Thermostatic oven type electronic instrument

Abstract

To provide an oven controlled crystal oscillator which can keep constant the temperature of a quartz resonator housed within a thermostatic oven, thereby ensuring stable operation of the quartz resonator. An oven controlled crystal oscillator has a control system for exercising control so that the temperature of a quartz resonator becomes a target temperature Ttarg of a predetermined fixed value. The quartz resonator is housed within a thermostatic oven which is configured to compare a set temperature Tr and a measured temperature Tic based on an outside air temperature measured by a temperature sensor and which is controlled so that a difference between both temperatures is narrowed. The quartz resonator has characteristics influenced by an environmental temperature. The control system adds a predetermined feedback amount δT to the target temperature Ttarg of the fixed value to generate a new set temperature Tr for comparison with the measured temperature Tic so that when the measured temperature Tic lowers, the set temperature Tr becomes high, or when the measured temperature Tic rises, the set temperature Tr becomes low.

Dependencies are inferred from the claim text.