| 摘要 |
<p>PURPOSE:To decrease the number of parts of the titled 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 illuminating lamp 8 provided on the outside of a cassette 6 passes through detecting ports 5 through mirrors 1, 2 and 3, 4 in paths of two directions, and reaches a phototransistor 11 provided on the inside of the cassette 6. As for a tape, a light transmissible 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 11, and the start and the end parts are detected. Therefore, the transistor 11 outputs a tape running stop signal and stops running of the tape. In such a way, the number of parts of the device is decreased, and the cost can be reduced.</p> |
