公开(公告)号：US06607155B2

公开(公告)日：2003-08-19

申请号：US09963405

申请日：2001-09-27

申请人： Satoru Takaha ,  Yasufumi Hashimoto

发明人： Satoru Takaha ,  Yasufumi Hashimoto

IPC分类号： G11B23087

CPC分类号： G11B23/08714 ,  G11B23/08785

摘要： A magnetic tape cassette for use in an apparatus having a light source and a light sensor (5a, 5b) for detecting a tape end by the difference of light transmittance of a tape. The magnetic tape cassette (1) is composed of a cassette housing for having a transparent or semi-transparent upper half (1b) and a lower half (1a), and the reel being connected with the tape, and a light exit (7A, 7B) being opposed to the light sensor (5a, 5b) when the tape cassette is loaded to a predetermined position in the apparatus, for passing light from the light source to the light sensor through the light exit, wherein a light path (4a, 4b) of the light emitted from the light source crosses a travel path of the tape, a light-shielding member (2a, 2b) for limiting the light emitted from the light source, placed contiguous to the light exit, and a rib (81, 83) being formed in the upper half and the lower half (1a, 1b) wherein a plurality of triangular shaped prisms (83a) is formed serially on at least one side of the rib (83).