Head supporting assembly, head driving assembly, and disk drive apparatus

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 L1 from said connected portion to said fixed portion, the length L1 satisfying a relationship L2/L1≧10.5, where L2 is a length from said rotation-supporting portion to said connected portion.