Pioneer Corporation

Yasutaka Suzuki

Kazunori Matsuo

Hiroyuki Kobayashi

Yoshimichi Nishio

Hidetsugu Kubota

Hideaki Watarihana

Teruo Takahashi

Hiroki Goto

Takuya Abe

Masakazu Takahashi

Kiyoshi Furukawa

Tomomichi Kimura

Shinichi Naohara

Susumu Yoshida

Masato Sakamoto

A temperature sensor () detects a temperature of a spindle motor () of a rotary drive unit () for rotating a disk-shaped recording medium (), and a temperature information acquiring unit (A) acquires the temperatures as temperature information. An eccentricity detector () detects a drive voltage level, and an eccentricity information acquiring unit (B) acquires the drive voltage level as eccentricity information. When a determining unit (C) determines that the temperature is higher than a predetermined temperature or that the drive voltage level is higher than a predetermined voltage, a servo controller () switches a rotation mode from constant liner velocity to constant angular velocity. That enables stable information processing over a long time with a simple strucure for constant linear velocity.

Rotation control device, method thereof, program thereof, recording medium storing the program, and information processing apparatus

For reproducing and/or recording information from/onto an optical disc, a pickup is used to detect a target track on the disc through an optical beam. In carriage servo control, movement of the pickup is servo-controlled in the radial direction of the optical disc. In this control, a tracking error signal is produced by a preamplifier. A pulse signal is produced, in which the period of the pulse signal is set to a constant amount corresponding to the accuracy of movement of the pickup. Based on the pulse signal and the tracking error signal, a carriage control signal to move the pickup is produced. The carriage control signal is then supplied to a carriage motor by a driver, so that the pickup is moved.

Optical disc player having a carriage control system relying upon a multiplied periodic signal and a tracking error signal

An information recording medium reproducing system has an insertion opening, a recording medium storing portion and a medium carrying device. Photodetectors are provided for detecting passing of the recording medium and for producing a passing signal when the medium passes. A controller is provided for controlling operation of the medium carrying device. The controller applies a discharge signal to the medium carrying device when the passing signal is not produced within a predetermined time, whereby the medium carrying device is actuated in discharge operation.

Information reproducing system having means for preventing a breakdown thereof caused by abnormal conditions

Partial information such as the beginning data of each of chapters is read from a CD and written in a HDD at a higher speed than that in a normal reproduction while the normal reproduction is carried out using a buffer memory . After the chapters relative to all CDs have been written in the HDD , reproduction is carried out in switching between the information remaining in the HDD and the information included in the CD. This configuration makes it unnecessary to record the information beforehand, and permits an unreproduciable blank in reproduction to be filled with audio information during track search or CD change while the reproduction is carried out normally.

Recording/reproducing apparatus

System for reproducing information recorded on an information recording medium

A reproducing apparatus and method for continuously reproducing data including a memory configured to store at least heading portions of respective data groups from one or more data groups recorded on a recording medium; a reproducing device configured to read at least the heading portions of one or more of the data groups from the recording medium; and a controller configured to control the memory and the reproducing device, and configured to execute a cross-fading operation, in which a portion of at least one of the data groups being reproduced from the memory are cross-faded with a portion of at least one of the data groups being reproduced from the recording medium by the reproducing device.

Reproducing device with cross-fading operation

An apparatus for detecting the absence or the presence of the occurrence of the abnormal insertion that a plurality of disc bodies each of which should be inserted separately one by one are inserted consecutively, provided with: a passing detecting device for detecting the passing of the disc body, mounted on the passing route of the disc body, and a determining device for determining the occurrence of the abnormal insertion if the detecting device detects the passing again after the detecting device detected the passing once.

Apparatus and method for detecting abnormal insertion of disc body

A first detector is provided for detecting an optical disc inserted in an opening of a reproducing system and for producing a first signal, and a second detector is provided on a reproducing device for detecting the disc carried to the device and for producing a second signal. A sensing circuit is provided for sensing a temporary reduction of a voltage of power supplied to the system and for producing a temporary reduction signal. A control means is provided to be responsive to the first signal and to the temporary reduction signal for operating a carrying device to carry the disc in an unloading direction, and in a loading direction when the disc reaches a predetermined position.

System for reproducing recording mediums

A disc reproducing apparatus is provided which is adapted to scan information tracks to read information recorded on an information recording medium. This disc reproducing apparatus comprises: determining means capable of determining an actually happened track jump, said determining being effected when a difference between a present reproducing positional information and a reference reproducing positional information is larger than a predetermined value; detecting means for detecting a present track position which is just being reproduced at a present time; and setting means for setting said predetermined value corresponding to the present track position, in accordance with a result of the detecting means.

Disc reproducing apparatus for determining a track jump

A system for reproducing recording mediums has a reproducing device, a storing device for storing a plurality of recording mediums, a moving device for relatively moving the reproducing device and storing device for reproducing a recording medium. A controller is provided to be responsive to a command for operating the moving device for positioning the reproducing device and the storing device at predetermined fixable initializing positions.

Growing community of inventors

Saitama-ken, Japan

Yasutaka Suzuki