JP2586743B2 - Contact probe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact probe, and more particularly to a contact probe used for electrical inspection.

[0002]

2. Description of the Related Art As a conventional technique, for example, USP
There is a contact probe described in AT No. 3,435,168.

A conventional contact probe will be described in detail with reference to the drawings. FIG. 2 shows a conventional contact plug.
It is sectional drawing which shows an example of a lobe . Contact probe shown in FIG. 2 has a hollow cylindrical diaphragm, a housing 21 having a recess in a part, a small stepped than the intermediate portion outer ends become located with one end sharp needle into the housing 21 Conical probe needle 22 , spring 23 in contact with the other end of probe needle 22 , housing 21 and spring
23 and a ball 24 sandwiched between them.
Here, the probe needle 22 comes into contact with the contact surface,
23 , the ball 24 was pressed against the housing 21 , and an electric signal was taken out.

[0004]

In the above-mentioned conventional contact probe, in order to obtain a good connection in which the oxide film on the contact surface is broken and an unnecessary scratch is not made, the probe needle is applied with a predetermined load. The load must be pressed against the contact surface, and this load is usually controlled so that the amount of pushing of the probe needle is 2/3 of the total amount of pushing. Therefore,
When the contact height with the probe needle, such as the inspection pad, the IC lead, and the solder surface, is different, there is a disadvantage that the moving amount of the contact probe must be changed for each.

[0005]

Means for Solving the Problems To solve the above problems,
For example, the contact probe of the present invention has a cylindrical housing.
And a blower that is swingably guided at one end in the housing.
And the other end is measured outside the housing.
A probe needle having a tapered shape arranged so as to be able to contact an object
A second side of the housing from which the probe needle protrudes.
1 and the block,
A spring that applies elastic force to the edge in a direction away from the end.
And the side of the block opposite to the side on which the spring is disposed
And a cylindrical iron core placed through an insulating spacer
A pipe and the iron disposed on an outer peripheral portion of the housing;
A predetermined thrust is applied to the core pipe to bring the core pipe forward.
An electromagnetic coil that swings in the housing,
Connected to the block, the insulating spacer and the iron core
Through the hollow portion of the pipe, the first of the housing
From the second end opposite to the end of
And a lead wire.

[0006]

Next, the present invention will be described in detail with reference to the drawings.

FIGS. 1A and 1B are sectional views showing an embodiment of the present invention. The contact probe shown in FIGS. 1A and 1B includes (A) a pipe-shaped housing 2 having an aperture at one end, (B) an electromagnetic coil 1 mounted on the outer periphery of the housing 2, and (C) a housing 2. A needle 3 having one end having a stepped portion that is slidably guided inside the side of the housing 2 having the throttle, and the other end having a sharp projection coming out of the housing 2; (E) a hollow insulating spacer 5 inserted into the housing 2 so as to be in contact with the stepped portion of the needle 3, (F) located in the housing 2 and fixed to the insulating spacer 5. (G) a lead wire 7 which is connected to the stepped portion of the needle 3, and is drawn out from the other end of the housing 2 through the insulating spacer 5 and the hollow portion of the iron core pipe 6. Is done.

FIG. 1A shows a state before the operation. The force acting on the needle 3 is only the reaction force by the spring 4 and is not in contact with the contact surface 8 because the electromagnetic coil 1 is not energized. FIG. 1B shows a state after the operation, and the electromagnetic coil 1
When a constant thrust F acts on the iron core pipe 6, the spring 4 is contracted and the needle 3 is pushed down. The contact pressure at this time is such that the spring constant k of the spring 4 is sufficiently smaller than the thrust F generated by the electromagnetic coil 1, so that the reaction force f of the spring 4 can be neglected and becomes substantially the same as the thrust F. Further, an electric signal is directly extracted from a lead wire 7 connected to the needle 3 insulated by the iron core pipe 6 and the insulating spacer 5.

[0009]

According to the contact probe of the present invention, since the operation of the needle is directly driven by the electromagnetic coil, the position becomes constant at any position of the contact pressure stroke of the needle, so that a constant thrust is applied to the contact surfaces having different heights. Since the contact can be made, there is an effect that the moving amount of the contact probe does not need to be changed according to the height of the contact surface.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of the related art.

[Explanation of symbols]

 Reference Signs List 1 electromagnetic coil 2 housing 3 needle 4 spring 5 insulating spacer 6 iron core pipe 7 lead wire

Claims (1)

(57) [Claims] 1. A housing having a cylindrical housing and a block which is swingably guided in the housing at one end.
The other end contacts the DUT outside the housing
A probe needle operably disposed and having a tapered shape, and a first side of the housing on the side where the probe needle protrudes.
Placed between the end and the block,
On the other hand, a spring that applies elastic force in a direction away from the end, and a side of the block opposite to the side on which the spring is disposed,
Cylindrical iron core pie placed via insulating spacer
And the outer periphery of the housing,
A predetermined thrust is applied to the
An electromagnetic coil that oscillates in the housing, one end of which is connected to the block;
Through the hollow portion of the iron core pipe and the housing
From the second end opposite to the first end
A contact probe, comprising: a lead wire to be drawn out .