Abstract: The picture transmission system is used in a monitoring system etc., and which transmits picture information obtained through video camera unit and sound information from a microphone, speaker or such via networks. The picture transmission system is composed of a video camera unit selected to meet the intended purpose in combination with a common picture transmission unit, which compresses the output signal from the video camera unit according to a prescribed coding format and transmits it to network etc. according to a prescribed protocol at a prescribed transmission rate.

Abstract: A semiconductor electrostatic device for producing an output electrostatic force includes an active element, an opposed field element and a control element. The active element has a semiconductor region containing carriers movable in response to an applied electrostatic field only when the field exceeds a predetermined threshold level. The field element generates the electrostatic field and applies the field to the semiconductor region of the active element. A control element controls the electrostatic field to selectively exceed the threshold level so as to localize the carriers within the semiconductor region to thereby generate an output electrostatic force. The device may be configured to output a useful electrostatic force exceeding the inverse of the squared value of the distance between the active element and the field element.