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1. 发明申请

US20130228676A1 Optical Encoder With An LED Current Regulation System 有权
标题翻译：具有LED电流调节系统的光学编码器
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。

2. 发明申请

US20130181122A1 OPTICAL ENCODER WITH SIGNAL OFFSET CORRECTION SYSTEM 有权
标题翻译：具有信号偏差校正系统的光学编码器
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。

3. 发明申请

US20090272884A1 Optical Encoder with Amplitude Correction 有权
标题翻译：具有幅度校正的光学编码器
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。

4. 发明授权

US08835832B2 Optical encoder with signal offset correction system 有权
标题翻译：具有信号偏移校正系统的光学编码器
公开(公告)号：US08835832B2
公开(公告)日：2014-09-16
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。

5. 发明申请

US20100214139A1 Interpolation Accuracy Improvement in Motion Encoder Systems, Devices and Methods 有权
标题翻译：运动编码器系统，设备和方法的插补精度提高
公开(公告)号：US20100214139A1
公开(公告)日：2010-08-26
申请号：US12533841
申请日：2009-07-31
申请人： Kheng Hin Toh , Gim Eng Chew
发明人： Kheng Hin Toh , Gim Eng Chew
IPC分类号： H03M1/48
CPC分类号： G01D5/24419 , G01D5/245 , H03K5/1252 , H03K5/156 , H03K2005/00052 , H03M1/207 , H03M1/365 , H03M1/367 , H03M1/485
摘要： Disclosed are various embodiments of interpolation circuits for use in conjunction with optical encoders. The analog output signals provided by incremental or absolute motion encoders are provided to an interpolation circuit, which is capable of providing high interpolation factor output signals having high timing accuracy. The disclosed interpolation circuits may be implemented using CMOS or BiCMOS processes without undue effort.
摘要翻译：公开了与光学编码器结合使用的内插电路的各种实施例。由增量或绝对运动编码器提供的模拟输出信号被提供给能够提供高定时精度的高内插因子输出信号的内插电路。公开的内插电路可以使用CMOS或BiCMOS处理而不用过度的努力来实现。

6. 发明授权

US08890045B2 Optical encoder with a current regulating circuit for a light emitter 有权
标题翻译：具有光发射器电流调节电路的光学编码器
公开(公告)号：US08890045B2
公开(公告)日：2014-11-18
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： G01J1/32
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。

7. 发明授权

US07880658B2 Interpolation accuracy improvement in motion encoder systems, devices and methods 有权
标题翻译：运动编码器系统，装置和方法的插补精度提高
公开(公告)号：US07880658B2
公开(公告)日：2011-02-01
申请号：US12533841
申请日：2009-07-31
申请人： Kheng Hin Toh , Gim Eng Chew
发明人： Kheng Hin Toh , Gim Eng Chew
IPC分类号： H03M1/12
CPC分类号： G01D5/24419 , G01D5/245 , H03K5/1252 , H03K5/156 , H03K2005/00052 , H03M1/207 , H03M1/365 , H03M1/367 , H03M1/485
摘要： Disclosed are various embodiments of interpolation circuits for use in conjunction with optical encoders. The analog output signals provided by incremental or absolute motion encoders are provided to an interpolation circuit, which is capable of providing high interpolation factor output signals having high timing accuracy. The disclosed interpolation circuits may be implemented using CMOS or BiCMOS processes without undue effort.
摘要翻译：公开了与光学编码器结合使用的内插电路的各种实施例。由增量或绝对运动编码器提供的模拟输出信号被提供给能够提供高定时精度的高内插因子输出信号的内插电路。公开的内插电路可以使用CMOS或BiCMOS处理而不用过度的努力来实现。

8. 发明授权

US07732754B2 Optical encoder with amplitude correction 有权
标题翻译：具有幅度校正的光学编码器
公开(公告)号：US07732754B2
公开(公告)日：2010-06-08
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。

9. 发明授权

US07552873B2 Transmissive optical encoder 有权
标题翻译：透射光学编码器
公开(公告)号：US07552873B2
公开(公告)日：2009-06-30
申请号：US11226684
申请日：2005-09-14
申请人： Boon Keat Tan , Kheng Hin Toh , Susan Hunter
发明人： Boon Keat Tan , Kheng Hin Toh , Susan Hunter
IPC分类号： G06K7/10
CPC分类号： G01D5/34707
摘要： In one embodiment, an optical encoder includes a light source, a detector array and a code member. The detector array is positioned in spaced-apart relation to the light source and includes at least one detector set. Each of the at least one detector sets includes a plurality of detector elements. The code member 1) is positioned between the light source and the detector array, 2) is moveable with respect to the detector array along a displacement direction, and 3) defines a plurality of circular or elliptical openings through which light emitted by the light source is filtered to produce light spots that travel across the detector array as the code member moves with respect to the detector array. Other embodiments are also disclosed.
摘要翻译：在一个实施例中，光学编码器包括光源，检测器阵列和代码构件。检测器阵列以与光源隔开的关系定位，并且包括至少一个检测器组。所述至少一个检测器组中的每一个包括多个检测器元件。代码构件1）位于光源和检测器阵列之间，2）沿着位移方向相对于检测器阵列可移动，以及3）限定多个圆形或椭圆形的开口，光源发射的光被过滤以产生穿过检测器阵列行进的光点，因为代码元件相对于检测器阵列移动。还公开了其他实施例。

10. 发明授权

US07521669B2 Multi-bit absolute position optical encoder with reduced number of tracks 有权
标题翻译：多位绝对位置光学编码器，轨道数减少
公开(公告)号：US07521669B2
公开(公告)日：2009-04-21
申请号：US11445661
申请日：2006-06-02
申请人： Kheng Hin Toh , Lee Ling Teh , Chung Min Thor , Boon Keat Tan
发明人： Kheng Hin Toh , Lee Ling Teh , Chung Min Thor , Boon Keat Tan
IPC分类号： G01D5/30
CPC分类号： H03M1/28 , H03M1/26
摘要： An optical encoder includes a coding element having a track with a track pattern that comprises multiple optically distinguishable sections. The optical encoder compares photodetector outputs with transition-specific thresholds that correspond to transitions between the optically distinguishable sections of the track. The comparisons are used to determine when the transition between two optically distinguishable sections of the track has passed the photodetector. Knowledge of the transition between two optically distinguishable sections is then translated into digital position information.
摘要翻译：光学编码器包括具有轨道图案的轨道的编码元件，其包括多个可光学区分的区域。光学编码器将光电检测器输出与对应于轨道的光学可区分部分之间的跃迁的转变特定阈值进行比较。比较用于确定轨道的两个光学可区分部分之间的转变何时已经通过光电检测器。然后将两个光学可区分部分之间的转换的知识转换成数字位置信息。

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