Patent US4563069A successfully refreshed from Google Patents.
US4563069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for carrying out focus detection and light measurement of a camera
Assignee: Canon Inc
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Filing: 1985-01-10
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Granted: 1986-01-07
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Expires: 2005-01-10
Abstract
Abstract Disclosed is a control system for carrying out the focus detection and the light measurement of a camera by means of which after the termination of the exposure the next focus detection and the next light measurement are controlled systematically so as to be started at a proper timing respectively in such a manner that the next focus detection and the next light measurement is prohibited before the diaphragm in the exposure state is brought back into the stationary state, in order to prevent the misoperation.
Inventors
- 👤 Shinji Sakai
- 👤 Takashi Kawabata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:37
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/36; G03; G03B; G03B7/00; G03B7/08; G03B7/091; G03B7/093
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
201 words
A control system for carrying out focus detection and light measuring of a camera comprising: (a) light measuring means for measuring the light passing the photographing lens of the camera; (b) focus signal producing means for detecting the light passing the photographing lens of the camera so as to produce a focus signal; (c) exposure-in-progress signal generating means for producing a signal representing that an exposure is being made; (d) first prohibiting means for prohibiting the operation of said light measuring means; (e) second prohibiting means for prohibiting the operation of the focus signal producing means; and (f) time means responsive to detection of the termination of the film exposure by the signal produced from said exposure-in-progress signal generating means for starting time count, said timer means having: (A) a first terminal for carrying an output signal of suitable duration for rendering said first prohibiting means operative to prohibit said light measuring means from being substantially driven; and (B) a second terminal for carrying an output signal of suitable duration for rendering said second prohibiting means operative to prohibit said focus signal-producing means from being substantially driven, said duration being longer than that of the signal produced at the first terminal.
Claim 2
Dependent Claim
201 words
A control system for carrying out focus detection and light measuring of a camera comprising: (a) light measuring means for measuring the light passing the photographing lens of the camera; (b) focus signal producing means for detecting the light passing the photographing lens of the camera so as to produce a focus signal; (c) exposure-in-progress signal generating means for producing a signal representing that an exposure is being made; (d) first prohibiting means for prohibiting the operation of said light measuring means; (e) second prohibiting means for prohibiting the operation of the focus signal producing means; and (f) time means responsive to detection of the termination of the film exposure by the signal produced from said exposure-in-progress signal generating means for starting time count, said timer means having: (A) a first terminal for carrying an output signal of suitable duration for rendering said first prohibiting means operative to prohibit said light measuring means from being substantially driven; and (B) a second terminal for carrying an output signal of suitable duration for rendering said second prohibiting means operative to prohibit said focus signal-producing means from being substantially driven, said duration being longer than that of the signal produced at the first terminal.
Claim 3
Dependent Claim
26 words
A system according to claim 1, further comprising lens driving means for carrying out the focusing operation with the output of the focus signal producing means.
Claim 4
Dependent Claim
24 words
A system according to claim 1, further comprising display means for displaying the focussing state with the output of the focus signal producing means.
Claim 5
Dependent Claim
26 words
A system according to claim 1, further comprising automatic exposure control means for carrying out the exposure control with the output of the light measurement means.
Claim 6
Dependent Claim
99 words
A system according to claim 1, wherein exposure-in-progress signal generating means includes: (A) a quick return mirror for directing the light passing through a photographic objective of the aforesaid camera to said focus signal producing means; (B) switching means arranged to cooperate with said quick return mirror in such a manner that for assuming a first state when said quick return mirror is in a viewing position, and for assuming a second state when it is in a film exposing position a second; and (C) means for producing a signal when said switch means is in the second state.
Claim 7
Dependent Claim
89 words
A system according to claim 1, wherein the exposure-in-progress signal generating means includes: (A) a shutter release member; (B) detecting means responsive to actuation of said shutter release member for initiating an exposure; and (C) timer means arranged upon detection of the actuation of said shutter release member by said detecting means to start counting of a time depending on the output of said light measuring means with the generating of a film exposure-in-progress signal, and upon termination of duration of the counting time to stop the film exposure.
Claim 8
Dependent Claim
19 words
A system according to claim 6, wherein the exposure-in-progress signal producing means is a clock generator and a counter.
Claim 9
Dependent Claim
24 words
A system according to claim 6, wherein the exposure-in-progress signal producing means is a time constant circuit making use of the CR time constant.
Claim 10
Dependent Claim
25 words
A system according to claim 6, further comprising lens driving means for carrying out the focussing operation with the output of the distance measurement means.
Claim 11
Dependent Claim
23 words
A system according to claim 6, further comprising display means for displaying the focussing state with the output of the distance measurement means.
Claim 12
Dependent Claim
26 words
A system according to claim 6, further comprising automatic exposure control means for carrying out the exposure control with the output of the light measurement means.
Claim 13
Dependent Claim
143 words
A control system for carrying out the focus detection and the light measurement of a camera comprising: (a) light measurement means, said means producing a signal necessary for the exposure control of the camera; (b) focus detection means, said means producing a signal necessary for the focus detection of the camera; and (c) exposure signal producing means, said means producing a certain determined signal during the exposure time; (d) light measurement prohibiting means, said means prohibiting the light measurement during a certain determined time after the exposure termination, said exposure termination in response to the signal from the exposure signal producing means; and (e) focus detection prohibiting means, said means prohibiting the focus detection during a certain determined time longer than the above determined time after the exposure termination, said exposure termination in response to the signal from the exposure signal producing means.
Claim 14
Dependent Claim
143 words
A control system for carrying out the focus detection and the light measurement of a camera comprising: (a) light measurement means, said means producing a signal necessary for the exposure control of the camera; (b) focus detection means, said means producing a signal necessary for the focus detection of the camera; and (c) exposure signal producing means, said means producing a certain determined signal during the exposure time; (d) light measurement prohibiting means, said means prohibiting the light measurement during a certain determined time after the exposure termination, said exposure termination in response to the signal from the exposure signal producing means; and (e) focus detection prohibiting means, said means prohibiting the focus detection during a certain determined time longer than the above determined time after the exposure termination, said exposure termination in response to the signal from the exposure signal producing means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |