Tape cassette having an improved tape detection optical path

Details Tape cassette having an improved tape detection optical path Tape cassette having an improved tape detection optical path

G - Physics

11

B

G11B 15/08 (2006.01) G11B 23/04 (2006.01)

Patent

CA 2158090

An optical path for a tape cassette is formed by, between the light source and the tape, a pair of upper collimating walls extending from a base of the cassette and a pair of lower collimating walls depending from the upper half of the cassette. The lower and upper walls cooperate to form a horizontal collimating slot to ensure that light from the light source does not reflect over or under the tape and thereby cause false readings at a detector positioned outside the cassette. In addition, collimating slots are provided at the light exit side of the cassette that no light reflecting from the walls of the cassette reaches the detector, so as to ensure an accurate reading of the point where the transition portion of the tape between the transparent leader and the opaque recording material crosses the optical path.

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