Patent ID: 8717714

Claim:
A magnetic head positioning and driving device in a positioning and driving system comprising: a rotating magnetic disk; a magnetic head slider that floats above the surface of the magnetic disk and writes data to and reads data from a track provided on the magnetic disk; an actuator that positions the magnetic head slider in a radial direction of the magnetic disk; and an amplifier that supplies electrical power to the actuator in accordance with an input signal and performs a drive operation, wherein the magnetic head slider is a magnetic head slider including a recording and reproducing element that writes and reads the data; a pair of heater elements that are arranged on both sides of the recording and reproducing element in a track width direction and generates heat by energization; and a member that is interposed between the recording and reproducing element and the heater element and expands and contracts according to cooling by heat generation and heat dissipation of the heater element; wherein a first wiring line that connects one heater element and a first diode in series and a second wiring line that connects the other heater element and a second diode in series are connected in parallel at both ends thereof to form two connection points so that conducting directions of the diodes are opposite to each other, wherein the amplifier is an amplifier having the capability of amplifying an input voltage so that voltages in both positive and negative directions are capable of being generated between two output terminals in accordance with an input signal, and wherein the two output terminals of the amplifier are wire-connected to the two connection points, respectively, so that one heater element is energized to displace the recording and reproducing element in one direction of the track width direction when the amplifier has applied the positive voltage, and the other heater element is energized to displace the recording and reproducing element in a direction opposite to the direction when the amplifier has applied the voltage in the negative direction.