US5398058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color image pickup device having color temperature converting filters
Assignee: Canon Inc
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Filing: 1992-07-10
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Granted: 1995-03-14
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Expires: 2012-07-10
Abstract
Abstract A filter member which can alternatively arrange a proper one of a plurality of kinds of color temperature converting filters onto an optical axis of an image pickup device is provided and the driver of the filter member is controlled by using a plurality of color signals which are generated from the image pickup device, so that a proper color temperature converting filter can always be used. An adjusting mechanism for adjusting relative gains of a plurality of color signals which are generated from the image pickup device is further provided. By also adjusting the adjusting mechanism by using a plurality of color signals which are generated from the image pickup device, an automatic white balance control in a wide color temperature range can be accomplished.
Inventors
- 👤 Yuichiro Hattori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:03
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/84; H04N23/88; H04N23/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A color image pickup device comprising: (a) image pickup means; (b) a filter member having a plurality of kinds of color temperature converting filters which can be alternatively arranged on an optical axis of said image pickup means; (c) adjusting means for adjusting relative gains of a plurality of color signals which are generated from said image pickup means; (d) driving means for driving said filter member to switch a color temperature converting filter arranged on the optical axis; and (e) control means for controlling said adjusting means and said driving means on the basis of signals which are picked up by said image pickup means when a color temperature converting filter which corresponds to no filter is arranged on the optical axis.
Claim 2
Dependent Claim
123 words
A color image pickup device comprising: (a) image pickup means; (b) a filter member having a plurality of kinds of color temperature converting filters which can be alternatively arranged on an optical axis of said image pickup means; (c) adjusting means for adjusting relative gains of a plurality of color signals which are generated from said image pickup means; (d) driving means for driving said filter member to switch a color temperature converting filter arranged on the optical axis; and (e) control means for controlling said adjusting means and said driving means on the basis of signals which are picked up by said image pickup means when a color temperature converting filter which corresponds to no filter is arranged on the optical axis.
Claim 3
Dependent Claim
35 words
A device according to claim 1, wherein said control means forms color temperature information by using said signals and controls said adjusting means and said driving means on the basis of said color temperature information.
Claim 4
Dependent Claim
46 words
A device according to claim 2, wherein said control means includes a peak detection circuit to detect a peak level in one picture plane in said plurality of color signals and forms said color temperature information in accordance with an output of said peak detection circuit.
Claim 5
Dependent Claim
28 words
A device according to claim 1, wherein said control means controls said driving means by using said signals and, thereafter, controls said adjusting means by using said signals.
Claim 6
Dependent Claim
40 words
A device according to claim 1, wherein said control means includes a microprocessor and said microprocessor fetches data regarding levels of said signals and generates digital information to control said driving means and digital information to control said adjusting means.
Claim 7
Dependent Claim
32 words
A device according to claim 1, wherein said adjusting means includes a plurality of multipliers to respectively multiply a plurality of coefficients from said control means to said plurality of color signals.
Claim 8
Dependent Claim
36 words
A device according to claim 6, wherein said control means includes a microprocessor and said microprocessor fetches data regarding levels of said signals and generates a plurality of digital information corresponding to said plurality of coefficients.
Claim 9
Dependent Claim
34 words
A device according to claim 1, wherein said image pickup means includes a color separation optical system to separate an object image on said optical axis to object images of a plurality of colors.
Claim 10
Dependent Claim
98 words
A color image pickup device comprising: (a) image pickup means; (b) a filter member having a plurality of kinds of color temperature converting filters which can be alternatively arranged on an optical axis of said image pickup means; (c) driving means for driving said filter member to switch a color temperature converting filter arranged on the optical axis; and (d) control means for controlling said driving means on the basis of signals which are picked up by said image pickup means when a color temperature converting filter which corresponds to no filter is arranged on the optical axis.
Claim 11
Dependent Claim
98 words
A color image pickup device comprising: (a) image pickup means; (b) a filter member having a plurality of kinds of color temperature converting filters which can be alternatively arranged on an optical axis of said image pickup means; (c) driving means for driving said filter member to switch a color temperature converting filter arranged on the optical axis; and (d) control means for controlling said driving means on the basis of signals which are picked up by said image pickup means when a color temperature converting filter which corresponds to no filter is arranged on the optical axis.
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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) | 1998-03-13 | 1998-09-12 | 1999-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-13 | 2002-09-12 | 2003-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-13 | 2006-09-12 | 2007-03-14 | $7700.00 | Window Closed / Lapsed |