Digital copier having switchable pixel densities

Details Digital copier having switchable pixel densities Digital copier having switchable pixel densities

1989-03-16

1990-08-28

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

358472, H04N 100

Patent

active

049530364

ABSTRACT:
A digital copier capable of switching the pixel density of an image to be printed out. A laser printer installed in a writing section of the copier is also usable for printing out image data fed from another machine which may be operatively connected to the copier. A switching device is provided for switching the pixel density of an image to be printed out over to one of a plurality of pixel densities which matches with the particular machine connected to the copier. The switching device selects either one of at least two lenses included in illuminating optics of the laser printer and each having a different focal length, or selectively moves a single lens of the illuminating optics to any of a plurality of stop positions which are defined on an optical axis of the optics, or selectively changes the illumination time of a laser beam of the laser printer, or selectively changes the rotation speed of a mirror motor adapted to drive a polygonal mirror of the laser printer.

REFERENCES:
patent: 4268868 (1981-05-01), Yokota
patent: 4390903 (1983-06-01), Pomeroy
patent: 4423426 (1983-12-01), Kitamura
patent: 4580172 (1986-04-01), Rajagopal
patent: 4660094 (1987-04-01), Yoshimoto
patent: 4680642 (1987-07-01), Shimano et al.
patent: 4711553 (1987-12-01), Watanabe
patent: 4719515 (1988-01-01), Miyagawa
patent: 4771337 (1988-09-01), Endo

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