Scanning optical apparatus having focus position detector

Details Scanning optical apparatus having focus position detector Scanning optical apparatus having focus position detector

1990-05-11

1991-02-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

346108, 350 68, 2502012, G02B 2608, H01J 314

Patent

active

049907719

ABSTRACT:
A scanning optical apparatus comprises a light source unit, an optical system for converging a light beam from the light source unit at a predetermined position, a moving device for moving the converged position of the light beam by the optical system, a deflecting device for deflecting the light beam from the light source unit in a predetermined direction, a light receiving device for receiving the light beam deflected by the deflecting device, a processing device for processing a signal obtained by said light receiving device, and a control device for controlling the moving device corresponding to a signal from the processing device. The light beam emitted from the light source unit is scanned on the light receiving device a plurality of times through the optical system and the deflecting device, while the converged position of the light beam is moved by the moving device. The signal from the light receiving device during each of the plurality of scans is compared or calculated by the processing device to thereby adjust and determine the converged position of the light beam by the optical system.

REFERENCES:
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patent: 4274101 (1981-06-01), Kataoka et al.
patent: 4314154 (1982-02-01), Minoura et al.
patent: 4323297 (1982-04-01), Kawamura et al.
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patent: 4661861 (1987-04-01), Rutherford et al.
patent: 4720632 (1988-01-01), Kancko
patent: 4733064 (1988-03-01), Ishikawa
patent: 4829175 (1989-05-01), Goto et al.

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