Methods and apparatus for recording electric signals
US4312004A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1979 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | May 7, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R13/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Electric signals are recorded on a recording medium having a light sensitivity extending to wavelengths shorter than 475 nm, with an array of electrically switched lanthanum modified lead zirconate titanate (PLZT) light gates located between a light polarizer and a complementary light analyzer. The light gates are illuminated through the polarizer with light whose wavelength essentially is longer than 475 nm. Such light is selectively gated through electrically switched light gates through the analyzer and to the recording medium having a light sensitivity extending to wavelengths shorter than 475 nm. Information recordings may be made in this manner over extended periods of time without the typical performance degradation through photoinduced birefringence observed with conventionalPLZT electrooptic shutters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.