Patent ID: 6948182
Filing Date: 2005-09-20
Classification: G11B

Abstract:
1. An optical disc, comprising: a disc main body including a clamping area and an information recording area outside said clamping area; and an outwardly protruded plate portion which outwardly protrudes outside said disc main body with an upper surface of said plate portion flush with an upper surface of said disc main body, wherein said outwardly protruded plate portion has a thickness smaller than that of said disc main body, wherein said disc main body is formed to have a thickness of 1.2 mm, and a lower portion of said disc main body is formed to have a size to be fitted in an 8 cm-diameter standard-sized main body fitting dented portion formed in a tray of a disc player, and said lower portion of said disc main body has a first weight increasing protrusion which protrudes downwardly at said lower surface thereof and an area other than said information recording area, and said first weight increasing protrusion has an outer peripheral edge which coincides with an outer peripheral edge of said lower portion of said disc main body, and wherein said outer peripheral edge of said lower portion of said disc main body has at least two positioning points to be disposed in the proximity of an inner peripheral edge of said disc main body fitting dented portion to thereby position said disc main body in said disc main body fitting dented portion when said lower portion of said disc main body is fitted in said disc main body fitting dented portion.