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公开(公告)号：US11566922B2
公开(公告)日：2023-01-31
申请号：US16878054
申请日：2020-05-19
Applicant: PIXART IMAGING INC.
Inventor： Chung-Min Thor , Meng-Yee Lim
Abstract: There is provided an optical encoder with alignable relative positions between elements including an encoding medium, a sensor package and a memory. The sensor package includes a photodiode array and two alignment photodiodes opposite to the encoding medium. The memory records an alignment pattern associated with output signals of the two alignment photodiodes when the encoding medium and the sensor package are at nominal operating positions. When the encoding medium and the sensor package are not at the nominal operating positions, the relative position alignment is performed by adjusting current relative positions between the encoding medium and the sensor package to cause a current pattern associated with output signals of the two alignment photodiodes to be identical to the alignment pattern.
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2.发明授权公开(公告)号：US12203956B2
公开(公告)日：2025-01-21
申请号：US18528828
申请日：2023-12-05
Applicant: PixArt Imaging Inc.
Inventor： Chung-Min Thor , Kuan-Choong Shim
Abstract: There is provided an optical encoder including a phase shifter circuit and a multiple hysteresis comparators. The phase shifter circuit receives four input signals, and outputs multiple phase shifted signals based on the four input signals. Each of the multiple hysteresis comparators uses a changeable operation hysteresis level to compare a couple of phase shifted signals among the multiple phase shifted signals, wherein the changeable operation hysteresis level is determined corresponding to a signal frequency of the four input signals.
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公开(公告)号：US11644345B2
公开(公告)日：2023-05-09
申请号：US17240140
申请日：2021-04-26
Applicant: PIXART IMAGING INC.
Inventor： Chung-Min Thor , Kuan-Choong Shim
IPC: G01D5/347
CPC classification number: G01D5/34715
Abstract: There is provided an optical encoder including an encoding medium and a substrate. The encoding medium has a relative movement with respect to the substrate in a predetermined direction. The substrate includes an index photodiode and two control photodiodes. The index photodiode is arranged between the two control photodiodes along the predetermined direction. The output signals of the two control photodiodes are for controlling ON/OFF of gain regulation on an output signal of the index photodiode so as to turn on the gain regulation within an interval during which the index photodiode does not generate an index pulse but to turn off the gain regulation within an interval during which the index photodiode generates the index pulse.
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公开(公告)号：US20240125629A1
公开(公告)日：2024-04-18
申请号：US18530250
申请日：2023-12-06
Applicant: PixArt Imaging Inc.
Inventor： Chung-Min Thor , Meng-Yee Lim
CPC classification number: G01D5/366 , G01D5/2457 , G01D5/3473 , G01D18/00
Abstract: There is provided an optical encoder with alignable relative positions between elements including an encoding medium, a sensor package and a memory. The sensor package includes a photodiode array and two alignment photodiodes opposite to the encoding medium. The memory records an alignment pattern associated with output signals of the two alignment photodiodes when the encoding medium and the sensor package are at nominal operating positions. When the encoding medium and the sensor package are not at the nominal operating positions, the relative position alignment is performed by adjusting current relative positions between the encoding medium and the sensor package to cause a current pattern associated with output signals of the two alignment photodiodes to be identical to the alignment pattern.
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Patent Agency Ranking
公开(公告)号：US11874147B2
公开(公告)日：2024-01-16
申请号：US18083621
申请日：2022-12-19
Applicant: PIXART IMAGING INC.
Inventor： Chung-Min Thor , Meng-Yee Lim
CPC classification number: G01D5/366 , G01D5/2457 , G01D5/3473 , G01D18/00
Abstract: There is provided an optical encoder with alignable relative positions between elements including an encoding medium, a sensor package and a memory. The sensor package includes a photodiode array and two alignment photodiodes opposite to the encoding medium. The memory records an alignment pattern associated with output signals of the two alignment photodiodes when the encoding medium and the sensor package are at nominal operating positions. When the encoding medium and the sensor package are not at the nominal operating positions, the relative position alignment is performed by adjusting current relative positions between the encoding medium and the sensor package to cause a current pattern associated with output signals of the two alignment photodiodes to be identical to the alignment pattern.
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公开(公告)号：US12181315B2
公开(公告)日：2024-12-31
申请号：US18530250
申请日：2023-12-06
Applicant: PixArt Imaging Inc.
Inventor： Chung-Min Thor , Meng-Yee Lim
Abstract: There is provided an optical encoder with alignable relative positions between elements including an encoding medium, a sensor package and a memory. The sensor package includes a photodiode array and two alignment photodiodes opposite to the encoding medium. The memory records an alignment pattern associated with output signals of the two alignment photodiodes when the encoding medium and the sensor package are at nominal operating positions. When the encoding medium and the sensor package are not at the nominal operating positions, the relative position alignment is performed by adjusting current relative positions between the encoding medium and the sensor package to cause a current pattern associated with output signals of the two alignment photodiodes to be identical to the alignment pattern.
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公开(公告)号：US12117318B2
公开(公告)日：2024-10-15
申请号：US18129077
申请日：2023-03-31
Applicant: PIXART IMAGING INC.
Inventor： Chung-Min Thor , Kuan-Choong Shim
IPC: G01D5/347
CPC classification number: G01D5/34715
Abstract: There is provided an optical encoder including an encoding medium and a substrate. The encoding medium has a relative movement with respect to the substrate in a predetermined direction. The substrate includes an index photodiode and two control photodiodes. The index photodiode is arranged between the two control photodiodes along the predetermined direction. The output signals of the two control photodiodes are for controlling ON/OFF of gain regulation on an output signal of the index photodiode so as to turn on the gain regulation within an interval during which the index photodiode does not generate an index pulse but to turn off the gain regulation within an interval during which the index photodiode generates the index pulse.
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公开(公告)号：US11885828B2
公开(公告)日：2024-01-30
申请号：US17582194
申请日：2022-01-24
Applicant: PIXART IMAGING INC.
Inventor： Chung-Min Thor , Kuan-Choong Shim
CPC classification number: G01P3/36 , G01P3/486 , G01D5/249 , G01D5/34 , G01D5/34715
Abstract: There is provided an optical encoder including a phase shifter circuit and a multiple hysteresis comparators. The phase shifter circuit receives four input signals, and outputs multiple phase shifted signals based on the four input signals. Each of the multiple hysteresis comparators uses a changeable operation hysteresis level to compare a couple of phase shifted signals among the multiple phase shifted signals, wherein the changeable operation hysteresis level is determined corresponding to a signal frequency of the four input signals.
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公开(公告)号：US11108385B1
公开(公告)日：2021-08-31
申请号：US16907948
申请日：2020-06-22
Applicant: PixArt Imaging Inc.
Inventor： Chung-Min Thor , Kuan-Choong Shim , Gim-Eng Chew
Abstract: There is provided a phase shifter circuit of an optical encoder that receives four signals generated from photodiodes. The phase shifter circuit includes four resistor strings each coupled to two of the four signals having a 90-degrees phase pitch. By taping out different numbers of signals at different tape-out nodes of each of the four resistor strings, the phase shifter circuit is adapted to output signals for different interpolation factors without changing the mask set.
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