Optical system including provisions for correcting scanning beam

Details Optical system including provisions for correcting scanning beam Optical system including provisions for correcting scanning beam

1994-02-04

1995-08-15

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359216, H01J 314

Patent

active

054421713

ABSTRACT:
A beam spot detector is disposed on an extension of a surface to be scanned by a beam of light. The beam spot detector has a mask in front thereof, the mask having a side which the beam of light intersects perpendicularly and a side which the beam of light intersects obliquely. An output signal of the detector is differentiated at a differentiating circuit, and positive and negative peak values are held at a peak hold circuit. A CPU calculates diameters of the beam of light in both a main scanning direction and an auxiliary scanning direction from the peak values. If the beam of light is out of focus, then the CPU outputs adjustment signals. A counter calculates a width of the output signal of the beam spot detector and outputs the calculated width to a CPU. The CPU compares the received width with a reference to detect a displacement in the auxiliary scanning direction (displacement of registration) and outputs a correction signal.

REFERENCES:
patent: 4206348 (1980-06-01), Davy et al.
patent: 4587420 (1986-05-01), Noguchi et al.
patent: 5105296 (1992-04-01), Cho et al.
Casler et al., "Deflection Sensor For Optical Scanners," IBM Technical Disclosure Bulletin, vol. 15, No. 1, Jun. 1972.
Patent Abstracts of Japan, Publication No. JP 60100113, Apr. 1985.

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