Matsushita Electric Industrial Co., Ltd.

Shingo Sagata

Kiyoyuki Suenaga

Yuji Tanaka

Makoto Taromaru

Takeshi Watanabe

Kazuo Matsumoto

Koji Muraoka

Hiroki Kokubu

Yuichi Uchikawa

Masanari Esaki

Hirohisa Koizumi

Hiroyuki Gondo

Masanobu Aramaki

Kouji Muraoka

Fumihide Maeda

Hidetaka Taguchi

Shinichi Tokumaru

Hiroyuki Gondou

Hisashi Arai

Takeshi Sugimoto

Takashi Morishita

The present invention includes a frame, an optical pick-up module fixed to the frame and a circuit board forming a control circuit fixed to the frame. The frame has fixing parts to other members.

Optical disc device having fixing parts for directly fixing a frame of the optical disk device to an electronic device

It is an object to provide an optical disk driving method and apparatus with the consumption power reduced. The optical disk driving apparatus includes a synchronizing clock generator 6 for generating a clock in synchronism with a reproduced signal, a synchronized state discriminator 17 for deciding if the frequency of the reproduced signal is within a synchronized range, and a spindle controller 18a for controlling the spindle to be stopped from being driven and thus left running by inertia when the frequency of the reproduced signal is decided to be within the synchronized range, but controlling the spindle to be driven so that the frequency of the reproduced signal can be pulled in the synchronized range immediately before the frequency of the reproduced signal goes out of the synchronized range. A spindle controller 18b in another example of the invention, when the frequency of the reproduced signal is decided to be out of an allowable synchronized range, controls the spindle motor 2 to be driven by the driving output with its peak-to-peak value and driving time changed in accordance with the current revolution rate so that the frequency of the reproduced signal can be pulled in the allowable synchronized range.

Optical disk driving method and apparatus

A servo control system for controlling position of a readout head such as a magnetic or optical head which records, reproduces or erases information on or from a magnetic or magneto-optical disk. This servo control system includes an actuator for moving the head toward a required position on the disk, a position detecting circuit for detecting a position of the head relative to the disk, and a signal processing circuit for processing an output signal from the position detecting circuit to provide a control signal to the actuator. When a value of the signal from the position detecting circuit falls within a preselected range, a controller deactivates a servo control operation of the signal processing circuit and modifies controlled parameters used in the servo control operation in response to a disturbance such as vibration of the system.

Servo control system for head recording and/or reproducing information

An optical disk apparatus equipped with an objective lens for converging light from a light source onto a track formed on an optical disk, the objective lens being arranged to be movable and an error detecting section for detecting a difference in position between the light converged by the objective lens and the track on the optical disk. Included in the servo section of the optical disk apparatus are an amplifier for amplifying an output of the error detecting section with an amplification factor which is variable and a filter circuit for cutting off a frequency component of an output of the amplifying means, the cutoff frequency being variable. On the basis of the output of the filter circuit, a moving device moves the objective lens so that the difference between the converged light and said track is reduced. The amplification factor of the amplifier and the cutoff frequency of the filter circuit are determined in correspondence with the position of the objective lens. These amplification factor and cutoff frequency are prestored in a memory so that the corresponding amplification factor and cutoff frequency are read out therefrom in accordance with the current position of the objective lens.

Optical disk apparatus

Growing community of inventors

Tamana, Japan

Shingo Sagata