| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a mirror positional shift caused by impacts or the like so as to avoid the detection failure of the starting or finishing end of a recording tape by fixing the support frame supporting piece of a mirror for reflecting a detecting luminous flux and projecting this to the recording tape to a base plate part by a cartridge cover part boss. SOLUTION: The support frame 1 of a mirror 2 is fixed by pressing its supporting piece 4 with a boss part 5 projectingly provided from the overhead part of the cover part 8 of a cartridge to a base plate part 6. Accordingly, even when impacts are applied by falling or the like, the supporting frame 1 is prevented from being position-shifted from the base plate part 6 to be inclined. Thus, since the inclination of the supporting frame 1 is prevented during use of a data cartridge and the inclination of the mirror 2 is also prevented, a detecting luminous flux made incident from a detection through-hole is reflected by the mirror 2 and then made surely incident on the detected hole of the recording tape. That is, in this data cartridge, even after impacts are applied by falling or the like, the impossibility of recording/reproducing data is prevented.</p> |
