- Patent Title: Temperature compensating sensor having a compliant layer separating independent force sensing substrates and sense circuitry to obtain a relative measure between the force sensing substrates
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Application No.: US15633187Application Date: 2017-06-26
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Publication No.: US10466829B2Publication Date: 2019-11-05
- Inventor: Sinan Filiz , James E. Pedder , Charley T. Ogata , John Stephen Smith , Dhaval Chandrakant Patel , Shin John Choi , Brian Q. Huppi , Christopher J. Butler , Martin P. Grunthaner
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Brownstein Hyatt Farber Schreck, LLP
- Main IPC: G06F3/041
- IPC: G06F3/041 ; G06F3/044 ; G06F3/045 ; G01L1/16 ; G01L1/18 ; G01L1/20 ; G01L1/00
Abstract:
An optical force sensor that may compensate for environmental effects, including, for example, variations in temperature of the device or the surroundings. In some examples, two force-sensitive layers are separated by a compliant layer. The relative electrical response of the two force-sensitive layers may be used to compute an estimate of the force of a touch that reduces the effect of variations in temperature. In some examples, piezoelectric films having anisotropic strain properties are used to reduce the effects of temperature.
Public/Granted literature
- US20170300161A1 Temperature Compensating Force Sensor Having a Complliant Layer Public/Granted day:2017-10-19
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