Objective-lens driving apparatus and optical disk apparatus

Details Objective-lens driving apparatus and optical disk apparatus Objective-lens driving apparatus and optical disk apparatus

2007-12-25

2007-12-25

Cao, Allen (Department: 2627)

Dynamic optical information storage or retrieval

Dynamic mechanism optical subsystem

Transducer carriage or actuator

Reexamination Certificate

active

11704962

ABSTRACT:
An optical disk apparatus includes an objective-lens for converging light on a recording surface of an optical disk, and an objective-lens driving device for driving the objective-lens in a focusing direction and a tracking direction. The objective-lens driving device includes a focusing coil having four edges to enclose the objective-lens, and two pairs of permanent magnets. The two pairs of permanent magnets are arranged so that polarities thereof become identical to sides of focusing coil, wherein one pair of the permanent magnets is arranged opposed to an edge of the focusing coil, and an other pair of the permanent magnets is arranged opposed to an edge opposite to the edge of the focusing coil. An interval between two magnets constituting the one pair of permanent magnets is narrower than an interval between two magnets constituting the other pair of permanent magnets.

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