Light beam deviation detecting device used in an image forming a

Details Light beam deviation detecting device used in an image forming a Light beam deviation detecting device used in an image forming a

1995-02-10

1996-07-23

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

2502081, 2502083, 2505781, 359204, 359216, G11B 700, G02B 2608

Patent

active

055397190

ABSTRACT:
A light beam deviation detecting device for detecting deviation of parallel light beams which simultaneously scan a photoreceptor in a primary scanning direction of the parallel light beams. The device includes: at least two sensors, each having a plane surface, for detecting the parallel light beams; in which initial contact edges of the plane detective surfaces on the sensors are not parallel to each other when the parallel light beams scan the plane surfaces in their primary scanning direction; a calculator circuit for counting time periods of the parallel light beams scanning from the initial contact edge of one of the plane surfaces to the initial contact edge of the other, and for calculating difference among the time periods; and a deviation calculator circuit for calculating deviation of the difference among the time periods from a reference time difference so that deviation of scanning positions of the parallel light beams in relation to each other in a sub-scanning direction, which is perpendicular to the primary scanning direction, is determined; in which an angle .theta. between the initial contact edge of one of the plane surfaces and the initial contact edge of the other satisfies: 53.13.degree..ltoreq..theta..ltoreq.126.86.degree..

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*English language Abstract only.
PATENT ABSTRACTS OF JAPAN, vol. 14, No. 298 (P-1068) Jun. 27, 1990 & JP-A-02 093 619 (MITA), Apr. 4, 1990.
PATENT ABSTRACTS OF JAPAN, vol. 14, No. 472 (P-1116) Oct. 15, 1990 & JP-A-02 188 713 (CANON), Jul. 24, 1990.

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