Information storage system utilizing electrets
US4566086A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1983 |
| Grant date | Jan 21, 1986 |
| Priority date | — |
| Expiry date | Jun 13, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for reading and storing data includes a rotating transparent substrate having a layer of dielectric material disposed thereon. A movable support member positioned adjacent one side of the substrate includes a radiant energy source and an electrical field generator which, when energized, produces an electret in the dielectric material when heated to an electret forming temperature by the radiant energy source and which polarizes light rays from the radiant energy source in a direction representing a binary value. An optical detector mounted on a support member adjacent the opposite side of the substrate detects the presence or absence of the polarized light and generates electrical signals representing such conditions. The electrical field generator includes a plurality of pole members for producing an electret having more than one plane of polarization, each of which represents a different binary value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.