JP5698030B2 - Contact pin and socket for electrical parts - Google Patents

Description

  The present invention includes a contact pin for electrically connecting a first electrical component and a second electrical component, and a semiconductor device (hereinafter referred to as an “IC package”) provided with these contact pins and disposed on a wiring board. The present invention relates to a socket for an electrical component that accommodates the electrical component in order to perform a test of the electrical component.

  Conventionally, this type of “socket for electrical components” includes an IC socket 2 that detachably accommodates an IC package 1 that is an “electrical component” (see FIG. 8). FIG. 8 shows a part of the IC socket 2.

  The IC package 1 has, for example, a rectangular package body 1a, and a spherical terminal 1b protrudes from the package body 1a.

  On the other hand, the IC socket 2 has a socket body 3 disposed on the wiring board P, and the socket body 3 has a plurality of contact pins for electrically connecting the IC package spherical terminal 1b and the wiring board P. A contact pin unit 5 provided with 4 is provided.

  The contact pin 4 includes a first contact member 7 made of a conductive material in contact with the wiring board P, a second contact member 8 made of a conductive material in contact with the IC package spherical terminal 1b, and the first contact member 4 And a coil spring 9 made of a conductive material that urges the contact member 7 and the second contact member 8 in a separating direction.

  The first contact member 7 is formed at an insertion rod portion 7a inserted into the coil spring 9, a contact portion 7b contacted with the wiring board P, and a proximal end portion of the insertion rod portion 7a. And a step portion 7c that supports (abuts) the end portion of the.

  A floating plate 6 is disposed in the socket body 3 so as to be movable up and down while being biased upward by a spring (not shown), and the IC package 1 is accommodated on the floating plate 6. .

  When the IC socket 2 is disposed on the wiring board P and used, the IC package 1 is accommodated on the floating plate 6 and the IC package 1 is pressed from above, so that FIG. As shown, the floating plate 6 is lowered.

  Then, the second contact member 8 of the contact pin 8 is pressed against the spherical terminal 1b of the IC package 1, the coil spring 9 is compressed, and the first contact member 8 of the contact pin 8 is pressed against the wiring board P. It becomes.

  At this time, the coil spring 9 is compressed to buckle (bend) in the lateral direction in the figure, and the coil spring 9 is brought into contact with the insertion rod portion 7 a of the first contact member 7.

  Thus, the current flows from the upper end of the IC package spherical terminal 1b, the second contact member 8, and the coil spring 9 to the contact portion (short-circuit portion) between the coil spring 9 and the insertion rod portion 7a of the first contact member 7. Between the coil spring 9 and the contact portion (short-circuit portion) of the insertion rod portion 7 a of the first contact member 8, it flows between the lower end portion of the first contact member 8 and the wiring board P.

  In this state, a current is passed from the wiring board P side to the IC package 1 via the contact pins 4 to perform a burn-in test or the like.

  In addition, as this kind of thing, there exists a thing as described in patent document 1, for example.

Japanese Patent Application Laid-Open No. 2005-222912.

  However, in such a conventional device, the first contact member 7 having the insertion rod portion 7a of the contact pin 4 has a diameter of 0. 0. It is extremely thin, a few millimeters, and it is very difficult to manufacture by cutting, resulting in an increase in cost. Further, the contact portion (short-circuit portion) due to the buckling of the insertion rod portion 7a of the first contact member 7 and the coil spring 9 depends on the method of buckling (bending) of the coil spring 9, and this buckling method. Since it varies depending on the operation, the short-circuit position varies, so that the resistance value may become unstable.

  Accordingly, an object of the present invention is to provide a contact pin and an electrical component socket that can be easily molded and can stabilize a resistance value.

In order to achieve the above object, the present invention provides a contact pin for electrically connecting a first electrical component disposed on one end side and a second electrical component disposed on the other end side. A first contact member made of a conductive material in contact with one electrical component; a second contact member made of a conductive material in contact with the second electrical component; the first contact member and the second contact member. A coil spring made of a conductive material that urges the contact member in a separating direction, and the first contact member is formed by press punching and inserted into the coil spring; and A contact portion that is in contact with the first electrical component; and a step portion that is formed at a proximal end portion of the insertion rod portion and abuts on the end portion of the coil spring. One side centered on the axis of the contact member Position of the square side, are formed at different positions in the axial direction, said the first contact member and the second contact member is compressed in a direction coming close against the urging force of the coil spring When the end portion of the coil spring comes into contact with the stepped portion, the first contact member is inclined, and due to this inclination, the insertion rod portion is brought into contact with the inside of the coil spring, and is conducted. The contact pin is configured such that a conduction path in the order of the first contact member, the coil spring, and the second contact member is formed between the first electrical component and the second electrical component . It is characterized by that.

  Another feature is that each corner of the rectangular cross-sectional shape of the insertion bar is formed in an R shape.

  Another feature is that the insertion rod portion is formed to be inclined with respect to the axis.

  Another feature is that the insertion rod portion is formed such that the distal end side is wider than the proximal end side.

  The contact pin according to any one of claims 1 to 4, wherein another feature is that the socket body is disposed on the wiring board as the first electrical component and accommodates the second electrical component. A plurality of sockets for electric parts are provided.

  According to this invention, since the buckling position of the coil spring can be always constant by changing the position between the one side and the other side of the stepped portion of the first contact member, the conduction path can be made constant. The resistance value can be stabilized.

  In addition, since the first contact member of the contact pin is formed by pressing, it can be easily formed as compared with a case where the first contact member is formed by conventional cutting. In addition, even when forming the one side and the other side where the positions of the stepped portions are different, since they are press working, they can be easily formed as compared with cutting and the like.

  According to another feature, each corner portion of the insertion rod portion of the first contact member can be formed in an R shape so that it can approach a circle slightly smaller than the inner circumference of the coil spring.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view of an IC socket according to an embodiment of the present invention, in which FIG. It is a figure which shows the state which carried out. It is a figure which shows the 1st contact member of the contact pin which concerns on the embodiment, (a) is a front view, (b) is sectional drawing which follows the AA line of (a), (c) is a bottom view. is there. It is a side view of the 1st contact member of the contact pin concerning the embodiment. It is a figure which shows the state which forms the corner | angular part of the insertion rod part of the 1st contact member of the contact pin which concerns on the embodiment in R shape. It is a front view which shows the modification of the 1st contact member of the contact pin which concerns on the embodiment. It is a front view which shows the other modification of the 1st contact member of the contact pin which concerns on the embodiment. It is a front view which shows the further another modification of the 1st contact member of the contact pin which concerns on the embodiment. It is a figure which shows a prior art example, (a) is sectional drawing equivalent to (a) of FIG. 1, (b) is sectional drawing equivalent to (b) of FIG.

  Embodiments of the present invention will be described below.

  1 to 4 show an embodiment of the present invention.

  First, the configuration will be described. Reference numeral 11 in FIG. 1 denotes an IC socket as a “socket for electrical parts”. The IC socket 11 is arranged on the wiring board P which is a “first electrical part”. In order to perform a burn-in test or the like of the IC package 12 that is the “second electrical component”, the electrical connection between the spherical terminal 12 b as the “terminal” of the IC package 12 and its wiring board P Is intended.

  As shown in FIG. 1, the IC package 12 has a rectangular package body 12a in plan view, and a plurality of spherical terminals 12b as "terminals" are formed in a matrix shape on the lower surface of the package body 12a. ing.

  On the other hand, as shown in FIG. 1 and the like, the IC socket 11 is fixed on the wiring board P, is provided with a socket main body 14 in which the IC package 12 is accommodated, and the socket main body 14 is openable and closable. A cover member (not shown) that is pressed and a lock mechanism (not shown) that locks when the cover member is closed are provided.

  More specifically, the socket body 14 is made of a synthetic resin having a plurality of contact pins 18 and having an insulating property, and an IC package 12 is provided on the upper side of the contact pin unit 15. And a floating plate 16 to be accommodated.

  The contact pin unit 15 includes a first plate 19, a second plate 20, a third plate 21, and a fourth plate 22, which are arranged in order from the bottom, and each of the plates 19 to 22 has a contact pin. Through holes 19a to 22a for accommodating 18 are formed.

  The diameters of the through holes 20a and the through holes 21a of the second plate 20 and the third plate 21 are smaller than the diameters of the through holes 19a and the through holes 22a of the first plate 19 and the fourth plate 22, and are accommodated. The contact pin 18 does not come out.

  Further, as shown in FIG. 1 and the like, the contact pin 18 includes a wiring board P that is a “first electrical component” disposed on one end side and a “second electrical component” disposed on the other end side. An IC package 12 is electrically connected.

  The contact pin 18 includes a first contact member 23 made of a conductive material in contact with the wiring board P, a second contact member 24 made of a conductive material in contact with the IC package 12, and a first contact member. 23 and a coil spring 25 made of a conductive material that urges the second contact member 24 and the second contact member 24 in a separating direction.

  The first contact member 23 is formed by press punching, and includes an insertion rod portion 23a inserted into the coil spring 25, a contact portion 23b contacted with the wiring board P, and a proximal end portion of the insertion rod portion 23 ( And a step part 23c that is in contact with one end of the coil spring 25. The step part 23c is formed between the insertion bar part 23 and the contact part 23b.

  As shown in FIG. 2 and the like, the step portion 23c is formed at a position where the positions of the one side 23d and the other side 23e around the axis O of the first contact member 23 are different in the direction of the axis O. Then, the position of the other side 23e is higher than the one side 23d.

  Since the insertion bar portion 23a of the first contact member 23 is formed by press punching, the cross-section has a square shape as it is, but as shown in the enlarged view of FIG. By striking each corner 23f, each corner 23f having a square cross-sectional shape is formed in an R shape. As a result, the insertion rod portion 23 a is arranged with a slight gap from the inner peripheral surface of the coil spring 25. Of course, the corners of the contact portion 23b and the step portion 23c of the first contact member 23 are also formed in an R shape.

  The step portion 23 c of the first contact member 23 is disposed in the through hole 20 a of the second plate 20, and the contact portion 23 b is inserted into the through hole 19 a of the first plate 19.

  Further, the second contact member 24 is formed by cutting and includes a large-diameter portion 24a formed on the lower side, and a contact portion 24b having a smaller diameter than the large-diameter portion 24a and extending upward. Yes.

  The second contact member 24 has a large-diameter portion 24 a disposed in the large-diameter through hole 21 a of the third plate 21, and the contact portion 24 b includes the through-hole 22 a of the fourth plate 22 and the through-hole of the floating plate 16. The upper end portion 24c is brought into contact with and electrically connected to the spherical terminal 12b of the IC package 12.

  The coil spring 25 is made of a conductive metal material, and has a stepped portion 23c of the first contact member 23 and a large diameter portion of the second contact member 24 in the second and third plates 20 and 21. 24a.

  Next, how to use the IC socket 11 will be described.

  First, in a state before the IC socket 11 is disposed on the wiring board P (for example, during transportation), the first contact member 23 is urged by a coil spring 25 as shown in FIG. Thus, the contact portion 23b of the first contact member 23 protrudes downward.

  From this state, when the IC socket 11 is placed on the wiring board P, the contact portion 23b of the first contact member 23 comes into contact with the wiring board P as shown in FIG. It is pushed upward by the urging force.

  When the IC package 12 is housed on the floating plate 16 and is pushed downward by an urging force of a spring (not shown) by an automatic machine or the like, the spherical terminal 12 b of the IC package 12 is moved to the second contact member 24. The floating plate 16 abuts on the fourth plate 22 in contact with the upper end 24 c of the contact portion 24 b, and the second contact member 24 is pushed downward against the urging force of the coil spring 25.

  As a result, the IC package 12 and the wiring board P are electrically connected via the contact pins 18, and a burn-in test or the like of the IC package 12 is performed.

  At the time of electrical connection using the contact pin 18, as shown in FIG. 1 (b), the height of the one side 23 d and the other side 23 e of the contact pin 18 is different and inclined, so that the coil spring 25 will always buckle in the left direction in FIG.

  Thereby, the front end side (upper end side) of the insertion rod portion 23a of the first contact member 23 is in contact with and electrically connected to the inner peripheral surface of the coil spring 25 on the right side in FIG. Thus, the electrical conduction path from the IC package 12 to the wiring board P is such that the IC package spherical terminal 12b, the second contact member 24, and the coil spring 25 and the first contact member 24 are inserted from the upper end of the coil spring 25. The coil spring 25 between the contact portion (short-circuit portion S) with the upper end of the rod portion 23a, the contact portion 23b of the first contact member 23 from the contact portion (short-circuit portion S) of the first contact member 23, A current flows between the wiring boards P.

  In such a case, the buckling position of the coil spring 25 can always be made constant by changing the height of the one side 23d and the other side 23e of the step portion 23c of the first contact member 23. Since the conduction path can be made constant, the resistance value can be stabilized.

  In addition, since the first contact member 23 of the contact pin 4 is formed by press working, it can be easily formed as compared with a case where the first contact member 23 is formed by conventional cutting. Moreover, even when the one side 23d and the other side 23e having different heights of the stepped portion 23c are formed, since they are press working, they can be easily formed as compared with cutting and the like.

Further, by forming the corner portion 23f of the insertion rod portion 23a of the first contact member 23 into an R shape having a curvature substantially equal to the inner diameter of the coil spring 25, a circular shape slightly smaller than the inner circumferential circle of the coil spring 25. Can be approached.
[Modification]

  5 to 7 show different modifications of this embodiment.

  In the modification shown in FIG. 5, the insertion rod portion 23a of the first contact member 23 is inclined to the right with respect to the axis O in the drawing. For this reason, when the coil spring 25 is buckled, the distal end portion of the insertion rod portion 23a is more likely to come into contact with the coil spring 25.

  In the modification shown in FIG. 6, the width of the insertion rod portion 23a of the first contact member 23 gradually increases toward the distal end side, and the width on the distal end side is formed wider than the width on the proximal end side. For this reason, when the coil spring 25 is buckled, the distal end portion of the insertion rod portion 23a is more likely to come into contact with the coil spring 25, and the resistance value can be stabilized.

  In the modification shown in FIG. 7, the width of the distal end side of the insertion rod portion 23a of the first contact member 23 is suddenly wider than the width of the proximal end side. For this reason, when the coil spring 25 is buckled, the distal end portion of the insertion rod portion 23a is more likely to come into contact with the coil spring 25, and the resistance value can be stabilized.

  Since other configurations of these modified examples are the same as those of the above-described embodiment, a duplicate description is omitted.

  In the above-described embodiment, the contact pin 18 of the present invention is applied to the IC socket 11. However, the present invention is not limited to this and can be applied to other devices. Further, although the present invention is applied to the IC socket 11 as the “electrical component socket”, it is needless to say that the present invention is not limited to this and can be applied to other devices. Moreover, in the said embodiment, although the 1st contact member 23 is formed by press work, of course, not only this but the 2nd contact member 24 may also be pressed.

11 IC socket (socket for electrical parts)
12 IC package (electrical parts)
12b Spherical terminal (terminal)
14 Socket body
15 Contact pin unit
16 Floating plate
18 Contact pin
23 First contact member
23a Insertion bar
23b Contact area
23c Step
23d one side
23e The other side
23f Corner
24 Second contact member
25 Coil spring
P Wiring board

Claims (5)

In the contact pin that electrically connects the first electrical component disposed on one end side and the second electrical component disposed on the other end side,
A first contact member made of a conductive material in contact with the first electrical component;
A second contact member made of a conductive material in contact with the second electrical component;
A coil spring made of a conductive material that urges the first contact member and the second contact member in a direction of separating the first contact member and the second contact member;
The first contact member is formed by press punching, and is provided at an insertion rod portion inserted into the coil spring, a contact portion in contact with the first electric component, and a proximal end portion of the insertion rod portion. Formed, and having a stepped portion that contacts the end of the coil spring,
The step portion is formed at a position where one side and the other side around the axis of the first contact member are different in the axial direction ,
When the first contact member and the second contact member are compressed in a direction approaching against the biasing force of the coil spring, the end portion of the coil spring comes into contact with the stepped portion. Accordingly, the first contact member is tilted, and due to this tilt, the insertion rod portion is brought into contact with the inside of the coil spring and is conducted,
A conduction path in the order of the first contact member, the coil spring, and the second contact member is formed between the first electrical component and the second electrical component. Contact pin. 2. The contact pin according to claim 1, wherein each of the insertion bar portions is formed in an R shape at each corner of a square cross-sectional shape. The contact pin according to claim 1, wherein the insertion rod portion is formed to be inclined with respect to the axis. The contact pin according to any one of claims 1 to 3, wherein the insertion rod portion has a width on the distal end side wider than a width on the proximal end side. A plurality of contact pins according to any one of claims 1 to 4, wherein a plurality of contact pins are disposed on a socket body that is disposed on a wiring board that is the first electrical component and accommodates the second electrical component. A socket for electrical parts characterized by the above.

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