Circuit card assembly having controlled expansion properties
US6359372B1 · kind B1 · utility
4Cited by
17References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 3, 2000 |
| Grant date | Mar 19, 2002 |
| Priority date | — |
| Expiry date | May 3, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2201/10151
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Piezoelectric material is embedded in epoxy layers of circuit cards to control thermal expansion and contraction as a function of temperature changes. A temperature sensor and thermostat generates a controlled voltage as a function of temperature and applies the voltage to piezoelectric blocks within the circuit card. Local areas of the circuit card can have different amounts of piezoelectric material or different thermostats. Piezoelectric blocks can be arranged in regular patterns or can be randomly or pseudo-randomly placed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.