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Patent Searching and Data

Document Type and Number:
Japanese Patent JPH0655772
Kind Code:

PURPOSE: To obtain a color image forming device which can conduct high-quality image recording with an improved resolving power.

CONSTITUTION: Image density data from an image density data storage circuit 210 is read by a reading circuit 220. In a pixel data conversion circuit 240, the data is subjected to a RE processing, wherein a target pixel is divided into small pixels and the density of the target pixel is distributed per small pixel in accordance with the distribution of adjacent pixel density data including the target pixel, and density data of a pixel center and a part adjacent to a pixel (a pixel-to-pixel part) are found. As a reference wave, a triangular wave B is generated by delaying a reference clock DCK0 by 1/2 period from a B clock obtained by a doubling inversion circuit 281 at twice the frequency of an original pixel clock. Density data per color is modulated on a reference wave signal by modulation circuits 260A, 260B. Pulse width modulation signals positioned on a pixel center and a pixel-to-pixel part are generated. In first and second scanning by two laser beams based on the moldulation signals, an image is recorded in main scanning and sub-scanning directions by an image exposure of a pixel center and a pixel-to-pixel part.

Haneda, Satoru
Kumada, Tatsuo
Yamamoto, Hiroyuki
Application Number:
Publication Date:
March 01, 1994
Filing Date:
August 06, 1992
Export Citation:
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International Classes:
B41J2/44; H04N1/23; (IPC1-7): B41J2/44; H04N1/23