Light beam scanning system with photodetector oriented to preven

Details Light beam scanning system with photodetector oriented to preven Light beam scanning system with photodetector oriented to preven

1992-11-09

1995-07-25

Rosenberger, Richard A.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

250235, G01N 2184

Patent

active

054367280

ABSTRACT:
A light beam scanning system for use as a laser beam scanner in a laser beam printer has a polygonal mirror for deflecting a light beam emitted from a laser diode to scan a photosensitive drum with a scanning light beam. The scanning light beam is reflected by a mirror to a photodetector. In response to the reflected scanning light beam, the photodetector produces an output signal which is processed into a horizontal scanning signal to determine the timing to start writing information on the photosensitive drum with the scanning light beam. The photodetector has a detecting surface for receiving the reflected scanning fight beam. The detecting surface is oriented to prevent reflections therefrom of the reflected scanning light beam from traveling back to the light beam source through the mirror and the polygonal mirror.

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patent: 5087813 (1992-02-01), Negishi
patent: 5155783 (1992-10-01), Suwashita
patent: 5200611 (1993-04-01), Hattori
patent: 5264911 (1993-11-01), Nakane et al.

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