Actuator for optical pickup apparatus

Details Actuator for optical pickup apparatus Actuator for optical pickup apparatus

1996-12-27

1999-09-07

Ben, Loha

Optical: systems and elements

Lens

With support

359824, G02B 702

Patent

active

059495901

ABSTRACT:
An improved actuator for an optical pickup apparatus which is capable of increasing the efficiency of a focusing coil and tracking coil by arranging the focusing coil and tracking coil in the same plane and disposing more than at least one permanent magnet in order for a plurality of poles to be alternately generated thereby, for thus improving an operation efficiency of an optical pickup apparatus for a high density optical disc which has been made to be operated at a high speed. The actuator includes a bobbin including an objective lens, back yokes disposed at both sides of the bobbin, a plurality of permanent magnets arranged in one side of each back yoke in order for the poles thereof to be differently and alternately formed, and a plurality of tracking coils and focusing coils arranged in a portion of the permanent magnets of the bobbin.

REFERENCES:
patent: 4861138 (1989-08-01), Suzuki
patent: 5506732 (1996-04-01), Mori
patent: 5659525 (1997-08-01), Miyamae et al.
patent: 5663840 (1997-09-01), Matsui

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