Optical scanning apparatus with control circuit for optimizing t

Details Optical scanning apparatus with control circuit for optimizing t Optical scanning apparatus with control circuit for optimizing t

1990-03-08

1991-09-03

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Using optical device,

341155, 369 54, H03M 112

Patent

active

050461583

ABSTRACT:
Optical scanning apparatus which includes an A/D converter control circuit for matching the conversion range of an A/D converter to the range of an analog signal produced by a photo-sensitive detector in response to radiation originating from a radiation source such as a laser. The converter produces a binary overflow signal which signifies whether the analog signal is within or above the conversion range of the converter. Depending on the binary value of the overflow signal, a control signal generator produces either an increasing or decreasing control signal which is returned in a feedback loop to the radiation source to control the radiation intensity or to the converter to adjust its conversion range.

REFERENCES:
patent: 4091379 (1978-05-01), Wu et al.
patent: 4093961 (1987-06-01), Kanamaru
patent: 4851842 (1989-07-01), Iwanatsu

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