ULTRASTABLE OSCILLATOR OPERATING AT ATMOSPHERIC PRESSURE AND IN VACUO

摘要

The invention concerns an oscillator which is ultrastable in frequency and operates at atmospheric pressure and in vacuo. It comprises a piezoelectric resonator (1) consisting of a piezoelectric blade (2) potted in a casing consisting of a cover (7) and a base (8). The resonator (1) is placed in a thermostatically-controlled housing (10) consisting of an inner tank (40) screwed into an outer tank (30). These tanks (30, 40) each have sides (34, 44) and a base (35, 45). A thermal seal (16) is inserted between the base (35) of the outer tank (30) and the base (45) of the inner tank (40). The whole of the outer surface of the resonator cover (7) is brazed to the sides (44) and the base (45) of the inner tank (40). The thermostatically-controlled housing (10) is fitted in a secondary housing (21). A narrow space (23) separates the two housings (10, 21) and the contacting surface between the two housings is as small as possible. Application to ultrastable chipboard oscillators.