JPH05307058A - Inspection jig for printed circuit board - Google Patents

Abstract

PURPOSE:To provide an inspecting jig for a printed circuit board which can well deal with thinning of the needle of probe, can prevent it from damage, is easy to connect with an inspection apparatus, and is capable of reusing the probes and contact pins. CONSTITUTION:An inspection jig concerned is composed of contact pins 3 mounted slidably on a guide plate 8 and probes 1 inserted in a pin board 88. Each probe 1 has a needle 2 installed capably of advancing and retreating resiliently. The needles 2 are put in contact with the heads of the contact pins 3, and a terminal board 4 is furnished on the pin board 88, and terminal pin 45 in connection with a lead wire 15 is installed in pin hole provided in the terminal board 4. The terminal pin 45 is electrically connected with the probe terminal 12, and the tip of the contact pin 3 is brought into contact with a wiring circuit 71, and thus the electric continuity is inspected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for a printed wiring board, in particular, a structure around a probe that exhibits an excellent effect on the inspection of a high-density wiring circuit, and electrical connection and disconnection with an inspection device. The present invention relates to a structure around a terminal board that facilitates and.

[0002]

2. Description of the Related Art As a method of inspecting a wiring circuit on a printed wiring board for the presence or absence of electrical continuity and its apparatus, various types have been proposed (for example, Japanese Patent Publication No.
No. 44035, JP-A No. 56-11060). As a conventionally used inspection jig for a printed wiring board, as shown in FIGS. 15 and 16, a stylus 92 of a probe 9 is brought into contact with a wiring circuit 75 of the printed wiring board 7. Is used to inspect for electrical continuity.

The inspection jig comprises a guide plate 8 for preventing rattling of the tip of the probe, a pin board 88 for holding the probe 9, and a probe 9 mounted by penetrating both. As shown in FIG. 16, the probe 9 has a pipe-shaped socket 91 and a stylus 92.
The socket 91 is inserted and fixed in the through hole 881 of the pin board 88. On the other hand, the stylus 92 is inserted into the guide hole 81 of the guide plate 8 so as to be movable back and forth. The stylus 92 has a plunger 920 on its upper part. The plunger 920 is mounted in the inner cavity of the tube 25 so as to be movable back and forth via a spring spring (not shown).

The upper end of the probe 9 is electrically connected to an inspection device for detecting electrical continuity via a lead wire. In this case, the connection between the upper end of the probe and the lead wire is often soldered. The guide plate 8 has a recess 8 for disposing the lower end of the socket 91.
Have two. Further, the probe 9 is provided at a position corresponding to the wiring circuit 75 of the printed wiring board 7 as the inspection object. Further, the guide plate 8 and the pin board 88 are integrally fixed.

When inspecting the electrical continuity of the wiring circuit, the guide plate 8 is placed from above and below the printed wiring board 7.
Also, the pin board 88 is lowered and raised, and the stylus 92 of the probe 9 is brought into contact with the stylus pad (hereinafter omitted) of the wiring circuit 75. At this time, when the wiring circuit 75 is not broken or short-circuited, normal electrical conduction is obtained. As a result, the quality of each wiring circuit 75 can be determined.

Further, in the above, the tip 921 of the stylus 92 is used.
When contacting the wiring circuit 75, the stylus 92 retracts toward the socket 91 side along the guide hole 81 of the guide plate 8,
The plunger 920 penetrates into the socket 91.
This is to protect the tip 921 of the stylus 92.
In FIG. 15, reference numerals 87 and 886 are insertion holes for knock pins 891, and 871 and 885 are positioning pins 89.
2 insertion holes.

[0007]

[Problems to be Solved] However, the conventional inspection jigs described above have the following problems. That is, in recent years, the density of wiring circuits in printed wiring boards has increased, and the pitch of the pads at the ends of the wiring circuits has become narrower.
For example, this pitch was conventionally about 0.65 mm, but in a high-density wiring circuit it is as narrow as 0.3 mm.

Therefore, in order to deal with this, the probe 9
Since it is necessary to narrow the array pitch of, it is necessary to reduce the size (diameter) of the probe itself. Also in the probe 9 currently used, the outer diameter of the socket 91 is about 1 mm, and the diameter of the probe 92 is as small as 0.5 mm.

In the conventional inspection jig, the tip 921 of the stylus 92 is directly connected to the wiring circuit 75 in the inspection.
Abutting against. Further, at the time of contact, the stylus 92 slides in the guide hole 81 of the guide plate 8 and retracts as described above. Then, after the inspection, the stylus 92 is made to project again to its original position by the spring spring provided in the socket 91. Therefore, the stylus 92 slides in the guide hole 81 at each inspection.

Therefore, the stylus 92 is easily worn. Further, if the diameter of the guide hole 81 is increased to prevent this wear, the clearance between the stylus 92 and the stylus 92 becomes large, and the tip 921 of the stylus 92 may rattle, resulting in defective inspection. Further, the stylus 92 is inserted into a socket 91 fixed to the pin board 88. Therefore, the socket 91, the stylus 92, and the guide hole 81 must have the same axis. Therefore, in order to smoothly slide the small-diameter stylus 92, the guide hole 81 needs to be drilled with high dimensional accuracy so that the shaft cores coincide with each other.

Further, the stylus 92 slides coaxially in the socket 91 and the guide hole 81, and the tip 921 of the stylus 92 directly contacts the wiring circuit 75. It is easily damaged. As described above, in the conventional inspection jig, as the wiring circuit becomes higher in density, there are problems particularly in the thinning and damage of the probe stylus 92 of the probe, the drilling accuracy of the guide hole 81, and the like.

Further, the upper end of the probe is electrically connected to the inspection device via the lead wire, and the inspection circuit is electrically closed. In the past, the upper end of a large number of probes of several tens to several hundreds and the lead wire are connected by soldering.

On the other hand, since the array pattern of the probes changes every time the printed wiring board changes, the so-called detection section around the probes needs to be replaced for each printed wiring board. Therefore, at the time of this replacement, a large number of the solders between the probe and the lead wire must be removed,
The mounting work requires a large number of man-hours. Also, many lead wires and probes must be soldered again according to the new inspection circuit. Further, since the probe is a small diameter part as described above, it is an expensive precision part. Therefore, it is costly to use a new one every time the wiring circuit of the device under test changes. for that reason,
It is also longed for the probe to be reusable.

In view of the above conventional problems, the present invention can cope with the thinning of the probe stylus and the prevention of damage, the electric connection with the lead wire is easy, and the probe can be reused. It is intended to provide the inspection jig.

[0015]

The present invention is an inspection jig for inspecting a wiring circuit in a printed wiring board according to the presence or absence of electrical continuity, the inspection jig including a guide plate, a pin board, and the wiring circuit. The probe includes a contact pin for making contact with the probe and a probe having a stylus for making contact with the contact pin. The contact pin is attached to the guide plate so as to be able to move back and forth. A terminal board is provided on the pin board, a pin hole is provided in the terminal board, and a lead wire is connected to one end in the pin hole. According to another aspect of the present invention, there is provided an inspection jig for a printed wiring board, characterized in that the pins are arranged and the terminal pins and the probe terminals of the probe are electrically connected to each other at positions facing each other.

The first point that is most noticeable in the present invention is that the probe of the above-mentioned conventional example is divided into two sets, so to speak,
The contact pin and the probe are configured, and the contact pin is brought into contact with the wiring circuit, while the probe stylus is brought into contact with the contact pin.

That is, contact pins are attached to a guide plate facing the printed wiring board so as to be able to move forward and backward, and a probe is fixed to the pin board facing the guide plate. And
The probe has a stylus built therein so that it can move forward and backward elastically.
Thus, as a means for incorporating the stylus, there is a means for elastically holding the stylus in the tube and mounting these in the socket (see FIGS. 4 and 5). There is also a means for elastically holding the probe by inserting a direct contact needle into the probe. There is a spring spring as the elastically holding means.

Further, the contact pin is mounted in the guide hole of the guide plate so as to be able to move back and forth. The contact pin has a tip that abuts on the wiring circuit, and an abutting portion that abuts the stylus on the opposite side. The abutting portion preferably has a head portion having a diameter larger than that of the main body of the contact pin. Further, it is preferable to provide a curved surface concave portion at the contact portion to ensure contact of the stylus (see FIG. 6). In addition, in the inspection jig of the present invention, the guide pin and the pin board are provided with the contact pins and the probe having the above-mentioned configuration according to the present invention, and the above-mentioned conventional method is used to inspect a portion where the wiring circuit of the printed wiring board is not high density. It is also possible to install a probe pin having a relatively large diameter similar to the example.

Another point to be noted in the present invention is that, as a means for electrically connecting with a tester, a terminal pin having a lead wire connected to one end is arranged in the pin hole of the terminal board, and the terminal is connected to the terminal board. That is, the pins are electrically connected to the probe terminals. The terminal board is provided with pin holes, but the pin holes are arranged in the same manner as the probes, so that the probes and the pin holes are in a facing relationship.

Also, a terminal pin is inserted into each pin hole, and a lead wire is connected to one end of the terminal pin.
The tip of the lead wire is connected to the inspection device. The other end of the terminal pin is arranged to face the probe terminal of the probe. The other end of the terminal pin and the opposing probe terminal are attached, for example, with their ends protruding from the attachment surface, and have a structure in which mutual electrical contact is easy. As a method for electrically connecting the opposing terminal pins and the probe terminals, for example, there is a method in which all the terminal pins arranged on the terminal board and all the probe terminals are collectively pressed and brought into direct contact with each other. In this case, a pressure conductive rubber may be interposed between them.

[0021]

In the inspection jig of the present invention, contact pins are provided on the guide plate and probes are provided on the pin board.
The contact pin is brought into contact with the wiring circuit of the printed wiring board, and the stylus of the probe is brought into contact with the contact pin. That is, in the present invention, a portion (contact pin) that slides in the guide hole and comes into contact with the wiring circuit and a probe that is a detection end of electrical conduction are divided into two parts. Therefore, the contact pin advance / retreat and the probe stylus advance / retreat are independent.

Therefore, it is not necessary to accurately match the three axes of the probe fixed to the pin board, the stylus inserted therein, and the guide hole of the guide plate through which the contact pin advances and retracts. . Therefore, it is sufficient that the axial center of the guide hole is drilled so as to be aligned with the wiring circuit of the printed wiring board, which does not require high precision as in the conventional case and is easy to drill. Further, since it is sufficient that only the contact pin can be smoothly slid in the guide hole, it is possible to provide the guide hole with a small diameter and reduce the rattling of the contact pin. Also, when the contact pin wears,
It can be replaced easily and at low cost.

Further, since the probe is not directly brought into contact with the wiring circuit, it is not damaged as in the conventional case.
Moreover, the contact pin slides in the guide hole by directly contacting the wiring circuit, but unlike the conventional probe stylus, it does not move back and forth linearly in both the guide hole and the socket of the probe. It is not damaged by misalignment.

Further, as described above, since the contact pin and the probe are separately configured to prevent the forward and backward movement of both of them during the inspection, it is possible to reduce the diameter of both. Therefore, it is easy to inspect high-density wiring circuits. Moreover, the probe is elastically mounted in a socket having a small inner diameter of 0.1 to 0.3 mm so as to be able to move forward and backward. Therefore, although it is an expensive precision part, it is not damaged as described above, so the cost of the inspection jig is also low.

Further, in the inspection jig of the present invention, it is easy to electrically connect the inspection device and the so-called detection portion around the probe. That is, according to the present invention, a terminal board having the same arrangement of terminal pins as the probe terminals is pressed against the pin board to enable electrical connection with all probe terminals at once. Therefore, the operation is extremely easy as compared with the method of establishing conduction for each individual terminal.

Further, it is extremely easy to connect one end of the terminal pin to the terminal structure and to connect the lead wire in advance. After inserting the terminal pin into the pin hole, the other end of the lead wire is used as an inspection device. Connecting is likewise extremely easy. Further, it is extremely easy to establish electrical conduction between the probe terminal and the terminal pin that are in a facing relationship by pressing the two.

Further, in the present invention, the probe is not soldered to the lead wire as in the conventional case, but is only electrically connected to the terminal pin as described above.
Therefore, expensive probes and contact pins, which are precision parts, can be easily removed from the pin board and guide plate and can be reused. Therefore, according to the present invention,
We provide a test jig for printed wiring boards that can be used to reduce the diameter of the probe stylus and prevent damage, and that can be easily connected to and removed from the tester and that the probe and contact pins can be reused. be able to.

[0028]

【Example】

Example 1 An inspection jig for a printed wiring board according to an example of the present invention will be described with reference to FIGS. In addition, the whole structure is divided into a detection part that contacts a contact with a printed wiring board and transmits a signal to the other end of the probe, and a relay part that connects a probe terminal to a tester via a lead wire. Separate each.

As shown in FIGS. 1 to 3, the detection portion of the inspection jig of this example includes a guide plate 8, a pin board 88, a contact pin 3 for contacting the wiring circuit 71, and the contact pin 3. The probe 1 has a built-in stylus 2 for making contact with the probe 1. Further, the contact pin 3 is mounted on the guide plate 8 so as to be movable back and forth, and the stylus 2 is built in the socket 11 of the probe 1 so as to be elastically movable forward and backward. As will be described later in detail, a pressure conductive rubber plate 5 is interposed between the probe terminal 12 of the probe 1 and the terminal pin 45 in the terminal board 4 to electrically connect the two ( (Figure 9).

The wiring circuits 71 are arranged in high density on the printed wiring board 7. The guide plate 8 and the pin board 88 are detachably and integrally coupled by a knock pin 891 as in the conventional case. As shown in FIGS. 1 to 3, 7, and 8, the guide plate 8 has a large number of guide holes 8 for mounting the contact pins 3 so that the contact pins 3 can move forward and backward.
5 and an opening groove 86. In addition, the pin board 88,
As shown in FIGS. 2 and 3, there is a through hole 882 for inserting and fixing the socket 11 of the probe 1.

As shown in FIGS. 2, 3 and 6, the contact pin 3 has a tip 31 for contacting the wiring circuit 71 and a head for contacting the stylus 2. It has a part 32. In addition, the head 32 has a curved concave portion 321.
(FIG. 6). As shown in FIGS. 2 to 5, the probe 1 is composed of a socket 11 and a stylus 2 which is inserted into the socket 11 so as to be movable back and forth. As shown in FIG. 4, the socket 11 is a hollow pipe and has a flange 11 on the insertion side of the stylus 2.
Has 0. Further, the lead wire 15 connected to the inspection device 18 (FIG. 1) is provided on the upper portion.

On the other hand, the stylus 2 is mounted in the tube 25 so as to be movable back and forth, as shown in FIGS. That is, as shown in FIG. 5, the stylus 2 has a guide column 22 having substantially the same diameter as that of the stylus 2, and a thin connecting portion 21 between the two. Then, the spring 25 is first put in the tube 25, and then the stylus 2 is inserted. Then, the tube 25 is caulked at the outer side of the connecting portion 21 of the stylus to form the caulked portion 251. .

As a result, the stylus 2 is elastically mounted in the tube 25 by the spring spring 23 so as to be able to move forward and backward. The reference numeral 252 indicates the tube 25.
Is a caulking portion provided at the upper end of the spring for contacting the upper end of the spring spring 23. Then, the stylus 2 configured as described above is inserted into the hollow portion 111 of the socket 11 as shown in FIG. At this time, the upper end of the tube 25 holding the stylus 2 has the caulked portion 113 of the socket 11.
Abut. Further, the probe 1 configured as described above
1 to 3, is inserted into the through hole 882 of the pin board 88 and is detachably fixed. Others,
This is similar to the conventional example.

Next, the function and effect of the detector will be described.
That is, when inspecting the quality of the wiring circuit 71 on the printed wiring board 7 by electrical conduction, as shown in FIGS. 1 to 3, the guide plate 8 and the pin board 88 are approached to each wiring circuit 71 from above and below. Then, the guide plate 8 faces the printed wiring board 7.

At this time, before the contact between the two, the contact pin 3 is in a state of protruding from the guide plate 8 as shown in FIG. Also, the head 3 of the contact pin 3
The tip 21 of the stylus 2 of the probe 1 is in contact with 2. Then, the guide plate 8 contacts the printed wiring board 7,
When the tip 31 of the contact pin 3 comes into contact with the wiring circuit 71, the contact pin 3 slides up in the guide hole 85. Then, as shown in FIG. 3, the tip 31 of the contact pin is located at substantially the same position as the lower surface of the guide plate 8.

Therefore, the head 32 of the contact pin 3 is
The stylus 2 is pressed toward the probe 1. Therefore, the stylus 2 enters the tube 25 against the biasing force of the spring spring 23 (FIG. 5). Thus, after the tip 31 of the contact pin 3 comes into contact with the wiring circuit 71, the probe 1, the stylus 2, and the stylus 2, via the lead wire 15.
A current is passed through the contact pin 3 to judge the quality of the wiring circuit 71 as in the conventional case (FIG. 1).

After the inspection, the guide plate 8 and the like are moved away from the printed wiring board 7. Therefore, the contact pin 3 projects as shown in FIG. 2 due to the attachment of the spring spring 23 of the stylus 2. As described above, in the inspection jig of this example, the contact pin 3 is mounted on the guide plate 8 so as to be movable back and forth, and the probe 1 is fixed to the pin board 88 and the stylus 2 is movable so as to move back and forth inside the probe 1. I am wearing it.

Therefore, the movement of the contact pin 3 and the movement of the stylus are independent of each other. Therefore, as in the prior art, the three axes of the probe 1 fixed to the pin board 88, the stylus 2 inserted therein, and the guide hole 85 of the guide plate through which the stylus advances and retracts are matched with high accuracy. You don't have to let me. That is, in this example, even if the axial center of the contact pin 3 and the axial center of the stylus 2 are misaligned, there is no problem as long as they are in contact with each other (FIGS. 2 and 3).

Therefore, the guide hole 85 may be formed so as to match the wiring circuit of the printed wiring board. Therefore, high precision is not required for the drilling accuracy with respect to the shaft center of the guide hole 85 and the hole of the pin board 88, and the drilling is easy. Further, since the guide hole 85 only needs to be able to smoothly slide the contact pin 3, it can be provided with a small diameter and is free from rattling.

Further, since the probe 1 does not directly contact the stylus 2 with the wiring circuit 71, it is not damaged as in the conventional case. Further, the contact pin 3 directly abuts on the wiring circuit 71 and slides in the guide hole 85. However, like the stylus of the conventional probe, the contact pin 3 must be linearly advanced and retracted both in the guide hole 85 and the probe socket. There is no. Therefore, there is no damage due to axial misalignment between the two.

Further, since the contact pin 3 and the probe 1 are separately configured so as not to cause an unreasonable increase / decrease in the both during the inspection, both of them can be thinned. In this example, the diameter of the contact pin 3 is 0.27 mm, and the outer diameter of the socket of the probe 1 is 0.45 mm.
mm, inner diameter is 0.27 mm, outer diameter of stylus 2 is 0.15 m
m. In addition, in the contact pin 3 of this example,
Since the curved portion 321 is provided on the head 32, the head 3
The tip 20 of the stylus 2 can be reliably brought into contact with the needle 2.

Next, the relay section of this embodiment will be described with reference to FIG. First, in the relay section of this example, the terminal pin 45
A pressure conductive rubber plate 5 is interposed between the probe terminal 12 and the probe terminal 12. That is, as shown in FIG. 9, the probe 1 is removably inserted in the pin board 88, and the probe terminal 12 thereof is arranged so that the head 121 thereof projects from the upper surface 888 of the pin board. Further, the terminal board 4 is arranged on the upper part of the pin board, and the terminal board 4 is provided with a pin hole 41. In the pin hole 41, the lead wire 1
The column-shaped terminal pin 45 connected to 5 is arranged.

A pressure conductive rubber plate 5 is provided between the pin board 88 and the terminal board 4. The pin hole 41
Have the same arrangement as the probe terminals 12 and are arranged so as to have a one-to-one facing relationship with the probe terminals 12. The pin hole 41 of the terminal board 4 includes a lower hole 413 and an upper hole 412. The lower hole 413 has a cross section that is slightly larger than the cross section of the terminal pin 45, and its length is
The shape is slightly shorter than the length of 5. On the other hand, the upper pore 4
The reference numeral 12 has a cross section sufficient for inserting the lead wire and is of a size such that the terminal pin 45 cannot be inserted therein.

That is, the cross section of the terminal pin 45 is the pin hole 4
1 is slightly smaller than the cross section of the lower hole 413, so that it can be freely inserted into and removed from the pin hole 41, while its length is 4 mm.
1 has a size and shape such that the terminal pin lower portion 452 is slightly exposed when inserted deeply into the pin hole. One end 151 of the lead wire 15 is connected to one end of the terminal pin 45, and the other end 152 of the lead wire 15 is inserted into the upper pore 412 of the pin hole 41 and connected to the terminal 181 of the inspection device 18. As the pressure conductive rubber plate 5, pressure conductive rubber made of silicon rubber containing copper powder was used.

Next, the function and effect of the relay section thus constructed will be described. As shown in FIG. 9, the terminal board 4
When is pressed, the lower part 452 of the terminal pin and the head part 121 of the probe terminal, which face each other, strongly press the pressing conductive rubber plate 5,
A concave portion 51 is formed in the pressure conductive rubber plate 5, and an electric conduction state is generated between them.

On the other hand, in the other non-pressurized portion 53 which is not pressed by the probe terminal and the terminal pin, the electrically insulated state is maintained.

In this way, only all the probe terminals 12 and the terminal pins 45 facing each other are electrically connected all at once. Therefore, as compared with the conventional method of connecting and disconnecting the probe terminals and the lead wires one by one with soldering, the work of connecting to or disconnecting from the inspection device 18 becomes extremely easy. Further, when the circuit pattern of the inspection object is changed, the probe 1 and the contact pin 3 can be removed by removing the pressure conductive rubber plate 5 and the terminal board 4 from the pin board 88.
Can be easily removed, and these can be easily reused.

As described above, according to the present embodiment, even for a high-density wiring circuit, it is possible to cope with the thinning of the probe stylus and the prevention of damage, the guide hole can be easily drilled, and the inspection can be performed. Provided is a jig for inspecting a printed wiring board, in which the probe and the contact pin can be reused easily and electrically connected to and detached from the device.

Example 2 This example is another example of Example 1 in which a pressure conductive rubber plate is not used in the relay portion. That is, as shown in FIG. 10, as in the first embodiment, the probe 1 is inserted into the pin board 88, and the probe terminal 12 thereof has the head 12 thereof.
1 is arranged so as to project from the upper surface of the pinboard. Further, the terminal board 4 is arranged on the upper portion of the pin board 88, and the pin holes 41 are formed in the terminal board 4 and the probe terminals 12 and 1.
They are provided in a one-to-one facing relationship. A terminal pin 46 having the lead wire 15 connected to one end is arranged in the pin hole 41.

The terminal board 4 in this embodiment is made of a material having some elasticity and electrical insulation, such as an elastic rubber material. In addition, as the terminal pin 46 in this example, a spherical mass formed at the tip of the enamel wire when arc-cut is plated with gold is used. That is, the terminal pin 46 of this example is spherical.

When the terminal pin 46 is inserted into the pin hole 41 of the terminal board 4, the lower end portion of the terminal pin 46 has the pin hole 41.
The pin hole 4
One lower hole 413 is formed. Further, in this example, the terminal board 4 is directly pressed against the pin board 88 without interposing the pressure conductive rubber plate, so that the probe terminal 12 and the terminal pin 46 are mechanically brought into contact with each other, and the probe board 12 and the terminal pin 46 are electrically connected. To get the proper continuity.

In this case, when the enamel wire is arc-cut, the spherical mass generated at the tip is not completely uniform, so that the terminal board 4 is made of a material having elasticity. That is, when the terminal board 41 is pressed against the pin board, the elasticity of the terminal board ensures the contact pressure between all the terminal pins 46 and all the probe terminals 12 facing each other.
It is configured to ensure electrical continuity. Further, the enameled wire as a material is inexpensive, and a large amount of the terminal pins 46 can be manufactured at a low cost by a method of arc-cutting and gold-plating the wire, and the pressure conductive rubber plate 5 is not used. It is also inexpensive.

Others are the same as those in the first embodiment. In addition,
In the above-described first embodiment, the structure of the purob is such that the tube 25 is inserted into the hollow 111 of the socket 11, but the structure of the probe may be a structure without the socket 11. In this case, the tube 25 is directly inserted into the through hole 882 of the pin board 88 in a loosely fitted state.

Embodiment 3 In this embodiment, the structure of the terminal pin 46 of the relay portion in Embodiment 2 is modified. As shown in FIGS. 11 and 12, the terminal pin 47 in this example is the lead wire 15
It is a rod-like body that is provided at the tip of and has a cross-shaped cross section. The maximum width of the cross-sectional shape of the terminal pin 47 is larger than the upper hole 412 of the pin hole 41 provided in the terminal board 4 and slightly smaller than the lower hole 413, and its length is lower than that of the pin hole. It is slightly longer than the depth of the hole 413.

Therefore, when the terminal pin 47 is inserted into the pin hole 41, its lower end 472 projects from the pin hole 41. Therefore, when the terminal board 4 is pressed against the pin board 88, the lower end 472 is pressed against the head portion 121 of the probe terminal 12 and becomes electrically conductive.

As a method of providing the terminal pin 47 as described above at the tip of the lead wire 15, an enameled wire or other wire is pressed from four directions using a mold. Thereby, it can be formed extremely easily and inexpensively. Others are the same as in the second embodiment. Also in this example, the same effect as that of the second embodiment can be obtained.

Fourth Embodiment In this embodiment, as shown in FIGS. 13 and 14, the shape of the terminal pin 47 in the third embodiment is changed. That is, as shown in FIG. 14, the terminal pin 48 of the present example is provided with a cross-shaped cross-section head having grooves on all sides, which is made of solder, at the tip of the lead wire 15. The terminal pin 48 is formed by forming a solder mass 483 at the tip of the lead wire 15 as shown in FIG. 13 and then pressing the solder mass 483 from four sides using a mold. Others are the same as in the third embodiment.

[Brief description of drawings]

FIG. 1 is an overall explanatory view of an inspection jig according to a first embodiment.

FIG. 2 is a cross-sectional view around contact pins and a printed wiring board in a state before inspection according to the first embodiment.

FIG. 3 is a cross-sectional view around contact pins and a printed wiring board at the time of inspection in the first embodiment.

FIG. 4 is a developed front view of a socket and a stylus in the probe of the first embodiment.

FIG. 5 is a cross-sectional view of the tip portion of the probe in the first embodiment.

FIG. 6 is a front view of the contact pin according to the first embodiment.

FIG. 7 is a plan view of the guide plate according to the first embodiment.

8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is a sectional view of an electrical connection portion between the terminal pin and the probe in the first embodiment.

FIG. 10 is a sectional view of an electrical connection portion between a terminal pin and a probe according to the second embodiment.

FIG. 11 is a sectional view of an electrical connection portion between a terminal pin and a probe according to the third embodiment.

FIG. 12 is an enlarged perspective view of a terminal pin according to the third embodiment.

FIG. 13 is a front view of a terminal pin before being processed in Example 4.

FIG. 14 is an enlarged perspective view of a terminal pin according to the fourth embodiment.

FIG. 15 is an overall explanatory view of an inspection jig in a conventional example.

FIG. 16 is an explanatory diagram around the probe of the inspection jig in the conventional example.

[Explanation of symbols]

 1. ． ． Probe, 11. ． ． Socket, 12. ． ． Probe terminal, 15. ． ． Lead wire, 18. ． ． Inspector, 2. ． ． Stylus, 25. ． ． Tube, 3. ． ． Contact pin, 31. ． ． Tip, 4. ． ． Terminal board, 41. ． ． Pin holes, 45, 46, 47, 48. ． ． Terminal pin, 5. ． ． Pressure conductive rubber plate, 7. ． ． Printed wiring board, 71. ． ． High-density pitch wiring circuit, 75. ． ． 7. Wiring circuit with normal wiring pitch, 8. ． ． Guide plate, 85. ． ． Guide hole, 88. ． ． Pin board,

Claims (1)

[Claims] 1. An inspection jig for inspecting a wiring circuit in a printed wiring board according to the presence or absence of electrical continuity, the inspection jig including a guide plate, a pin board, and a contact for contacting the wiring circuit. The probe includes a pin and a probe having a stylus for making contact with the contact pin, and the contact pin is mounted on the guide plate so as to be movable back and forth, and the stylus is elastically mounted on the probe so as to be movable forward and backward. Further, a terminal board is arranged on the pin board, a pin hole is provided in the terminal board, and a terminal pin having a lead wire connected to one end is arranged in the pin hole. In addition, the inspection jig for a printed wiring board, wherein the terminal pin and the probe terminal of the probe are electrically connected to each other at positions facing each other.