| 摘要 |
<p>A new video tape cassette includes a cassette housing (1) having an opening (2) formed therein at a position corresponding to the position of a mis-recording-preventing detecting aperture (52) of a conventional video tape cassette. The new tape cassette is intended for recording only in a new recording format, and the conventional tape cassette is intended for recording only in a conventional recording format. The opening (2) prevents recording when the new tape cassette is inserted by mistake into a conventional video tape recorder. A second mis-recording-preventing detector (3) and a detecting portion (4) are provided to ensure that it is impossible to record in the wrong format, regardless of whether a new or conventional-type tape cassette is inserted into a new or conventional-type video tape recorder. However, the new video tape recorder can be made "upwardly compatible", meaning that it can reproduce not only the novel magnetic tape (13) having the novel recording format but also the conventional magnetic tape having the conventional recording format.</p> |
