JPH02129572A - board tester - Google Patents

Abstract

PURPOSE:To operate a switch automatically and to prevent malfunction by providing a means which switches the switch when a test pin for a power source slides slightly and a means which confirms the contacting between the test pin and a test round. CONSTITUTION:While respective test pins 7-10 provided on a board test base 6 contact respective test rounds 2-5 of a printed board 1 to be inspected, a power switch 15 is turned on and off automatically through the pin 14 for contacting confirmation and a contacting confirming device 14, so a component such as an LSI mounted on the board 1 is never broken. Further, defective extracting inspection is performed after it is confirmed that all the pins 7-10 contact the respective rounds 2-5 of the board 1 by using an impedance measuring instrument 16, so the malfunction of the board tester 12 due to contacting defects of the pins 7-10 is never caused.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to printed circuit boards or LSI chips before component mounting.
- This relates to a board tester for inspecting printed circuit boards to detect defects after mounting chip components, etc.

Conventional technology In recent years, with the advancement of high-density mounting technology for printed circuit boards, board testers have become important for inspecting printed circuit boards before components are mounted, or after mounting LSI and chip components. began to occupy An example of the conventional board tester mentioned above will be described below with reference to the drawings. FIG. 3 shows the configuration of a conventional board tester. In FIG. 3, reference numeral 1 denotes a printed circuit board to be inspected, which has a test round 2.3 for input/output signals, a test round 4 for ground, and a test round 5 for power supply. Reference numeral 6 denotes a board tester stand, which has test pins 7 and 8 for input/output signals, test pins 9 for ground, and test pins 10 for power supply. Each test pin 7,
8, 9, 10 are each test round 2.3, 4.5
Furthermore, the input/output signal test pins 7 and 8 are connected to the tester 12, and the ground test pins 9 and the power supply test pins 10 are connected to the power supply 13. 1
5 is a power switch, and 17 is a presser bar. The operation of the board tester configured as described above will be explained below. First, press the printed circuit board l against the board tester stand 6 with the presser bar 17, and press each test pin 7.8.
9. Touch the 10 to each test round 2, 3, 4°5 Next, turn on the power switch 15 and from the power supply 13,
A power supply voltage is applied between the ground test round 4 and the power supply test round 5 via the ground test pin 9 and the power supply test pin 10. When the power supply voltage is applied to the printed circuit board 1, the input/output signal test pins 7.8
Test round 2.3 and tester 1 for input and output signals through
The input/output signals are exchanged between the printed circuit board 1 and the printed circuit board 1.
Conduct inspection to remove defects. After the test, the printed circuit board 1 is removed from the board tester stand 6 after turning off the power switch 15.

Problems to be Solved by the Invention However, in the above configuration, 1) the printed circuit board to be tested is mounted on the board tester stand while the power supply voltage is applied between the ground test pin and the power supply test pin, or If you remove it from the board, there is a risk of destroying the LSI etc. mounted on the printed circuit board depending on the contact method, so please apply the power voltage after mounting the printed circuit board on the board tester stand, and before removing it from the board tester stand. In order to turn off the power, it is necessary to manually operate the power switch, which is cumbersome. 2) Since it cannot be confirmed that the test pin is in contact with the test round on the printed circuit board,
The board tester may malfunction unexpectedly due to poor contact. There was a problem with this. In view of the above problems, the present invention provides a board tester having a function of automatically operating a power switch and preventing malfunctions due to poor contact of test pins.

Means for Solving the Problems In order to solve the above problems, the board tester of the present invention has a means for switching the power switch when the power test pin slides a little, and a means for switching the power switch when the power test pin slides a little, and a means for all the test pins to contact each test round of the printed circuit board. The system shall be equipped with a means to confirm that the

Effect of the present invention With the above-described configuration, the power switch is automatically turned 0N10FF while each test pin is in contact with each test round of the printed circuit board to be inspected, so that parts such as LSIs mounted on the printed circuit board are destroyed. There is no need to worry, and there is no need to manually operate the power switch.Also, the test pins are not contacted because the test is performed after confirming that all test pins are in contact with each test round on the printed circuit board to identify defects. There is no need to worry about unexpected malfunctions of the board tester due to defects.

EXAMPLE Hereinafter, a board tester according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a board tester in a first embodiment of the present invention. In Figure 1, l is the printed circuit board to be inspected, test round 2.3 for input/output signals and test round 4 for ground.
and test round 5 for power supply. Reference numeral 6 denotes a board tester stand, which has test pins 7 and 8 for input/output signals, test pins 9 for ground, and test pins 10 for power supply. Each test pin 7.8.9.10 is configured to contact a respective test round 2, 3.4.5. Moreover, a contact confirmation pin 11 is provided inside the power supply test pin 10 . Test pins 7 and 8 for input/output signals are tester 12
The ground test pin 9 and the power supply test pin 10 are connected to the power supply 13.

Power supply test pin 10 and internal contact confirmation pin 1
1 are both connected to the contact i recognition device 14, and the power switch 15 is switched by the output thereof. Furthermore, test pin 7.8,
9 and 10 are all connected to the impedance measuring device 16. The operation of the board tester configured as 0 or more, where 17 is a presser bar, will be explained below. First, use the presser bar 17 to hold the printed circuit board 1 on the board tester stand 6.
When pressed, each test pin 7.8.9.10 contacts each test round 2.3, 4.5. Eventually, when each test pin 7.8, 9.10 slides a little, the power supply test pin 10 contacts the internal contact confirmation pin 11, which is electrically detected by the contact confirmation device 14 and the power switch is activated. Turn on 15. Power supply 13 at this moment
A power supply voltage is applied between the ground test round 4 and the power supply test round 5 of the printed circuit board 1 via the ground test pin 9 and the power supply test pin 10.

By doing this, the power supply voltage is applied to the printed circuit board 1 after each test pin 7.8.9.10 contacts each test round 2.3° 4.5, so that the LSI mounted on the printed circuit board 1 There is no need to worry about destroying the etc. The impedance measurement device 16 measures the impedance between the input/output signal test pin 7.8 and the ground test pin 9, or the input/output signal test pin 7.8, with the printed circuit board 1 pressed against the board tester stand 6. By measuring the impedance between the test pin 10 and the power supply test pin 10 and comparing it with the value measured in advance, each test pin 7.8.
9.10 and each test round 2. 3. 4. Check for poor contact between 5 and 5. If there is a poor contact, the impedance becomes infinite. After confirming that there is no poor contact between the test pins, next, input/output signals are exchanged between the input/output signal test round 2゜3 and the tester 12 via the input/output signal test pins 7.8. , the printed circuit board 1 is inspected for defects. In addition, even after the inspection is completed, before each test round 2゜3.4.5 of the printed circuit board 1 leaves each test pin 7.8.9.10, contact between the power supply test pin 10 and the contact confirmation pin 11 is confirmed. Since the power switch 15 is turned off when it comes off, there is no fear that the LSI etc. mounted on the printed circuit board 1 will be destroyed. As described above, according to this embodiment, the contact confirmation pin 11 inside the power supply test pin 10 is connected to both the contact confirmation pin 11 and the power supply test pin lO, and the output is used to connect the power switch 1.
5, each test round of the printed circuit board 1 to be inspected 2.3.4.
Since the power switch 15 automatically turns 0N10FF while each test pin 7.8, 9.10 is in contact with the test pin 5, there is no need to worry about destroying parts such as LSI mounted on the printed circuit board l, and you can manually turn the power on. There is no need to operate the switch 15. Also, by providing an impedance measuring device 1!116 connected to each test pin 7.8, 9.10, each test round 2.3.4. It is possible to check whether or not there is poor contact between 5 and 5.

A second embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows the configuration of a board tester according to a second embodiment of the present invention. In FIG. 2, reference numeral 1 denotes a printed circuit board to be inspected, which has test rounds 2 and 3 for input/output signals, test rounds 4 for ground, and test rounds 5 for power supply. Reference numeral 6 denotes a board tester stand, which has test pins 7 and 8 for input/output signals, test pins 9 for ground, and test pins 10 for power supply. Each test pin 7.8.9.10 is used for each test round 2.
3. 4. It is shaped like it touches 5. In addition, the power supply test pin IO has a contact pin 11 inside.The input/output test pins 7.8 are connected to the tester 12, and the ground test pin 9 and the power supply test pin 10 are connected to the test pin 12.
is connected to the power supply 13. Both the power supply test pin 10 and the contact confirmation pin 11 inside thereof are connected to a contact confirmation device 14, and the power switch 15 is switched by the output thereof. 17
6 is a presser bar, and the structure above is similar to that shown in FIG.

What is different from the configuration in FIG. 1 is that the impedance measuring device 16 in FIG. 1 is removed, and instead, contact confirmation pins 7a, 8a, 9a, and each test pin 7
．． 8.9 and each contact confirmation pin? The operation of the board tester configured as above 0, which is provided with contact failure inspection devices 7b, Bb, and gb connected to both of a, 8a, and 9a, will be described below. First, presser bar 17
When the printed circuit board l is pressed against the board tester stand 6, each test pin 7, 8, 9, 10 is connected to each test round 2.
, 3.4.5. Eventually each test pin 7.8.
When 9.10 slides a little, the internal contact confirmation pins 7at 8a and 9a each test pin 7.8.9 come into contact, and this is electrically detected by each contact failure inspection device, and each test pin 7.8.9 and each test round 2
．． 3. Confirm that there is no poor contact between 4 and 4. At the same time, the power switch 15 of the power supply 13 is turned on by the output of the contact confirmation device 14, and the power supply voltage is applied between the ground test round 4 and the power supply test round 5 via the ground test pin 9 and the power supply test pin 10. Added.

When the power supply voltage is applied, input/output signals are exchanged between the input/output signal test round 2.3 and the tester 12 via the input/output signal test pins 7.8, and the printed circuit board 1 is inspected for defects. Contact confirmation pins 7a, 8a, and 9a are provided inside the input/output signal test pin 7.8 and the ground test pin 9, respectively, as described above, and each test pin 7.8.9 and each contact Confirmation pin? a, 8a
, 9a, each contact failure inspection device 7b,
8b, 9b, each test pin 7.8.
9 and the printed circuit board 1 in each test round 2.3.4.

Effects of the Invention As described above, according to the present invention, by providing a means for switching the power switch when the power test pin contacts the test round and slides a little, it is possible to destroy the LSI etc. mounted on the printed circuit board to be tested. There is no longer any need to worry about this, and there is no need to manually operate the power switch. Further, by providing means for confirming that all test pins are in contact with each test round of the printed circuit board, there is no need to worry about unexpected malfunctions of the board tester due to poor contact of the test pins.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a board tester according to a first embodiment of the present invention, FIG. 2 is a block diagram of a board tester according to a second embodiment of the present invention, and FIG. 3 is a block diagram of a conventional board tester. It is. 1...Printed circuit board, 2.3...Test round for input/output signals, 4...Test round for ground, 5...Test round for power supply,
6...Board tester stand, 7.8...Test pin for input/output signals, 9...Test pin for ground, 10...Test pin for power supply , 11...
...Contact confirmation pin, 12...Tester, 1
3...Power supply, 14...Contact li! Authentication device, 15...Power switch, 16...
Impedance measuring device, 17...presser bar,
7a, 8a, 9a... Contact confirmation pin, 7b,
8b, 9b... Contact defect inspection device. Name of agent Patent attorney Shigetaka Awano 1 person l-°Print 11th 2~-S''-Test round 6-Test 7-10-Test pin TF---* Corner confirmation, pin 15--- t'1 Original switch 2nd figure f--Printed base" 议2~-5-Test round 1-M-Test mortar 7-/l--Beside the test pin, 9tt, lf--1 ri-J trap Claw pin ts---
*”a Swifte

Claims (5)

[Claims] (1) one or more input/output signal test pins, ground test pins, power supply test pins, a board tester stand to which these test pins are fixed, and a tester connected to all input/output signal test pins; A power supply connected to the ground test pin and power test pin, a power switch, a means to switch the power switch when the power test pin touches the test round and slides a little, and a printed circuit board to be tested on the board tester stand. A board tester equipped with a presser bar for pressing down. (2) The means for switching the power switch when the power supply test pin contacts the test round and slides a little is a contact confirmation pin installed inside the power supply test pin, and a contact confirmation pin and the power supply test pin. The board tester according to claim 1, comprising a contact confirmation device connected to both of the contact confirmation devices and controlling a power switch with its output. (3) one or more input/output signal test pins, ground test pins, power supply test pins, a board tester stand to which these test pins are fixed, and a tester connected to all input/output signal test pins; The power supply connected to the ground test pin and the power supply test pin, the power switch, the holding bar for holding the printed circuit board to be tested on the board tester stand, and all the test pins touching each test round of the printed circuit board. A board tester with a means to confirm that (4) The means for confirming that all the test pins are in contact with each test round of the printed circuit board comprises an impedance measuring device connected to all the test pins. board tester. (5) The means for confirming that all the test pins are in contact with each test round of the printed circuit board is the n contact confirmation pins inside all n test pins, each test pin and each The board tester according to claim 3, comprising n contact confirmation devices to which both of the contact confirmation pins are connected.