Pyroelectric-type IR receiving element and IR sensor using the same
US6121614A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 14, 1997 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Apr 14, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J5/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pyroelectric-type IR receiving element comprises a pyroelectric substrate which is fixed to a supporting body at its support ends and at least one rectangular patch formed in the substrate. The patch is formed on its opposite surfaces with first and second electrodes which are overlapped to each other. The substrate has a U-shaped slit composed of a pair of side slits and a base slit connecting the side slits. The U-shaped slit surrounds continuously three sides of the patch, so that the patch is supported by the substrate in a cantilever fashion at a cantilever end which is opposed to one of the support ends of the substrate. Since a thermal stress applied to the substrate when the substrate is exposed to a temperature change is absorbed by the U-shaped slit, a stress concentration to be considered is not developed in the patch. As a result, it is possible to reduce the occurrence of popcorn noise, while maintaining good IR sensitivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.