US4965620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera
Assignee: Nikon Corp
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Filing: 1989-05-10
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Granted: 1990-10-23
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Expires: 2009-05-10
Abstract
Abstract A camera is adapted so that a light emission level of a flashing apparatus is automatically corrected through the comparison of the control value with the appropriate exposure for the constant illumination (background illumination). As a result, an appropriate exposure can be given for the principal object, such as a person, even when the exposure for the constant illumination is outside the exposure control range or is intentionally decreased or increased.
Inventors
- 👤 Tadao Takagi
- 👤 Toshihiro Sato
- 👤 Takashi Saegusa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:56
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/16; G03B7/08; G03B7/099; G03B7/0993; G03B7/0997; G03B7/09971; G03B7/09974; G03B7/09979
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
160 words
A camera comprising: (a) light metering means; (b) appropriate luminance calculating means for calculating an appropriate luminance on the basis of the output of said light metering means and producing an appropriate luminance signal; (c) exposure control means; (d) control luminance calculating means for calculating a control luminance corresponding to an exposure value controlled by said exposure control means; (e) discrimination means for comparing said appropriate luminance with said control luminance; (f) flash light emission means for emitting flash light toward an object; (g) determination means for determining a control level on the basis of the output of said light metering means; (h) correction means for correcting said control level on the basis of the result of comparison by said discrimination means; and (i) flash light control means for controlling the termination of the flash emission from said flash light emission means on the basis of said corrected control level and at least a part of light from said object.
Claim 2
Dependent Claim
160 words
A camera comprising: (a) light metering means; (b) appropriate luminance calculating means for calculating an appropriate luminance on the basis of the output of said light metering means and producing an appropriate luminance signal; (c) exposure control means; (d) control luminance calculating means for calculating a control luminance corresponding to an exposure value controlled by said exposure control means; (e) discrimination means for comparing said appropriate luminance with said control luminance; (f) flash light emission means for emitting flash light toward an object; (g) determination means for determining a control level on the basis of the output of said light metering means; (h) correction means for correcting said control level on the basis of the result of comparison by said discrimination means; and (i) flash light control means for controlling the termination of the flash emission from said flash light emission means on the basis of said corrected control level and at least a part of light from said object.
Claim 3
Dependent Claim
26 words
A camera according to claim 1, wherein said discrimination means calculates a difference between the value of said appropriate luminance and that of said control luminance.
Claim 4
Dependent Claim
24 words
A camera according to claim 2, wherein said correction means does not correct said control level when said difference is beyond a predetermined range.
Claim 5
Dependent Claim
51 words
A camera according to claim 3, wherein said flash light control means controls the termination of the flash emission from said flash light emission means on the basis of said control level and at least a part of the light from said object when said difference is beyond a predetermined range.
Claim 6
Dependent Claim
33 words
A camera according to claim 3, wherein said correction means calculates a correction value on the basis of said difference and calculates a corrected control level on the basis of said correction value.
Claim 7
Dependent Claim
22 words
A camera according to claim 5, wherein said correction means multiplies said difference by a predetermined value to calculate said correction value.
Claim 8
Dependent Claim
18 words
A camera according to claim 6, wherein said correction means adds said correction value to said control level.
Claim 9
Dependent Claim
23 words
A camera according to claim 4, wherein said correction means multiplies said control level by a predetermined value to calculate said correction value.
Claim 10
Dependent Claim
30 words
A camera according to claim 1, wherein said correction means corrects said control level when the value of said appropriate luminance is not equal to that of said control luminance.
Claim 11
Dependent Claim
29 words
A camera according to claim 1, wherein said correction means corrects said control level when the value of said appropriate luminance is smaller than that of said control luminance.
Claim 12
Dependent Claim
39 words
A camera according to claim 1, wherein said light metering means meters light intensity of each of a plurality of areas of said object and produces an output which indicates light intensity of each of said plurality of areas.
References Cited (Backward Citations)
US4589756A
Cited
US4809030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |