Matsushita Electric Industrial Co., Ltd.

Tsuyoshi Kakuta

Fuminobu Furukawa

Hideru Goto

Nobuo Jikuya

Masayuki Shiwa

Kazuhisa Ide

Kensei Fukuda

Yoshinobu Soeda

Junichi Mutoh

Hirohiko Oowaki

Youichi Maehara

Minoru Nagata

An actuator device, an optical disk device and an information playback device comprising: an objective lens for focusing a light on a recording and/or playback face of a recording medium; a lens holder for holding the objective lens; a suspension for elastically supporting the lens holder; and an actuator base for supporting the suspension. The lens holder has a portion on the opposite side in the optical axis of the objective lens with respect to the actuator base.

Actuator device, optical disk device, and information playback device

The invention provides a motor which can reduce a generation of a cogging, has a thin size, and can generate a strong torque. In a motor having an armature including a back yoke formed in a cylindrical shape and a wound coil and a magnet formed in a cylindrical shape and magnetized by a plurality of magnetic poles on a cylindrical circumferential surface, the back yoke forms a convex portion protruding from the back yoke toward the magnet in a current switching portion of the coil. The invention further provided a disc apparatus using the motor mentioned above.

Motor having characteristic structure in armature and disc apparatus

The invention provides a disc drive apparatus which is suitable for making the apparatus compact, light and thin and make it possible to automatically mount and discharge the disc. The disc drive apparatus has pick-up means and transfer means, and the transfer means has medium driving means, synchronous driving means and positioning means which is brought into contact with an outer peripheral edge of the disc. Accordingly, the disc can be transferred in a direction of a disc surface and can be positioned by the positioning means.

Disc drive apparatus of slot loading type

A disk apparatus comprises a tray for mounting a disk thereon, a lock arm for locking the tray to a main body chassis and releasing this locking, a coil for operating the lock arm by an electromagnetic force, a coil holder for holding the coil and transmitting the electromagnetic force to the lock arm, a magnet for applying a magnetic flux necessary for the operation, a rail for holding the tray to the main body chassis and guiding an accommodation/ejection operation, a push block for pushing out the tray, a push spring for operating the push block, an eject button pushed down when the user wants to eject the tray, a detention switch for detecting the push-down of the eject button, and a controller for applying a voltage to the coil upon receiving the detection information. The entire thickness of the tray lock mechanism is composed no more than 5 mm and is accommodated in the rear internal space of the recess so that a disk apparatus reduced in the thickness in the height direction of the outer case is presented.

Disk apparatus with sliding tray and lock arm for preventing sliding tray movement

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Kurume, Japan

Tsuyoshi Kakuta