JP2805551B2 - Functional inspection equipment for mounted printed circuit boards - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a functional inspection apparatus for a mounted printed circuit board in which components are mounted on a printed circuit board, and more particularly to providing a test probe with a contact probe in contact with a lead on a mounting surface of the mounted printed circuit board. The present invention relates to a function test device configured as described above.

[0002]

2. Description of the Related Art A functional test is performed on a printed circuit board after mounting to check whether the printed circuit board functions as specified. This is also called a fan cushion test, in which a contact probe is brought into contact with the lead of the connector on the mounting printed circuit board to give an input signal,
It is to check whether or not the output signal of the connector is normal. As shown in FIG. 3, an example of a conventionally used function inspection apparatus is to first set a mounting printed circuit board 21 on a table 23 having positioning pins 22 and then place an upper lid 24 disposed above. The contact probe 26 held by the socket fixing stand 25 of the upper lid 24 is lowered by driving means (not shown) toward the printed circuit board 21, and the lead pins 28 of the connector 27, which is a mounted component of the printed circuit board 21. Contact. In this way, the input signal is supplied to the connector 27 via the bundled wire 25a, and the output of the connector 27 is checked to perform a function test of the mounted printed circuit board.

[0003]

According to the above-mentioned prior art, as described above, the contact probe 26 inserted into the socket fixing stand 25 of the upper lid 24 at the upper end of each contact probe is used.
The lead pin 2 of the connector 27 is
When the lead pin 28 is not at a predetermined position due to a shift or a twist of the mounting position of the connector 27 on the printed circuit board, a contact failure of the contact probe occurs, and the reliability of the function test is impaired. . In addition, there is also a problem that unexpected stress is applied to the contact probe due to the above-described poor contact, and the contact probe is bent.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and when a contact probe of a function inspection device is brought into contact with a lead pin of a mounted component such as a connector of a mounted printed circuit board, the contact between the two is considered. It is an object of the present invention to provide a function inspection device for a mounted printed circuit board that prevents defects and does not deform a contact probe during a function inspection. Further, another object of the present invention is to find out in a process of a functional inspection, when a mounted component such as a connector is mounted on a printed circuit board in a state of being turned right and left or back and forth due to a mistake in a mounting process. It is an object of the present invention to provide a function inspection device for a mounted printed circuit board that can perform the function inspection.

[0005]

In order to achieve the above object, a function inspection apparatus for a mounted printed circuit board according to the present invention connects a contact probe to a lead pin of the mounted printed circuit board.
Touch to give test input signal and output signal is normal
In the function inspection device for checking whether the contact
Moving the probe toward and away from the printed circuit board
Through-hole in the socket fixing base provided on the free movable board
And the lead pin is fitted into the opening of the through hole.
Contact probe with the lead pin.
It is characterized in that it has configured to.

[0006]

[0007]

According to the present invention , a function inspection apparatus for a mounted printed circuit board according to the present invention is provided.
Before the tip of the contact probe contacts the re <br/> Dopin of mounting a printed circuit board, opening of the through hole of the socket fixing base
It said lead pin is fitted in the mouth, to correct the relative positional deviation between said contact probe and the lead pin.

[0008]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a partial longitudinal sectional view showing a part of an embodiment of the present invention.

In this embodiment, the mounting printed board 1 is held at a predetermined position on a table 3 by positioning pins 2, and an upper lid 4, which is a movable plate, is disposed above the table 3. A guide block 10 is screwed to the lower surface by screws 9. A first concave portion 11 is formed on the upper surface of the guide block 10 in the drawing, and a socket fixing base 5 is integrally provided as a bottom portion thereof. Socket fixing stand 5
Each of the plurality of through holes 12 has a contact probe 6
Is inserted. The connector 7, which is a mounting component of the mounting printed board 1, includes a plurality of lead pins 8 protruding from the mounting surface of the mounting printed board 1.

In this embodiment, the socket fixing base 5 is provided separately by fixing the socket fixing base 5 to the guide block 10. However, the present invention is not limited to this, and the socket fixing base is provided integrally with the guide block. You may.

A contact probe 6 is fitted into each through-hole 12 provided in the socket fixing base 5 which is also a bottom of the first concave portion 11, and a lower end (needle) thereof is slidable. Is inserted into. A second concave portion 13 is provided on the lower end surface of the guide block 10, and the second concave portion 13 is provided.
The peripheral wall of the concave portion 13 has a shape along the outer edge of the connector 7, and a part of the peripheral wall is provided with a groove 15 for accommodating a projection 14 provided at an edge of the connector 7 (shown in FIG. 2). ).

When starting the function test of the mounted printed circuit board 1, the upper lid 4 located above is lowered toward the mounted printed circuit board 1 by driving means (not shown), and the socket is fixed to the upper lid 4. The contact probe 6 held via the base 5 descends together with the guide block 10 toward the lead pin 8 of the connector 7. When the lower end of the guide block 10 approaches the surface of the mounting printed circuit board 1, the connector 7 is accommodated in the second recess 13 of the guide block 10 and the projection 1 provided on the side surface of the connector 7.
4 is inserted into a groove 15 provided on the peripheral wall of the second recess 13 (shown in FIG. 2). At this time, if the mounting position of the connector 7 with respect to the mounting printed board 1 is reversed in the left-right or front-rear direction due to a mistake in the mounting process of the mounting printed board 1, that is, in the case of reverse mounting, the connector 7 is attached to the guide block 10. It cannot be accommodated in the second recess 13, so that the downward movement of the upper lid 4 is prevented. This makes it possible to easily find a mounting error of the connector 7.

If there is no mounting error described above, the connector 7 is smoothly accommodated in the second concave portion 13 of the guide block 10, and the upper lid 4 is continuously lowered to fix the socket.
Lead pin 8 is fitted into the lower end opening of the through hole 12 of the base 5. When the upper lid 4 further descends in this state, the tips of the contact probes 6 abut against the upper ends of the lead pins 8, respectively, and subsequently slightly reduce the entire length thereof against a built-in spring (not shown).

That is, each contact probe 6 is pressed against each lead pin 8 by the elasticity of the built-in spring, and gives an input signal to the connector 7 via the bundle 5a. The relative displacement between each contact probe 6 and the lead pin 8 may be caused by the through hole 1 in the socket fixing base 5 before each contact probe 6 comes into contact with the lead pin 8.
To be corrected by lead pins 8 to the opening of the lower end of 2 is fitted, contact failure of the contact probe 6 is not generated.

Further, since the lateral movement of each contact probe 6 is limited by the guide block 10, there is no possibility that the contact probe 6 will bend significantly due to stress when the contact probe 6 comes into contact with the lead pin 8.

As described above, according to the present embodiment, even when the lead pins 8 are slightly misaligned, the contact probe 6 can be reliably brought into contact with each of the lead pins 8. The function test can be performed smoothly, and the test result is highly reliable.

[0018]

Since the present invention is configured as described above, it has the following effects.

Since the contact probe of the functional inspection device for the mounted printed circuit board can be reliably brought into contact with the lead pins of the mounted printed circuit board , the reliability of the inspection result is improved. Further , there is no possibility that the contact probe is deformed or damaged during the function test of the mounted printed circuit board. Further , there is an advantage that a mounting error of a mounted component can be found in a process of a function inspection of the mounted printed circuit board.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view taken along line AA ′ of FIG.

FIG. 3 is a partial longitudinal sectional view showing a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mounting printed circuit board 3 Placement stand 4 Top lid 5 Socket fixing stand 6 Contact probe 7 Connector 8 Lead pin 10 Guide block 11 1st recess 12 Through hole 13 2nd recess 14 Projection 15 groove

Claims (1)

(57) [Claims] 1. A contour is attached to a lead pin of a mounting printed circuit board.
Contact the test probe to give an input signal for testing and output.
In a functional inspection device for checking whether or not a force signal is normal, the contact probe is attached to the mounting printed circuit board.
Soke provided on a movable plate that can be approached and separated
Into the through-hole of the fixing stand, and
By fitting the lead pin, the contact probe is
A function inspection device for a mounted printed circuit board, wherein the device is configured to be in contact with a lead pin .