Patent ID: 7165454
Filing Date: 2007-01-23
Classification: G01H,G10K

Abstract:
1. An ultrasonic sensor unit, comprising: an ultrasonic sensor, a case for containing the ultrasonic sensor, the case having a horn protruding from an inner side of a bottom of the case and having a tapered opening having a diameter gradually increased toward the outside of the case, to expose an a sending element and a receiving element of the ultrasonic sensor to an outside of the case, and a sheet component arranged on the inner side of the bottom of the case to cover the bottom and surround the horn, and having a hot-wire heater buried in or mounted on its part covering the bottom and its part surrounding the horn, wherein said hot-wire heater surrounding the horn is wound around the horn a plurality of times so that the pitch between the turns of the hot-wire heater is smaller on a part near the open end of the horn and/or a hot wire of said hot-wire heater surrounding the horn is formed thicker or wider on the part near the open end of the horn.