Patent ID: 8581670

Claim:
An oscillation device compensating a set value of an output frequency based on a detection result of ambient temperature, said oscillation device comprising: a first quartz-crystal oscillator structured by providing first electrodes on a quartz-crystal piece; a second quartz-crystal oscillator structured by providing second electrodes on a quartz-crystal piece; a first oscillation circuit and a second oscillation circuit connected to said first quartz-crystal oscillator and said second quartz-crystal oscillator, respectively; a frequency difference detecting unit determining, when an oscillation frequency of said first oscillation circuit is set to f 1 , an oscillation frequency of said first oscillation circuit at a reference temperature is set to f 1 r , an oscillation frequency of said second oscillation circuit is set to f 2 , and an oscillation frequency of said second oscillation circuit at the reference temperature is set to f 2 r , a value corresponding to a difference value between a value corresponding to a difference between f 1 and f 1 r , and a value corresponding to a difference between f 2 and f 2 r ; and a compensation value obtaining unit obtaining a frequency compensation value of f 1 because the ambient temperature is different from the reference temperature, based on the value corresponding to the difference value detected by said frequency difference detecting unit, and a relation between the value corresponding to the difference value and the frequency compensation value of the oscillation frequency f 1 of said first oscillation circuit: and wherein the value corresponding to the difference value between the value corresponding to the difference between f 1 and f 1 r and the value corresponding to the difference between f 2 and f 2 r is [{(f 2 -f 2 r )/f 2 r }-{(f 1 -f 1 r )/f 1 r }]; wherein an output of said oscillation device is structured to be generated by utilizing an output of said first oscillation circuit; and wherein the set value of the output frequency is structured to be compensated based on the frequency compensation value determined by said compensation value obtaining unit.