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US 10,307,792 B2Granted
Ultrasonic transducer, ultrasonic finger recognition sensor and electronic device
AssigneeNanchang O-Film Bio-Identification Technology Co., Ltd.
InventorsAnpeng Bai, Wensi Sun
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Abstract
The present disclosure discloses an ultrasonic transducer. The ultrasonic transducer includes an active layer. The active layer includes an array of piezoelectric pillars configured for emitting and receiving ultrasound and an attenuation portion surrounding sidewalls of the piezoelectric pillars and configured for attenuating a part of the ultrasound emitted from the sidewalls of the piezoelectric pillars. The present disclosure also relates to an ultrasonic fingerprint recognition sensor and an electronic device having the ultrasonic transducer.
Claims20
An ultrasonic transducer comprising:
- an active layer comprising:
- an array of piezoelectric pillars configured for emitting and receiving ultrasound;
- and
- an attenuation portion surrounding sidewalls of the piezoelectric pillars and configured for attenuating a part of the ultrasound emitted from the sidewalls of the piezoelectric pillars;
- wherein the attenuation portion is made of a material with an acoustic impedance substantially lower than about 4.53 M Rayls.
2 more elements
Dependencies are inferred from the claim text.