Victor Company of Japan, Limited

Satoru Takaha

Yasufumi Hashimoto

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

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Mito, Japan

Satoru Takaha