自动曝光的数学模型及其机构

A Mathematical Model and Structure for Automatic Exposure

为了实现准确自动曝光,运用电磁学和光学的基本原理,结合感光材料和硫化镉光敏电阻的特性,建构了曝光时间与像照度之间的数学模型,并据此模型与电子电路、机械机构相配合,实现了自动曝光。对自动曝光系统的设计和维修有一定的参考价值。

In order to carry out accurate automatic exposure, combining with the characteristics of the sensitized material and CdS light-sensitive resistors, a mathematical model between exposure time and image luminous density is established by applying the basic principle of electromagnetism and optics. Automatic exposure has been carried out on the basis of the model and the coordination between the electronic circuit and mechanism. The paper has some reference value for the design and maintenance of automatic exposure system.