公开(公告)号：US11942285B2

公开(公告)日：2024-03-26

申请号：US18051954

申请日：2022-11-02

Applicant: Apple Inc.

Inventor： Chia Chi Wu ,  Michael Vosgueritchian ,  Ming Gao ,  Nan Chen ,  Vyom Sharma ,  Wenhao Wang

IPC: H01H13/84 ,  G01L1/18 ,  G01L1/22 ,  H01H13/7065

CPC classification number: H01H13/84 ,  G01L1/18 ,  G01L1/2287 ,  H01H13/7065 ,  H01H2221/002 ,  H01H2300/03

Abstract: An electronic device has a keyboard with an internal membrane. The membrane has a set of strain gauges configured to respond to a key press, such as when a collapsible dome collapses into contact with the membrane. The strain gauges are connected in a half Wheatstone bridge configuration and are positioned on the membrane in order to limit effects of temperature and subtle flexure of the membrane. The strain gauges are also configured to magnify detection of a resistance differential when a keycap is pressed with sufficient force.

公开(公告)号：US20230298834A1

公开(公告)日：2023-09-21

申请号：US18051954

申请日：2022-11-02

Applicant: Apple Inc.

Inventor： Chia Chi Wu ,  Michael Vosgueritchian ,  Ming Gao ,  Nan Chen ,  Vyom Sharma ,  Wenhao Wang

IPC: H01H13/84 ,  H01H13/7065 ,  G01L1/18 ,  G01L1/22

CPC classification number: H01H13/84 ,  H01H13/7065 ,  G01L1/18 ,  G01L1/2287 ,  H01H2300/03 ,  H01H2221/002

Abstract: An electronic device has a keyboard with an internal membrane. The membrane has a set of strain gauges configured to respond to a key press, such as when a collapsible dome collapses into contact with the membrane. The strain gauges are connected in a half Wheatstone bridge configuration and are positioned on the membrane in order to limit effects of temperature and subtle flexure of the membrane. The strain gauges are also configured to magnify detection of a resistance differential when a keycap is pressed with sufficient force.

公开(公告)号：US11501933B2

公开(公告)日：2022-11-15

申请号：US16586280

申请日：2019-09-27

Applicant: Apple Inc.

Inventor： Chia Chi Wu ,  Michael Vosgueritchian ,  Ming Gao ,  Nan Chen ,  Vyom Sharma ,  Wenhao Wang

IPC: H01H13/84 ,  H01H13/7065 ,  G01L1/18 ,  G01L1/22

Abstract: An electronic device has a keyboard with an internal membrane. The membrane has a set of strain gauges configured to respond to a key press, such as when a collapsible dome collapses into contact with the membrane. The strain gauges are connected in a half Wheatstone bridge configuration and are positioned on the membrane in order to limit effects of temperature and subtle flexure of the membrane. The strain gauges are also configured to magnify detection of a resistance differential when a keycap is pressed with sufficient force.

公开(公告)号：US20210098210A1

公开(公告)日：2021-04-01

申请号：US16586280

申请日：2019-09-27

Applicant: Apple Inc.

Inventor： Chia Chi Wu ,  Michael Vosgueritchian ,  Ming Gao ,  Nan Chen ,  Vyom Sharma ,  Wenhao Wang

IPC: H01H13/84 ,  H01H13/7065 ,  G01L1/22 ,  G01L1/18

Abstract: An electronic device has a keyboard with an internal membrane. The membrane has a set of strain gauges configured to respond to a key press, such as when a collapsible dome collapses into contact with the membrane. The strain gauges are connected in a half Wheatstone bridge configuration and are positioned on the membrane in order to limit effects of temperature and subtle flexure of the membrane. The strain gauges are also configured to magnify detection of a resistance differential when a keycap is pressed with sufficient force.