Patent US4943834A successfully refreshed from Google Patents.
US4943834A
Expired / Lapsed
US
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Image forming apparatus capable of detecting, analyzing and displaying an originals spectroscopic color data
Assignee: Sharp Corp
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Filing: 1988-09-01
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Granted: 1990-07-24
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Expires: 2008-09-01
Abstract
Abstract A color copier includes an optical sensor unit and analyzes colors of reflected light from an original to be copied by detecting spectroscopic color data of the reflected light. Amounts of toner of different colors for forming a color image are determined according to such detected spectroscopic color data.
Inventors
- 👤 Yasutaka Maeda
- 👤 Tsuyochi Miyamoto
- 👤 Yukihiko Ueno
- 👤 Hiromi Washio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5025; G03G15/01
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
In a color copier which includes a photoreceptor, separates colors of reflected light from an original and forms a color toner image by toner of complementary colors, the improvement wherein said color copier comprises optical sensor means for analyzing colors of said reflected light from said original and detecting spectroscopic color data of said reflected light, a control panel, and control means for causing said detected spectroscopic color data to be display on said control panel and operating said color copier under conditions inputted through said control panel.
Claim 2
Dependent Claim
88 words
In a color copier which includes a photoreceptor, separates colors of reflected light from an original and forms a color toner image by toner of complementary colors, the improvement wherein said color copier comprises optical sensor means for analyzing colors of said reflected light from said original and detecting spectroscopic color data of said reflected light, a control panel, and control means for causing said detected spectroscopic color data to be display on said control panel and operating said color copier under conditions inputted through said control panel.
Claim 3
Dependent Claim
46 words
The color copier of claim 1 wherein said control means also serves to control amounts of toner of different colors to be attached to form a copy of said original according to claim spectroscopic color data detected by said optical sensor means and said inputted conditions.
Claim 4
Dependent Claim
26 words
The color copier of claim 2 further comprising a photoreceptor control, said photoreceptor control including means for setting exposure of said photoreceptor to said reflected light.
Claim 5
Dependent Claim
20 words
The color copier of claim 3 wherein said control means further includes means for setting surface voltage of said photoreceptor.
Claim 6
Dependent Claim
31 words
The color copier of claim 4 further comprising developing means for developing a toner image on said photoreceptor, said control means including means for setting bias voltage of said developing means.
Claim 7
Dependent Claim
26 words
The color copier of claim 1 wherein said optical sensor means includes three spectroscopic sensors each having a color filter and having associated therewith an amplifier.
Claim 8
Dependent Claim
26 words
The color copier of claim 6 further comprising photo amplifiers being adjusted according to transmissivity characteristics of said filter and color sensitivity characteristics of said photoreceptor.
References Cited (Backward Citations)
US4564287A
Cited
US4653014A
Cited
JPS61140961A
Cited
US4742372A
Cited
US4834541A
Cited
US4830501A
Cited
JPS63249166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |