过去在暗室中使用普通裁片刀改裁胶片,往往因红灯亮度所限使操作不便,或由于视力不好,暗适应不够,致使胶片改裁有误。为提高工作效率,特自制出一种结构简单、安全可靠、使用方便、耗电省,在暗室条件下能清晰显示标尺的新型裁片刀。经使用效果较好,而且便于自制或改制。该装置结构(见附图) In the past, the use of ordinary cutting knife in the darkroom to change the film, often due to the brightness of the red light to make the operation inconvenient, or due to poor eyesight, dark adaptation is not enough, resulting in film rewinding error. In order to improve the work efficiency, we have made a new type of cutting knife that is simple in structure, safe and reliable, easy to use and power-saving, and can clearly display the ruler under darkroom conditions. The effect is better, but also easy to self-made or restructuring. The device structure (see attached drawings)