Patent US1775615A successfully refreshed from Google Patents.
EP0572325A1
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EP
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Electrophotographic image forming apparatus with density regulating mechanism
Assignee: Canon Inc
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Filing: 1993-05-28
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Granted: —
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Expires: 2013-05-28
Abstract
Abstract A density regulating mechanism for varying the reproduction of a specified color in an electrophotographic image forming apparatus comprises reader means (11) for reading the image information of an original (D) with color separation, to generate electrical signals; synthesizing means for synthesizing thus read color-separates signals to generate a monochromatic image; and density regulating means for regulating the output image generated by said synthesizing means. The density regulating means outputs density information by varying the blending ratio of the color-separated signals, obtained by image reading with the reader means, according to the selected density level.
Inventors
- 👤 Nobumasa C/O Canon Kabushiki Kaisha Fukuzawa
- 👤 Tsuyoshi C/O Canon Kabushiki Kaisha Kunishi
- 👤 Hiroyuki C/O Canon Kabushiki Kaisha Ichikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 10:27
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40012
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
An image forming apparatus provided with a density regulating mechanism, comprising: reader means for reading the image information of an original with color separation to generate electrical signals; synthesizing means for synthesizing the read color-separated signals to generate a single color image; density regulating means for regulating the density of the output image generated by said synthesizing means; and image forming means capable of varying the image forming conditions of an image forming apparatus, according to the density information released from said density regulating means; wherein said density regulating means is adapted to release density information by varying the blending ratio of the color-separated signals read by said reader means, according to the selected density level.
Claim 2
Dependent Claim
23 words
An apparatus according to claim 1, wherein the electrical signals obtained by image reading with said reader means are outputted as digital signals.
Claim 3
Dependent Claim
28 words
An apparatus according to claim 1, wherein said variation of the blending ratio of the color-separated signals is conducted only in a specified region of the density level.
Claim 4
Dependent Claim
154 words
An image forming apparatus provided with a density regulating mechanism, comprising: reader means for reading the image information of an original with color separation by a solid-state image pickup device to generate digital electrical signals; synthesizing means for synthesizing the read color-separated signals to generate a single color image; density regulating means for regulating the density of the output image generated by said synthesizing means; and image forming means capable of varying the image forming conditions of the apparatus, according to the density information outputted from said density regulating means; wherein said density regulating means is adapted to release density information either by varying the blending ratio of the color-separated signals read by said reader means, or without such variation of the blending ratio, according to the selected density level, and, in the latter case, the density information being obtained by dividing the sum of the color-separated signals with the number of separated colors.
Claim 5
Dependent Claim
28 words
An apparatus according to claim 4, wherein said variation of the blending ratio of the color-separated signals is conducted only in a specified region of the density level.
Claim 6
Dependent Claim
24 words
An apparatus according to claim 4, wherein said solid-state image pickup device separates the original color into three colors of red, green and blue.
Claim 7
Dependent Claim
20 words
An apparatus according to claim 6, wherein the color of the monochromatic image outputted by said synthesizing means is black.
Claim 8
Dependent Claim
26 words
An apparatus according to claim 4, wherein the variation in the blending ratio of the color-separated signals is changed to emphasize the reproduction of reddish colors.
Claim 9
Dependent Claim
26 words
An apparatus according to claim 4, wherein the variation in the blending ratio of the color-separated signals is changed to emphasize the reproduction of bluish colors.
Claim 10
Dependent Claim
27 words
An apparatus according to claim 4, wherein the variation in the blending ratio of the color-separated signals is changed to weaken the reproduction of a specific color.
References Cited (Backward Citations)
US4977448A
Cited
US5155587A
Cited
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