Baseplate for disk drive suspension and method for manufacturing baseplate

  • US 8,537,498 B2
  • Filed: 12/06/2012
  • Issued: 09/17/2013
  • Est. Priority Date: 05/08/2009
  • Status: Active Grant
First Claim
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1. A baseplate of a suspension fixed to an actuator arm of a disk drive, the baseplate being formed from heat-treated austenite stainless steel and comprising a cylindrical boss portion configured to be inserted into a mounting hole formed in the actuator arm, wherein:

  • the boss portion comprises a ball insertion hole, which penetrates the boss portion along an axis thereof, and a chemically-polished surface formed on an inner circumferential wall of the ball insertion hole,the chemically-polished surface has an oxygen-rich layer of which an oxygen concentration is higher than a chromium concentration near a surface,a thickness of the oxygen-rich layer is thinner than a thickness of an oxygen-rich layer of a non-chemically polished surface, anda frictional resistance when a ball is inserted in a direction in which the boss portion is pulled is smaller than a frictional resistance when the ball is inserted in a direction in which the boss portion is compressed.

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