US4695894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure control apparatus
Assignee: Canon Inc
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Filing: 1985-05-10
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Granted: 1987-09-22
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Expires: 2005-05-10
Abstract
Abstract An exposure control apparatus including a diaphragm for controlling the exposure amount on a focal plane, a light metering element for measuring the light passing through an aperture opening of the diaphragm, a servo control circuit for servo controlling the size of the aperture opening by the output of the light metering element, and a signal forming circuit receptive of the output of the light metering element for producing an output signal for controlling the light amount of a flash device.
Inventors
- 👤 Syuichiro Saito
- 👤 Tadashi Okino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:04
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/16
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
71 words
An image pick-up apparatus, comprising: (a) image receiving means for pick-up an image of an object; (b) light metering means for detecting the brightness of the object; (c) illumination means for illuminating the object; (d) restriction means for restricting the amount of light incidence on the image pick-up means; and (e) changeover means for using an output of the light metering means selectively for the illumination means or the restriction means.
Claim 2
Dependent Claim
71 words
An image pick-up apparatus, comprising: (a) image receiving means for pick-up an image of an object; (b) light metering means for detecting the brightness of the object; (c) illumination means for illuminating the object; (d) restriction means for restricting the amount of light incidence on the image pick-up means; and (e) changeover means for using an output of the light metering means selectively for the illumination means or the restriction means.
Claim 3
Dependent Claim
24 words
An image pick-up apparatus according to claim 1, in which the image pick-up means includes means for converting the image into an electric signal.
Claim 4
Dependent Claim
20 words
An image pick-up apparatus according to claim 1, in which the image pick-up means includes means for recording the image.
Claim 5
Dependent Claim
18 words
An image pick-up apparatus according to claim 1, in which the light metering means includes light receiving means.
Claim 6
Dependent Claim
17 words
An image pick-up apparatus according to claim 4, in which the light receiving means includes an SPC.
Claim 7
Dependent Claim
17 words
An image pick-up apparatus according to claim 1, in which the illumination means includes flash firing means.
Claim 8
Dependent Claim
25 words
An image pick-up apparatus according to claim 6, in which the flash firing means includes means for stopping the flash firing with a predetermined timing.
Claim 9
Dependent Claim
16 words
An image pick-up apparatus according to claim 1, in which the restriction means includes a diaphragm.
Claim 10
Dependent Claim
16 words
An image pick-up apparatus according to claim 1, in which the changeover means includes a switch.
Claim 11
Dependent Claim
42 words
An image pick-up apparatus according to claim 1, which further comprises: means for controlling the operations of the restriction means and the illumination means by using an output of the light metering means selectively for the restriction means or the illumination means.
Claim 12
Dependent Claim
29 words
An image pick-up apparatus according to claim 10, in which the control means is arranged to control the restriction of the amount of light incidence by the restriction means.
Claim 13
Dependent Claim
27 words
An image pick-up apparatus accoring to claim 10, in which the control means are arranged for controlling the illumination amount of the object by the illumination means.
Claim 14
Dependent Claim
100 words
An image pick-up apparatus, comprising: (a) image pick-up means for pick-up an image of an object; (b) detection means for detecting the brightness of the object; (c) changeover means; (d) first means for controlling the amount of light incident on the image pick-up means in correspondence to an output of the detection means when the changeover means is in a first state; and (e) a second means for controlling the amount of illumination on the object in correspondence to an output of the detection means when the changeover means is in a second state, said second means including flash means.
Claim 15
Dependent Claim
100 words
An image pick-up apparatus, comprising: (a) image pick-up means for pick-up an image of an object; (b) detection means for detecting the brightness of the object; (c) changeover means; (d) first means for controlling the amount of light incident on the image pick-up means in correspondence to an output of the detection means when the changeover means is in a first state; and (e) a second means for controlling the amount of illumination on the object in correspondence to an output of the detection means when the changeover means is in a second state, said second means including flash means.
Claim 16
Dependent Claim
24 words
An image pick-up apparatus according to claim 13, in which the image pick-up means includes means for converting the image into an electric signal.
Claim 17
Dependent Claim
20 words
An image pick-up apparatus according to claim 13, in which the image pick-up means includes means for recording the image.
Claim 18
Dependent Claim
17 words
An image pick-up apparatus according to claim 13, in which the detection means includes light receiving means.
Claim 19
Dependent Claim
16 words
An image pick-up apparatus according to claim 13, in which the first means includes a diaphragm.
References Cited (Backward Citations)
US4037234A
Cited
US4426142A
Cited
US4118716A
Cited
US4366501A
Cited
US4327978A
Cited
US4300167A
Cited
US4509847A
Cited
US4563070A
Cited
US4558368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |