Tape reel for tape cassette.

摘要

A tape reel structure for a tape cassette provides radially extending ribs (21) between an outer cylindrical section forming tape reel section (11) which is to have wound therearound a tape, and an inner cylindrical section (12) serving as a reel shaft boss. The ribs (21) at least have a portion extending substantially through overall length of the outer cylindrical section (11) so as to prevent radially inward deformation thereof. The ribs (21) join with the inner cylindrical section (12) at the radially inner edges. The upper end of the joining portion between the inner edge of the rib and the inner cylindrical section is at a lower elevation that the upper end of the joining portion between the outer edge of the rib and the outer cylindrical section. This height difference is effective for preventing the outer cylindrical section from forming wave-form uneveness during moulding process. The ribs extending substantially the overall length of the outer cylindrical section successfully prevents the outer cylindrical section from radially inward bending.