Nippon Columbia Kabushiki Kaisha

Yoshikazu Kobayashi

Tsutomu Hara

Yoshiji Suzuki

Masachika Harada

Toshihiko Takagi

A recording disc on which a frequency modulated (FM) signal is recorded as pits or dots along a track formed as a concentric or spiral shape in such a manner that the pits or dots are arranged on a radial line during at least a predetermined interval.

Recording disc with sync information disposed in radial alignment

A frequency modulated (FM) signal is recorded as pits or dots along a track formed as a concentric or spiral shape on a recording medium such as a recording disc. The pits or dots are arranged on a radial line during at least a predetermined interval.

Recording apparatus

An optical record disc is provided having a guide signal pit previously formed on a base plate for reading out a tracking information by a laser beam. A reflection film is coated on the base plate including the guide signal pit portion, and the record blank portion. A record layer of a removing type is formed over the reflection film. The record layer has a uniform thickness over the record layer and a uniform thickness, of substantially smaller dimension over the guide signal pit portion.

Optical record disc

A color video disc is disclosed in which at least two field synchronizing signals and color video signals are recorded on a track in a line sequence manner. In this case, the first color video signal component in each field is selected to be the same color. An apparatus for making the above color video disc is also described with which the synchronizing signals and color video signals derived from signal producing circuit are recorded on the color video disc with a cutter device and in which a 1/3 counter is provided. The 1/3 counter serves to supply therethrough an output signal from a synchronizing signal generator to a line sequence signal generator and the output signal is applied to the signal producing circuit. A reproducing apparatus for the color video disc is described in which the signal reproduced from the color video disc is applied to a signal processing system. This signal processing system does not include a pilot signal extracting circuit which is required in the prior art.

Growing community of inventors

Kawasaki, Japan

Yoshikazu Kobayashi