Patent ID: 6765754
Filing Date: 2004-07-20
Classification: G11B

Abstract:
A flexible disk drive comprising:a main frame in which a flexible disk is inserted, said main frame having a frame main surface and a frame back surface; a motor, mounted on the frame main surface of said main frame, for rotatably driving said flexible disk inserted in said main frame, said motor having a rotation axis, said motor comprising a rotor rotatably disposed around the rotation axis and a stator combined with said rotor, said rotor having an external peripheral side surface on which an index detection magnet is mounted; a circuit board, mounted on the frame back surface of said main frame, for mounting a control circuit for carrying out a driving control of said motor thereon, said circuit board comprising a main circuit board for mounting said control circuit thereon and for extending in a direction perpendicular to the rotation axis of said motor and a sub circuit board attached to said main circuit board at a position close to the external peripheral side surface of said rotor so as to extend in a direction in parallel with the rotation axis of said motor; and an index detection Hall element mounted to said sub circuit board, said index detection Hall element having a magnetic field detection surface which is disposed so as to oppose to the external peripheral side surface of said rotor.