Sony Corporation

Mitsuhiro Ueno

Hiroshi Ikuta

Yuji Shishido

Fumiharu Sudo

Kentaro Soeda

Takashi Mochida

Toru Nakahara

Taiji Ito

Takashi Nakao

Takeshi Sano

Keiichi Shibata

Tamotsu Ishii

Shinji Ohta

Shigeo Kobayashi

Yasuyuki Takeshita

Kyohei Iwamoto

Hiromitsu Komatsu

Kazutaka Nakajima

An optical communication device, for performing communication between spatially separated points by using one or more laser beams, includes an angle correction device that corrects a direction of a light receiving system and an emission optical axis correction device, in which an angle error which is not corrected by the angle correction device is detected by a light receiving angle detection device, and the emission optical axis correction device is controlled according to a detected error amount, and an emission optical axis is corrected.

Optical communication device

A structure for securing a spindle motor ( ) supported on a motor substrate ( ) to a chassis ( ). The motor substrate ( ) and the chassis ( ) are coupled by at least three coupling sections ( ). At least two of the coupling sections ( ) are fixed support members ( ) which hold and space the motor substrate ( ) and the chassis ( ) from each other at a prescribed distance. The remaining coupling section is an adjusting support member ( ) that holds the motor substrate ( ) and the chassis ( ) from each other at a variable distance. Rigid holding means is incorporated in the adjusting support member ( ) and holds the motor substrate ( ) and the chassis ( ) so that the motor substrate ( ) and the chassis ( ) remain rigid.

Motor securing structures and disc drive

A disc drive apparatus performing recording and/or reproduction on a disc-shaped recording medium in which the top plate of a body is in close proximity to the disc-shaped recording medium and the top plate is provided with air passages that extend in radial directions of the disc-shaped recording medium. This disc drive apparatus prevents floatation of the disc-shaped recording medium without causing cost increase.

Disc drive apparatus

There is provided an iron core coil motor using an iron core coil, as a stator coil, formed by winding a coil winding around an iron core. Floating in the shaft direction of rotor is prevented with an attracting force generated by offsetting the center of magnetism of iron core of coil and the center of magnetism of rotor magnet and moreover the attracting force is set to 0.8 to 2.0 times the total weight of the rotating elements including rotor. Thereby, generation of noise and vibration can be controlled.

Iron core coil motor and disk drive

Disclosed is a disk rotating mechanism equipped with an automatic aligning mechanism in which the number of parts is reduced and in which an improvement in assembly operability and a reduction in cost are achieved. The automatic aligning mechanism includes a case body made of a non-magnetic material and formed as a flat cylinder with one end surface closed, two or more balance members provided so as to be freely movable in the inner space (movement space) of the case body, and an attracting magnet adapted to attract the balance members when the rotating mechanism is at rest or rotating at low speed, wherein the case body is supported by the spindle shaft of a spindle motor and wherein the closed end surface (table portion) thereof serves as the table portion of a turntable.

Disk rotating mechanism

A rotation control device capable of suppressing vibrations of a rotation unit produced due to changes in weight unbalances of the rotation unit. On a disc rotation control device 2, made up of a driving shaft 8 rotated along with an optical disc 90, a turntable 9, a motor rotor 10 and a magnet 15 mounted on the motor rotor 10, balancer members 6, 7 are mounted so that the balancer members 6, 7 are rotatably supported on the driving shaft 8. The disc rotation control device 2 causes rotation of the rotation unit such that a synthesized center of gravity of the rotation unit offset from the center of rotation by the unbalances of the optical disc 90 and the balancer members 6, 7 will coincide with the center of rotation.

Rotation control apparatus

A magnet is provided which holds spherical balancers in the central portion of a rotor when the rotation of the rotor is stopped. When rotations of the rotor is started, a larger torque T.sub.0 is transmitted from the rotor to the balancers. Thus, the balancers quickly start rotating. When the rotor rotates at high speed, the centrifugal force separates the balancers from the magnet and moves the same to the outer wall portion of the rotor. At this time, a torque T.sub.0 which is transmitted from the rotor to the balancer is reduced so that the balancers are moved in the circumferential direction. Thus, the automatic aligning operation is performed. The number (n) of the balancers is made to be a value obtained by the following equation:

Growing community of inventors

Tokyo, Japan

Mitsuhiro Ueno