Sanyo Electric Co., Ltd.

Ichiro Takahara

Tadahiko Yabu

Hideki Ishida

Takaya Kamimura

Masaaki Azumi

Kazuo Shigetomi

Takashi Miwa

Hironosuke Ikeda

Masaru Yamano

Makoto Yamada

Kazuo Ito

Toshiyuki Kudo

Hiroyoshi Hashimoto

Jihei Hujita

Yoshiharu Toyoshima

Yuzo Yamamoto

To accurately move a pickup 31 along a radial line of an optical disc in an optical disc apparatus for recording signals on both sides of the disc or reproducing the signals from the both sides, the pickup 31 is mounted on a support base 30 coupled to transport means and movable by being guided by a U-shaped guide assembly 5 which is fixedly and accurately positioned on a chassis carrying a disc drive motor. The guide assembly 5 comprises a pair of straight travel guide portions disposed in parallel to each other on opposite sides of the plane of rotation of the disc, and a circular-arc guide portion interconnecting the two guide portions. When reproducing the recorded signals, the pickup 31 accurately reciprocatingly moves on the disc radial line along the straight travel guide portions, and when the reproduction position is changed from one side of the disc to the other side, the pickup quickly moves upward or downward along the circular-arc guide portion.

Pickup transport device for optical disc apparatus

Record player

A jitter correcting system is provided in a video reproducing apparatus for reproducing a composite video signal of a given standard television system to be connected to a monitor television receiver including an automatic frequency control for a horizontal oscillator, comprising a circuit for phase modulating the horizontal synchronizing signal of the reproduced composite video signal, by the amount associated with the phase difference between the composite video signal to be applied to the picture tube of the monitor television receiver and the output signal of the automatic frequency control of the monitor television receiver, for providing a modified composite video signal a phase modulated horizontal synchronizing signal. The system further comprises a circuit for generating a pseudo video composite signal including vertical and horizontal synchronizing signals and a marking signal in the video signal phase region wherein the horizontal synchronizing signal has been phase shifted as compared with that of the standard television system of the video reproducing apparatus for applying the said pseudo composite video signal through the jitter correcting system to the monitor television receiver, whereby the phase modulating circuit can be adjusted while observing the marking indication caused by the marking signal appearing on the screen of the picture tube.

Jitter correcting system using a pseudo composite video signal for use

A video disc player utilizable with a flexible foil-type information carrier disc adapted to be rotated at its center at a relatively high speed while hovering on a rotation-induced air cushion above a stationary platform. The video disc player has a table structure including the platform and a disc receiving chamber designed such that, even if the video disc is inserted thereinto together with a disc envelope accommodating the video disc therein, the disc is drawn out of the envelope and subsequently fed onto the platform and that the video disc, which has been resting on the platform, can be fed into the envelope as the empty envelope is inserted into the disc receiving chamber.

Video disc player

A video information reproduction circuitry for use in a video disc player of a type utilizing a combination of a scanning transducer and a flexible foil-type disc record having at least one surface formed with a spirally extending information-carrier groove in which the scanning transducer is slidingly engaged during reproduction of video information, is provided with a drop-out compensation circuit for substantially avoiding a possibility of color streaks and black and white dots, which may otherwise occur on a picture tube.

Video information reproduction circuitry having drop-out compensation

A stylus grinding device for use in a video disc player comprises a rotary grinding disc adapted to be rotated at its center during a grinding operation subject to the pickup stylus. The stylus grinding device is designed such that the amount of the pickup stylus to be ground varies depending upon the duration of actual service performed by the pickup stylus to reproduce video information recorded on a flexible foil-type disc record.

Stylus grinding device for video disc player

An automatic record feeding device particularly advantageous for use in association with a flexible foil-type video disc record used by a video disc player. The record feeding device includes a transfer roll having at least one escapement recess or notch formed in the outer peripheral surface thereof, and a back-up guide cooperative with the transfer roll to hold the disc record between it and the transfer roll during transfer of the disc record from one position to another.

Automatic flexible record feeding device

Growing community of inventors

Hirakata, Japan

Ichiro Takahara