Touch sensor and method for manufacturing same

• US 8,466,882 B2
• Filed: 04/27/2009
• Issued: 06/18/2013
• Est. Priority Date: 07/27/2007
• Status: Active Grant

• Current Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Original Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Inventors: Halsey, Eugene L. IV, Cherif, Mondher
• Primary Examiner(s): GIRARDI, VANESSA MARY
• Application Number:
  US12/430,323
• Publication Number:
  US 20090205879A1
• Time in Patent Office: 1,513 Days
• Field of Search: 200/600
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: H03K 17/9622 using a plurality of detectors, e.g. keyboard
• CPC Class Codes: H03K 2017/9602 characterised by the type or shape of the sensing electrodes
• CPC Class Codes: H03K 2217/960755 Constructional details of capacitive touch and proximity switches
• CPC Class Codes: H05K 3/4061 for via connections in inorganic insulating substrates
• CPC Class Codes: H05K 3/4069 for via connections in organic insulating substrates
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor
• CPC Class Codes: Y10T 29/49124 On flat or curved insulated base, e.g., printed circuit, etc.

Abstract

A touch sensor, such as a capacitive touch sensor, includes a substrate having at least one passageway established therethrough. A first conductive coating is established at a first surface of the substrate, and a conductive element is disposed at the substrate and at least partially through the passageway. The conductive element establishes conductive continuity between the first surface and second or opposite surface of the substrate. A thin sheet (such as a thin glass or plastic sheet) is disposed at and over the first surface of the substrate. The passageway may comprise multiple passageways established inboard of a perimeter edge of the substrate. The thin glass or plastic sheet may be laminated at or to the substrate.

Claims

1. A touch sensor comprising:

a substrate having a first surface and a second surface, said substrate having at least two passageways established through said substrate;

a first conductive coating established at said first surface of said substrate;

at least two conductive elements, each disposed at least partially through each respective one of said passageways of at said substrate and electrically connected to said first conductive coating, establishing conductive continuity between said first and second surfaces of said substrate and wherein said conductive elements are electrically isolated from one another at said second surface of said substrate; and

a thin sheet disposed at said first surface of said substrate.

2. The touch sensor of claim 1, wherein said touch sensor comprises a capacitive touch sensor.

3. The touch sensor of claim 1 further comprising at least two conductive connectors, each of said at least two conductive connectors being conductively connected to a portion of each respective one of said conductive elements at said second surface of said substrate.

4. The touch sensor of claim 1, wherein said at least two passageways comprise four passageways.

5. The touch sensor of claim 1, wherein said at least two passageways are established inboard of a perimeter edge of said substrate.

6. The touch sensor of claim 1, wherein said substrate is at least one chosen from a glass substrate and a plastic substrate.

7. The touch sensor of claim 1, wherein said substrate is a flexible plastic substrate, and wherein said conductive coating comprises a transparent conductive coating.

8. The touch sensor of claim 1, wherein said conductive coating comprises a transparent conductive coating.

9. The touch sensor of claim 1, wherein said thin sheet comprises one of a thin glass sheet and a thin plastic sheet.

10. The touch sensor of claim 1, wherein each of said conductive elements is disposed at least partially over said first surface proximate to said respective one of said passageways.

11. The touch sensor of claim 1, wherein each of said conductive elements is disposed at least partially over said second surface proximate to said respective one of said passageways.

12. The touch sensor of claim 1, wherein each of said conductive elements comprises a first conductive material disposed at said first surface and partially into said respective one of said passageways and a second conductive material disposed at said second surface and partially into said respective one of said passageways, said first and second conductive materials contacting one another in said respective one of said passageways to establish conductive continuity between said first and second surfaces of said substrate.

13. The touch sensor of claim 12, wherein said first conductive material and said second conductive material comprise silver material or silver paste.

14. A method of manufacturing a touch sensor, said method comprising:

providing a substrate having a first surface and a second surface;

establishing a conductive coating at said first surface of said substrate;

establishing at least two passageways through said substrate;

providing at least two conductive elements at said substrate, each of said conductive elements being disposed at least partially through each respective one of said passageways and being electrically connected to said first conductive coating, establishing conductive continuity between said first and second surfaces of said substrate and wherein said conductive elements are electrically isolated from one another at said second surface of said substrate; and

providing a thin sheet and attaching said thin sheet to said first surface of said substrate.

15. The method of claim 14, wherein attaching said thin sheet at said first surface of said substrate comprises laminating said thin sheet to said first surface of said substrate.

16. The method of claim 14, wherein said substrate is a glass substrate or a plastic substrate.

17. The method of claim 14, wherein said thin sheet is at least one chosen from a thin glass sheet and a thin plastic sheet.

18. The method of claim 14, wherein providing conductive elements comprises:

establishing at least two first conductive pads, each disposed at said first surface proximate to said respective one of said passageways and at least partially filling said respective one of said passageways with the conductive material of said first conductive pad;

establishing at least two second conductive pads, each disposed at said second surface proximate to said respective one of said passageways and at least partially filling said respective one of said passageways with the conductive material of said second conductive pad; and

wherein said conductive material of said second conductive pad contacts said conductive material of said first conductive pad to establish conductive continuity between said first and second pads at said first and second surfaces of said substrate.

19. The method of claim 18, wherein said first conductive pads and said second conductive pads comprise silver material or silver paste.

20. The method of claim 18, wherein said second conductive pads of each respective one of said at least two passageways are electrically isolated from one another at said second surface of said substrate.

21. The method of claim 18, further comprising attaching at least two conductive connectors, each of said at least two conductive connectors being conductively connected to a portion of a respective one of said second conductive pads at said second surface of said substrate.