Magneto-optical recording and reproducing device having light in

Details Magneto-optical recording and reproducing device having light in Magneto-optical recording and reproducing device having light in

1993-12-30

1995-09-19

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369288, 428694EC, 360114, G11B 1100

Patent

active

054522722

ABSTRACT:
A magneto-optical recording and reproducing device is provided with a magneto-optical disk for reproducing recorded information using light, a semiconductor laser, an objective lens for converging a light beam emitted from the semiconductor laser onto the magneto-optical disk and a light interrupting member for interrupting a portion of a light beam before it is incident on the objective lens. The magneto-optical disk is composed of a readout layer which is predominant in in-plane magnetization, and in which a transition occurs to be predominant in perpendicular magnetization as temperature thereof is raised and a recording layer for recording thereon information using a perpendicular magnetization. In this arrangement, since the light interrupting member is provided, a light spot can be made smaller, thereby improving a recording density. Moreover, even when temperature of the readout layer is raised due to a side robe generated by the light interrupting member, in-plane magnetization is maintained in the readout layer. Thus, interference by unwanted reproducing signals due to the side robe can be prevented, thereby improving a reproducing signal quality.

REFERENCES:
patent: 5278810 (1994-01-01), Takahashi et al.
"Superresolution Optical Head Technics", (O plus E, 1992-9, No. 154, pp. 81 to 83, issued on Sep. 5, 1992 by New Technical Communications Ltd.).
"Read Out Mechanism of Magnetically Induced Super Resolution", (Proceedings of Magneto-Optical Recording International Symposium '91, J. Magn. Soc. Jpn., vol. 115, Supplement No. S1 (1991), pp. 319-322).

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