Accelerated warm-up crystal oven
US4396892A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1981 |
| Grant date | Aug 2, 1983 |
| Priority date | — |
| Expiry date | Jan 21, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L1/04
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Temperature stability is quickly achieved for a crystal oscillator mounted in a warm-up crystal oven because the heat is applied proportionally to the mass of the oscillator and circuitry during the initial warm-up period of time and then applied proportionally to the area that will allow compensation for thermal loss after the warm-up period. The oscillator crystal is encapsulated within a case along with an oscillator circuit for the oscillator crystal that is thermally mounted to the case. A controlled heater heats the warm-up crystal oven and crystal oscillator. The controlled heater is controlled by a temperature controller that responds to a first thermal sensor that senses the temperature of the case and a second thermal sensor that senses the temperature of the controlled heater.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.