Patent ID: 6826016
Filing Date: 2004-11-30
Classification: G11B

Abstract:
A magnetic disk apparatus comprising:a magnetic disk; a plurality of magnetic heads for recoding/reproducing of information with respect to the magnetic disk; a carriage assembly supporting the magnetic heads movably with respect to the magnetic disk, the carriage assembly including a bearing unit, and a plurality of head suspension assemblies each of which has a proximal end portion supported by the bearing unit and a distal end portion on which one of the magnetic heads is mounted; and a main flexible printed circuit board having a connection end portion attached to the carriage assembly, and a proximal end portion positioned apart from the connection end portion, wherein each of the head suspension assemblies includes an arm extending from the bearing unit, a suspension projecting from an extended end of the arm, an elongate relay flexible printed circuit board provided on the arm and the suspension and having a distal end portion electrically connected to the magnetic head and a proximal end portion connected to the connection end portion of the main flexible printed circuit board, and a head IC mounted on the relay flexible printed circuit board near the magnetic head, the relay flexible printed circuit board includes a signal line, a power source line, and a ground line extending from the magnetic head to the proximal end portion through the head IC, the main flexible printed circuit board includes a plurality of sets of connection pads, in correspondence with the plurality of head suspension assemblies, the connection pads of each set includes first, second and third connection pads respectively connected with the signal line, power source line and ground line of the relay flexible printed circuit board, and the main flexible printed circuit board includes a connection line which connects the plurality of third pads with each other, a ground line extending from one of the third connection pads to the proximal end portion, and a plurality of signal lines extending respectively from the first and second connection pads to the proximal end portion.