Elastomer suspension with actuation functionality and sensing functionality

Patent metadata

Field	Value
Publication number	US-10331216-B1
Application number	US-201815885501-A
Country	US
Kind code	B1
Filing date	Jan 31, 2018
Priority date	Jan 31, 2018
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

A haptic-enabled user interface device comprising a user input component, an elastomer suspension, a signal generating circuit, a signal sensing circuit, one or more switches, and a control unit is presented. The elastomer suspension is formed by at least one stack that includes an elastomeric layer, wherein the at least one stack forms at least one capacitor. The control unit is configured, in an actuation mode, to cause the one or more switches to electrically connect the signal generating circuit to the at least one capacitor and to electrically disconnect the signal sensing circuit from at least one capacitor, and to cause the signal generating circuit to apply a drive signal to the at least one capacitor. The control unit is further configured, in a sensing mode, to cause the one or more switches to electrically connect the signal sensing circuit to the at least one capacitor.

First claim

What is claimed is:

1. A haptic-enabled user interface device, comprising:
a user input component;
a base for supporting the user input component;
an elastomer suspension for suspending the user input component on the base, such that the user input component does not directly contact the base, wherein the elastomer suspension is formed by at least one stack that includes an elastomeric layer of an elastomer material and includes a pair of electrodes on opposite sides of the elastomeric layer, wherein the at least one stack forms at least one capacitor;
a signal generating circuit;
a signal sensing circuit;
one or more switches configured to electrically connect and to disconnect the signal sensing circuit and the signal generating circuit from the at least one capacitor; and
a control unit in communication with the signal generating circuit, the signal sensing circuit, and the one or more switches, wherein the control unit is configured,
in an actuation mode, to cause the one or more switches to electrically connect the signal generating circuit to the at least one capacitor and to electrically disconnect the signal sensing circuit from at least one capacitor, and to cause the signal generating circuit to apply a first signal as a drive signal to the at least one capacitor, wherein the drive signal causes relative movement of the pair of electrodes toward each other so as to generate a haptic effect, and
in a sensing mode, to cause the one or more switches to electrically connect the signal sensing circuit to the at least one capacitor, and to determine, based on a second signal sensed by the signal sensing circuit, whether a touch input has been received by the user input component of the haptic-enabled user interface device.

2. The haptic-enabled user interface device of claim 1 , wherein the control unit is configured, in the sensing mode, to determine whether the touch input has been received by determining, based on the second signal sensed by the signal sensing circuit, whether a capacitance of the at least one capacitor has changed from a defined or measured baseline capacitance by at least a defined threshold.

3. The haptic-enabled user interface device of claim 2 , wherein the control unit is configured, in the sensing mode, to cause the one or more switches to electrically disconnect the signal generating circuit from the at least one capacitor.

4. The haptic-enabled user interface device of claim 3 , wherein the control unit is configured, in the actuation mode, to electrically disconnect the signal sensing circuit from both electrodes of the pair of electrodes of the at least one capacitor, and is further configured, in the sensing mode, to electrically disconnect the signal generating circuit from both electrodes of the pair of electrodes of the at least one capacitor.

5. The haptic-enabled user interface device of claim 2 , wherein the control unit is configured to determine that a pressure-based touch input has been received at the user input component in response to a determination that there is a change in capacitance of the at least one capacitor.

6. The haptic-enabled user interface device of claim 5 , wherein the control unit is configured to determine that non-contact proximity of an object to the user input component of the haptic-enabled user interface device has been detected in response to detecting the change in capacitance of the at least one capacitor, wherein the pressure-based touch input is associated with the change in capacitance being in a first defined range relative to a measured or defined baseline capacitance, and wherein the non-contact proximity of an object is associated with the change in capacitance being in a second defined range relative to the measured or defined baseline capacitance.

7. The haptic-enabled user interface device of claim 1 , wherein the drive signal has an amplitude in a range of 500 V to 10 kV, and a frequency that is in a range of 10 Hz to 500 Hz.

8. The haptic-enabled user interface device of claim 1 , wherein the elastomer material is a polymer having a durometer that is in a range of shore 00-10 to shore A-50, and wherein each of the pair of electrodes is formed from a stretchable conductive material.

9. The haptic-enabled user interface device of claim 8 , wherein the elastomer material of the elastomeric layer includes at least one of polyisoprene, isobutylene, isoprene, polybutadiene, styrene-butadiene rubber, ethylene propylene rubber, polyacrylic rubber, or silicone rubber, and wherein the stretchable conductive material includes graphene.

10. The haptic-enabled user interface device of claim 1 , wherein the user input component is a button.

11. The haptic-enabled user interface device of claim 1 , wherein the haptic-enabled user interface device is a wearable device.

12. The haptic-enabled use interface device of claim 1 , wherein the at least one capacitor of the elastomer suspension comprises a plurality of stacks that form a plurality of respective capacitors, and wherein the signal sensing circuit is configured to receive respective signals from the plurality of capacitors, and is configured to determine location-based information for the touch input on a surface of the user input component based on the respective signals.

13. The haptic-enabled user interface device of claim 1 , wherein the at least one stack has a thickness that is in a range between 0.2 mm and 10 mm.

14. The haptic-enabled user interface device of claim 1 , wherein the elastomer suspension has a resonance frequency that is less than 500 Hz.

15. The haptic-enabled user interface device of claim 1 , wherein the elastomer suspension forms a seal between the user input component and the base.

16. The haptic-enabled user interface device of claim 1 , wherein the elastomer suspension further includes a piezoelectric layer of ceramic piezoelectric material in contact with at least one electrode of the pair of electrodes, and wherein the drive signal causes the piezoelectric layer to vibrate.

17. A haptic-enabled user interface device, comprising:
a user input component;
a base for supporting the user input component;
an elastomer suspension for suspending the user input component on the base, such that the user input component does not directly contact the base, wherein the elastomer suspension is formed by at least one stack that includes a piezoelectric layer of piezoelectric material, a pair of electrodes on opposite sides of the piezoelectric material, and an elastomeric layer of elastomer material in contact with at least one of the pair of electrodes;
a signal generating circuit;
a signal sensing circuit;
one or more switches configured to electrically connect and disconnect the signal sensing circuit and the signal generating circuit from at least a first electrode or a second electrode of the pair of electrodes; and
a control unit in communication with the signal generating circuit, the signal sensing circuit, and the one or more switches, wherein the control unit is configured,
in an actuation mode, to cause the one or more switches to electrically connect the signal generating circuit to at least one of the first electrode or the second electrode, to cause the one or more switches to electrically disconnect the signal sensing circuit from the at least one of the first electrode or the second electrode, and to cause the signal generating circuit to generate a first signal as a drive signal that causes the piezoelectric layer to vibrate,
in a sensing mode, to cause the one or more switches to electrically connect the signal

Assignees

• Immersion Corp

Inventors

• Khoshkava Vahid
• Cruz-Hernandez Juan Manuel
• Olien Neil T

Classifications

• G06F3/011

  Arrangements for interaction with the human body, e.g. for user immersion in virtual reality (blind teaching G09B21/00) · CPC title

• G06F3/0414

  using force sensing means to determine a position · CPC title

• G06F3/0338

  with detection of limited linear or angular displacement of an operating part of the device from a neutral position, e.g. isotonic or isometric joysticks · CPC title

• G06F2203/04105

  Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position · CPC title

• H03K17/962

  Capacitive touch switches · CPC title