| 摘要 |
<p>PCT No. PCT/GB92/01920 Sec. 371 Date Apr. 7, 1994 Sec. 102(e) Date Apr. 7, 1994 PCT Filed Oct. 19, 1992 PCT Pub. No. WO93/08565 PCT Pub. Date Apr. 29, 1993.An optical data storage disc, for example, a compact disc, has one side formed with a pattern of indentations defining a digital data recording, and this side is metallized and further coated with a layer, which is embossed with a relief pattern defining a holographic image. The hologram may extend across the whole surface of the disc and is visible from the top side of the disc, while digital information is readable in a conventional manner using a laser directed at the underside of the disc.</p> |
