| 摘要 |
<p>1,020,840. Automatic speed control. PENTACON DRESDEN KAMERA-UND KINOWERKE VEB. May 7, 1964, No. 19032/64. Heading G3R. A camera is driven by an electric motor 1 which is connected in series with transistor 2, the camera being synchronized with magnetic sound apparatus by means of vibratory switches 20, 21, shunted by capacitors 18,19 and actuated by the sound apparatus and the camera respectively. The duration of pulses applied to the base of transistor 11 is dependent upon the relative rates of operation of the switches 20, 21, the transistor 2 being controlled by the transistor 11. During the starting period of the motor 1, switch 15 is opened so that capacitor 15 is charged to render the transistor 11 non-conductive for continuous energization of the motor. The speed of the camera motor is stabilized by transistor 3 forming a variable impedance between the emitter and base of transistor 2, and controlled by a motor-driven generator 5 through rectifier 4.</p> |
