JP6801866B2 - Probe pin for large current - Google Patents

Description

The present invention relates to a probe pin for temporarily contacting the tip with a subject to energize. Specifically, the plunger (advancing / retreating member) and the coil spring (biasing member) are hollowed in a barrel (cylindrical guide member). More specifically, the present invention relates to a straight rod-shaped probe pin contained therein, and more particularly, a large current probe pin capable of energizing a large current.

FIG. 3 shows the structures of the conventional probe pins 10, 20, 30 and the socket 40, and FIG. 3A shows the probe pin 10 for a large current in which the sleeve 13 having both ends open is adopted as the tubular guide member. 3 (b) is an external view and a cross-sectional view of the large current probe pin 20 in which a barrel 23 having an opening at one end and a closed end at the other end is used for the tubular guide member. FIG. Is to accommodate the plunger 31 (advance / retreat member) and the coil spring 32 (biasing member) in the barrel 33 (cylindrical guide member), and then "caulking" the open end 33a of the barrel 33 to prevent them from coming off. 3A is an external view and a cross-sectional view of the probe pin 30, and FIG. 3D is an external view of a socket (connector) provided with a louver (cylindrical contactor).

A typical straight rod-shaped probe pin 10 for a large current (see FIG. 3A, Patent Document 1) is a metal conductive plunger 11 (advancing / retreating member) such as brass and a coil into which the plunger 11 can be loosely inserted. It is provided with a spring 12 (a urging member) and a cylindrical sleeve 13 (cylindrical guide member) through which a plunger 11 can be inserted. The plunger 11 is formed in an elongated round bar shape, and the sleeve 13 is formed with the plunger 11. The plunger 11 is urged upward by pushing the coil spring 12 so as to separate the upper end of the sleeve 13 and the upper end of the plunger 11 in a state where the coil spring 12 is fitted so as to be slidable and movable in the axial direction. ing. Moreover, in the probe pin 10 for large current, the lower end portion of the plunger 11 protrudes from the sleeve 13 so that the end portion of the electric wire can be connected, and the coil spring 12 is provided outside the sleeve 13.

The other probe pin 20 for large current (see FIG. 3B) is also a straight rod, but the lower half of the plunger 21 (advancing / retreating member) and the coil spring 22 (biasing member). All of them are housed in the hollow of the barrel 23 (cylindrical guide member).
In these high current probe pins 10 and 20, a contact member having excellent wear resistance is attached to the upper end surface (protruding end surface) of the plungers 11 and 21 (advancing / retreating member) to improve durability and improve durability. A large number of contact portions of pyramidal protrusions are formed on the contact portion on the upper surface of the contact member to improve the contact property and conductivity, and a large current such as 5A to 20A can be passed with low resistance. ing.

Further, the other straight rod-shaped probe pin 30 (see FIG. 3C) is not for a large current, but is assumed to be energized at 2 A or less, and is a plunger 31 (advance / retreat) composed of a small diameter portion and a large diameter portion. The large diameter portion of the member) and the entire coil spring 32 (biasing member) are housed in the hollow of the barrel 33 (cylindrical guide member). Moreover, in this probe pin 30, the open end 33a of the barrel 33 is "caulked" to narrow the open end 33a, and the large diameter portion of the plunger 31 hits the open end 33a, so that the plunger 31 is barreled. Since it does not fall out of 33, the plunger 31 can be used in any posture regardless of whether it is facing upward, downward, or sideways.
In these probe pins 20 and 30, continuity is ensured at both ends of the probe pins by contact between the outer peripheral surfaces of the plungers 21 and 31 and the hollow inner wall surfaces of the barrels 23 and 33.

Further (see FIG. 3D, Patent Document 2), although not a probe pin, a louver 42 (cylindrical contactor) was inserted into the socket 40 of the connector (40, 45) in the hollow of the base portion 41. Some are. The louver 42 is made of a thin conductive cylinder with both ends open, and the middle portion is slightly twisted to have a smaller diameter than both ends. Moreover, some slits are formed in the entangled part in order to impart easiness of elastic deformation in the radial direction.
Therefore, when the rod-shaped contact 45 of the plug is inserted into the louver 42 (cylindrical contact) of the socket 40, the rod-shaped contact 45 and the louver 42 (cylindrical contact) are fitted with an appropriate contact pressure and are stable. The electrical conduction state is established.

Japanese Unexamined Patent Publication No. 2011-137791 Japanese Unexamined Patent Publication No. 2003-132975

Among such conventional straight rod-shaped probe pins, the large current probe pins 10 and 20 are equipped with a contact member for the upper end surface of the plunger 11 (see FIGS. 3A and 3B) and the coil spring 12 , 22 is strengthened, and the wire end is connected to the lower end of the plunger 11 (see FIG. 3A), or a large contact area between the outer peripheral surface of the plunger 21 and the hollow inner wall surface of the barrel 23 is secured. The voltage between both ends of the probe pin is kept to a minimum even if the passing current is relatively large.

On the other hand, the probe pin 30 in which the hollow inclusions 31 and 32 are caulked to prevent them from coming off at the open end 33a of the barrel 33 (see FIG. 3C) has a high degree of freedom in posture during use. Since it is rather slender and the spring force is weak and the contact area between the outer peripheral surface of the plunger 31 and the hollow inner wall surface of the barrel 33 is small, the electrical resistance between the plunger 31 and the barrel 33 is a probe for a large current. Since it is larger than the pin 20, if the passing current at the time of measurement is large, the voltage between both ends of the probe pin may become excessive. Therefore, it is often used for the measurement at a place where the passing current is relatively small.

However, in recent years, there has been an increasing demand for using such an easy-to-use probe pin 30 for measurement of a portion having a larger passing current than before.
In order to respond to this, it is necessary to reduce the electrical resistance between the plunger 31 and the barrel 33, and in order to realize this without making it as large as the probe pin 20 for large current, it has already been described. It is conceivable to introduce a so-called electrical conduction stability establishment member that fits with the plunger 31 with an appropriate contact pressure like the louver 42 of the socket 40, and interpose it between the plunger 31 and the barrel 33.

However, the introduction of additional members increases not only the cost of the members but also the construction costs such as assembly and adjustment, and the total length of the probe pin increases as the length of the hollow barrel for accommodating the additional members increases. There is also an inconvenient aspect such as.
Therefore, it is a probe pin for large current that can prevent not only small current but also large current, and is a louver or the like (cylindrical contact) that fits into the plunger (advance / retreat member) with an appropriate contact pressure. It is a technical issue to realize a probe pin for a large current in which the construction cost and the increase in the total length are small even if the child) is introduced into the hollow of the barrel (cylindrical guide member).

The probe pin for large current of the present invention (Solution 1) was devised to solve such a problem, and includes a conductive tubular guide member having a bottomed hollow bore from one end. It is provided with a small-diameter portion and a large-diameter portion, and the large-diameter portion is housed in a conductive advancing / retreating member in which the large-diameter portion is housed in the hollow while the tip portion of the small-diameter part is projected from the hollow, and is housed near the bottom of the hollow. A conductive probe pin for a large current including an urging member that pushes the advancing / retreating member toward the hollow opening side, and includes a tubular annular trunk portion and a branch branch portion branched from the tubular annular trunk portion. The tubular contact is press-fitted into the hollow of the tubular guide member and stops near the opening of the hollow, and at the same time, the small diameter portion of the advancing / retreating member is inserted through the hollow, and the branch branch portion of the tubular contact is formed. In each case, the small-diameter portion is elastically deformed and is in contact with the outer peripheral surface of the small-diameter portion, and the large-diameter portion of the advance / retreat member is in contact with the end surface of the tubular contactor closer to the urging member. It is characterized in that the member is prevented from coming off.

In such a probe pin for a large current of the present invention (solution 1), by introducing a tubular contactor which is a member for establishing stability of electrical conduction, electricity between the advancing / retreating member and the tubular guide member is obtained. Since the resistance becomes smaller, it can be used not only for small currents but also for large currents.
In addition, since the tubular contactor incorporated by press-fitting prevents the advancing / retreating member from coming off, the "caulking" process, which requires more construction cost than press-fitting, is not required, and the construction cost can be reduced by the difference. The increase is suppressed.

Further, the positioning function of aligning the axial center of the advancing / retreating member with the axial center of the tubular guide member is not only exerted by fitting the hollow inner wall surface of the tubular guide member with the outer peripheral surface of the large diameter portion of the advancing / retreating member. In addition to that, since it is also exhibited by the contact between the outer peripheral surface of the small diameter portion of the advancing / retreating member and the branch branch portion of the tubular contactor, the large diameter portion of the advancing / retreating member can be shortened without any problem.
Therefore, the increase length due to the introduction of the tubular contactor is offset or diminished by the total length of the shortened portion of the large diameter portion of the advancing / retreating member and the shortened portion of the above-mentioned "caulking" retaining portion. The increase in the total length of the pin is small.

Regarding Example 1 of the present invention, the structure of a probe pin for a large current is shown, (a) is an external view, (b) is an external view showing the inside with a broken line, (c) is a sectional view, and (d) is developed. The figure, (e) is a material diagram of a contact (cylindrical contact), the upper part of (f) is an external view of the contact as seen from the annular trunk, and the upper part of (f) is the branch branch of the contact. (G) is a cross-sectional view of a probe pin for a large current in which a plunger (advancing / retreating member) is pushed. Regarding Example 2 of the present invention, the structure of the probe pin for large current is shown, (a) is an external view, (b) is an external view showing the inside with a broken line, (c) is a sectional view, and (d) is developed. FIG. 3 (e) is a cross-sectional view of a probe pin for a large current in which a plunger is pushed. The structure of the conventional product is shown, (a) is an external view and a cross-sectional view of a probe pin for large current that employs a sleeve with both ends open in the tubular guide member, and (b) is a tubular guide member with one end open and the other end closed. (C) is an external view and cross-sectional view of a probe pin with a plunger or the like processed to prevent it from coming off, and (d) is a louver (cylindrical contactor). ) Is an external view of a socket (connector) provided with).

A specific embodiment for carrying out such a probe pin for a large current of the present invention will be described with reference to Examples 1 and 2 below.
The first embodiment shown in FIG. 1 embodies the above-mentioned solution 1 (claim 1 at the time of filing the application), and the second embodiment shown in FIG. 2 is a modified example thereof.

The specific configuration of the first embodiment of the probe pin for large current of the present invention will be described with reference to the drawings.
1 (a) to 1 (d) show the whole probe pin 50 for a large current in a free state, (a) is an external view, (b) is an external view showing the inside with a broken line, (c). Is a cross-sectional view, and (d) is a developed external view. Further, in FIG. 1, (e) is a surface view of a plate-shaped material of the contact 54 (cylindrical contact), and (f) is an external view of the contact 54 viewed from the annular trunk portion 54a side in the upper portion. The side portion is an external view of the contact 54 viewed from the branch branch portion 54b side, and (g) is a cross-sectional view of the probe pin 50 for a large current in a used state in which the plunger 51 (advancing / retreating member) is pushed.

The probe pin 50 for a large current is modified to reduce the electrical resistance so that the above-mentioned probe pin 30 can pass through not only a small current but also a large current of 5 A or more without any inconvenience, and is a plunger as an advancing / retreating member. It includes a 51, a coil spring 52 as an urging member, a barrel 53 as a tubular guide member, and a contact 54 as a tubular contactor.
The plunger 51 (advance / retreat member) follows the plunger 31 described above, and includes a small diameter portion 51a and a large diameter portion 51b made of good electric conductors, and the diameters of the respective portions 51a and 51b are described above. However, the length of the small diameter portion 51a is slightly longer than that described above, and the length of the large diameter portion 51b is slightly shorter than that described above.

The coil spring 52 (urging member) may be the same as the coil spring 32 described above not only in shape but also in spring characteristics, and is housed in the hollow 53b of the barrel 53 and placed near the bottom of the hollow 53b. Then, the plunger 51 is also housed in the hollow 53b of the barrel 53 with the large diameter portion 51b first, and is brought close to the coil spring 52, so that the plunger 51 projects the tip of the small diameter portion 51a from the hollow 53b of the barrel 53. In this state, the large diameter portion 51b is housed in the hollow 53b, and the coil spring 52 is housed in the hollow 53b of the barrel 53 to push the plunger 51 toward the opening side of the hollow 53b.

The barrel 53 (cylindrical guide member) follows the barrel 33 described above, and is made of a good electric conductor having a stepped round bar-like appearance, but the bottomed hollow 53b is at the other end from the opening end 53a. It has a shape that is perforated to the front. The outer diameter of each stage and the diameter of the hollow 53b are the same as those of the barrel 33 described above, but the opening end portion 33a is not "caulked", and the depth of the hollow 53b and the barrel 53 The total length is slightly longer than those of the barrel 33 described above.

The contact 54 (cylindrical contactor) is as if the above-mentioned louver 42 is divided into two in the axial direction, and is divided into a cylindrical annular trunk portion 54a and a plurality of contacts (four in the illustrated example). It consists of branched branches 54b, ..., 54b called branched wings. This is made by, for example, a molding process in which a flat plate of a good electric conductor punched into a mountain range shape (see FIG. 1 (e)) is rolled into a tubular shape, and a plurality of branch branches 54b are all brought to the axial center. ..
Then, the annular trunk portion 54a is press-fitted from the opening end portion 53a into the hollow 53b of the barrel 53 containing the coil spring 52 and the plunger 51, and then the branch branch portion 54b is further pushed in so that the entire contact 54 is hollow 53b. Fits in.

In this way, the probe pin 50 for large current is assembled, and in the free state of a single unit (see FIGS. 1A to 1C), the coil spring 52 can be expanded and contracted in the hollow 53b of the barrel 53 near the bottom. The contact 54 is fixedly held in a state close to the opening end portion 53a, and the large diameter portion 51b of the plunger 51 is sandwiched between one end of the coil spring 52 and the annular trunk portion 54a of the contact 54, from which the plunger 51 is held. The small diameter portion 51a of the above penetrates the axial center of the contact 54 and further penetrates the open end portion 53a of the barrel 53, and protrudes outward from the barrel 53.

Then, in such a free state, the contact 54 (cylindrical contact) inserts the small diameter portion 51a of the plunger 51 (advancing / retreating member), and the plurality of branch branch portions 54b of the contact 54 are all elastic. Since it is deformed and continues to contact the outer peripheral surface of the small diameter portion 51a, the electric resistance between the plunger 51 and the contact 54, and thus the electric resistance between the plunger 51 and the barrel 53 is kept to a minimum, and the small diameter portion 51a of the plunger 51 is kept to a minimum. Since the centripetal force that approaches the center of the hollow 53b of the barrel 53 acts, the large diameter portion 51b of the plunger 51 can be shortened. Moreover, the frictional force between the plunger 51 and the contact 54 due to the contact is moderately reduced and relaxed due to the elastic deformation of the branch branch portion 54b formed like a cantilever. Therefore, the elastic force of the coil spring 52 does not hinder the advance / retreat movement of the plunger 51.

Further, in the free state, the large diameter portion 51b of the plunger 51 (advancing / retreating member) comes into contact with the end surface of the contact 54 (cylindrical contactor) near the coil spring 52 (biasing member), so that the contact 54 comes into contact with the barrel 53. Since it is prevented from falling out of the hollow 53b of the (cylindrical guide member), the "caulking" of the opening end portion 33a of the probe pin 30 described above is unnecessary. Further, due to the additional introduction of the contact 54, the total length of the barrel 53 and thus the probe pin 50 for a large current is increased from the total length of the barrel 33 and the probe pin 30 described above, but the amount of increase is larger than the total length of the contact 54. It is small, and the thickness of the "caulking" of the barrel 33 described above and the length reduction from the large diameter portion of the plunger 31 to the large diameter portion 51b of the plunger 51 described above are subtracted from the total length of the contact 54. Stay in length.

The usage mode and operation of the large current probe pin 50 of Example 1 will be described. The large current probe pin 50 is used in the same manner as the probe pins 10 and 30 described above in that the tip of the small diameter portion 51a of the plunger 51 (advancing / retreating member) is temporarily brought into contact with the subject during measurement. However, for wiring to the other end prior to measurement, an electric wire is connected to the tip of the barrel 53 (cylindrical guide member) in the same manner as the lower end of the plunger 11 (advance / retreat member) of the probe pin 10 for large current. Alternatively, the tip of the barrel 53 (cylindrical guide member) may be densely planted in the wiring portion of the printed circuit board in the same manner as the tip of the barrel 33 (cylindrical guide member) of the probe pin 30, or the socket described above. It is easy to use because it can be connected even if it is inserted into the 40 holes.

Then, when the tip of the small diameter portion 51a of the plunger 51 is pressed against the subject during measurement, the plunger 51 (advancing / retreating member) presses and contracts the coil spring 52 (biasing member) while the barrel 53 (cylindrical guide member) is hollow. It recedes into 53b (see FIG. 1 (g)), and when it is separated from the subject, it is pushed by the repulsive force of the coil spring 52 that exceeds the frictional force between the small diameter portion 51a of the plunger 51 and the branch branch portion 54b of the contact 54. The plunger 51 advances (see FIGS. 1 (a) to 1 (c)), but at that time, the large diameter portion 51b of the plunger 51 is guided by the inner peripheral wall of the hollow 53b, and the plunger 51 is closer to the tip of the small diameter portion 51a. Is guided by a plurality of branch branches 54b of the contact 54 (cylindrical contactor), so that the plunger 51 smoothly advances and retreats along the axial center of the barrel 53.

In this way, the probe pin 50 for large current is easily used and operates without any inconvenience, like the probe pin 30.
Moreover, the energization allowable range expanded beyond the probe pin 30 by the introduction of the contact 54 (cylindrical contact) ranges from a small current of 2 A or less to a large current of 5 A or more.

The specific configuration of the second embodiment of the probe pin for large current of the present invention will be described with reference to the drawings. 2 (a) to 2 (d) show the entire probe pin 60 for a large current in a free state, (a) is an external view, (b) is an external view showing the inside with a broken line, (c). Is a cross-sectional view, and (d) is a developed view. Further, FIG. 2E is a cross-sectional view of the probe pin 60 for a large current in a used state in which the plunger 61 (advancing / retreating member) is pushed.

The large current probe pin 60 differs from the large current probe pin 50 of the first embodiment described above in that the one-piece plunger 51 has become a two-body plunger 61 + 62 (advance / retreat member), and the contact. When the 54 (cylindrical contact) is inserted into the hollow 53b of the barrel 53, the branch branch portion 54b is first and the annular trunk 54a is then press-fitted, and the annular trunk 54a is located at the open end 53a of the barrel 53. This is a point where the branch branch portion 54b is located near the center of the hollow 53b. The plunger 61 + 62 (advance / retreat member) is divided into a plunger main part 61 (small diameter part) which is a modification of the small diameter part 51a of the plunger 51 and a large diameter part 62 (large diameter part) which follows the large diameter part 51b of the plunger 51. The two are combined in the hollow 53b of the barrel 53.

The plunger main part 61 is a single round bar-shaped member made of a good electric conductor, but includes several parts having different diameters. Specifically, the tip portion 61a that is temporarily brought into contact with the subject at the time of measurement, the subsequent medium diameter portion 61b, the small diameter portion 61c having substantially the same diameter as the small diameter portion 51a of the plunger 51, and the end portion having a smaller diameter. It is provided with an insertion portion 61d located on the opposite side of the tip portion 61a and a tapered portion 61e located between the middle diameter portion 61b and the small diameter portion 61c, of which the tip portion 61a and the middle diameter are provided. The portion 61b, the tapered portion 61e, and the small diameter portion 61c are included in the small diameter portion to be compared with the large diameter portion 62. Since the tip portion 61a of such a plunger main part 61 is larger than the tip portion of the plunger 51, pain can be reduced even if the contact with the subject is repeated or a large current is passed. There is.

The large-diameter portion 62 is made of a slightly thick disk-shaped body, and has through holes formed in the center and the axial center thereof. The probe pin 60 for large current is assembled by inserting the coil spring 52, the large diameter portion 62, and the contact 54 in the hollow 53b of the barrel 53 in that order and then inserting the plunger main portion 61. At that time, the large diameter portion The insertion portion 61d of the plunger main part 61 is inserted into the through hole of 62. Then, in that state, even when the plunger main part 61 is pushed in, the large diameter part 62 is always pressed against the plunger main part 61 by the coil spring 52, so that the plunger main part 61 and the large diameter part 62 Are coming back and forth together.

In this case, the length from the tip portion 61a to the small diameter portion 61c of the plunger main part 61 is equal to the length of the small diameter portion 51a of the plunger 51 described above, and the length and thickness of the large diameter portion 62 and the large diameter portion 51 described above are large. Since the length and thickness of the diameter portion 51b are equal, the high current probe pin 60 shows high compatibility with the above-mentioned high current probe pin 50 in terms of mounting and measurement specifications. Further, of the plunger 61 + 62 (advancing / retreating member), the large diameter portion 62 is surely prevented from coming off by abutment with the branch branch portion 54b of the contact 54.

Further, the plunger main part 61 is held by friction with the branch branch part 54b of the contact 54 so as not to come off with a weak force of about its own weight. Therefore, under normal use conditions, the large current probe pin 60 can be used in a free posture like the above-mentioned large current probe pin 50. Nevertheless, when the plunger main part 61 is artificially pulled strongly, it overcomes the above friction and moves to separate from the barrel 53 while leaving the large diameter part 62 between the contact 54 and the coil spring 52. , The plunger main part 61 can be replaced or reattached without pulling out the contact 54. Therefore, the probe pin 60 for large current is a barrel 53 for the plunger main part 61 which is damaged and wants to be replaced when the tip portion 61a of the plunger main part 61 is damaged due to contact with a subject or repeated energization. By simply pulling out the hollow 53b from the hollow 53b to the opening side (upward in the figure) and then inserting a new plunger main part 61, the problem can be solved and the product can be continued to be used.

Further, in the probe pin 60 for large current in the free state (see FIGS. 2A to 2C), the tip portion 61a, the medium diameter portion 61b, and a part of the small diameter portion 61c of the plunger main parts 61 are the barrel 53. Since the plunger 61 + 62 is advanced from the hollow 53b, the radial positioning of the plunger 61 + 62 is only due to the inner peripheral wall of the hollow 53b of the barrel 53 with respect to the large diameter portion 62 and the branch branch portion 54b of the contact 54 with respect to the small diameter portion 61c. Although the positioning of the large-diameter portion 62 is steadily performed, it is difficult to perfectly align the positioning of the contact 54 with respect to the small-diameter portion 61c by the branch branch portion 54b, and in the very vicinity of the large-diameter portion 62. Since this is done, the tip portion 61a of the plunger main portion 61 is often slightly deviated from the axial center of the barrel 53.

On the other hand, in the plunger main part 61, the outer diameter of the middle diameter portion 61b is slightly smaller than the inner diameter of the annular trunk portion 54a of the contact 54, and the axial centers of the plunger main portion 61 are substantially aligned when the middle diameter portion 61b and the annular trunk portion 54a are fitted. When the tip portion 61a is pushed and the plunger main portion 61 retracts during measurement, the tapered portion 61e is first loosely fitted to the annular trunk portion 54a, and then the middle diameter portion 61b is annular. It is fitted to the trunk portion 54a (see FIG. 2E). Then, due to the strong centripetal force due to the fitting, the tip portion 61a of the plunger main part 61 moves laterally in a direction for eliminating the eccentricity with respect to the barrel 53, so that the surface of the contact portion of the subject is lightly rubbed. Therefore, the thin insulating oxide film is rapidly torn even under a low applied voltage, and the conductivity with the subject is increased, so that the measurement performance can be expected to be improved.

[Other]
In the above embodiment, the single high current probe pins 50 and 60 have been illustrated and described, but a large number of high current probe pins 50 and 60 may be erected and used on one support.
Further, the probe pins 50 and 60 for large current in the above embodiment can be accurately measured even in a place where a large current of 5 A or more passes, but the present invention is not limited to this, and a small current of 2 A or less is present. It also contributes to accurate measurement even in places where medium currents of 2A to 5A pass.
Further, in the above embodiment, the number of the branch branch portions 54b of the contact 54 is 4, but the number of the branch branch portions 54b is not limited to that, and may be another number such as 6, for example.

The probe pin for large current of the present invention can be used for electrical inspection and testing of semiconductor devices, printed wiring boards and other circuit boards.

10, 20 ... Large current probe pin, 30 ... Probe pin,
11,2,31 ... Plunger (advance / retreat member),
12, 22, 32 ... Coil spring (urging member),
13 ... Sleeve (cylindrical guide member), 23 ... Barrel (cylindrical guide member),
33 ... Barrel (cylindrical guide member), 33a ... Open end (caulking),
40 ... Socket (connector), 41 ... Base part, 42 ... Louver (cylindrical contactor),
50 ... Probe pin for large current,
51 ... Plunger (advance / retreat member), 51a ... Small diameter part, 51b ... Large diameter part,
52 ... Coil spring (urging member),
53 ... barrel (cylindrical guide member), 53a ... open end, 53b ... hollow,
54 ... contact (cylindrical contactor), 54a ... annular trunk, 54b ... branch branch,
60 ... Probe pin for large current,
61 + 62 ... Plunger (advance / retreat member), 61 ... Plunger main part,
61a ... Tip (subject contact), 61b ... Medium diameter,
61c ... Small diameter part, 61d ... Insert part, 61e ... Tapered part, 62 ... Large diameter part

Claims (1)

A conductive tubular guide member having a bottomed hollow formed from one end, a small diameter portion, and a large diameter portion are provided, and the large diameter portion is in a state where the tip portion of the small diameter portion protrudes from the hollow. A tubular probe pin for a large current including a conductive advancing / retreating member housed in a hollow and an urging member housed near the bottom of the hollow to push the advancing / retreating member toward the opening side of the hollow. A conductive tubular contact having an annular trunk and a branch branch portion branched from the annular trunk portion is press-fitted into the hollow of the tubular guide member and stops near the opening of the hollow, and the advance / retreat member of the advance / retreat member. The small diameter portion is inserted, and the branch branch portion of the tubular contactor is elastically deformed and is in contact with the outer peripheral surface of the small diameter portion, and the large diameter portion of the advancing / retreating member is the cylinder. A probe pin for a large current, characterized in that the advancing / retreating member is prevented from coming off by contacting the end face of the shape contactor near the urging member.

Images