Method and apparatus for generating a scan timing signal with di

Details Method and apparatus for generating a scan timing signal with di Method and apparatus for generating a scan timing signal with di

1988-10-20

1989-09-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250236, H01J 314

Patent

active

048664642

ABSTRACT:
A novel apparatus for use in generating a scan timing signal in a laser raster scanner includes an optical diffuser positioned to receive a scanned reference beam through a reference mask. The diffused, modulated reference beam is presented to an array of photodetectors. The number of photodetectors in the array is selected to be sufficient so that at least two photodetectors receive the diffused modulated reference beam simultaneously as the reference beam is scanned along the reference mask.

REFERENCES:
patent: 4602154 (1986-07-01), Taniguchi
patent: 4613753 (1986-09-01), Okada et al.
patent: 4667099 (1987-05-01), Arai et al.

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