Two-sided optical disks having recording layers disposed close t

Details Two-sided optical disks having recording layers disposed close t Two-sided optical disks having recording layers disposed close t

1992-12-31

1995-02-21

Pascal, Robert J.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

3692752, 365122, G11B 1732

Patent

active

053922620

ABSTRACT:
A magnetooptical disk has two axially space-apart translucent recording layers. Each translucent recording layer is axially closer to an outer surface of the disk than to the other recording layer. This geometry enables closely axially disposing a magnetic field biasing means to each of the recording layers from opposite axial sides of the disk, respectively. Laser beams are axially introduced into the disk to pass through one of the translucent recording layers in a defocussed state to reach a second recording layer in a focussed state. In this manner, recording in the second layer is effected by a modulated magnetic bias field using a constant intensity laser beam. Two sets of laser beams and magnetic biasing means are provided for recording on both data in both of the recording layers.

REFERENCES:
patent: 4737947 (1988-04-01), Osato et al.
patent: 4740947 (1988-04-01), Ohta et al.
patent: 4807204 (1989-02-01), Mizutani et al.
patent: 5202880 (1993-04-01), Lee et al.

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