Information storage system
US5109287A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 1989 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | May 31, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C7/005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Data stored on a remotely-located storage sheet (29,30,31) which may, for example, be a sheet of a spare-parts manual used in the motor trade, can be updated by transmitting a signal from a central station (20) to a receiver (21,22,23) at the remote location. The storage sheet may be in the form of a microfiche. A liquid crystal storage device is used as the storage sheet, which device can be updated by light from a simple laser printer, an imaging array, or a CRT screen at the remote location, operated by the transmitted signal. This avoids the need to replace storage sheets when updating is necessary. The storage sheet may include two electrically conductive layers (2,6) between which are disposed a layer of a liquid crystal storage material (5) and a photoconductive layer (3). The liquid crystal material may be, for example, a liquid crystal polymer or a glassy nematic liquid crystal material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.