly contacting with said rotary cam.
Claim 11
Dependent Claim
25 words
The mechanism according to claim 7, wherein said backward motion driving means is operated each time the winding of film by one frame is completed.
Claim 12
Dependent Claim
70 words
The mechanism according to claim 7, further comprising: (g) a clutch provided at an intermediate point in said transmitting and driving system and operating to connect all said transmitting and driving system when said reversible motor rotates in a winding direction; and (h) a film rewind driving system arranged to connect with said clutch when said reversible motor is rotated in a reversed direction to that when in winding up.
Claim 13
Dependent Claim
16 words
The mechanism according to claim 10, wherein said clutch is made to be a planetary clutch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |