Magneto-optical head circuit for minimizing the overshoot reversing current
AssigneeTDK Corporation
InventorsGiichi Shibuya, Masanori Shibahara, Takashi Onodera
Life of this patent
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Abstract
An apparatus for generating a modulated magnetic field includes a magnetic head coil and a pair of additional inductive coils. The ratio of the average inductance of the additional inductive coils to the inductance of the head coil is from 2 to 8. The apparatus ensures a magneto-optical recording system of the magnetic field modulation mode having an increased switching speed and a minimized overshoot of recording current.
Claims9
An apparatus for generating a modulated magnetic field for magneto-optical recording, comprising:
- a magnetic head coil, a first additional inductive coil, and a second additional inductive coil, each coil having one end and another end,
- one end of said first additional inductive coil being connected to one end of the head coil and to the ground through a first switching element, the other end of said first additional inductive coil being connected to a power supply,
- one end of said second additional inductive coil being connected to the other end of the head coil and to ground through a second switching element, the other end of said additional inductive coil being connected to the power supply,
- control means for repetitively switching the first and second switching elements between respective ON/OFF states, and
- said first and second additional inductive coils having inductances, an average of which is L.sub.R, and said head coil having an inductance L.sub.H, wherein 2.ltoreq.(L.sub.R /L.sub.H).ltoreq.8.
A method for magneto-optical recording in a magneto-optical recording medium, comprising the steps of:
- rotating the medium relative to a magnetic head,
- directing laser light to the medium from an optical head,
- generating a modulated magnetic field by the steps of:
- supplying power through respective first and second inductive coils, through a head coil and to ground through respective first and second switches, and
- alternately controlling the respective ON/OFF states of said first and second switching elements,
- the first and second inductive coils having inductances, an average of which is L.sub.R, and said head coil having an inductance wherein 2.ltoreq.(L.sub.R /L.sub.H).ltoreq.8,
- applying said modulated magnetic field across the magneto-optical medium from the magnetic head.
Dependencies are inferred from the claim text.