公开(公告)号：US07649220B2

公开(公告)日：2010-01-19

申请号：US11693518

申请日：2007-03-29

申请人： Farn Hin Chen ,  Gim Eng Chew ,  Boon Keat Tan

发明人： Farn Hin Chen ,  Gim Eng Chew ,  Boon Keat Tan

IPC分类号： H01L31/062

CPC分类号： G01N21/251 ,  G01J1/0488 ,  G01J1/1626 ,  G01J1/4228 ,  G01N2201/12707

摘要： A photodetector and method for making the same is disclosed. The photodetector includes a substrate having first, second, and third photodiodes and first and second pigment filter layers. The first, second, and third photodiodes generate first, second, and third photodiode output signals, respectively, each photodiode output signal being indicative of a light intensity incident on that photodiode and a dark current that is independent of the light intensity. The first and second pigment filter layers overlie the first and second photodiodes while a layer having both the first and second pigment filter layers overlie the third photodiode. An output circuit combines the first and third photodiode output signals to provide a first corrected output signal and combines the second and third photodiode output signals to provide a second corrected output signal.

摘要翻译： 公开了一种光电检测器及其制造方法。 光电探测器包括具有第一，第二和第三光电二极管以及第一和第二颜料过滤层的衬底。 第一，第二和第三光电二极管分别产生第一，第二和第三光电二极管输出信号，每个光电二极管输出信号指示入射在该光电二极管上的光强度和独立于光强度的暗电流。 第一和第二颜料过滤层覆盖在第一和第二光电二极管上，而具有第一和第二颜料过滤层的层覆盖在第三光电二极管上。 输出电路组合第一和第三光电二极管输出信号以提供第一校正输出信号，并组合第二和第三光电二极管输出信号以提供第二校正输出信号。

公开(公告)号：US20080239321A1

公开(公告)日：2008-10-02

申请号：US11693518

申请日：2007-03-29

申请人： Farn Hin Chen ,  Gim Eng Chew ,  Boon Keat Tan

发明人： Farn Hin Chen ,  Gim Eng Chew ,  Boon Keat Tan

IPC分类号： G01N21/25 ,  H01L31/0232 ,  H01L31/18

CPC分类号： G01N21/251 ,  G01J1/0488 ,  G01J1/1626 ,  G01J1/4228 ,  G01N2201/12707

摘要： A photodetector and method for making the same is disclosed. The photodetector includes a substrate having first, second, and third photodiodes and first and second pigment filter layers. The first, second, and third photodiodes generate first, second, and third photodiode output signals, respectively, each photodiode output signal being indicative of a light intensity incident on that photodiode and a dark current that is independent of the light intensity. The first and second pigment filter layers overlie the first and second photodiodes while a layer having both the first and second pigment filter layers overlie the third photodiode. An output circuit combines the first and third photodiode output signals to provide a first corrected output signal and combines the second and third photodiode output signals to provide a second corrected output signal.

摘要翻译： 公开了一种光电检测器及其制造方法。 光电探测器包括具有第一，第二和第三光电二极管以及第一和第二颜料过滤层的衬底。 第一，第二和第三光电二极管分别产生第一，第二和第三光电二极管输出信号，每个光电二极管输出信号指示入射在该光电二极管上的光强度和独立于光强度的暗电流。 第一和第二颜料过滤层覆盖在第一和第二光电二极管上，而具有第一和第二颜料过滤层的层覆盖在第三光电二极管上。 输出电路组合第一和第三光电二极管输出信号以提供第一校正输出信号，并组合第二和第三光电二极管输出信号以提供第二校正输出信号。

公开(公告)号：US20130228676A1

公开(公告)日：2013-09-05

申请号：US13409815

申请日：2012-03-01

申请人： Kheng Hin Toh ,  Gim Eng Chew

发明人： Kheng Hin Toh ,  Gim Eng Chew

IPC分类号： G01D5/34 ,  H05B37/02

CPC分类号： G01D5/34715 ,  H05B33/0851

摘要： An LED current regulator can regulate an LED current of an encoder system. The LED current regulator may comprise a first analog multiplier and a second analog multiplier. Each of the first and second analog multipliers may be configured to receive respective photodetector output signals, characterized by a peak-to-peak voltage, Vpp, and may be configured to generate respective first and second multiplier output signals. The first and second multiplier output signals may be combined to produce a first DC level, which may be representative of the peak-to-peak voltage, Vpp, of the photodetector output signals.

摘要翻译： LED电流调节器可以调节编码器系统的LED电流。 LED电流调节器可以包括第一模拟乘法器和第二模拟乘法器。 第一和第二模拟乘法器中的每一个可以被配置为接收相应的光电检测器输出信号，其特征在于峰 - 峰值电压Vpp，并且可以被配置为产生相应的第一和第二乘法器输出信号。 第一和第二乘法器输出信号可以被组合以产生第一DC电平，其可以代表光电检测器输出信号的峰 - 峰电压Vpp。

公开(公告)号：US20130181122A1

公开(公告)日：2013-07-18

申请号：US13352152

申请日：2012-01-17

申请人： Gim Eng Chew ,  Kheng Hin Toh

发明人： Gim Eng Chew ,  Kheng Hin Toh

IPC分类号： G01D5/34

CPC分类号： G01D5/2448

摘要： An offset correction system for correcting signal offset of an encoder. The offset correction system may include a light emitter, an encoder disk, a reticle, a light detector; an offset detection circuit and an offset correction circuit. The offset detection circuit may comprise a comparator and an offset detector configured to receive sinusoidal output signals from the light detector and a reference signal to create digital pulses for determining the signal offset. The offset correction circuit may be configured to apply a gain to correct the offset output signal. The offset correction may be implemented in real time mode.

摘要翻译： 用于校正编码器的信号偏移的偏移校正系统。 偏移校正系统可以包括光发射器，编码器盘，光罩，光检测器; 偏移检测电路和偏移校正电路。 偏移检测电路可以包括比较器和偏移检测器，其被配置为从光检测器接收正弦输出信号和参考信号以产生用于确定信号偏移的数字脉冲。 偏移校正电路可以被配置为施加增益以校正偏移输出信号。 偏移校正可以在实时模式下实现。

公开(公告)号：US20100252719A1

公开(公告)日：2010-10-07

申请号：US12727980

申请日：2010-03-19

申请人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

发明人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

IPC分类号： G01D5/34 ,  H03G3/20

CPC分类号： G01D5/24476 ,  G01D5/34707

摘要： According to one embodiment, there is provided a device and method for correcting code wheel misalignment which employs upper and lower code wheel misalignment photodetectors positioned above and below at least first and second motion detection photodetectors. According to other embodiments, there are provided a device and method for automatically setting the gain of an output circuit in an optical encoder. Still further embodiments of optical encoders combine the code wheel misalignment and automatic gain control features of the invention.

摘要翻译： 根据一个实施例，提供了一种用于校正码盘未对准的装置和方法，其采用位于至少第一和第二运动检测光电检测器上方和下方的上和下码轮未对准光电检测器。 根据其他实施例，提供了一种用于自动设置光学编码器中的输出电路的增益的装置和方法。 光学编码器的另外的实施例组合了本发明的码盘未对准和自动增益控制特征。

公开(公告)号：US07601940B2

公开(公告)日：2009-10-13

申请号：US11690019

申请日：2007-03-22

申请人： Gim Eng Chew ,  Aik Yean Tang ,  Mei Yee Ng

发明人： Gim Eng Chew ,  Aik Yean Tang ,  Mei Yee Ng

IPC分类号： H03G3/20 ,  G01J1/44 ,  H03F3/08

CPC分类号： H03G3/3084

摘要： An optical receiver having a photodetector, a variable gain amplifier, and a gain control circuit is disclosed. The photodetector generates a photodetector output signal related to an intensity of light received by the photodetector, the photodetector output signal being characterized by a peak-to-peak signal value. The variable gain amplifier amplifies the photodetector output signal to generate a receiver output signal that is coupled to an external device, the variable gain amplifier having a gain that is determined by a gain control signal. The gain control circuit receives the receiver output signal and generates the gain control signal therefrom. The gain control signal causes the gain of the variable gain amplifier to decrease as a function of the peak-to-peak signal value to reduce changes in the output signal amplitude as a function of the input light signal amplitude.

摘要翻译： 公开了一种具有光电检测器，可变增益放大器和增益控制电路的光接收器。 光电检测器产生与由光电检测器接收的光的强度相关的光电检测器输出信号，光电检测器输出信号的特征在于峰 - 峰信号值。 可变增益放大器放大光电检测器输出信号以产生耦合到外部设备的接收机输出信号，该可变增益放大器具有由增益控制信号确定的增益。 增益控制电路接收接收机输出信号并从其生成增益控制信号。 增益控制信号使得可变增益放大器的增益作为峰 - 峰信号值的函数而减小，以减小作为输入光信号幅度的函数的输出信号幅度的变化。

公开(公告)号：US07355160B2

公开(公告)日：2008-04-08

申请号：US11369288

申请日：2006-03-06

申请人： Chiang Sun Cheah ,  Gim Eng Chew ,  Li Chong Tai

发明人： Chiang Sun Cheah ,  Gim Eng Chew ,  Li Chong Tai

IPC分类号： G06M7/00 ,  H01J40/14

CPC分类号： G06F3/0317

摘要： A pointing device and method for using the same to measure the motion of that pointing device over a surface is disclosed. The pointing device includes an illumination system, an imaging system, and a controller. The illumination system generates light in a plurality of wavelength bands and illuminates a surface below the pointing device with light from one of the wavelength bands. The imaging system records images of the illuminated surface. The controller selects the wavelength band used to illuminate the surface, compares first and second images recorded by the imaging system at different times when the surface is illuminated with that wavelength band, and determines a displacement indicative of the direction and distance the positioning device moved between the two different times.

摘要翻译： 公开了一种用于使其指示装置在表面上的运动的指示装置和方法。 指示装置包括照明系统，成像系统和控制器。 照明系统产生多个波长带中的光并用来自波长带中的一个的光照亮指示装置下方的表面。 成像系统记录被照射表面的图像。 控制器选择用于照亮表面的波长带，比较当用该波长带照射表面时在不同时间由成像系统记录的第一和第二图像，并且确定指示定位装置在其间移动的方向和距离的位移 两个不同的时代。

公开(公告)号：US08035074B2

公开(公告)日：2011-10-11

申请号：US12368299

申请日：2009-02-09

申请人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

发明人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

IPC分类号： H03G3/20 ,  G01D5/34

CPC分类号： G01D21/00 ,  G01D1/00 ,  G01D15/00 ,  H03G3/30

摘要： Disclosed are various embodiments of pulse generation and automatic gain control (“AGC”) circuits and corresponding methods that are especially well suited for use in motion encoding systems. Analog output signals provided by a motion encoder serve as inputs to the pulse generation circuit, where peaks, valleys and/or crosspoints corresponding to such analog signals are first detected and then employed to generate output pulses corresponding thereto. These output pulses are next provided to an AGC circuit as self-generated clock signals which control the time windows over which the analog signals of the motion encoder are sampled and processed by the AGC circuit so as to adjust the gains applied to such analog signals.

摘要翻译： 公开了特别适用于运动编码系统的脉冲发生和自动增益控制（“AGC”）电路和相应方法的各种实施例。 由运动编码器提供的模拟输出信号用作脉冲发生电路的输入，其中首先检测对应于这种模拟信号的峰值，谷值和/或交叉点，然后用于产生与之对应的输出脉冲。 这些输出脉冲随后作为自动生成的时钟信号提供给AGC电路，该时钟信号控制由AGC电路对运动编码器的模拟信号进行采样和处理的时间窗口，以调整应用于这种模拟信号的增益。

公开(公告)号：US07709784B2

公开(公告)日：2010-05-04

申请号：US12112962

申请日：2008-04-30

申请人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

发明人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

IPC分类号： G01D5/34

CPC分类号： G01D5/24476 ,  G01D5/34707

摘要： According to one embodiment, there is provided a device and method for correcting code wheel misalignment which employs upper and lower code wheel misalignment photodetectors positioned above and below at least first and second motion detection photodetectors. According to other embodiments, there are provided a device and method for automatically setting the gain of an output circuit in an optical encoder. Still further embodiments of optical encoders combine the code wheel misalignment and automatic gain control features of the invention.

摘要翻译： 根据一个实施例，提供了一种用于校正码盘未对准的装置和方法，其采用位于至少第一和第二运动检测光电检测器上方和下方的上和下码轮未对准光电检测器。 根据其他实施例，提供了一种用于自动设置光学编码器中的输出电路的增益的装置和方法。 光学编码器的另外的实施例组合了本发明的码盘未对准和自动增益控制特征。

公开(公告)号：US20090272884A1

公开(公告)日：2009-11-05

申请号：US12112867

申请日：2008-04-30

申请人： Kheng Hin Toh ,  Gim Eng Chew ,  Nanta-Kumar Payandi

发明人： Kheng Hin Toh ,  Gim Eng Chew ,  Nanta-Kumar Payandi

IPC分类号： G01D5/34

CPC分类号： G01D3/036 ,  G01D5/3473

摘要： According to one embodiment, there is provided an optical encoder having a photodetector array comprising motion detection photodetectors and at least one reference photodetector vertically offset from the motion detection photodetectors. The output signal generated by the at least one reference photodetectors is employed to correct undesired variations in the amplitudes of the output signals generated by the motion detection photodetectors. Such variations typically arise from various mechanical and optical misalignments in the optical encoder, and are compensated for by using the reference output signal to add to or subtract from, as required, the amplitudes of motion detection output signals.

摘要翻译： 根据一个实施例，提供了一种光学编码器，其具有包括运动检测光电检测器和至少一个垂直偏离运动检测光电检测器的参考光电检测器的光电检测器阵列。 采用由至少一个参考光电检测器产生的输出信号来校正由运动检测光电检测器产生的输出信号的幅度的不期望的变化。 这种变化通常来自光学编码器中的各种机械和光学不对准，并且通过使用参考输出信号来补偿运动检测输出信号的幅度，根据需要来补偿。