CN201199246Y

CN201199246Y - Density changeover mechanism for PCB tester

Info

Publication number: CN201199246Y
Application number: CNU2008200099939U
Authority: CN
Inventors: 武勇; 潘海; 胡泉金
Original assignee: SHENZHEN MASON ELECTRONICS CO Ltd
Current assignee: SHENZHEN MASON ELECTRONICS CO Ltd
Priority date: 2008-05-06
Filing date: 2008-05-06
Publication date: 2009-02-25
Anticipated expiration: 2018-05-06

Abstract

The utility model relates to a density transformation mechanism for a PCB testing machine, which comprises an upper layer and a lower layer. The upper layer is a spring-connected dial plate, the lower layer is a conversion circuit board and the upper layer is arranged on the lower layer through a seat tripod and superposed on a needle bar of the testing machine; the upper surface of the spring-connected dial plate is provided with a reticular through hole corresponding to a probe of a test fixture, a spring-restoration device, the main body of which is a spring having relatively good electric conductivity, is fixedly arranged in the through hole, and the spring goes against a corresponding contact at the upper layer of the conversion circuit board; the conversion circuit board consists of a base, an upper layer and a lower layer, the upper layer of the circuit board is provided with a reticular contact corresponding to the through hole of the spring-connected dial plate, the lower layer thereof is provided with a reticular contact corresponding to the probe of the needle bar of the testing machine and wires are arranged in the base to connect the contacts of the upper layer and the lower layer. The transformation mechanism guarantees excellent electrical connection among the probe of the test fixture, the contract of the conversion circuit board and the probe of the needle bar of the testing machine, and therefore the practical reliability of the transformation mechanism is greatly increased.

Description

The density throw-over gear of PCB test machine

[technical field]

The utility model relates to a kind of printed circuit board (PCB) (Printed Circuit Board; PCB) field tests refers in particular to a kind of PCB test machine density throw-over gear.

[background technology]

In PCB test industry, the test point standard that a kind of standard universal is arranged---four density (promptly arranging 400 test contact points equably) at 1 square inch, and each test point must be connected with waiting test circuit, and existing P CB board test apparatus all is by line the test circuit pin directly to be soldered to the test contact point to carry out test job, yet now the integrated level of circuit board is more and more higher, solder joint is more and more littler, density is close more, and the development of pcb board test machine often has certain hysteresis by contrast, the price of pcb board test machine is very high in addition, use enterprise often can't bear the update to corresponding test machine, but this means that also enterprise is missing a chance, even causes enterprise to be defeated in the spring tide of the market of cut-throat competition.How by original test machine is done its adaptation or part are adapted to increase fast in more the testing requirement of high density solder joint PCB become and be badly in need of the matter of utmost importance that solves in the industry.

[summary of the invention]

The purpose of this utility model is to have overcome above-mentioned defective, and a kind of PCB test machine density throw-over gear is provided, under the situation that has realized need not original test machine body is changed, and the purpose that can test the high density pcb board.

The purpose of this utility model is achieved in that a kind of PCB test machine density throw-over gear, its improvements are: it comprises two-layer up and down, the upper strata is that spring connects dials, and lower floor is the change-over circuit plate, and the upper strata is set up on the lower circuit plate by seat leg and is stacked and placed on the test machine needle-bar; Described spring connects the corresponding test fixture probe of dials upper surface and is provided with netted open-end hole, the through hole internal fixation is provided with spring reverse motion, the main body of spring reverse motion is a spring that has better electric conductivity, the spring upper end is used to contact the test fixture probe, and the lower end overhead is on the corresponding contact on change-over circuit plate upper strata; Described change-over circuit plate comprises basic unit, upper strata and lower floor, the corresponding spring in circuit board upper strata connects the dials through hole and is provided with netted contact, lower floor then is provided with the netted contact of corresponding test machine needle-bar probe, netted contact is used for pressing to touch on test machine needle-bar probe being electrically connected, and is placed with in the change-over circuit plate basic unit to be used for the corresponding lead that links to each other in the contact of levels;

Described change-over circuit plate is a PCB change-over panel, and the contact of its levels protrudes from the surface of pcb board;

Be provided with the boss that is used for the clamping spring reverse motion in the described spring connection dials netted open-end hole;

The spring of described spring reverse motion, its upper end are a little less than conversion dials upper surface, and the spring lower end is shunk and formed the spring section of a diameter less than through hole boss section internal diameter, and this minor diameter spring section stretches out in outside the lower surface of conversion dials;

Described spring upper end is shunk and is formed with the needle holder that is used for bearing test anchor clamps probe.

Beneficial effect of the present utility model really is also to provide a kind of PCB test machine density throw-over gear, this throw-over gear is two-layer up and down, the upper strata is that a spring connects dials, lower floor is the change-over circuit plate, the circuit board lower floor direct roof pressure in contact is on test machine needle-bar surface-probe, the contact, upper strata then links to each other with the test fixture probe by the spring reverse motion in the spring dials, during test not only the resetting means in the spring dials be in an impaction state, and the probe that the test machine needle-bar protrudes becomes the impaction state of inside indentation under the buffering of its lower spring, make the test fixture probe, can eliminate the gap that be produced by the effect that resets certainly of spring when the trace change takes place the vertical direction relative position between change-over circuit plate contact and test machine needle-bar probe, thereby still keep the good purpose that is electrically connected, the reliability when having increased this throw-over gear practical application greatly therebetween.

[description of drawings]

Below in conjunction with drawings and Examples the utility model is described further.

Fig. 1 is an one-piece construction synoptic diagram of the present utility model.

Fig. 2 is a b-b cross-sectional schematic shown in Figure 1.

Fig. 3 is an a-a cross-sectional schematic shown in Fig. 1.

Fig. 4 is that the spring of the utility model specific embodiment connects dials inner structure synoptic diagram.

[embodiment]

A kind of PCB test machine density throw-over gear, this density throw-over gear is arranged at 4 of test machine needle-bar 1 and test fixtures, referring to Fig. 1, it comprises two-layer up and down, the upper strata is that spring connects dials 3, lower floor is a change-over circuit plate 2, and spring connects on dials 3 and the lower circuit plate and is stacked and placed on the test machine needle-bar 1.

Described change-over circuit plate 2 comprises basic unit, upper strata and lower floor's three-decker, its upper strata higher test fixture probe 401 of corresponding density is provided with netted contact 201, referring to the b-b cut-open view among Fig. 2,202 of the netted contacts of lower floor are test machine needle-bar probe 101 corresponding are provided with lower with density, referring to the a-a cut-open view in the corresponding diagram 1, its change-over circuit plate 2 levels contacts 201,202 protrusions and circuit board surface and corresponding linking to each other of lead by arranging in the basic unit.

As shown in Figure 4, described spring connects the corresponding test fixture probe 401 of dials 3 upper surfaces and is provided with netted open-end hole 302, through hole 302 internal fixation are provided with spring reverse motion 301, the main body of spring reverse motion is a spring 5 that has better electric conductivity, spring 5 upper ends are formed with the needle holder that is used for bearing test anchor clamps probe 401 a little less than dials 3 upper surfaces and contraction, its lower end is shunk and is formed the spring section of a diameter less than 303 sections internal diameters of boss of through hole 302, and this minor diameter spring section stretches out in outside the lower surface of dials and overhead on the contact 201 on change-over circuit plate 2 upper stratas.

This throw-over gear when in use, spring in its spring line dials is under the compressive state, prevented the clearance issues that it in use may produce between test fixture probe and the terminal contacts on the change-over circuit plate is corresponding thus, this external test machine needle-bar probe 101 its inner spring under the pressure of change-over circuit plate 2 also is in the state of a compression, thereby having guaranteed that test machine needle-bar and change-over circuit plate two ends probe and contact are seen can be under the situation of vertical direction generation relative displacement still guarantee good being electrically connected therebetween.

In sum, the utility model provides a kind of simple and effective PCB test machine density conversion method and throw-over gear thereof, this throw-over gear is by the firm and hard conversion purpose that has showed height density measurement point of change-over circuit, and guaranteed that for this change-over circuit plate has disposed spring connection dials the test fixture probe is connected with good electrical between the change-over circuit plate contact.Owing to be to adopt the firm and hard existing density conversion of change-over circuit herein, circuit board is positioned at the contact of test fixture one side except more high density is arranged, also can not be subject to the requirement of consistent in density, but can lay the test point in multiple different densities zone at the corresponding test fixture end in the upper strata of change-over circuit plate according to actual needs, be connected on the unified contact of lower floor's density corresponding by winding displacement conversion in the change-over circuit plate basic unit then, thereby realize the shared test of multi-density with test machine needle-bar probe.It is to be noted at last, because the change-over circuit plate in the related throw-over gear of the utility model, the annexation of its levels terminal contacts can be adjusted decision by wiring in the basic unit, so the throw-over gear circuit board that the utility model is set forth can not only realize that the multiple density of corresponding test fixture is shared, can also be implemented under the situation that does not reduce test area by the multiplexing method in contact and highdensity test target changed and carry out corresponding test job.

Claims

1. PCB test machine density throw-over gear is characterized in that: it comprises two-layer up and down, and the upper strata is that spring connects dials, and lower floor is the change-over circuit plate, and the upper strata is set up on the lower circuit plate by seat leg and is stacked and placed on the test machine needle-bar; Described spring connects the corresponding test fixture probe of dials upper surface and is provided with netted open-end hole, the through hole internal fixation is provided with spring reverse motion, the main body of spring reverse motion is a spring that has better electric conductivity, the spring upper end is used to contact the test fixture probe, and the lower end overhead is on the corresponding contact on change-over circuit plate upper strata; Described change-over circuit plate comprises basic unit, upper strata and lower floor, the corresponding spring in circuit board upper strata connects the dials through hole and is provided with netted contact, lower floor then is provided with the netted contact of corresponding test machine needle-bar probe, netted contact is used for pressing to touch on test machine needle-bar probe being electrically connected, and is placed with in the change-over circuit plate basic unit to be used for the corresponding lead that links to each other in the contact of levels.

2. PCB test machine density throw-over gear as claimed in claim 1 is characterized in that: described change-over circuit plate is a PCB change-over panel, and the contact of its levels protrudes from the surface of pcb board.

3. PCB test machine density throw-over gear as claimed in claim 1 is characterized in that: be provided with the boss that is used for the clamping spring reverse motion in the described spring connection dials netted open-end hole.

4. PCB test machine density throw-over gear as claimed in claim 3, it is characterized in that: the spring of described spring reverse motion, its upper end is a little less than conversion dials upper surface, the spring lower end is shunk and is formed the spring section of a diameter less than through hole boss section internal diameter, and this minor diameter spring section stretches out in outside the lower surface of conversion dials.

5. PCB test machine density throw-over gear as claimed in claim 4 is characterized in that: described spring upper end is shunk and is formed with the needle holder that is used for bearing test anchor clamps probe.