Patent ID: 6327117
Filing Date: 2001-12-04
Classification: G11B

Abstract:
A disc cartridge comprising:a main cartridge body portion for housing a disc-shaped recording medium having inner and outer rims;recording/reproducing apertures formed in said main cartridge body portion for exposing a portion of a signal recording area of the disc-shaped recording medium across the inner and outer rims of the disc-shaped recording medium;a shutter member having shutter portions for opening/closing the recording/reproducing apertures and supporting portions provided on both sides of the shutter portion in a direction of movement thereof and supported for movement by said main cartridge body portion; andmovement guide portions in the main cartridge body portion on both sides of the recording/reproducing apertures in a width-wise direction thereof which is parallel to the movement direction of said shutter member, said supporting portions engaging said movement guide portions for reliably moving said shutter member between positions opening/closing the recording/reproducing apertures;said recording/reproducing apertures having open ends thereof extending to an extent thereof toward a front side of said main cartridge body portion between said movement guide portions and said front side of said main cartridge body portion such that the signal recording area extends as far as the vicinity of the outer rim of the disc-shaped recording medium; andwherein said movement guide portions include guide grooves extending along the movement direction of said shutter member, and wherein guide pieces movably inserted into said guide grooves are formed on inner sides of the supporting portions of the shutter member so that the inner sides of said supporting portions represent slide contact surfaces making sliding contact with both axial sides of said guide grooves.