| 摘要 |
PURPOSE:To exercise stable speed control by making a comparison among the output of a build-up adjusting circuit, a speed feedback signal obtained by a speed generator, and a reference voltage signal and by controlling a motor current on the basis of the result of the comparison. CONSTITUTION:The output of a reference voltage source 2 connected to a power source 1 is supplied to a comparing circuit 3 and also supplied to the other input of the comparing circuit 3 by way of a build-up adjusting circuit 7 for rising control. This comparing circuit 3 is further supplied with a speed feedback signal from a speed generator TG via a filter voltage-dividing circuit 6. Consequently, the comparing circuit 3 performs control operation on the basis of those three inputs and supplies its output to a control circuit 5 to drive and control a motor M which is the driving source of a camera. If the speed varies, speed feedback is provided via the generator TG for constant-speed control. Thus, the speed control is exercised stably. |
