Patent ID: 8536952

Claim:
An oscillation device using quartz-crystal oscillators, 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 quart-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 time is set to f 1 rz , 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 time is set to f 2 rz , a value corresponding to a difference value ΔF between a value corresponding to a difference between f 2 and f 2 rz , and a value corresponding to a difference between f 1 and f 1 rz; and a compensation value obtaining unit for aging compensation obtaining a frequency compensation value of f 1 based on an elapse of time from the reference time, based on the value corresponding to the difference value ΔF detected by said frequency difference detecting unit, and a compensation coefficient of aging, wherein: the compensation coefficient of aging is a ratio between an amount of change in the frequency of said first oscillation circuit and an amount of change in the frequency of said second oscillation circuit with respect to an elapse of operating time from the reference time; an output of said oscillation device is structured to be generated by utilizing an output of said first oscillation circuit; and a set value of the output frequency is structured to be compensated based on the frequency compensation value determined by said compensation value obtaining unit.