Patent ID: 6407887
Filing Date: 2002-06-18
Classification: G11B

Abstract:
A magnetic tape cassette comprising:upper and lower half casings; a pair of reels rotatably accommodated in said upper and lower half casings; a magnetic tape wound on said pair of reels; a lid which closes an opening formed in one end of said upper and lower half casings, and is opened when said magnetic tape is pulled out; a lid lock pawl having an end, said lid lock pawl provided at one end of said lid; and a lid lock locked to said lid lock pawl and swingably mounted on one end of said upper and lower half casings, said lid lock including a curve-shaped hook, a tip end abutted against a side surface of said lid lock pawl, and a reacting section which is energized when said magnetic tape is pulled out, wherein said curve-shaped hook has an arcuate surface located at an inner basal portion of said hook, said arcuate surface is curved around said end of said lid lock pawl to form an escape gap between said side surface of said lid lock pawl and said arcuate surface of said lid lock, thereby preventing the end of said lid lock pawl from contacting a portion of said arcuate surface located immediately adjacent to said tip end of said hook, and wherein said lid lock is urged by an elastic element so that said hook is locked to the side surface of said lid lock pawl, and unlocked from said lid lock pawl by the energization of said reacting section.