Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1989-04-26
1991-02-05
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250235, G01J 132
Patent
active
049907638
ABSTRACT:
A laser beam recorder arranged to record data with dots of a constant size, constant pitch and constant density, irrespective of possible differences in scanning speed between the middle and peripheral portions of a recording medium. The timing of irradiating the recording medium with the light beam is precipitated and the duration of the irradiation with the light beam is shortened as the scanning speed increases, whereby the dot size and dot pitch can be made constant irrespective of variation in the scanning speed. Further, the light beam is intensified as the scanning speed increases. Though the duration of the irradiation with the light beam is reduced with the increasing scanning speed, the amount of energy for recording one dot is maintained constant by intensifying the light beam as described, whereby the dot density can be maintained constant.
REFERENCES:
patent: 4178064 (1979-12-01), Mrdjen
patent: 4616132 (1986-10-01), Kessler
patent: 4757191 (1988-07-01), Shimada et al.
patent: 4837588 (1989-06-01), Imakawa et al.
patent: 4853535 (1989-08-01), Suganuma
Beck George
Fuji Photo Film Co. , Ltd.
Westin Edward P.
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