Light beam scanning apparatus with controller for varying spacin

Details Light beam scanning apparatus with controller for varying spacin Light beam scanning apparatus with controller for varying spacin

1989-08-07

1991-04-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

346108, H01J 314

Patent

active

050067052

ABSTRACT:
A scanning apparatus for use in a laser beam printer or the like comprising a control means for varying the spacing between adjoining scanning beams of a plurality of laser beams, which further comprises a plurality of light sources, a means for changing intensity, including on/off states, of the beam from the light sources, and a rotating polygonal mirror for allowing the beams to scan the scanned plane in parallel, and is adapted, in accordance with the value of the pixel density of information to be recorded, such that, in the beam scanning direction, the area exposed to the beam is changed by changing the width of a beam intensity modulating pulse, and in the direction perpendicular to the beam scanning, the number of revolutions of the rotating polygonal mirror is changed.

REFERENCES:
patent: 4644160 (1987-02-01), Arimoto et al.
patent: 4725855 (1988-02-01), Arimoto et al.
patent: 4760407 (1988-07-01), Arimoto et al.
patent: 4841137 (1989-06-01), Mochizuki

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