MASTER INFORMATION MEDIUM AND METHOD OF MASTER INFORMATION RECORDING.

摘要

A MASTER INFORMATIN CARRIER HAS A SHAPE PATTERN CORRESPONDING TO AN INFORMATION SIGNAL ARRAY TO BE RECORDED ON A MAGNETIC RECORDING MEDIUM, AND THE SHAPE PATTERN IS PROVIDED BY ARRAYING A FERROMAGNETIC THIN FILM (1) DEPOSITED ON A NONMAGNETIC SUBSTRATE SURFACE. THE FERROMAGNETIC THIN FILM (1) IS EITHER A SOFT MAGNETIC FILM OR SEMIHARD MAGNETIC FILM HAVING NOT MORE THAN 40KA/M COERCIVE FORCE IN TRACK LENGTH DIRECTION (2) OF THE INFROMATION SIGNALS, AND RESIDUAL MAGNETIZATION OF THE FERROMAGNETIC THIN FILM (1) IN THE TRACK LENGTH DIRECTION (2) OF THE INFORMATION SIGNALS IS GREATER THAN COERCIVE FORCE OF THE MAGENTIC RECORDING MEDIUM. AS A RESULT, A MASTER INFORMATION CARRIER WITH SUPERIOR MAGNETIC PERFORMANCE CAN BE OBTAINED.(FIGURE 3)