公开(公告)号：US20240426639A1

公开(公告)日：2024-12-26

申请号：US18824949

申请日：2024-09-05

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.

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

IPC: G01P3/486 ,  G01D5/249 ,  G01D5/34 ,  G01D5/347 ,  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：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

IPC: G01P3/36 ,  G01P3/486

CPC classification number: G01P3/36 ,  G01P3/486 ,  G01D5/249

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.