Disk drive and magnetic circuit fixing method for the same
A disk-drive magnetic circuit fixing structure and fixing method for fixing a magnetic circuit to a base by means of a plurality of screws, wherein provisions are made to substantially prevent a microscopic sliding movement involving impulsive vibration from occurring at a fastening portion between the magnetic circuit and the base. More specifically, in a disk drive including a disk enclosure having a base and a cover, a magnetic head contained within the disk enclosure, and a driving coil motor for driving the magnetic head by working in combination with an actuator on which the magnetic head is mounted and a magnetic circuit disposed in the vicinity of the actuator, the magnetic circuit is fixed to the base with a single or a plurality of screws by applying in advance a lubricant forming a lubricating layer on a face where each screw contacts the magnetic circuit or the base.
1. A disk drive comprising:
a disk enclosure having a base and a cover;
a magnetic head, contained within said disk enclosure, configured to read and write information on an information storage disk;
a driving coil motor configured to move said magnetic head to a designated position on said disk by working in combination with an actuator on which said magnetic head is mounted and a magnetic circuit disposed in the vicinity of said actuator; and
a magnetic circuit fixing structure comprising at least one screw fastening a fixing portion of the magnetic circuit to the base and a resin layer with an adhesive layer formed thereon inserted between said magnetic circuit and said base,
wherein the adhesive layer is formed on the resin layer except a portion thereof that overlaps the fixing portion of the magnetic circuit and is passed through the screw.
2. A disk drive as claimed in claim 1 , wherein said magnetic circuit and said base are respectively fabricated from dissimilar metals.
3. A disk drive as claimed in claim 1 , wherein said magnetic circuit comprises an upper magnet and upper magnetic yoke disposed above said actuator, a lower magnet and lower magnetic yoke disposed under said actuator, and a magnetic circuit connecting portion magnetically connecting between said upper magnetic yoke and said lower magnetic yoke.
4. A disk drive as claimed in claim 1 , wherein said magnetic circuit fixing structure fastens at least one of lower and upper magnetic yokes of said magnetic circuit to said base via said cover with said screw.
5. For use in a disk drive comprising a disk enclosure having a base and a cover, a magnetic head, contained within said disk enclosure, configured to read and write information on an information storage disk, and a driving coil motor configured to move said magnetic head to a designated position on said disk by working in combination with an actuator on which said magnetic head is mounted and a magnetic circuit disposed in the vicinity of said actuator, a disk-drive magnetic circuit fixing method for fixing said magnetic circuit to said base by means of at least one screw, comprising:
inserting a resin layer with an adhesive layer formed thereon between said magnetic circuit and said base, the adhesive layer being formed on the resin layer except a portion thereof that overlaps a fixing portion of the magnetic circuit; and
fixing said magnetic circuit to said base by said screw.