Pioneer Corporation

Teruo Takahashi

Kazunori Matsuo

Hiroyuki Kobayashi

Hidetsugu Kubota

Yoshimichi Nishio

Hideaki Watarihana

Yasutaka Suzuki

Hiroki Goto

Takuya Abe

Masakazu Takahashi

Kiyoshi Furukawa

Susumu Yoshida

Tomomichi Kimura

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

System for reproducing information recorded on an information recording medium

An information recording-reproducing apparatus includes carrier rollers arranged in a carriage path having a width almost equal to a diameter of a large diameter disc, and a mechanical side switch PSW at one peripheral end of the carriage path. First and second optical detectors are arranged in the carriage path at an interval smaller than a diameter of the small diameter disc. The first optical detector and the side switch are arranged at an interval larger than the diameter of the small diameter disc, while the second optical detector and the side switch are arranged at an interval smaller than the diameter of the small diameter disc. The type of the disc as well as difference between the disc and an object other than the disc are determined based on the detection signals from the optical detectors and the side switch.

Carrying device for information recording medium

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

Teruo Takahashi