Kabushiki Kaisha Toshiba

Kiyotaka Uchimaru

Akihiro Kasahara

Koichi Nagai

Naomasa Takahashi

Masayuki Sekimura

An optical disk drive has a drive unit for driving a disk and an optical head for focusing a laser beam onto the disk. The optical head has a light source for emitting the laser beam, a galvanomirror for correcting a light passage of the emitted laser beam, and a lens for focusing the laser beam from the galvanomirror onto the disk. The galvanomirror has a rocking portion being electrically chargeable, and one surface of the rocking portion having a reflection surface for reflecting the laser beam. The rocking portion is rockably supported by first end portions of supporting portions. Second end portions of the supporting portions are connected to a second plate (fixing portion). The second plate has an opposed portion opposed to the other surface of the rocking portion with a predetermined gap interposed. Electrically chargeable electrodes are provided on the opposed portion of the second plate, for electrostatically driving the rocking portion thereby reflecting the laser beam at a desired angle. The other surface of the rocking portion is provided with recess portions for reducing an air pressure caused when the rocking portion is rocked.

Galvanomirror and optical disk drive using the same

An optical disk drive which is a data recording device or a data reproducing device having two movable members. The first movable member has two objective lenses on it. A magnetic circuit is secured to the second movable member to apply a magnetic field to the tracking coil attached to the first movable member. The first and second movable members can rotate around a shaft. The first objective lens or the second objective lens is selected and used in accordance with the type of the disk used. The device can therefore record data on or reproduce data from disk of different types. Further, since the angle at which the second movable member is inclined to the shaft remains unchanged, the device can record data on or reproduce data from a disk, without causing coma-aberration or the like, no matter whether the first object lens or the second objective lens is selected and used.

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Tokyo, Japan

Kiyotaka Uchimaru