Victor Company of Japan, Limited

Yukihiro Kishima

Masatsugu Kitamura

Tsuyoshi Ono

Hideo Onoye

Yutaka Morita

Fumiaki Ohno

Takashi Saito

Tatsuya Miki

A plurality of motors are arranged on opposite surfaces of a single magnetic base plate such that they are magnetically isolated from each other by the base plate. Such an arrangement prevents the motors from magnetically interfering with each other and, thereby, allows them to be positioned as close to each other as possible, in order to cut down the overall size of an apparatus in which the motors are installed.

Arrangement for mounting a plurality of motors

A record disc playing apparatus has a tone arm position detecting device which comprises a position detection part comprising a plurality of reading elements aligned in line, a code part comprising a plurality of rows of code patterns shifted in the direction of alignment of reading elements and extending along substantially perpendicular directions to the alignment direction of reading elements, and an encoder which is supplied with the output signal of the position detection part and produces address signals according to the relative position of the position detection part and the reading part. One of the code part and the position detection part is fixed and the other unitarily undergoes displacement with a tone arm of the record disc playing apparatus. The position detection part relatively scans the code patterns of the code part, the code patterns have combinations of existence and non-existence portions in the alignment direction of the reading elements, the combinations are arranged differently according to the position of the relative scanning by the position detection part.

Automatic record playing apparatus having a tone arm position detecting

A pickup arm is equipped with a photo sensor assembly for detecting non-recorded portions on a disk. The sensor is located in such a position that horizontal distance between the stylus tip and the detecting point of the sensor measured in the direction of the radius of the turntable is substantially constant throughout the possible rotational angle of the arm. The rotational angle of the arm is measured and is modified by a given angle corresponding to the above mentioned distance. When this distance deviates from a standard value on replacement of the same with another, the variation may be readily corrected by manipulating a potentiometer. Prior to performing an automatic playback, the disk is scanned by the sensor and signals indicative of the arm angles corresponding to the non-recorded portions are stored. After scanning, the arm is controlled by comparing the actual angle of the arm with the prestored angles, to place the stylus on a right position on the disk to perform automatic playback in accordance with programmed information.

Programmable automatic record player

A record disc playing apparatus comprises a horizontal drive motor for imparting a horizontal rotational force to a tone arm an address signal generating device for generating an address signal corresponding to a horizontal rotational angle position of the tone arm and a control device including a memory device for storing the magnitude of an inside force to be produced on the tone arm in correspondence with the horizontal rotational angle position of the tone arm. The address signal generating device supplies the generated address signal to the control device. The control device reads out the magnitude of the inside force from the memory device corresponding to the supplied address signal, produces a signal for cancelling the inside force at the rotational angle position of the tone arm corresponding to the read out magnitude of the inside force and supplies the same to the horizontal drive motor.

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Yokohama, Japan

Yukihiro Kishima