Dynamic-pressure gas bearing structure and optical deflection scanning apparatus
US5731831A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 8, 1996 |
| Grant date | Mar 24, 1998 |
| Priority date | — |
| Expiry date | Mar 8, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/121
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.