ELECTROMAGNETIC-TYPE ULTRASONIC SENSOR CAPABLE OF IMPROVING NOISE SHIELDING FUNCTION

摘要

PURPOSE: An electromagnetic-type ultrasonic sensor is provided to improve sensitivity of the electromagnetic-type ultrasonic sensor by preventing noise from being introduced into the electromagnetic-type ultrasonic sensor from a strip. CONSTITUTION: An electromagnetic-type ultrasonic sensor includes an ultrasonic wave generating section and an ultrasonic wave receiving section. The ultrasonic wave receiving section has a magnet(51) accommodated in a sensor case so as to form a bias field according to an AC signal transmitted thereto and a probe(52). The probe(52) includes a ferrite core(52a) for forming a dynamic field, which is vertically crossing the bias field, and a coil(52b) wound around the ferrite core(52a). The probe(52) is surrounded by an outer noise shielding film(53). A strip noise shielding film(54) is formed at a lower portion of the outer noise shielding film(53).