专利名称：Device for frightening noxious animals by
emitting ultrasonic signals
发明人：LANG, OLIVER申请号：EP95250009.8申请日：19950118公开号：EP0664079A1公开日：19950726
专利附图：
摘要：The system is controlled by a CPU to generate preset patterns of signal withcharacteristic signal length, group-lengths and shapes to drive a piezo-electric
transducer (20) at programmed US sound patterns. The patterns are varied to apply to
different pests and to suit the conditions e.g. different parts of the breeding year. Thesignal characteristics are produced by a programmed control (14) and are changed to ananalogue pattern by the CPU. This is used to drive the piezo output stage via a fast op-amp (15) and a frequency filter (19). Two parallel piezo-electric transducers are used setat an angle of 20 degrees to each other. The circular piezo wafers are provided withcones of waterproof, oxide coated paper with oval openings. The system has anautomatic reset on failure of the power supply.
申请人：LANG, OLIVER,LANG, KAREN M.,LANG, KAREN M.
地址：Nollendorfstrasse 26 D-10777 Berlin DE,1 rue de Vénus F-94700 Maisons AlfortFR
国籍：DE,FR
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