论文部分内容阅读
现在暗室里一般使用的曝光定时器存在两个方面的缺陷:(1)没有调光装置,光的照度不能根据需要而改变.(2)没有时间显示装置,操作人视力不太好的情况下,只能凭经验确定定时旋钮的位置.这也就很难避免出现定时错误.为了克服以上缺陷,更方便幻灯片的制作和照片的印放,我们设计出了一台使用方便、灵活,性能可靠的曝光定时器.它具有以下几个特点:1)可根据需要调整光的照度,适应各种底片制作幻灯片和照片的印放;2)具有时间显示,能准确定时曝光,使用方便;3)输出功率大,性能可靠;4)造价很低,适应经费不足的学校自己安装.
There are two defects in the exposure timer generally used in the darkroom: (1) There is no dimming device, and the illuminance of the light can not be changed as needed. (2) Without the time display device, the operator has poor eyesight , Only by experience to determine the timing knob position.This is difficult to avoid timing errors.To overcome these shortcomings, more convenient slide production and photo printing, we have designed a convenient, flexible, performance Reliable exposure timer.It has the following features: 1) According to the need to adjust the light illumination, adapt to a variety of film production slides and photo prints; 2) with time display, accurate timing exposure, easy to use; 3) output power, reliable performance; 4) low cost, to adapt to the lack of funding for the school to install.