Hard disk drive adapted to prevent release of strain between voice coil motor and base
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsSatoshi Hayakawa, Eiji Soga, Kohichi Takeuchi, Takashi Kumazawa
Life of this patent
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Abstract
Embodiments of the invention provide a hard disk drive base adapted to prevent release of a strain due to the difference in thermal expansion between the vice coil motor and the base and thereby prevent a degradation in the positioning accuracy of the magnetic head. In one embodiment, a hard disk drive base is provided which includes a plurality of contact surfaces to which a lower yoke of a voice coil motor is fixed and thin portions each formed around a respective one of the plurality of contact surfaces and having a thickness smaller than that of other portions of the base.
Claims11
A hard disk drive base comprising:
- a plurality of contact surfaces to which a lower yoke of a voice coil motor is to be fixed;
- and
- thin portions each formed around a respective one of said plurality of contact surfaces and having a thickness smaller than a thickness of other portions of said base,
- wherein said plurality of contact surfaces include:
- a first contact surface formed around a positioning hole such that the first contact surface protrudes a first predetermined height, said first contact surface being in contact with said lower yoke, said positioning hole being engaged with a projection of said lower yoke;
- and
- a second contact surface formed around a through hole such that the second contact surface protrudes a second predetermined height, said second contact surface being in contact with said lower yoke, said through hole receiving a clamping screw therethrough with which said lower yoke is fixed to said base, wherein said thin portions include:
- a first thin portion formed around said first contact surface such that the first thin portion has a ring shape concentric with said positioning hole, said first thin portion having a thickness smaller than the thickness of said other portions of said base;
- and
- a second thin portion formed around said second contact surface such that the second thin portion has a ring shape concentric with said through hole, said second thin portion having a thickness smaller than the thickness of said other portions of said base.
A hard disk drive comprising:
- a voice coil motor having a lower yoke;
- and
- a base comprising,
- plurality of contact surfaces to which a lower yoke of a voice coil motor is to be fixed;
- and
- thin portions each formed around a respective one of said plurality of contact surfaces and having a thickness smaller than a thickness of other portions of said base, wherein said plurality of contact surfaces include,
- a first contact surface formed around a positioning hole such that the first contact surface protrudes a first predetermined height, said first contact surface being in contact with said lower yoke, said positioning hole being engaged with a projection of said lower yoke;
- and
- a second contact surface formed around a through hole such that the second contact surface protrudes a second predetermined height, said second contact surface being in contact with said lower yoke, said through hole receiving a clamping screw therethrough with which said lower yoke is fixed to said base, and
- wherein said thin portions include,
- a first thin portion formed around said first contact surface such that the first thin portion has a ring shape concentric with said positioning hole, said first thin portion having a thickness smaller than the thickness of said other portions of said base;
- and
- a second thin portion formed around said second contact surface such that the second thin portion has a ring shape concentric with said through hole, said second thin portion having a thickness smaller than the thickness of said other portions of said base.
Dependencies are inferred from the claim text.