System for protecting a person from the effects of ESD

• US 6,873,516 B1
• Filed: 08/22/2001
• Issued: 03/29/2005
• Est. Priority Date: 05/14/2001
• Status: Expired due to Fees

• Current Assignee: Barry M. Epstein
• Original Assignee: Barry M. Epstein
• Inventors: Epstein, Barry M.
• Primary Examiner(s): Jackson, Stephen W.
• Assistant Examiner(s): Nguyen, Danny
• Application Number:
  US09/934,047
• Time in Patent Office: 1,315 Days
• Field of Search: 361/212, 361/213, 361/214, 361/215, 361/216, 361/217, 361/218, 361/219, 361220-227, 361/56
• US Class Current: 361/220
• CPC Class Codes: A61N 1/14 Leading-off electric charges, e.g. by earthing carrying-off electrostatic charges, in general H05F3/00
• CPC Class Codes: H05F 3/02 by means of earthing connections

Abstract

Uncomfortable, disturbing or harmful electrostatic discharge is prevented or reduced by a system which reduces static charges on a person on a periodic basis as the charge is built up. Points of contact are provided which correspond to points the user will contact either by touch or by time-extended contact or continuously in the normal course of operation. The system can be used in mouse pads, the mouse itself, a keyboard, or headphones or earpieces or the like.

Claims

1. A system for protecting a person or equipment from surprise, damaging or uncomfortable electrostatic discharge (ESD) comprising:

a ground system having stray inductance and resistance;

a plurality of devices electrically connected to said ground system;

an electrostatic discharge contact element on at least one device of said plurality of devices;

a resistor element electrically connected to said contact element; and

an inductor element electrically interposed between said contact element and said ground system and which is connected to said ground system at a connection location.

2. The system defined in claim 1 wherein said resistor element is physically located closely adjacent to said contact element and is in series with said inductor element.

3. The system defined in claim 2 further including a second resistor element in series with said inductor element.

4. The system defined in claim 3 wherein said inductor element is physically located between said resistor element and said second resistor element and said resistor element is physically located between said contact element and said inductor element.

5. The system defined in claim 2 wherein said resistor element is located within one foot of said contact element.

6. The system defined in claim 1 further including a second resistor element, and said second resistor element having a value of at least one megohm and is in series with said inductor element.

7. The system defined in claim 1 further including a capacitor in series with said resistor element.

8. The system defined in claim 1 further including a transistor in series with said resistor element.

9. The system defined in claim 1 further including a second electrostatic discharge contact element.

10. The system defined in claim 1 further including a user contactable element and said electrostatic discharge contact element is located in said user element.

11. The system defined in claim 10 wherein said user contactable element includes a computer mouse pad.

12. The system defined in claim 1 wherein said resistor element has a value of approximately sixty megohms.

13. The system defined in claim 1 wherein said ground circuit includes signal leads.

14. The system defined in claim 1 further including a conductor electrically connecting said contact element to said ground circuit, with said resistor element being located within one foot of said contact element and further including second resistor element in said conductor and located spaced from said resistor element and adjacent to said ground circuit.

15. The system defined in claim 1 further including an electrical plug and a second resistor element, with said second resistor element being located at least partially in said electrical plug.

16. The system defined in claim 15 wherein said electrical plug includes a ground prong.

17. The system defined in claim 15 further including a test circuit.

18. The system defined in claim 15 and wherein said resistor element is physically located closely adjacent to said contact element.

19. The system defined in claim 15 wherein said electrical plug includes a prong positioned as a hot prong, said prong being non-conductive from said plug.

20. The system defined in claim 19 wherein said electrical plug further includes a neutral prong, said neutral prong being non-conductive from said plug.

21. The system defined in claim 15 wherein said electrical plug includes female receptacles.

22. The system defined in claim 15 wherein said electrical plug includes an internal resistor having a value of at least one megohm.

23. The system defined in claim 15 wherein said plug includes a plurality of grounding connectors.

24. The system defined in claim 15 wherein said plug includes a plurality of internal resistor elements.

25. The system defined in claim 1 further including a plug adapter and a second resistor element, with said second resistor element being at least partially located in said plug adapter.

26. The system defined in claim 25 further including an output lead from said plug adapter.

27. The system defined in claim 1 further including

a Litz wire electrically connecting said electrostatic discharge contact element to said ground circuit.

28. The system defined in claim 27 further including a second resistor in series between said Litz wire and said ground circuit.

29. The system defined in claim 1 further including a second resistor element, with said resistor element being located closer to said contact element than said second resistor element and said second resistor element being located closer to said ground circuit than said resistor element.

30. The system defined in claim 1 wherein said inductor element is physically spaced apart from the resistor element in said discharge circuit.

31. The system defined in claim 1 further including additional equipment and wherein said discharge path is adapted to be electrically connected to said additional equipment.

32. The system defined in claim 1 further including a second electrostatic discharge contact element connected to said first resistor element.

33. The system defined in claim 32 wherein the electrostatic discharge contact element and the second electrostatic discharge contact element each includes a resistor element.

34. The system defined in claim 1 wherein said inductor element has an inductance which is greater than the distributed inductance of said ground system at the connection location between said inductor element and said ground system.

35. The system defined in claim 34 further including a second resistor element in series with said inductor element.

36. The system defined in claim 1 further including an electrical plug and wherein said inductor element is at least partially located in said electrical plug.

43. The system defined in claim 32 wherein said headset pad has a resistance of at least 0.025 megohms.

37. A system for protecting a person or equipment from surprise, damaging or uncomfortable electrostatic discharge (ESD) comprising:

a headphone device;

an electrostatic discharge contact element which is located in said headphone device;

a discharge circuit electrically connected to said contact element, said discharge circuit including a first resistor element in series with said contact element and an inductor element in series with the first resistor element; and

a ground circuit electrically associated with said discharge circuit.

38. The system defined in claim 37 wherein said headphone device includes two electrical conductors.

39. The system defined in claim 38 further including a resistor element connected to each conductor.

40. The system defined in claim 37 further including a jack on said headphone device to which said control circuit is releasably connected.

41. The system defined in claim 37 wherein said headset includes an ear pad and said first resistor element is part of said ear pad.

42. The system defined in claim 37 wherein said headphone device includes a headset pad.

44. The system defined in claim 37 wherein said discharge circuit is connected to an ear pad on said headphone device.

45. A system for protecting a person or equipment from surprise, damaging or uncomfortable electrostatic discharge (ESD) comprising:

a ground system having stray inductance and resistance;

an electrostatic discharge contact element; and

an inductor electrically interposed in series between said contact element and said ground system and which is connected to said ground system at a connection location, said inductor element having an inductance which is greater than the stray inductance of said ground system at a connection location between said inductor element and said ground system.