Liquid crystal chopper and infrared sensor
US5036199A · kind A · utility
1Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1990 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Feb 20, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2224/48137
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid crystal chopper comprising a pair of electrically conductive substrates, a spacer keeping the substrates so as to define a space between the substrates, and a liquid crystal of DSM type which is enclosed in the space, with a dielectric anisotropy of -0.5 or more and not exceeding 0. An infrared sensor using the liquid crystal chopper in the above construction as a chopper mechanism to intermittently interrupt infrared rays incident upon the pyroelectric element. The infrared sensor has a short response time at the liquid crystal chopper and consumes less power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.