KR100730390B1 - Examination apparatus for Printed Circuit Board - Google Patents

Abstract

The present invention eliminates the need for screwing to the jig intermediate plate and introduces a single piece of intermediate plate gap retaining rod having the same length as the entire gap retaining rod, so that assembly time and assembly time can be shortened, and manufacturing cost of parts can be reduced. In addition, the present invention relates to a printed circuit board inspection apparatus having a clean appearance. The printed circuit board inspection apparatus of the present invention configured for this purpose includes a jig top plate, at least one jig intermediate plate, and a jig bottom plate and a jig top plate having jig pin through holes formed at mutually corresponding positions in order to fix the test jig pins in the correct positions. In the printed circuit board inspection apparatus comprising a total gap retaining rod for maintaining the overall vertical gap of the jig lower plate and a middle plate gap retaining rod for maintaining the gap of the jig intermediate plate as predetermined, To form a single cylindrical body having the same length as the overall spacing rod, but the intermediate plate spacing rod forms an annular middle plate fitting groove for each height that matches the spacing between jig middle plates, and maintains the middle plate spacing on the jig intermediate plate. Partly overlaps the middle plate gap retaining rod through hole and the middle plate gap retaining rod through hole through which the rod penetrates Formed side by side to form a middle plate engaging hole consisting of the insertion groove insertion hole for the intermediate plate fitting groove is inserted into the middle plate gap retaining rod is penetrated through the intermediate plate gap retaining rod through hole and then inserted into the intermediate plate fitting groove It is composed of one configuration to be fixed.

Printed Circuit Board, Inspection Equipment, Intermediate Board, Spacing, Retaining Rod, Monolith

Description

Inspection apparatus for printed circuit board

1 is a longitudinal cross-sectional view showing a printed circuit board inspection apparatus according to a conventional embodiment.

Figure 2 is a longitudinal sectional view schematically showing a printed circuit board inspection apparatus according to another embodiment of the prior art.

FIG. 3A FIG. 3B is an enlarged view of “A” and “B” in FIG. 2.

Figure 4 is a longitudinal sectional view schematically showing a printed circuit board inspection apparatus according to an embodiment of the present invention.

Figure 5 is a perspective view showing the structure of the intermediate plate spacing retainer in a printed circuit board inspection apparatus according to the present invention.

Figure 6a and Figure 6b is a partial cross-sectional view of the individual jig intermediate plate for explaining the structure of the intermediate plate retaining bar coupling hole in the printed circuit board inspection apparatus according to the present invention.

Figure 7 is a partial longitudinal cross-sectional view of the printed circuit board inspection apparatus for explaining the structure of the auxiliary jig pin according to the present invention.

[Description of Symbols for Main Parts of Drawing]

300. Inspection device 310. Jig top plate

310a, 310b. Jig pin through hole 310c. Bolt mounting groove

320, 322. Jig intermediate plates 320a, 320c, 322a, 322c. Jigpin Through Hole

320b, 322b. Overall spacing retainer through hole

320d, 322d. Intermediate plate thickness retaining rod fitting

320d-1, 322d-1. Through hole 320d-2, 322d-2. Insertion Groove

330a. 330b. Jigpin Through Hole

330a-1, 332a-1. Protrusions

350, 352. Test jig pins 350a, 352a. Protrusion

380. Overall Spacing Bars 390. Intermediate Plate Spacing Bars

390a. Intermediate plate fitting groove 390b. Nut groove

390c. Large diameter parts 392, 394.Bolts

The present invention relates to a printed circuit board inspection device, and more particularly, to a printed circuit board inspection device that can shorten the total assembly labor and cost of the inspection device by improving the structure of some components of the printed circuit board inspection device. will be.

In general, in a printed circuit board (PCB), a copper foil is laminated on a surface of a plate made of an insulator such as a resin, and a pattern of wiring and etching based on a circuit design is performed on the laminated copper foil to form a wiring figure. do. Since the mounting of various components on the printed circuit board and the configuration of appropriate circuits are directly related to the reliability of the product, whether there are short circuits between traces and bonding points after the mounting of the printed circuit board and the components is completed. In order to inspect, various devices for contacting a jig pin (hereinafter referred to as a "test jig pin") with an element element of a printed circuit board are used to inspect a circuit state.

1 is a longitudinal cross-sectional view showing a printed circuit board inspection apparatus according to a conventional embodiment, a view showing a double-sided printed circuit board inspection apparatus.

As shown in FIG. 1, the overall configuration of a printed circuit board inspection apparatus 100 according to an exemplary embodiment includes upper and lower support plates 110 and 110a and upper and lower support plates 110 and 110a that are installed to face up and down. Auxiliary jig pin 150 having an array of grid pins is installed on each of the opposite surface of the grid pin to be in electrical contact with a plurality of test jig pins 140 to receive or transmit a signal to a number of test points of the printed circuit board 70 is A plurality of upper and lower jig (120, 120a), the upper and lower jig (120, 120a) coupled to the opposing surface of the upper and lower auxiliary jig (120, 120a), respectively, for placing the printed circuit board 70 to be inspected therebetween (130, 130a) ) And upper and lower connectors 160 and 120a, respectively, connected to the rear end of each of the auxiliary jig pins 150 through a wire 162 so that the control unit (not shown) of the device can recognize the correct position. , 160a).

On the other hand, the upper and lower jig (130, 130a) is installed on the opposing surface of the upper and lower auxiliary jig (120, 120a) facing each other between the upper and lower jig (130, 130a) between the coupling holes 132 at equal intervals of the upper and lower -1, 132a-1, the upper and lower jig upper plate (134-1, 134a-1) and the upper and lower parts provided on the upper and lower portions of the coupling member 132, 132a having a plurality of coupling members 132, 132a A plurality of upper and lower jig intermediate plates 134-coupled to the jig lower plates 134-2 and 134a-2 and the coupling holes 132-1 and 132a-1 formed in the coupling members 132 and 132a in the transverse direction. 3, 134a-3), upper and lower jig lower plates (134-2, 134a-2), upper and lower jig intermediate plates (134-3, 134a-3) and upper and lower jig upper plates (134-1, 134a- It is made of a support rod 136 that penetrates 1) and supports the printed circuit board 70 through the top. Reference numerals 122 and 122a in the drawings; 124, 124a, 126, and 126a indicate auxiliary jig pin fixing plates, protective plates, and auxiliary jig pin supporting plates that are respectively installed on the upper and lower jig lower plates 134-2 and 134a-2 to appropriately support the auxiliary jig pins 150. .

FIG. 2 is a longitudinal sectional view schematically showing a printed circuit board inspection apparatus according to another exemplary embodiment. FIG. 3A and FIG. 3B are enlarged views of “A” and “B” of FIG. 2. For convenience, only the portion corresponding to the lower jig of the printed circuit board inspection apparatus illustrated in FIG. 1 is shown. However, when the double-sided printed circuit board is to be examined instead of one side, the upper jig portion having the same structure may be added.

As shown in FIGS. 2 and 3, the apparatus for inspecting a printed circuit board 200 according to another exemplary embodiment may include at least one jig intermediate plate 220 and 222 between the jig upper plate 210 and the jig lower plate 230. A plurality of test jig pins 250 and 252 arranged in this layer and contacting respective inspection points of a printed circuit board (not shown) are supported in place. Such test jig pins are largely vertical jig pins 250. ) And the inclined jig pin 252.

Meanwhile, in order to fix the test jig pins 250 and 252 in place, a plurality of test jig pins 250 and 252 pass through the jig upper plate 210, the jig middle plate 220 and 222, and the jig lower plate 230. The jig pin through holes 210a, 210c; 220a, 220c; 222a, 222c; 230a, 230c are formed. Further, in order to maintain the overall spacing between the jig upper plate 210 and the jig lower plate 230 at a predetermined length, an overall interval maintaining rod having a length equal to the gap is disposed in place between the jig upper plate 210 and the jig lower plate 230. 260 is vertically entered, and through holes 220b and 222b through which the entire interval holding rods 260 pass are formed at corresponding positions of the respective jig intermediate plates 220 and 222.

In addition, nut grooves 260a and 260b are formed at the upper and lower ends of the entire interval maintaining rod 260 to fix the entire interval maintaining rod 260 to the jig upper plate 210 and the jig lower plate 230. The nut grooves 260a and 260b are screw-coupled with the bolts 264 and 262 with the jig upper plate 210 and the jig lower plate 230 interposed therebetween, so that the entire gap retaining rods 260 and the jig upper plate 210 are connected to each other. The jig lower plate 230 is fixed without flow. In the drawings, reference numerals 210b and 230b denote bolt mounting grooves to which bolts 262 and 264 are fixed.

Next, between the jig top plate 210 and the jig intermediate plate 220, between the jig intermediate plates 220 and 222 and the jig intermediate plate (2) to maintain each jig intermediate plate 220, 222 at a predetermined interval. Between the 222 and the jig lower plate 230, a plurality of intermediate plate spacing retaining rods 270, 272, and 274 having a predetermined length are vertically entered. Then, nut grooves 270a and 272a are formed at one side of the intermediate plate gap retaining rods 270 and 272 while bolts 270b and 272b (the jig upper plate 210 and the first jig intermediate plate 220 are formed at the other side). Nut grooves 274a and 274b) are formed in the middle plate spacing retaining rod 274 between the screws. The jig upper plates 210 and the jig middle plates 220 and 222 are interposed therebetween. In the case of coupling with the jig lower plate 230 is screwed by a separate bolt (278, 276)} to fix the jig intermediate plate (220, 222) at a desired interval. Reference numerals 210d and 230d denote bolt mounting grooves on which bolts 276 and 278 are mounted, respectively.

Meanwhile, in order to temporarily hold the test jig pins 250 and 252 in the process of assembling the test jig pins 250 and 252, a four-side span cloth, latex or rubber is provided between the jig lower plate 230 and the last intermediate plate 222. The jig pin gripping member 240 made of cloth or the like is inserted.

However, in the case of the inspection apparatus as shown in FIG. 1, it is not only difficult to manufacture the coupler, but the gap of the coupler is fixed in advance, which causes a lot of difficulties in manufacturing various printed circuit board inspection apparatuses.

On the other hand, in the case of Figures 2 and 3, the problem with the inspection apparatus as shown in Figure 1 can be alleviated somewhat, but this also has a number of intermediate plate spacing retaining rods of the total spacing holding rods having different lengths mutually In addition to the preparation, there was a lot of difficulty in maintaining the same length of the entire gap retaining rod and the intermediate plate gap retaining rod.

Furthermore, since the entire spacing retaining rod and each intermediate plate spacing retaining rod must be fixed by screwing one by one, there is a problem that not only the assembly man-hours are required but also the assembly time is high and it is not good. Since a separate holding member for temporarily holding the jig pin should be installed, there is a problem that the assembling work is not only cumbersome but also the assembly time is long.

Invented to solve all the problems of the prior art as described above of the present invention, it is not necessary to screw to the jig intermediate plate, and assembling maneuver by introducing a single intermediate plate spacing rod having the same length as the entire spacing rod The purpose of the present invention is to provide a printed circuit board inspection apparatus having a neat appearance in addition to reducing assembly costs, and reducing manufacturing costs of components.

The present invention configured to achieve the above object is as follows. That is, in the printed circuit board inspection apparatus of the present invention, a jig upper plate, at least one jig intermediate plate, a jig lower plate, a jig upper plate, and a jig upper plate and a jig in which jig pin through holes are formed at mutually corresponding positions in order to fix the test jig pins in the correct positions In the printed circuit board inspection device comprising a total gap retaining rod for maintaining the overall upper and lower intervals of the lower plate and the intermediate plate gap retaining rod for maintaining the interval of the jig intermediate plate as predetermined, It is formed of a single cylindrical body having the same length as the entire gap retaining rod, and the intermediate plate gap retaining rod forms an annular intermediate plate fitting groove for each height that matches the gap between the jig intermediate plates. Side by side partially overlapped with perforated intermediate plate gap retainer through hole and intermediate plate gap retainer through hole Formed to form an intermediate plate coupling hole consisting of a fitting groove insertion hole in which the intermediate plate fitting groove is inserted so that the intermediate plate gap retaining rod is penetrated through the intermediate plate gap retaining rod through-hole to be fixed to the intermediate plate fitting groove by interference fit. It is characterized by.

In the configuration as described above, the interference fit may be made of a configuration made on both sides in the longitudinal direction and the transverse direction.

In place of the above-described test jig pin is formed a protrusion having a width wider than the diameter of the test jig pin, the jig pin through hole of the jig lower plate may be made of a configuration in which the protrusion is closed portion that can trap the protrusion is formed. have.

On the other hand, the above-mentioned projections may be formed by the process of spreading by expanding the location of the lower portion of the test jig pin by hitting.

The auxiliary jig pin may be further provided to elastically support the test jig pin.

Hereinafter, a printed circuit board inspection apparatus according to a preferred embodiment of the present invention will be described in detail.

4 is a longitudinal sectional view schematically showing a printed circuit board inspection apparatus according to an embodiment of the present invention. For convenience, the printed circuit board inspection apparatus shown in FIG. 1 shows only a portion corresponding to the lower jig. However, if the double-sided printed circuit board is to be examined instead of one side, the upper jig portion of the same structure may be added.

As shown in FIG. 4, in the printed circuit board inspection apparatus 300 according to an exemplary embodiment, at least one jig intermediate plate 320 and 322 is disposed between the jig upper plate 310 and the jig lower plate 330. Arranged to support a plurality of test jig pins 350 and 352 in contact with each test point of the printed circuit board (not shown) in place, these test jig pins are largely vertical jig pin 350 and It may be made of an inclined jig pin 352.

Meanwhile, a plurality of test jig pins 350 and 352 penetrate the jig upper plate 310, the jig intermediate plate 320 and 322, and the jig lower plate 330 to fix the test jig pins 350 and 352 in place. The jig pin through holes 310a, 310b; 320a, 320c; 322a, 322c; 330a, 330b are formed. Further, in order to maintain the overall spacing between the jig upper plate 310 and the jig lower plate 330 at a predetermined length, an overall interval maintaining rod having a length equal to the interval is disposed in place between the jig upper plate 310 and the jig lower plate 330. 380 is vertically entered, and for this purpose, at each corresponding position of each of the jig intermediate plates 320 and 322, total interval maintaining rod through holes 320b and 322b through which the entire interval maintaining rod 380 is formed are formed. . But. In the printed circuit board inspection apparatus 300 of the present invention, unlike the apparatus of FIGS. 2 and 3, a bolt and a nut for fixing the entire interval maintaining rod 380 to the jig upper plate 310 and the jig lower plate 330 are adopted. It is not.

Next, in the present invention, in order to maintain each jig intermediate plate 320, 322 at a predetermined interval, the intermediate plate gap retaining rod 390 having the same length as the entire gap retaining rod 380 but having a single cylindrical body. 5 is a perspective view showing the structure of the intermediate plate gap retaining bar in the printed circuit board inspection apparatus according to the present invention, Figure 6a and 6b is coupled to the intermediate plate gap retaining rod in the printed circuit board inspection apparatus according to the present invention Partial cross-sectional view of individual jig intermediate plates to explain the structure of the ball.

First, as shown in Figure 5, the intermediate plate spacing retaining rod 390 of the present invention is made of a single metal cylinder, the middle of the jig between the upper plate 310 and the jig intermediate plate 320, jig intermediate plate Annular intermediate plate fitting grooves fitted to the jig intermediate plates 320 and 322 at intervals to maintain the gap between the fields 320 and 322 and between the jig intermediate plate 322 and the jig lower plate 330 at a predetermined length. 390a is formed.

Therefore, the diameter sd of the intermediate plate fitting groove 390a described above is, of course, smaller than the diameter ld of the outer portion of the intermediate plate spacing retaining rod 390 (hereinafter referred to as the 'large diameter portion') 390c. The upper and lower widths may be formed in a range having a value equal to or slightly smaller than the thickness of the jig intermediate plates 320 and 322 so that the upper and lower widths can be fixed to the jig intermediate plates 320 and 322. There will be. The jig top plate 310 and the jig lower plate 330 are fixed to the jig upper plate 310 and the jig lower plate 330 at the top and bottom of the middle plate gap maintaining rod 390 without flow. The nut grooves 390b screwed with the bolts 394 and 392 are respectively formed with the gaps interposed therebetween. In FIG. 4, reference numerals 310c and 330c denote bolt mounting grooves in which bolts 394 and 392 are seated, respectively.

On the other hand, each jig intermediate plate (320, 322) for coupling with the intermediate plate spacing bar 390 is pressed after the intermediate plate spacing bar (390) as shown in Figures 6a and 6b Coupling holes 320d and 322d are formed, and the coupling holes 320d and 322d are large diameter portions 390c of the middle plate spacing bar 390 so that the middle plate spacing bar 390 can be penetrated again. The through hole 320d-1 and 322d-1 having a diameter equal to or slightly larger than the diameter ld of the second through hole 320d-1 and 322d-1 and a part of the intermediate plate next to the through hole 320d-1 and 322d-1. Insertion groove insertion holes 320d-2 and 322d- having a diameter that is equal to or slightly larger than the diameter sd of the intermediate plate fitting groove 390a of the spacer 390a, into which the intermediate plate fitting groove 390a is inserted. 2) consists of.

Therefore, the width of the point where the through holes 320d-1 and 322d-1 and the fitting groove insertion holes 320d-2 and 322d-2 intersect is the diameter of the fitting groove insertion holes 320d-2 and 322d-2 ( Slightly smaller than the sd) or the same range should be determined in the insertion groove insertion hole (320d-2, 322d-2) will be interposed between the intermediate plate fitting groove (390a) of the intermediate plate spacing retaining rod 390. As a result, in the printed circuit board inspection apparatus 300 of the present invention, the intermediate plate spacing retaining rod 390 penetrates through the through holes 320d-1 and 322d-1 of the jig intermediate plates 320 and 322, respectively. Since the intermediate plate fitting groove 390a of the middle plate fitting groove 390a can be easily inserted into the insertion groove insertion holes 320d-2 and 322d-2, the gap between the jig intermediate plates 320 and 322 can be maintained without screwing. Assembly of the printed circuit board inspection apparatus 300 becomes much more convenient.

The present invention also crimps a predetermined portion of the lower portion of the test jig pins 350 and 352 so as not to use a jig pin holding member for temporarily holding the test jig pins 350 and 352 during the assembly process. By spreading the part by spreading and spreading the part by blow, thereby forming a part 350a and 352a having a width wider than the diameter of other parts of the test jig pins 350 and 352; The protruding portions 350a and 352a allow the test jig pins 350 and 352 to be closed inside the jig pin through holes 330a and 330b formed in the jig lower plate 330.

In more detail, the inlet and outlet diameters of the jig pin through holes 330a and 330b are larger than the normal diameters of the test jig pins 350 and 352, whereas the widths of the protrusions 350a and 352a are described. It is formed smaller than, and in addition to the projections having a diameter larger than the width of the projections (350a, 352a) in the middle of the jig pin through-holes (330a, 330b) to trap the projections (350a, 352a) in the jig lower plate 330 330a-1 and 330b-1. Then, the closing of the protrusions 352a and 350a of the test jig pins 350 and 352 to the protrusions 330a-1 and 330b-1 may be performed through the upper plate 331 of the jig lower plate 330. The lower plate 332 of the lower plate 330 of the jig lower plate 330 is coupled to the upper plate by the bolts 392 in a state in which the protrusions 350a and 352a are caught by the jig pin through holes 330a and 330b. By combining with 331.

7 is a partial longitudinal cross-sectional view of the PCB inspection apparatus for explaining the structure of the auxiliary jig pin according to the present invention.

As shown in FIG. 7, in the printed circuit board inspection apparatus 300 according to the present invention, the test jig pins 420 for electrically connecting the test jig pins 350 and 352 and the wire 410 are improved to improve the test jig pins. Electrical contact force between 350 and 352 and the auxiliary jig pin 420 is improved. That is, the printed circuit board inspection apparatus 300 according to the present invention is installed on the rear surface of the auxiliary jig pin fixing plate 402 in which the protection plate 404 is installed to support the bottom of the auxiliary jig pin 420, but the wire 410 is penetrated. Electrical contact force between the test jig pins 350 and 352 and the auxiliary jig pin 420 by improving the configuration of the auxiliary jig pin support plate 406 and the auxiliary jig pin 420 having the wire insertion hole 406-1 formed therein. Is improving. At this time, the auxiliary jig pin 420 is seated in the auxiliary jig pin head hole (404-1) formed in the protective plate 404, the pin head that one end of the test jig pin (350, 352) to the outer surface of the electrical contact 422, the coupling is formed to extend a predetermined length in the center of the lower surface of the pin head 422 but the outer diameter of the auxiliary jig pin coupling hole 402-1 formed in the auxiliary jig pin protective plate 402 smaller than the inner diameter One end is electrically coupled and fixed to the end 404 and the coupling end 404 and the other end is electrically connected to the wire 410, but the pin head 422 is elastically supported to support the pin head 422 and the test jig pin ( Compression spring 426 is configured to facilitate the contact of the 350, 352.

In the configuration of the auxiliary jig pin 420 as described above, the thread is formed on the outer circumferential surface of the coupling end 424 to further strengthen the coupling force when the coupling end 424 and the compression spring 426 are coupled to prevent separation. The outer diameter of the coupling end 424 is formed to have a diameter corresponding to the inner diameter of the compression spring 426, and is tightly coupled when the compression spring 426 is coupled to the coupling end 424. As such, when the compression spring 426 is coupled to the coupling end 424 having a thread formed on the outer circumferential surface, the coupling force between the coupling end 424 and the compression spring 426 is enhanced due to the engagement and tight coupling by the thread. The separation of 424 and compression spring 426 is prevented.

In the above-described configuration, the compression spring 424 may be configured to have a portion of the wire 410 in the form of a coil, and the compression spring 424 may be configured to connect a spring formed in the form of a coil to the other end of the wire. have. Furthermore, in addition to the configuration described above, the auxiliary jig pin 420 according to the present invention has a pin head 422 to further strengthen the electrical contact force between the test jig pins 350 and 352 and the upper surface of the pin head 422. Unevenness (422a) is further formed on the upper surface of the (). At this time, the unevenness (422a) formed on the upper surface of the pin head 422 is formed regularly or irregularly.

As described above, a test jig pin for making electrical contact with the upper surface of the pin head 422 by forming irregularities 422a on the upper surface of the pin head 422 of the auxiliary jig pin 420 (regularly or irregularly). Since the pin head 422 is elastically supported by the compression spring 426, the jig pin for the test is held because the pin head 422 is in contact with the uneven surface 422a of the upper surface of the pin head 422. The contact force between the 420 and the pin head 422 is further enhanced.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

As described above, according to the printed circuit board inspection apparatus of the present invention, by forming the intermediate plate gap retaining rod as a single unit, the length of the intermediate gap retaining rod can be matched. You can get it right.

Furthermore, by forming the intermediate plate retaining rod as a single body, not only can the bolt and nut processing cost be reduced by using a large number of them, but also the time required for assembling the inspection apparatus can be significantly shortened because the bolt is not assembled. It can provide a beautiful appearance.

In addition, by forming a protrusion on the test jig pin and thereby the test jig pin is temporarily held in the assembly process, there is no need to use a separate holding member for this, thereby reducing costs and convenience of work.

Claims (5)

Jig upper plate, at least one jig intermediate plate and jig lower plate and jig upper plate and jig upper plate and jig lower plate which have a jig pin through hole formed at mutually corresponding positions to fix the test jig pins in a fixed position are kept constant. In the printed circuit board inspection apparatus comprising an intermediate plate gap retaining rod for maintaining the interval between the entire interval holding rod and the jig intermediate plate as predetermined, The intermediate plate spacing retaining rod is formed of a single cylindrical body having the same length as the entire spacing retaining rod, and the intermediate plate spacing retaining rod forms an annular intermediate plate fitting groove for each height corresponding to the spacing between the jig intermediate plates. , The jig intermediate plate is formed in parallel with the intermediate plate gap retaining rod through hole through which the intermediate plate gap retaining rod penetrates and the intermediate plate gap retaining rod through hole, and the intermediate plate including the insertion groove insertion hole through which the intermediate plate fitting groove is interposed. Forming a joining hole, Printed circuit board inspection apparatus characterized in that the intermediate plate spacing retaining rod is fixed to the intermediate plate fitting groove by the interference fit after passing through the intermediate plate spacing retaining rod through hole. 2. The printed circuit board inspection apparatus according to claim 1, wherein the interference fit is performed at both sides in the longitudinal direction and the transverse direction. According to claim 2, Protruding portion having a width wider than the diameter of the test jig pin is formed in place of the lower portion of the test jig pin, Printed circuit board inspection apparatus, characterized in that the jig pin through hole of the jig lower plate is formed with a projection closing portion for trapping the projection. 4. The printed circuit board inspection apparatus according to claim 3, wherein the protrusion is formed by a process of spreading and spreading a lower portion of the test jig pin by a blow. The apparatus according to any one of claims 1 to 4, further comprising an auxiliary jig pin for elastically supporting the test jig pin.

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