Hydrodynamic bearing apparatus and deflection scanning apparatus having same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Apr 23, 2002
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N/A
app pub date -
Apr 20, 2000
filing date -
Apr 22, 1999
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Abstract
A shaft integral with a rotary polygon mirror is fitted in a sleeve so as to be rotatable, and the bearing clearance is filled with a lubricant. The lubricant comprises a base oil comprising a mixed oil consisting of a plurality of components whose vapor pressures are equal or close to each other. Suitably combining components of different viscosities makes it possible to prepare the lubricant so as to have such a viscosity to match with the bearing characteristics. Selection of components having a little difference in vapor pressure prevents viscosity change due to volatilization of a specific component. Thus, the viscosity change of the lubricant in the bearing clearance is prevented.
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