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    • 6. 发明授权
    • Method and apparatus for generating piezoelectric transducer excitation waveforms using a boost converter
    • 使用升压转换器产生压电换能器激励波形的方法和装置
    • US09369127B1
    • 2016-06-14
    • US14481562
    • 2014-09-09
    • Maxim Integrated Products, Inc.
    • Paul NicksonArshad Suhail FarooquiLee ColemanMuhammad UmairRoberto Alini
    • G06F3/00H03K17/96H02M3/335G06F3/01
    • H03K17/964G06F3/016G06F3/041H02M3/33507
    • Transducers formed as part of a touchscreen system emulate the motion of a pushbutton or other mechanical elements. A touchscreen system positions a transducer adjacent to an icon displayed on the touchscreen surface. When a user touches the icon, the transducer senses the touch and is then deformed in a pattern that emulates a mechanical motion, giving the user the sensation of touching a mechanical button. An excitation signal applied to the transducer is compared to a target excitation signal that, when applied to the transducer, causes the transducer to emulate the desired motion. When any differences between the two signals are detected, the excitation signal is adjusted so that the motion is corrected. The target excitation signal, or time and voltage segments defining it, are stored in memory and retrieved for comparison. The excitation signal is also selected to reduce any acoustic artifacts that can cause the transducer to generate audible clicks.
    • 作为触摸屏系统的一部分形成的传感器模拟按钮或其他机械元件的运动。 触摸屏系统将传感器定位在触摸屏表面上显示的图标附近。 当用户触摸图标时,换能器感测触摸,然后以模拟机械运动的图案变形,给予用户触摸机械按钮的感觉。 将施加到换能器的激励信号与目标激励信号进行比较,当施加到换能器时,其使得换能器模拟期望的运动。 当检测到两个信号之间的任何差异时,调整激励信号以使运动被校正。 目标激励信号或定义它的时间和电压段被存储在存储器中并且被检索用于比较。 还选择激励信号以减少可能导致换能器产生可听见的咔嗒声的任何声学伪影。
    • 7. 发明申请
    • TRANSMIT/RECEIVE SYSTEMS FOR IMAGING DEVICES
    • 用于成像装置的发送/接收系统
    • US20140347955A1
    • 2014-11-27
    • US14456546
    • 2014-08-11
    • Maxim Integrated Products, Inc.
    • Luigi FranchiniRoberto AliniFilippo Cevini
    • G01S7/52
    • G01S7/52017A61B8/56A61B8/587G01S7/52004G01S7/52025G01S15/8906
    • A transmit circuit outputs test pulses to a probe including a transducer to generate an image of a test object. A composite signal including the test pulses and a reflected signal is output by the transducer. A receive circuit receives the composite signal including the test pulses and the reflected signal and includes a filter circuit that filters the test pulses from the composite signal and passes the reflected signal. An impedance of the filter circuit is equal to substantially zero when the reflected signal is within a predetermined frequency range. A clipper circuit limits a magnitude of an output of the filter circuit. An amplifier amplifies the output of the filter circuit and that outputs an amplified voltage. A processing module generates a signal for displaying the image of the test object based on the amplified voltage.
    • 发射电路将测试脉冲输出到包括换能器的探针以产生测试对象的图像。 包括测试脉冲和反射信号的复合信号由换能器输出。 接收电路接收包括测试脉冲和反射信号的复合信号,并且包括滤波电路,其从复合信号中滤出测试脉冲并传递反射信号。 当反射信号在预定频率范围内时,滤波电路的阻抗基本上等于零。 限幅电路限制了滤波器电路的输出的幅度。 放大器放大滤波器电路的输出并输出放大的电压。 处理模块基于放大的电压产生用于显示测试对象的图像的信号。