Patent US5446900A successfully refreshed from Google Patents.
Patent US4563070A successfully refreshed from Google Patents.
US4563070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure control apparatus
Assignee: Canon Inc
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Filing: 1983-12-27
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Granted: 1986-01-07
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Expires: 2003-12-27
Abstract
Abstract An exposure control apparatus including a diaphragm for controlling the exposure on a focal plane, a light metering element for measuring the light passing through an aperture of the diaphragm, a servo control circuit for controlling the size of the aperture in response to 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 to control the amount of light of a flash device.
Inventors
- 👤 Syuichiro Saito
- 👤 Tadashi Okino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:23
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
An exposure control apparatus comprising: (a) diaphragm means having an aperture and arranged for controlling the amount of an exposure on a focal plane; (b) light metering means for metering light through the aperture of said diaphragm means; (c) control means for servo controlling said aperture by an output of said light metering means; (d) signal output means for producing a signal for controlling the amount of light emitted from a flash device; and (e) changeover means for directing an output of said light metering means to either one of said control means and said signal output means.
Claim 2
Dependent Claim
98 words
An exposure control apparatus comprising: (a) diaphragm means having an aperture and arranged for controlling the amount of an exposure on a focal plane; (b) light metering means for metering light through the aperture of said diaphragm means; (c) control means for servo controlling said aperture by an output of said light metering means; (d) signal output means for producing a signal for controlling the amount of light emitted from a flash device; and (e) changeover means for directing an output of said light metering means to either one of said control means and said signal output means.
Claim 3
Dependent Claim
16 words
An exposure control apparatus according to claim 1, wherein said light metering means includes an SPC.
Claim 4
Dependent Claim
42 words
An apparatus according to claim 1, further comprising; setting means for setting an aperture opening of said diaphragm means at a presecribed value in response to said changeover means directing the output of said light metering means to said signal output means.
Claim 5
Dependent Claim
148 words
An exposure control apparatus for use with a flash device comprising: (a) diaphragm means for controlling the amount of an exposure on a focal plane; (b) light metering means for metering light through an aperture of said diaphragm means; (c) comparing means for comparing an output of said light metering means with a prescribed reference level; (d) control means for controlling said diaphragm means so as to equalize the reference level of said comparing means and the output of said light metering means; (e) integrating means for integrating the output of said light metering means; (f) signal output means responsive to the output of said integrating means rising above a prescribed level for producing a signal to stop firing of a flash device; and (g) changeover means for directing the output of said light metering means to either one of said control means and said signal output means.
Claim 6
Dependent Claim
148 words
An exposure control apparatus for use with a flash device comprising: (a) diaphragm means for controlling the amount of an exposure on a focal plane; (b) light metering means for metering light through an aperture of said diaphragm means; (c) comparing means for comparing an output of said light metering means with a prescribed reference level; (d) control means for controlling said diaphragm means so as to equalize the reference level of said comparing means and the output of said light metering means; (e) integrating means for integrating the output of said light metering means; (f) signal output means responsive to the output of said integrating means rising above a prescribed level for producing a signal to stop firing of a flash device; and (g) changeover means for directing the output of said light metering means to either one of said control means and said signal output means.
Claim 7
Dependent Claim
14 words
An apparatus according to claim 4, wherein said light metering means includes an SPC.
Claim 8
Dependent Claim
42 words
An apparatus according to claim 4, further comprising: setting means for setting the aperture opening of said diaphragm means at a prescribed value in response to said changeover means directing the output of said light metering means to said signal output means.
Claim 9
Dependent Claim
143 words
An exposure control apparatus comprising: (a) diaphragm means for controlling the amount of an exposure on a focal plane; (b) light metering means for metering light passed through an aperture of said diaphragm means; (c) control means responsive to an output of said light metering means for producing a signal for controlling said aperture; (d) signal output means responsive to the output of said light metering means for producing an output signal to control the amount of light emitted from a flash device; (e) changeover means for directing the output of said light metering means to either one of said control means and said signal output means; and (f) setting means for setting the aperture opening of said diaphragm means at a prescribed value in response to said changover means directing the output of said light metering means to said signal output means.
Claim 10
Dependent Claim
143 words
An exposure control apparatus comprising: (a) diaphragm means for controlling the amount of an exposure on a focal plane; (b) light metering means for metering light passed through an aperture of said diaphragm means; (c) control means responsive to an output of said light metering means for producing a signal for controlling said aperture; (d) signal output means responsive to the output of said light metering means for producing an output signal to control the amount of light emitted from a flash device; (e) changeover means for directing the output of said light metering means to either one of said control means and said signal output means; and (f) setting means for setting the aperture opening of said diaphragm means at a prescribed value in response to said changover means directing the output of said light metering means to said signal output means.
Claim 11
Dependent Claim
14 words
An apparatus according to claim 7, wherein said light metering means includes an SPC.
Claim 12
Dependent Claim
28 words
An apparatus according to claim 7, wherein said control means servo controls the aperture of said diaphragm means in accordance with the output of said light metering means.
References Cited (Backward Citations)
US4426142A
Cited
US4327978A
Cited
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 |