Actuator used with an optical pickup having plate coils and magnets
AssigneeSamsung Electronics Co., Ltd.
InventorsJin-won Lee, Kwang Kim, Young-min Cheong
Life of this patent
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Abstract
An actuator used with an optical pickup to drive a blade, on which an objective lens is mounted, in focusing and tracking directions, includes a pair of magnets installed on a base, and a plate coil installed in the blade to be placed between the magnets. Each magnet has a shape in which N and S poles of the magnet are alternately magnetized in four regions asymmetrically split vertically and horizontally. In this structure, the actuator used with an optical pickup can be less affected by sensitivity variations when the blade is displaced, and the size of the electromagnetic driving unit can be reduced by reducing the number of magnetized gaps formed in the magnet.
Claims7
An actuator used with an optical pickup to drive a lens mount, mounted on a base, in focusing tracking directions, the actuator comprising:
- a pair of magnets installed on the base;
- and
- a plate coil installed on the lens mount and placed between the magnets;
- wherein each magnet has a shape in which N and S poles of the magnet are alternately magnetized in four regions asymmetrically split vertically and horizontally.
An actuator used with an optical pickup to drive a lens mount, mounted on a base, in focusing and tracking directions, the actuator comprising:
- a pair of magnets installed on the base, each magnet having a shape in which N and S poles of each magnet are alternately magnetized in plural asymmetrically split regions;
- and
- a plate coil installed on the lens mount and placed between the magnets.
Dependencies are inferred from the claim text.