Exposure unit for a multicolor image forming apparatus capable o

Details Exposure unit for a multicolor image forming apparatus capable o Exposure unit for a multicolor image forming apparatus capable o

1992-09-09

1994-03-01

Pendegrass, Joan H.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

346157, 358296, G03G 1504, G03G 1501

Patent

active

052912230

ABSTRACT:
An exposure device includes a polygon mirror to scan a photoreceptors with a plurality of laser beams to write plural color component latent images. The polygon mirror receives two laser beams at its two mirrors which are arranged diagonal to each other and reflects the two laser beams in the opposite directions to each other so that a first laser beam scans from the first side to the second side of the photoreceptor. On the photoreceptor are provided sensors to output first and second position signals independently when the first and second laser beams pass respectively the reference position mark disposed at one side on the photoreceptor. The exposure device is controlled in accordance with the position signals so that the start timing of the first laser beam is determined on the basis of the first position signal which is obtained in the current scanning line of the first laser beam and that the start timing of the second laser beam is determined on the basis of the second position signal which has been obtained in the previous scanning line of the second laser beam.

REFERENCES:
patent: 4531828 (1985-07-01), Hoshino
patent: 4591903 (1986-05-01), Kawamura et al.
patent: 5175570 (1992-12-01), Haneda et al.

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