Pickup actuator

Details Pickup actuator Pickup actuator

1998-11-06

2000-07-18

Epps, Georgia

Optical: systems and elements

Lens

With support

369 4414, 359823, 359824, G02B 702

Patent

active

060915536

ABSTRACT:
A pickup actuator employed in an optical device for recording/reproducing information on/from an optical disc by using an optical device. The pickup actuator has a base member, a pair of yokes disposed at the base member and spaced from each other at a predetermined distance, a pair of magnets respectively attached to inner side surfaces of the yokes, a lens holder which is suspended by two pairs of wire springs so as to be moved toward directions of focusing and tracking in a space defined between the magnets, and on which an objective lens is mounted, a driving coil disposed at the lens holder, for driving the lens holder toward directions of focusing and tracking by electromagnetically interacting with the magnets, a pair of supporting plates disposed on the wire springs adjacent to opposite sides of one of the magnets, and a damping fluid applied between the pair of supporting plates and both opposite side portions of the one magnet, respectively for damping the vibration occurring at the lens holder when the lens holder is driven. Accordingly, when a vibration at the lens holder occurs, the vibration is directly damped by the damping fluid disposed between the one magnet and the wire springs which are supporting by the lens holder. Thus, an objective lens is allowed to reach a designated spot more rapidly. Accordingly, the pickup actuator can be employed in an optical device having the vibration of high intensity, such as in automobiles, etc.

REFERENCES:
patent: 4479051 (1984-10-01), Musha
patent: 4658390 (1987-04-01), Fujii et al.

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