Capacitive switch

• US 10,680,610 B2
• Filed: 05/16/2017
• Issued: 06/09/2020
• Est. Priority Date: 05/17/2016
• Status: Active Grant

• Current Assignee: Sambo Motors Co., Ltd.
• Original Assignee: Sambo Motors Co., Ltd.
• Inventors: Kim, Jung Kyu, Seo, Tae In, Lee, Yong Hee
• Primary Examiner(s): Leon, Edwin A.
• Application Number:
  US16/302,395
• Publication Number:
  US 20190312578A1
• Time in Patent Office: 1,120 Days
• Field of Search: 200600
• CPC Class Codes: G06F 3/0414 using force sensing means to determine a position
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: H03K 17/962 Capacitive touch switches
• CPC Class Codes: H03K 17/975 using a capacitive movable element
• CPC Class Codes: H03K 2017/9602 characterised by the type or shape of the sensing electrodes
• CPC Class Codes: H03K 2217/96054 Double function: touch detection combined with detection of a movable element
• CPC Class Codes: H03K 2217/960755 Constructional details of capacitive touch and proximity switches
• CPC Class Codes: H03K 2217/96076 with spring electrode
• CPC Class Codes: H03K 2217/96077 comprising an electrode which is floating

Abstract

A capacitive switch according to an embodiment of the present invention includes a switch structure having a first electrode pattern; a substrate having a second electrode pattern and an integrated circuit unit; and an elastic body interposed between the switch structure and the substrate, wherein the integrated circuit unit generates a first output signal by detecting a change in capacitance caused by a user touch input operation through the first electrode pattern, the elastic body, and the second electrode pattern, and generates a second output signal by detecting a change in capacitance caused by a user push input operation.

Claims

1. A capacitive switch comprising:

a switch structure having a first electrode pattern;

a substrate having a second electrode pattern and an integrated circuit unit; and

an elastic body interposed between the switch structure and the substrate,

wherein the integrated circuit unit generates a first output signal by detecting a change in capacitance caused by a user touch input operation through the first electrode pattern, the elastic body, and the second electrode pattern, and generates a second output signal by detecting a change in capacitance caused by a user push input operation,

wherein the switch structure comprises;

a cap portion;

a support portion configured to support the cap portion; and

guide portion configured to guide a moving path of the support portion according to the user push input operation, and

wherein a portion of the first electrode pattern extends from an upper surface of the support portion to a lower surface along a side surface of the support portion.

2. The capacitive switch of claim 1, wherein the first electrode pattern is formed on the support portion and the guide portion, and

a portion of the first electrode pattern extends from the upper surface of the support portion to a lower surface of the guide portion along a side surface and a lower surface of the support portion.

3. The capacitive switch of claim 2, wherein a portion of the second electrode pattern is formed on the elastic body and faces the portion of the first electrode pattern formed on a lower surface of the guide portion with a gap.

4. The capacitive switch of claim 1, wherein a portion of the first electrode pattern is formed on a bottom surface of the switch structure, and

another portion of the first electrode pattern is formed on the elastic body and contacts the portion of the first electrode pattern formed on the bottom surface of the switch structure.

5. The capacitive switch of claim 1, wherein the user touch input operation does not involve a physical change of the elastic body, and

the user push input operation involves a physical change of the elastic body.

6. The capacitive switch of claim 1, wherein the first electrode pattern is formed directly on the switch structure by a laser direct structuring process or a multiple injection process.

7. The capacitive switch of claim 1, wherein the capacitive switch further comprises a cover member covering at least a portion of an exposed surface of the first electrode pattern.