Patent ID: 7073741
Filing Date: 2006-07-11
Classification: G11B

Abstract:
1. A magnetic tape cassette comprising: a cassette case which rotatably contains a pair of reels around which a magnetic tape is wound; an open and close lid attached to said cassette case so as to cover said magnetic tape; first and second cam grooves including curved portions and provided at the same position on opposite sides of said cassette case so as to guide first and second slide pins which are projected from the same position on opposite sides of said open and close lid; and a biasing member located near one of said cam grooves for urging said open and close lid in a closing direction, wherein a gap between an inner face of said curved portion of said first cam groove and an outer peripheral face of said first slide pin is different from a gap between an inner face of said curved portion of said second cam groove and said outer peripheral face of said second slide pin, and wherein each of said first and second cam grooves includes a rectilinear portion, said curved portion of each of said first and second cam grooves includes an open end through which said first and second slide pins enter said first and second cam grooves, respectively, and a width W