Invention Grant
US07791985B2 Objective lens driving apparatus 失效
物镜驱动装置

Objective lens driving apparatus
Abstract:
An objective lens driving apparatus comprising: an actuator movable unit that is configured such that a driving coil is mounted on a lens holder with an objective lens, and is supported on an actuator frame displaceably and elastically; a magnetic circuit that includes a magnet fixed to the actuator frame to form an effective magnetic field for the driving coil; and a rolling canceling coil that is so mounted on the lens holder as to act on the effective magnetic field formed by the magnetic circuit so effectively that a driving force is generated in a tilt direction that cancels rolling generated when a drive signal is supplied to a tracking coil to drive the actuator movable unit in a tracking direction.
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