Multi-action capacitive switch and methods of use

• US 9,780,781 B2
• Filed: 09/28/2010
• Issued: 10/03/2017
• Est. Priority Date: 09/28/2010
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Lee, Yun Sun, Hsu, Chin Feng
• Primary Examiner(s): Benlagsir, Amine
• Application Number:
  US12/892,113
• Publication Number:
  US 20120075486A1
• Time in Patent Office: 2,562 Days
• Field of Search: 341 33, 455566, 34820799
• CPC Class Codes: G06F 3/023 Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
• CPC Class Codes: H03K 17/962 Capacitive touch switches
• CPC Class Codes: H03K 2217/96054 Double function: touch detection combined with detection of a movable element
• CPC Class Codes: H04M 1/2747 Scrolling on a display
• CPC Class Codes: H04M 2250/22 including a touch pad, a touch sensor or a touch detector

Abstract

A multi-action capacitive switch comprising a capacitive sensing area in a surface, a plunger comprising conductive material, and a structure of flexible conductive material. A change in capacitance caused by the presence of a user'"'"'s finger travels from the capacitive sensing area, down the conductive material of the plunger, over the structure, and to a capacitive touch detector in contact with the structure. An actuation of the switch, for example by pressing, is detected by an actuation detector. In a handheld electronic device, a user may initiate a phone call using such a multi-action capacitive switch. The method includes displaying a list of phone numbers in response to detection of a user'"'"'s finger on a predetermined key and calling one of the numbers when the user actuates the predetermined key.

Claims

1. A multi-action capacitive switch device, comprising:

a surface comprising a capacitive sensing area and attached to a top portion of a plunger, the capacitive sensing area configured to detect a change in capacitance due to a presence of a finger;

the plunger comprising a conductive material, a top portion of the conductive material in contact with the capacitive sensing area;

a structure of flexible conductive material in contact with a bottom portion of the conductive material of the plunger;

a capacitive touch detector, the capacitive touch detector configured to detect the change in capacitance that transfers from the capacitive sensing area, down the conductive material, and to the structure of flexible conductive material;

an actuation detector,

wherein in a first configuration the structure of flexible conductive material is physically connected to the capacitive touch detector and generates a first input signal, and when the device is actuated, the plunger causing the structure of flexible conductive material to be in a second configuration to generate a second input signal, which is physically connected to the actuation detector; and

a processor, wherein the processor is configured to;

detect the first input signal;

in response to said detecting the first input signal, determining whether the second input signal is detected;

when both the first and the second input signals are detected, execute an actuation function;

when the first input signal is detected and the second input signal is not detected;

determining a duration of the change in capacitance associated with the first input signal;

comparing the duration of the change in capacitance with a threshold;

determining, based on the comparing, whether to execute a touch function or a tap function;

when the duration is longer than the threshold, execute the touch function; and

when the duration is not longer than the threshold, execute the tap function.

2. The device of claim 1, wherein the capacitive sensing area detects a touch and transfers the change in capacitance down the conductive material to the structure of flexible conductive material, and the structure of flexible conductive material transfers the change in capacitance to the capacitive touch detector.

3. The device of claim 1, wherein the plunger further comprises a nonconductive material housing the conductive material.

4. The device of claim 1, wherein the capacitive sensing area and the conductive material are a molded piece.

5. The device of claim 1, wherein the structure of flexible conductive material has a dome configuration.

6. The device of claim 5, wherein a ring of the conductive material connects the dome configuration to the capacitive touch detector.

7. The device of claim 1, wherein the flexible conductive material of the structure of flexible conductive material is metal.

8. The device of claim 1, wherein the capacitive touch detector and the actuation detector are located on or connected to a single printed circuit board.