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.