Dynamic pressure bearing
AssigneeKonica Corporation
InventorsMasao Itoh, Satoshi Shibuya, Naoji Kamimura
Life of this patent
Estimating the term…
Abstract
An apparatus for supporting a rotator, comprises a radial bearing and a thrust bearing, wherein at least one of a radial bearing surface, a supported surface of the rotor facing the radial bearing surface, a thrust bearing surface and a regulated surface of the rotor facing the thrust bearing surface is a rough surface having a center-line mean roughness not less than 0.3 and a surface facing the rough surface is a smooth surface having a center-line mean roughens less than 0.3.
Claims16
An apparatus for supporting a rotator having a rotation axis, comprising:
- a radial bearing having a radial bearing surface for supporting the rotation axis of the rotator;
- a thrust bearing provided at least one side of the radial bearing and having a thrust bearing surface for regulating a movement of the rotator in an axial direction;
- the rotator having a supported surface facing the radial bearing surface and a regulated surface facing the thrust bearing surface;
- wherein at least one of the radial bearing surface, the supported surface, the thrust bearing surface and the regulated surface is a rough surface having a center-line mean roughness not less than 0.3 and a surface facing the rough surface is a smooth surface having a center-line mean roughens less than 0.3.
An apparatus for deflecting a laser beam, comprising:
- a rotor having a rotation axis, a circumference, a first and second ends;
- a polygonal mirror provided around the circumference of the rotor, for deflecting the laser beam;
- a magnet provided on at least one of the first and second ends;
- a stator coil provided so as to face the magnet;
- a radial bearing having a radial bearing surface for supporting the rotation axis of the rotator;
- a thrust bearing provided at least one side of the radial bearing and having a thrust bearing surface for regulating a movement of the rotator in an axial direction;
- and
- the rotator having a supported surface facing the radial bearing surface and a regulated surface facing the thrust bearing surface;
- wherein at least one of the radial bearing surface, the supported surface, the thrust bearing surface and the regulated surface is a rough surface having a center-line mean roughness not less than 0.3 and a surface facing the rough surface is a smooth surface having a center-line mean roughens less than 0.3.
An apparatus for forming an image, comprising:
- a photoreceptor;
- a laser beam generator;
- and
- a laser beam deflector for deflecting the laser beam so that the photoreceptor is scanned with the laser beam and the image is formed on the photoreceptor;
- the laser beam deflector including
- a rotor having a rotation axis, a circumference, a first and second ends;
- a polygonal mirror provided around the circumference of the rotor, for deflecting the laser beam;
- a magnet provided on at least one of the first and second ends;
- a stator coil provided so as to face the magnet;
- a radial bearing having a radial bearing surface for supporting the rotation axis of the rotator;
- a thrust bearing provided at least one side of the radial bearing and having a thrust bearing surface for regulating a movement of the rotator in an axial direction;
- and
- the rotator having a supported surface facing the radial bearing surface and a regulated surface facing the thrust bearing surface;
- wherein at least one of the radial bearing surface, the supported surface, the thrust bearing surface and the regulated surface is a rough surface having a center-line mean roughness not less than 0.3 and a surface facing the rough surface is a smooth surface having a center-line mean roughens less than 0.3.
Dependencies are inferred from the claim text.