Patent ID: 6466390
Filing Date: 2002-10-15
Classification: G11B

Abstract:
A recording and/or reproducing apparatus for a magnetic tape of a tape cassette, comprising:a supply side reel for reeling out the magnetic tape; a takeup side reel for taking up the magnetic tape; rotation detection means for detecting rotation of the supply side reel and the takeup side reel; a running mechanism for running the magnetic tape at a constant speed, the running mechanism having a capstan and a capstan motor for rotationally driving the capstan and being adapted for running the magnetic tape at the constant speed; and control means for controlling the capstan motor based on results detected by the rotation detection means, wherein the control means supplies a control signal to the capstan motor until a period of a detection signal from the rotation detection means reaches a pre-set period so that the capstan motor is rotated in a reverse direction when a running speed of the magnetic tape is slowed by the running mechanism, generates a duty cycle of the control signal based on the rotation detection results of the supply side reel detected by the rotation detection means, routes the generated duty cycle to the capstan motor, calculates an amount of the magnetic tape wound around the supply side reel based on the rotation detection results detected by the rotation detection means and generates the control signal based on the calculated amount of tape, and wherein the control signal is a PWM signal and has a polarity for rotating the capstan motor in a reverse direction when rewinding the magnetic tape.