JP2008014704A - Contact pin and socket for electric component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contact pin for stably keeping low the resistance value of the contact pin while stably keeping low resistance values at respective contact parts. <P>SOLUTION: This contact pin 21 is equipped on its both ends with first and second contact members 23 and 25. The first contact member 23 comprises a tubular part 23c while the second contact member 25 comprises an insertion part 25c housed in the tubular part 23c and making sliding contact with its inner surface. The contact members 23 and 25 are energized in directions away from each other by a coil spring 27 housed in the tubular part 23c. The insertion part 25c is equipped with an inclined surface 29b projecting substantially in a conical shape centering on an axis line L. The coil spring 27 has a shape wherein wire is rolled substantially at a certain slope and an end-part winding part 33a projects onto the contiguous insertion part 25c side. Contacting of the winding part 33a with a part of the inclined surface 29b causes component force to act thereon in a direction substantially orthogonal to the axis line L. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a contact pin suitable for an electrical component socket for mounting an electrical component such as a semiconductor device, in particular, contact portions arranged on both ends in the longitudinal direction are urged away from each other by a coil spring. The present invention relates to a contact pin and an electrical component socket using the contact pin.

  Conventionally, as a contact pin used in an electrical component socket for connecting a precision electrical component such as a semiconductor device (hereinafter referred to as an IC package) and a wiring board, a contact portion is provided at both ends in the longitudinal direction, and the space between both contact portions is a cylinder. There is known a structure in which both contact parts are biased in a direction away from each other by a coil spring housed in a cylindrical part while being short-circuited by a cylindrical part.

  In such a contact pin, one contact part is brought into contact with the terminal of the electrical component, and the other contact part is brought into contact with the electrode of the wiring board with contact pressure obtained by the urging force of the coil spring. The electrode of the wiring board and the terminal of the electrical component are electrically connected via the shaped part.

  Although not used for precise applications, a connector in which contact portions at both ends in the longitudinal direction are short-circuited by the cylindrical portion and urged away from each other by a coil spring accommodated in the cylindrical portion is disclosed in the following patent document 1 is proposed.

  In this connector, if the contact state between the insertion portion of one contact member and the tubular portion changes, the electrical resistance changes, which is not preferable. Therefore, the end surface of the insertion portion of one contact member with which the coil spring abuts is inclined. By urging this inclined surface in the axial direction along the longitudinal direction by a coil spring, the insertion portion is urged in the axial direction, and at the same time, the component is urged in the cross direction with respect to the axis. The contact pressure between the part and the cylindrical part is ensured.

Here, the coil spring is formed in a drum shape and the end portion has a small diameter, so that the end portion of the coil spring is deformed and deformed along the inclined surface of the insertion portion, and the wire rod at the end portion becomes cylindrical with the insertion portion. It prevents biting into the gap between the parts.
Japanese Patent No. 3195295

  However, in such a connector, when the coil spring is formed in a drum shape and the end portion of the coil spring is pressed against the inclined surface of the insertion portion, the wire constituting the coil spring on the end side is not provided. It is difficult to obtain the desired urging force with high precision because it deforms and deforms along the inclined surface or buckles. As a result, it is difficult to obtain the desired contact pressure between the insertion portion and the cylindrical portion and the desired contact pressure between the electrode of the wiring board or the terminal of the electrical component and each contact portion, and the resistance of the contact pin There is a problem that the value and the resistance value at each contact portion are likely to vary.

  Therefore, according to the present invention, in the contact pin having such a configuration, a contact pin that can stably suppress the resistance value of the contact pin and can stably suppress the resistance value at each contact portion is provided. It is another object of the present invention to provide a socket for an electrical component that is provided with higher reliability.

  The contact pin according to claim 1, which solves the above-mentioned problem, is electrically connected to the first contact member having a contact portion in electrical contact with the first electrical component at the tip and the second electrical component at the tip. A second contact member having a contact portion to be contacted is disposed along the longitudinal direction, and a coil spring that urges the contact members in a direction to separate the two contact members is disposed between the contact members. A contact pin including a contact portion having a cylindrical conductive wall in which the coil spring is accommodated, and at least one of the contact members is connected to the coil spring. The coil spring is provided with a normal winding portion in which a wire rod is wound with a substantially constant gradient with respect to an axis along the longitudinal direction, and both ends of the normal winding portion. Winding gradient of winding part An end winding portion wound at a higher gradient, and the end winding portion abuts against a part of the inclined surface, whereby the contact member is pressed against the contact member by the biasing force of the coil spring. It is configured such that a force in a direction along the axial direction and a component force in a direction substantially orthogonal to the axial direction act.

  The contact pin according to claim 2 has a first contact member having a contact portion that is in electrical contact with the first electrical component at the tip, and a contact portion that is in electrical contact with the second electrical component at the tip. And the second contact member is disposed along the longitudinal direction. The one contact member is formed with a cylindrical portion extending toward the other contact member, and the other contact member is formed in the cylindrical shape. An insertion portion that is accommodated in the portion and is in sliding contact with the inner surface of the cylindrical portion, and the contact members are biased in a direction to separate the contact portions from each other by a coil spring accommodated in the cylindrical portion. In the contact pin, the insertion portion includes an inclined surface that protrudes in a substantially conical shape centering on an axis along the longitudinal direction, and the coil spring is configured such that the wire is wound with a substantially constant gradient with respect to the axis. Of the normal winding portion and the normal winding portion An end winding portion wound at a gradient higher than the rotational gradient, and the end winding portion abuts against a part of the inclined surface, so that the biasing force of the coil spring causes the insertion portion to Thus, a force in a direction along the axial direction and a component force in a direction substantially orthogonal to the axial direction are configured to act.

  The contact pin according to claim 3 has a first contact member having a contact portion that is in electrical contact with the first electrical component at the tip, and a contact portion that is in electrical contact with the second electrical component at the tip. A second contact member having a tubular portion that is disposed along the longitudinal direction and in which the both contact members are inserted to be movable up and down, and the both contact members are accommodated in the tubular portion and are tubular. Each of the insertion portions is slidably in contact with the inner surface of the portion, and the contact members are urged in a direction in which the contact portions are separated from each other by a coil spring housed in the tubular portion. The portion includes an inclined surface protruding in a substantially conical shape centering on an axis along the longitudinal direction, and the coil spring is wound with a substantially constant gradient with respect to the axis along the longitudinal direction. Normal winding part and winding of the normal winding part An end winding portion wound at a higher gradient than the distribution, and the end winding portion abuts against a part of the inclined surface, so that the biasing force of the coil spring causes the respective insertion portions to A force in a direction along the axial direction and a component force in a direction substantially orthogonal to the axial direction are configured to act.

  According to a fourth aspect of the present invention, in addition to the structure of the second or third aspect, the insertion portion includes a protrusion that protrudes from the inclined surface and can be inserted into the hollow portion of the coil spring. Features.

  According to a fifth aspect of the present invention, in addition to the structure according to any one of the first to fourth aspects of the present invention, the coil spring is configured such that the coil spring is wound from the tightly wound portion around which the wire is tightly wound. The portion has a protruding shape.

  An electrical component socket according to a sixth aspect of the present invention has a socket main body disposed on the wiring board, and the socket main body includes a plurality of contact pins according to any one of the first to fifth aspects. It is characterized by being.

  According to the contact pin of the first aspect, the end winding portion of the coil spring protrudes toward the adjacent contact member, and this end winding portion comes into contact with a part of the inclined surface of the contact portion of the contact member. Since the contact member is urged by the urging force of the coil spring, the contact member can be reliably urged in the axial direction and the direction orthogonal to the axis.

  According to the contact pin of the second or third aspect, the end winding portion of the coil spring protrudes toward the adjacent insertion portion, and this end winding portion is one of the inclined surfaces of the insertion portion accommodated in the cylindrical portion. Since the insertion portion is biased by the biasing force of the coil spring, the insertion portion can be reliably biased in the axial direction and in the direction perpendicular to the axial line.

  At this time, since the inclined surface of the insertion portion protrudes in a substantially conical shape, the protruding side of the inclined surface is inserted into the end winding portion or the end winding portion and the hollow portion of the coil spring to engage the end side of the coil spring. It is possible to stop the position shift. As a result, it is possible to prevent distortion deformation and buckling on the end side of the coil spring, and to keep the resistance value of the contact pin stably low by bringing the insertion portion and the cylindrical portion into contact with each other with a predetermined contact pressure. In addition, the electrode of the wiring board or the terminal of the electrical component and each contact portion can be brought into contact with each other with a predetermined contact pressure, and the resistance value at each contact portion can be stably kept low.

  According to the contact pin of the fourth aspect, since the insertion portion is provided with the protruding portion that protrudes from the inclined surface and can be inserted into the hollow portion of the coil spring, the positional deviation on the end side of the coil spring can be more reliably performed. Can be prevented.

  According to the contact pin of claim 5, since the coil spring has a shape in which the end winding portion protrudes from the tightly wound portion, the end portion of the coil spring before being attached to the contact pin is another coil spring. Is easy to handle.

  According to the electrical component socket of the sixth aspect, the insertion portion and the cylindrical portion which are in slidable contact with each other can be brought into contact with each other with a predetermined contact pressure. Since the electrode or the terminal of the electrical component and each contact portion can be brought into contact with each other with a predetermined contact pressure, the resistance value between the electrode of the wiring board and the terminal of the electrical component can be stably kept low and reliable. A highly reliable socket for electrical parts can be obtained.

[Embodiment 1]

Hereinafter, embodiments will be described with reference to the drawings.
Embodiment 1 of the Invention

  1 to 5 show a first embodiment of the present invention.

  In the figure, reference numeral 10 denotes an IC socket as a socket for an electric component. As shown in FIGS. 1 and 2, the IC package 13 as an electric component is mounted on the wiring board 11 and fixed on the wiring board 11, and wiring is performed. The electrode 12 of the substrate 11 and the solder ball 14 as a terminal of the IC package 13 are configured to be electrically connected. For example, the electrode 12 is used in a test apparatus for the IC package 13 or the like.

  The IC socket 10 includes a socket main body 19 including an adapter member 15 and a base member 17 fixed to the adapter member 15, and is arranged in a matrix on the socket main body 19 so as to penetrate the socket main body 19 in the vertical direction. A number of contact pins 21 are provided. The socket body 19 is positioned on the wiring board 11 by positioning pins 18 in a state where the adapter member 15 and the base member 17 are fixed by the fixing screw 16. Note that a floating plate that can move up and down by placing the IC package 13 is provided on the base member 17, but is not shown in FIGS. 1 and 2.

  In this embodiment, the arrangement pitch of the solder balls 14 of the IC package 13 and the arrangement pitch of the electrodes 12 of the wiring board 11 electrically connected to the solder balls 14 are the same. The pitch is the same as these arrangement pitches. Therefore, each contact pin 21 has a very thin outer shape with a diameter of 0.5 mm or less.

  As shown in FIGS. 3A and 3B, each contact pin 21 has a first contact portion 23 a that is in electrical contact with the electrode 12 of the wiring substrate 11 along the longitudinal axis L. A first plunger 23 as a contact member, a second plunger 25 as a second contact member having a contact portion 25a in electrical contact with the solder ball 14 of the IC package 13 at the tip, the first plunger 23 and the first plunger And a coil spring 27 that urges the two plungers 25 along the axis L in directions away from each other.

  As shown in FIGS. 3 (a) and 3 (b), the first plunger 23 has a substantially cylindrical protruding portion 23b having a contact portion 23a at the tip, and is integrally formed with the protruding portion 23b. It has a cylindrical portion 23c that extends toward the 25th side, has an outer shape larger than the outer shape of the protruding portion 23b, and is a housing portion having a substantially cylindrical conductive wall. The cylindrical portion 23c accommodates a coil spring 27 therein, and has a support portion 23e for the coil spring 27 that is formed in a stepped shape with a reduced diameter at the end on the contact portion 23a side.

  In the first plunger 23, the protruding portion 23 b is slidably inserted into the through hole 15 a of the adapter member 15, and the stepped portion 23 d of the cylindrical portion 23 c comes into contact with the upper surface of the adapter member 15, so that the first plunger 23 moves downward. It is designed to prevent falling out of In the contact state, as shown in FIG. 3A, the contact portion 23 a protrudes downward from the adapter member 15. The opening end side of the cylindrical portion 23 c of the first plunger 23 is slidably inserted into the through hole 17 a of the base member 17.

  As shown in FIGS. 3 (a) and 3 (b), the second plunger 25 slides into a substantially cylindrical protruding portion 25 b having a contact portion 25 a at the tip and a cylindrical portion 23 c of the first plunger 23. A substantially columnar insertion portion 25c accommodated in a possible contact state, and provided between the protruding portion 25b and the inserting portion 25c, larger than the outer shape of the protruding portion 25b, and the cylindrical portion 23c of the first plunger 23 A stopper portion 25d having substantially the same outer shape is integrally provided.

  In the second plunger 25, the insertion portion 25c and the stopper portion 25d are movably accommodated in the through hole 17a of the base member 17, and the stopper portion 25d abuts on the step reduced diameter portion 17b in the through hole 17a. Therefore, the outward movement on the IC package 13 side is restricted. The contact portion 25 a protrudes from the base member 17 and is accommodated in the through hole 20 a of the floating plate 20 that can accommodate the solder ball 14 of the IC package 13.

  In addition, a receiving portion 29 as an abutting portion that abuts and locks the upper end portion of the coil spring 27 is integrally provided at an end portion of the insertion portion 25c of the second plunger 25 on the first plunger 23 side. . The receiving portion 29 is formed to protrude from a peripheral edge 29a arranged in a direction substantially orthogonal to the axis L to the contact portion 23a side on the first plunger 23 side, and has a substantially conical shape centering on the axis L from the peripheral edge 29a. The inclined surface 29b and a columnar portion 29c as a protruding portion that protrudes further from the inclined surface 29b toward the contact portion 23a.

  As shown in FIG. 4, the coil spring 27 has a wire 31a in close contact with both ends of a normal winding portion 31n in which a single wire 31a is wound in a coil shape with a substantially constant gradient with respect to the axis L. The tightly wound portion 31b is formed by winding, and the end winding portions 33a and 33b are formed so as to protrude from the closely wound portion 31b toward the receiving portion 29 or the support portion 23e that are close to each other.

  The end winding parts 33a and 33b are formed in an annular shape continuously from the tightly wound part 31b, and the inner diameter of the annular part is the same as the hollow part 31e of the coil spring 27 including the tightly wound part 31b. . Further, the end winding portions 33a and 33b are inclined obliquely with respect to the axis L, and can be elastically tilted toward the tight winding portion 31b. Note that, at the end winding portion 33a, the wire 31a is wound and protrudes at a higher gradient than the winding gradient of the normal winding portion 31n, and the end winding portion 33b protrudes so as to have a reverse gradient with respect to the end winding portion 33a. ing.

  On the receiving portion 29 side of the coil spring 27, as shown in FIG. 5, the end winding portion 33a is in contact with a part of the inclined surface 29b with the contact pin 21 mounted on the socket body 19. The distal end side of the receiving portion 29, that is, the reduced diameter side of the inclined surface 29b and the cylindrical portion 29c are inserted into the inner diameter of the annular portion of the end winding portion 33a and the hollow portion 31e. Here, the difference between the inner diameter of the annular portion of the end winding portion 33a and the outer diameter of the cylindrical portion 29c needs to be smaller than the difference between the outer diameter of the annular portion and the inner diameter of the cylindrical portion 23c. It is preferable that the difference between the inner diameter of the annular portion of the winding portion 33a and the outer diameter of the cylindrical portion 29c be as small as possible.

  In order to use the IC socket 10 having the contact pins 21 having such a configuration, a large number of contact pins 21 are respectively attached to the socket main body 19, and as shown in FIG. The contact portion 23a is protruded downward, and the contact portion 25a of the second plunger 25 is disposed facing the through hole 20a of the floating plate 20.

  The IC socket 10 is positioned and fixed to the wiring board 11, and the contact portion 23 a of the first plunger 23 is brought into contact with the electrode 12 of the wiring board 11. Thereafter, the IC package 13 is placed on the floating plate 20, and the solder balls 14 are accommodated in the through holes 20a. When the floating plate 20 is lowered in this state, the contact portion 25a of the second plunger 25 comes into contact with the solder ball 14, and when the floating plate 20 is further lowered, as shown in FIG. The coil spring 27 is compressed by the insertion portion 25c of the second plunger 25 in the shaped portion 23c. At this time, as shown in FIG. 5, the end winding portion 33a is elastically tilted, but the entire circumference of the annular portion is not brought into contact with the conical inclined surface 29b, and the end winding portion 33a is not touched. A part of the portion 33a is in contact with a part of the inclined surface 29b.

  As a result, the inclined surface 29b is pressed by the biasing force P1 of the coil spring 27. Then, the component force P2 in the direction along the axis L direction acts on the insertion portion 25c of the second plunger 25 from the end winding portion 33a, and the second plunger 25 is urged in the direction along the axis L. As a result, the contact portion 25a of the second plunger 25 contacts the solder ball 14 with a predetermined contact pressure.

  At the same time, a component force P3 in a direction perpendicular to the axis of the urging force P1 of the coil spring 27 acts on the insertion portion 25c of the second plunger 25 from the end winding portion 33a, and this insertion portion 25c becomes the cylindrical portion 23c. It is urged toward the inner surface. As a result, the insertion portion 25c and the inner surface of the cylindrical portion 23c come into contact with each other with a predetermined contact pressure that allows conduction.

  At this time, also in the first plunger 23, the support portion 23e of the cylindrical portion 23c is urged by the end winding portion 33a of the coil spring 27, and the contact portion 23a of the first plunger 23 is also an electrode of the wiring board 11. 12 is contacted at a predetermined contact pressure.

  In this way, the urging portion 25c of the second plunger 25 is urged toward the cylindrical portion 23c, and the contact portion 23a of the first plunger 23 and the contact portion 25a of the second plunger 25 are attached in a direction away from each other. The IC package 13 can be inspected while being in contact with the electrodes 12 of the wiring board 11 and the solder balls 14 of the IC package 13.

  According to the contact pin 21 as described above, the end winding portion 33 a of the coil spring 27 protrudes toward the insertion portion 25 c of the second plunger 25, and this end winding portion 33 a is the cylindrical portion of the first plunger 23. 23c is in contact with a part of the inclined surface 29b of the insertion portion 25c accommodated in 23c, and the insertion portion 25c is urged by the urging force of the coil spring 27, so that the insertion portion 25c is reliably moved in the direction of the axis L and the axis L. It is possible to bias in a direction orthogonal to the direction.

At that time, since the inclined surface 29b of the insertion portion 25c protrudes in a substantially conical shape, the protruding side of the inclined surface 29b is inserted into the end winding portion 33 and the hollow portion 31e of the coil spring 27 and the end side of the coil spring 27 is inserted. Even if the end winding portion 33 of the coil spring 27 abuts against a part of the inclined surface 29b of the receiving portion 29 and urges it, the end portion side of the coil spring 27 is in relation to the axis L. Therefore, it is possible to prevent a displacement in the intersecting direction.

  In particular, since the cylindrical portion 29c that protrudes from the inclined surface 29b and can be inserted into the hollow portion 31e of the coil spring 27 is provided, it is possible to more reliably prevent the displacement of the end portion side of the coil spring 27.

  As a result, distortion deformation and buckling on the end side of the coil spring 27 can be prevented, and the insertion portion 25c and the cylindrical portion 23c are brought into contact with each other with a predetermined contact pressure, thereby stabilizing the resistance value of the contact pin. At the same time, the electrodes 12 of the wiring board 11 or the solder balls 14 of the IC package 13 and the contact portions 23a and 25a are brought into contact with each other with a predetermined contact pressure, thereby stabilizing the resistance values at the contact portions 23a and 25a. And can be kept low.

  Further, since the coil spring 27 has a shape in which the end winding portion 33 protrudes from the tightly wound portion 31 b, the end portion of the coil spring 27 before being attached to the contact pin 21 is entangled with another coil spring 27. It is easy to handle. Moreover, the end side of the coil spring 27 is difficult to be deformed, and distortion and buckling on the end side can be prevented more reliably.

  According to the IC socket 10 using such contact pins 21, each contact pin 21 can make contact between the insertion portion 25c and the cylindrical portion 23c with a predetermined contact pressure. Since the contact portion 23a, 25a can be brought into contact with the electrode 12 of the IC package 12 or the solder ball 14 of the IC package with a predetermined contact pressure, the resistance value between the electrode 12 of the wiring board 11 and the solder ball 14 of the IC package As a result, a highly reliable IC socket can be obtained.

  The above embodiment can be appropriately changed within the scope of the present invention. For example, in the above embodiment, the cylindrical portion 23c is provided in the first plunger 23 and the insertion portion 25c is provided in the second plunger 25. However, it is also possible to provide the first plunger 23 with a cylindrical portion and the second plunger 25 with a cylindrical portion.

  In the above-described embodiment, the coil spring 27 is shown in which the end winding portions 33a and 33b at both ends protrude. However, the coil spring 27 may be a coil spring provided at one end. .

Furthermore, in the above description, the tightly wound portions 31b are provided on both ends, but a coil spring that does not have the tightly wound portions 31b can be used in the same manner. In that case, the end winding portion 33a may be rolled back with the same gradient as the intermediate portion.
[Embodiment 2 of the Invention]

  FIG. 6 shows a contact pin according to Embodiment 2 of the present invention.

  In the contact pin 41 of the second embodiment, a pair of third plungers 45 disposed at both ends in the axis L direction, instead of the first plunger 23 and the cylindrical portion 23c and the second plunger 25 of the first embodiment, The configuration is the same as that of the first embodiment except that a cylindrical member 43 continuous between the third plungers 45 is used.

  The third plunger 45 includes a protrusion 45b provided with a conical contact portion 45a that contacts the electrode 12 of the wiring board 11 or the solder ball 14 of the IC package 13, and an insertion portion 45c thicker than the protrusion 45b. Yes. The insertion portion 45c is accommodated in the cylindrical member 43 so as to be slidably contacted. The locking portions 43b formed at both ends of the cylindrical member 43 allow the third plunger 45 to move in the protruding direction. Each is regulated.

  A receiving portion 49 for locking the coil spring 27 is integrally provided at the end of the insertion portion 45 c of each third plunger 45. The receiving portion 49 is formed so as to protrude from a peripheral edge 49a disposed in a direction substantially orthogonal to the axis L, has a conical shape centering on the axis L from the peripheral edge 29a, and the surface thereof is an inclined surface 49b. Yes.

  In the receiving portion 49, the end winding portions 33a and 33b of the coil spring 27 are in contact with a part of the inclined surface 49b on the inclined surface 49b in a state where the contact pin 21 is mounted on the socket body 19. The distal end side of the receiving portion 49 is inserted into the inner diameter of the annular portion of the winding portions 33a and 33b.

  In the contact pin 21 having such a configuration, the insertion portion 45c of each third plunger 45 is urged by the coil spring 27 at the receiving portion 49 as in the first embodiment. That is, the inclined surface 49b is pressed by the end winding portions 33a and 33b of the coil spring 27, and each insertion portion 45c is urged in the direction of the axis L and the direction intersecting the axis L.

  According to the contact pin as described above, the protruding side of the inclined surface 49b of the insertion portion 45c is inserted into the end winding portions 33a and 33b of the coil spring 27 for each third plunger. It is possible to prevent the displacement of the end portion side of the spring 27 in the direction intersecting the axis L. As a result, distortion deformation and buckling on the end side of the coil spring 27 are prevented, the insertion portion 45c and the cylindrical member 43 are brought into contact with each other with a predetermined contact pressure, and at the same time, the electrode 12 of the wiring board 11 or the IC package. The 13 solder balls 14 and the contact portions 45a can be brought into contact with each other with a predetermined contact pressure.

It is a top view of IC socket of Embodiment 1 of this invention. It is a side view which shows a part of IC socket of FIG. 1 in a cross section. FIGS. 2A and 2B are enlarged vertical sectional views of contact pins of the IC socket of FIG. 1, in which FIG. 1A shows a state in which an IC package is not mounted, and FIG. The coil spring of the contact pin of FIG. 3 is shown, (a) is a longitudinal cross-sectional view, (b) is a top view of one edge part. FIG. 4 is an enlarged view showing a coil spring of the contact pin of FIG. 3 and the vicinity of a receiving portion thereof. It is a longitudinal cross-sectional view which shows the contact pin of Embodiment 2 of this invention.

Explanation of symbols

10 IC socket (socket for electrical parts)
11 Wiring board 12 Electrode 13 IC package (Electrical component)
14 Solder balls (terminals)
19 Socket body 21 Contact pin 23 First plunger (first contact member)
23a contact portion 23c cylindrical portion 25 second plunger (second contact member)
25a Contact portion 25c Insertion portion 27 Coil spring 29 Receiving portion 29b Inclined surface 31a Wire material 31b Adhering winding portion 33a, 33b End winding portion

Claims (6)

A first contact member having a contact portion that makes electrical contact with the first electrical component at the tip and a second contact member having a contact portion that makes electrical contact with the second electrical component at the tip are longitudinal directions. A coil spring disposed between the contact members and biasing the contact members in a direction to separate the contact members, the first contact member, the second contact member, and the coil In a contact pin comprising a storage portion having a cylindrical conductive wall in which a spring is accommodated,
At least one of the contact members includes an inclined surface protruding in a substantially conical shape at a contact portion with the coil spring,
The coil spring includes a normal winding portion in which the wire is wound with a substantially constant gradient with respect to the axis along the longitudinal direction, and ends wound at higher ends than the winding gradient of the normal winding portion at both ends thereof. With a winding part,
When the end winding portion abuts a part of the inclined surface, the biasing force of the coil spring causes the force in the direction along the axial direction to the contact member and the direction substantially orthogonal to the axial direction. A contact pin that is configured to act with a component force. A first contact member having a contact portion that makes electrical contact with the first electrical component at the tip and a second contact member having a contact portion that makes electrical contact with the second electrical component at the tip are longitudinal directions. The one contact member is formed with a cylindrical portion extending toward the other contact member, and the other contact member is accommodated in the cylindrical portion so that the cylindrical portion In a contact pin that has an insertion portion that is in sliding contact with an inner surface, and wherein both the contact members are urged in a direction to separate the two contact portions from each other by a coil spring housed in the cylindrical portion,
The insertion portion includes an inclined surface protruding in a substantially conical shape centering on an axis along the longitudinal direction,
The coil spring has a normal winding portion in which the wire is wound with a substantially constant gradient with respect to the axis, and an end winding portion wound with a higher gradient than the winding gradient of the normal winding portion. ,
When the end winding portion abuts a part of the inclined surface, the biasing force of the coil spring causes a force in a direction along the axial direction to the insertion portion and a direction substantially orthogonal to the axial direction. A contact pin that is configured to act with a component force. A first contact member having a contact portion that makes electrical contact with the first electrical component at the tip and a second contact member having a contact portion that makes electrical contact with the second electrical component at the tip Each of the contact portions is inserted into the cylindrical portion so that the both contact members are slidably contacted with the inner surface of the cylindrical portion. A contact pin biased in a direction in which the contact members are separated from each other by a coil spring housed in the cylindrical portion;
Each of the insertion portions includes an inclined surface protruding in a substantially conical shape centering on an axis along the longitudinal direction,
The coil spring includes a normal winding portion in which the wire is wound with a substantially constant gradient with respect to the axis along the longitudinal direction, and an end winding portion wound with a higher gradient than the winding gradient of the normal winding portion. And
The end winding portion is in contact with a part of the inclined surface, so that a force in a direction along the axial direction with respect to each insertion portion and a direction substantially orthogonal to the axial direction are applied to each insertion portion by the biasing force of the coil spring. A contact pin that is configured to act with a component force of.   The contact pin according to claim 2, wherein the insertion portion includes a protrusion that protrudes from the inclined surface and can be inserted into a hollow portion of the coil spring.   5. The contact pin according to claim 1, wherein the coil spring has a shape in which the end winding portion protrudes from a tightly wound portion around which the wire is wound in close contact. .   An electrical component socket, comprising: a socket body disposed on a wiring board, wherein the socket body is provided with a plurality of contact pins according to claim 1.

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