Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2005-06-07
2005-06-07
Robinson, Mark A. (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S507000
Reexamination Certificate
active
06903858
ABSTRACT:
An optical scanning device is disclosed that includes a rotary polygon mirror and an air current rectifying mechanism. The air current rectifying mechanism is positioned with a surface that is substantially parallel to an end surface of the rotary polygon mirror. At least one specified condition is satisfied to insure that negative pressure regions are prevented from forming on planar surfaces of the rotary scanning mirror when the scanning mirror is rotated by a scanning motor. In this manner, dust that normally tends to be deposited on the scanner mirror planar surfaces by eddy currents that form as a result of these negative pressure regions is prevented from adhering to the rotary scanning mirror surfaces. Thus, optical performance of the scanning mirror is maintained over time.
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patent: 5625482 (1997-04-01), Sugiura
patent: 6327067 (2001-12-01), Koguchi
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Hosonuma Tasuku
Kaneko Koji
Amari Alessandro
Arnold Bruce Y.
Arnold International
Fujinon Corporation
Robinson Mark A.
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