Apparatus for correcting scanning beams on basis of tilting of s

Details Apparatus for correcting scanning beams on basis of tilting of s Apparatus for correcting scanning beams on basis of tilting of s

1989-12-01

1991-09-10

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

250236, 358481, G02B 2610

Patent

active

050467964

ABSTRACT:
An apparatus for correcting a scranning beam produced by a polygonal mirror tilting in small surface segments in each mirror surface segment caused by uneven mirror surfaces of the polygonal mirror. Data indicative of the amount of tilting in each of the surface segments is stored in a memory, which is addressed by a data signal indicative of the present scanning position of the polygonal mirror. Output data from the memory is applied to an acousto-optical modulator disposed in the beam path between the light source and the polygonal mirror.

REFERENCES:
patent: 4002830 (1977-01-01), Brown et al.
patent: 4019186 (1977-04-01), Dressen et al.
patent: 4270131 (1981-05-01), Tompkins et al.
patent: 4404590 (1983-09-01), Juergensen et al.
patent: 4776654 (1988-10-01), Ishizuka et al.

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