Shielded electrical contact spring probe assembly

US5175493A · kind A · utility

Assignee

• Interconnect Devices, Inc. · US

Inventor

• Ulf R. Langgard · Overland Park, US

Key dates

• Filing date: Oct 11, 1991
• Grant date: Dec 29, 1992
• Expiry date: Oct 11, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R1/06772
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A shielded electrical contact spring probe assembly for testing electrical printed circuit boards includes an outer barrel having an open end and a remote end, an inner core of dielectric material coaxially mounted within the barrel, and an electrical contact spring probe reciprocally seated within an axial bore in the core. A shield surrounds the core between the barrel inner wall and the core and extends the full length of the barrel. A shielding plunger is located in a cylindrical space between the barrel and the shield. The probe assembly remote end is for connection of an electrical transmission line, or in an alternative embodiment, inserting a second electrical contact spring probe within the core. The configuration and material of the core and the shield enable the entire probe assembly to maintain a selected impedance. The electrical contact spring probe seated within the core axial bore includes a separate barrel having a spring seating end and an open end, a compression spring seated in the closed end of the barrel, and a plunger inserted into the barrel. The plunger includes a tail section, connected to a shaft or probe section that protrudes from the barrel and include…