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1. (WO2019048827) DISPLACEMENT SENSING
Nota: Texto obtenido mediante procedimiento automático de reconocimiento óptico de caracteres.
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CLAIMS

1. A sensing apparatus comprising:

a displacement sensor comprising capacitance measurement circuitry configured to provide a displacement sensor output signal indicative of a separation between a frame element and a displacement element movably mounted with respect to the frame element; a touch sensor comprising measurement circuitry configured to provide a touch sensor output signal indicative of when an object is determined to be touching the displacement element; and

a processing element configured to output a detection signal to indicate there is determined to be a displacement of the displacement element relative to the frame element in response to determining the touch sensor output signal indicates an object is touching the displacement element and a difference between the displacement sensor output signal and a baseline displacement sensor output signal exceeds a threshold value, wherein the baseline displacement sensor output signal is determined from the displacement sensor output signal during a time period defined by when the touch sensor output signal initially indicates the object is touching the displacement element.

2. The sensing apparatus of claim 1 , wherein the time period ends when the touch sensor output signal initially indicates the object is touching the displacement element.

3. The sensing apparatus of claim 1 or 2, wherein the baseline displacement sensor output signal is set to the current value for the displacement sensor output signal when the touch sensor output signal initially indicates the object is touching the displacement element.

4. The sensing apparatus of claim 1 or 2, wherein the baseline displacement sensor output signal is set to an average of values for the displacement sensor output signal during the time period.

5. The sensing apparatus of any preceding claim, wherein the processing element is further configured to output a detection signal to indicate there is no longer determined to be a displacement of the displacement element relative to the frame element in response to determining the touch sensor output signal indicates there is no longer an object touching the displacement element.

6. The sensing apparatus of any preceding claim, wherein the processing element is further configured to output a detection signal to indicate there is no longer determined to be a displacement of the displacement element relative to the frame element in response to determining the difference between the displacement sensor output signal and the baseline displacement sensor output no longer exceeds the threshold value.

7. The sensing apparatus of any preceding claim, wherein displacement sensor comprises a reference electrode and a deformable electrode arranged between the displacement element and the frame element, wherein the deformable electrode has a contact surface facing the reference electrode and insulated therefrom by an insulator layer, and wherein at least part of the contact surface is inclined relative to an opposing surface of the reference electrode such that when the deformable electrode is compressed by a displacement of the displacement element towards the frame element there is a reduction in volume between the contact surface and the opposing surface of the reference electrode, and wherein the output signal from the capacitance measurement circuitry for the displacement sensor comprises an indication of a capacitive coupling between the deformable electrode and the reference electrode measured by the capacitance measurement circuitry for the displacement sensor.

8. The displacement sensor of claim 7, wherein the deformable electrode is sized so as to be in compression between the displacement element and the frame element when the displacement element is in its rest position with no displacement load applied.

9. The method of any preceding claim, wherein the measurement circuitry for the touch sensor comprises capacitance measurement circuitry configured to measure a capacitive coupling associated with one or more touch sensor electrodes on the displacement element.

10. The method of any claim, wherein the measurement circuitry for the touch sensor is configured to provide the touch sensor output signal indicative of when an object is determined to be touching the displacement element in response to determining a difference between a measured capacitive coupling associated with the one or more touch sensor electrodes and a baseline for the capacitive coupling associated with the one or more touch sensor electrodes exceeds a predetermined touch detection threshold.

11. An apparatus comprising the sensing apparatus of any preceding claim.

12. A method comprising:

using a displacement sensor comprising capacitance measurement circuitry to obtain a displacement sensor output signal indicative of a separation between a frame element and a displacement element movably mounted with respect to the frame element;

using a touch sensor comprising measurement circuitry to obtain a touch sensor output signal indicative of when an object is determined to be touching the displacement element; and

outputting a detection signal to indicate there is determined to be a displacement of the displacement element relative to the frame element in response to determining the touch sensor output signal indicates an object is touching the displacement element and a difference between the displacement sensor output signal and a baseline displacement sensor output signal exceeds a threshold value, wherein the baseline displacement sensor output signal is determined from the displacement sensor output signal during a time period defined by when the touch sensor output signal initially indicates the object is touching the displacement element.