Optical scanning method

Details Optical scanning method Optical scanning method

1987-09-18

1989-03-14

Sikes, William L.

Coherent light generators

Particular component circuitry

Optical pumping

372 33, 372 24, H01S 300

Patent

active

048130460

ABSTRACT:
A modulated laser beam emitted from a semiconductor laser is deflected by a rotating light beam deflector to scan a surface, without using an f.theta. lens. The light intensity of the laser beam is set to a first reference level by a reference signal, and to a second reference level by a corrected-width control signal. Each time the frequency-dividing ratio for a reference clock signal from an oscillator is changed, a digital correction signal is produced. The gain of a D/A converter for converting the correction signal is adjusted by the corrected-width control signal which has been converted to an analog signal. The reference signal which has been converted to an analog signal is modulated by the converted correction signal to generate an analog signal which varies in a step-like manner in proportion to a change in the scanning rate. The last-mentioned analog signal is modulated by a modulating signal, and the modulated analog signal is applied to drive the semiconductor laser to optically write desired information.

REFERENCES:
patent: 3636250 (1972-01-01), Haeft
patent: 4763334 (1988-08-01), Shimada et al.

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