Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Patent
1998-12-21
2000-10-17
Lee, Susan S. Y.
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
358298, 358454, 399302, 399307, 399308, B41J 2385, G03G 1304, G03G 1516, G03G 1520, H04N 152
Patent
active
06133927&
ABSTRACT:
In an image forming apparatus which represents gradation of an image by using a halftone screen structure, and which transfers and fixes the image onto a print sheet by using an intermediate transfer body, where a number of protruding portions are provided with an approximately uniform distribution, the degradation of image quality due to a moire fringe pattern produced by the halftone screen structure and the distribution of the protruding portions of the intermediate transfer body is reduced. At least one of the distribution of the protruding portions and the structure of the halftone representation screen is controlled such that the pitch of a moire fringe pattern produced by the protruding portions 51 and a toner image in the highest lightness color is not longer than the pitches of moire fringe patterns produced by the protruding portions and toner images in other colors, or the pitch of a moire fringe pattern produced by the protruding portions and a toner image in the lowest lightness color is not shorter than the pitches of moire fringe patterns produced by the protruding portions and toner images in other colors, or the pitch of moire fringe patterns is 0.5 mm or shorter.
REFERENCES:
patent: 2990278 (1961-06-01), Carlson
patent: 4903123 (1990-02-01), Kawamura et al.
patent: 5715073 (1998-02-01), Miller
patent: 5854882 (1998-12-01), Wang
patent: 6016417 (2000-01-01), Katsuno et al.
Arai Kazuhiko
Ishikawa Kiyotaka
Fuji 'Xerox Co., Ltd.
Lee Susan S. Y.
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