| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce power consumption by shortening a period in which electric power is supplied to an illuminance sensor when intermittently measuring ambient illuminance. <P>SOLUTION: An electronic apparatus includes: the illuminance sensor 1 which outputs a detection current corresponding to the ambient illuminance; a power supply unit 5 which intermittently supplies the electric power to the illuminance sensor 1; a current/voltage conversion circuit 7 which converts the detection current of the illuminance sensor 1 into a voltage signal; an ambient illuminance determination unit 9 which determines ambient illuminance based upon the voltage signal in a determination period as a constant period in the period of the power supply to the illuminance sensor 1; and a control unit 11 which changeably sets start time of the determination period for the start time of the period of the power supply, and sets end time of the period of the power supply to the same time as end time of the determination period corresponding to the set start time of the determination period or time which is a predetermined time after the end time. <P>COPYRIGHT: (C)2011,JPO&INPIT |
