| 摘要 |
<p>A display is connected to a computer and will show the data put on the screen by the operator. When the operator for any reason leaves the display, the data will be open to public inspection, thereby making it possible for unauthorized persons to pry into other people's privacy. To this end, the present invention suggests a personal access control system for operators of a display connected to a computer comprising: (1) A control box situated between the computer and the display, where the control box, having at least a receiver, a decoder logic, a memory, and an ON/OFF-logic, frequently receive signals for maintaining the connection between computer and display, these signals being generated by (2) A key or ID module being placed on or in the vicinity of an operator, having a circuitry being able to prepare a signal and transmit the signal together with the operator's ID code to the control box, where in the receiver (3) A threshold circuit supervising the amplitude of the signal comparing the amplitude of the signal to a predetermined minimum value and triggering the (ON)/OFF-logic circuitry for the display, if the signal amplitude is below the predetermined value, until the operator or another authorized operator approaches the display with his signals, whereby the threshold circuit reactivates the ON/(OFF)-logic circuit for the display.</p> |
