Lens actuator for dual lens optical disk apparatus having lens m

Details Lens actuator for dual lens optical disk apparatus having lens m Lens actuator for dual lens optical disk apparatus having lens m

1997-02-19

1999-01-26

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4427, 369 54, 369 58, G11B 7095

Patent

active

058645241

ABSTRACT:
A lens actuator for use in an optical data reader, comprising: a base on which a plurality of N (N=natural number not less than two) objective lenses corresponding to N optical data recording media having substrates of different thicknesses, respectively are mounted; a supporting shaft which is provided on the base such that the base is movable vertically and rotatable within predetermined ranges, respectively relative to the supporting shaft; a pair of driving coils for performing changeover among the objective lenses and tracking follow-up of the data recording media; and N pairs of magnets which form a magnetic circuit together with the driving coils such that the base is rotated by the driving coils and the magnets.

REFERENCES:
patent: 5729510 (1998-03-01), Kasahara et al.

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