Patent ID: 8792204
Filing Date: 2014-07-29
Classification: G11B

Abstract:
1. A base plate of a disk drive apparatus which rotates a disk centered on a central axis which extends vertically, the base plate comprising: a motor base which is disposed around the central axis and is made of a metallic material of a first type; and a base body portion which extends radially outward of the motor base and is made of a metallic material of a second type; wherein a Young's modulus of the metallic material of the first type is larger than a Young's modulus of the metallic material of the second type; the motor base includes: the base body portion includes an inner end portion which is in contact with an outer circumferential surface of the wall portion; and the flange portion and the plastic deforming portion are respectively in contact with at least a portion of each of both axial end surfaces of the inner end portion of the base body portion.