Patent Number: 6,165,391

Title: Manufacture of optical data storage disc

Abstract: A method and apparatus forming a micro-relief pattern on a surface of an optical disc, which micro-relief pattern may form a holographic image in which a shim bearing a micro-relief pattern is pressed onto the surface of the disc and the apparatus used ensures that a greater force is applied to the periphery of the disc and the remainder of the surface on which it is desired to form the micro-relief pattern, such method and apparatus enables a satisfactory relief pattern to be formed over a substantial area of the surface of the disc.

Inventors: Vedamuttu; Paul (Gwent, GB)

Assignee: Nimbus Manufacturing (UK) Limited

International Classification: B30B 15/06 (20060101); B29C 59/02 (20060101); B29D 17/00 (20060101); G03H 1/02 (20060101); G11B 7/26 (20060101); G11B 7/0065 (20060101); G11B 7/00 (20060101); B29D 011/00 ()

Expiration Date: 12/26/2017