Magneto-optical disk recording and reproducing apparatus capable

Details Magneto-optical disk recording and reproducing apparatus capable Magneto-optical disk recording and reproducing apparatus capable

1992-07-24

1994-01-04

Psitos, Aristotelis

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 13, 369 54, 369 48, 369110, G11B 390

Patent

active

052766659

ABSTRACT:
An optical magnetic disk recording/reproducing apparatus is capable of reproducing address data when recording data signals on a magneto-optical disk and when deleting data signals from a magneto-optical disk. The reproduction of address data is performed with a high degree of stability. The apparatus includes an optical head, photoelectric voltage converters, various adders, a differential device and several switches. A first switch switches between a first position in which an output of the first switch is connected to the output of the differential device and a second position in which the output of the first switch is connected to a reference voltage. A second switch includes a first position in which an output of the second switch is connected to the output of one of the adders and a second position in which an output of the second switch is connected to the output of the first switch. Several control signal generators control the switches. Thus, the first switch outputs a signal from a differential amplifier during data reproduction and outputs a reference voltage during data recording and erasing.

REFERENCES:
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patent: 4639907 (1987-01-01), Aoki et al.
patent: 4688203 (1987-08-01), Koishi et al.
patent: 4698695 (1987-10-01), Kosaka et al.
patent: 4833662 (1989-05-01), Yoda
patent: 5070494 (1991-12-01), Emoto et al.
patent: 5105415 (1992-04-01), Tayefeh

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