US4720720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor-driven film winder for cameras
Assignee: Ricoh Optical Industries Co Ltd
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Filing: 1985-09-18
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Granted: 1988-01-19
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Expires: 2005-09-18
Abstract
Abstract A motor-driven film winder for use with a camera includes an exposure inhibit signal generator for generating an exposure inhibit signal when the number of frames to be exposed which is set by an exposure setting unit coincides with the number of exposed frames counted by a counter. The motor-driven film winder also has an unexposed frame indicator for indicating the difference between the number of frames set by the exposure setting unit and the count of the counter as the number of remaining unexposed frames when a shutter release operation of the camera is interrupted before the count of the counter reaches the preset number of frames to be exposed, and an intermittent exposure canceling signal generator for issuing an intermittent exposure cancelling signal to an intermittent exposure signal generator when the preset number of frames to be exposed coincides with the counter of the counter.
Inventors
- 👤 Kunihiko Araki
- 👤 Tomoya Kitajima
- 👤 Yoshio Serikawa
- 👤 Mikio Kobayashi
- 👤 Hiroshi Terui
- 👤 Kenji Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:47
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/60; G03B1/62; G03B17/00; G03B17/36; G03B17/42; G03B17/425
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
104 words
A motor-driven film winder for use with a camera, comprising: a film winding motor energizable in response to an exposure end signal generated from the camera each time an exposure cycle ends; a counter for counting said exposure end signal, or a drive signal for driving said film winding motor, or a film winding completion signal; exposure setting means for setting the number of frames to be exposed by the camera; and exposure inhibit signal generating means for issuing an exposure inhibit signal to said camera when the number of frames set by said exposure setting means coincides with the count of said counter.
Claim 2
Dependent Claim
104 words
A motor-driven film winder for use with a camera, comprising: a film winding motor energizable in response to an exposure end signal generated from the camera each time an exposure cycle ends; a counter for counting said exposure end signal, or a drive signal for driving said film winding motor, or a film winding completion signal; exposure setting means for setting the number of frames to be exposed by the camera; and exposure inhibit signal generating means for issuing an exposure inhibit signal to said camera when the number of frames set by said exposure setting means coincides with the count of said counter.
Claim 3
Dependent Claim
25 words
A motor-driven film winder according to claim 1, wherein said counter can be reset by the off-state of a release signal issued from said camera.
Claim 4
Dependent Claim
44 words
A motor-driven film winder according to claim 1, wherein said counter can be reset by the off-state of a power signal issued from said camera insofar as the number of frames set by said exposure setting means coincides with the count of said counter.
Claim 5
Dependent Claim
18 words
A motor-driven film winder according to claim 1, wherein said counter can be reset by a manually-operated switch.
Claim 6
Dependent Claim
70 words
A motor-driven film winder according to claim 1, further including an unexposed frame indicating means for indicating the difference between the number of frames set by said exposure setting means and the count of said counter as the number of remaining unexposed frames when a shutter release operation of the camera is interrupted before the count of said counter reaches the number of frames set by said exposure setting means.
Claim 7
Dependent Claim
44 words
A motor-driven film winder according to claim 5, wherein said counter can be reset by the off-state of a power signal issued from said camera insofar as the number of frames set by said exposure setting means coincides with the count of said counter.
Claim 8
Dependent Claim
31 words
A motor-driven film winder according to claim 5, wherein said unexposed frame indicating means comprises means for emitting light or sound as many times as the number of remaining unexposed frames.
Claim 9
Dependent Claim
221 words
A camera and a motor-driven film winder for use with a camera, comprising: a motor for winding a film to allow the camera to automatically take pictures at a prescribed interval; exposure control means responsive to an exposure signal for determining appropriate exposure conditions to effect exposure operation; intermittent exposure signal generating means for setting an exposure time interval response to external operation and for issuing an intermittent exposure signal at said set exposure time interval, said intermittent exposure signal generating means being de-energizable in response to an intermittent exposure canceling signal; motor control means responsive to the completion of the exposure operation effected by said exposure control means for energizing said motor and also substantially responsive to the completion of film winding operation for de-energizing said motor; a counter for counting an exposure end signal, a motor drive signal, or a film winding completion signal; exposure setting means for setting the number of frames to be exposed by said camera; exposure inhibit signal generating means for issuing an exposure inhibit signal to said camera when the number of frames set by said exposure setting means coincides with the count of said counter; and intermittent exposure canceling signal generating means for issuing an intermittent exposure canceling signal to said intermittent exposure signal generating means in response to said exposure inhibit signal.
Claim 10
Dependent Claim
221 words
A camera and a motor-driven film winder for use with a camera, comprising: a motor for winding a film to allow the camera to automatically take pictures at a prescribed interval; exposure control means responsive to an exposure signal for determining appropriate exposure conditions to effect exposure operation; intermittent exposure signal generating means for setting an exposure time interval response to external operation and for issuing an intermittent exposure signal at said set exposure time interval, said intermittent exposure signal generating means being de-energizable in response to an intermittent exposure canceling signal; motor control means responsive to the completion of the exposure operation effected by said exposure control means for energizing said motor and also substantially responsive to the completion of film winding operation for de-energizing said motor; a counter for counting an exposure end signal, a motor drive signal, or a film winding completion signal; exposure setting means for setting the number of frames to be exposed by said camera; exposure inhibit signal generating means for issuing an exposure inhibit signal to said camera when the number of frames set by said exposure setting means coincides with the count of said counter; and intermittent exposure canceling signal generating means for issuing an intermittent exposure canceling signal to said intermittent exposure signal generating means in response to said exposure inhibit signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |