Recording medium having a plurality of nonlinear transmission ch

Details Recording medium having a plurality of nonlinear transmission ch Recording medium having a plurality of nonlinear transmission ch

1993-02-23

1995-05-30

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 13, 369288, 369283, 3692752, 430502, 430270, G11B 700, G11B 1587

Patent

active

054208467

ABSTRACT:
An information recording medium includes an information recording layer on which at least information is to be recorded by irradiating light, and a light transmission restricting layer which has a plurality of nonlinear transmission characteristics or nonlinear reflection characteristics for the intensity of the light irradiated and which has an optical material for restricting the transmission or reflection of the light according to the respective characteristics when the light is irradiated onto the information recording layer. An information recording and reproducing unit uses the information recording medium and includes an information recording position setting unit for deciding a position at which information is to be recorded on the information recording medium by detecting a direction of an easy magnetization axis. With the above arrangement, the spot diameter of the light can be distinguished between the one when information is reproduced and the one when information is recorded on the information recording medium respectively, to thereby ensure an accurate positioning of the head on the tracks of the recording medium.

REFERENCES:
patent: 4316279 (1982-02-01), Russell et al.
patent: 5153873 (1992-10-01), Spruit et al.
patent: 5293567 (1994-03-01), Terao et al.
patent: 5315573 (1994-05-01), Nakao et al.
patent: 5315577 (1994-05-01), Kirino et al.
Technical Digest of Optical Data Storage, Feb. 1991, vol. 1499, pp. 209-215, Lecture No. TUB-3.
Technical Digest of Optical Data Storage, Feb. 1991, vol. 1499, pp. 216-225, lecture No. TUB-4.
N. Peyghambarian et al, "Physical Review Letters, vol. 51", Oct., 1983, pp. 1692-1695.

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