Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1997-08-07
1999-04-13
Dinh, Tan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369 14, G11B 1100
Patent
active
058944605
ABSTRACT:
A rotary type pickup apparatus adopting a light modulation system, is capable of over-writing and suitable for miniaturization. In the optical pickup apparatus constituted by a stationary optical part and a rotary optical part which comprises an objective lens and a light beam guiding device, a recording magnet and an initialization auxiliary magnet are provided in the rotary optical part, the recording magnet being disposed close to the objective lens and the initialization auxiliary magnet being positioned over a rotation circumference where the objective lens rotates. Further provided are a recording magnet and an initialization auxiliary magnet which are disposed so as to pinch a magnetooptical recording medium together with the objective lens, the initialization auxiliary magnet being positioned behind the recording magnet in a sending direction of an optical card.
REFERENCES:
patent: 5243580 (1993-09-01), Maeda
patent: 5434844 (1995-07-01), Miyamoto et al.
patent: 5462811 (1995-10-01), Miyamoto et al.
patent: 5530685 (1996-06-01), Katayama et al.
patent: 5574703 (1996-11-01), Shimokawato et al.
Nakahara Masanori
Sano Fumihiko
Suzuki Hiroshi
Suzuki Shinji
Suzuki Yasumitsu
Dinh Tan
Pioneer Electronic Corporation
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