PolyU IR Collection: AP Patents

Driver for an ultrasonic transducer and an ultrasonic transducer = 用于超声波换能器的驱动器以及超声波换能器

Wed, 14 Sep 2011 00:00:00 GMT

Title: Driver for an ultrasonic transducer and an ultrasonic transducer = 用于超声波换能器的驱动器以及超声波换能器

Authors: Or, Derek Siu-wing (柯少榮); Yung, Chung-sheung (容中尚); Chan, Helen L. W. (陳王麗華)

Abstract: An ultrasonic transducer driver has a giant magnetostrictive element, a fastener for holding the magnetostrictive element under mechanical pressure, a first field generator for providing a magnetic bias field, a second field generator for providing a magnetic drive field and a magnetic circuit for channelling the magnetic fields in the magnetostrictive element. An ultrasonic transducer for a bonding apparatus has a horn having a bonding tool at its smaller end and a mounting barrel adjoined onto it. The driver coupled to the larger end of the horn.; 一种超声波换能器驱动器，所述驱动器具有大磁致伸缩元件、用于在机械压力下保持大磁致伸缩元件的紧固件、用于提供偏磁场的第一磁场产生器、用于提供磁性驱动场的第二磁场产生器、以及用于在磁致伸缩元件中引导磁场通道的磁性回路。用于接合装置的超声波换能器具有：在较小端处具有接合工具的角状部以及邻接至其上的安装桶状部。所述驱动器连接到角状部的较大端。

Method and apparatus for measuring oscillation amplitude of an ultrasonic device

Tue, 26 Oct 2010 00:00:00 GMT

Title: Method and apparatus for measuring oscillation amplitude of an ultrasonic device

Authors: Chan, Helen L. W.; Lam, Tin-yan; Chao, Chen; Kwok, Kin-wing

Abstract: An apparatus and method for detecting the oscillation amplitude of a bonding tool includes a sensing unit disposed adjacent to and at a distance from the bonding tool. The sensing unit includes a pair of electrodes, a piezoelectric sensing layer located between the pair of electrodes, and a membrane associated with the piezoelectric sensing layer. The piezoelectric sensing layer becomes sensitive to ultrasonic vibrations and generates electrical voltage signals after being activated by a poling process. An optional pre-amplifier is used to amplify the signals generated from the sensing unit, and an oscilloscope is used to further process the signals.

Sodium potassium niobate barium zirconate titanate series lead-free piezoelectric ceramic composition = 铌酸钠钾锆钛酸钡系无铅压电陶瓷组合物

Wed, 25 Aug 2010 00:00:00 GMT

Title: Sodium potassium niobate barium zirconate titanate series lead-free piezoelectric ceramic composition = 铌酸钠钾锆钛酸钡系无铅压电陶瓷组合物

Authors: Lin, Dunmin (賃敦敏); Kwok, Kin-wing (郭建榮); Chan, Helen L. W. (陳王麗華)

Abstract: The present invention provides a novel potassium-sodium niobate zirconium barium titanate series leadless piezoelectric ceramic composition which comprises perovskite type piezoelectrics K<1-x>NaNbO3 and strong ferroelectrics Ba(Ti<1-y>Zr)O3, the general formula is represented by (1-z)(K<1-x>Na)NbO3-zBa(Ti<1-y>Zr)O3, in the formula 0Na)NbO3-zBa(Ti<1-y> Zr)O3((100-a)mol%+MO(amol%). The optimal value d33 of the system piezoelectric ceramic composition can up to above 230pC/N, kp can up to above 48%, and the kt can up to above 47%, has the advantages of good compactness, high Curie temperature, good thermal stability, being prepared with the conventional piezoelectric ceramic preparing technique and has practicability.; 一种新型的铌酸钠钾锆钛酸钡系无铅压电陶瓷组合物，其包含钙钛矿型压电体K1-xNaxNbO3和强铁电体Ba(Ti1-yZry)O3，其通式用(1-z)(K1-xNax)NbO3-zBa (Ti1-yZry)O3来表示，式中0＜x＜1，0＜y＜1，0＜z≤0.1。该无铅压电陶瓷组合物还可以含有一种或多种氧化物，其通式为(1-z)(K1-xNax)NbO3-zBa(Ti1-y Zry)O3((100-a)mol％)+MαOβ(amol％)。该体系压电陶瓷组合物的最优值d33可达230pC/N以上，kp可达48％以上，kt可达47％以上，致密性好，居里温度高，热稳定性好，采用传统压电陶瓷制备技术制得，具有实用性。

焊接工具

Wed, 21 Jan 2004 00:00:00 GMT

Title: 焊接工具

Authors: Chan, Helen L. W. (陳王麗華); Or, Derek Siu-wing (柯少榮); Choy, Chung-loong (蔡忠龍)

Abstract: 焊接工具具有激励器，其由在一个支架中的多个压电元件14组成。一个传感器定位并支持在该支架中，并且包括压电元件22，夹在电极21与隔离晶片23之间。电极21之间形成的电压被监视，并且在使用中用于确定焊接参数，参数包括每个超声猝发的振幅和周期。