公开(公告)号：US20220163353A1

公开(公告)日：2022-05-26

申请号：US17104822

申请日：2020-11-25

Applicant: PixArt Imaging Inc.

Inventor： Kuan-Choong SHIM ,  Gim-Eng CHEW ,  Priscilla Tze-Wei GOH ,  Meng-Yee LIM

IPC: G01D5/347

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.

公开(公告)号：US20240133680A1

公开(公告)日：2024-04-25

申请号：US17970566

申请日：2022-10-20

Applicant: PIXART IMAGING INC.

Inventor： Meng-Yee LIM ,  Priscilla Tze-Wei GOH ,  Kuan-Choong SHIM ,  Gim-Eng CHEW

IPC: G01B11/26 ,  G01D5/26

CPC classification number: G01B11/26 ,  G01D5/264

Abstract: There is provided an optical encoding system including a photodiode array and a code disk opposite to each other. The code disk is arranged with multiple code slits at a ring area corresponding to the photodiode array. A length direction of each photodiode of the photodiode array has at least one deviation angle with respect to a length direction of the multiple code slits to reduce the total harmonic distortion in photocurrents.

公开(公告)号：US20240230321A9

公开(公告)日：2024-07-11

申请号：US17970566

申请日：2022-10-21

Applicant: PIXART IMAGING INC.

Inventor： Meng-Yee LIM ,  Priscilla Tze-Wei GOH ,  Kuan-Choong SHIM ,  Gim-Eng CHEW

IPC: G01B11/26 ,  G01D5/26

CPC classification number: G01B11/26 ,  G01D5/264

Abstract: There is provided an optical encoding system including a photodiode array and a code disk opposite to each other. The code disk is arranged with multiple code slits at a ring area corresponding to the photodiode array. A length direction of each photodiode of the photodiode array has at least one deviation angle with respect to a length direction of the multiple code slits to reduce the total harmonic distortion in photocurrents.

公开(公告)号：US20220341961A1

公开(公告)日：2022-10-27

申请号：US17582194

申请日：2022-01-24

Applicant: PIXART IMAGING INC.

Inventor： Chung-Min THOR ,  Kuan-Choong SHIM

IPC: G01P3/36

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.

公开(公告)号：US20230236042A1

公开(公告)日：2023-07-27

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.

公开(公告)号：US20220341762A1

公开(公告)日：2022-10-27

申请号：US17240140

申请日：2021-04-26

Applicant: PIXART IMAGING INC.

Inventor： Chung-Min THOR ,  Kuan-Choong SHIM

IPC: G01D5/347

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.