High-sensitivity pickup actuator for disc drive
AssigneeSamsung Electronics Co., Ltd.
InventorsByung-Youn Song, Hyung-Joo Kang, Dae-Jong Jang
Life of this patent
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Abstract
A pickup actuator of a disc drive includes a pair of magnets, each facing a respective side of a bobbin and having a middle region with a first polarity and side regions with a second polarity opposite of the first polarity. The pickup actuator includes a plurality of tracking coils disposed on the respective sides of the bobbin facing the magnets. Each tracking coil has two effective coil portions with one facing the middle region and the other facing one of the side regions of the magnet, for higher sensitivity. The magnets are disposed at two sides of a bobbin for lower cost and complexity of manufacture.
Claims24
A pickup actuator of a disc drive, the pickup actuator comprising:
- a pair of magnets, each facing a respective side of a bobbin and having a middle region with a first polarity and side regions with a second polarity opposite of the first polarity;
- and
- a plurality of tracking coils disposed on the respective sides of the bobbin facing the magnets, each tracking coil having two effective coil portions, one of the effective coil portions facing the middle region of a magnet, and the other of the effective coil portions facing one of the side regions of the magnet;
- wherein at least one of the side regions of a magnet has an extended branch fitting into the middle region of the magnet.
A pickup actuator of a disc drive, the pickup actuator comprising:
- a pair of magnets, each facing a respective side of a bobbin and having a middle region with a first polarity and side regions with a second polarity opposite of the first polarity;
- a plurality of tracking coils disposed on the respective sides of the bobbin facing the magnets, each tracking coil having two effective coil portions, one of the effective coil portions facing the middle region of a magnet, and the other of the effective coil portions facing one of the side regions of the magnet;
- a pair of tilt magnets facing remaining sides of the bobbin;
- and
- a pair of tilt coils each disposed on a respective one of the remaining sides of the bobbin and having effective coil portions in interaction with a respective one of the tilt magnets.
A disc drive comprising:
- a pickup that reproduces and/or records information on an information storage medium;
- a servo that controls movement of the pickup;
- and a pickup actuator that moves the pickup according to control by the servo, the pickup actuator including:
- a pair of magnets, each facing a respective side of a bobbin and having a middle region with a first polarity and side regions with a second polarity opposite of the first polarity;
- and
- a plurality of tracking coils disposed on the respective sides of the bobbin facing the magnets, each tracking coil having two effective coil portions, one of the effective coil portions facing the middle region of a magnet, and the other of the effective coil portions facing one of the side regions of the magnet;
- wherein at least one of the side regions of a magnet has an extended branch fitting into the middle region of the magnet.
Dependencies are inferred from the claim text.