JPH09229964A - Probe for through hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deformation of a contact needle by inserting a clip terminal for elastically deforming the end of the needle and a through hole to bring it into electric contact with the hole into the hole, and holding the needle with an erected holder. SOLUTION: A contact needle 4 is formed in a round bar-like state with the end 1 of a small diameter, the end 1 is inserted into the through hole 3 of a printed circuit board 2 and brought into electric contact. A holder 7 supports the needle 4 of the state inserted into the hole 3 so as not to fluctuate it, has a hole for inserting the needle 4 at the center, is formed in a cylindrical state, and has a guide plate 9 at the lower end. A clip terminal 8 elastically deforms the end 1 of the needle 4 and the hole 3 to bring it into electric contact which is formed in a shape called 'banana clip terminal', and integrally implanted to the lower surface of the plate 9 of the holder 7. When the terminal 8 is inserted into the hole 3, the holder 7 is erected in the state that the plate 9 is brought into stable contact with the board 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board having no test terminals, which is directly inserted into a through hole formed in the printed wiring board when performing an operation test for debugging or the like. The present invention relates to a through-hole probe, which is capable of improving the reliability of contact while preventing the contact needle from being deformed or broken.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional through-hole probe of this type has a round bar-like end portion 1 having a small diameter, and the thin diameter end portion 1 is a printed wiring board 2 to be tested. It has a contact needle 4 which is inserted into the through hole 3 and makes electrical contact. In FIG. 2, reference numeral 5 indicates a land formed on one surface of the printed wiring board 2, and reference numeral 6 indicates a cover body made of plastic or the like for covering the contact needle 4 except the tip portion 1. ing. Then, the operator holds the cover body 6 with fingers and inserts the tip portion 1 of the contact needle 4 into a required through hole 3 of the printed wiring board 2 to be tested from above, and the through hole 3 and the tip portion 1 are inserted. With and in electrical contact,
A lead wire (not shown) connected to the upper end of the contact needle 4.
A signal for an operation test was flown from a performance board (not shown) via the, and timing waveforms during the operation of the printed wiring board 2 were observed by an oscilloscope (not shown).

[0003]

However, in such a conventional through-hole probe, the small-diameter tip portion 1 of the contact needle 4 formed in a round bar shape with a certain length is used as the printed wiring board to be tested. Since it was directly inserted into the through hole 3 of No. 2, the upper end of the contact needle 4 extending upward during the operation test wobbles, and the thin tip 1 inserted into the through hole 3 is bent and deformed. In severe cases, it could break. At this time, if the tip portion 1 is broken, the operation test of the printed wiring board 2 cannot be performed. In addition, when it is bent and deformed, the contact between the tip portion 1 and the through hole 3 becomes poor and noise occurs, or the reliability of contact decreases. Therefore, the accuracy of the operation test of the printed wiring board 2 is lowered, and the reliability is lowered.

In view of this, the present invention addresses such problems and prevents the contact needles inserted into the through holes formed in the printed wiring board from being deformed or broken and improving the reliability of contact. It is an object of the present invention to provide a through-hole probe capable of

[0005]

In order to achieve the above object, a through-hole probe according to the present invention has a round bar shape and a tip end portion formed to have a small diameter, and the tip end portion having the small diameter is a printed wiring board to be tested. A contact needle that is inserted into the through hole and that makes electrical contact, and a guide plate that has a hole for inserting the contact needle in the center and is formed in a tubular shape of a predetermined length and that extends laterally at the lower end. A holder portion formed of an insulating material, a tip of a contact needle extending downward from a guide plate of the holder portion and inserted into the through hole and inserted into the center hole of the holder portion, and the through hole. And a clip terminal portion that is elastically deformed to make electrical contact.

[0006]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a front explanatory view of a use state showing an embodiment of a through-hole probe according to the present invention. This through-hole probe is designed to test a printed wiring board without a test terminal by directly inserting a contact needle into the through hole formed in the printed wiring board when performing an operation test for debugging or the like. As shown in FIG. 1, the contact needle 4, the holder portion 7, and the clip terminal portion 8 are provided.

The contact needle 4 is used to connect a required through hole 3 of the printed wiring board 2 to be tested with a performance board (not shown) or the like, and has a round bar shape and a tip portion 1.
Is formed to have a small diameter, and the thin end portion 1 is inserted into the through hole 3 of the printed wiring board 2 so as to be in electrical contact therewith, and is formed of a conductive material such as metal. . Around the member of the round bar-shaped contact needle 4, a cover body 6 made of plastic or the like is covered except for the tip 1.

The holder portion 7 supports the contact needle 4 inserted in the through hole 3 of the printed wiring board 2 so as not to wobble, and has a hole for inserting the contact needle 4 at the center thereof. A guide plate 9 is formed in a tubular shape having a predetermined length and spreads laterally at the lower end, and is formed of an insulating material such as plastic. The guide plate 9 is
For example, the printed wiring board 2 is formed in a disk shape in a plan view.
The upper surface of the is contacted with a predetermined bottom area to maintain stability. Reference numeral 5 indicates a land formed around the through hole 3 on the upper surface of the printed wiring board 2, and reference numeral 10 indicates a grip portion laterally extending in a disc shape at the upper end portion of the holder portion 7. Is shown.

The clip terminal portion 8 ensures the contact between the tip portion 1 of the contact needle 4 and the through hole 3 of the printed wiring board 2, and extends downward from the guide plate 9 of the holder portion 7 and The tip portion 1 of the contact needle 4 inserted into the through hole 3 and inserted into the center hole of the holder portion 7 is elastically deformed to electrically contact the through hole 3. That is, a plurality of metal plates formed in a strip shape are arranged around a certain point around a certain point, and each metal plate is constricted toward the center at a position 11 slightly below the root portion.
The intermediate portion 12 is bulged outward and the lower end portion 13 is inclined inward at a predetermined angle, and is configured in a so-called banana clip terminal. Thereby, the lower end portion 13
Since it is inwardly inclined at a predetermined angle, it can be easily inserted into the through hole 3, and the tip portion 1 of the contact needle 4 is narrowed to the center side of the position 11 slightly below the root portion. The contact is ensured, and the outwardly bulged portion of the intermediate portion 12 is surely contacted with the inner surface of the through hole 3. The clip terminal portion 8 is integrally embedded in the lower surface of the guide plate 9 of the holder portion 7.

Next, the use of the through-hole probe thus constructed will be described. First, the holder part 7
The through-hole probe stored with the contact needle 4 inserted in the center hole of the holder is taken out, and the contact needle 4 is pulled out from the center hole of the holder portion 7. In this state, the operator
Holding the grip portion 10 of the holder portion 7 by hand, it is moved to above the printed wiring board 2 to be tested, and the clip terminal portion 8 is inserted from above the required through hole 3. At this time, since the lower end portion 13 of the clip terminal portion 8 is inclined inward, it can be inserted smoothly and easily. Then, the guide plate 9 at the lower end of the holder portion 7 abuts on the upper surface of the printed wiring board 2 over the entire bottom surface and stands upright in a stable state.

Next, the operator touches the contact needle 4 extracted as described above.
While holding by hand, the contact needle 4 is inserted from above into the central hole of the holder portion 7 standing upright on the printed wiring board 2 as described above.
Then, the tip portion 1 of the contact needle 4 advances from the top to the bottom in the center hole of the holder portion 7 and stops when the required amount is inserted. At this time, the tip portion 1 is inserted by pushing the necked portion of the clip terminal portion 8 slightly below the root portion of the clip terminal portion 8 so as to be expanded.
And the clip terminal portion 8 surely come into contact with each other. Further, by pushing and expanding the constricted portion, the clip terminal portion 8
The bulged portion of the intermediate portion 12 further bulges outward and is pressed against the inner surface of the through hole 3, so that the clip terminal portion 8 and the through hole 3 are surely brought into contact with each other. As a result, the tip portion 1 of the contact needle 4 and the through hole 3 are surely brought into contact with each other. At this time, since the contact needle 4 is held in the center hole of the holder portion 7 which is upright in a stable state as described above, it does not wobble like in the conventional case.

In this way, while the through hole 3 and the tip portion 1 are in electrical contact with each other, a lead wire (not shown) connected to the upper end portion of the contact needle 4 is provided, which is not shown. An operation test of the printed wiring board 2 to be tested is performed by sending a signal for an operation test from a performance board or the like, and observing the timing waveform and the like during operation of the printed wiring board 2 with an oscilloscope (not shown).

[0013]

Since the present invention is constructed as described above,
A round bar shaped tip is formed with a small diameter, and this thin diameter tip is inserted into a through hole of the printed wiring board under test to make electrical contact, and the center of the hole for inserting this contact needle. And a holder part formed of an insulating material having a guide plate which is formed in a tubular shape having a predetermined length and spreads in the lateral direction at the lower end part, and the through hole extending downward from the guide plate of the holder part. A clip terminal portion which is elastically deformed to electrically contact the tip portion of the contact needle inserted into the center hole of the holder portion and the through hole by inserting the clip terminal portion into a printed wiring. The contact needle can be held in a stable state by the holder portion that is inserted into the through hole of the substrate and stands upright, and the contact needle does not wobble. Therefore, the contact needle can be prevented from being deformed or broken as in the conventional case, and the reliability of contact can be improved.

[Brief description of drawings]

FIG. 1 is a front explanatory view of a use state showing an embodiment of a through-hole probe according to the present invention.

FIG. 2 is a front explanatory view showing a conventional through-hole probe in a used state.

[Explanation of symbols]

 1 ... Tip part 2 ... Printed wiring board 3 ... Through hole 4 ... Contact needle 5 ... Land 6 ... Cover body 7 ... Holder part 8 ... Clip terminal part 9 ... Guide plate

Claims (1)

[Claims] 1. A contact needle which is formed into a round bar shape and has a thin tip portion, and the thin tip portion is inserted into a through hole of a printed wiring board to be tested to make electrical contact, and the contact needle is inserted. A holder part formed of an insulating material having a guide plate that is formed in a tubular shape of a predetermined length and has a laterally widened lower end part, and a downward direction from the guide plate of the holder part. A distal end portion of a contact needle that extends and is inserted into the through hole and inserted into the central hole of the holder portion; and a clip terminal portion that elastically deforms the through hole to electrically contact the through hole. Through-hole probe.