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US5349374A
Expired / Lapsed
US
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Color image forming device to prevent color shifting
Assignee: Fujifilm Business Innovation Corp
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Filing: 1992-12-24
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Granted: 1994-09-20
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Expires: 2012-12-24
Abstract
Abstract Disclosed is a color image forming device in which latent images are formed by radiating a light beam onto a photoreceptor for each of colors, the latent images are developed to provide visible images, and a recording medium is transported to the visible images a plurality of times to form on the recording medium a color image consisting of a plurality of colors. The color image forming device includes a unit for detecting a reference transporting position of the recording medium to be moved to the photoreceptor, a unit for detecting a scan start signal of the light beam, a unit for measuring an error time from detection of the reference transporting position to detection of the scan start signal, and a unit for correcting a radiation timing of the light beam in accordance with the error time.
Inventors
- 👤 Kazuhiko Arai
- 👤 Toru Teshigawara
- 👤 Toshiaki Sagara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:13
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/50; H04N1/506; H04N1/508; H04N1/04; H04N1/047; H04N1/0473; H04N1/113; H04N1/1135; H04N1/12; H04N2201/00; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04715; H04N2201/04722; H04N2201/04732; H04N2201/04744; H04N2201/04753; H04N2201/04758; H04N2201/04767; H04N2201/04781; H04N2201/04786
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A color image forming device in which latent images are formed by radiating a light beam onto a photoreceptor for each of a plurality of colors, the latent images are developed to provide visible images, and a recording medium is transported to the visible images a plurality of times to thereby form a color image consisting of a plurality of colors on the recording medium, said color image forming device comprising: means for detecting a reference transporting position of the recording medium to be moved to the photoreceptor; means for detecting a scan start signal of the light beam; means for measuring an error time from detection of the reference transporting position to detection of the scan start signal; and means for correcting a radiation timing of the light beam in accordance with the error time.
Claim 2
Dependent Claim
136 words
A color image forming device in which latent images are formed by radiating a light beam onto a photoreceptor for each of a plurality of colors, the latent images are developed to provide visible images, and a recording medium is transported to the visible images a plurality of times to thereby form a color image consisting of a plurality of colors on the recording medium, said color image forming device comprising: means for detecting a reference transporting position of the recording medium to be moved to the photoreceptor; means for detecting a scan start signal of the light beam; means for measuring an error time from detection of the reference transporting position to detection of the scan start signal; and means for correcting a radiation timing of the light beam in accordance with the error time.
Claim 3
Dependent Claim
32 words
The color image forming device as set forth in claim 1, wherein said correcting means delays and corrects a detection timing of said reference transporting position in accordance with said error time.
Claim 4
Dependent Claim
31 words
The color image forming device as set forth in claim 1, wherein said correcting means corrects a time from detection of said scan start signal to radiation of said light beam.
Claim 5
Dependent Claim
29 words
The color image forming device as set forth in claim 1, wherein said correcting means corrects said radiation timing for at least one of said colors for latent images.
Claim 6
Dependent Claim
20 words
The color image forming device as set forth in claim 1, wherein said recording medium includes an intermediate transfer member.
References Cited (Backward Citations)
US4903067A
Cited
US4893135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |