Image recording medium, a processing apparatus thereof, and an entrance/exit control system using the image recording medium
US5430277A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1993 |
| Grant date | Jul 4, 1995 |
| Priority date | — |
| Expiry date | Sep 21, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S283/901
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A visible image displaying medium comprises a substrate on which a visible image is formed, and a displaying layer, disposed on the substrate, when the displaying layer is heated to a first temperature, changing to a transparent state to display the visible image and when the displaying layer is heated to a second temperature higher than the first temperature, changing to a cloudy state to shut the visible image. Further, an apparatus for processing a recording medium which has a substrate on which a visible image is formed and a displaying layer, disposed on the substrate, when the displaying layer is heated to a first temperature, changing to a transparent state to display the visible image and when the displaying layer is heated to a second temperature higher than the first temperature, changing to a cloudy state to shut the visible image, the apparatus comprises means for heating the displaying layer to the first temperature to display the visible image, and means for reading the visible image on the recording medium through the displaying layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.