Title: Constant temperature crystal oscillator
Application Number: 200610066098 Application Date: 2006.03.28
Publication Number: 1841920 Publication Date: 2006.10.04
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03B5/32,H03H9/02
Applicant(s) Name: Nihon Dempa Kogyo Co. Address:
Inventor(s) Name: Arai Junichi
Attorney & Agent: huang lunwei
Abstract:
     A constant temperature crystal oscillator includes on a circuit substrate: a surface-mount crystal resonator which is provided with two crystal terminals as mount terminals and a dummy terminal on the bottom surface, and has a metal cover; an oscillation circuit element which forms an oscillation circuit together with the crystal resonator; and a temperature control element which keeps a constant operation temperature of the crystal resonator, in which the temperature control element includes at least a heating chip resistor, a power transistor for supplying electric power to the chip resistor, and a temperature sensitive resistor for detecting the operation temperature of the crystal resonator, wherein a dummy terminal on the substrate side of the circuit substrate for connection to the dummy terminal of the crystal resonator is connected to a resistor terminal on the substrate side to which the temperature sensitive resistor is connected through a conductive path.
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