Light beam scanning apparatus having two detectors whose signal

Details Light beam scanning apparatus having two detectors whose signal Light beam scanning apparatus having two detectors whose signal

1988-09-22

1989-11-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350 66, H01J 314, H01J 516, H01J 4014

Patent

active

048824909

ABSTRACT:
A light beam scanning apparatus scans an object such as a stimulable phosphor sheet by applying a light beam deflected in a main scanning direction to the object while moving the object in an auxiliary scanning direction substantially normal to the main scanning direction. The light beam scanning apparatus includes first and second light detectors such as photodiodes juxtaposed in the main scanning direction and having respective light detecting surfaces extending in the auxiliary scanning direction. The first and second light detectors produce respective output signals at a predetermined ratio when the light beam for scanning the object in the main scanning direction is in a reference main scanning position, and produce respective output signals at a ratio varied from the predetermined ratio when the light beam is deviated from the reference main scanning positon. The main scanning position of the light beam with respect to the object can be detected from the ratio of the output signals of the first and second light detectors.

REFERENCES:
patent: 3864036 (1975-02-01), Vanheerentals
patent: 4039246 (1977-08-01), Voigt
patent: 4329011 (1982-05-01), Mori et al.

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