Patent EP0604941A2 successfully refreshed from Google Patents.
EP0604941A2
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Image forming apparatus
Assignee: Canon Inc
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Filing: 1993-12-27
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Granted: —
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Expires: 2013-12-27
Abstract
Abstract An image forming apparatus (100) for determining and correcting image forming condition. Test image signals of a plurality of different density levels are generated, and a test image based on the test image signals is formed on an photosensitive drum (106). The density of the test image is measured and image forming condition is determined. The test image is printed on a recording sheet, and the density of the printed image is measured. The measured density of the printed image is compared with the density level of the test image signal. Correction to the image forming condition is performed in accordance with the comparison result.
Inventors
- 👤 Nobuatsu C/O Canon K.K. Sasanuma
- 👤 Hisashi C/O Canon K.K. Fukushima
- 👤 Tesuya C/O Canon K.K. Atsumi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:24
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5062; G03G15/5033; G03G15/5041; H; H04; H04N; H04N1/00; H04N1/40; H04N1/407; H04N1/4076; H04N1/4078; G03G2215/00; G03G2215/00025; G03G2215/00029; G03G2215/00033; G03G2215/00037; G03G2215/00042
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
210 words
An image forming apparatus comprising: input means for inputting an image signal; generation means for generating an image signal of an arbitrary density level; image forming means for forming a visible image on a recording medium based on the image signal generated by said generation means; first measurement means for measuring a density of the image formed on the recording medium by said image forming means; control means for controlling said generation means to generate test image signals of a plurality of different density levels, controlling said image forming means to form a test image based on the test image signals of different density levels on the recording medium, controlling said first measurement means to measure a density of the test image, and determining an image forming condition of the image signal inputted by said input means; and transfer means for transferring the test image formed on the recording medium onto a recording sheet; characterized by comprising: second measurement means for measuring the density of the test image transferred on the recording sheet; and correction means for comparing the density of the test image measured by said second measurement means with the density level of the test image signal generated by said generation means, and correcting the image forming condition.
Claim 2
Dependent Claim
42 words
The apparatus according to Claim 1, characterized in that said correction means corrects the image forming condition so that the density of the test image measured by said second measurement means will correspond to the density level of the test image signal.
Claim 3
Dependent Claim
25 words
The apparatus according to Claim 1, characterized in that by further comprising a memory for storing the image forming condition corrected by said correction means.
Claim 4
Dependent Claim
48 words
The apparatus according to Claim 1, characterized in that said input means is reading means for reading an original image, and said second measurement means measures the density of the test image by reading the recording sheet on which the test image is transferred, by said reading means.
Claim 5
Dependent Claim
50 words
The apparatus according to Claim 1, characterized in that said control means has a first table in which data indicating relation between the density level of the test image signal and output of said first measurement means is stored, and said correction means corrects the data of the first table.
Claim 6
Dependent Claim
67 words
The apparatus according to Claim 5, characterized in that said control means has a second table in which data for converting a density level of an input image signal so that the density of an image formed on the recording medium linearly changes with respect to the change in a density level of an image signal, and said correction means corrects the data of the second table.
Claim 7
Dependent Claim
59 words
The apparatus according to Claim 1, characterized in that said generating means is able to generate a test image having a plurality of colors, said control means determines the image forming condition of each of the plurality of colors of the test image, and said correction means corrects the image forming condition of each of the plurality of colors.
Claim 8
Dependent Claim
56 words
The apparatus according to Claim 1, characterized in that said generating means is able to generate a test image having a plurality of colors, said control means determines the image forming condition in each of the plurality of colors of the test image, and said correction means corrects the image forming condition of a designated color.
References Cited (Backward Citations)
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