Optical deflector provided with scanning mirror rotatable around shaft by dynamic air pressure
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United States of America Patent
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Aug 20, 1996
Issued Date -
N/A
app pub date -
Dec 15, 1994
filing date -
Sep 16, 1993
priority date (Note) -
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Abstract
An optical deflector is provided with a scanning mirror which is rotatable about a shaft and accompanied by a sleeve and hub. The pneumatic pressure around the mirror which is located within a cavity formed by a motor case of the deflector is maintained lower than an inside pneumatic pressure of a pneumatic pressure creation arrangement. The arrangement has the shaft provided with herringbone grooves engraved on the periphery thereof and the sleeve rotatable about the shaft together with the hub and the scanning mirror. When the scanning mirror rotates about the shaft, windage loss may be reduced, and when the inside pneumatic pressure between the shaft and the sleeve is kept higher than the atmospheric pressure, the rigidity of the shaft may be maintained during the rotation of scanning mirror about the shaft.
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