| 摘要 |
PCT No. PCT/GB97/00768 Sec. 371 Date Oct. 26, 1998 Sec. 102(e) Date Oct. 26, 1998 PCT Filed Mar. 19, 1997 PCT Pub. No. WO97/35307 PCT Pub. Date Sep. 25, 1997An optical data storage disc having a first component disc formed over one side with a pattern of indentations defining digital data, the indented side of the first component disc being provided with a reflective coating, and a second component disc being bonded to the indented side of the first component disc. The second component disc carries a surface relief pattern having continuous variations in depth over a range of depths, and defining a holographic, or other optically variable, image. |
