Dynamic-pressure gas bearing structure and optical deflection sc

Details Dynamic-pressure gas bearing structure and optical deflection sc Dynamic-pressure gas bearing structure and optical deflection sc

1996-03-08

1998-03-24

Hecker, Stuart N.

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384115, 384118, 369 4422, G01D 1516, F16C 3206

Patent

active

057318310

ABSTRACT:
A dynamic-pressure gas bearing structure includes a columnar shaft made of a silicon-nitride-based ceramic sintered body, a hollow cylindrical sleeve opposed to the shaft as keeping a clearance in a radial direction, the sleeve being made of a silicon-nitride-based ceramic sintered body, and at least three flat face portions located on a peripheral surface of the shaft and at equal intervals to the circumference along the peripheral surface. The flat face portion includes a plurality of unit planes continuously formed at predetermined angles to a direction of the circumference on the peripheral surface of the shaft. The unit planes are formed so as to extend substantially in parallel with an axial direction of the shaft.

REFERENCES:
patent: 4747705 (1988-05-01), Agrawal
patent: 5270737 (1993-12-01), Nakasugi et al.
patent: 5315196 (1994-05-01), Yoshida et al.
patent: 5357272 (1994-10-01), Watanabe et al.
patent: 5434695 (1995-07-01), Saito et al.
patent: 5593230 (1997-01-01), Tempest et al.
patent: 5659445 (1997-08-01), Yoshida et al.

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