Variable density scanning apparatus

Details Variable density scanning apparatus Variable density scanning apparatus

1990-03-30

1991-10-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

346108, 358494, H01J 314

Patent

active

050536192

ABSTRACT:
A variable density scanning apparatus comprises a semiconductor laser which generates at least one laser beam, a first drive circuit which applies to said semiconductor laser a modulation drive signal having a predetermined modulation frequency in accordance with the density of dots constituting the pattern to be formed on the scanning surface, a dynamic diffraction grating which receives a laser beam from said semiconductor laser and diffracts said laser beam into a plurality of diffraction beams, a second drive circuit which applies to said dynamic diffraction grating a diffraction drive signal having a predetermined high frequency in accordance with the dot density, a polygonal mirror which receives a plurality of diffraction beams from said dynamic diffraction grating and scans said diffraction beam in the main scanning direction, a third drive circuit which applies to said polygonal mirror a rotation drive signal having a predetermined rotation frequency in accordance with the dot density, and a control unit which applies to said first, second and third drive circuits respectively a control signal that indicates an instruction to change the dot density.

REFERENCES:
patent: Re31334 (1983-08-01), Spaulding et al.
patent: 4000493 (1976-12-01), Spaulding et al.
patent: 4425023 (1984-01-01), Matsumoto et al.
patent: 4502081 (1985-02-01), Otsuka et al.
patent: 4600266 (1986-07-01), Omi
patent: 4650997 (1987-03-01), Yawn et al.
patent: 4651170 (1987-03-01), Chandler et al.
patent: 4768043 (1988-08-01), Saito et al.
patent: 4920364 (1990-04-01), Andrews et al.
patent: 4969699 (1990-11-01), Noguchi et al.

Affiliated with

Also associated with

Rating

Variable density scanning apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Variable density scanning apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable density scanning apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1756615