Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1991-03-28
1993-07-06
Anderson, Bruce C.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
360114, G11B 700, G11B 5127
Patent
active
052260305
ABSTRACT:
A magneto-optical recording and reproducing device in which recording is carried out by applying a modulated laser beam and a bias magnetic field to a recording point of a magneto-optical recording disc and erasing is carried out by reversing a direction of the bias magnetic field and continuously applying a laser beam to the recording point. The device includes an electromagnet (2) for applying the bias magnetic field, a carriage (3) on which a laser for irradiating the laser beam is mounted, an actuator including magnets (4) and coils (5) for controlling the focal point of the laser beam, a linear motor including magnets (7), yokes (8) and coils (6) for linearly moving the carriage (3). In one embodiment, the polarities of the magnets (4, 7) of the actuator and linear motor, respectively, are arranged such that a direction of the magnetic field of the actuator is opposite to that of the linear motor so as to minimize the resulting magnetic flux. In another embodiment, the magnets (7) of the linear motor are arranged such that the polarities of the magnets are opposite one another to form a closed magnetic path.
REFERENCES:
patent: 4672594 (1987-06-01), Kato et al.
patent: 4787002 (1988-11-01), Isozaki
patent: 4939711 (1990-07-01), Yoda
patent: 5093816 (1992-03-01), Taniguchi et al.
Anderson Bruce C.
Pioneer Electronic Corporation
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