Method of making laser disc memory storage article
US4292109A · kind A · utility
Inventor
Key dates
| Filing date | Sep 14, 1979 |
| Grant date | Sep 29, 1981 |
| Priority date | — |
| Expiry date | Sep 14, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/2542
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A flexible laser disc for laser disc mass storage and retrieval of digital data, employs vacuum encapsulation of the laser storage medium in a saturated polyester plastic (PMMA), or other suitable, transparent plastic material, polymethylmethacrylate. The embedded laser storage medium is a low-melting thin film, in which the digital data are stored within laser-focus in the form of diffraction-limited "holes" (bits), created by means of signal-modulated strong laser radiation. The holes (bits) are time-sequentially arranged in the form of spiral or circular tracks of distinct separation. Data are instantaneously and secondarily retrieved with a laser, utilizing phase-lock and servo-controlled tracking with a mirror galvanometer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.