公开(公告)号：US4617503A

公开(公告)日：1986-10-14

申请号：US801823

申请日：1985-11-26

申请人： Richard K. Davis ,  Clayton R. Roberts ,  Stephen W. Tehon

发明人： Richard K. Davis ,  Clayton R. Roberts ,  Stephen W. Tehon

IPC分类号： B23Q17/22 ,  G05B19/18 ,  G05B19/401 ,  G05B19/404 ,  G05B19/24

CPC分类号： G05B19/4015

摘要： A datum is disclosed for use as a coordinate reference in a numerically controlled machine tool. The datum which is active, consists of an elongated member, typically one half wavelength in length, supported at its center (and antinode) by a plate, and including electromechanical transducers for exciting resonance in a desired fundamental longitudinal mode. The datum is operated by an operational amplifier having the transducers connected in the amplifier feedback path. Assurance against the excitation of undesired modes is achieved by limiting the gain of the operational amplifier throughout the response band of the transducers, by use of an inductor for resonating the input capacitance of the driving transducer at the frequency of the desired mode and by gain bandwidth limits of the operational amplifier. The datum is active at an ultrasonic frequency suited to touch sensing and thus produces a response in a touch sensing system when the cutter is touched to the datum. The response provides an accurate indication of the cutter position referenced to the coordinate system of the machine tool as well as a test signal for a system test calibration.

摘要翻译： 公开了用于数控机床中的坐标参考的基准。 有源的基准由细长的构件组成，通常长度为一半的波长，由板支撑在其中心（和波腹）处，并且包括用于以期望的基本纵向模式激发谐振的机电换能器。 数据由具有连接在放大器反馈路径中的换能器的运算放大器来操作。 通过使用用于在所需模式的频率下谐振驱动换能器的输入电容的电感器和增益带宽来实现通过限制运算放大器在换能器的整个响应带中的增益的保证 运算放大器的极限。 该数据以适合于触摸感测的超声波频率起作用，并且因此当切割器被触摸到基准时在触摸感测系统中产生响应。 响应提供了参考机床坐标系的刀具位置的精确指示以及用于系统测试校准的测试信号。

公开(公告)号：US4661997A

公开(公告)日：1987-04-28

申请号：US779139

申请日：1985-09-23

申请人： Clayton R. Roberts ,  Stephen J. Nightingale

发明人： Clayton R. Roberts ,  Stephen J. Nightingale

IPC分类号： H03D7/14 ,  H03D9/06 ,  H04B1/26

CPC分类号： H03D9/0641 ,  H03D2200/0017 ,  H03D2200/0023 ,  H03D7/1408 ,  H03D9/0616 ,  H03D9/0633

摘要： A novel mixer of good noise performance for operation at microwave frequencies (e.g. the 22 GHz communications band) is disclosed. The mixer comprises a waveguide to which signals and local oscillations are coupled, and from which the intermediate frequency output is derived. The principal circuitry is provided on a metallized substrate set within the waveguide in a "finline" construction. The metallized substrate performs the essential functions of impedance matching the mixer to the source of signal and local oscillations, a bridge for isolating the signal port from local oscillations and for isolating the LO port from the signal, and means to adjust the application of signal and load to the mixer diodes for optimum signal conversion. The noise figure achieved is approximately 4 db at 22 GHz, and represents an improvement over known competitive designs.

摘要翻译： 公开了一种用于在微波频率（例如，22GHz通信频带）下操作的良好噪声性能的新型混频器。 混频器包括波导，信号和本地振荡耦合到该波导，从中导出中频输出。 主要电路以“finline”结构设置在波导管内的金属化衬底上。 金属化基板执行将混频器与信号源和本地振荡源的阻抗匹配的基本功能，用于将信号端口与本地振荡隔离并将LO端口与信号隔离的桥接器，以及用于调整信号和 加载到混频器二极管以实现最佳信号转换。 实现的噪声系数在22 GHz时约为4 dB，相当于已知的竞争设计。

公开(公告)号：US4418429A

公开(公告)日：1983-11-29

申请号：US375816

申请日：1982-05-07

申请人： Clayton R. Roberts

发明人： Clayton R. Roberts

IPC分类号： H01Q1/24 ,  H03D7/14 ,  H03D9/06 ,  H04B1/26

CPC分类号： H01Q1/247 ,  H03D9/0641 ,  H03D2200/0017 ,  H03D7/1408 ,  H03D9/0633

摘要： The present invention relates to a mixer for use at high microwave frequencies (typically 21.8.times.23.2 GHz) in a low cost communications application. The invention utilizes low cost microwave components, including a low cost compartmented waveguide, shared by the signal and local oscillator and extensive microstrip circuitry. The provision of a pair of novel 1/4 wave impedance transformers coupled into the waveguide compartments provides efficient antenna and local oscillator input filtering, and efficient coupling from the waveguide sections to the microstrip circuitry. The mixer operation is carried out in the microstrip circuitry, which contains a hybrid coupler, a balanced diode detector, and the required mixer output filter. The arrangement is of low cost, and provides a low noise figure (7 db including the preamplifier), good band selectivity (15 db return loss over the communications band), and low local oscillator radiation.

摘要翻译： 本发明涉及在低成本通信应用中用于高微波频率（通常为21.8×23.2GHz）的混频器。 本发明利用低成本的微波元件，包括由信号和本地振荡器共享的低成本隔间波导和广泛的微带线路。 提供耦合到波导隔间中的一对新颖的1/4波阻抗变压器提供有效的天线和本地振荡器输入滤波，以及从波导段到微带线路的有效耦合。 混频器操作在包含混合耦合器，平衡二极管检测器和所需的混频器输出滤波器的微带电路中进行。 该装置成本低廉，并且提供了低噪声系数（包括前置放大器的7分贝），良好的频带选择性（通信频带上的15db回波损耗）和低的本地振荡器辐射。