| 摘要 |
<p>A tape (41) cassette (1) with a pivotal lid (10, 15, 19) having a tape (41) wound on reels (42) inside a cassette (1) made up of upper and lower shells and light holes in the sides of the cassette (1) for detecting the ends of the tape (41) using light beams is made easy to assemble by dustproofing ribs for preventing dust and the like from entering through the light holes each being split into two dustproofing rib parts, one of these parts being provided on the pivotal lid (10, 15, 19) and the other being provided on the lower shell. The dustproofing rib parts are so disposed that with the pivotal lid (10, 15, 19) in an open position the upper shell can be assembled to the lower shell easily in one straight-line movement without its direction being changed. Facing surfaces of the two dustproofing rib parts constituting each dustproofing rib are sloping or stepped to effectively prevent dust from passing between the dustproofing rib parts. <IMAGE></p> |
