Record face identifying device for magneto-optic record medium

Details Record face identifying device for magneto-optic record medium Record face identifying device for magneto-optic record medium

1988-06-03

1991-02-12

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

360114, 360 745, 369 13, G11B 700, G11B 1114

Patent

active

049930125

ABSTRACT:
A magneto-optic record signal processing system uses a linearly polarized light beam to be projected onto a magneto-optic medium and a recorded signal is reproduced by analyzing the polarized conditions of a reflected light beam from the medium. This processing system also includes a recording face identifying device for determining the recording face of the magneto-optic record medium. To determine the recording face, an initialized area projecting device projects a light beam onto an initialized area of a magneto-optic record medium. A transducing circuit then converts a slant in a polarization plane of a reflected light beam from the initialized area into a light intensity. A photo-detector detects the light intensity outputted from the transducing means and a comparator compares the output from the photo-detector with a reference level to determine the magnetization of the recording face.

REFERENCES:
patent: 4497049 (1985-01-01), d'Alayer de Costemore
Patent Abstracts of Japan; vol. 8; No. 245 (P-312) (1682) Nov. 10, 1984, & JP-A-59 119504 (Fujitsu K.K.) Jul. 10, 1984, the whole document.

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