| 摘要 |
A tape cassette comprises a pair of casing halves which are disposed in abutting relationship. The cassette internally houses a length of a magnetic tape which is disposed on a pair of tape hubs and which is exposed at a number of tape exposure ports located in one lateral edge thereof for engagement with tape drive means as well as a selected magnetic head, which are driven into the ports when the cassette is loaded on a tape recorder. The magnetic tape is magnetically processed by the selected magnetic head as the tape hub in the cassette is driven by the drive means located on the part of the tape recorder to run the magnetic tape. The opposite ends of the magnetic tape are secured to the pair of tape hubs by a pair of detents which are adapted to resiliently engage recesses formed in the peripheral edge of the respective tape hubs. The tape exposure ports of the tape cassette are defined in one lateral edge of the cassette by a plurality of sets of cooperating frame portions which are complementarily shaped in staggered relationship with respect to each other. A gap is formed between the frame portions of the oppositely located casing halves, and either forms an angle of inclination to the running direction of the tape or includes a plurality of gap portions which are displaced from each other crosswise of the tape and connected together by an interconnecting gap portion, thus preventing an unintended withdrawal of the magnetic tape from within the tape cassette. The tape cassette may be provided with lugs which may be broken to prevent an inadvertent erasure. The openings or apertures for receiving these lugs are covered with a detachable label, thereby facilitating the removal and the repeated use of the lugs.
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