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Cylinder Layout for Silicone Layer in Force Sensor

IP.com Disclosure Number: IPCOM000237635D
Publication Date: 2014-Jun-27
Document File: 2 page(s) / 41K

Publishing Venue

The IP.com Prior Art Database

Related People

Felix Schmitt: INVENTOR [+2]

Abstract

Proximity sensor devices (also commonly called touch sensor devices) are widely used in a variety of electronic systems. A proximity sensor device typically includes a sensing region, often demarked by a surface in which input objects can be detected. The proximity sensor can be used to enable control of an associated electronic system. Some proximity sensors have been implemented with additional ability to detect and determine force applied to a surface of the sensor. For example, a capacitive sensor having several arrays of sensor electrodes may provide force information about user input in response to a change in capacitance between a layer of receiver electrodes and transmitter electrodes. The layers of receiver and transmitter electrodes may be separated by a compressible medium. Touch and force sensing are achieved by splitting up the receivers in two layers. One layer of receivers is located above the transmitters and senses capacitive touch, as is the case with other traditional sensors. The second layer of receivers is located below the transmitters. A compressible medium is placed between the transmitters and the second layer of receivers. When the sensor is pressed, the compressible medium is compressed and the capacitance between receivers and transmitters changes, thusly allowing capacitive force sensing. In some embodiments, an elastic silicone rubber sheet is used as the compressible medium that provides for sufficient deflection of the input surface for the measurement of a change in capacitance due to force. As described herein, a layout of a hexagonal grid and spacing between cylinders can increase force sensitivity and improve sensing linearity as well as overall mechanical stability of the force sensor.

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Cylinder Layout for Silicone Layer in Force Sensor

Cylinder Layout for Silicone Layer in Force Sensor


1. Inventors: Felix Schmitt and Pascale Kallassi


2. Synaptics Incorporated, San Jose, CA, USA


3. Short Summary

Figure 1. Schematic of a cylinder layout of an elastic silicone sheet having raised structures

    Proximity sensor devices (also commonly called touch sensor devices) are widely used in a variety of electronic systems. A proximity sensor device typically includes a sensing region, often demarked by a surface in which input objects can be detected. The proximity sensor can be used to enable control of an associated electronic system. Some proximity sensors have been implemented with additional ability to detect and determine force applied to a surface of the sensor. For example, a capacitive sensor having several arrays of sensor electrodes may provide force information about user input in response to a change in capacitance between a layer of receiver electrodes and transmitter electrodes. The layers of receiver and transmitter electrodes may be separated by a compressible medium. Touch and force sensing are achieved by splitting up the receivers in two layers.

    One layer of receivers is located above the transmitters and senses capacitive touch, as is the case with other traditional sensors. The second layer of receivers is located below the transmitters. A compressible medium is placed between the transmitters and the second layer of receivers. When the sensor is pressed, the compressible medium is compressed and the capacitance between receivers and transmitters changes, thusly allowing capacitive force sensing.

    In some embodiments, an elastic silicone rubber sheet is used as the compressible medium that provides for sufficient deflection of the input surface for the measurement of a change in capacitance due to force. As described herein, a layout of a hexagonal grid and spacing between cylinders can

Copyright © 2014 Synaptics Incorporated, All Rights Reserved.

Felix Schmitt

60°

Page: 1 of 2

Information contained in this publication is provided as-is, with no express or implied warranties, including any warranty of merchantability, fitness for any particular purpose, or non-infringement. Synaptics Incorporated assumes no liability whatsoever for any use of the information contained herein, including any liability for intellectual property infringement. This publication conveys no express or implied licenses to any intellectual property rights belonging to Synaptics or any other party. Synaptics may, from time to time and at its sole option, update the information contained herein without notice.


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Cylinder Layout for Silicone Layer in Force Sensor

increase force sensitivity and improve sensing linearity as well as overall mechanical stability of the force sensor.


4. Some Problems Solved

Examples of some of the problems addressed by the invention include:

    In previous embod...