Optical pickup actuator, optical pickup employing the optical pickup actuator and optical disc drive apparatus employing the optical pickup
AssigneeSamsung Electronics Co., Ltd.
InventorsMyung-sik Kwon, Jung-gug Pae
Life of this patent
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Abstract
An optical pickup actuator, an optical pickup employing the optical pickup actuator, and an optical disc drive apparatus employing the optical pickup. The optical pickup actuator includes a blade on which an objective lens for condensing light onto an optical disc is mounted, and on which coils are wound, and a base which includes a plurality of driving magnets, which interact with current flowing through the coils, to generate force that drives the blade in a predetermined direction and a shielding magnet, which is arranged opposite to and has the same polarity as at least one of the driving magnets, to block leakage magnetic flux from the driving magnets.
Claims31
An optical pickup actuator for an objective lens condensing light onto an optical disc, comprising:
- a blade holding the objective lens;
- coils installed to the blade;
- and
- a base comprising:
- a plurality of driving magnets interacting with a current flowing through the coils and generating a force that drives the blade in a predetermined direction, and
- a shielding magnet arranged opposite to, and having a same polarity facing at least one of the driving magnets, the shielding magnet blocking leakage of magnetic flux from the driving magnets.
An optical pickup for use with an optical disc, comprising:
- an optical pickup actuator for an objective lens condensing light onto the optical disc, wherein the optical pickup actuator comprises:
- a blade holding the objective lens,
- coils installed to the blade, and
- a base comprising:
- a plurality of driving magnets interacting with a current flowing through the coils and generating a force that drives the blade in a predetermined direction, and
- a shielding magnet arranged opposite to and having a same polarity facing at least one of the driving magnets, the shielding magnet blocking leakage of magnetic flux from the driving magnets;
- and
- an optical system, wherein the optical system comprises:
- the objective lens, and
- a light source radiating light through the objective lens.
An optical disc drive apparatus, comprising:
- an optical pickup, comprising:
- an optical pickup actuator for an objective lens condensing light onto an optical disc, wherein the optical pickup actuator comprises:
- a blade holding the objective lens,
- coils installed to the blade, and
- a base comprising:
- a plurality of driving magnets interacting with a current flowing through the coils and generating a force that drives the blade in a predetermined direction, and
- a shielding magnet arranged opposite to and having a same polarity facing at least one of the driving magnets and blocking leakage of magnetic flux from the driving magnets,
- a slider, mounted at one end of the optical pickup actuator forming an air bearing with the optical disc to provide lift;
- an optical disc rotating unit rotating the optical disc at a predetermined speed;
- a driving unit driving the optical pickup and the optical disc rotating unit;
- and
- a control unit controlling focusing and tracking servos of the optical pickup.
An optical pickup actuator for an objective lens condensing light onto an optical disc and a holder on a base, comprising:
- a blade holding the objective lens;
- a plurality of coils installed to the blade;
- and
- a plurality of magnets positioned on the base between the objective lens and the holder, wherein a first of the magnets is positioned closest to the objective lens having an opposite polarity facing a second of the magnets, and the second of the magnets having a same polarity faces a third of the magnets.
An optical pickup actuator for an objective lens condensing light onto an optical disc and a holder on a base, comprising:
- a blade holding the objective lens;
- a focusing coil having walls defining a cavity installed to the blade;
- first and second yokes mounted to the base;
- a first driving magnet positioned on the base and attachable to a side of the first yoke not facing the objective lens;
- a second driving magnet positioned in the cavity of the focusing coil and having one side facing the first driving magnet and the other side attachable to the second yoke;
- and
- a shielding magnet positioned on the base having one side facing the second yoke.
An optical pickup actuator for an objective lens condensing light onto an optical disc and a holder on a base, comprising:
- a blade holding the objective lens;
- a focusing coil having walls defining a cavity and at least one tracking coil installed to the blade;
- a plurality of driving magnets positioned on the base to interact with a current flowing through the coil generating a force driving the blade in a predetermined direction;
- and
- a shielding magnet positioned on the base blocking a leakage of magnetic flux from the driving magnets.
Dependencies are inferred from the claim text.