Focusing method, light beam optical system used therefor, and im

Details Focusing method, light beam optical system used therefor, and im Focusing method, light beam optical system used therefor, and im

1997-10-27

1999-10-26

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

2502012, 359319, B41J 247, G01D 1534, G02B 2600

Patent

active

059737204

ABSTRACT:
A light beam optical system is provided according to the present invention for focusing light beams from a light source on the surface of a photoconductive drum and the like via an optical system. This light beam optical system is capable of adjusting focal dislocation with high precision without being influenced by adhesion of toner for forming an image and the like to the photoconductive drum and the like or by change in the position of a light receiving section generated due to temperature change and the like. The light beam optical system comprises an optical system for focusing light beams from a light source on a photoconductive drum, a light receiving section for detecting on which of the front side or the rear side of the photoconductive drum light beams are focused, and control device for controlling the optical system based upon the detected result so that light beams are focused on the photoconductive drum.

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patent: 5856669 (1999-01-01), Nagasaka et al.
patent: 5883385 (1999-03-01), Takahashi et al.

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