Patent ID: 6151056
Filing Date: 2000-11-21
Classification: B41J,G02B,G06K,H04N

Abstract:
A laser scan based recording apparatus in which laser light emitted from a laser light source is reflected by a polygonal mirror, having a plurality of reflecting surfaces, to scan a photoreceptor, said apparatus comprising:a detecting system which detects an optical intensity of the laser light reflected from each of said reflecting surfaces of said polygonal mirror to measure a reflectance of said reflecting surfaces during a rotation of said polygonal mirror for scanning;a storing system which stores detection outputs from said detecting system individually;a reading system which reads one of the detection outputs stored by the storing system during the rotation of said polygonal mirror to control an emission output of said laser light incident on one of said reflecting surfaces during a subsequent rotation of said polygonal mirror, said one of said reflecting surfaces corresponding to the read one of the detection outputs;a system which corrects a reference voltage in accordance with said detection output read by the reading system to output a corrected reference voltage; anda first emission control system which controls the emission output of said laser light source on the basis of said corrected reference voltage during the subsequent rotation of said polygonal mirror.