CN1042673C

CN1042673C - Test equipment

Info

Publication number: CN1042673C
Application number: CN92109095A
Authority: CN
Inventors: 陈子全; 林伟强
Original assignee: Xiandeli Science & Technology
Current assignee: Xiandeli Science & Technology
Priority date: 1992-03-20
Filing date: 1992-08-03
Publication date: 1999-03-24
Anticipated expiration: 2007-08-03
Also published as: GB9206068D0; KR930021047A; TW202532B; HK141396A; GB2265224B; KR100320075B1; CN1076785A; GB2265224A

Abstract

A probe (14) may be used to contact a printed circuit board (12) in both an isolation test (Figure 1) and a continuity test (Figure 2), a strip of conductive rubber (18) being used to provide a conductive bridge between certain points on the board in the continuity test. The rubber (18) may be arranged in grooves in a metal platform (16) which can be raised or lowered (20) as required.

Description

Proving installation

The present invention relates to be used for the test macro of circuit board unit such as printed circuit board (PCB) (PCB).

One object of the present invention is the PCB test rate that provides higher than some legacy test system.

Proving installation of the present invention comprises: to the equipment of circuit board enforcement out of circuit test, this out of circuit test equipment is used for same circuit board is implemented path testing with other equipment together.

This out of circuit test equipment comprises (or a plurality of) probe, and it also suitably contacts with circuit board, is used for any short circuit of check circuit plate.

For 2 points on the strap circuits plate, proving installation of the present invention also has the member of supporting at least one conductive rubber except the out of circuit test equipment of implementing path testing, be used for any rupture of line of check circuit plate.

Above-mentioned support member can move or remove from circuit board towards circuit board by air cylinder device.

Compare with prior art, the present invention can reduce the time that test process consumes.And, also reduced fixture and maintenance cost.

Each proving installation uses a tool miniature pneumatic formula cylinder, and it is driven by a by-pass valve of being controlled by complete computerized system.

Above-mentioned support member comprises also and is installed in a conductive material in the groove on the metal platform that the partially conductive material is exposed to the platform surface top, so that contact with circuit board.The effect of air cylinder device is that conductive material is pressed on the circuit board, so that realize the path testing of circuit board.

This device can accurately be tested all small-sized high density bare boards of making by SMT (surface mounting technology).This device is particularly suitable for and automatic conductive rubber pilot system (ACRT) is worked together.

The present invention's advantage is:

1. by the test loop number of minimizing system, make turnout and increase.

2. replace the part probe by conductive material, reduced the cost and the maintenance cost that cause by probe.This also has the another one advantage, because the density of some SMT pad is too high, so that the fine pith probe can not be used.And the present invention is not limited.

3. there is bigger error in the pattern displacement of allowing the unit in the test, and smooth test operation is provided.

4. in that being filled out, high density SMT (surface mounting technology) has higher accuracy when liner plate is tested.

5. because conductive material does not occupy any lead-in wire resource, so can increase the number of the test lead of this system.

6. reduce the maintenance process of conductive material system, therefore, can reduce maintenance cost and time.

The present invention is described embodiments of the invention referring now to accompanying drawing.In the accompanying drawings:

Fig. 1 is the side cross-sectional view (being its open-circuit test situation) of proving installation of the present invention;

Fig. 2 is the side cross-sectional view (being its path testing situation) of Fig. 1 device; And

Fig. 3 is the synoptic diagram of bare board.

Proving installation 10 shown in Fig. 1 and Fig. 2 can open circuit to printed circuit board (PCB) 12 and test and path testing.

Specifically, this device comprises that form is an open-circuit test member of probe 14, and this probe can move some point (consulting Fig. 1) on the contact print circuit board up and down.

In Fig. 2, represented that same device is carrying out path testing to printed circuit board (PCB).

In detail, this probe that opens circuit carries out path testing together with a member 16 that is supporting the hood-like thing 18 that is made of conductive rubber (but 2 points on this hood-like thing cross-over connection printed circuit board (PCB)) acting in conjunction.

Proving installation of the present invention also comprises a cylinder mechanism 20, in order to move up and down support member 16, makes it to shift to and move apart printed circuit board (PCB).

Whole device is controlled by a system controller.Below this system controller is described in detail.

System controller

This system controller unit is by checking that one is confirmed to the parameter " ACRT state " in " product configuration " submenu whether the user has selected test function.

If " ACRT state " is set at " opening ", then system controller will be tested and learn the printed circuit board (PCB) with ACRT function.

When using ACRT, will learn printed circuit board (PCB) with two kinds of various process.Specifically, have in the data file of printed circuit board (PCB) of ACRT function and comprise two groups of different data.At first learn the data (data 1) when 12 of conductive rubber 18 and tested plates are contactless, the data (data 2) when learning then to contact between conductive rubber and tested plate.

When test,, use two kinds of different processes to test printed circuit board (PCB) according to two groups of different data.At first, conductive rubber is contacted with tested plate, and, begin test according to the information of data 2.Then, conductive rubber is not contacted with tested plate, and test according to data 1.

System controller is being controlled the state of the cylinder in the device.If conductive rubber 18 is contacted with tested plate 12, then controller can send a signal, and cylinder is moved up; If not, controller can send the another one signal, and cylinder is moved down.

The effect of pneumatic cylinders 20 concrete manoeuvring platforms 16, it is under the control fully of computing machine.This structure make test operation can be in the one-period of many adequacy tests optimization.

With reference to Fig. 3, the part of the printed circuit board (PCB) 12 of diagram expression is tested.Specifically, two adjacent SMT pads 22 and 24 corresponding terminals or branch terminal contact with 28 by test prod 26 on the printed circuit board (PCB).A special electric conductor 30 is as " conduction cross-over connection/short circuit " element between two SMT pads 22 and 24.

Study and process of the test comprise two kinds of stages.In the phase one, conductive material 30 and each SMT pad (promptly 22 and 24) contact, so that a short circuit path is provided between each SMT pad." open circuit/short circuit " reading on every test probe is processed to be first group data (that is: path testing).In subordinate phase, that special electric conductor 30 and each SMT pad (that is: 22 and 24) is isolated.Another " open circuit/short circuit " reading on every test probe is treated as second group data (that is: routine tests).

Test procedure will adopt two groups of such data as benchmark, compare with the data that the unit produced tested in two stages.Yet all above-mentioned test phases do not need to remove tested unit or mobile device (except the drum casing).This set mechanism only finishes test in one-period.

Operation

Study have the ACRT function test procedure:

A. select the correct parameter of " system configuration " and " product configuration ".In the submenu " product configuration ", " ACRT state " should be set at " opening ".

B. chooser menu " test/study ".

C. select " beginning study " project.

D. the printed circuit board (PCB) with " known good " installs on the device.

E. make cylinder push conductive rubber, be close to mutually with printed circuit board (PCB).

F. when finishing study, machine can show the short dot quantity and the open circuit point quantity of printed circuit board (PCB), and for example has short dot to exist, and then checks total error.

G. store the test pattern.

2. test printed circuit board (PCB) with ACRT function:

A. pack into tested test plate (panel) data file (if it is stored on the disk) otherwise, before test, learn this plate.

B. select the correct parameter in " system configuration " and " product configuration ".Guarantee: " ACRT state " in the submenu " product configuration " is set at " opening ".

C. chooser menu " test/study ".

D. select " beginning test " project.

E. with a printed circuit board the device on.

F. make cylinder push conductive rubber, be close to mutually with printed circuit board (PCB).

G. when end of test (EOT), cylinder (cylinder) can make progress, and machine can show that whether this plate is by test.

The advantage of this machine can be seen by following each point:

1. save the pitch probe, thereby reduced test probe and maintenance cost thereof.

2. build this device and become easily, the especially control of tolerance limit degree is so that cost can Save.

3. because conductive material does not occupy any lead-in wire resource, so in fact can increase The number of the test lead of this system.

4. the pattern shift error owing to the tested unit of ACRT permission is bigger, so Can alleviate the pressure that produces because of the strict control to error in the production, and greatly subtract The good plate of major general is considered as the probability of defective work.

5. safeguard easily (only replacing conductive material), thereby the production operation smoothness carried out, Maintenance cost also can reduce.

ACRT is a kind of printing electricity with SMT (surface mounting technology) that is used for testing The road plate, be arranged on chip on board (COB) on single face, the two-sided and multilayer circuit board Good instrument.

Claims

1. proving installation, comprise a testing apparatus of circuit board being carried out open-circuit test and circuit test, wherein said testing apparatus comprises first test component and second test component, thereby this first test component comprises that at least one is used for contacting with certain point on the circuit board carries out the probe of out of circuit test, this first test component then continues to contact with circuit board, second test component also contacts with circuit board simultaneously, with the together execution path test of first test component.

2. the proving installation described in claim 1, wherein said out of circuit test equipment are certain any the probes on the contact circuit plate.

3. the proving installation described in claim 1 or 2, the wherein said equipment that carries out path testing with out of circuit test equipment be one supporting at least one with circuit board on the parts of two contacted conductive rubbers of point.

4. the proving installation described in claim 3, wherein said support component can move and remove from circuit board under the driving of cylinder group to circuit board.

5. proving installation as claimed in claim 4, wherein said cylinder group are pneumatic cylinders, and it is driven by the bypass valve that complete computerized system controlled by one.

6. as each the described proving installation in the claim 1, wherein said support component also comprises the conductive material in several grooves that are installed in a metal platform.

7. the proving installation described in claim 6, wherein, the partially conductive material is exposed on the surface of platform, so that contact with tested circuit board.

8. proving installation as claimed in claim 1, cylinder group wherein is pressed in conductive material on the tested circuit board.