Optical pickup actuator for both a compact disc and a digital vi

Details Optical pickup actuator for both a compact disc and a digital vi Optical pickup actuator for both a compact disc and a digital vi

1998-11-25

2000-07-04

Ben, Loha

Optical: systems and elements

Lens

With support

359813, 369 4422, G02B 702

Patent

active

060847263

ABSTRACT:
A yoke includes a shaft upwardly protruding from the bottom and a plurality of magnets mounted at a certain interval along the inner periphery surface of the yoke. A lens holder is movably connected with the yoke through the shaft, and has a plurality of winding coils at positions opposite to the plurality of magnets respectively. At least two laser openings are formed in the lens holder in parallel with a laser beam axis direction. Lens containing portions are formed on upper portions of the laser openings in order for an objective lens for the compact disc(CD) and an objective lens for the digital video disc(DVD) to be accommodated. Each of the plurality of magnets is formed in a two-body type. The plurality of magnets are constituted with a plurality of first magnets polarized in parallel with the laser beam axis direction and a plurality of second magnets polarized perpendicular with the laser beam axis direction, the first magnets and the second magnets are alternately mounted.

REFERENCES:
patent: 4687296 (1987-08-01), Terayama et al.
patent: 4861138 (1989-08-01), Suzuki
patent: 4998802 (1991-03-01), Kasuga et al.
patent: 5132850 (1992-07-01), Hagiwara
patent: 5506732 (1996-04-01), Mori
patent: 5659525 (1997-08-01), Miyamae et al.
patent: 5687154 (1997-11-01), Tsuchiya et al.
patent: 5815328 (1998-09-01), Makita
patent: 5825561 (1998-10-01), Ohguri

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