Clarion Co

Morihiko Uchida

Tetsuya Suzuki

Hiroto Handa

Yoshikazu Kagawa

Takahiro Sugiyama

There are provided: an optical pickup feed mechanism () that detects a disk signal; a disk loading mechanism () that feeds a disk D by means of a loading roller () that is driven by a loading motor (); a mechanism control section () that controls drive of the loading motor (); and an authentication control section () that authenticates the authorized user and outputs a disk ejection instruction to the mechanism control section () if the registered password and disk ejection instruction are input. The authentication control section () is provided with a time setting section () that stores a set time length in memory (), a timer () that measures time, and a time decision section () that determines lapse of the set time length in accordance with the time length stored in the memory section () and the time measured by the timer ().

Disk drive device

There are provided: an optical pickup feed mechanism () that detects a disk signal; a disk loading mechanism () that feeds a disk D by means of a loading roller () that is driven by a loading motor (); a mechanism control section () that controls drive of the loading motor (); and an authentication control section () that authenticates the authorized user and outputs a disk ejection instruction to the mechanism control section () if the registered password and disk ejection instruction are input.

Disk drive unit

An objective lens for an optical disc includes a positive single lens, disposed between a light source and the optical disc. The objective lens has a first surface directed to the light source and a second surface directed to the optical disc. The first surface has a convex shape and both the first surface and the second surface are aspheric. The objective lens satisfies the following condition: 1.0&lt;.vertline.R2/R1.vertline.&lt;1.2, where R1 is the paraxial radius of curvature on the light source side surface and R2 is the paraxial radius of curvature on the optical disc side surface.

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Tokyo, Japan

Morihiko Uchida