Head supporting assembly, head driving assembly, and disk drive apparatus
View Patent ↗A head supporting assembly has high flexibility, while applying a necessary and sufficient pressing force to a head, is excellent in shock resistance, and provides a stabilized pressing force not affected by manufacturing variations, and a head driving assembly and a disk drive apparatus use such head supporting assembly. The head supporting assembly is configured to have a base arm provided with a rotation-supporting portion for supporting a head supporting member for rotation in a direction toward and away from a disk surface and a resilient member having one end thereof connected to an end of a supporting arm and the other end connected to the base arm. The rotation-supporting portion of the base arm is provided at such a position that a head mount is allowed to be displaced relative thereto by pressing of the rotation-supporting portion in the pressing direction.
1. A head supporting assembly comprising:
a head for performing at least one of recording and reproduction on a disk provided in a disk plane;
a head supporting member made up of said head, a head mount with said head mounted thereon, and a supporting arm with said head mount attached to a first end thereof;
a base arm having a rotation-supporting portion for supporting said head supporting member for rotation in a direction toward and away from the disk plane; and
a resilient member having a first end thereof connected with a second end of said supporting arm at a connected portion, and a second end thereof fixed to said base arm at a fixed portion for urging said head supporting assembly toward said disk;
wherein said rotation-supporting portion comprises a plurality of pivots provided at a first end of said base arm;
wherein said supporting arm and said base arm are separate members;
wherein said second end of said resilient member is fixed to said first end of said base arm;
wherein said rotation-supporting portion of said base arm is provided at such a position that said head mount is allowed to be displaced relative thereto by pressing of said rotation-supporting portion in a pressing direction;
wherein said resilient member is a plate spring; and
wherein said resilient member has length L 1 from said connected portion to said fixed portion, the length L 1 satisfying a relationship L 2 /L 1 ≧10.5, where L 2 is a length from said rotation-supporting portion to said connected portion.
2. The head supporting assembly according to claim 1 , wherein
said supporting arm undergoes substantially parallel displacement by pressing of said rotation-supporting portion of said base arm.
3. The head supporting assembly according to claim 2 , wherein
a center of gravity of said head supporting member is positioned on a rotation axis of said rotation-supporting portion provided on said base arm.
4. The head supporting assembly according to claim 1 , wherein
said resilient member is a plate spring member disposed between said base arm and said supporting arm so as to be bilaterally symmetric.
5. The head supporting assembly according to claim 4 , wherein
a center of gravity of said head supporting member is positioned on a rotation axis of said rotation-supporting portion provided on said base arm.
6. The head supporting assembly according to claim 1 , wherein
a center of gravity of said head supporting member is positioned on a rotation axis of said rotation-supporting portion provided on said base arm.
7. A head driving assembly comprising:
a head supporting assembly;
a bearing portion for supporting said head supporting assembly for rotation in a direction parallel to the disk plane; and
driving means for rotating said head supporting assembly in the direction parallel to the disk plane;
wherein said head supporting assembly is the head supporting assembly set forth in claim 1 .
8. The head driving assembly according to claim 7 , wherein
said base arm is arranged at a predetermined angle with said disk surface.
9. A disk drive apparatus comprising:
a disk;
rotative driving means for driving said disk; and
head driving assembly for performing writing information into a predetermined track position of said disk or reading information out of a predetermined track position, wherein
said head driving assembly is the head driving assembly set forth in claim 7 .
10. The head supporting assembly according to claim 1 , wherein
said pivot portions are provided on a surface of said base arm facing said supporting arm; and
said pivot portions bear against said supporting arm.
11. The head supporting assembly according to claim 1 , wherein
said fixed portion is located between said connected portion and said head.
12. A head supporting assembly comprising:
a head for performing at least one of recording and reproduction on a disk provided in a disk plane;
a head supporting member made up of said head, a head mount with said head mounted thereon, and a supporting arm with said head mount attached to a first end thereof;
a base arm having a rotation-supporting portion for supporting said head supporting member for rotation in a direction toward and away from the disk plane; and
a resilient member having a first end thereof connected with a second end of said supporting arm at a connected portion, and a second end thereof fixed to said base arm at a fixed portion for urging said head supporting assembly toward said disk;
wherein said supporting arm is interconnected with said base arm only by said resilient member; and
wherein said rotation-supporting portion of said base arm is provided at such a position that said head mount is allowed to be displaced relative thereto by pressing of said rotation-supporting portion in a pressing direction
wherein said resilient member has length L 1 from said connected portion to said fixed portion, the length L 1 satisfying a relationship L 2 /L 1 >0.5, where L 2 is a length from said rotation-supporting portion to said connected portion.
13. The head supporting assembly according to claim 12 , wherein
said rotation-supporting portion comprises at least one pivot portion provided on a surface of said base arm facing said supporting arm; and
said at least one pivot portion bears against said supporting arm to serve as a fulcrum.
14. The head supporting assembly according to claim 12 , wherein
said fixed portion is located between said connected portion and said head.
15. The head supporting assembly according to claim 12 , wherein
said supporting arm undergoes substantially parallel displacement by pressing of said rotation-supporting portion of said base arm.
16. The head supporting assembly according to claim 12 , wherein said resilient member is a plate spring.
17. The head supporting assembly according to claim 12 , wherein
a center of gravity of said head supporting member is positioned on a rotation axis of said rotation-supporting portion provided on said base arm.
18. A head driving assembly comprising:
a head supporting assembly;
a bearing portion for supporting said head supporting assembly for rotation in a direction parallel to the disk plane; and
driving means for rotating said head supporting assembly in the direction parallel to the disk plane;
wherein said head supporting assembly is the head supporting assembly set forth in claim 12 .
19. A disk drive apparatus comprising:
a disk;
rotative driving means for driving said disk; and
head driving assembly for performing writing information into a predetermined track position of said disk or reading information out of a predetermined track position, wherein
said head driving assembly is the head driving assembly set forth in claim 18 .