Patent US4458996A successfully refreshed from Google Patents.
US4458996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic operation control circuit for camera
Assignee: Canon Inc
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Filing: 1979-12-20
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Granted: 1984-07-10
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Expires: 1999-12-20
Abstract
Abstract In the disclosed camera exposure control, data recording and film winding are performed sequentially and the system is protected from battery voltage drop arising from the effective increase in consumption of electrical energy necessary to make each exposure as compared with the ordinary camera, by detecting the battery level upon occurrence of a prescribed phase of the operating cycle. In one embodiment, the battery is also checked at a subsequent step of the cycle (for example, film winding operation is permitted only when the battery level is above the predetermined level). According to an embodiment of the invention, a sequence control circuit controls the photographic operation sequentially.
Inventors
- 👤 Isao Harigaya
- 👤 Shuichi Tamura
- 👤 Mutsuhide Matsuda
- 👤 Michio Hirohata
- 👤 Fumio Ito
- 👤 Tetsuya Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:13
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/36; G03; G03B; G03B17/00; G03B17/18; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
A camera for controlling at least an exposure operation and a film winding operation, comprising: (a) a control circuit connectable to a power supply source and having an exposure control circuit for controlling the exposure operation and a film winding circuit for controlling the film winding operation; (b) a voltage detection circuit for detecting the voltage of the power supply source, said voltage detection circuit being arranged to become operative upon completion of the exposure operation by the exposure control circuit and to become inoperative before the film winding operation begins; and (c) warning means for producing a warning when a drop in voltage is detected by the voltage detection circuit.
Claim 2
Dependent Claim
111 words
A camera for controlling at least an exposure operation and a film winding operation, comprising: (a) a control circuit connectable to a power supply source and having an exposure control circuit for controlling the exposure operation and a film winding circuit for controlling the film winding operation; (b) a voltage detection circuit for detecting the voltage of the power supply source, said voltage detection circuit being arranged to become operative upon completion of the exposure operation by the exposure control circuit and to become inoperative before the film winding operation begins; and (c) warning means for producing a warning when a drop in voltage is detected by the voltage detection circuit.
Claim 3
Dependent Claim
69 words
A camera comprising: (a) an exposure control circuit connectable to a power source for controlling an exposure; (b) a voltage detecting circuit for detecting the voltage of the power source, said detecting circuit being arranged to become operative upon completion of an exposure control operation by the exposure control circuit; and (c) warning means for giving a warning when a drop in voltage is detected by said detecting circuit.
Claim 4
Dependent Claim
69 words
A camera comprising: (a) an exposure control circuit connectable to a power source for controlling an exposure; (b) a voltage detecting circuit for detecting the voltage of the power source, said detecting circuit being arranged to become operative upon completion of an exposure control operation by the exposure control circuit; and (c) warning means for giving a warning when a drop in voltage is detected by said detecting circuit.
Claim 5
Dependent Claim
112 words
A camera comprising: (a) a shutter time control circuit for performing a shutter time control operation so as to control the shutter time; (b) a film winding circuit connectable to a power source for performing a film winding operation and for becoming operative after the shutter time control operation of said shutter time control circuit has finished; (c) a voltage detecting circuit for detecting the voltage from the power source and for becoming operative after the shutter time control operation has finished; and (d) inhibiting means for inhibiting actuation of said film winding circuit when a drop in the voltage of the power supply source is detected by said voltage detecting circuit.
Claim 6
Dependent Claim
112 words
A camera comprising: (a) a shutter time control circuit for performing a shutter time control operation so as to control the shutter time; (b) a film winding circuit connectable to a power source for performing a film winding operation and for becoming operative after the shutter time control operation of said shutter time control circuit has finished; (c) a voltage detecting circuit for detecting the voltage from the power source and for becoming operative after the shutter time control operation has finished; and (d) inhibiting means for inhibiting actuation of said film winding circuit when a drop in the voltage of the power supply source is detected by said voltage detecting circuit.
Claim 7
Dependent Claim
75 words
A voltage detection device for a camera which sequentially controls the various kinds of photographic operations comprising: (a) a voltage detection circuit for detecting the voltage from a power supply source; (b) a control circuit for rendering said voltage detection circuit operative upon completion of one photographic operation and inoperative before another photographic operation begins; and (c) warning means for performing a warning operation when a voltage drop is detected by said voltage detection circuit.
Claim 8
Dependent Claim
75 words
A voltage detection device for a camera which sequentially controls the various kinds of photographic operations comprising: (a) a voltage detection circuit for detecting the voltage from a power supply source; (b) a control circuit for rendering said voltage detection circuit operative upon completion of one photographic operation and inoperative before another photographic operation begins; and (c) warning means for performing a warning operation when a voltage drop is detected by said voltage detection circuit.
Claim 9
Dependent Claim
113 words
A camera for controlling at least exposure and film winding operations, comprising: (a) a control circuit connectable to a power supply source and having an exposure control circuit for controlling the exposure operation and a film winding circuit for controlling the film winding operation; (b) a voltage detection circuit for detecting the voltage of the power supply source, said voltage detecting circuit being arranged to become operative upon completion of the exposure operation by the exposure control circuit and to become inoperative before the film winding operation begins; and (c) inhibiting means for inhibiting the operation of the film winding circuit when a drop in voltage is detected by the voltage detection circuit.
Claim 10
Dependent Claim
113 words
A camera for controlling at least exposure and film winding operations, comprising: (a) a control circuit connectable to a power supply source and having an exposure control circuit for controlling the exposure operation and a film winding circuit for controlling the film winding operation; (b) a voltage detection circuit for detecting the voltage of the power supply source, said voltage detecting circuit being arranged to become operative upon completion of the exposure operation by the exposure control circuit and to become inoperative before the film winding operation begins; and (c) inhibiting means for inhibiting the operation of the film winding circuit when a drop in voltage is detected by the voltage detection circuit.
Claim 11
Dependent Claim
85 words
A voltage detection device for a camera which sequentially controls various kinds of photographic operations, said device comprising: (a) a voltage detection circuit for detecting voltage from a power supply source; (b) a control circuit for rendering said voltage detection circuit operative upon completion of one photographic operation and inoperative before another photographic operation begins; and (c) inhibiting means for inhibiting the operation of said other photographic operation when a drop in voltage of the power supply source is detected by said voltage detection circuit.
Claim 12
Dependent Claim
85 words
A voltage detection device for a camera which sequentially controls various kinds of photographic operations, said device comprising: (a) a voltage detection circuit for detecting voltage from a power supply source; (b) a control circuit for rendering said voltage detection circuit operative upon completion of one photographic operation and inoperative before another photographic operation begins; and (c) inhibiting means for inhibiting the operation of said other photographic operation when a drop in voltage of the power supply source is detected by said voltage detection circuit.
References Cited (Backward Citations)
US4025935A
Cited
US4235538A
Cited
US4126874A
Cited
US4091395A
Cited
US4201463A
Cited
US4269489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |