JPS55163999A - Electro-acoustic converting element - Google Patents

Electro-acoustic converting element

Info

Publication number
JPS55163999A
JPS55163999A JP7118979A JP7118979A JPS55163999A JP S55163999 A JPS55163999 A JP S55163999A JP 7118979 A JP7118979 A JP 7118979A JP 7118979 A JP7118979 A JP 7118979A JP S55163999 A JPS55163999 A JP S55163999A
Authority
JP
Japan
Prior art keywords
back surface
piezoelectric film
additional layer
acoustic
polymer piezoelectric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7118979A
Other languages
Japanese (ja)
Inventor
Koji Daito
Toshiharu Nakanishi
Miyo Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toray Industries Inc
Original Assignee
Toray Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toray Industries Inc filed Critical Toray Industries Inc
Priority to JP7118979A priority Critical patent/JPS55163999A/en
Publication of JPS55163999A publication Critical patent/JPS55163999A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer

Abstract

PURPOSE:To reduce a conversion loss by lessening radiation of an acoustic wave to the back surface of a polymer piezoelectric film, by providing a fixed additional layer on the back surface. CONSTITUTION:On the opposite surface to the side of the acoustic operation side of polymer piezoelectric film 11, namely, the back surface, fixed additional layer 12 is provided. This additional layer 12 is made of a material having many small pores evenly and its acoustic impedance is set smaller than that of polymer piezoelectric film 11. Further, additional layer 12 is provided to piezoelectric film 11 directly or via electrode 13 indirectly. As a result, leakage of an acoustic wave to the back surface can be prevented and a conversion loss can also be lessened.
JP7118979A 1979-06-08 1979-06-08 Electro-acoustic converting element Pending JPS55163999A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7118979A JPS55163999A (en) 1979-06-08 1979-06-08 Electro-acoustic converting element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7118979A JPS55163999A (en) 1979-06-08 1979-06-08 Electro-acoustic converting element

Publications (1)

Publication Number Publication Date
JPS55163999A true JPS55163999A (en) 1980-12-20

Family

ID=13453455

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7118979A Pending JPS55163999A (en) 1979-06-08 1979-06-08 Electro-acoustic converting element

Country Status (1)

Country Link
JP (1) JPS55163999A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549107A (en) * 1982-09-28 1985-10-22 Tokyo Shibaura Denki Kabushiki Kaisha Ultrasonic beam focusing device with a concave surface

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549107A (en) * 1982-09-28 1985-10-22 Tokyo Shibaura Denki Kabushiki Kaisha Ultrasonic beam focusing device with a concave surface

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