Capacitor-sensor

• US 5,150,759 A
• Filed: 10/29/1990
• Issued: 09/29/1992
• Est. Priority Date: 10/29/1990
• Status: Expired due to Fees

• Current Assignee: John S. Borchard
• Original Assignee: John S. Borchard
• Inventors: Borchard, John S.
• Primary Examiner(s): MILLER JR, GEORGE
• Application Number:
  US07/604,174
• Time in Patent Office: 701 Days
• Field of Search: 177/210 C, 361/283, 73/718, 73/862.52
• US Class Current: 177/210.00C
• CPC Class Codes: G01G 3/12 wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
• CPC Class Codes: G01G 3/14 measuring variations of electrical resistance G01G3/13 takes precedence
• CPC Class Codes: G01G 7/06 by electrostatic action

Abstract

An improved capacitor-sensor formed between two rigid, closely-spaced and facing, first and second plates, each with a facing and nonfacing surface and with specific facing electrode patterns on the plates forming a plurality of capacitors sensitive to displacement between the plates, which will eliminate asymmetrical overlap patterns and horizontal motion sensitivity. The first and second plate electrode patterns each have three, equispaced, identical, circular conductive regions on their facing surfaces. The diameters of the first plate circular conductive regions are less than the diameters of the circular conductive regions of the second plate. Electrical leads and interconnections are so arranged that overlap between leads and interconnections on opposing plates is avoided.

Claims

1. An improved capacitor-sensor formed between two rigid, closely-spaced and facing, first and second plates, each with a perimeter, facing and nonfacing surface and with specific electrode patterns on each facing surface thereby forming a plurality of capacitors sensitive to displacement between the plates, comprising:

a plurality of separate conductive regions on the facing surface of the second plate;

a plurality of separate conductive regions on the facing surface of the first plate, corresponding to and facing the second plate conductive regions; and

wherein one of each corresponding regions is a subset of the other.

2. An improved capacitor-sensor as recited in claim 1 wherein:

an electrical lead extends from each conductive region on the second plate to the perimeter of said second plate; and

each conductive region of the first plate is electrically interconnected.

3. An improved capacitor-sensor as recited in claim 2 wherein the electrical leads and interconnections are so arranged that overlap between leads and interconnections on opposing plates is avoided.

4. An improved capacitor-sensor as recited in claim 3 wherein:

said second plate conductive regions are identical and equispaced about said plate facing surface; and

said first plate conductive regions are identical and equispaced about said plate facing surface.

5. An improved capacitor-sensor as recited in claim 4 wherein said conductive regions are circular.

6. An improved capacitor-sensor as recited in claim 5 wherein each said first plate conductive region is broken into a plurality of concentric, electrically conductive and interconnected rings.

7. An improved capacitor-sensor as recited in claim 6 wherein each said first plate conductive region has a center and said plurality of concentric rings have decreasing widths as each is positioned further from said center.

8. An improved capacitor-sensor as recited in claim 5 wherein each said first plate conductive region has a center electrode portion and a plurality of identical, elongated conductor elements radiating outward from said center electrode portion.

9. An improved capacitor-sensor as recited in claim 5 wherein each said first plate conductive region has conductive spot portions removed from the region in a density increasing toward the edge of said region.

10. An improved capacitor-sensor as recited in claim 9 wherein said non-conductive spots are so formed in said region that electrical connection remains between and among the remaining conductor material.

11. An improved capacitor-sensor as recited in claim 1 wherein said second plate contains one or more feedthrough holes through which electrical leads from said conductive regions may be passed to the nonfacing surface of said second plate.

12. An improved capacitor-sensor as recited in claim 11 wherein:

each conductive region of the first plate is electrically interconnected, and

said first plate contains a feedthrough hole through which an electrical lead is passed to the nonfacing surface of said first plate.

13. An improved capacitor-sensor as recited in claim 12 wherein the electrical leads and interconnections are so arranged that overlap between leads and interconnections on opposing plates is avoided.

14. An improved capacitor-sensor as recited in claim 13 wherein:

said second plate conductive regions are identical and equispaced about said plate facing surface; and

said first plate conductive regions are identical and equispaced about said plate facing surface.

15. An improved capacitor-sensor as recited in claim 14 wherein said conductive regions are circular.

16. An improved capacitor-sensor as recited in claim 15 wherein each said first plate conductive region is broken into a plurality of concentric, electrically conductive and interconnected rings.

17. An improved capacitor-sensor as recited in claim 16 wherein each said first plate conductive region has a center and said plurality of concentric rings have decreasing widths as each is positioned further from said center.

18. An improved capacitor-sensor as recited in claim 15 wherein each said first plate conductive region has a center electrode portion and a plurality of identical, elongated conductor elements radiating outward from said center electrode portion.

19. An improved capacitor-sensor as recited in claim 15 wherein each said first plate conductive region has conductive spot portions removed from the region in a density increasing toward the edge of said region.

20. An improved capacitor-sensor as recited in claim 19 wherein said non-conductive spots are so formed in said region that electrical connection remains between and among the remaining conductor material.

21. An improved capacitor-sensor formed between two rigid, closely-spaced and facing, first and second plates, each with a facing surface and with one or more electrode patterns on each facing surface thereby forming one or more capacitors sensitive to displacement between the plates, comprising:

one or more separate conductive regions on the facing surface of the second plate;

one or more separate conductive regions on the facing surface of the first plate, corresponding to and facing the second plate conductive regions, wherein each of said first plate conductive regions is broken into a plurality of concentric, electrically conductive and interconnected rings; and

wherein one of each corresponding regions is a subset of the other.

22. An improved capacitor-sensor as recited in claim 21 wherein each of said first plate conductive regions has a center and said plurality of concentric rings have decreasing widths as each is positioned further from said center.

23. An improved capacitor-sensor formed between two rigid, closely-spaced and facing, first and second plates, each with a facing surface and with one or more electrode patterns on each facing surface thereby forming one or more capacitors sensitive to displacement between the plates, comprising:

one or more separate conductive regions on the facing surface of the second plate;

one or more separate conductive regions on the facing surface of the first plate, corresponding to and facing the second plate conductive regions, wherein each of said first plate conductive regions has a center electrode portion and a plurality of identical, elongated conductor elements radiating outward from said center electrode portion; and

wherein one of each corresponding regions is a subset of the other.

24. An improved capacitor-sensor formed between two rigid, closely-spaced and facing, first and second plates, each with a facing surface and with one or more electrode patterns on each facing surface thereby forming one or more capacitors sensitive to displacement between the plates, comprising:

one or more separate conductive regions on the facing surface of the second plate;

one or more separate conductive regions on the facing surface of the first plate, corresponding to and facing the second plate conductive regions, wherein each of said first plate conductive regions has conductive spot portions removed from the region in a density increasing toward the edge of said region; and

wherein one of each corresponding regions is a subset of the other.

25. An improved capacitor-sensor as recited in claim 24 wherein said non-conductive spots are so formed in said region that electrical connection remains between and among the remaining conductor material.

26. An improved capacitor-sensor formed between two rigid, closely-spaced and facing, first and second plates, each with a facing surface and with one or more electrode patterns on each facing surface thereby forming one or more capacitors sensitive to displacement between the plates, comprising:

one or more separate conductive regions on the facing surface of the second plate;

one or more separate conductive regions on the facing surface of the first plate, corresponding to and facing the second plate conductive regions; and

wherein each of said conductive regions on at least one facing surface is broken into a plurality of concentric, electrically conductive rings with staggered electrical inter-ring connections.

27. An improved capacitor-sensor formed between two rigid, closely-spaced and facing, first and second plates, each with a facing surface and with one or more electrode patterns on each facing surface thereby forming one or more capacitors sensitive to displacement between the plates, comprising:

one or more separate conductive regions on the facing surface of the second plate;

one or more separate conductive regions on the facing surface of the first plate, corresponding to and facing the second plate conductive regions;

wherein each of said conductive regions on at least one facing surface is broken into a plurality of concentric, electrically conductive and interconnected rings; and

wherein each of said broken conductive regions has a center and said plurality of concentric rings have decreasing widths as each is positioned further from said center.

28. An improved capacitor-sensor formed between two rigid, closely-spaced and facing, first and second plates, each with a facing surface and with one or more electrode patterns on each facing surface thereby forming one or more capacitors sensitive to displacement between the plates, comprising:

one or more separate conductive regions on the facing surface of the second plate;

one or more separate conductive regions on the facing surface of the first plate, corresponding to and facing the second plate conductive regions; and

wherein each of said conductive regions on at least one facing surface has a center electrode portion and a plurality of identical, elongated conductor elements radiating outward from said center electrode portion.

29. An improved capacitor-sensor formed between two rigid, closely-spaced and facing, first and second plates, each with a facing surface and with one or more electrode patterns on each facing surface thereby forming one or more capacitors sensitive to displacement between the plates, comprising:

one or more separate conductive regions on the facing surface of the second plate;

one or more separate conductive regions on the facing surface of the first plate, corresponding to and facing the second plate conductive regions; and

wherein each of said conductive regions on at least one facing surface has conductive spot portions removed from the region in a density increasing toward the edge of said region.

30. An improved capacitor-sensor as recited in claim 29 wherein said non-conductive spots are so formed in said region that electrical connection remains between and among the remaining conductor material.