SWITCH ARRAYS AND SYSTEMS EMPLOYING THE SAME TO ENHANCE SYSTEM RELIABILITY

• US 20070278082A1
• Filed: 06/01/2007
• Published: 12/06/2007
• Est. Priority Date: 09/02/2005
• Status: Active Grant

• Current Assignee: Almax Manufacturing Corporation
• Original Assignee: White Electronic Designs, Corp. (Microchip Technology Incorporated)
• Inventors: Parkinson, Wayne
• Granted Patent: US 7,439,465 B2
• Time in Patent Office: Days
• US Class Current: 200/512
• CPC Class Codes: H01H 13/78 characterised by the contacts or the contact sites
• CPC Class Codes: H01H 13/785 characterised by the material of the contacts, e.g. conductive polymers
• CPC Class Codes: H01H 13/79 characterised by the form of the contacts, e.g. interspersed fingers or helical networks
• CPC Class Codes: H01H 2203/02 Interspersed fingers
• CPC Class Codes: H01H 2203/022 Helical networks
• CPC Class Codes: H01H 2227/006 Spacer
• CPC Class Codes: H01H 2227/036 Minimise height
• CPC Class Codes: H01H 2229/004 Conductive ink
• CPC Class Codes: H01H 2239/01 combined with other elements on the same substrate

Abstract

An input system is delineated comprising an array of touch regions. At least one touch region is aligned with a sensing structure. The sensing structure comprises a first conductive region; a second conductive region aligned with the first conductive region, the second conductive region including a first conductive pattern forming a first switch terminal and a second conductive pattern forming a second switch terminal, the first conductive pattern separated by a space from the second conductive pattern; and a third conductive region between the first conductive region and the second conductive region, the third conductive region electrically coupling the first switch terminal to the second switch terminal to provide a first indication when the switch is open and a second indication when the switch is closed. Also delineated is a control panel including a plurality of such switches, as well as an appliance including such a control panel.

Claims

1. An input system, comprising:

an array of touch regions, wherein at least one of the touch regions is aligned with a sensing structure for sensing a user input, the sensing structure comprising;

a first conductive region;

a second conductive region aligned with the first conductive region, the second conductive region including a first conductive pattern forming a first switch terminal and a second conductive pattern forming a second switch terminal, the first conductive pattern separated by a space from the second conductive pattern; and

a third conductive region between the first conductive region and the second conductive region, the third conductive region electrically coupling the first switch terminal to the second switch terminal to provide a first indication when the switch is open and a second indication when the switch is closed.

2. The input system of claim 1 wherein the first conductive region comprises a plurality of conductive members.

3. The input system of claim 2 wherein the conductive members are parallel to each other.

4. The input system of claim 2 wherein the plurality of conductive members comprises a first set of parallel members and a second set of parallel members, the first set being orthogonal to the second set.

5. The input system of claim 2 wherein the plurality of conductive members comprises a plurality of circular members arranged concentrically to each other.

6. The input system of claim 1 wherein the first conductive region comprises a conductive plate.

7. The input system of claim 2 wherein the first conductive pattern and the second conductive pattern form a plurality of interdigitated fingers.

8. The input system of claim 7 wherein the interdigitated fingers are orthogonal to the plurality of conductive members.

9. The input system of claim 1 wherein the first conductive pattern and the second conductive pattern form a plurality of spirals.

10. The input system of claim 1 wherein the third conductive region comprises a material applied over portions of the first conductive pattern and the second conductive pattern.

11. The input system of claim 10 wherein the material comprises an ink.

12. The input system of claim 11 wherein the ink comprises a carbon ink.

13. The input system of claim 1 wherein the first indication comprises an electrical resistance between the first terminal and the second terminal of greater than or equal to one Mega-ohm.

14. The input system of claim 1 wherein the second indication comprises an electrical resistance between the first terminal and the second terminal of less than one Mega-ohm.

15. The input system of claim 1 wherein electrical current flows between the first terminal and the second terminal whether the switch is open or closed.

16. The input system of claim 1 wherein a portion of the first conductive region contacts the third conductive region whether the switch is open or closed.

17. The input system of claim 1 wherein each touch region has an outline shape.

18. The input system of claim 17 wherein the outline shape includes one of a circular shape, a square shape, a rectangular shape and a trapezoidal shape.

19. The input system of claim 1 wherein the array of touch regions is linear, nonlinear or a combination thereof.

20. The input system of claim 1 wherein the array forms one of a closed pattern and an open pattern.

21. The input system of claim 20 wherein the closed pattern comprises a circular shape.

22. A control panel, comprising:

a first support layer;

a second support layer;

a spacer between the first support layer and the second support layer; and

an array of touch regions on one or more of the first support layer and the second support layer, wherein at least one of the touch regions is aligned with a sensing structure for sensing a user input, the sensing structure comprising a switch between the first support layer and the second support layer, the switch comprising;

a first conductive region;

a second conductive region aligned with the first conductive region, the second conductive region including a first conductive pattern forming a first switch terminal and a second conductive pattern forming a second switch terminal, the first conductive pattern separated by a space from the second conductive pattern; and

a third conductive region between the first conductive region and the second conductive region, the third conductive region electrically coupling the first switch terminal to the second switch terminal to provide a first indication when the switch is open and a second indication when the switch is closed.

23. The control panel of claim 22 wherein the spacer has a thickness of less than or equal to 0.012 inches.

24. The control panel of claim 22 wherein at least one of the first support layer and the second support layer has a thickness in the range of 0.005 inches to 0.030 inches.

25. The control panel of claim 22 further comprising:

means for measuring resistance across the plurality of switches; and

means for controlling an appliance in response to the measured resistance across one or more of the plurality of switches.

26. A system, comprising:

an appliance; and

a control panel coupled to the appliance for controlling the appliance, the control panel comprising;

a first support layer;

a second support layer;

a spacer between the first support layer and the second support layer; and

an array of touch regions on one or more of the first support layer and the second support layer, wherein at least one of the touch regions is aligned with a sensing structure for sensing a user input, the sensing structure comprising a switch between the first support layer and the second support layer, the switch comprising;

a first conductive region;

a second conductive region aligned with the first conductive region, the second conductive region including a first conductive pattern forming a first switch terminal and a second conductive pattern forming a second switch terminal, the first conductive pattern separated by a space from the second conductive pattern; and

a third conductive region between the first conductive region and the second conductive region, the third conductive region electrically coupling the first switch terminal to the second switch terminal to provide a first indication when the switch is open and a second indication when the switch is closed.

27. The system of claim 26 wherein the spacer has a thickness of less than or equal to 0.012 inches.

28. The system of claim 26 wherein at least one of the first support layer and the second support layer has a thickness in the range of 0.005 inches to 0.030 inches.

29. The system of claim 26 further comprising:

means for measuring resistance across the plurality of switches; and

means for controlling the appliance in response to the measured resistance across one or more of the plurality of switches.