Patent ID: 6943983

Claim:
A flexible disk drive comprising: (i) a main frame adapted to have a flexible disk inserted therein; (ii) a motor mounted on a main surface side of the main frame for rotating the flexible disk, the motor comprising: a rotor rotatably arranged around a rotating shaft; and a stator coupled with the rotor and including an exciting coil; wherein an outer peripheral side face of the rotor has an index detecting magnet attached thereto; and (iii) a circuit board attached to a rear face side of the main frame and having a control circuit for controlling the motor mounted thereon, the circuit board comprising: a main circuit board which has the control circuit mounted thereon, and which extends in a direction orthogonal to the rotating shaft of the motor; and a sub circuit board which is attached to the main circuit board at a position proximate to the outer peripheral side face of the rotor, and which extends in a direction parallel to the rotating shaft of the motor; wherein the sub circuit board has an index detecting Hall element attached thereto such that a magnetic field detecting face of the Hall element opposes the outer peripheral side face of the rotor; wherein a portion of the main frame on which the motor is mounted includes a notched portion, and the sub circuit board has a plurality of cut grooves in an end portion thereof; and wherein a plurality of lead wires extend from the motor, and are supported by the plurality of cut grooves in the sub circuit board, and are connected to the main circuit board.