| 摘要 |
A personal electronic insect repelling device is. An electronic circuit supported to the underside of a brim of a hat produces a sonic signal directed towards the body of a person wearing the hat. The sonic signal has a frequency which repels insects, particularly mosquitoes. The sonic signal is generated by a battery operated oscillator circuit, which drives an electro acoustic transducer for generating the sonic signal. The acoustic transducer is mounted with respect to the hat brim so that substantially all exposed areas of the person wearing the hat are radiated with sonic energy. The sonic signal has essentially the same characteristics as the sound of a male mosquito. The device may advantageously include an indicator to indicate the status of the battery. In this way, the consequences of frequency drift due to low battery voltage can be readily ascertained, and battery replacement effected at the appropriate time.
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