Patent ID: 7265929

Claim:
A disk apparatus comprising: (a) a head supporting arm having a tab at a tip of a first end of the arm and a head slider at the first end, which head slider has a signal converting element for recording and reproducing a signal on and from a recording medium, and a voice coil at a second end of the arm; (b) an actuator supporting the head supporting arm rotatably around a horizontal rotating shaft for rotating in parallel with a surface of the recording medium and around a vertical rotating shaft for rotating vertically with respect to the surface of the recording medium, and supported by a resilient member placed around the vertical shaft, which the resilient member energizes the actuator vertically toward the recording medium; (c) a voice coil motor including; (c-1) a pair of yokes placed sandwiching the voice coil vertically and confronting the voice coil; (c-2) a magnet fixed to at least one of the yokes, (d) a ramp block including; a ramp section and a refuge place both on which the tab of the head supporting arm slides; and (e) an actuator control circuit which applies a driving current to the voice coil so that the tab held at the refuge place is urged against a second plane of the refuge place in the ramp block, then applies another driving current to the voice coil so that the tab can leave the second plane, thereby moving the head slider disposed to the actuator from the ramp block toward the recording medium.