Magnetic field generator and photomagnetic information storage apparatus
AssigneeFujitsu Limited
InventorHiroyasu Yoshikawa
Life of this patent
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Abstract
An object is to provide a magnetic field generator permitting fabrication by a simple manufacturing technique, such as plating, and capable of suppressing the generation of an eddy current as well as a photomagnetic information storage apparatus capable of high speed data recording and reproduction. It has an annular coil 311 surrounding an inner hole, and a plurality of magnetic rods 312 radially disposed centering on the inner hole of the coil 311 so as to overlap the coil 311, insulated from the coil 311 and consisting of a magnetic material, the maximum width of each rod being not more than twice the minimum width.
Claims13
A magnetic field generator comprising:
- an annular coil surrounding an inner hole, and
- a plurality of magnetic rods which are insulated from the coil, consist of a magnetic material, are arranged radially around the inner hole of the coil so as to overlap the coil and have a ratio of not greater than 2/1 between the maximum width and the minimum width.
A photomagnetic information storage apparatus which accesses an information recording medium for information by using light and magnetic fields, the photomagnetic information storage apparatus comprising:
- a light source which emits light;
- a condensing lens that condenses the light emitted from the light source on the information recording medium;
- an annular coil surrounding an inner hole, disposed on the information recording medium side of the condensing lens and causing a magnetic field to be generated on the information recording medium in a position where the condensing lens condenses light;
- and
- a plurality of magnetic rods radially arranged centering on the inner hole of the coil between the coil and the condensing lens, insulated from the coil, and made of a magnetic material, the maximum width of each rod being not more than twice the minimum width.
Dependencies are inferred from the claim text.