Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1982-09-28
1985-01-15
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250236, 350 65, G01J 120
Patent
active
044939906
ABSTRACT:
An apparatus for automatically adjusting the characteristic of a deflection unit, illustratively of the type used in laser recording equipment. A reference value for the deflection unit is conducted to a first input of a multiplier, the second input of which is connected to the output of a first memory. The output of the multiplier is connected to a first input of an adder, the second input of which is connected to the output of a second memory. In addition, a comparator is provided which compares the position of the deflection unit with two adjustment reference values. The content of the second memory is varied in response to a zero-adjustment command until, for a predetermined reference value zero, the deflection unit has assumed a zero position. Upon the issuance of a slope-adjustment command, the content of the first memory is varied until, for a second adjustment reference value, the deflection unit has assumed its desired position. The contents of the memories are preserved so that a reference value which is predetermined in normal operation is corrected so that the characteristic of the deflection unit agrees with a desired characteristic.
REFERENCES:
patent: 4264809 (1981-04-01), Fearnside
patent: 4417330 (1983-11-01), Hazel et al.
Patent Abstracts of Japan, Jun. 9, 1981, vol. 5, No. 88, 56-35222.
Koszytorz Gunther
Lucke Herbert
Schlosser Gerhard
Vath Joachim
Gatto J.
Nelms David C.
Siemens Aktiengesellschaft
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