| 摘要 |
PURPOSE:To photograph a picture having a good quality unless simultaneous sound recording is executed, by automatically selecting an optimum loop control mode in accordance with a set state of a photographing mode. CONSTITUTION:Rotation speeds of a film feed pawl driving motor M1 and a capstan driving motor M2 are prescribed by controlling circuits 2, 2'. When a rotation speed of M1 is prescribed to 18 frames/second, switches SWca, SWcb are set to an A mode, and M1 exceeds a speed corresponding to 20 frames/ second by voltage generated by a tachogenerator G1; feed to M1 is cut off, a film loop proceeds in the increasing direction, and also, when the film loop exceeds a proper loop extent range, a speed of M1 is prescribed to a speed corresponding to 16 frames/second, and the film loop proceeds in the decreasing direction. On the other hand, SWca and SWcb are set to a B mode, a speed of M1 is set to 18 frame/second, and M2 is loop-controlled by a loop sensor switch SWlb. |
