AUTOMATIC REWIND DETECTION FOR MAGNETIC TAPE CASSETTES

摘要

An apparatus and method for determining the position of magnetic tape within a magnetic tape cassette to ascertain whether the magnetic tape is in a rewoun d position within the cassette is provided. In a first aspect of the present invention, the magnetic tape cassette has two internal magnetic tape take-up reels. The magnetic tape stored on the tape-up reels is detected. The rewoun d status of the tape is determined by whether the magnetic tape is detected on only one reel or on both reels. In a second aspect of the present invention, a preselected amount of magnetic tape is detected within the magnetic tape cassette. The magnetic tape cassette is oriented and the position of the detected magnetic tape is determined relative to the orientation of the magnetic tape cassette. In a third aspect of the present invention, an electronically detectable member positioned in a known location of the cassette is detected. A preselected amount of magnetic tape within the cassette is detected. The time difference between the detection of the magnetic tape and the detection of the electronically detectable member is used to determine the position of the magnetic tape relative to the cassette . The electronically detectable member can be an electronic article surveillan ce marker.