Constant temperature type crystal oscillator

摘要

A constant temperature type crystal oscillator which uses a surface mounting crystal resonator, in which a surface mounting crystal resonator (22) is mounted on a circuit board (21b) together with an oscillating element (24) and a temperature control element (25), characterised in that said crystal resonator (22) is installed on one principal plane of a ceramic substrate (34), and at least a chip resistor (35a,35b) for heat generation, and a highly temperature-dependent, highly heat-sensitive element (25a) are installed on the other principal plane of said ceramic substrate (34).