| 摘要 |
<p>PURPOSE:To simplify the device, and to reduce its cost by providing a light transmissible part on the start and the end parts of a tape, and detecting a transmitted light of the tape from two directions by a light emitting element and a light receiving element which are installed in the inside and the outside of a cassette. CONSTITUTION:A light beam from an LED 7 provided on the inside of a cassette 6 passes through detecting ports 5 in paths of two directions, and reaches a phototransistor 8 through mirrors 1, 2 and 3, 4. As for a tape a light transmittable part having no magnetic layer is formed in the start part and the end part, therefore, when the end part of a running tape comes, the light beam is reflected by the mirrors 1-4 and photodetected by the transistor 8, and the start part and the end part are detected. Therefore, the transistor 8 outputs a tape running stop signal, and stops running of the tape. In such a way, the device is simplified, and the cost can be reduced.</p> |
