Scanning beam reference employing a retroreflective code means

Details Scanning beam reference employing a retroreflective code means Scanning beam reference employing a retroreflective code means

1981-09-03

1984-05-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 358293, H01J 314

Patent

active

044477236

ABSTRACT:
The laser beam of a flying spot scanner is turned on and off to write data under control of a reference clock that generates clock signals determined by the position of the writing beam. To detect position of the writing beam a reference beam is scanned in synchronism with the writing beam along and through a coding mask to a strip of retroreflective material fixed adjacent the mask. The reference beam is retroreflected through the mask back through the scanning optics to a fixed detector that produces an output determined by the scanning coded reference beam. Unwanted reflections from the mask surface are separated by tilting the mask.

REFERENCES:
patent: 3744915 (1973-07-01), Sick
patent: 4025796 (1977-05-01), Erdmann
patent: 4208589 (1980-06-01), Dashwood et al.
patent: 4352984 (1982-10-01), Ohara

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