Information recording disc demagnetization apparatus

Details Information recording disc demagnetization apparatus Information recording disc demagnetization apparatus

1998-12-11

2000-05-02

Dinh, Tan

Dynamic information storage or retrieval

Simultaneous diverse types of storage or retrieval

361267, G11B 1300

Patent

active

06058078&

ABSTRACT:
An information recording disc demagnetization apparatus according to the present invention demagnetizes information recording discs whose information is read by irradiating a laser beam, such as a music CD (audio compact disc), a photographic CD, DVD, MD, etc. The demagnetization process performed by the apparatus of the present invention successfully recovers tone quality, image quality, and the like, of the information recording disc, all of which are deteriorated by magnetism attained by the disc during reproduction of the disc.
The information recording disc demagnetization apparatus has a disc-shaped air-core coil for creating an alternating magnetic field having a decremental intensity, and a means for holding the information recording disc in a stationary state within the alternating magnetic field.

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