Measuring instrument of polygon-mirror motor

Details Measuring instrument of polygon-mirror motor Measuring instrument of polygon-mirror motor

2005-11-01

2008-12-02

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

Position or displacement

Position transverse to viewing axis

Reexamination Certificate

active

07460249

ABSTRACT:
A measuring instrument of polygon mirror motors includes a first light source, a first photo detecting element for detecting a first reflected light beam, i.e. first measuring light beam emitted from the first light source and reflected from the polygon mirror, a second light source, a second photo detecting element for detecting a second reflected light beam, i.e. second measuring light beam emitted from the second light source and reflected from the polygon mirror; and a calculator for performing a calculation based on a time difference between an output from the first photo detecting element and an output from the second photo detecting element. The calculator outputs at least one of an eccentricity and a level difference between facets of the polygon mirror.

REFERENCES:
patent: 5105296 (1992-04-01), Cho et al.
patent: 7193730 (2007-03-01), Higashi et al.
patent: 2005/0213102 (2005-09-01), Morita
patent: 01-232226 (1989-09-01), None
patent: 2-204713 (1990-08-01), None
patent: 02-204713 (1990-08-01), None
patent: 5-227710 (1993-09-01), None

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