Patent ID: 6533569
Filing Date: 2003-03-18
Classification: B29C,Y10S

Abstract:
A mold for producing optical discs comprising:a mold piece with a mold face for contact with a disc to be molded, sides oriented transverse to the mold face, and at least one face cavity penetrating the mold face; a cavity ring comprising a flat annular ring with one surface in contact with the mold face and an inner boundary defining a mold cavity to hold hot plastic that is used to form a molded disc; an extension extending transversely from the surface of the cavity ring which is in contact with the mold face, with the extension located so that the extension fits into a said face cavity penetrating the mold face when the cavity ring is in contact with the mold face; and attachment means located in holes in the sides of the mold piece with the attachment means constructed to contact the cavity ring's extension when the extension is within said face cavity in the mold face and to lock the cavity ring against the mold face.