| 摘要 |
The two guide rollers which guide tape in a cassette along the narrow, apertured front wall of its casing are of conductive material and conductively connected with contacts accessible from outside the cassette. When the cassette is installed on a recorder, the contacts are engaged by corresponding contact elements in the control circuit of the recorder. A conductive coating on each end of the tape in the cassette is long enough to bridge the distance between the two guide rollers and thereby to close a circuit in the recorder which arrests the drive in the recorder for the tape reels in the cassette. Each tape end is secured to a reel in the cassette by means of a locking plate releasably engaging a circumferential recess in the drum portion of the reel, the film end being clamped between the plate and the body of the drum portion. Friction between the reels and the top and/or bottom plates of the cassette is reduced by a creased liner sheet whose crease forms a straight narrow ridge radial relative to the reel axis and resiliently engaging the reel. The recorded material may be indicated on a sheet of paper, plastic, or metal releasably retained on an outer surface of the top or bottom wall.
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