Magneto-optical recording utilizing signal phase adjustment

Details Magneto-optical recording utilizing signal phase adjustment Magneto-optical recording utilizing signal phase adjustment

1993-07-01

1995-09-12

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369124, 369 47, 369 54, G11B 1112

Patent

active

054503817

ABSTRACT:
Magneto-optically recorded data can be recorded at high density, such that the data can be overwritten by a simple arrangement and with a small energy. Also, data of high recording density can be accurately recorded and reproduced by a simple arrangement. An alternating field having the same frequency as that of a recording fundamental clock generated by a PLL circuit (8) is generated by a coil (5) that is part of a tank circuit (7) and then applied to a magneto-optical disc (1). A phase of the recording fundamental clock is modulated by a phase modulating circuit (12) in association with recording data and a pulse synchronized with leading edge and trailing edge of such clock is generated by a pulse generating circuit (13). An optical pickup device (4) irradiates the magneto-optical disc (1) with a laser light in synchronism with the pulse. Therefore, a high density recording method in which the edge position of pit is shifted stepwise in association with data to be recorded can be applied to a magneto-optical recording medium.

REFERENCES:
patent: 5060208 (1991-10-01), Nagai et al.

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