Active tape edge position control system

Lateral tape motion (LTM) is a major obstacle to using thinner tapes for greater storage capacity, because impacts between the tape and the flanges of the reel can damage the tape edges. This paper presents an active tape edge position control system employing a tilted rotary guide and photonic sensors. To avoid impacts with the flanges, the tape motion sensor should be placed as close to the reel as possible. Calibration of such a sensors must account for the changing tape path as the reel winds and unwinds. We present the calibration method, the controller design process for a complex proportional integral lead (CPIL) compensator, and the results of experiments, which show promise for reducing damage to tape from LTM at the reel.