Canon Kabushiki Kaisha

Sumitomo Electric Industries, Limited

Isshin Sato

Mikio Nakasugi

Taku Fukita

Yasuo Suzuki

Osamu Komura

Kaoru Murabe

Akihiro Fukutomi

Hideyuki Miyamoto

Tetsuya Katayama

Hiroyuki Fukuhara

Mitsuhiro Obara

Tetsuya Nishiguchi

The present invention roughens at least a partial region of an outer planar surface of at least one of an optical case and a lid of a laser scanner; thus, electrification of the optical case to be caused by friction with another member or a person is reduced, and damage to an electronic component is prevented.

Optical scanning device

A bearing device is structured to include a stator portion which includes one of a shaft and a sleeve, a rotor portion which includes the other of the shaft and the sleeve which are structured to be capable of relative rotation therebetween, a first permanent magnet mounted on the rotor portion, and a second permanent magnet mounted at a position opposed to the first permanent magnet. The rotor portion is floated up relative to the stator portion by a magnetic force working between the first permanent magnet and the second permanent magnet. The first permanent magnet is mounted on the upper end portion of the rotor portion, the second permanent magnet is mounted on the upper end portion of the stator portion, and the first permanent magnet and the second permanent magnet are provided in opposed relationship with each other in a circumferential direction perpendicular to an axial direction of the bearing device.

Bearing device and deflecting-scanning apparatus using the same

The present invention is directed to a balance correcting method for scanning optical apparatus for deflection-scanning a light beam in such an arrangement that a drive motor is of an inner rotor type in which a rotary body having a drive magnet is disposed inside a stator and a rotary polygon mirror is mounted on the rotary body so as to enable deflection scanning of the light beam, wherein a mechanical part having the rotary body is arranged as separable from an electric circuit part having the stator, the mechanical part having the rotary body is separated from the electric circuit part upon balance correction, only the mechanical part is then mounted on a balance corrector, the mechanical part is rotated by a stator as a rotating device preliminarily provided in the balance corrector, and an amount of unbalance is measured and adjusted.

Balance corrector for scanner motors and balance correcting method

In a light deflecting apparatus, a sleeve formed of ceramic material is relatively rotatably fitted onto the periphery of an axis of ceramic material, a rotary polygonal mirror is mounted to a rotor portion including the axis or the sleeve, and the rotor portion is rotated by a driving motor. The axis is a rotary axis, a metal member formed of metal is mounted to the periphery of the rotary axis, and the rotary polygonal mirror is mounted to the metal member.

Light deflecting apparatus and deflection scanning apparatus using the

A dynamic-pressure gas bearing structure includes a sleeve, a column-like shaft fitted to the sleeve, and a plurality of shallow grooves formed on the outer peripheral surface of the shaft and extending in the axial direction of the shaft. The shallow grooves are formed by grinding in which grains are aligned to the aforementioned axial direction. An optical deflection scanning apparatus is provided with such dynamic-pressure gas bearing structure.

Dynamic-pressure gas bearing structure and optical deflection scanning

An inner rotor type scanner motor rotating a rotary polygon mirror for deflection scanning is composed of two units, a rotary unit and a stationary unit. Then balancing can readily be achieved on two planes of the rotary polygon mirror and a drive magnet of the motor. The rotary unit is arranged in such a manner that a motor housing holds a bearing of a rotary member to which the rotary polygon mirror and drive magnet are fixed, and the stationary unit is arranged in such a manner that a stator coil and a magnetic member are mounted on a base.

Scanner motor

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.

Growing community of inventors

Yokohama, Japan

Isshin Sato