MASTER INFORMATION CARRIER AND METHOD FOR MANUFACTURING MAGNETIC DISC USING THE SAME.

摘要

A MASTER INFORMATION CARRIER (1) CAPABLE OF MANUFACTURING A MAGNETIC RECORDING MEDIUM IN WHICH A PREFORMAT RECORDING OF INFORMATION SIGNALS CAUSING NO REPRODUCTION SIGNAL DETECTION ERRORS ARISING FROM A PULSE SHIFT OF A REPRODUCTION WAVEFORM (5) IS PERFORMED. A MASTER INFORMATION CARRIER (1) HAS AN ARRAY OF FERROMAGNETIC THIN FILMS (3) ARRANGED ACCORDING TO THE PATTERN OF INFORMATION SIGNALS AND IS USED FOR FORMING MAGNETIZATION (4) OF A PATTERN CORRESPONDING TO THE ARRAY PATTERN OF THE FERROMAGNETIC THIN FILM (3) IN A MAGNETIC RECORDING MEDIUM BY APPLYING A MAGNETIC FIELD WHILE OPPOSING THE MASTER INFORMATION CARRIER (1) AGAINST A MAGNETIC RECORDING MEDIUM (2). EACH OF THE FERROMAGNETIC THIN FILMS (3) IS FORMED SUCH THAT EACH PATTERN LENGTH A BECOMES EQUAL TO A LENGTH INCLUDING A CORRECTION AMOUNT A IN ADDITION TO A LENGTH A BETWEEN MAGNETIC TRANSITION AREAS (6) OF THE MAGNETIZATION (4) TO BE FORMED IN THE MAGNETIC RECORDING MEDIUM (2).(FIG 1)