Patent US4135339A successfully refreshed from Google Patents.
Patent US5457487A successfully refreshed from Google Patents.
US5457487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color image forming apparatus which times release of each of plural color image signals
Assignee: Canon Inc
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Filing: 1992-12-30
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Granted: 1995-10-10
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Expires: 2012-12-30
Abstract
Abstract A color image forming apparatus forms a color image by superposing images of plural colors in plane-sequential manner. In the color image forming apparatus, the amount of aberration between the detection signal for the recording medium for the first color and the horizontal synchronization signal is measured by a counter, and the start timing of image formation of the second and subsequent colors is controlled by a delay device, according to the measured amount of aberration.
Inventors
- 👤 Eihiro Sakaki
- 👤 Hidekazu Tominaga
- 👤 Yasuo Ito
- 👤 Akira Torisawa
- 👤 Masaki Ohtake
- 👤 Tetsuya Kobayashi
- 👤 Fumihiro Ueno
- 👤 Tomohiro Hashimoto
- 👤 Eiichiro Teshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:27
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/047; G; G03; G03G; G03G15/00; G03G15/01; G03G15/0105; G03G15/0131; H04N1/46; H04N1/50; H04N1/506; H04N1/508; H04N1/113; H04N1/1135; H04N1/12; H04N2201/00; H04N2201/024; H04N2201/02406; H04N2201/02425; H04N2201/028; H04N2201/03; H04N2201/031; H04N2201/03104; H04N2201/0315; H04N2201/03158; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04729; H04N2201/04731; H04N2201/04732; H04N2201/04744; H04N2201/04753; H04N2201/04758; H04N2201/04767; H04N2201/04789; H04N2201/04791
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
181 words
A color image forming apparatus comprising: light scanning means for scanning an image carrying member with a light beam modulated according to an image signal; light detection means for detecting, in a predetermined position, the light beam scanned by said light scanning means; plural developing means for developing latent images, formed on said image carrying member by the scanning with said light scanning means, with recording materials for respective color components; transfer means for transferring the developed images, obtained with said developing means, in succession onto a single transfer material; position detection means for detecting said transfer material at a predetermined position, prior to transfer by said transfer means; measuring means for measuring an aberration between a position detection signal for the transfer material by said position detection means for a particular color and a beam detection signal by said light detection means; and control means for controlling release of an image signal for a color other than the predetermined color, from detection of the transfer material by said position detecting means according to the aberration measured by said measuring means.
Claim 2
Dependent Claim
181 words
A color image forming apparatus comprising: light scanning means for scanning an image carrying member with a light beam modulated according to an image signal; light detection means for detecting, in a predetermined position, the light beam scanned by said light scanning means; plural developing means for developing latent images, formed on said image carrying member by the scanning with said light scanning means, with recording materials for respective color components; transfer means for transferring the developed images, obtained with said developing means, in succession onto a single transfer material; position detection means for detecting said transfer material at a predetermined position, prior to transfer by said transfer means; measuring means for measuring an aberration between a position detection signal for the transfer material by said position detection means for a particular color and a beam detection signal by said light detection means; and control means for controlling release of an image signal for a color other than the predetermined color, from detection of the transfer material by said position detecting means according to the aberration measured by said measuring means.
Claim 3
Dependent Claim
16 words
An apparatus according to claim 1, wherein said apparatus forms an image by an electrophotographic process.
Claim 4
Dependent Claim
67 words
An apparatus according to claim 1, wherein said control means generates, for a predetermined color, a vertical synchronization signal with a constant timing with respect to the position detection signal from said position detection means, and, for other colors, the vertical synchronization signal with a timing corresponding to the measured value of said measuring means, with respect to the position detection signal from said position detection means.
Claim 5
Dependent Claim
13 words
An apparatus according to claim 1, wherein said measuring means includes a timer.
Claim 6
Dependent Claim
42 words
An apparatus according to claim 1, wherein said measuring means includes means for dividing predetermined time into plural divided times; and means for discriminating one of plural divided times, divided by said dividing means, in which a vertical synchronization signal is released.
Claim 7
Dependent Claim
49 words
An apparatus according to claim 3, wherein said control means includes delay means for delaying the position detection signal from said position detection means with a delay amount corresponding to the measured value by said measuring means, said delay means releasing said delayed signal as the vertical synchronization signal.
Claim 8
Dependent Claim
56 words
An apparatus according to claim 3, wherein said control means includes means for generating plural vertical synchronization signals of mutually different timings with respect to the position detection signal from said position detection means, and selection means for selectively releasing one of said plural vertical synchronization signals, according to the measured value by said measuring means.
Claim 9
Dependent Claim
94 words
An image processing apparatus for controlling release of each of plural image signals of respective plural colors which are superposed in plane-sequential manner on a recording medium so as to form a full color image, comprising: measuring means for measuring, at release of an image signal of a first color, an output timing of a horizontal synchronization signal with respect to a position signal of said recording medium; and control means for controlling timing of release of image signals of second and subsequent colors, according to the measured output timing of said measuring means.
Claim 10
Dependent Claim
94 words
An image processing apparatus for controlling release of each of plural image signals of respective plural colors which are superposed in plane-sequential manner on a recording medium so as to form a full color image, comprising: measuring means for measuring, at release of an image signal of a first color, an output timing of a horizontal synchronization signal with respect to a position signal of said recording medium; and control means for controlling timing of release of image signals of second and subsequent colors, according to the measured output timing of said measuring means.
Claim 11
Dependent Claim
64 words
An apparatus according to claim 8, wherein said control means generates a vertical synchronization signal with different timings according to the measured value of said measuring means, in relation to the release of the image signals of the second and subsequent colors, thereby controlling the timing of release of the image signals of the second and subsequent colors with respect to said position signal.
Claim 12
Dependent Claim
13 words
An apparatus according to claim 8, wherein said measuring means includes a timer.
Claim 13
Dependent Claim
42 words
An apparatus according to claim 8, wherein said measuring means includes means for dividing predetermined time into plural divided times; and means for discriminating one of plural divided times, divided by said dividing means, in which a vertical synchronization signal is released.
Claim 14
Dependent Claim
37 words
An apparatus according to claim 9, wherein said control means delays said position signal with a delay amount according to the measured value of said measuring means and releases the delayed signal as the vertical synchronization signal.
Claim 15
Dependent Claim
50 words
An apparatus according to claim 9, wherein said control means includes means for generating plural vertical synchronization signals with mutually different timings with respect to said position signal; and selection means for selectively releasing one of said plural vertical synchronization signals, according to the measured value of said measuring means.
Claim 16
Dependent Claim
31 words
An apparatus according to claim 8, further comprising image forming means for forming a color image by superposing images in plane-sequential manner, in accordance with image signals of respective color components.
Claim 17
Dependent Claim
16 words
An apparatus according to claim 14, wherein said image forming means releases the horizontal synchronization signal.
Claim 18
Dependent Claim
20 words
An apparatus according to claim 14, wherein said image forming means forms a color image by an electrostatic recording method.
Claim 19
Dependent Claim
23 words
An apparatus according to claim 14, wherein said image forming means forms a color image by an electrophotographic process utilizing a laser beam.
Claim 20
Dependent Claim
44 words
An apparatus according to claim 17, wherein said image forming means includes deflection means for scanning a photosensitive member with a laser beam, and means for detecting said laser beam at a predetermined position and releasing the detection signal as the horizontal synchronization signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-10-09 | 1999-04-10 | 1999-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-09 | 2003-04-10 | 2003-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-09 | 2007-04-10 | 2007-10-10 | $7700.00 | Window Closed / Lapsed |