Abstract: A multi purpose capacitive sensor which is suitable for indicating close proximity of a person to a surface along a large-size truck as well as along a medium-size painting. A voltage measuring device is provided with a signal ground connected to a first pole of an oscillating voltage source that has a second pole connected to earth and that is connected to an input of the voltage measuring device via a voltage divider with a capacitive series link arranged between the input and earth and a shunt link arranged between the input and the signal ground. The signal ground is connected to electrically conductive means extended along the surface and the oscillating voltage source is connected to earth via a second voltage divider in which a capacitive series link is arranged between the earth and the second pole.

Abstract: The present invention relates to a capacitive sensor system provided for a moving object 21.The system comprises an antenna device with a first 26 and a second portion 39 which are movable in relation to each other, the two portions 26,39 being connected in parallel for capacitive influence from the surroundings. The first portion 26 constitutes in an electrical conductive part of said moving object 21 and the second section 39 constitutes in an electrical conductive device arranged at a rest position for the moving object 21.

Abstract: A television system in which a telephone network is used for transmitting to a television receiver from a computer messages in the form of packets of information represented visually as pages. The television receiver is provided with control means for transmitting responses via the telephone network and for selecting a page, and the packets of information are stored by the computer in the form of information blocks each including a first information packet representing the message of a corresponding page and a second information packet representing data relating to the same page. The information blocks further include a third information packet to be received by the computer from a remote terminal via the telephone network and to instruct the computer to make such a transmittal that the data are represented visually at the television receiver as information added to the messages in a chosen subfield of the page.

Abstract: The present invention relates to a capacitive sensor system provided for a moving object 21. The system comprises an antenna device with a first 26 and a second portion 39 which are movable in relation to each other, the two portions 26,39 being connected in parallel for capacitive influence from the surroundings. The first portion 26 constitutes in an electrical conductive part of said moving object 21 and the second section 39 constitutes in an electrical conductive device arranged at a rest position for the moving object 21.

Abstract: An electric switch (1) comprising a capacity sensor circuit (2) provided with a signal input (3) arranged to be connected to an actuating line, and which is provided with a relay device (4) arranged to feed a current to a load line (7) from a power source (6) in response to a capacitive influence along said actuating line. According to the invention the signal input (3) of the sensor circuit (2) is arranged to be connected to the load line (7) in such a manner that the load line will constitute said actuating line.

Abstract: An electric switch (1) comprising a capacity sensor circuit (2) provided with a signal input (3) arranged to be connected to an actuating line, and which is provided with a relay device (4) arranged to feed a current to a load line (7) from a power source (6) in response to a capacitive influence along said actuating line. According to the invention the signal input (3) of the sensor circuit (2) is arranged to be connected to the load line (7) in such a manner that the load line will constitute said actuating line.