Disk drive having magnetic head conduction paths with arrangements to control impedance
View Patent ↗Magnetic disk apparatus includes an electric wiring capable of satisfying an electric condition under which high frequency recording higher than or equal to 200 MHz, a magnetic head having at least a recording device to a magnetic recording medium, and also the electric wiring corresponding to a recording current supplying device to this magnetic head are formed on a suspension member for mechanically suspending the magnetic head, the recording current being supplied to a magnetic head recording device by employing such electric wiring, the characteristic impedance of which is higher than a maximum impedance of the magnetic head recording device.
1. A magnetic disk apparatus comprising:
a magnetic recording medium;
a magnetic recording head suspended by a suspension member and provided opposite to a surface of said magnetic recording medium;
a reproducing head suspended by the suspension member and provided opposite to the surface of said magnetic recording medium;
a recording/reproducing circuit;
a first electric wiring pair formed above said suspension member, connecting said recording/reproducing circuit and said magnetic recording head;
a second electric wiring pair formed above said suspension member, connecting said recording/reproducing circuit and said reproducing head;
an arm supporting said suspension member;
a carriage holding said arm;
a rotary actuator driving said carriage; and
a spindle motor rotating said magnetic recording medium; wherein:
an interval between the electric wirings which constitute said first electric wiring pair is made wider than an interval between the electric wirings which constitute said second electric wiring pair.
2. A magnetic disk apparatus as claimed in claim 1 , wherein:
the characteristic impedance of the electric wiring pair for said magnetic recording element is higher than impedance of said magnetic recording element.