Polygon mirror rotor and polygon mirror scanner motor having suc

Details Polygon mirror rotor and polygon mirror scanner motor having suc Polygon mirror rotor and polygon mirror scanner motor having suc

1995-04-25

1997-01-21

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359198, 359216, 359217, 359855, G02B 2608

Patent

active

055964435

ABSTRACT:
A polygon mirror rotor includes a ceramic ring of a generally hollow cylindrical shape having a cylindrical inner surface serving as a sliding surface of a radial hydrodynamic bearing and a pair of end surfaces each serving as a sliding surface of a thrust hydrodynamic bearing. A plastic ring is fixedly fitted over the ceramic ring, and a polygon mirror made of aluminum is fixedly fitted over the plastic ring by shrinkage fit. The plastic ring has a thermal expansion coefficient greater than that of the ceramic ring as well as greater than that of the aluminum polygon mirror, thereby providing a polygon mirror rotor which does not adversely affect the jitter characteristic of a motor incorporating the rotor.

REFERENCES:
patent: 4984881 (1991-01-01), Osada et al.
patent: 5373391 (1994-12-01), Isobe et al.

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