PURPOSE:To extend the service life of a metallic mold and to obtain a disk substrate having high accuracy by forming a hard layer consisting of a material having the higher hardness than the hardness of a material to constitute a stamper mounting surface and excellent wear resistance to the stamper mounting surface. CONSTITUTION:The hard layer 9 is formed of the material having the hardness higher...

Equipment for labeling audio signals with identification information has an encoder which inserts the binary information into two very narrow notches of centre frequencies 2883 and 3417 Hz, between semi-tones in the tonic scale to minimise music breakthrough into the decoding circuits, and to ensure that no fundamental frequencies in the tonic scale will be excluded in the reproduction. The notche...

Picture field ordinal numbers recorded near the synchronizing signals of video tape recordings are currently stored in a register as the tape is played back while a modulo 4 up/down counter is incremented or decremented according to the direction of tape transport. A comparison operation checks whether the picture field numbering is in step with the counter for detection of discontinuities or erro...

This invention relates to a compact protector which is used to prevent the over-heat of a compact motor used in heat generating appliances such as a hair dryer or electric washing machine. The protector incorporates therein an excess current prevention portion (3) utilizing a bimetal and an excessive temperature rise prevention portion (4) utilizing a temperature fuse. The protector opens an elect...

A fluorescent lamp operating circuit includes a high frequency electronic ballast circuit for providing a controlled output to a fluorescent lamp load. A control signal is detected from the power line carrier which includes binary data indicative of the illumination level desired. The control signal comprises a multi-bit binary signal which is detected by the control circuit and used to control th...