Pioneer Corporation

Kenichi Oono

Yoshio Sasaki

Takashi Nakamura

Ryuichiro Yoshimura

Akio Fukushima

Keiichi Takagi

Hidenori Nakagawa

Takashi Nakai

Naoki Yamada

Yuichi Mizuuchi

Tomonori Nakada

Hajime Ishizuka

Yasushi Oshima

Eiji Konosu

Kazumasa Nakamura

Tak Kai

Shinzo Kawakami

Takehiro Otsuki

Takayuki Yamamoto

Hiroki Yamaguchi

Kouji Harimoto

An information recording apparatus () is provided with: a first judging device () for judging whether or not a tracking error signal is greater than or equal to a first threshold value; a detecting device () for detecting, as a detection angle, a rotation angle of an information recording medium () when it is judged that the tracking error signal is greater than or equal to the first threshold value; and a second judging device () for judging whether or not the judgment that the tracking error signal is greater than or equal to the first threshold value is performed at the same detection angle.

Information recording apparatus and method, information reproducing apparatus and method, and computer program

An optical axis shift correcting device is provided in an optical information device including an irradiation element for applying a laser, an optical system for guiding a laser applied to an optical disc having a recording track, and a light reception element for receiving the light from the optical disc generated by the guided laser via the optical system. The optical axis shift correcting device includes a jitter acquisition element, an optical axis modification element modifying the direction of the optical axis with respect to the light reception element, and a control element controlling the optical axis modification element to reduce the shift when the acquired jitter amount exceeds a predetermined threshold value. The optical axis shift correcting device thus corrects the optical axis light shift on the surface of the light reception element with respect to the radial direction of the optical disc set in the optical information device.

Optical axis shift correcting device and method, and computer program

An information recording apparatus () is provided with: a first judging device () for judging whether or not a tracking error signal is greater than or equal to a first threshold value; a detecting device () for detecting, as a detection angle, a rotation angle of an information recording medium () when it is judged that the tracking error signal is greater than or equal to the first threshold value; and a second judging device () for judging whether or not the judgment that the tracking error signal is greater than or equal to the first threshold value is performed in synchronization with rotation of the information recording medium and at the same detection angle in a row.

Information recording device and method, and computer program

In an optical disk manufacturable by a conventional recording medium manufacturing method and that is capable of performing recording with an information recording apparatus used to perform recording on conventional recording mediums, and a data recording apparatus for recording contents data, an optical disk has a structure in which a first substrate and a second substrate are bonded together, the first substrate is provided with a recording layer in which contents data is recorded, and the second substrate is provided with a visual information recording layer in which information enabling visual recognition of, for example, the contents of contents data or a title of the contents data is recorded as visual information.

Optical recording medium and data recording device

When the position of the pickup is normalized, a lead screw is rotated by a stepping motor to move the pickup to the outermost circumferential position, whereby a preset counter is preset to the maximum value CTout corresponding to the outermost circumferential position. The counter counts proportionally to the number of driving pulses to be supplied to the stepping motor, the lead screw rotates till the counting value of the counter gets &ldquo;0&rdquo;, so that the pickup moves near the outermost circumferential track of the optical disk in the lead-in area to make the set up. The shape of the tooth flank of the lead screw and the inclination of the engaging projections are designed such that the step out is caused between the engaging projections and the lead screw when the pickup is moved to the outermost circumferential position. Even if this step out is caused, the engaging projections only engage strongly with the lead screw

Information recording/reproducing apparatus with details of the pickup support unit

Growing community of inventors

Saitama, Japan

Kenichi Oono