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US 7,127,729 B2Granted
Magneto-optical head and magneto-optical disk drive
AssigneeFujitsu Limited
InventorsGoro Kawasaki, Tsuyoshi Matsumoto, Hiroyasu Yoshikawa, Nobuyuki Kanto, Tohru Fujimaki, Koichi Tezuka
Life of this patent
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Abstract
A magneto-optical head including a lens forming a light spot on a storage disk, a magnetic field generating coil arranged between the lens and the disk to surround the optical center of the lens, and an annular heat sink arranged around the coil. The distance between the outer circumference of the coil and the inner circumference of the heat sink is 70–100 μm.
Claims5
A magneto-optical head comprising:
- a focus lens for forming a light spot on a disk;
- a coil for magnetic field generation, the coil being arranged between the lens and the disk and surrounding an optical center of the lens;
- and
- an annular heat sink arranged around the coil;
- wherein a distance between an outer circumference of the coil and an inner circumference of the heat sink is 70–100 μm.
2 more elements
A magneto-optical disk drive comprising:
- a lens for forming a light spot on a disk of a surface-recording type;
- a coil for magnetic field generation, the coil being arranged between the lens and the disk and surrounding an optical center of the lens;
- and
- an annular heat sink arranged around the coil;
- wherein a distance between an outer circumference of the coil and an inner circumference of the heat sink is 70–100 μm, and wherein a distance between a surface of the disk and the coil is 3–50 μm.
2 more elements
Dependencies are inferred from the claim text.