Reduced friction disc cartridge shutter sirfaces

摘要

Projections and recesses or the like are formed or an adhesive is coated on slide contact surfaces of a main cartridge body rotatably accommodating a disk such as a magnetic disk or an optical disk and a shutter mounted movably on the main cartridge body for opening or closing an opening formed in the main cartridge body for exposing a portion of the disk to outside to provide the slide contact surfaces with low friction to prevent wear of the shutter and/or the main cartridge body.