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自从四十多年前硒光电池用于照相机之后,传统的机械动作照相机就逐渐发展成用集成电路进行自动控制的自动曝光照相机.半导体器件和精密机械的结合,促使照相机的性能不断提高.自动曝光照相机早在六十年代就已问世.目前,全世界年产照相机几千万架,大多数都带有曝光表,电子快门、“电眼”和自动控制机构.我国新型的珠江S-203型单镜头自动曝光照相机也已有商品出售.一、几种光电探测器的性能比较照相机的自动曝光可以从三种途径获得.第一、控制快门(电子快门);第二,控制光圈(“电眼”);第三,快门,光圈同时程序控制.控制快门速度时,在一定的光圈下,光电探测器受到从被摄物反射而来的光的激励,产生光电流,经高输入阻抗场效应晶体管等组成的控制线路,控制电动快门的速度,实现照相机曝光的自
Since selenium cells were used in cameras for more than four decades, traditional mechanical motion cameras have evolved into automatic exposure cameras that are automatically controlled by integrated circuits. The combination of semiconductor devices and precision machinery has led to ever-increasing camera performance. Cameras have been available since the 1960s, with tens of millions of cameras produced annually in the world, most of them with exposure meters, electronic shutters, electric eyes and automatic control mechanisms. The new Pearl River Delta S-203 First, the control shutter (electronic shutter); second, the control aperture (), the control of the aperture “Eye”); Third, the shutter, the aperture at the same time program control. Control the shutter speed, at a certain aperture, the photodetector by the reflected light from the object excitation, resulting in photocurrent, high input Impedance field effect transistors and other components of the control circuit to control the speed of electric shutter to achieve the camera exposure from