Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1994-10-12
1997-03-25
Fuller, Benjamin R.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347237, B41J 247, B41J 2435
Patent
active
056149360
ABSTRACT:
The present invention provides an image forming apparatus comprising a conversion circuit for receiving an image signal indicating the density of a pixel in an image formed from a plurality of the pixels arranged in a matrix of a main scanning direction and a sub scanning direction crossing at right angles and for converting the image signal into a signal indicating a coloring pattern corresponding to the density; and a printing device for receiving the signal indicating the coloring pattern and for printing the image on a medium by coloring each of the plurality of the pixels in accordance with the coloring pattern. In this image forming apparatus, each of the plurality of the pixels is divided into N sub-pixels in the sub scanning direction, wherein N is an integer larger than 1, and the conversion circuit generates, as the signal indicating the coloring pattern of each pixel, a signal indicating one of L patterns selected in accordance with the image signal, wherein L is an integer larger than N+1. Each of the L patterns indicates which sub-pixels among the N sub-pixels are to be colored, thereby attaining L different densities of the pixel.
REFERENCES:
patent: 4700206 (1987-10-01), Yamakawa
patent: 5006870 (1991-04-01), Hirahara et al.
patent: 5245355 (1993-09-01), Morton
patent: 5255013 (1993-10-01), Ng et al.
Fuller Benjamin R.
Matsushita Electric - Industrial Co., Ltd.
Nguyen Thinh
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