对高速摄影供片阻尼实现方法的改进

棱镜补偿式高速摄影机供片阻尼的实现是摄影机调试时必须要解决而又难解决的一个问题,尤其是在高速大片盘时由于惯性的原因往往出现胶片"前冲"堆片现象.传统的供片阻尼装置是一电磁离合器加摩擦阻尼器的复合机构,手工调节多头螺纹来实现不同拍摄频率下的阻尼.通过对摄影机供片特性的定量分析,给出了一种改进的供片阻尼实现方法,该方法用电磁离合器取代原来的电磁离合器加摩擦阻尼器的复合机构来实现供片阻尼,通过单片机控制调节流过电磁离合器线圈的电流,从而改变供片阻尼的大小,简化了结构,方便了摄影机调节,实际的工程应用证明该方法是行之有效的.

New method for realizing the film-supplying characteristic of a high-speed camera

The realization of the film-supplying disc's damped torsion of a prism compensation high-speed camera is one hard-to-solve problem when the camera adjusted, especially when the speed is high and the film long, because of the inertial, the film-supplying disc's rush for ward leads to film crushing up. The traditional damped torsion-supplying device is composed of both a mechanical friction damper and an electromagnetic clutch, manually adjusting a multi-screw thread to get different damped torsion at different speed. Qualitatively analyzing the film-supplying characteristic of the camera in derail, a new method for realizing the film-supplying disc's damped torsion is presented, in which a program controllable electromagnetic clutch is used to replace the former device to fulfill the damped torsion, and a single-chip computer is used to control the electric current of the electromagnetic clutch's coil, so that the damped torsion is changed. By this method, the device is simplified and makes the adjusting of the camera easier. The practical use shows this method is effective and valid.