US3763755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor-driven system for a still camera
Assignee: Minolta Co Ltd
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Filing: 1971-10-28
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Granted: 1973-10-09
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Expires: 1991-10-28
Abstract
Abstract In a motor-driven system for a still camera provided with a motor for advancing a film and cocking the shutter, with an electromagnet for controlling the shutter and with a network for controlling said motor and said electromagnet, an electronic circuit portion of the network is fed by one battery having a substantially constant-voltage but of small capacity, such as a mercury battery, and the electromagnet and the motor are fed by another battery of larger less expensive capacity, but having a voltage characteristic less constant than the one battery, such as manganese battery, so that the delicate electronic circuit portion has a substantially lengthy operating period.
Inventors
- 👤 Y Kuramoto
- 👤 K Tsujimoto
- 👤 T Kobori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:40
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
In a motor-driven system for a still camera which comprises a motor for advancing the film and for cocking the shutter, a motor-controlling network, an electromagnet for controlling the closing of the shutter, and an electronic timer circuit for controlling said electromagnet, said electronic timer circuit having a capacitance-resistance timer circuit and a semiconductor switching circuit responsive to said capacitance-resistance timer circuit for controlling said electromagnet after a delay period determIned by said capacitance-resistance timer circuit, the improvement wherein said motor, said motor-controlling network and said electromagnet are connected to be fed from a large capacity battery, while said electronic circuit is connected to be fed from a battery having a smaller capacity than said large capacity battery and having a constant voltage characteristic.
Claim 2
Dependent Claim
124 words
In a motor-driven system for a still camera which comprises a motor for advancing the film and for cocking the shutter, a motor-controlling network, an electromagnet for controlling the closing of the shutter, and an electronic timer circuit for controlling said electromagnet, said electronic timer circuit having a capacitance-resistance timer circuit and a semiconductor switching circuit responsive to said capacitance-resistance timer circuit for controlling said electromagnet after a delay period determIned by said capacitance-resistance timer circuit, the improvement wherein said motor, said motor-controlling network and said electromagnet are connected to be fed from a large capacity battery, while said electronic circuit is connected to be fed from a battery having a smaller capacity than said large capacity battery and having a constant voltage characteristic.
Claim 3
Dependent Claim
21 words
A motor-driven system for a still camera according to claim 1, wherein said large battery is installed in a replaceable manner.
Claim 4
Dependent Claim
72 words
A motor-driven system for a still camera according to claim 2, wherein said motor, said motor-controlling network and said large capacity battery are installed in a grip handle which is detachable from the camera, while said electromagnet and said electronic timer circuit are installed in the camera, said electromagnet being connected through a selection switch to the larger battery or to the smaller battery, so that either battery alternatively feed the electromagnet.
Claim 5
Dependent Claim
59 words
A motor-driven system for a still camera according to claim 1, wherein said motor-controlling network comprises a relay operated first switch, switchably connected between said motor and said large battery, and second and third switches switchably connecting the relay coil of said relay operated first switch across said large battery in response to a predetermined operation of said camera.
Claim 6
Dependent Claim
67 words
A motor-driven system for a still camera according to claim 4, wherein said network further comprises a semiconductor switching device connected across respective contacts of said second and third switches for providing an energizing path from said large battery to said relay coil in response to the closing of the shutter, and means for triggering said semiconductor switching device in response to the closing of the shutter.
Claim 7
Dependent Claim
79 words
A motor-driven system for a still camera according to claim 5, wherein said semiconductor switching circuit of said electronic timer circuit comprises a Schmitt trigger circuit and an electromagnet-energizing transistor connected in series, responsive to the output of said resistance-capacitance timer circuit for supplying an energizing signal to said electromagnet, and a fourth switch connected between said electromagnet and said large battery for connecting said electromagnet to said battery in response to the activation of a camera release switch.
Claim 8
Dependent Claim
30 words
A motor-driven system for a still camera according to claim 6, further comprising a fifth switch coupled to said electromagnet for selectively connecting said electromagnet to one of said batteries.
Claim 9
Dependent Claim
84 words
A motor-driven system for a still camera according to claim 7, wherein said resistance-capacitance circuit comprises a capacitor and a variable resistor connected in series across said smaller battery and further including an additional switch connected in parallel with said capacitor, said additional switch being opened in response to the opening of the shutter to start the charging of said capacitor, the common connection point of the capacitor and resistor in said resistance-capacitance network being connected to the input of said Schmitt trigger circuit.
Claim 10
Dependent Claim
43 words
A motor-driven system for a still camera according to claim 1, wherein said capacitance-resistance timer circuit includes a variable resistor and said electromagnet controls the shutter for controlling the exposure time of the film in accordance with output of the electronic timer circuit.
References Cited (Backward Citations)
US3434405A
Cited
US3594747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |