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1. 发明专利

JP2004138435A Ultrasonic flowmeter and transducer 有权
公开(公告)号：JP2004138435A
公开(公告)日：2004-05-13
申请号：JP2002301767
申请日：2002-10-16
申请人： Aichi Tokei Denki Co Ltd , Murata Mfg Co Ltd , 愛知時計電機株式会社 , 株式会社村田製作所
发明人： TANAKA YUTAKA , OGITA AKIO
IPC分类号： G01F1/66 , H04R17/00
CPC分类号： G01F1/667
摘要： PROBLEM TO BE SOLVED: To improve a flow rate measurement precision by reducing the detection errors of the zero cross point of reception waves by 1.5 reciprocating noise entering a transducer at a reception side by 1.5 reciprocation between facing transducers after reflection on the transducer two times. SOLUTION: The transducer at the transmission side is arranged on an extension line at a left side in a figure in a center axis X-X in the transducer 18 at a reception side. Ultrasonic pulses from the transducer at the unillustrated transmission side enter a reflection surface 7b made of a conical inclination surface in front of an acoustic matching layer 7A in the transducer 18 for reflection as shown by arrows A', B' when entering as shown by arrows A, B, and change the directions deviating from the center axis X-X. Therefore the reflection waves A', B' do not enter the opposing transmission side transducer, and do not become 1.5 reciprocating noise. Ultrasonic waves entering as shown in arrows C, D change the direction with a larger angle, become directions C', D', and do not become 1.5 reciprocating noise. COPYRIGHT: (C)2004,JPO

2. 发明专利

JP2005130389A Acoustic matching layer 有权
标题翻译：声乐匹配层
公开(公告)号：JP2005130389A
公开(公告)日：2005-05-19
申请号：JP2003366231
申请日：2003-10-27
申请人： Murata Mfg Co Ltd , 株式会社村田製作所
发明人： OGITA AKIO
IPC分类号： G01N29/24 , H04R17/00
摘要： PROBLEM TO BE SOLVED: To provide an acoustic matching layer that has lower acoustic impedance by further increasing the mixing quantity of hollow glass balloon grains, and an ultrasonic sensor using the acoustic matching layer.
SOLUTION: A trace amount of carbon grains 3 having a small grain size are mixed and dispersed in a resin in addition to hollow glass balloon grains 2. At such a time, the D90 grain size of carbon grains 3 becomes 1/10 or less of the D10 grain size of hollow glass balloon grains 2. Thus, a trace amount of the carbon grains 3 operate as a bearing between the hollow glass balloon grains 2 and the viscosity of the resin before thermosetting is lowered to facilitate stirring, so that the mixing quantity of hollow glass balloon grains 2 is increased to realize the lower acoustic impedance.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：通过进一步增加中空玻璃球囊颗粒的混合量和使用声匹配层的超声波传感器来提供具有较低声阻抗的声匹配层。解决方案：除了中空玻璃球囊颗粒2之外，将微量的具有小粒径的碳颗粒3混合并分散在树脂中。此时，碳颗粒3的D90晶粒尺寸变为1/10 中空玻璃气球颗粒2的D10晶粒尺寸以下。因此，微量的碳粒3作为中空玻璃球状颗粒2之间的轴承和热固性树脂的粘度降低以促进搅拌而起作用，因此中空玻璃气球颗粒2的混合量增加以实现较低的声阻抗。版权所有（C）2005，JPO＆NCIPI

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