Light modulating device
US4889414A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1985 |
| Grant date | Dec 26, 1989 |
| Priority date | — |
| Expiry date | Sep 25, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/11
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a device for transmitting light, means for controlling the transmissivity of the device, including a ceramic, reversibly electrochromic, crystalline element having a highly reflective state when injected with electrons and charge compensating ions and a highly transmissive state when the electrons and ions are removed, the crystalline element being characterized as having a reflectivity of at least 50% in the reflective state and not greater than 10% in the transmissive state, and means for modulating the crystalline element between the reflective and transmissive states by injecting ions into the crystalline element in response to an applied electrical current of a first polarity and removing the ions in response to an applied electrical current of a second polarity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.