Magnetic field generator and magneto-optical storage device using the same
AssigneeFujitsu Limited
InventorHideki Yamaguchi
Life of this patent
Estimating the term…
Abstract
A magnetic field generator includes a top yoke having an opening, a back yoke fixed to the top yoke, a center yoke fixed to the back yoke in such a manner as to face to the opening of the top yoke, and a coil wound around the center yoke. The opening has a straight-line shaped central portion with its gap kept constant, and both end portions with their gaps becoming larger as going outwardly from the vicinities of both end portions of the center yoke.
Claims11
A magnetic field generator comprising:
- a coil;
- a center yoke disposed in a central portion of said coil;
- a top yoke having an opening from which an upper portion of said center yoke is exposed, said top yoke being disposed on an upper surface side of said coil;
- and
- a back yoke disposed on a back surface side of said coil;
- wherein said opening has a straight-line shaped central portion with its gap kept constant, and enlarged portions with their gaps becoming larger as going outwardly from the vicinities of both end portions of said center yoke.
A magneto-optical storage device for storing information on a magneto-optical storage medium, comprising:
- a holder for accommodating said magneto-optical storage medium having been inserted in said magneto-optical storage device;
- an optical head for irradiating said magneto-optical storage medium with a light beam;
- and
- a magnetic field generator disposed on said holder;
- said magnetic field generator comprising:
- a coil;
- a center yoke disposed in a central portion of said coil;
- a top yoke having an opening from which an upper portion of said center yoke is exposed, said top yoke being disposed on an upper surface side of said coil;
- and
- a back yoke disposed on a back surface side of said coil;
- wherein said opening has a straight-line shaped central portion with its gap kept constant, and enlarged portions with their gaps becoming larger as going outwardly from the vicinities of both end portions of said center yoke.
A magneto-optical storage device for storing information on a magneto-optical storage medium, comprising:
- a holder for accommodating said magneto-optical storage medium having been inserted in said magneto-optical storage device;
- an optical head for irradiating said magneto-optical storage medium with a light beam;
- and
- a magnetic field generator disposed on said holder;
- said magnetic field generator comprising:
- a coil;
- a center yoke disposed in a central portion of said coil;
- a top yoke having an opening from which an upper portion of said center yoke is exposed, said top yoke being disposed on an upper surface side of said coil;
- a back yoke disposed on a back surface side of said coil;
- and
- adjustably fixing means for fixing said back yoke to said top yoke after adjustably setting a position of said back yoke to said top yoke.
Dependencies are inferred from the claim text.