Electrostatic discharge protection device

• US 5,490,033 A
• Filed: 04/28/1994
• Issued: 02/06/1996
• Est. Priority Date: 04/28/1994
• Status: Expired due to Fees

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Cronin, David V.
• Primary Examiner(s): Gaffin, Jeffrey A.
• Application Number:
  US08/234,917
• Time in Patent Office: 649 Days
• Field of Search: 361/212, 361/220, 439/181, 439/188, 439/189, 439/507, 439/510-515
• US Class Current: 361/212
• CPC Class Codes: H01R 13/6485 Electrostatic discharge protection in general H05F1/00, for electric apparatus H05K9/0067
• CPC Class Codes: H01R 13/703 operated by engagement or disengagement of coupling parts, e.g. dual-continuity coupling partH01R13/71 takes precedence
• CPC Class Codes: H01R 2103/00 Two poles
• CPC Class Codes: H01R 24/46 comprising switches
• CPC Class Codes: H01R 31/08 Short-circuiting members for bridging contacts in a counterpart

Abstract

An electrostatic discharge protection device that fits within a connector for high frequency cables having a tubular ground conductor surrounding one or more core conductors. The electrostatic discharge protection device creates a shunt across the one or more core conductors and the ground conductor thus electrically grounding any electrostatic discharge on the one or more core conductors. Upon joining of a complimentary receptor to the connector, the electrostatic discharge protection device automatically withdraws the shunt reestablishing electrical isolation among the one or more core conductors and the ground conductor.

Claims

1. An electrostatic discharge protection device for use with a connector having first and second complimentary members which are adapted to be joined electrically connecting corresponding parts of multiple high frequency cables;

each high frequency cable having a ground conductor formed in a tubular arrangement to encompass one or more core conductors where said ground conductor is adapted to be electrically grounded and is spaced apart from said one or more core conductors by a dielectric material for providing electrical insulation between the one or more core conductors and the ground conductor;

the first complimentary member having a ground shell which is electrically connected to the ground conductor and having one or more core connectors, where each of the one or more core connectors is electrically connected to a corresponding one of the one or more core conductors of the first complimentary member;

the second complimentary member having a ground shell which is electrically connected to the ground conductor and having one or more core connectors, where each of the one or more core connectors is electrically connected to a corresponding one of the one or more core conductors of the second complimentary member, said electrostatic discharge protection device comprising grounding means disposed within the ground shell of the first complimentary member having an operative position for establishing a shunt between the ground shell and each of the one or more core connectors which places the ground shell of the first complimentary member and the one or more core connectors of the first complimentary member at a substantially equivalent electrical potential when the first complimentary member is detached from the second complimentary member, and said grounding means having an inoperative position for interrupting the shunt to allow the ground shell and the one or more core conductors of the first complimentary member to become substantially electrically isolated when the first complimentary member is joined with the second complimentary member.

2. The electrostatic discharge protection device according to claim 1 wherein said first complimentary member is a male connector and said second complimentary member is a female receptor.

3. The electrostatic discharge protection device according to claim 1 wherein said first complimentary member is a female connector and said second complimentary member is a male receptor.

4. The electrostatic discharge protection device according to claim 1 wherein said grounding member is reusable in that the first complimentary member and the second complimentary member can be joined and disconnected multiple times without substantial detriment to the grounding member.

5. The electrostatic discharge protection device according to claim 1 wherein the grounding member is configured for automatic movement between the operative position and the inoperative position, and vice versa.

6. An electrostatic discharge protection device for use with a connector having first and second complimentary members which are adapted to be joined electrically connecting corresponding parts of multiple high frequency cables;

each high frequency cable having a ground conductor formed in a tubular arrangement to encompass one or more core conductors where said ground conductor is adapted to be electrically grounded and is spaced apart from said core conductors by a dielectric material for providing electrical insulation between the core conductors and the ground conductor;

the first complimentary member having a ground shell which is electrically connected to the ground conductor and having one or more core connectors, each core connector electrically connected to one core conductor;

the second complimentary member having a ground shell which is electrically connected to the ground conductor and having one or more core connectors, each core connector electrically connected to one core conductor, said electrostatic discharge protection device comprising

grounding means for providing electrical contact with the ground shell of the first complimentary member; and

contact member disposed within the ground shell in electrical communication with said grounding means and having an inherent resilient bias to urge the contact member into an operative position creating an electrical path between said one or more core connectors of the first complimentary member and the ground shell of the first complimentary member such that the one or more core connectors are held electrically ground, said second complimentary member having a structure that overcomes the inherent resilient bias upon joining the first and the second complimentary members of the connector such that the electrical path between the ground shell and the one or more core connectors is interrupted.

7. The electrostatic discharge protection device according to claim 6 further comprising a bridge member electrically conductive between said grounding means and said contact member, said bridge member extending from said grounding means to the contact member traversing the dielectric material.

8. The electrostatic discharge protection device according to claim 7 wherein said connector has a central axis and said contact member and said grounding means are oriented substantially parallel to said central axis while said bridge member is oriented transverse to said central axis.

9. The electrostatic discharge protection device according to claim 8 wherein said contact member and said grounding means extend from an interior portion of the first complimentary member to an exterior portion of the first complimentary member;

the bridge member couples the grounding means and the contact member in the exterior portion.

10. The electrostatic discharge protection device according to claim 7 wherein said electrostatic discharge protection device comprises a plurality of bridge members where each of the bridge members are connected to a contact member, and each said bridge means extends from a singular grounding member.

11. The electrostatic discharge protection device according to claim 10 wherein said electrostatic discharge protection device further comprises one or more barbs extending radially outward from said grounding means to secure the electrostatic discharge protection device within the ground shell of the first complimentary member.

12. The electrostatic discharge protection device according to claim 11 wherein said grounding means further comprises barbs projecting radially from said grounding means for mechanically engaging an interior lateral surface of said ground conductor of the first complimentary member to secure the electrostatic discharge device.

13. The electrostatic discharge protection device according to claim 7 wherein said electrostatic discharge protection device is substantially planar and said bridge member is curved laterally outward away from a plane of the electrostatic discharge protection device.

14. The electrostatic discharge protection device according to claim 6 wherein said contact mean is formed having a curve beginning tangent to a lateral surface of the dielectric material and proceeding along a circular radius to inhibit kinking.

15. The electrostatic discharge protection device according to claim 6 wherein said grounding means is rounded to facilitate withdrawal of the first complimentary member from the second complimentary member.

16. The electrostatic discharge protection device according to claim 6 wherein said grounding means comprises a resilient planar tab.

17. The electrostatic discharge protection device according to claim 6 contact member comprises a resilient planar tab.

18. The electrostatic discharge protection device according to claim 6 wherein said contact member has a distal end which electrically communicates with said core connector and said distal end is formed with a "V" shaped cut.

19. The electrostatic discharge protection device according to claim 6 wherein said electrostatic discharge protection device comprises a plurality of contact members, each of the contact members adapted to contact a core connector and each of the contact members extend from a singular grounding means.

20. An electrostatic discharge protection device for use with a cable connector having first and second complimentary members which, when joined, combine multiple high frequency cables;

each high frequency cable having a ground conductor formed in a tubular arrangement to encompass at least one core conductor where said ground conductor is electrically neutral and is held apart from said at least one core conductor by a dielectric material such that electrical communication is inhibited between the at least one core conductor and the ground conductor, said electrostatic discharge protection device comprising

grounding means having an annular structure about a central axis forming an aperture and in communication with said ground conductor, said grounding means for providing electrical contact with the ground conductor of the first complimentary member;

a bridge member in electrical communication with said grounding means and extending from said grounding means into said aperture such that the bridge member traverses the dielectric material and is formed with a bridge bulge to bias said bridge member axially outward parallel to the central axis; and

contact member in electrical communication with said bridge member having a contact angle to urge the contact member axially inward with respect to the central axis into electrical contact engagement with said at least one core conductor for providing a shunt between said at least one core conductor and said ground conductor of the first complimentary member, said contact angle said bridge bulge being displaced upon operative combination of the first and the second complimentary members of the cable connector such that the shunt is opened and the ground conductor and the at least one core conductor become electrically isolated.

21. An electrostatic discharge protection device for selectively connecting a ground conductor in a connector-receptor assembly to one or more core conductors in the connector-receptor assembly where the connector-receptor assembly is adapted to be connected and disconnected to establish or break an electrical path, respectively, the electrostatic discharge protection device comprising

a ground member fixedly disposed within the connector-receptor assembly in electrical contact with the ground conductor;

and

a contact member extending from the ground member having an operative position and an inoperative position, the operative position being attained when connector-receptor assembly is disconnected allowing an inherent resilient bias of the contact member to urge the contact member into electrical contact with the one or more core conductors to establish electrical communication between the one or more core conductors and the ground conductor thus inhibiting electrostatic charge accumulation on the one or more core conductors, the inoperative position being attained upon operative connection of the connector-receptor assembly such that the inherent resilient bias of the contact member is automatically overcome removing the electrical contact with the one or more core conductors thus creating electrical isolation between the one or more core conductors and the ground conductor.