Capacitive control interfaces for domestic appliances

Patent metadata

Field	Value
Publication number	US-9503084-B2
Application number	US-201414526927-A
Country	US
Kind code	B2
Filing date	Oct 29, 2014
Priority date	Nov 12, 2013
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A capacitive control interface for a domestic appliance includes an outer layer configured to be pressed by a user, a first capacitive component, a second capacitive component facing and separated from the first capacitive component, a first layer of insulating material between the outer layer and the first capacitive component, and a second layer of insulating material beneath the first layer of insulating material and in contact with the first capacitive component, the second layer having a thru hole encompassing the second capacitive component, wherein the second capacitive component faces the first capacitive component at the thru hole, and wherein the outer layer is flexibly responsive to pressure and is configured to transfer a flexure to the first capacitive component.

First claim

What is claimed is:

1. A capacitive control interface for a domestic appliance, comprising:
a metal outer layer configured to be pressed by a user;
a first capacitive component;
a plurality of second capacitive components facing and separated from the first capacitive component;
a first layer of insulating material between the metal outer layer and the first capacitive component; and
a second layer of insulating material beneath the first layer of insulating material and in contact with the first capacitive component, the second layer having a plurality of thru holes each encompassing one of the plurality of second capacitive components;
wherein the plurality of second capacitive components face the first capacitive component at the plurality of thru holes; and
wherein the metal outer layer and the first layer of insulating material extend over the plurality of second capacitive components and are flexibly responsive to pressure and configured to transfer a flexure to the first capacitive component.

2. The capacitive control interface as defined in claim 1 , further comprising a bottom layer to which is affixed the plurality of second capacitive components, wherein the first insulating layer is affixed to a bottom face of the metal outer layer and to a top face of the first capacitive component, and wherein the second insulating layer is affixed to a bottom face of the first capacitive component and to the bottom layer.

3. The capacitive control interface as defined in claim 2 , wherein the bottom layer comprises a printed circuit.

4. The capacitive control interface as defined in claim 3 , wherein the printed circuit is configured to sense a change in at least one of a capacitance or an inductance due to a flexure of the metal outer layer being conveyed through the first insulating layer and first capacitive component.

5. The capacitive control interface as defined in claim 1 , wherein the first capacitive component comprises a flat element.

6. The capacitive control interface as defined in claim 1 , wherein the first capacitive component is formed by depositing a metal layer on a bottom face of the first layer of insulating material.

7. The capacitive control interface as defined in claim 1 , wherein the first layer of insulating material and the first capacitive component are configured to be yielding and flexible at the thru holes of the second layer of insulating material.

8. The capacitive control interface as defined in claim 1 , further comprising a plurality of areas of control of the domestic appliance, wherein the second insulating layer comprises the thru holes for respective ones of the areas of control.

9. A method of making a capacitive control interface for a domestic appliance to minimize electrostatic discharges, the method comprising:
providing a metal outer layer configured to be pressed by a user;
adhering a first layer of insulating material to the metal outer layer;
adhering a first capacitive component to the first layer of insulating material;
fixing a second layer of insulating material beneath the first layer of insulating material and contacting the first capacitive component, the second layer having a plurality of thru holes each encompassing a second capacitive component facing and seperated from the first capacitive component; and
wherein the metal outer layer and the first layer of insulating material extend over the second capacitive component of each of the plurality of thru holes and are flexibly responsive to pressure and configured to transfer a flexure to the first capacitive component.

Assignees

• Whirlpool Co

Inventors

• Sergi Leonardo

Classifications

• H03K17/962 Primary

  Capacitive touch switches · CPC title

• H03K2217/960765

  Details of shielding arrangements · CPC title

• H03K17/98

  having a plurality of control members, e.g. keyboard · CPC title

• H03K17/9622 Primary

  using a plurality of detectors, e.g. keyboard · CPC title

• H03K2017/9613

  using two electrodes per touch switch · CPC title