METHOD FOR MECHANICALLY RECORDING SOUND TO SOUND- RECORDING DISK, SOUND-RECORDING DISK TO BE USED FOR THE SOUND RECORDING, AND APPARATUS TO BE USED FOR RECORDING AND REPRODUCING SOUND IN COMMON

摘要

PROBLEM TO BE SOLVED: To dispense with a recording stylus pulling over mechanism provided at an apparatus to be used for recording and reproducing sound in common for producing a sound-recording groove continuously and spirally on a sound- recording disk.;SOLUTION: A spiral guide groove 11 for travelling the recording stylus 10 is previously produced on the surface of the sound-recording disk 4, and the sound-recording groove 12 is produced on the bottom surface of the guide groove.;COPYRIGHT: (C)2003,JPO