TWI458183B - Contact probe - Google Patents

Description

Connection terminal

The present invention relates to a connection terminal for electrically connecting a circuit board to each other.

Conventionally, in the technical field of electrical property inspection of a semiconductor integrated circuit or the like, it has been known to arrange a plurality of connection terminals with a corresponding semiconductor integrated circuit, whereby the connection terminal and the semiconductor integrated circuit are physically The technology associated with the connection unit to ensure the function of electrical conduction. The connection terminal to be used is configured to have at least a plurality of connection terminals and a connection terminal holder that holds the connection terminals.

Here, the connection terminal has two conductive members provided at both ends, and the two contact members are connected by a coupling portion having a concave shape and a convex shape, and are coiled by a coil spring. The longitudinal direction of the contact member is biased. The contact terminal is retractably connected to the semiconductor integrated circuit by the spring coil, and thereby mitigating the impact of the contact member in contact with the semiconductor integrated circuit.

As such a contact terminal, for example, a contact probe that can electrically expand the mutual contact portion without reducing the spring volume is known (for example, see Patent Document 1). The contact probe has a cantilever arm that engages the first constituent member and the second constituent member to be interlockable by the protrusion for contact.

(previous technical literature)

(Patent Literature)

Patent Document 1: Special Table 2008-546164

However, the conventional connecting terminal disclosed in Patent Document 1 has a length in which the arm (the cantilever arm) that is connected to the two contact members is closely connected to the arm or the length of the linked tab of the arm. If necessary, at the same time repeating the loading and unloading of the two contact members, the arm is distorted to cause the resistance to be unstable, and there is no possibility of achieving a reliable conduction.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a connection terminal which can be reliably turned on with a simple configuration.

In order to solve the above problems, and to achieve the object, the connection terminal of the present invention includes: a conductive first contact member having a first tip end portion having a tip end tapered shape and a first columnar body having a substantially columnar shape coaxially The second contact member having conductivity has a second front end portion having a front end tapered shape on the coaxial side, and two substantially cylindrical portions extending in parallel with each other in the longitudinal direction, and the foregoing a base end portion enters between the two arm portions and at least a second base end portion that is in contact with one of the arm portions; and a coil spring is mounted such that one end is press-fitted into the first contact member, and the other end portion is pressed into the aforementioned The second contact member biases the first and second contact members toward the first and second front end portions, respectively.

Further, in the connection terminal of the present invention, in the above invention, the coil spring is characterized in that at least the surface thereof has insulation properties. Furthermore, in the connection terminal of the present invention, in the above invention, the coil spring has a higher electrical resistivity than the first and second contact members.

Furthermore, the connection terminal of the present invention is characterized in that the first contact member has a first flange portion coaxially from a base end portion of the first front end portion. Extending to have a diameter larger than a diameter of the first tip end portion, and the first boss portion is different from a connecting portion of the end portion of the first flange portion and the first front end portion One of the second extending members has a diameter smaller than a diameter of the first flange portion; the second contact member has a second flange portion extending from a proximal end side of the second front end portion and having a second flange portion a diameter larger than a diameter of the second front end portion; and the second hub portion extends from one of the end portions of the second flange portion and the second front end portion to be different from the aforementioned a diameter of the second flange portion having a smaller diameter; the coil spring is pressed into the first and second hub portions; the first base end portion is from the end portion of the first hub portion and the first portion One side of the flange side of the flange portion extends, having the first a diameter of the portion having a smaller diameter; the second base end portion extends from one of the end portions of the second hub portion and the connecting side of the second flange portion, and has a diameter larger than the diameter of the second hub portion Smaller diameter.

In the connecting terminal of the present invention, the first base end portion enters between the two arm portions extending in parallel with each other in the extending side direction, and is in contact with at least one of the arm portions, so that the distance between the arm portions is not expanded by the first base end portion. The contact pressure between the arm portion and the first base end portion is generated by a load from a direction perpendicular to the axis of the contact terminal to maintain the sliding state of the first base end portion and each arm portion wall surface, which is simple. The composition can achieve the effect of achieving a true conduction.

Embodiments of the present invention will be described in detail below with reference to the drawings. Further, the present invention is not limited to the following embodiments. In addition, the drawings referred to in the following description are merely illustrative of the shape, size, and positional relationship in which the contents of the present invention can be understood. That is, the present invention is not limited by the shape, size, and positional relationship illustrated in the drawings.

Fig. 1 is a partial cross-sectional view showing the configuration of a connection terminal according to an embodiment of the present invention. Fig. 2 is an exploded perspective view showing the configuration of a main portion of the connection terminal shown in Fig. 1. The connection terminals 1 shown in FIGS. 1 and 2 are electrically connected between the objects to be connected by being brought into contact with the respective connection objects at both ends.

The connection terminal 1 has a first contact member 10 having a conductivity and one end portion is in contact with the connection object and electrically connected to each other, and has a substantially flat shape; the conductive portion and the one end portion are connected to the connection object. a substantially planar second contact member 20 that is in contact with the first contact member 10 while being in contact with and electrically connected; and, for the longitudinal direction of the first contact member 10 and the second contact member 20 Telescopic coil spring 30.

The first contact member 10 has, on the coaxial side, a front end portion 11 (first front end portion) having a plurality of convex portions 11a forming a front end tapered shape; and extending from a base end portion of the front end portion 11 than the front end portion 11 a flange portion 12 having a width having a larger width; a hub portion 13 extending from a different end portion from a side connected to the flange portion 12 and the front end portion 11 and having a width smaller than a width of the flange portion 12; The end portion different from the connection side of the hub portion 13 and the flange portion 12 extends to have a base end portion 14 (first base end portion) having a width smaller than the width of the hub portion 13.

The second contact member 20 has, on the coaxial side, an end portion 21 (second front end portion) which is formed before the end portion is tapered, and has a width larger than the width of the front end portion 21 from the base end side of the front end portion 21. a flange portion 22; a hub portion 23 extending from a different end portion from the front end portion of the flange portion 22 and having a smaller width than the width of the flange portion; and, from the hub portion 23 and the flange portion 22 A base end portion 24 (second base end portion) having a different width from the end portion of the connecting side and having a smaller width than the width of the hub portion 23 is formed.

The base end portion 24 has two arm portions 24a and 24b which are formed in a substantially columnar shape and which extend in parallel with each other in the longitudinal direction. The distance between the arms 24a, 24b is more than the width of the base end portion 14. The base end portion 14 enters between the two arm portions 24a, 24b and is in contact with the wall surfaces of the arm portions 24a, 24b. Further, when the proximal end portion 14 enters between the arm portions 24a and 24b, an appropriate contact pressure with the arm portion is obtained by a load applied from a direction perpendicular to the axis of the connection terminal 1, and only one of the arm portions is in contact with each other. However, the arm portions 24a and 24b are provided corresponding to this, and the distance between the arm portions 24a and 24b may be larger than the width of the base end portion 14.

The first contact member 10 and the second contact member 20 are made of a noble metal or a noble metal alloy and formed by cutting. The noble metal is, for example, a metal such as gold (Au), silver (Ag), platinum (Pt), palladium (Pd) or rhodium (Rh). Further, the noble metal alloy is an alloy containing any of the above noble metals. Further, the noble metal may be coated on the first contact member 10 and the second contact member 20 which are formed of copper, a copper alloy or iron.

The coil spring 30 is formed by forming a spiral wound wire as shown in Fig. 2 . The diameter of the inner circumference side of the circle is larger than the width of the base end portion 24, and does not reach the width of the hub portions 13, 23. The coil spring 30 is press-fitted into the hub portion 13 at one end as shown in Fig. 1, and the other end is pressed into the hub portion 23 and fixed, and is engaged with the first contact member 10 and the second contact member. The state surrounds the base ends 14, 24. Further, one end side of the coil spring 30 abuts against the flange portion 12, and an elastic force is applied to the front end portion 11 side of the first contact member 10. Similarly, the other end side of the coil spring 30 abuts against the flange portion 22, and an elastic force is applied to the front end portion 21 side of the second contact member 20. Further, since the coil spring 30 is not subjected to the plane grinding processing at the end portion, the axis of the coil spring 30 is deviated from the axis of the connection terminal 1 by the expansion and contraction, and the load in the vertical direction is applied to the axis of the connection terminal 1.

Furthermore, the coil spring 30 is insulating at least on the surface. The insulation can be ensured by coating the surface of the coil spring 30 with an insulating resin such as enamel, or with an insulating resin or ceramics, or with a first or second The wire of the higher resistance of the contact member is formed into a coil shape. By covering the entire surface of the coil spring 30, it is possible to prevent the allowable current from being lowered due to the heat generated by the coil inductance due to the coil spring current flowing.

Referring to Fig. 3, a description will be given of a case where a force is applied to both ends of the self-connecting terminal. Fig. 3 is a partial cross-sectional view showing the configuration of a connection terminal according to an embodiment of the present invention. As shown in Fig. 3, when the front end portions 11 and 21 of the connection terminal are applied with a force F1 (arrow direction in Fig. 3) toward the respective end portions 14, 24 in the longitudinal direction of the connection terminal, the base end portion 14 is along The walls of the arms 24a, 24b slide in the longitudinal direction. At this time, the coil spring 30 is compressed, and an elastic force opposite to the load direction of the force F1 is applied to the first contact member 10 and the second contact member 20. In this manner, the coil spring 30 contracts and relieves the impact with respect to the force from the outside, and the contact state with the object to be connected can be made more sure by applying an elastic force in a direction opposite to the force.

When the distal end portions 11 and 21 of the connection terminal 1 according to the embodiment of the present invention are in contact with the object to be connected, the load due to the contact is absorbed by the contraction of the coil spring 30, and the coil spring 30 is transmitted. The flange portions 12 and 22 apply an elastic force in a direction opposite to the force applied from the object to be connected to the object to be connected, whereby the contact with the object to be connected can be made more sure, and the connection object between the two ends of the connection terminal is brought into contact with each other. Electrically conductive.

Further, when the base end portion 14 enters between the arm portions 24a, 24b, the distance between the arm portions 24a, 24b is not expanded by the base end portion 14, but the load is applied perpendicularly to the axis of the connecting terminal 1 The state in which the base end portion 14 is in sliding contact with the wall surfaces of the arm portions 24a and 24b can be maintained, and the conduction state between the first contact member 10 and the second contact member 20 can be maintained in a simple configuration. Further, by applying a bottom ring grinding (plane grinding process) to a portion of the coil spring 30 that abuts against the flange portions 12, 22, it is possible to suppress the axis of the coil spring 30 from being offset from the axis of the connecting terminal, and it is possible to The load in the axial direction of the connection terminal 1 becomes small.

Here, the electrical connection between the first contact member 10 and the second contact member 20 is insulated because the contact portion of the coil spring 30 with the first contact member 10 and the second contact member 20 is insulated, and the current is not conducted. To the coil spring 30, the electrical conduction between the contact members can be reliably achieved in the shortest path.

Further, the front end portion 21 of the second contact member 20 may be configured to have a convex portion, and each of the front end portions 11 and 21 of the first contact member 10 and the second contact member 20 may be configured to have a convex portion.

Further, the coil spring can be wound into a substantially rectangular shape in a direction in which the spring extends. The length of one of the rectangles is the length of the hub portions 13 and 23, and the other side length is the length of the first and second contact members. With this coil spring, the thickness of the connection terminal can be reduced, and the thickness can be narrowed accordingly.

Fig. 4 is an exploded perspective view showing the configuration of a main part of a connection terminal according to a modification of the embodiment. In addition, the same components as those of the above-described connection terminal 1 in Fig. 1 and the like are denoted by the same reference numerals. The connection terminal 2 shown in FIG. 4 has a first contact member 40 having electrical conductivity, one end portion of which is in contact with the connection object and electrically connectable, and the second contact member 50 is electrically conductive. One end portion is in contact with the connection object and is electrically connectable, and is electrically connected between the connection objects by contact with the first contact member 40; and the coil spring 30 is attached to the first contact member 40 It is biased and stretchable in the longitudinal direction of the second contact member 50.

The first contact member 40 has a distal end portion 41 (first distal end portion) coaxially, and has a plurality of convex portions 41a that are in contact with the connection object and are electrically connected to each other to form a front end tapered shape; the flange portion 42 Extending from the base end side of the front end portion 41, having a diameter larger than the diameter of the front end portion 41; the boss portion 43 having a different end portion from the side connected to the flange portion 42 and the front end portion 41, and having a ratio The smaller diameter of the blue portion 42; and the base end portion 44 (first base end portion) extending from a different end portion from the side where the hub portion 43 and the flange portion 42 are connected, and having a diameter larger than that of the hub portion 43 Smaller diameter.

The convex portion 41a is processed into a predetermined shape by, for example, cutting by a rotary cutter. At this time, the angle formed by the inner side surface of each convex portion 41a and the base axis of the distal end portion 41 is determined by the angle formed at the vertex shape of the blade edge of the rotary cutter. Furthermore, by changing the apex angle of the rotary cutter, the angle at which the convex portion 41a is formed can be adjusted.

The second contact member 50 has a front end portion 51 (second front end portion) coaxially connected to the connection object and electrically connected to form a front end tapered shape; the flange portion 52 from the base end of the front end portion 51 The side is extended to have a diameter larger than the diameter of the front end portion 51; the boss portion 53 extends from a different end portion from the side where the flange portion 52 and the front end portion 51 are connected, and has a smaller diameter than the flange portion 52. The base end portion 54 (second base end portion) extends from a different end portion of the hub portion 53 and the flange portion 52 on the side in which it is connected, and has a smaller diameter than the diameter of the hub portion 53.

The base end portion 54 has two arm portions 54a, 54b extending in parallel with each other in the longitudinal direction. The distance between the arms 54a, 54b is equal to the diameter of the base end portion 44. The base end portion 44 enters between the two arm portions 54a, 54b and is in contact with the wall surfaces of the arm portions 54a, 54b. Further, when the proximal end portion 44 enters between the arm portions 54a and 54b, it is only necessary to contact at least one of the arm portions, and the arm portions 54a and 54b are provided corresponding to the proximal end portion, and between the arm portions 54a and 54b. The distance is not equal to the diameter of the base end portion 44.

In the above modification, when the base end portion 44 enters between the arm portions 54a, 54b, since the distance between the arm portions 54a, 54b is not expanded by the base end portion 44, the base end portion 44 and the arm portion can be maintained. The sliding state of 54a, 54b maintains a stable conduction state between the first contact member 40 and the second contact member 50.

(industrial use possibility)

As described above, the connection terminal of the present invention can be effectively utilized in connection between the circuit boards and the like and electrically connected.

1, 2. . . Connection terminal

10, 40. . . First contact member

11, 21, 41, 51. . . Front end

11a, 41a. . . Convex

12, 22, 42, 52. . . Flange

13, 23, 43, 53. . . Hub

14, 24, 44, 54. . . Base end

20, 50. . . Second contact member

24a, 24b, 54a, 54b. . . Arm

30. . . Coil spring

Figure 1 is a partial cross-sectional view showing the configuration of a connection terminal according to an embodiment of the present invention;

Fig. 2 is an exploded perspective view showing the configuration of a main portion of the connection terminal shown in Fig. 1;

Figure 3 is a partial cross-sectional view showing the configuration of a connection terminal according to an embodiment of the present invention;

Fig. 4 is an exploded perspective view showing the configuration of a main part of a connection terminal according to a modification of the embodiment of the present invention;

1. . . Connection terminal

10. . . First contact member

11, 21. . . Front end

11a. . . Convex

12, 22. . . Flange

13,23. . . Hub

14, 24. . . Base end

20. . . Second contact member

24a, 24b. . . Arm

30. . . Coil spring

Claims (4)

A connection terminal comprising: a first contact member having conductivity; a first front end portion having a front end tapered shape and a first base end portion having a substantially columnar shape; and a second contact member having conductivity a second front end portion having a front end tapered shape on the coaxial side, and two substantially cylindrical portions extending in parallel with each other in the longitudinal direction, and the first base end portion enters the two arm portions a second base end portion that is in contact with at least one of the arm portions; and a coil spring that is mounted such that one end is press-fitted into the first contact member, and the other end portion is pressed into the second contact member, and the first portion is And the second contact members are respectively biased in the direction of the first and second front end portions; and the first base end portion and the two are maintained by the coil spring applying a load in a direction perpendicular to an axis of the connecting terminal The sliding state of the wall of the arm. The connection terminal according to claim 1, wherein the coil spring has at least a surface having an insulating property. The connection terminal according to claim 1, wherein the coil spring has a higher electrical resistivity than the first and second contact members. The connection terminal according to any one of the items 1 to 3, wherein The first contact member has a first flange portion extending from a base end portion of the first front end portion and having a diameter larger than a diameter of the first front end portion; and a first hub a portion extending from one end of the first flange portion to a side opposite to the first front end portion and having a diameter smaller than a diameter of the first flange portion; the second contact member is attached to Coaxially having: a second flange portion extending from a base end portion of the second front end portion and having a diameter larger than a diameter of the second front end portion; and a second hub portion from the second The end portion of the flange portion extends from one side different from the connection side of the second front end portion, and has a diameter smaller than a diameter of the second flange portion; the coil spring is pressed into the first and the first a second hub portion; the first base end portion extends from one of the end portions of the first hub portion and the connecting side of the first flange portion, and has a diameter smaller than a diameter of the first hub portion; The second base end portion is from the end of the second hub portion A second coupling flange is different from said one side of the extending portion, and having a smaller diameter than the diameter of the second hub portion.