| 摘要 |
<p>A tape cassette of the type in which a tape-shaped medium (4) having a light transmissivity at a predetermined portion is wound between an upper cassette half and a lower cassette half (3) so as to surround a light emitting element insertion portion (19), a light receiving window (21) is formed through a side wall (3a) of the upper cassette half or the lower cassette half (3) so as to oppose to the light emitting element insertion portion (19) across the tape-shaped medium (4), whereby when the type cassette is loaded into a recording and reproducing apparatus, a light emitting element (27) is inserted into the light emitting element insertion portion (19) and a light receiving element (28) is located outside of the light receiving window (21), thereby detecting the predetermined portion of the tape-shaped medium (4) and wherein light-shielding ribs (16) formed on the upper cassette half or the lower cassette half (3) so as to face to each other across a light path (L1) extend from the light receiving element insertion portion (19) to the light receiving window (21), and a tunnel core piece member (40) is provided among the side wall (3a) having a light receiving window (40b) and light-shielding ribs (40a) so as to surround the light path (L1), whereby even when the tape cassette is formed as a color tape cassette, a start sensor or an end sensor can be pevented from malfunctioning.</p> |
