Electronic instrument

摘要

An electronic instrument capable of preventing an erroneous operation just after start of power supply is provided, even in the case where a power source voltage is not quickly raised. Electric power generated by a thermoelectric conversion element (102) is stored in a secondary battery (105) through a boosting circuit (103) and a countercurrent preventing diode (104). At the same time, power supply starts for a control circuit (106) and an electronic instrument main body circuit (107). With the increase of the power source voltage, the control circuit (106) having a low threshold voltage starts to operate and outputs a control signal to stop operation of the electronic instrument main body circuit (107). When the power source voltage is further increased up to a voltage at which the electronic instrument main body circuit (107) can normally operate, the control circuit (106) effects control so that the electronic instrument main body circuit (107) is operated.