Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Hiroshige Ishibashi

Katsuya Watanabe

Takashi Kishimoto

Rie Takahashi

Yoshihiro Mushika

Osamu Kajino

Junichi Minamino

Takahiro Sato

Eiji Ueda

Takeshi Shimamoto

Yuuichi Kuze

Akira Yoshikawa

Yasuhiro Tai

Yoshiyuki Hashimoto

Kenichi Morikawa

After an optical disk drive according to the present invention has been loaded with an optical disk and before the operation of recognizing the type of the given disk is finished, the drive presumes one of multiple types of candidate optical disks, from/on which data is readable and writable using a light beam with the shortest wavelength among the candidate disks, to be the disk being driven by the motor now and gets the beam for the presumed type of disk radiated from a light source (Step (A)). Next, the drive gets the disk spun at a rotational velocity that realizes a linear velocity equal to or higher than a standardized normal velocity when data is read from the presumed type of disk (Step (B)). Thereafter, the drive starts a focus control in a situation where the spot of the beam being formed on the disk is moving on the disk at the linear velocity equal to or higher than the normal velocity (Step (C)). And then the drive performs the operation of recognizing the type of the disk by the light beam reflected from the disk under the focus control (Step (D)).

Optical disk drive for discriminating types of optical disks

An optical disk drive according to the present invention has the ability to read data from multiple types of optical disks, each of which includes at least one information storage layer. The drive includes: a driving mechanism, which is loaded with a selected one of the optical disks of the multiple types and which rotates the optical disk; an optical pickupfor irradiating the optical disk, which has been loaded into the driving mechanism, with a converged light beam, thereby generating an electrical signal based on light that has been reflected from the optical disk; and a control section (ODC) for controlling operations of the driving mechanismand the optical pickup. The control sectionincludes a right/wrong side determining section for determining, by reference to the electrical signal generated by the optical pickup, whether or not the optical diskhas been loaded into the driving mechanismwith the other surface opposed to the optical pickup

Optical disk unit and driving method therefor

An optical disc apparatus includes: a defect detecting sectionfor detecting, based on a light detection signal and with respect to a preset detection reference level, a fingerprint or a bubble on the discas a defect to output a defect detection signal; and a waveform shaping sectionto output a hold signal that holds, in response to the defect detection signal, a signal from a tracking control sectionat a level just before the defect has occurred. The apparatus is initially operated not to hold the signal from the tracking control sectioneven if there is a defect. But once a tracking failure has occurred during a read operation, settings are changed to hold the signal from the tracking control sectionagainst the defect while the read operation is retried.

Optical disc device

An optical disk apparatus according to the present invention is an optical disk apparatus for performing at least one of: recording data to a plurality of types of optical disks including a recordable optical disk and a read-only optical disk which are produced according to the BD specifications; and reproducing data from the optical disks. This apparatus includes: a means () for irradiating a management areaof an optical diskwith a light beam while not performing tracking control, and generating a track position signal (push-pull TE or phase difference TE) from light which is reflected by the management area; and a disk determination means for determining, based on the track position signal obtained from the management area, whether the optical diskmounted in the optical disk apparatus is a recordable optical disk or a read-only optical disk.

Optical disc judgment method and optical disc device

An optical disc drive according to the present invention can read data from any of multiple types of optical discs, of which the information storage layers are located at mutually different depths under their surface. When this drive is loaded with an optical disc, the servo controller of the drive changes a first type of drive signal to adjust a focus position by changing distances from the lens to the disc and/or a second type of drive signal to adjust tilt of the lens by changing the angles defined by the lens with respect to the disc a number of times, thereby changing settings to be determined by a combination of the focus position and the tilt. A signal quality rater measures multiple index values to rate the quality of a reflected light signal as the settings are changed. Then, the optical disc drive recognizes the type of the given optical disc based on those index values and reads data from the optical disc recognized.

Optical disc drive

An optical disk drive is designed to read and/or write data from/on a spiral string of tracks where land and groove tracks are alternated. The drive includes: a light source for radiating a light beam; a lens for converging the light beam; a mechanism for moving the lens; a photodetector for generating an electrical signal based on at least a part of the light beam reflected from the optical disk; and a control section for controlling the light source and the mechanism responsive to the electrical signal. While performing a seek operation by having the lens moved by the mechanism such that a target track, from/on which the data should start being read or written, is irradiated with the light beam, the control section tries to get a PLL locked by irradiating another track, which precedes the target track by at least one, with the light beam.

Optical disk drive

A motor controlling device includes an acceleration detector for detecting an acceleration of a motor; a motor driver for supplying a driving current to the motor; a heat quantity calculator for calculating a heat quantity generated in the motor at least based on an output from the acceleration detector; and a motor controller for controlling the motor driver based on the heat quantity.

Growing community of inventors

Osaka, Japan

Hiroshige Ishibashi