Fujitsu Corporation

Junichi Ichihara

Akihiko Makita

Koichi Ogawa

Shinichi Ohtsuka

Provided is a storage apparatus in which the resonant frequency of carriage driving coils is high and precision in positioning a carriage is excellent. The storage apparatus is, for example, an optical disk drive having rails laid parallel to one radius of a disk, and able to read or writing data from or on the disk using a carriage movable along the rails. The carriage is moved using driving coils mounted on the flanks of the carriage and magnetic circuits each composed of a permanent magnet and yokes which are located outside the carriage. The driving coils are each shaped like a parallelepiped whose sides extending in a direction along the flank of the carriage are longer than other sides extending in a direction perpendicular to the flank. The permanent magnet or yokes of each magnetic circuit is opposed to a plane containing the long sides of each of the parallelepiped-shaped driving coils. Consequently, the rigidity of the carriage driving coils has been raised and precision in positioning the carriage has been improved.

Storage apparatus offering improved precision in positioning carriage relative to disk

An optical disk apparatus includes a spindle motor for rotating a mounted optical disk, and a swing-motion type optical head apparatus. The swing-motion type optical head apparatus scans the optical disk in a radial direction of the optical disk by moving the objective lens. The head apparatus is made to swing about a swing axis in a plane parallel to a recording surface of the mounted optical disk. The swing-motion type optical head apparatus includes an arm carrying the objective lens thereupon, and provided at the first side of the mounted optical disk. A supporting member is provided for supporting the arm so as to enable the arm to swing about the axis. Driving device are provided for causing the arm to swing. The supporting member and the driving device are provided at a location outside the optical disk when viewed in a direction perpendicular to the recording surface. The mounted optical disk has a level within a height of the supporting member and the driving device, such that the supporting member and the driving device extend from the first side of the mounted optical disk to a second, opposite side of the mounted optical disk.

Compact optical disk apparatus having a swing-motion optical head

A head positioner for a storage disk includes an antifriction bearing supported by a stationary base, a first pivotable member pivotably supported by the antifriction bearing, a second pivotable member having a read/write head, a flexible member pivotably supporting the second pivotable member by the first pivotable member, and a driving unit for generating a first driving force causing the second pivotable member to pivot.

Head positioner having pivotable members

An optical semiconductor apparatus includes a laser diode for producing an optical beam, a base body formed with a first reference surface adapted for engagement with an external apparatus and a second reference surface separated from the first reference surface with a predetermined distance, and a subcarrier member having a principal surface for carrying the laser diode thereon said principal surface, wherein the subcarrier is mounted upon the base body in an abutted state such that the principal surface establishes an intimate engagement with the second reference surface. The base body is formed with a depression on the second reference surface so as to accommodate therein the laser diode when the subcarrier member is mounted upon the base body together with the laser diode that is mounted upon the principal surface.

Semiconductor optical apparatus having an improved precision for the

An electromagnetic bias coil for applying a magnetic bias field to a recording bit of a magneto-optical recording disk apparatus includes a yoke made of soft magnetic material, such as soft iron. The yoke surrounds an outer perimeter surface and a bottom surface of the coil. A light beam and optical system are arranged in an opening in the yoke. The yoke reduces the magnetic resistance of the coil, increases the magnetic field intensity at the recording bit, and reduces the current needed to achieve an adequate magnetic field intensity. The operating temperature of the coil is therefore improved.

Growing community of inventors

Kawasaki, Japan

Junichi Ichihara