| 摘要 |
<p>A method and apparatus for killing insects, particularly insects which fly, comprising electrodes (17, 18), between which an electric voltage field is created. The invention also comprises an attractant (19) by which insects are enticed to pass into said field. The voltage field created is of such magnitude that when insects fly through said field a spark is formed between said electrodes may have the form of a multiplicity of wires or rods arranged in mutual, uniform spaced relationship, adjacent electrodes being connectable to opposite poles of a high voltage source (11). The invention further comprises an electronic control means including a detector (2) which is arranged to detect power or energy fluctuations in the voltage field as a result of objects, such as insects, entering said field. A switch (6) is controlled by said control means to automatically interrupt the supply of power to the electrodes when a certain maximum power is reached or exceeded. This interruption in power supply is maintained over a predetermined time with the aid of electronic means (3, 4, 5). These latter means may be operable in respect of short circuits and spark-formations between the electrodes which are of a longer period of time than a given period, and are able to determine the time lapse before the power is re-connected. It is possible in this way to limit the amount of thermal energy which can be accumulated in an insect, a piece of straw or some other object which may have fastened to the electrodes, to a value of such low magnitude that the object in question is unable to glow to burning heat or to ignite. In this way the risk of such an invention being the cause of a fire in the vicinity where it is placed is reduced to a minimum. </p> |
