TEMPERATURE CONTROL CIRCUIT AND HIGH STABLE PIEZOELECTRIC OSCILLATOR EMPLOYING THE SAME

摘要

PROBLEM TO BE SOLVED: To solve the problem wherein it takes a long time when determining the optimum mount position of a temperature sensor by a qualification test because temperature distribution around a crystal resonator differs depending on a model of a high stable crystal oscillator in the case of carrying out temperature control by arranging the temperature sensor close to the crystal resonator of the high stable crystal oscillator.;SOLUTION: The high stable crystal oscillator is configured such that changeover switches S1 to S3 are respectively connected in series with thermisters TH1 to TH3 mounted on printed wiring boards 4a, 4b sandwiching the crystal resonator and connected to ground, and the changeover switches S1 to S3 are mounted on the upper side of the printed wiring board 4a in a way of easily applying opening/closing operations to the changeover switches S1 to S3 when a case 7 is opened.;COPYRIGHT: (C)2007,JPO&INPIT