公开(公告)号：US20220334014A1

公开(公告)日：2022-10-20

申请号：US17233806

申请日：2021-04-19

Applicant: PIXART IMAGING INC.

Inventor： CHE-CHIA HSU ,  YU-HAN CHEN ,  CHI-CHIEH LIAO

IPC: G01L9/12 ,  G01L9/00

Abstract: A pressure sensing unit, a capacitive hybrid sensor device, and an input apparatus using the same are provided. The pressure sensing unit for detecting pressing events includes a pressure sensing pad group and a floating conductive element. The pressure sensing pad group includes a first pressure sensing pad, a second pressure sensing pad, and a ground pad that are spaced apart from one another. The first pressure sensing pad and the second pressure sensing pad are electrically shielded from each other by the ground pad. One of the floating conductive element and the pressure sensing pad group is configured to be movable in a movement direction relative to another one of the floating conductive element and the pressure sensing pad group. The floating conductive element overlaps with the pressure sensing pad group in the movement direction.

公开(公告)号：US20220209771A1

公开(公告)日：2022-06-30

申请号：US17134940

申请日：2020-12-28

Applicant: PIXART IMAGING INC.

Inventor： CHE-CHIA HSU ,  YU-HAN CHEN ,  CHI-CHIEH LIAO

IPC: H03K17/96 ,  G06F3/044 ,  G06F3/02

Abstract: A touch sensor and a keyboard using the same are provided. The touch sensor includes a plurality of main sensor structures and a plurality of resilient structures. Any two adjacent ones of the main sensor structures have a gap therebetween. Each of the resilient structures is connected between two adjacent ones of the main sensor structures, and each of the resilient structures has a cross-sectional width that is less than a width of the gap.

公开(公告)号：US20210320659A1

公开(公告)日：2021-10-14

申请号：US16843570

申请日：2020-04-08

Applicant: PIXART IMAGING INC.

Inventor： CHE-CHIA HSU ,  YU-HAN CHEN ,  CHI-CHIEH LIAO

IPC: H03K17/98 ,  H03K17/96 ,  G06F3/02 ,  H01H3/12 ,  H01H13/705

Abstract: A key unit and a keyboard using the same are provided. The key unit includes a circuit board, an elastic element, a keycap, and a processing circuit. The circuit board includes a capacitance sensing circuit embedded therein, and the capacitance sensing circuit includes a pair of sensor electrodes. The elastic element is disposed on the circuit board. The keycap is moveably disposed above and spaced apart from the circuit board. The elastic element is disposed between the keycap and the circuit board so that the keycap moves between a non-depressed position and a depressed position with respect to the circuit board. The processing circuit is electrically connected to the pair of sensor electrodes to obtain a variation of a coupling capacitance between the pair of sensor electrodes and to determine whether the keycap is touched or depressed according to the variation of coupling capacitance.

公开(公告)号：US20210286462A1

公开(公告)日：2021-09-16

申请号：US17074697

申请日：2020-10-20

Applicant: PIXART IMAGING INC.

Inventor： SUNG-HAN WU ,  CHE-CHIA HSU

IPC: G06F3/041 ,  G06F3/044 ,  H03K17/96

Abstract: A touch keyboard includes a key set, a capacitive touch sensor, and a pressure sensing circuit. The capacitive touch sensor is coupled to the key set and is configured to generate a sensing capacitance. The pressure sensing circuit is coupled to the capacitive touch sensor, configured to generate a pressure sensing value, and specifically includes a cancellation circuit. The cancellation circuit is configured to generate a cancellation signal, and enable a capacitor voltage converter in the pressure sensing circuit to output an analog voltage signal according to the sensing signal being added with the cancellation signal, and the content of the sensing signal is the sensing capacitance generated by the capacitive touch sensor.