Objective lens actuator having a high degree of design freedom

Details Objective lens actuator having a high degree of design freedom Objective lens actuator having a high degree of design freedom

1997-01-30

1999-03-09

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4422, 359814, 359824, G11B 709

Patent

active

058810331

ABSTRACT:
A structure has a focus coil wound or affixed on sides of a lens holder holding an objective lens and two or more permanent magnets spaced from each other and facing the focus coil with their magnetic poles directed in the same direction with respect to one side of the focus coil, wherein the density distribution of the magnetic flux passing through the side of the focus coil facing the permanent magnets has two or more maximum points. This allows for a large assembly error, or tolerance, and reduces inclination of the optical axis in an objective lens actuator used in the optical pickup of various kinds of optical disk devices.

REFERENCES:
patent: 4987565 (1991-01-01), Ikegame
patent: 5068844 (1991-11-01), Tanaka
patent: 5073882 (1991-12-01), Sasaki
patent: 5222056 (1993-06-01), Tanaka
patent: 5285434 (1994-02-01), Kim et al.
patent: 5428481 (1995-06-01), Ikegame et al.
patent: 5579295 (1996-11-01), Van Rosmalen
patent: 5663840 (1997-09-01), Matsui

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