Matsushita Electric Industrial Co., Ltd.

Kazuo Teramae

Kozo Ezawa

Masanao Wakikawa

Terumi Tatsumi

Hironori Okazawa

Masashi Itoh

A turntable for a disk storage medium includes disk mounting section, shaft center boss and ribs. The disk mounting section includes disk mount surface, center boss and inner side surface. The disk mount surface is used to mount the disk medium thereon. The center boss has an outer side face that engages with a center hole of the disk medium. The inner side face defines a space that has a center axis aligned with that of the center boss. The shaft center boss includes an outer side face and a hole into which a rotating shaft is inserted so as to transmit a driving force to, and rotate, the disk medium. The ribs join the outer side face of the shaft center boss and the inner side face of the disk mounting section together so that through holes are formed between these side faces.

Turntable for disk storage medium and disk drive including the turntable

An optical disk apparatus capable of stably moving an optical head is provided. The apparatus includes an optical head for recording data to or reproducing data from a disk, a first guide member having an axis substantially parallel to the disk for supporting the optical head in such a manner that the optical head is moved along the axis, a second guide member for limiting rotation of the optical head about the axis, a rack mounted on the optical head and having a reference pitch line substantially parallel to the axis, a pinion for moving the optical head by the pinion being engaged with the rack and being rotated, and a pressing member for pressing the rack toward tie pinion. The vector of a force exerted by the pinion on the rack in response to the pressing member pressing the rack toward the pinion substantially intersects the axis.

Mechanism for moving an optical head in an optical disk apparatus

A stereophonic electromagnetic pickup cartridge in which each of the right- and left-channel yokes is formed by folding a thin strip of a magnetic material over itself many times like pleats into a U-shape; coils are mounted on the yokes; the bases of the yokes are crossed so that the bases of the yokes are respectively disposed along the lines which are crossed by 90.degree. respectively with the axes of the maximum sensitivity of the right- and left-channels are formed; and an armature is disposed at the open ends of the yokes. Mass production at less costs of high-quality yokes with minimum eddy current loss becomes possible.

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Hirakata, Japan

Kazuo Teramae