US5023704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color temperature detecting device wherein comparison is made between color component levels and reference levels which vary with the illuminance of incident light
Assignee: Canon Inc
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Filing: 1989-10-11
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Granted: 1991-06-11
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Expires: 2009-10-11
Abstract
Abstract A color temperature detecting device comprises a plurality of color detectors for detecting levels of a plurality of color components included in light incident thereon, a comparator for comparing levels of the plurality of color components with respective reference levels; a device for detecting the illuminance level of the incident light and a controller for changing the reference levels correspondingly with the detected illuminance level.
Inventors
- 👤 Teruo Hieda
- 👤 Hiroyuki Shimizu
- 👤 Kazunori Masuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:56
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/84; H04N23/88
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A color temperature detecting device, comprising: (a) a plurality of color detecting means for detecting levels of a plurality of color components included in an incident light; (b) comparison means for comparing levels of the plurality of color components with respective reference levels; (c) illuminance detecting means for detecting the illuminance level of said incident light; and (d) control means for changing said reference levels according to the illuminance level detected by said illuminance detecting means.
Claim 2
Dependent Claim
76 words
A color temperature detecting device, comprising: (a) a plurality of color detecting means for detecting levels of a plurality of color components included in an incident light; (b) comparison means for comparing levels of the plurality of color components with respective reference levels; (c) illuminance detecting means for detecting the illuminance level of said incident light; and (d) control means for changing said reference levels according to the illuminance level detected by said illuminance detecting means.
Claim 3
Dependent Claim
34 words
A device according to claim 1, wherein said comparison means is arranged to vary an output thereof according to whether or not the levels of said color components have reached said respective reference levels.
Claim 4
Dependent Claim
25 words
A device according to claim 2, further comprising a plurality of voltage sources which are changed over according to the output of said comparison means.
Claim 5
Dependent Claim
20 words
A device according to claim 3, further comprising smoothing means for smoothing selected outputs of said plurality of voltage sources.
Claim 6
Dependent Claim
100 words
A color image sensing apparatus comprising: (a) color image sensing means for converting an optical image into a plurality of electrical color signals; (b) a color temperature detecting device for detecting a color temperature of incident light, comprising comparison means for comparing levels of a plurality of color components included in said incident light with respective reference levels which are arranged to vary according to an illuminance of said incident light; and (c) control means for controlling the balance of said plurality of electrical color signals relative to each other according to an output of said color temperature detecting device.
Claim 7
Dependent Claim
100 words
A color image sensing apparatus comprising: (a) color image sensing means for converting an optical image into a plurality of electrical color signals; (b) a color temperature detecting device for detecting a color temperature of incident light, comprising comparison means for comparing levels of a plurality of color components included in said incident light with respective reference levels which are arranged to vary according to an illuminance of said incident light; and (c) control means for controlling the balance of said plurality of electrical color signals relative to each other according to an output of said color temperature detecting device.
Claim 8
Dependent Claim
18 words
An apparatus according to claim 5, further comprising detecting means for detecting the illuminance of said incident light.
Claim 9
Dependent Claim
34 words
An apparatus according to claim 5, wherein said comparison means is arranged to vary an output thereof according to whether or not the levels of said color components have reached said respective reference levels.
Claim 10
Dependent Claim
25 words
An apparatus according to claim 5, further comprising a plurality of voltage sources which are changed over according to the output of said comparison means.
Claim 11
Dependent Claim
20 words
An apparatus according to claim 8, further comprising smoothing means for smoothing selected outputs of said plurality of voltage sources.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |