US4568164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor drive camera
Assignee: Canon Inc
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Filing: 1985-01-31
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Granted: 1986-02-04
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Expires: 2005-01-31
Abstract
Abstract A motor driven camera for winding and rewinding film by an electric motor includes a mechanism for detecting the end of a length of loaded film to produce an actuating signal. An automatic changeover mechanism responds to the actuating signal by changing the state of a film transport mechanism in the camera from a film winding operating mode to a film rewinding operating mode. The automatic changeover mechanism is arranged to be operated in response to closing of the back cover of the camera. Accordingly, the transition from the winding to the rewinding operating modes is controlled automatically.
Inventors
- 👤 Daisuke Sahori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:46
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/60; G03B1/62; G03B17/00; G03B17/42; G03B17/425
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
A camera having a motor drive for performing winding and rewinding operations on a film loaded in the camera so as to have a windable portion, including: a film transport mechanism for selectively winding and rewinding the loaded film, means for detecting an end of the windable portion of the loaded film to produce a termination signal, automatic changeover means responsive to said termination signal for changing over said film transport mechanism from a first state for the winding mode of operation to a second state for the rewinding mode of operation, a back cover on the camera for enabling the loaded film to be exchanged; and means responsive to closing of said back cover for setting said automatic changeover means in a condition to carry out the changing over operation.
Claim 2
Dependent Claim
131 words
A camera having a motor drive for performing winding and rewinding operations on a film loaded in the camera so as to have a windable portion, including: a film transport mechanism for selectively winding and rewinding the loaded film, means for detecting an end of the windable portion of the loaded film to produce a termination signal, automatic changeover means responsive to said termination signal for changing over said film transport mechanism from a first state for the winding mode of operation to a second state for the rewinding mode of operation, a back cover on the camera for enabling the loaded film to be exchanged; and means responsive to closing of said back cover for setting said automatic changeover means in a condition to carry out the changing over operation.
Claim 3
Dependent Claim
163 words
A camera having a motor drive for performing winding and rewinding operations on a windable portion of film loaded in the camera, including: a film transport mechanism for selectively winding and rewinding the loaded film, means for detecting an end of the length of loaded film to produce a termination signal, automatic changeover means responsive to said termination signal for changing over said film transport mechanism from a first state for the winding mode of operation to a second state for the rewinding mode of operation, a back cover on the camera for enabling the loaded film to be exchanged, means responsive to closing of said back cover for setting said automatic changeover means in an operative position, and operating means for releasing said setting means at a desired position of the loaded film before the detection of the end of the windable portion of loaded film, by said detecting means, said operating means actuating said detecting means to actuate said setting means.
Claim 4
Dependent Claim
163 words
A camera having a motor drive for performing winding and rewinding operations on a windable portion of film loaded in the camera, including: a film transport mechanism for selectively winding and rewinding the loaded film, means for detecting an end of the length of loaded film to produce a termination signal, automatic changeover means responsive to said termination signal for changing over said film transport mechanism from a first state for the winding mode of operation to a second state for the rewinding mode of operation, a back cover on the camera for enabling the loaded film to be exchanged, means responsive to closing of said back cover for setting said automatic changeover means in an operative position, and operating means for releasing said setting means at a desired position of the loaded film before the detection of the end of the windable portion of loaded film, by said detecting means, said operating means actuating said detecting means to actuate said setting means.
Claim 5
Dependent Claim
143 words
A camera having a motor drive for performing winding and rewinding operations on a film loaded in the camera so as to have a windable portion, comprising: first detection means for detecting completion of winding loaded film; second detection means for detecting completion of an exposure operation; third detection means for detecting an end of the windable portion of the loaded film; control means for controlling rotation of the motor, said control means comprising switch means having a winding mode to normally rotate the motor, a braking mode to brake the motor and a rewinding mode to rotate the motor in reverse, said switch means being arranged to switch to the braking mode upon detection by the first detection means, to the winding mode upon detection by the second detection means, and to the rewinding mode upon detection by the third detection means.
Claim 6
Dependent Claim
143 words
A camera having a motor drive for performing winding and rewinding operations on a film loaded in the camera so as to have a windable portion, comprising: first detection means for detecting completion of winding loaded film; second detection means for detecting completion of an exposure operation; third detection means for detecting an end of the windable portion of the loaded film; control means for controlling rotation of the motor, said control means comprising switch means having a winding mode to normally rotate the motor, a braking mode to brake the motor and a rewinding mode to rotate the motor in reverse, said switch means being arranged to switch to the braking mode upon detection by the first detection means, to the winding mode upon detection by the second detection means, and to the rewinding mode upon detection by the third detection means.
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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |