Patent ID: 8203391

Claim:
An oscillating device having a temperature compensated crystal oscillator, comprising: a constant-temperature unit including a base made of a ceramic material that is formed into a box shape having a recess of which an opening is formed in a downside, with a plane area in contact with the temperature compensated crystal oscillator substantially equal to a bottom surface of the temperature compensated crystal oscillator and a size substantially equal to that of the temperature compensated crystal oscillator; a cover sealing the opening of the recess, and a semiconductor chip including a temperature control circuit for controlling so as to keep a temperature in the recess space of the base sealed by the cover constant, a temperature sensor, and a heating element, accommodated in the recess, the temperature compensated crystal oscillator in which a crystal oscillator circuit and a temperature compensation circuit are combined, being operated so as to keep a temperature of the crystal oscillator circuit by the temperature compensation circuit, and being mounted in close contact with an upper surface of the base of the constant-temperature unit which is an opposite side of the opening of the recess.