US3840884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor driven winding device for photographic camera
Assignee: Minolta Co Ltd
•
Filing: 1974-02-22
•
Granted: 1974-10-08
•
Expires: 1994-02-22
Abstract
Abstract A motor driven winding device for a photographic camera. An electric motor, which controls the film winding and releasing operations, is selectively connectable to a high voltage circuit, low voltage circuit or braking circuit. When the release operation for causing a continuous photographic process is effected, the electric motor is connected to the high voltage circuit for effecting the winding of the film and the cocking of the shutter. Upon the completion of the film winding and shutter cocking operations, the electric motor is disconnected from the high voltage circuit and in turn connected to the low voltage circuit, thereby rotating at a slower speed which is utilized for driving the shutter release mechanism. After causing the release of the shutter, the electric motor is disconnected from the low voltage circuit and is then connected to the braking circuit and stops. By the application of a signal representing the completion of the exposure by the shutter, the electric motor is disconnected from the braking circuit and in turn again connected to the high voltage circuit. These sequential operations are cyclically repeated. After completion of the continuous series of photographs, the film winding and shutter cocking operations for taking a subsequent photograph, at a later point in time, are effected by the electric motor connected to the low voltage circuit. Upon the termination of the winding operation in this manner, the electric motor is connected to the braking circuit, thereby stopping its driving operation.
Inventors
- 👤 K Umeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:33
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
310 words
In a motor driven winding device for a photographic camera including a winding mechanism for effecting the winding of a film and cocking of a shutter, a shutter release member for releasing the shutter for enabling exposure of the film, a driving motor for driving the winding mechanism and the shutter release member, the driving motor having two input terminals, and a member for energizing the driving motor and effecting a release operation for actuating a continuous photographic process, the improvement wherein the device further comprises: a high voltage circuit including an electric potential source of a high voltage for applying such hIgh voltage to said driving motor; a low voltage circuit including an electric potential source of a low voltage for applying such low voltage to said driving motor; a braking circuit for short-circuiting both of said terminals of said driving motor; first switch means for connecting said low voltage circuit to said driving motor for driving said shutter release member when said release member is actuated; second switch means for cutting off the connection of said driving motor with said low voltage circuit and for connecting said driving motor to said braking circuit, in association with the operation of said shutter release member; third switch means for cutting off the connection between said driving motor and said braking circuit and connecting said driving motor to said high voltage circuit in response to receipt of a signal indicating the completion of the exposure operation of said shutter, thereby driving said winding mechanism; and fourth switch means for cutting off the connection of said driving motor with said high voltage circuit and connecting said driving motor to said low voltage circuit, in association with the termination of winding of one frame of a photographic film and corresponding cocking of the shutter, thereby driving the motor for the shutter release operation.
Claim 2
Dependent Claim
310 words
In a motor driven winding device for a photographic camera including a winding mechanism for effecting the winding of a film and cocking of a shutter, a shutter release member for releasing the shutter for enabling exposure of the film, a driving motor for driving the winding mechanism and the shutter release member, the driving motor having two input terminals, and a member for energizing the driving motor and effecting a release operation for actuating a continuous photographic process, the improvement wherein the device further comprises: a high voltage circuit including an electric potential source of a high voltage for applying such hIgh voltage to said driving motor; a low voltage circuit including an electric potential source of a low voltage for applying such low voltage to said driving motor; a braking circuit for short-circuiting both of said terminals of said driving motor; first switch means for connecting said low voltage circuit to said driving motor for driving said shutter release member when said release member is actuated; second switch means for cutting off the connection of said driving motor with said low voltage circuit and for connecting said driving motor to said braking circuit, in association with the operation of said shutter release member; third switch means for cutting off the connection between said driving motor and said braking circuit and connecting said driving motor to said high voltage circuit in response to receipt of a signal indicating the completion of the exposure operation of said shutter, thereby driving said winding mechanism; and fourth switch means for cutting off the connection of said driving motor with said high voltage circuit and connecting said driving motor to said low voltage circuit, in association with the termination of winding of one frame of a photographic film and corresponding cocking of the shutter, thereby driving the motor for the shutter release operation.
Claim 3
Dependent Claim
55 words
A motor driven winding device for a photographic camera as defined in claim 1, wherein said low voltage electric potential source includes a first electric potential source and said high voltage electric potential source includes said first electric potential source and a second electric potential source connected in series with said first electric potential source.
Claim 4
Dependent Claim
190 words
A motor driven winding device for a photographic camera as defined in claim 1, further comprising: means for transmitting the rotation of said driving motor selectively to the shutter releasing member and the winding mechanism; and, control means for selectively connecting said high voltage circuit, said low voltage circuit and said braking circuit to said driving motor, said control means including: said second switch means having a first switch and a second switch which are actuated by said transmitting means to switch said driving motor from its connection with said low voltage circuit into connection with braking circuit, said third switch means having a third switch actuated in response to receipt of a signal indicating the completion of the exposure operation and switching said driving motor from its connecting with said braking circuit into connection with said high voltage circuit, and means for causing said first switch to return to its initial position in response to further actuation of said transmitting means, for switching said driving motor from its connection with said braking circuit into connection with said high voltage circuit, in association with the termination of the winding operation.
Claim 5
Dependent Claim
156 words
A motor driven winding device for a photographic camera as defined in claim 1, further comprising: control means for selectively connecting said high voltage circuit, said low voltage circuit and said braking circuit to said driving motor for providing the exposure for a subsequent frame of photographic film, after the interruption of the release operation; fifth switch means for cutting off the connection of said driving motor with said braking circuit and connecting said low voltage circuit to said driving motor, when the release operation has been interrupted, for driving the winding mechanism in response to a signal indicating completion of the exposure; and, sixth switch means for cutting off the connection of said driving motor with said low voltage circuit and connecting said braking circuit to said driving motor when the release operation has been interrupted and after the film winding and shutter cocking operations have been finished by the operation of said winding mechanism.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |