Recording and reproducing apparatus with varying amounts of data

Details Recording and reproducing apparatus with varying amounts of data Recording and reproducing apparatus with varying amounts of data

1994-01-21

1996-06-11

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 32, G11B 1100

Patent

active

055263283

ABSTRACT:
A disk-shaped recording medium includes a transparent substrate, and an optical recording layer and a magnetic recording layer formed at one side of the transparent substrate. An optical head applies light to the optical recording layer from a light source via the transparent substrate, and focuses the light on the optical recording layer and reproduces information from the optical recording layer. A magnetic head records information on the magnetic recording layer or reproduces information from the magnetic recording layer. An optical head moving device serves to move the optical head by a movement amount so as to focus the light on an optical track on the optical recording layer which has specified address information. A magnetic head moving device serves to move the magnetic head to a specified magnetic track on the magnetic recording layer by referring to the movement amount of the optical head.

REFERENCES:
patent: 4750159 (1988-06-01), Yoda
patent: 5020041 (1991-05-01), Nakao et al.
patent: 5168482 (1992-12-01), Aratani et al.
patent: 5173886 (1992-12-01), Satoh et al.
patent: 5384759 (1995-01-01), Bass

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