Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Kouretsu Boku

Yoshiaki Komma

Hideki Aikoh

Kanji Wakabayashi

Takahiro Yamada

Kenichi Tanaka

Hideki Hayashi

Takao Hayashi

Akira Yoshikawa

Tomio Yamamoto

Toshiaki Takasu

Makoto Takashima

Hirotaka Endou

An information recording device including a controller records information in a write-once optical disk group including one or a plurality of write-once optical disks. When recording new data, the controller calculates a residual quantity of an alternate area. The calculation of the residual quantity of the alternate area corresponds to a subtraction of a first consumption size and a second consumption size from a size of the alternate area of the write-once optical disk group. The first consumption size is a size of the alternate area already consumed when the data recorded in the write-once optical disk group was erased. The second consumption size is an estimated size of the alternate area to be consumed when the data recorded in the write-once optical disk group is erased. The controller records the new data when the residual quantity is greater than or equal to a third consumption size.

Information recording device and information recording method

A highly reliable optical pickup which is not likely to collide with an optical disk is provided. Relative positions of two objective lensesand(along a focus direction) on a lens holderare determined so that, while the objective lenshaving a longer working distance is focused on an optical disk, the objective lenshaving a shorter working distance and a protective memberare at positions which are more distant from the optical diskthan a height h of a protrusion which is present in an inner peripheral region of the optical disk optical disk

Optical pickup device and information processing apparatus incorporating the optical pickup

An optical disk device of the present application includes: a turntableincluding plural induction groovestoas concave portions radially extending from vicinity of a center of the turntableand having open portions in an outer periphery of the turntableand plural through-holestopenetrating bottom facestoon the vicinity of the center side of the plural induction groovestoand a top face of the turntable; and an outer rotor type spindle motorprovided with plural finstoas convex portions on a rotor on a side face thereof. The optical disk device of the present application utilizes an airflow generated by rotation of the rotor of the spindle motorand the turntablein conjunction therewith as a dust removing wind for removing dust attaching to an objective lens side area.

Optical disc device and method for controlling optical disc device

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Kyoto, Japan

Kouretsu Boku