| 摘要 |
A structure for mounting at least a spring arm on at least a head arm is disclosed, which can meet the requirement for high recording density in a disk apparatus by effectively reducing the vibration of the head unit in operation. A head actuator includes at least a pair of heads mounted at the forward end of the head arm through the spring arm for reading/writing information in a discoidal recording medium. The base of the spring arm is fixedly welded to a fixing member. The head arm and the fixing member are coupled to each other by a caulking protrusion as a coupler formed on the fixing member. The overlapped portion of the head arm and the fixing member other than the coupler is formed with a vibration damping layer for preventing vibrations of one of the head arm and the fixing member from propagating to the other. This vibration damping layer is composed of a simple air gap or a vibration damping material filled in the air gap.
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