Focusing lens system for an optical head assembly

Details Focusing lens system for an optical head assembly Focusing lens system for an optical head assembly

1996-12-24

1998-10-20

Epps, Georgia Y.

Optical: systems and elements

Lens

With support

G02B 702

Patent

active

058255613

ABSTRACT:
A focusing lens system for an optical head has a plurality of objective lenses and a lens actuator including a cylindrical housing and a lens holder rotatably and slidably mounted by a shaft within the cylindrical housing. A switching mechanism selects one of the first and second lens for effecting tracking of the optical head depending on the type of an optical disk. The switching mechanism includes a pair of magnets mounted on the lens holder and a pair of associated coils secured on the inner wall of the cylindrical housing. The lens holder is further driven along the shaft for focusing of the selected lens.

REFERENCES:
patent: 4946265 (1990-08-01), Shimizu et al.
patent: 5216531 (1993-06-01), Boardman et al.
patent: 5440419 (1995-08-01), Boardman et al.
patent: 5687154 (1997-11-01), Tsuchiya et al.
Yamamoto, Kenji; Osato, Kiyoshi; Ichimura, Isoa; Maeda, Fumisada; and Watanabe, Toshio, "0.8 Numerical Aperture Two-Element Objective Lens for the Optical Disk", http://wwwsoc.nacsis.ac.jp/jjap/36-1B-1/19631.tex.abst/index.html Jan. 1997.

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