Optical pickup actuator with magnetic levitation structure

Details Optical pickup actuator with magnetic levitation structure Optical pickup actuator with magnetic levitation structure

1998-03-03

2000-02-29

Cao, Allen T.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specified detail of transducer assembly support structure

G11B 1700

Patent

active

060318120

ABSTRACT:
An optical pickup actuator with a featured magnetic-levitation structure is provided. The magnetic-levitation structure is devised in particular to cause the actuator to be restored to and then remain stably at a neutral position after a focusing and tracking operation is completed. The actuator includes a lens holder for holding an objective lens; a shaft axially coupled to the lens holder; a plurality of magnets for producing magnetic fields; and coil member that can interacts with the magnetic fields from the magnets perform the focusing and tracking actions. In addition, the actuator includes a magnetic-levitation structure including at least a pair of magnetically-attractable bars, such as iron bars or steel bars, which are disposed in relation to the magnets in such a manner that the magnetic force acting on the first magnetically-attractable bar is equal in magnitude and opposite in direction to the magnetic force acting on the second magnetically-attractable bar, thereby allowing the actuator to be restored to its neutral position after a focusing and tracking operation is completed.

REFERENCES:
patent: 4792935 (1988-12-01), Kime et al.
patent: 4998802 (1991-03-01), Kasuga et al.
patent: 5659525 (1997-08-01), Miyamae et al.
patent: 5844881 (1998-12-01), Kasuga et al.

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