| 摘要 |
The apparatus controls the exposure time in the camera according to the intensity of the ambient light. The apparatus comprises: an optical element part(10) varying the time, necessary to reach a maximum voltage, according to the intensity of the ambient light; voltage division circuits(R1,R2,R3) generating two stage voltage; a differential amplifier(20) differentially amplifying the output of the optical element part(10) and a 1st output voltage of the voltage division circuit; an oscillation controller(30) increasing the output of the optical element part(10) if the output of the optical element part(10) is lower than the 1st output voltage, and otherwise, decreasing the output of the optical element part(10); a counter(40) counting the output of the oscillation controller(30). |
