US 6,655,983 B1 · Electrical test probe provided with a signal transmitting wire having an enlarged portion for preventing the wire from coming out of the probe

Abstract

In order to make a conductive contact that is appropriate for fine pitching, without using a lead wire whose diameter is needlessly thin, a compressed coil spring 5 and the shells 6a and 7a of needle-like elements 6 and 7 that are connected to the two ends of the coil are accepted into a through hole 3a in an intermediate-layer member 3 that is laminated with three layers in an axial direction. A holding hole 8a is formed in a wiring plate 8 that is laminated on the top face of an upper-layer member 4, and an approximately circular flat part 9a that is formed at the end of a signal-transmitting lead wire 9 is accepted in the holding hole 8a of the wiring plate 8, and extraction of the flat part 9a from the holding hole 8a is prevented by making the lead-wire insertion hole 8b narrower in diameter than the holding hole 8a. Extraction of the flat part 9a can be prevented by simple processing such that a flat-formed part is formed at one end of the signal-transmitting lead wire 9 that connects with an outside circuit 10. In addition, the signal-transmitting lead wire 9 does not have to be needlessly thin (i.e., it can be as thick as is necessary to transmit the signal), because a pipe-shaped connector does not need to be used, and that prevents an increase in the lead-wire resistance and makes possible fine pitching.

Claims18

Dependent claims

An electrical test probe comprising:

a plurality of conductive needle-like elements which are arranged along a plurality of rows that are perpendicular to the needle-like elements;
a wiring plate supporting the needle-like elements that protrude in an axial direction;
and
signal-transmitting wires each of which is provided to one of said plural needle-like elements for transmitting to an outside circuit an electrical signal that is retrieved by bringing a protruded end of the needle-like element into contact with a device to be tested;
wherein
(a) each of said signal-transmitting wires is a single wire with a circular cross section;
(b) each of said signal-transmitting wires has an end at an electrical-signal-input side thereof, wherein said end is circular in cross section and by said end the electrical-signal-input side is brought into contact with the associated conductive needle-like element;
(c) each of said signal-transmitting wires has a flat portion which protrudes in a diametrical direction of said signal-transmitting wire and is formed on the wire at a portion that is spaced from said end of the electrical-signal-input side;
(d) said flat portion is directly accepted in said wiring plate;
and
(e) an end of said wiring plate is open at a diameter large enough to allow the signal-transmitting wire to pass through but small enough to prevent extraction of the flat portion thereof.

8 more elements

Dependencies are inferred from the claim text.

Electrical test probe provided with a signal transmitting wire having an enlarged portion for preventing the wire from coming out of the probe

Life of this patent

Electrical test probe provided with a signal transmitting wire having an enlarged portion for preventing the wire from coming out of the probe

Life of this patent

Abstract

Claims18