JPS60190876A - Apparatus for inspecting printed wiring board - Google Patents

Abstract

PURPOSE:To bring a desired checker pin corresponding to an article to be inspected into contact with a part to be insepected, by mounting a shape memory alloy, of which the configuration changes by an ambient temp. state and a heating state, in correlation with the checker pin and providing a means for heating said alloy. CONSTITUTION:The leading end part 20 of a checker pin 20 is formed so as to be tapered toward a part 2 to be inspected and can be certainly contacted with the part 2 to be inspected. The probe 28 having the checker pin 20 is connected to a guide rod 29 extending to a downward direction. The guide rod 29 is surrounded by a coil 31 between a ring shaped projection 33 and a movable disc 24 and further surrounded by a coil 32 below the movable disc 24. One end part of the coil 32 is fixed to the movable disc 24 and the other end part thereof is fixed to the lower end part of a cylinder 23. The coils 31, 32 are made of a shape memory alloy and contracted when heated by power. Therefore, the checker pin 20 is retracted by the coils 31, 32, to which a current is supplied, before reaches the part 2 to be inspected and the supply of a current is stopped at said position to make it possible to impinge the pin 20 to the part 2 to be inspected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an inspection device for inspecting the concavities of the traces of a printed circuit board followed by circuit elements, and more particularly to A detection method that effectively detects one word by applying the entire checker bin to the electrode part [ (
It relates to a fully equipped inspection device (hereinafter referred to as a fixture).

Background technology A typical fixnayer is shown in FIG.

In the fixture shown in FIG. 1 (1), the substrate 1 to be measured is fixed at a predetermined position, a pump (not shown) is operated, and a hose 4 is used to pump air between the movable plate 2 and the fixed plate 3. suction through. Therefore, the board 1 also moves down along with the movable plate 2.
The test probe 5 and the test probe part 6 of &kari collide. The test probe 5 is connected to an interface board 8 by a reading line 7, and the interface port 8 is further followed by a tester (not shown).

In such prior art, it is necessary to replace the entire fixture every time the printed wiring board model is replaced.

In the case of high-mix, low-volume production, the cost of fixtures becomes high. Also, a large number of fixtures must be prepared and their locations must be considered. Furthermore, replacement work is troublesome.

In the dragon fixture shown in Fig. 1 (2), check pins 9 are set up for the least common multiple of several types of boards, and unnecessary checker bins 10 are covered with mask plate 1-11. I try not to touch anyone privately.

In such prior art, mask play for each Tatsuki species) 1
It is possible to detect signals from the pattern's extreme portions by simply exchanging 1. However, mask play)
11(7) Removal and installation are complicated and are not suitable for use as inspection equipment in automated factories.

In the fixture for the j, Rusara song shown in FIG. 1 (3), checker bins 15 are placed in advance on the north grid,
Each (1 sinker 71 (
Interface bin 18 and 10 self-installed board 14
is used to switch the wiring between the checker bin 15 and the tester.

In such advanced 1J technology, by replacing the board 14, all machines (1-iJ compatible with cars) can be installed, but the first
As with the fixture shown in Figure (2), the work of removing and removing the fixture is complicated, making it inadequate as an inspection device in an automated factory.

Purpose An object of the present invention is to solve all of the above-mentioned technical problems and to provide a printing arrangement 411i that allows a desired checker bin to be brought into hard contact with a portion to be inspected corresponding to each object to be inspected. It is an object of the present invention to provide an inspection device for a foundation board.

Embodiment FIG. 2 is a cross-sectional view of a portion of a fixter according to the present invention. A plurality of insertion holes 22 are formed in the pin board 21. The insertion holes 22 are formed at positions corresponding to a plurality of portions 18 to be inspected that are predetermined when the printed wiring board 16 is designed. A cylinder 23 is fixed to the insertion hole 22 . One end of this cylinder 23 protrudes from the insertion hole 22. A probe 28 is inserted into this cylinder 23 .

The probe 28 includes a checker bin 26 that can touch the part 2 to be inspected, and a checker bin 26'f: m inspection part 2.
It includes a coil spring 27 and gold that springs toward it. The northern tip 20 of the checker bin 26 in FIG.
The ftL inspection part is tapered to 18 degrees. This causes the checker bin 26 to open the limbs in the portion 18.
Make sure to limit your exposure to only those areas. The lower end of the insertion hole 22 on the inner peripheral surface of the cylinder 28 (near -1j, the annular protrusion 3
3) is lowered, and the annular projection 33 prevents the probe 28 from descending below the annular projection 33 area.

The probe 28 is provided with two guide rods 29b 7' extending downward in FIG. Center of guide rod 29 (,]
The moving board 24 is fixed near the moving board 24!
The terminal 25 protrudes from the outer peripheral surface of the cylinder 23 through a long hole 30 formed in the cylinder 23. One end of the wrapping wire 45 is terminal 2
5, and its curved end is tested by a tester (not shown). The checker bin 26 is electrically connected to the wrapping pulse 45 through the guide rod 29 and the terminal 25.
Ru. Between the annular projection 33 and the movable platen 24, the guide rod 2
9 is surrounded by a coil 31. One end of the coil 31 is fixed to the annular projection 33, and the llh 1711u portion is fixed to the cutting board 24. In the lower part of the moving board 24 in the audience 2 figure, the guide rod 29 is surrounded by a core half 32. One end of the coil 32 is fixed to the movement platen 24, and a stubby end is fixed to the lower end of the cylinder 23. The coil 7 and 31 are made of a shape memory alloy.
It has a structure that can give it a certain amount of power. The shape memory alloy used here has a property that the coils 31 and 32 deform into a contracted state when heated under stress.

FIG. 2 shows a state in which the coil 32 is degenerated by applying a mixed pressure to the coil 32.

A fixed base 34 is fixed near the bottom of the cylinder 23, and a support plate 85 is mounted on the opposite side of the fixed base 84. Fixed stand 3
4. The support plate 35 is provided with insertion holes 84a and 851d, respectively. Right fu in FIG. 2 of support plate 35
The end of ll is fixed by a coil 36 made of a base metal. The left end of the support plate 35 in FIG. 2 is fixed by a coil 7 to 87 made of a saw-shaped memory alloy. The ends of each of the coils 86 and 87 are fixed by a fixing base 34, and by applying force and heating the coils 86 and 87, the coils assume a contracted shape. In FIG. 2, gravity is applied to the coil 36, and in this state (the middle 1st hole 34a, 85aK + inner shaft 29 is passed through the middle hole 34a, The guide rod 29 is inserted through the coil 35a and applies one force to the coil 32.
IJ is placed below μ, and the check box 26 is housed 11 in the insertion hole 22 in this face down position.

In FIG. 3, the checker bin 26 is connected to the printed wiring board 16''2/
-) It is a diagram showing a protruding face-down 1 table that is turned around to the Qingei Shoku portion 18. Printing JA provisional 16 "Inspecting the indenter U path reflection function, printing 1 JAvi 16υThe checker bottle 26 is fixed to the predetermined hanging part 18" The sea urchin board 21 is in its original state. By giving the coil 31 a rectangular shape, the coil 31 is heated and distributed. By this, Naetzkahin 26
The printing method is 16'/) flu jij,! It stands out as much as Shokuura Min 18. At this time, the coil 37 is designed to give gravity and the surface is exposed, and the support loss 85 is shown in Figure 3 VC.
Lower end 29
A is for the time being limited to the L length that can be tied to the 85 VC.

As a result, the checker bin 26
This prevents him from moving away from the test part 1.
8 and the tip 20 of the checker bin 26 are securely maintained.

The above operations are also performed on the remaining checker bin 26, making it possible to touch the tip 20 of the checker bin to the desired portion 18 to be inspected. Each checker bin 26 has a wrapping line 45 as described above.
connected to the tester via n.

+S of the +ii child circuit is tested. After testing the function of the output circuit, the coil 36 is retracted by applying full force to the coil 36, and the support plate 35 is moved to the right in FIG. As a result, the insertion hole 85& of the support plate 35 is located at the lower end portion 29a of the guide rod 29. At this time, the coil 32 is moved up and down by applying gravity to the coil 32.

This moves the checker bin 26 (I) downward in FIG. 3 and returns to the state shown in FIG.

In the embodiment described, the shape memory platform is 11
111 Heating Elikoil 81, 32, 86° 37
is i: (fi was set back to form a t shape, but ton 1
By applying soil, the coils 81, 32.86.3
Shape memory alloy gold may be used so that 7 is elongated. In that case, a latch is provided across the coil 3 without providing the coil 31, and the specific pressure is set to EIJ) on the coil 32.
The guide rod may be pushed north by heating the checker pin 26 so that it touches the transverse section 18. In this case, by stopping the application of gravity to the coil 32, the probe 28 and the guide rod 29, the coil 32 assumes the transported shape, and the checker bin 26 returns to the shape stored in the insertion hole 22. I did it/
-11 figure, and figure 5 is '4'-+ of Binbo F2]
In Figure 111, the printed wiring board l "6" 2 has a lattice pattern as a JIS part 18, and 4-H4, 1 has a J/J hole or a sword formation. be done. Father, a bin hoard 21t/this checker bin 26 is installed one center to the q4x. Printed wiring board) and iJ on 1'6h? When the desired '+4i, 1,000 times 1 Rakusu f- is brought to the hospital, the checker bin 26 corresponding to the terminal of this secretly read fc 菟子 U path element is operated in the manner described above to melt the circuit. The device is inspected and stopped. According to the present invention, it is not necessary to specify the lattice-like intersections or spiders as the fracture inspection hill portion 18, but it is possible to have an effect by specifying it at a fixed position depending on the type of substrate. Since the desired checker bin can be brought into contact with each object to be inspected one core at a time, there is no need to replace the fixture for each drawing of the object to be inspected, unlike in the past, and work efficiency is therefore the same. Figure 1 shows rice that requires short inspection time.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the prior art, FIG.
The figure is a cross-sectional view of a part of the fixture according to /Fl:@light, m 8 Figure f shows the state in which the carbine 26 is protruding, and Figure 4 is a simplified plan view of the printed wiring boards 1 and 6. FIG. 5 is a plan view of the bin hoard 21. 2 ■... Bin board, 26... Checker bin, 3
1.82.86.87...Coil 41 Figure 4 Figure 5 Procedures Amendment c Method) June 5, 1982'' (1 Patent Act 5'1 Office of the Government, 9) l13 1. Indication of the case Patent application No. 59-46312 2. Name of the invention Printed wiring board inspection device 3. Person making the amendment Relationship to the case Applicant Address Name (504) Sharp Corporation Representative 4, Agent 6, Amendment Subject 8A specification and drawing 7, amendment statement a and engraving of drawings (no change in content). Above 482-

Claims (1)

[Claims] In an inspection device for inspecting the circuit P & performance of an electronic circuit by pressing a checker pin against the inspection part of an electronic circuit installed on a printed wiring board and conducting a careful tracing. Item 11: A shape memory alloy whose shape becomes like a hair when heated at room temperature, which is provided in connection with the checker pin, and a means for applying "it" force for heating to the shape memory alloy. A printed wiring board inspection device characterized by comprising: