KR100313772B1 - Test fixture for PCB - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PCB test apparatus, comprising a matrix structure for contacting contact means with a signal and a ground terminal of a PCB, without manual measurement by a measurer, and determining whether the signal is detected through a measuring instrument and a computer. It is an object of the present invention to provide a PCB test apparatus that can be expected to improve the productivity and accuracy of the good / bad judgment by making the automatic measurement of the PCB.

The purpose of the PCB test apparatus for applying a test signal to the signal terminal of the PCB to determine the good and bad of the PCB by the reflected signal,

At least one through-hole is formed in the upper fixing member so that at least one impedance cable drawn from the measuring instrument is inserted into and fixed to the upper fixing member, and the end of the impedance cable is further extended to be connected to the lower fixing member, thereby shielding the impedance cable. Ground contact means electrically connected to the lower fixing member, the conductor is electrically connected to the signal contact means provided to protrude to the lower portion of the lower fixing member, the lower contact of the lower fixing member in electrical contact with the lower fixing member The signal contact means is brought into contact with the signal terminal of the PCB during the PCB test, and the ground contact means is achieved by being configured to be in electrical contact with the ground terminal of the PCB.

Description

Test fixture for PCB {Test fixture for PCB}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PCB test apparatus, and more particularly, to a PCB test apparatus capable of performing a high speed and a large amount of tests by automating impedance measurement of a PCB.

In general, in order to determine whether the PCB of a high frequency material is good or bad, impedance measurement of the PCB having been manufactured is performed to determine whether a short circuit occurs.

As a method for judging the failure, the measurer has taken an individual method of manually measuring the probe position by using a probe attached to the meter.

Since this measurement method is dependent on the manual work of the measurer, it requires the skill of the measurer, and it is difficult to maintain uniformity of quality due to individual errors between the measurers.

In addition, the test time of the PCB takes a long time, thus reducing productivity. In particular, since the user directly touches the probe, the tester has a fatal effect on the measuring instrument, which is very vulnerable to static electricity, and the accuracy of the good judgment due to the error of the device cannot be determined.

Therefore, such a manual PCB test operation suffers from a problem of low productivity and difficult determination of a good or bad payment.

Therefore, in order to solve this problem in the related art, a matrix structure for contacting the pogo pins with a signal and a ground terminal of a PCB, without using a manual measurement by a measurer, is constructed, and the signals detected therefrom are measured. It is an object of the present invention to provide a PCB test apparatus that can be expected to improve the productivity and the accuracy of the good judgment by making a good judgment through the automatic measurement of the PCB.

1 is a schematic diagram of a PCB test apparatus of the present invention.

2 is a view showing a PCB test apparatus according to an embodiment of the present invention.

3 is a perspective view of the pin holder of FIG. 2.

4 illustrates a PCB test apparatus according to another embodiment of the present invention.

5 illustrates a PCB test apparatus according to another embodiment of the present invention.

6 is a perspective view of the contact cap of FIG. 5.

7 illustrates a PCB test apparatus according to another embodiment of the present invention.

8 is a block diagram of an apparatus for determining good and bad PCB from a test signal applied through an impedance cable.

<Explanation of symbols for the main parts of the drawings>

100: PCB 111: signal terminal

112: ground terminal 200: probe structure

210: lower fixing member 211: signal pogo pin

212: ground pogo pin 220: upper fixing member

230: Bolt 231,232: Nut

240: Impedance cable 250: Fastening terminal

331: Shield 332: Conductor

340: guide pin 341: soldering

350: pin holder 351,352: transfer part

353: locking protrusion 370: insulator

371: jamming groove 430: solder ball

450: pin insertion hole 451: locking jaw

530: contact cap 531: conductor insertion hole

532: contact surface 630: plating

700: matrix terminal 800: measuring instrument

900: Computer

In the PCB test apparatus of the present invention for achieving the above object, in the PCB test apparatus for applying a test signal to the signal terminal of the PCB to determine the good and bad of the PCB by the reflected signal,

At least one through-hole is formed in the upper fixing member so that at least one impedance cable drawn from the measuring instrument is inserted into and fixed to the upper fixing member, and the end of the impedance cable is further extended to be connected to the lower fixing member, thereby shielding the impedance cable. Ground contact means electrically connected to the lower fixing member, the conductor is electrically connected to the signal contact means provided to protrude to the lower portion of the lower fixing member, the lower contact of the lower fixing member in electrical contact with the lower fixing member The signal contact means is provided in contact with the signal terminal of the PCB during the PCB test, the ground contact means is characterized in that it is configured to be in electrical contact with the ground terminal of the PCB.

The present invention configured as described above will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a PCB test apparatus according to the present invention. First, a signal terminal 111 and a ground terminal 112 are each formed in a pair on the PCB 100, and a plurality of such PCB 100 are formed. The signal terminal 111 and the ground terminal 112 are transported to the lower part of the probe structure 200 and then to the upper part, and the signal pogo pin 211 and the ground contact are provided as signal contact means provided in the lower fixing member 210. Each of the means is in contact with the ground pogo pin 212.

Since the signal pogo pin 211 is connected to the conductor of the impedance cable 240 in a 1: 1 manner, the signal pogo pin 211 receives a test signal from the measuring instrument and applies a test signal to the signal terminal of the PCB 100.

Subsequently, the reflected wave of the test signal is applied from the signal pogo pin 211 to provide the conduit of the impedance cable 240.

In this case, the lower fixing member 210 should be made of a metallic material that is a conductor in order to improve static electricity protection and signal characteristics, for example, copper, aluminum, and the like.

Of course, the lower fixing member 210 should be electrically insulated from the signal pogo pin 211, and the ground pogo pin 212 should be in direct contact with the lower fixing member 210 to allow the PCB 100 to be grounded. .

On the other hand, the present invention is to use the impedance cable to improve the impedance characteristics during the test, the impedance cable is supported by the upper fixing member 220 for a stable connection to the lower fixing member 210.

That is, the upper fixing member 220 is located at a position spaced from the lower fixing member 210 by a predetermined distance, and the upper fixing member 220 is provided with a fastening terminal 250 for fixing the impedance cable 240. do.

Therefore, when the impedance cable 240 is connected to the lower fixing member 210 through the upper fixing member 220, the fastening terminal 250 is to stably fix the impedance cable 240.

At this time, the upper fixing member 220 is fixed in a state spaced a predetermined distance by using the lower fixing member 210, bolts 230 and nuts (231, 232).

On the other hand, when the fastening terminal 250 is configured as a cable jack, the impedance cable 240 is directly connected to the fastening terminal 250, and a separate impedance cable 240 ′ is connected from the fastening terminal 250. It may have a structure to connect to the lower fixing member 210 by using.

7 is a diagram showing the configuration of a device for determining the good and bad of the PCB from the test signal applied through the impedance cable, the impedance cable is connected to each of the matrix terminal 700, the signal reflected from the PCB 100 Received to provide a measuring instrument (800).

The instrument 800 detects and analyzes the signal thereof, and the result is provided to the computer 900 to determine whether the PCB is good or bad.

FIG. 2 is a detailed view showing an embodiment of a lower fixing member 210 of the probe structure 200 of FIG. 1, which includes a fixing member 300 having a plurality of holes for connecting the impedance cable 330; An insulator 370 having a central portion inserted therein and inserted into the hole; The conductor 332 of the impedance cable 330 is coupled to the center portion of the insulator 370, and the signal contact means 310 is coupled to the bottom of the insulator 370 so that the conductor 332 and the signal contact means ( A pin holder 350 that electrically connects 310; A guide pin 340 soldered to the shield 331 of the impedance cable 330 to connect it to ground; Signal contact means 310 is inserted into the lower portion of the pin holder 350 to be in contact with the signal terminal 111 of the PCB 100; It is provided on the lower portion of the fixing member 300, characterized in that consisting of the ground contact means 320 for contacting and grounding the ground terminal 112 of the PCB (100).

This will be described in detail.

At least one hole for connecting the plurality of impedance cables 330 is formed in the conductive member 300 having conductivity, and an insulator 370 for matching impedance is inserted in the inside thereof.

The insulator 370 has a cylindrical shape having a central portion thereof, and preferably uses Teflon having an insulating property.

The pin holder 350 is inserted into the through-center portion of the insulator 370 to electrically connect the conductor 332 and the signal pogo pin 310 of the impedance cable 330.

That is, as shown in FIG. 3, the conductor 332 is inserted into the upper portion. At this time, contact is made by the elastic force of the upper switching portion 351, and the lower switching portion 352 is formed at the lower portion of the signal pogo pin. 310 is inserted into it.

The upper and lower cutouts 351 and 352 have elasticity when the conductor 332 and the signal pogo pin 310 are inserted to increase contact force, and also facilitate exchange of the signal pogo pin 310 when worn. .

In addition, the upper switching portion 352 may not be formed when the conductor 332 is inserted with a pressure input, and thus may not be formed.

As another means for inserting the pin holder 350 into the insulator 370, a locking protrusion 353 is formed on both side walls of the pin holder 350, and the locking groove 371 formed inside the insulator 370. ) Is caught.

Therefore, the pin holder 350 is not easily separated from the insulator 370.

Meanwhile, a guide pin 340 is planted at both sides between the insulator 370 and the conductive fixing member 300, and soldered 341 to the shield 331 of the impedance cable 330 to fix it with ground. Electrically connected to the member 300 to perform the ground and the impedance cable 330 is to be separated from the fixing member 300, and further to prevent the left and right shake of the impedance cable 330.

That is, the guide pin 340 serves to support the impedance cable 330.

A hole for inserting the ground pogo pin 320 is formed in the lower portion of the fixing member 300, the pin holder 321 is inserted in the hole, it is easily separated from the hole before the ground pogo pin 320 is inserted However, when the ground pogo pin 320 is inserted thereto, the ground pogo pin 320 is tightly fixed to the inner surface of the hole by the elastic force by the switching portion.

In addition, similar to the pin holder 350 into which the signal pogo pin 310 is inserted, a locking protrusion is formed on the outer wall to be caught by the fixing member 330, thereby preventing departure.

The pin holder 321 may have a shape in which the upper transfer portion 351 is excluded from the pin holder 350 of FIG. 3, and since the fixing member 300 itself serves as a ground, the hole and the pin holder are provided. There should be no insulator between 321.

As a result, the ground pogo pin 320 is in contact with the ground terminal 112 of the PCB 100 to perform the grounding of the PCB 100.

The bottom surface of the fixing member 300 is provided with a non-conductive buffer member 360, which is to prevent damage to the PCB 100 when the PCB 100 is raised to contact with the fixing member 300.

4 is a detailed view illustrating another embodiment of the lower fixing member 210 of the probe structure 200 of FIG. 1, which includes a metallic cable fixing member 400 having a plurality of through holes formed therein; The impedance cable 410 in which the shield 411 is soldered 420 to the cable fixing member 400 and the solder ball 430 is formed in the conductor 412 is inserted into the through hole of the cable fixing member 400 to the bottom. ); A pin fixing member 440 of the non-conductor, in which a pin insertion hole 450 is formed and tightly fixed to the bottom of the cable fixing member 400; A signal pogo pin 460 inserted into the pin insertion hole 450 of the pin fixing member 440 to electrically connect the signal terminal of the PCB and the solder ball 430; Is inserted into the pin insertion hole of the pin fixing member 440 is composed of a ground pogo pin 470 for electrically connecting the ground terminal of the PCB and the cable fixing member 400.

On the other hand, the lower portion of the pin insertion hole of the pin fixing member 440 is formed with a locking step to prevent the separation of the signal pogo pin and ground pogo pin.

This will be described in detail.

At least one through hole for inserting and connecting a plurality of impedance cables 410 is formed in the cable fixing member 400 having conductivity, and the impedance cable 410 is inserted into the through hole.

The impedance cable 410 is inserted into the lower surface of the cable fixing member 400 through the through hole, and the upper side of the cable fixing member 400 and the shield 411 are soldered and grounded and structurally fixed.

The conductor 412 of the impedance cable 410 has a solder ball 430 formed at the end thereof to facilitate the contact of the signal pogo pin 460 thereafter.

Under the cable fixing member 400, a pin fixing member 440 for inserting and fixing the signal pogo pin 460 and the ground pogo pin 470 is provided, and should be formed of a non-conductor.

Accordingly, the pin fixing member 440 has a pin insertion hole 450 for inserting the signal pogo pin 460 and the ground pogo pin 470. The signal pogo pin 460 and the ground pogo pin 470 are formed. The locking jaw 451 is formed at the bottom of the pin insertion hole 450 to prevent the bottom side from being separated.

Thereafter, the cable fixing member 400 and the pin fixing member 440 are brought into close contact so that the signal pogo pin 460 is in contact with the solder ball 430, and the ground pogo pin 470 is connected to the cable fixing member 400. After contacting with the screw 480 is tightly coupled.

Therefore, the signal terminal of the PCB is electrically connected to the conductor 412, the ground terminal is electrically connected to the cable holding member 400 is grounded.

FIG. 5 is a detailed view showing another embodiment of the lower fixing member 210 of the probe structure 200 of FIG. 1, which includes a metallic cable fixing member 500 having a plurality of through holes formed therein; An impedance cable 510 inserted into the lower portion through the through hole of the cable fixing member 500 and the shield is in direct contact with the cable fixing member 500; A contact cap 530 fixed to the conductor 512 of the impedance cable 510 by soldering 540; A pin fixing member 560 of the non-conductor in which the pin insertion hole 570 is formed; A signal pogo pin 580 inserted into the pin insertion hole 570 of the pin fixing member 560 to electrically connect the signal terminal of the PCB to the contact cap 530; A ground pogo pin 590 inserted into the pin insertion hole of the pin fixing member 560 to electrically connect the ground terminal of the PCB to the cable fixing member 500; It is composed of an insulator 520 to insulate the cable fixing member 500 and the pin fixing member 560 and to fix the contact cap 530 to prevent the impedance cable 510 from being separated.

On the other hand, the lower portion of the pin insertion hole of the pin fixing member 590 is formed with a locking step to prevent the separation of the signal pogo pin and ground pogo pin.

In addition, the contact cap 530 is formed with a conductor insertion hole 531 into which the conductor 512 is inserted, and a contact surface 532 for contacting the signal pogo pin 580 is formed at the bottom thereof.

This will be described in detail.

At least one through hole for inserting and connecting a plurality of impedance cables 510 is formed in the conductive cable fixing member 500, and an impedance cable 510 having a jacket removed therein is inserted into the through hole.

The impedance cable 510 is inserted into the lower surface of the cable fixing member 500 through the through hole, and the conductor 512 is projected further downward.

On the other hand, a pin fixing member 560 for inserting and fixing the signal pogo pin 580 and the ground pogo pin 590 is provided below the cable fixing member 500.

Accordingly, the pin fixing member 560 has a pin insertion hole 570 for inserting the signal pogo pin 580 and the ground pogo pin 590, and the signal pogo pin 580 and the ground pogo pin 590. The locking jaw 571 is formed at the lower portion of the pin insertion hole 570 to prevent the bottom side from being separated.

On the other hand, between the cable fixing member 500 and the pin fixing member 560 is provided with an insulator 520 in consideration of the impedance characteristics, the cable fixing member 500 is tightly fixed by a screw 550, the insulator ( 520 has a through hole for inserting the conductor 512 of the impedance cable 510 and a through hole for contacting the cable fixing member 500 with the ground pogo pin 590.

In addition, the conductor 512 is covered with a contact cap 530 to solder between the conductor 512 and the contact cap 530, 540, the contact cap 530 as shown in FIG. A conductor insertion hole 531 into which the conductor 512 is to be inserted is formed, and a contact surface 532 for contacting the signal pogo pin 580 is formed at the bottom thereof.

Therefore, the contact pogo pin 580 is brought into contact with the wide contact surface 532, thereby improving contact reliability.

In addition, the contact surface 532 is caught by the locking step 521 formed in the through hole of the insulator 520 to prevent the separation of the impedance cable 510.

Thereafter, the cable fixing member 500 and the pin fixing member 560 are brought into close contact so that the signal pogo pin 460 is in contact with the contact cap 530, and the ground pogo pin 470 is penetrated by the insulator 520. The cable is fixed to the fixing member 500 through the hole to be in close contact.

Therefore, the signal terminal of the PCB is electrically connected to the conductor 512, and the ground terminal is electrically connected to the cable fixing member 500 is grounded.

FIG. 7 is a detailed view showing another embodiment of the lower fixing member 210 of the probe structure 200 of FIG. 1, which includes a metallic cable fixing member 600 having a plurality of through holes formed therein; An impedance cable 610 inserted into the through hole of the cable fixing member 600 to a lower portion thereof, and having a shield 611 soldered to the cable fixing member 600; A pin insertion member 640 of the non-conductor, in which a pin insertion hole 650 is formed and is tightly fixed below the cable fixing member 600; A signal pogo pin 660 inserted into the pin insertion hole 650 of the pin fixing member 640 to electrically connect the signal terminal of the PCB and the conductor 612 of the impedance cable 610; Is inserted into the pin insertion hole of the pin fixing member 640 is composed of a ground pogo pin 670 to electrically connect the ground terminal of the PCB and the cable fixing member 600.

Meanwhile, an end of the conductor 612 is formed with a metal plating layer.

In addition, the lower portion of the pin insertion hole of the pin fixing member 640 is formed with a locking step to prevent the separation of the signal pogo pin and ground pogo pin.

Explain this.

The structural aspect thereof has been described in detail in another exemplary embodiment of the present invention of FIG. 4, and thus, different parts will be described.

The conductor 612 of the impedance cable 610 is configured such that its end is in direct contact with the signal pogo pin 660. 630 is formed.

This plating layer is most preferably gold plated for impedance consideration or proper signal transmission, and other metal plating is also acceptable.

Therefore, the signal pogo pin 660 is contacted with better reliability than the case where it directly contacts the conductor 612.

As described in detail above, the PCB test apparatus of the present invention has the following effects by automatically determining whether or not the PCB is defective.

1. It does not rely on the manual work of the measurer and can eliminate the non-uniformity of quality due to individual error between the measurers.

2. Productivity can be increased by shortening PCB test time.

3. Eliminate static electricity to ensure the accuracy of good or bad judgments due to equipment failures.

Claims (13)

In the PCB test apparatus for applying a test signal to the signal terminal of the PCB to determine the good and bad of the PCB by the reflected signal, At least one through-hole is formed in the upper fixing member so that at least one impedance cable drawn from the measuring instrument is inserted into and fixed to the upper fixing member, and the end of the impedance cable is further extended to be connected to the lower fixing member, thereby shielding the impedance cable. Ground contact means electrically connected to the lower fixing member, the conductor is electrically connected to the signal contact means provided to protrude to the lower portion of the lower fixing member, the lower contact of the lower fixing member in electrical contact with the lower fixing member The PCB test apparatus, characterized in that the signal contact means in contact with the signal terminal of the PCB when the PCB test, the ground contact means is configured to be in electrical contact with the ground terminal of the PCB. The method of claim 1, wherein the lower fixing member A metallic fixing member having a plurality of holes formed therein for connecting the impedance cable; An insulator having a central portion inserted into the hole; A contact means holder inserted into a central portion of the insulator and coupled to a conductor of an impedance cable at an upper portion thereof, and at a lower portion thereof to a signal contact means coupled thereto to electrically connect the conductor and the signal contact means; A guide pin soldered to the shield of the impedance cable and connected to the ground; A signal contact means inserted into a lower portion of the contact means holder and in contact with a signal terminal of the PCB; PCB test apparatus, characterized in that provided in the lower portion of the fixing member, the ground contact means for contacting and grounding the ground terminal of the PCB. 3. The PCB test apparatus according to claim 2, wherein the contact means holder is provided with a locking protrusion formed on an outer wall thereof so as to be defective with a locking groove formed inside the insulator. The PCB test apparatus according to claim 2, wherein a lower portion of the lower fixing member further includes a buffer member to prevent damage when the PCB is in close contact. The method of claim 1, wherein the lower fixing member A metallic cable fixing member having a plurality of through holes formed therein; An impedance cable inserted into the through hole of the cable fixing member to a lower portion, the shield being soldered to the cable fixing member, and the solder ball formed on the conductor; A contact means fixing member of a non-conductor, wherein a contact means insertion hole is formed and is tightly fixed below the cable fixing member; Signal contact means inserted into the contact means insertion hole of the contact means fixing member to electrically connect the signal terminal of the PCB and the solder ball; And a ground contact means inserted into the contact means insertion hole of the contact means fixing member to electrically connect the ground terminal of the PCB and the cable fixing member. 6. The PCB test apparatus according to claim 5, wherein the lower portion of the contact means insertion hole of the contact means fixing member is provided with a locking step to prevent separation of the signal contact means and the ground contact means. The method of claim 1, wherein the lower fixing member A metallic cable fixing member having a plurality of through holes formed therein; An impedance cable inserted downward through the through hole of the cable fixing member and the shield directly contacting the cable fixing member; A contact cap fixed to the conductor of the impedance cable by soldering; Contact means fixing member of the non-conducting contact means insertion hole is formed; Signal contact means inserted into the contact means insertion hole of the contact means fixing member to electrically connect the signal terminal of the PCB and the contact cap; A ground contact means inserted into the contact means insertion hole of the contact means fixing member to electrically connect the ground terminal of the PCB to the cable fixing member; Insulation between the cable holding member and the pin holding member, PCB test apparatus, characterized in that consisting of an insulator for fixing the contact cap to prevent the separation of the impedance cable. 8. The PCB test apparatus according to claim 7, wherein the lower portion of the contact means insertion hole of the contact means fixing member is provided with a locking step to prevent separation of the signal contact means and the ground contact means. 8. The PCB test apparatus according to claim 7, wherein the contact cap has a conductor insertion hole into which the conductor is to be inserted, and a contact surface for contacting the signal contact means with a lower portion thereof. The method of claim 1, wherein the lower fixing member A metallic cable fixing member having a plurality of through holes formed therein; An impedance cable inserted into the through hole of the cable fixing member to a lower portion and the shield soldered to the cable fixing member; A pin insertion hole is formed and the contact means fixing member of the non-conductor is tightly fixed under the cable fixing member; Signal contact means inserted into the contact means insertion hole of the contact means fixing member to electrically connect the signal terminal of the PCB and the conductor of the impedance cable; And a ground contact means inserted into the contact means insertion hole of the contact means fixing member to electrically connect the ground terminal of the PCB and the cable fixing member. The PCB test apparatus of claim 10, wherein an end of the conductor is formed with a metal plating layer. The PCB test apparatus according to claim 10, wherein the lower part of the contact means insertion hole of the contact means fixing member is provided with a locking step to prevent separation of the signal contact means and the ground contact means. 13. The PCB test apparatus according to any one of claims 1 to 3, 5 to 10, and 12, wherein the contact means is a pogo pin.