US3804499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion picture camera controls
Assignee: Yashica Co Ltd
•
Filing: 1973-04-09
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Granted: 1974-04-16
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Expires: 1993-04-09
Abstract
Abstract A motion picture camera having an electromagnet which is energized only briefly in order to stop the operation of the camera. The camera is capable of being operated both continuously or in a single-frame mode. Also, the camera includes for starting and stopping purposes, a simple switch having only a pair of terminals bridged by a single switch blade. The circuitry which connects the above components is such that the electromagnet is briefly energized upon opening of a start-stop switch in order to terminate operation of the camera motor as well as to automatically bring about deenergizing of the electromagnet with the camera motor being capable of resuming its operation only upon closing of the start-stop switch.
Inventors
- 👤 T Higuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:59
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425; G03B21/00; G03B21/14; G03B21/32; G03B21/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
249 words
In a motion picture camera, an electrical driving motor, normally closed control switch means having open and closed positions and being electrically connected with said motor for permitting the latter to operate only when said control switch means is in said closed position, electromagnetic means positioned with respect to said control switch means for urging the latter to its open position when said electromagnetic means is energized, said control switch means being electrically connected with said electromagnetic means for permitting energizing thereof only when said control switch means is in its closed position so that said control switch means returns to its closed position immediately after being in its open position, start-stop switch means electrically connected with said motor for starting the latter upon closing of said start-stop switch means and for at least initiating conditions for terminating operation of said motor upon opening of said start-stop switch means, and circuit means electrically connected between said start-stop switch means and said electromagnetic means for energizing the latter upon opening of said start-stop switch means and for preventing starting of said motor until said startstop switch means is closed, whereby upon opening of said startstop switch means said electromagnetic means will become energized to bring about opening of said control switch means to terminate the operation of the motor and to deenergize said electromagnetic means, so that said control switch means immediately resumes its closed position while said motor cannot resume its operation until said start-stop switch means is closed.
Claim 2
Dependent Claim
249 words
In a motion picture camera, an electrical driving motor, normally closed control switch means having open and closed positions and being electrically connected with said motor for permitting the latter to operate only when said control switch means is in said closed position, electromagnetic means positioned with respect to said control switch means for urging the latter to its open position when said electromagnetic means is energized, said control switch means being electrically connected with said electromagnetic means for permitting energizing thereof only when said control switch means is in its closed position so that said control switch means returns to its closed position immediately after being in its open position, start-stop switch means electrically connected with said motor for starting the latter upon closing of said start-stop switch means and for at least initiating conditions for terminating operation of said motor upon opening of said start-stop switch means, and circuit means electrically connected between said start-stop switch means and said electromagnetic means for energizing the latter upon opening of said start-stop switch means and for preventing starting of said motor until said startstop switch means is closed, whereby upon opening of said startstop switch means said electromagnetic means will become energized to bring about opening of said control switch means to terminate the operation of the motor and to deenergize said electromagnetic means, so that said control switch means immediately resumes its closed position while said motor cannot resume its operation until said start-stop switch means is closed.
Claim 3
Dependent Claim
64 words
The combination of claim 1 and wherein a blocking means coacts with said normally closed control switch means for blocking the same against movement to said open position thereof until a shutter of the camera is in a predetermined angular position, so that deenergizing of said electromagnetic means and stopping of said motor occur only when the camera shutter reaches said angular position thereof.
Claim 4
Dependent Claim
68 words
The combination of claim 2 and wherein said blocking means is mechanical and includes a rotary cam having a periphery engaging said normally closed control switch means to maintain the latter closed, said cam being formed at its periphery with a notch for receiving part of said normally closed control switch means to release the latter to be opened by said electromagnetic means when the latter is energized.
Claim 5
Dependent Claim
30 words
The combination of claim 1 and wherein said start-stop switch means includes only a pair of terminals bridged by a single switch blade when said start-stop switch means is closed.
Claim 6
Dependent Claim
69 words
The combination of claim 1 and wherein said circuit means includes a capacitor means electrically connected between said start-stop switch means and said electromagnetic means for retaining upon opening of said start-stop switch means a charge sufficient to energize said electromagnetic means and said start-stop switch means being connected across said capacitor means to prevent the latter from energizing said electromagnetic means when said start-stop switch means is closed.
Claim 7
Dependent Claim
21 words
The combination of claim 1 and wherein said circuit means includes a selecting switch means for selecting continuous or single-frame operation.
Claim 8
Dependent Claim
36 words
The combination of claim 6 and wherein said circuit means energizes both said motor and said electromagnetic means when said selecting switch means is positioned for selecting single-frame operation, upon closing of said start-stop switch means.
Claim 9
Dependent Claim
36 words
The combination of claim 7 and wherein a delay means is electrically connected with said electromagnetic means for delaying energizing of the latter until a given interval has elapsed after the motor has started to operate.
Claim 10
Dependent Claim
30 words
The combination of claim 1 and wherein an SCR is electrically connected with said electromagnetic means and forms part of said circuit means for controlling energizing of said electromagnetic means.
Claim 11
Dependent Claim
54 words
The combination of claim 1 and wherein said circuit means includes a capacitor means for retaining a charge sufficient to energize said electromagnetic means upon opening of said start-stop switch means, and a transistor connected across said start-stop switch means between the latter and said capacitor means for controlling the operation of the latter.
References Cited (Backward Citations)
US2679186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |