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随着电子技术的发展以及自动化的广泛应用,为获得质量好的电视图象并减轻调象人员的负担,近几年来,电视摄象机上采用了自动光圈控制系统。我们结合国产彩色电视摄象机的特点,改进了光圈控制部分,实现了光圈自动控制。本文重点介绍摄象机自动光圈控制系统跟踪部分的改进情况,并对其比较放大器、场效应开关电路以及积分放大器等电路原理及调机步骤作一些介绍和分析。
With the development of electronic technology and the widespread use of automation, in order to obtain good quality television images and reduce the burden on imagers, automatic aperture control systems have been adopted on television cameras in recent years. We combine the characteristics of domestic color TV cameras, improved aperture control section, to achieve the aperture automatic control. This article focuses on the improvement of the tracking part of the camera’s auto iris control system, and introduces and analyzes the circuit principle and adjusting procedure of the comparison amplifier, the field effect switching circuit and the integrating amplifier.