BIAS MAGNETIC FIELD IMPRESSION DEVICE

• Main Authors: TERASAWA TAKESHI, NAKAJIMA OSAMU
• Format: Patent
• Language: English
• Published: 23.01.1989
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

PURPOSE:To shorten the reversal time of polarity, by providing plural excitation coils which are arranged adjacently to a rotatable permanent magnet having four magnetic poles and generate torque in the permanent magnet. CONSTITUTION:A laser beam from a laser beam source 11 is diaphragmed to a micro...