公开(公告)号：US4585310A

公开(公告)日：1986-04-29

申请号：US560475

申请日：1983-12-12

申请人： Nicholas J. Clecak ,  Robert J. Cox ,  Joseph S. Feng ,  Jerry Leff

发明人： Nicholas J. Clecak ,  Robert J. Cox ,  Joseph S. Feng ,  Jerry Leff

IPC分类号： G02F1/13 ,  G02F1/133 ,  G02F1/1335 ,  G02F1/1337

CPC分类号： G02F1/132 ,  G02F1/133502 ,  G02F1/1337

摘要： The orientation of the alignment layer in a raster-scanned thermally addressed smectic liquid crystal display device can be chosen relative to the writing orientation to accentuate a selected characteristic. A perpendicular alignment with respect to the scan direction produces uniformly written images in both scan directions to allow high quality bidirectional writing. In a preferred embodiment the liquid crystal cell includes a liquid crystal material comprising 4-octyloxy-4'-cyanobiphenyl 37.5%, 4-decyl-4'-cyanobiphenyl 36.8% weight percent and 4-undecyl-4'-cyanobiphenyl 25.7 weight percent.

摘要翻译： 可以相对于写入取向选择光栅扫描的热寻址近晶体液晶显示装置中的取向层的取向，以突出所选择的特性。 相对于扫描方向的垂直对准在两个扫描方向上产生均匀的写入图像，以允许高质量的双向写入。 在一个优选的实施方案中，液晶单元包括一种液晶材料，其包含37.5％4-辛氧基-4'-氰基联苯，36.8％重量的4-癸基-4'-氰基联苯和25.7％重量的4-十四烷基-4'-氰基联苯。

公开(公告)号：US4132864A

公开(公告)日：1979-01-02

申请号：US792079

申请日：1977-04-28

申请人： Joseph S. Feng

发明人： Joseph S. Feng

IPC分类号： H04M3/02 ,  H04M3/06 ,  H04M19/02 ,  H04M3/22 ,  G04F9/00

CPC分类号： H04M19/026

摘要： The duty cycle of an AC telephone off-hook signal is measured by means of comparing it with the duty cycle of a known AC signal having a duty cycle of 0.5 because it has a DC component of zero. Measurement of the duty cycle in a telephone off-hook detector application involves measuring the DC portion of the signal on a pair of telephone lines from a telephone handset to an exchange. A high frequency master clock oscillator with a much higher frequency than the basic ringing voltage is used. An input signal is used to gate clock pulses to a counter when the input signal is positive. At the end of a predetermined number of clock pulses, the counter is gated into memory connected to a decoder for transmission of the decoded signal to the exchange for appropriate action.

摘要翻译： 通过将AC电话摘机信号的占空比与占空比为0.5的已知交流信号的占空比进行比较来测量，因为其DC分量为零。 电话摘机检测器应用中占空比的测量涉及测量从电话听筒到交换机的一对电话线上的信号的直流部分。 使用高于基本振铃电压的高频主时钟振荡器。 当输入信号为正时，输入信号用于将时钟脉冲输入到计数器。 在预定数量的时钟脉冲结束时，计数器被选通到连接到解码器的存储器中，用于将解码信号传输到交换机以进行适当的动作。