Light beam focal position detecting device, light beam projectin

Details Light beam focal position detecting device, light beam projectin Light beam focal position detecting device, light beam projectin

1996-10-02

1998-11-24

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

B41J 247

Patent

active

058414657

ABSTRACT:
A light beam focal position detecting device for detecting the focal position of a scanning light beam to correct the focal error on the photosensitive drum surface includes a photosensor which is placed at a position on the light beam axis before or after the expected focal position and made up of a pair of rectangular opto-electric transducers having their confronting sides extending along the main scanning direction or a plurality of opto-electric transducers arrayed along the subordinate scanning direction.

REFERENCES:
patent: 4198154 (1980-04-01), Masegi et al.
patent: 4530080 (1985-07-01), Aoi et al.

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