Apparatus for printing color image by combination of optical bea

Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic

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347248, B41J 2385, B41J 247, G03G 1501

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active

059824026

ABSTRACT:
A tandem type color printer, having optical beam scanning units and corresponding photosensitive drums, which detects a positional shift of a scanning locus occurring on a corresponding one of the plurality of photosensitive drums, and automatically corrects the detected positional shift of the scanning locus. A detecting window, in which a beam transmission time varies with a change in the beam scanning position, is provided at each of the start end side and the terminal end side of each of a plurality of beam scanning loci in a mask plate. The mask plate is arranged between the optical beam scanning units and the photosensitive drums, to provide output of a detection signal corresponding to the incident time of the transmission beam resulting from beam scanning by a light source, and thus determines and corrects the direction and the amount of positional shift of the scanning locus.

REFERENCES:
patent: 3809806 (1974-05-01), Walker et al.
patent: 4779944 (1988-10-01), Ritter et al.
patent: 5264872 (1993-11-01), Wong

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