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公开(公告)号：US20200022235A1
公开(公告)日：2020-01-16
申请号：US16579121
申请日：2019-09-23
Applicant: PixArt Imaging Inc.
Inventor： KUAN-CHOONG SHIM , GIM-ENG CHEW
IPC: H05B33/08
Abstract: There is provided a light control circuit including a detected voltage generating circuit, a reference voltage generating circuit, an error amplifier, an NMOS driver and a light source. The detected voltage generating circuit outputs a detected voltage to a first input terminal of the error amplifier. The reference voltage generating circuit outputs a reference voltage to a second input terminal of the error amplifier. The NMOS driver changes a drive current of the light source according to an output of the error amplifier.
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公开(公告)号：US20230349732A1
公开(公告)日：2023-11-02
申请号：US18219729
申请日：2023-07-10
Applicant: PixArt Imaging Inc.
Inventor： KUAN-CHOONG SHIM , GIM-ENG CHEW , PRISCILLA TZE-WEI GOH , MENG-YEE LIM
IPC: G01D5/347
CPC classification number: G01D5/3473
Abstract: There is provided an optical encoder including an encoding medium, multiple photodiodes and a signal processing circuit. The encoding medium includes an index track. The index track includes a first index pattern and a second index pattern. The multiple photodiodes include a first index photodiode, a second index photodiode and a reference index photodiode for receiving modulated light from the first index pattern and the second index pattern. When the first index photodiode is aligned with the first index pattern and the second index photodiode is aligned with the second index pattern, the signal processing circuit outputs a triggering signal.
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公开(公告)号：US20230314187A1
公开(公告)日：2023-10-05
申请号：US18206584
申请日：2023-06-06
Applicant: PixArt Imaging Inc.
Inventor： KUAN-CHOONG SHIM , GIM-ENG CHEW
IPC: G01D5/347
CPC classification number: G01D5/3473 , G01D5/34707
Abstract: There is provided an optical encoder including a photodiode array and a code disk opposite to each other. The photodiode array includes at least three sets of position photodiodes and two index photodiodes arranged transversally. The two index photodiodes are adjacently arranged at the same side of the at least three sets of position photodiodes. A first set of position photodiodes and a last set of position photodiodes of the at least three sets of position photodiodes are partially covered to alleviate the total harmonic distortion. The rest position photodiodes of the at least three sets of position photodiodes other than the first and last sets of position photodiodes are not covered.
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Patent Agency Ranking
4.发明申请公开(公告)号：US20250093378A1
公开(公告)日：2025-03-20
申请号：US18970976
申请日：2024-12-06
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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5.发明公开公开(公告)号：US20240103032A1
公开(公告)日：2024-03-28
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：US20230408304A1
公开(公告)日：2023-12-21
申请号：US18239773
申请日：2023-08-30
Applicant: PixArt Imaging Inc.
Inventor： KUAN-CHOONG SHIM , GIM-ENG CHEW
CPC classification number: G01D5/34715 , G01D5/3473 , G01D5/24466 , G01D5/24457 , G01D5/24428 , G01D5/24471 , G01D5/24476
Abstract: There is provided a light control circuit including a light detector, a frequency detector, an error amplifier, an NMOS driver and a light source. The frequency detector identifies a signal frequency according to detected voltage signals outputted by the light detector and generates a control signal accordingly. The NMOS driver changes a drive current of the light source according to an output of the error amplifier. The error amplifier changes a bandwidth thereof according to the control signal from the frequency detector to regulate a response time of the drive current of the light source.
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公开(公告)号：US20220221312A1
公开(公告)日：2022-07-14
申请号：US17710096
申请日：2022-03-31
Applicant: PixArt Imaging Inc.
Inventor： KUAN-CHOONG SHIM , GIM-ENG CHEW
Abstract: There is provided a light control circuit including a light detector, a frequency detector, an error amplifier, an NMOS driver and a light source. The frequency detector identifies a signal frequency according to detected voltage signals outputted by the light detector and generates a control signal accordingly. The NMOS driver changes a drive current of the light source according to an output of the error amplifier. The error amplifier changes a bandwidth thereof according to the control signal from the frequency detector to regulate a response time of the drive current of the light source.
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公开(公告)号：US20220099464A1
公开(公告)日：2022-03-31
申请号：US17545116
申请日：2021-12-08
Applicant: PixArt Imaging Inc.
Inventor： KUAN-CHOONG SHIM , GIM-ENG CHEW
IPC: G01D5/347
Abstract: There is provided an optical encoder including a photodiode array and a code disk opposite to each other. The photodiode array includes at least three sets of position photodiodes and two index photodiodes arranged transversally. The two index photodiodes are adjacently arranged at the same side of the at least three sets of position photodiodes. A first set of position photodiodes and a last set of position photodiodes of the at least three sets of position photodiodes are partially covered to alleviate the total harmonic distortion. The rest position photodiodes of the at least three sets of position photodiodes other than the first and last sets of position photodiodes are not covered.
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