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1975-02-06 |
1977-07-12 |
Cts Corporation |
Acoustic transducer with a dual purpose piezoelectric element
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JPS5437135U
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*
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1977-08-18 |
1979-03-10 |
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JPS5825677Y2
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1978-04-07 |
1983-06-02 |
松下電器産業株式会社 |
圧電形スピ−カ
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GB2018548B
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1978-04-07 |
1982-06-16 |
Matsushita Electric Ind Co Ltd |
Piezoelectric speaker
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DE2831362A1
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1978-07-17 |
1980-01-31 |
Siemens Ag |
Elektroakustischer wandler
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1978-07-17 |
1980-01-31 |
Siemens Ag |
Elektroakustischer wandler
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JPS5911237B2
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1979-08-16 |
1984-03-14 |
株式会社精工舎 |
圧電スピ−カ
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1980-02-15 |
1984-08-30 |
Siemens AG, 1000 Berlin und 8000 München |
Wandlerplatte für piezoelektrische Wandler
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1980-08-11 |
1982-02-18 |
Inc Motorola |
Apparatus and method for enhancing the frequency response of a loudspeaker
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JPS6025956B2
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1980-12-10 |
1985-06-21 |
松下電器産業株式会社 |
超音波送受波器
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JPS5851697A
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1981-09-22 |
1983-03-26 |
Matsushita Electric Ind Co Ltd |
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1981-11-17 |
1986-08-19 |
Matsushita Electric Industrial Co. Ltd. |
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1981-12-08 |
1984-07-03 |
Matsushita Electric Industrial Co., Ltd. |
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1981-12-11 |
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Dual element headphone
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1982-04-19 |
1983-11-08 |
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1982-09-23 |
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Acoustic transducer with honeycomb diaphragm
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1983-02-26 |
1984-09-06 |
Rainer J. 5000 Köln Haas |
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1984-09-05 |
1986-04-23 |
Sawafuji Dynameca Co Ltd |
Piezoelectric vibrator
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1984-09-05 |
1986-06-13 |
Sawafuji Dynameca Co Ltd |
Elements piezoelectriques vibrants et transducteurs piezoelectriques electroacoustiques utilisant de tels elements
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1984-09-05 |
1986-06-13 |
Sawafuji Dynameca Co Ltd |
Elements piezoelectriques vibrants et transducteurs piezoelectriques electroacoustiques utilisant de tels elements
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1985-09-02 |
1993-03-09 |
Franco Tontini |
Multiple loudspeaker
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JPH0749914Y2
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1986-01-29 |
1995-11-13 |
株式会社村田製作所 |
超音波トランスデユ−サ
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1990-08-04 |
1992-02-06 |
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1994-05-02 |
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1994-05-11 |
1998-10-27 |
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1997-06-10 |
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1994-07-25 |
1995-08-22 |
Western Atlas International, Inc. |
Mechanically amplified piezoelectric acoustic transducer
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1995-05-23 |
1997-08-14 |
Silec Liaisons Elec |
Haut-parleur piezoelectrique
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1995-09-25 |
1999-05-04 |
Noise Cancellation Technologies, Inc. |
Piezo speaker for improved passenger cabin audio systems
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1998-11-04 |
Matsushita Electric Ind Co Ltd |
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1999-01-09 |
2001-01-30 |
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Piezo speaker for improved passenger cabin audio systems
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Composite acoustic absorber for ultrasound transducer backing material
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2004-10-29 |
2008-08-19 |
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Microphone with internal damping
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2008-07-14 |
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圧電発電装置
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2008-12-04 |
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株式会社村田製作所 |
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2012-08-10 |
2018-07-25 |
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2015-01-23 |
2016-07-28 |
Knowles Electronics, Llc |
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2016-06-07 |
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2017-10-20 |
주식회사 이엠텍 |
다공성 물질을 구비하는 마이크로스피커 인클로져
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