ULTRASONIC TRANSDUCER

• Main Authors: KONO MITSUHARU, ARAMAKI MASAAKI
• Format: Patent
• Language: English; Japanese
• Published: 07.09.2023
• Subjects: DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; PUBLIC ADDRESS SYSTEMS

To provide an ultrasonic transducer capable of improving reception sensitivity.SOLUTION: An ultrasonic transducer includes: a substrate 10; a piezoelectric layer 12 provided on the substrate and having a first main surface located on the substrate side, and a second main surface; a first transmitting electrode 14a provided on the first main surface and a second transmitting electrode 14b provided on the second main surface, sandwiching the center portion of the piezoelectric layer; a first receiving electrode 16a and a second receiving electrode 16b provided on the second main surface of the piezoelectric layer, adjacent to each other and spaced apart from each other, surrounding the second transmitting electrode; a transmitting unit 24 that transmits ultrasonic waves by applying an alternating current voltage between the first transmitting electrode and the second transmitting electrode; and a detection unit 22 that detects ultrasonic waves by an alternating current voltage generated between the first receiving electrode and the second receiving electrode.SELECTED DRAWING: Figure 1 【課題】受信感度を向上させることが可能な超音波トランスデューサを提供する。【解決手段】超音波トランスデューサは、基板１０と、基板上に設けられ、前記基板側に位置する第１主面と、第２主面と、を有する圧電層１２と、前記圧電層の中央部を挟み、前記第１主面に設けられる第１送信電極１４ａおよび前記第２主面に設けられる第２送信電極１４ｂと、前記圧電層の前記第２主面に、互いに隣接し、かつ離間して、前記第２送信電極を囲んで設けられる第１受信電極１６ａおよび第２受信電極１６ｂと、前記第１送信電極と前記第２送信電極との間に交流電圧を印加することで、超音波を送信する送信部２４と、前記第１受信電極と前記第２受信電極との間に生じる交流電圧により超音波を検出する検出部２２とを備える。【選択図】図１