公开(公告)号：US20020034047A1

公开(公告)日：2002-03-21

申请号：US09955950

申请日：2001-09-20

Applicant: Victor Company of Japan, Ltd.

Inventor： Toshio Imamura ,  Rumi Omido

IPC: G11B023/02

CPC classification number: G11B23/08714

Abstract: A magnetic tape cassette for use in an apparatus having a light source (P) and a light sensor (S1, S2) for detecting a tape end by the difference of light transmittance of a tape (T). The magnetic tape cassette (AA, BB, CC) is composed of a light-shielding member (a through r) crossing a light path (L1, L2) for detecting the tape end by the difference of light transmittance of the magnetic layer portion and the leader portion to keep the light transmittance within the predetermined value even the tape (T) is thinner and has a higher light transmittance.

Abstract translation: 一种用于具有光源（P）和光传感器（S1，S2）的装置中的磁带盒，用于通过带（T）的透光率差来检测带端。 磁带盒（AA，BB，CC）由与磁带端部的光程差（L1，L2）相隔的光屏蔽部件（a〜r） 即使带（T），将透光率保持在预定值内的引导部分更薄并且具有更高的透光率。