CN1405573A

CN1405573A - Testing method with increased testing density

Info

Publication number: CN1405573A
Application number: CN 01120698
Authority: CN
Inventors: 吴志成; 杨昌国
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-08-13
Filing date: 2001-08-13
Publication date: 2003-03-26

Abstract

A method for increasing testing density used in testing a special body with multiple points to be tested includes the following steps: providing multiple needles at least with one tilt needles, electrically connected with the points to be tested of the special body to be tested, providing multiple spring element with a first and second ends for each element, the first end is under the needles and each needle has spring recovery, providing multiple conductive elements set with up end and low end at each conductive element, the up end is electrically connected with the second end of the related spring element enabling transferring test signals to the test device via conductive elements.

Description

Improve the method for testing of test density

Invention field

The present invention is a kind of method of testing that improves test density, is meant a kind of method that can significantly reduce testing cost and improve test density especially.

Background technology

General printed circuit board (PCB) after finishing circuit cloth and planting, but for determining all normallies of every circuit, must be tested usually, the printed circuit board (PCB) that electronic circuit is intact is chosen, and each electronic component is fixed on the printed circuit board (PCB) again.

It is described to consult Fig. 1, the measurement jig of traditional printed circuit board (PCB), and it includes a needle plate 10, most individual probe 12 and clamping plate 14.Be preset with the pin hole 16 of tested point 13 positions of corresponding determinand 11 (present embodiment is a printed circuit board (PCB)) on this needle plate I0, most probes 14 are made up of probe sleeve 18, syringe 20, spring 22 and needle body 24.Probe sleeve 18 is to be inserted in the default pin hole 16 of needle plate 10, and the one end is provided with lead 19, in order to signal is passed to test machine (figure does not show); Spring 22 is to be placed in the syringe 20, needle body 24 is to be inserted in the syringe 20, by the contractility of spring 22, makes needle body 24 have the restoring force of elastic telescopic in syringe 20, and this syringe 20 is to be fixed in the probe sleeve 18, finishes whole probe 12 is fixed on the needle plate 10.Also be preset with the pin hole 16 corresponding folder holes 26 with needle plate 10 on the clamping plate 14, and needle body 24 is the folder holes 26 that pass clamping plate 14, protrudes from clamping plate 14, and passes the default perforation 17 of top board 15.Printed circuit board (PCB) 11 is arranged at top board 15 tops, contact with the needle body 24 of probe 12 by the tested point 13 of Measurer printed circuit board (PCB) 11, and electric signal is passed to spring 22, probe sleeve 18 in regular turn, the lead 19 that is connected by probe sleeve 18 bottoms is passed on the test machine, judge whether conducting of tested point by test machine, to finish the test jobs of printed circuit board (PCB) 11.Traditional measurement jig has following shortcoming:

When 1, contacting with the tested point 13 of determinand 11 owing to probe 12, the contractility that must have elastic recovery, to prevent damaging the electrical of tested point 13, therefore, needle body 24 must be located in the syringe 20 with spring 22, after needle body 24 is compressed, can move certainly and stretch answer, it is quite tiny to cause the volume of whole probe 12 to make, or is made into when quite tiny, its relative cost is very high, so that causes the raising of testing cost and can't promote the survey pseudodensity.

2, because probe sleeve 18 needs to cooperate the size design of probes 12, and therefore, its size also relatively is restricted, so that the global density of the pin hole 16 of needle plate 10 can't improve, and will cause the circuit board 11 that can't test high density tested point 13.

3, the electric signal of the tested point 13 of printed circuit board (PCB) 11 is the transmission that electrically contact by element combinations with one another such as needle body 24, flexible member 22, sleeve 20, probe sleeves 18, after transmitting through the contact of multiple tracks, to cause signal to transmit bad phenomenon, so that influence the test quality of printed circuit board (PCB), especially when the highdensity tested point of test, its effect is better unclear.

4, probe 12 is to be fixed on the needle plate 10 to dismantle, and therefore, after the printed circuit board test of item number finishes by the gross, needle plate 10 and most probes 12 can't be exercised usefulness again, cause the raising of testing cost and the waste of resource.

5, probe 12 is to contact with printed circuit board (PCB) 11 rectilinearly, therefore, if when most tested point 13 density of printed circuit board (PCB) 11 are high, probe must be made quite tinyly, causes the manufacturing cost of probe 12 quite high.

Summary of the invention

The inventor creates the method for testing of raising test density of the present invention at above-mentioned shortcoming.

Fundamental purpose of the present invention provides a kind of method of testing that improves test density, by a kind of tool that improves test density is provided, overcome the drawback of prior art, reach the purpose of the usefulness again of making convenient, as effectively to reduce production costs, improve test conduction and recyclable measurement jig.

The object of the present invention is achieved like this: a kind of method of testing that improves test density, it is characterized in that: it comprises the following steps:

(1) provide most needle bodies, this at least one needle body is to be provided with in the inclination mode, makes it be electrically connected on the tested point of this determinand;

(2) provide most flexible members, this each flexible member is provided with first end points and second end points, and this first end points is to be positioned at this needle body below, makes this each needle body have elastic-restoring force;

(3) provide most conducting elements, this each conducting element is provided with upper extreme point and lower extreme point, and the upper extreme point of this each conducting element is second end points that is electrically connected on corresponding flexible member respectively, will test signal by being passed to test machine by this conducting element.

This flexible member is to be arranged in the pin hole of a needle plate device.This needle plate device is laid with the pin hole corresponding to most tested points of this determinand.This needle plate device is densely covered with the pin hole of latticed criss-cross arrangement, and this flexible member is in the pin hole that is arranged at corresponding to most tested points of this determinand.This conducting element is a lead.This each needle body is to be arranged in the folder hole of a fixation device in the inclination mode.This fixation device is provided with soft board, and this needle body pierces through this soft board, and is clamped by this soft board.First end points of this flexible member has dragging to this probe of portion's correcting that internal diameter dwindles.By with the tested point of needle body, can test the determinand of high density tested point with inclination mode contact measured thing.

Further specify below in conjunction with preferred embodiment and accompanying drawing.

Description of drawings

Fig. 1 is the decomposing schematic representation of traditional test tool.

Fig. 2 is the decomposing schematic representation of measurement jig of the present invention.

Fig. 3 is the combination cross-sectional schematic of measurement jig of the present invention.

Fig. 4 is the usage operation synoptic diagram of Fig. 3.

Fig. 5 is the decomposing schematic representation of the measurement jig of embodiments of the invention 2.

Embodiment

Embodiment 1

Consult Fig. 2-shown in Figure 4, the tool of raising test density of the present invention is the determinand 28 that has most tested points 29 in order to test, determinand 28 can be printed circuit board (PCB), semiconductor encapsulated element or wafer, this method of testing provides a kind of tool, and this tool includes a needle plate device 30, most probes 32, most bar flexible member 34, fixation device 36 and most support columns 39;

Needle plate device 30 is made up of needle plate 42 on the needle plate 40 and in the needle plate once 38,, following needle plate 38 is densely covered with the lower pinhole 44 of latticed criss-cross arrangement, each lower pinhole 44 spacing can be 1.27mm or below the 1.27mm, tests to be suitable for more highdensity tested point 29.Middle needle plate 40 is to be stacked and placed on down needle plate 38 tops, also be densely covered with crisscross middle pin hole 46 on it, in the diameter of pin hole 46 be big than lower pinhole 44, pin hole 46 spacings can be 1.27mm or below the 1.27mm, test to be applicable to more highdensity tested point 29 in each.Last needle plate 42 is the tops in order to needle plate 40 in being stacked and placed on, also be densely covered with the last pin hole 48 of criss-cross arrangement on it, the middle pin hole 46 of the diameter of last pin hole 42 is little, and its spacing can be 1.27mm or below the 1.27mm, to be applicable to 29 tests of highly denser tested point.

Most bar flexible members 34, it is provided with first end points 50 and second end points 52, first end points 50 has and drags to portion 54, second end points 52 is the upper extreme points 58 that are electrically connected on a conducting element 56, in the present embodiment, conducting element 56 is a lead, the middle needle plate 40 that the lead 56 that is connected with flexible member 34 is worn corresponding to tested point 29 reaches the middle pin hole 46 of needle plate 42 down, lower pinhole 44 positions, second end points 52 of flexible member 34 is just propped up by lower pinhole 44, and be located in the middle pin hole 46, can in middle pin hole 44, moving as elastic recovery, last needle plate 44 is needle plate 40 tops in being covered on, to limit flexible member 34, prevent that it from coming off from middle pin hole 46.The lower extreme point 60 of conducting element 56 is on the winding displacement (figure does not show) that is directly connected in test machine, is passed on the test machine in order to the electric signal with tested point 29.

Fixation device 36 comprises train wheel bridge 62, soft board 64 and lower plate 66, train wheel bridge 62 and lower plate 66 are provided with upper clamping hole 70 with respect to individual tested point 29 positions of the majority of determinand 28 and reach folder hole 72 down, soft board 64 then is located at 66 of train wheel bridge 62 and lower plates, and upper clamping hole 70 reaches folder hole 72 tool appropriate tilt down, make to go up pin hole 48, folder hole 72 and upper clamping hole 70 form suitable slope down, and form the straight line of inclination with the tested point 29 of the determinand 28 that is positioned at fixation device 36 tops.

A most probe 32 are the needle body of copper metal, and its surface plating is provided with the nickel metal, makes its conduction better.A most probe 32 are provided with first end points 74 and second end points 76, first end points 74 is that tested point 29 positions according to determinand 28 wear the upper clamping hole 70 that is fixed in train wheel bridge 62 and lower plate 66 respectively and down in the folder hole 72, and pierce through soft board 64, and be clamped by soft board 64, and be arranged in the pin hole 48, electrically contact in order to second end points 52, make probe 32 form with flexible member 34.Second end points 76 is to protrude train wheel bridge 62, in order to contact with the tested point 29 of determinand 28.

The suitable distance in fixation device 36 tops is provided with top board 37, and most tested point 29 positions with respect to determinand 28 on the top board 37 are preset with perforation 41, makes first end points 76 of probe 32 protrude top board 37, in order to contact with special measuring point 29.

Support column 39 is to be arranged at down the bottom that needle plate 38 is not provided with flexible member 34, in order to support and to strengthen needle plate 30, makes needle plate 30 press down when stressed unlikely breakage at determinand 28.

Cooperate and consult Fig. 3,4, probe 32 is to be inserted in obliquely in the upper clamping hole 70 and following folder hole 72 of fixation device 36, and pierce through soft board 64, make first end points 74 of probe 32 compress dragging of flexible member 34 and protrude top board 37 in the inclination mode to portion's 54, the second end points 76.And determinand 28 is to place top board 37 tops, make second end points 76 of the corresponding probe 32 of tested point 29 alignings on it, and probe 32 is contacted with the object point to be measured 29 of determinand 28, signal is passed to flexible member 34, the conducting element 56 that second end points 52 by flexible member 34 is connected, signal is passed to interpretation on the test machine, to judge whether conducting of tested point 29.

First end points 74 of probe 32 is contacts and compresses the dragging to portion 54 of flexible member 34, makes probe 32 in course of action, can be by flexible member 34 correcting automatically.

By setting by pin hole 48, following folder hole 72,

upper clamping hole

70 and 41 positions of boring a hole, make probe 32 contact with the tested point 29 of determinand 28, can on the area of same needle panel assembly 30, test the more determinand 28 of high density tested point 29 in the mode that tilts.

Embodiment 2

Consult shown in Figure 5, be another embodiment of the present invention, needle plate device 30 also reaches upward by following needle plate 38, middle needle plate 40, and needle plate 42 combines, but its lower pinhole 44, middle pin hole 46 and to go up pin hole 48 be that tested point 29 positions according to determinand 28 are drilled with, in the pin hole 46, be to be another embodiment of the present invention in again flexible member 34 being inserted according to aforesaid mode.

By tectonic association as above, the present invention has following advantage:

1, flexible member 34 is inserted in the pin hole of needle board device 30, again with probe 32 directly with Flexible member 34 contact conductings, probe 32 structures are simple, can be made into quite tiny, and its manufacturing Cost is quite cheap, can effectively reduce testing cost.

2, flexible member 34 directly is connected with lead 60, therefore, and the signal transmission of tested point 29, Only pass through the conduction of probe 32 and flexible member 34, thereby can obtain better signal transmission effect, Test effect and promote.

3, the pin hole of the default criss-cross arrangements of needle board device 30, therefore, can be according to tested point 29 The position places flexible member 34 in the corresponding pin hole, probe 32 is placed to be provided with elasticity unit again On the position of part 34 and the group measurement jig, in this way, needle plate 30 can cooperate the determinand of different item numbers heavy Cover use, to reduce testing cost.

4, since probe 32 to can be made into technically suitable tiny and cost quite cheap, therefore, Can improve the test density of test point 29.

5, the pin hole of the criss-cross arrangement of needle board device 30, it optionally inserts flexible member 34 And probe 32, therefore, the perforated bottom that is not provided with flexible member 34 can arrange support column 39, as This can improve the density of pin hole, with the higher tested point 29 of test density.

6, probe 32 is inserted in upper clamping hole 70 and the lower folder hole 72 of fixation device 36 in the inclination mode In, can be in order to the determinand 28 of testing high density tested point 29.

Take a broad view of above explanation, the tool that the present invention can improve test density really can reach purpose of the present invention and Effect has novelty and creativeness.

Claims

1, a kind of method of testing that improves test density, it is characterized in that: it comprises the following steps:

2, the method for testing of raising test density according to claim 1 is characterized in that: this flexible member is to be arranged in the pin hole of a needle plate device.

3, the method for testing of raising test density according to claim 1 is characterized in that: this needle plate device is laid with the pin hole corresponding to most tested points of this determinand.

4, the method for testing of raising test density according to claim 2 is characterized in that: this needle plate device is densely covered with the pin hole of latticed criss-cross arrangement, and this flexible member is in the pin hole that is arranged at corresponding to most tested points of this determinand.

5, the method for testing of raising test density according to claim 1 is characterized in that: this conducting element is a lead.

6, the method for testing of raising test density according to claim 1 is characterized in that: this each needle body is to be arranged in the folder hole of a fixation device in the inclination mode.

7, the method for testing of raising test density according to claim 1 is characterized in that: this fixation device is provided with soft board, and this needle body pierces through this soft board, and is clamped by this soft board.

8, the method for testing of raising test density according to claim 1 is characterized in that: first end points of this flexible member has dragging to this probe of portion's correcting that internal diameter dwindles.