Magneto-optical recording method

Abstract

Abstract PURPOSE:To faithfully perform the reproducing by advancing the irradiating phase of laser light or prolonging the irradiating time or strengthening the laser light intensity of performing all of these operations even or performing selectively and singly individual operations when the irradiating hour of the laser light is delayed by timing of a modulation magnetic field at the time when a recording signal is changed. CONSTITUTION:A resonance type magnetic head driver 11 is composed of a condenser 17 as a main component, and is driven with a signal of a single frequency that is a channel clock to be inputted from an oscillator 16 or its multiple. The timing of the laser light irradiating from an optical head 8 as to the modulation magnetic field of an electromagnet 10, the irradiating time and the irradiating intensity are decided by a light modulation circuit 15, whereas, in this case, the circuit 15 is composed of a phase adjusting circuit 14, a pulse width adjusting circuit 13 and a laser power control circuit 12. Consequently, even when the irradiating hour is delayed in relation to an impressing magnetic field at the transition time of the recording signal (b), the reproducing can be made to follow a time change by quickening the irradiating timing or lengthening the irradiating time or promoting the light intensity even or using all of them or either of them.

Inventors

• 👤 Yasuyuki Miyaoka
• 👤 康之 宮岡

Bibliographic Details