| 摘要 |
PURPOSE:To make a large-scale transmitting and receiving device unnecessary by executing an image pickup of an object whose dimensions are known by using a television camera provided with a motor-driven zoom lens, and controlling said motor-driven zoom lens so that a picture of the object has constant dimensions at all times. CONSTITUTION:A television camera 1 is provided with a motor-driven zoom lens 2, and a target A placed at a point of a front distance D of the television camera 1 is brought to an image pickup through the zoom lens 2. Also, the zoom lens 2 is provided with a sensor for detecting its operating quantity, and a signal being proportional to the operating quantity of the zoom lens 2 is sent out to a range finding and operating part 7 from this sensor. According to such a constitution, the motor-driven zoom lens can be controlled so that a picture of an object has constant dimensions at all times, and a large-scale transmitting and receiving device becomes unnecessary.
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