Patent ID: 6667851
Filing Date: 2003-12-23
Classification: G11B

Abstract:
A magnetic tape cassette used 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 loaded in the magnetic tape cassette, the magnetic tape cassette comprising:a tape having a magnetic layer portion for recording and reproducing information and a leader portion connecting with a reel for winding and unwinding the tape thereof, wherein the leader portion has higher light transmittance than the magnetic layer portion; a cassette housing enclosing the reel, the housing having a light exit opposite the light sensor when the magnetic 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; wherein the cassette housing further comprises an upper half cassette housing and a lower half cassette housing; and a light-shielding member being disposed in the light path, for decreasing the light transmittance of the tape being detected by the light sensor to a predetermined value.