JP4857047B2 - Electrical contact, method for forming first contact member of electrical contact, and socket for electrical component - Google Patents

Description

  The present invention relates to an electrical contact that is electrically connected to a first electrical component such as a semiconductor device (hereinafter referred to as an “IC package”), a method for forming a first contact member of the electrical contact, and the electrical contact. The present invention relates to an electrical component socket in which is provided.

  Conventionally, a contact pin as an electrical contact of this type is provided in an IC socket as an electrical component socket (see Patent Document 1). The IC socket is arranged on a wiring board and accommodates an IC package to be inspected. A solder ball that is a spherical terminal of the IC package and an electrode of the wiring board are Electrical connection is made through contact pins.

The contact pin has a plunger, and a contact portion that is brought into contact with the solder ball is formed at the tip of the plunger. The plunger is formed in a cylindrical shape by cutting a conductive material, and the contact portion has a crown shape (crown shape), and this shape is also formed by cutting.
JP 2002-357622 A

  However, in such a conventional apparatus, since the plunger is formed by cutting, the formation is difficult, expensive, and heavy. In addition, there is a problem that the sliding resistance is increased when the plunger moves up and down because a tear is generated around the plunger. Furthermore, since the contact portion formed at one end of the rod-shaped plunger is formed into a crown shape by cutting with a cutter to form a plurality of chevron portions, the molding is difficult and expensive. .

  Accordingly, the present invention is an electric contact that is easy to form, is inexpensive, is lightweight, and can be easily reduced in sliding resistance, and a method for forming a first contact member of the electric contact and an electric component It is an issue to provide a socket for the use.

In order to achieve this object, the invention according to claim 1 has a first contact member in which a plate material is formed in a cylindrical shape, and contacts the first electrical component at the tip of the first contact member. The first contact portion is formed with a plurality of contact pieces projecting upward, and the plurality of contact pieces are respectively arranged in the upper and lower directions. The bent end surface portion of the contact piece is bent inward from a folding line inclined with respect to the direction, and inclined with respect to the horizontal direction so as to become lower from the cylindrical peripheral side toward the center side. And it is set as the electrical contactor comprised so that the terminal of the said 1st electrical component might be contacted .

According to a second aspect of the present invention, in addition to the configuration according to the first aspect , the contact piece is formed of three or more pieces, and an end surface portion of each contact piece is substantially in a radial direction with respect to the cylindrical center. It is characterized by being formed.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect , the first contact member, a second contact member having a second contact portion that is in contact with a second electrical component, And urging means for urging both the first and second contact members in opposite directions.

The invention according to claim 4 is a method of forming the first contact member of the electric contact according to claim 1 or 2 , wherein a sheet of conductive plate material is punched into a substantially rectangular shape, and the tip portion A plurality of notches are formed obliquely, and a plurality of projecting pieces that form the contact pieces are formed obliquely, and each projecting piece is bent in the same direction from a folding line that is inclined with respect to the vertical direction, and then substantially rectangular. The first contact member forming method of the electrical contact formed by bending the plate material into a cylindrical shape with the side where the protruding pieces are bent as the inner side is used.

The invention of claim 5 includes a socket body in which the first electrical component is accommodated, is arranged in the socket body, one of claims 1 to 3 is brought into contact with the terminal of the first electrical component An electrical component socket having the electrical contact according to claim 1 is provided.

  According to the first aspect of the present invention, the first contact member of the electric contactor is formed into a cylindrical shape by bending the plate material, and therefore is not formed by cutting unlike the conventional case. , Easy to mold, inexpensive, and light weight.

  Moreover, since these 1st contact members are not formed by cutting, since the tear by cutting does not generate | occur | produce on a surrounding surface, the sliding resistance at the time of the up-and-down movement of these 1st contact members can be made small.

  Furthermore, since the first contact portion is also formed by bending a plurality of contact pieces inward, it can be easily formed at a lower cost than a conventional contact portion formed by cutting.

Moreover , since the end surface portion of the contact piece is brought into contact with the electrical component terminal, the electrical conductivity can be improved by contacting the electrical component terminal with the end surface portion having a narrow width.

Furthermore , since the end surface portion is inclined with respect to the horizontal direction so as to become lower from the cylindrical peripheral side toward the center side, when the terminal is spherical, the end surface portion is the outermost end of the spherical terminal. Without contacting the lower end, damage to the lowermost end of the terminal can be prevented.

According to the second aspect of the present invention, three or more contact pieces are formed, and the end surface portion of each contact piece is formed along the substantially radial direction with respect to the cylindrical center. When the terminal is spherical, it can be guided to the center of the cylinder.

According to invention of Claim 4 , the contact piece of the 1st contact part of a 1st contact member can be easily shape | molded by stamping and a bending process.

According to the invention described in claim 5 , a socket body in which the first electrical component is accommodated, and the plurality of electrical contacts according to any one of claims 1 to 3 disposed in the socket body. Therefore, the electrical component socket having the above-described effects can be provided.

Embodiments of the present invention will be described below.
Embodiment 1 of the Invention

  1 to 8 show a first embodiment of the present invention.

  First, the configuration will be described. Reference numeral 11 in the figure denotes an IC socket as an “electrical component socket”. By accommodating an IC package 12 as a “first electric component” in the IC socket 11, the IC package 12 And the wiring board 13 which is the “second electrical component” are electrically connected via the IC socket 11.

  This IC package 12 is a so-called BGA (Ball Grid Array) type, and a large number of substantially spherical solder balls 12a as “terminals” are arranged in rows and columns on the lower surface of a rectangular package body 12b. Are arranged in a shape.

  The IC socket 11 has a socket body 14 that is mounted on a wiring board 13, and a plurality of contact pins 15 that are “electrical contacts” are disposed on the socket body 14.

  As shown in FIG. 2, the socket body 14 is held by inserting the contact pins 15 into the holding holes 18a and 19a of the upper holding member 18 and the lower holding member 19 which are attached to each other by bolts not shown. Yes.

  Further, the floating plate 20 is arranged on the upper side of the upper holding member 18 so as to be movable up and down by a guide pin (not shown) and stopped at a predetermined height, and is biased upward by a spring (not shown). Has been.

  The upper side of the contact pin 15 is inserted into the insertion hole 20 a of the floating plate 20.

  The contact pin 15 includes a first contact member 26 electrically connected to the IC package 12, a second contact member 27 electrically connected to the wiring board 13, the first contact member 26 and the second contact member 26. It comprises a coil spring 28 as “biasing means” for urging the contact member 27 in opposite directions.

  In the first contact member 26, a conductive plate is formed into a cylindrical shape by bending, and a crown-shaped (crown-shaped) first contact portion 26a that is in contact with the solder ball 12a is formed at the upper end portion. A bulging portion 26b having a diameter larger than that of other portions is formed in an intermediate portion (vertical direction).

  A plurality (three in this case) of contact pieces 26e are formed on the first contact portion 26a by bending inward, so that these contact pieces 26e come into contact with the solder balls 12a of the IC package 12. It is configured.

  More specifically, as shown in FIGS. 6 and 7, etc., these contact pieces 26e have a substantially triangular shape, and are formed so as to be inclined obliquely so that one end surface portion 26f is positioned higher than the other end surface portion 26g. Then, the upper end surface portion 26 f is in contact with the solder ball 12 a of the IC package 12. The end face portion 26f is inclined with respect to the horizontal direction so as to become lower (the tip is lowered) from the cylindrical peripheral side toward the center side.

  The first contact member 26 has a protrusion 26c having a smaller diameter than the other part at the end (lower end) inserted into the second contact member 27, and a coil spring 28 is formed on the protrusion 26c. Is fitted.

  On the other hand, the second contact member 27 has a conductive plate material formed into a cylindrical shape by bending, a large-diameter cylindrical portion 27a is formed on the upper side, and a small-diameter cylindrical portion 27b is formed on the lower side. The upper end portion (end portion) of the diameter tube portion 27a is opened to form an opening portion, and the first contact member 26 is inserted from above through the opening portion, and the protruding portion 26c of the first contact member 26, A coil spring 28 is interposed between the large diameter cylindrical portion 27a of the second contact member 27 and the stepped portion 27c of the small diameter cylindrical portion 27b, and is biased in a direction away from each other.

  In addition, a crown-shaped second contact portion 27 d that contacts the electrode portion 13 a of the wiring substrate 13 is formed at the lower end portion of the small diameter cylindrical portion 27 b.

  The holding hole 18a of the upper holding member 18 of the socket body 14 is formed with a small diameter hole 18b on the upper side and a large diameter hole 18c on the lower side, and the first contact member 26 in the large diameter hole 18c. The bulging portion 26b is inserted, and the bulging portion 26b comes into contact with the stepped portion 18d between the small-diameter hole portion 18b and the large-diameter hole portion 18c, so that the rising of the first contact member 26 stops. And is configured to be retained.

  Further, the second contact member 27 is configured such that in the lowest lowered state, the stepped portion 27c abuts on the upper surface of the lower holding member 19 and the lowering is stopped to prevent it from coming off.

  On the other hand, in the socket body 14, an opening / closing member 31 is rotatably disposed by a rotation shaft 32, and the opening / closing member 31 is biased in a direction to be opened by a spring (not shown). A pressing member 33 that presses the IC package 12 is disposed on the opening / closing member 31 so as to be movable up and down in the closed state shown in FIG. 1 and is urged downward by a spring 34.

  The socket body 14 is provided with a hook member 35 that is engaged with and disengaged from a locking portion formed at the tip of the opening / closing member 31 so as to be rotatable by a shaft 36. The closed state can be maintained.

  Next, a method for manufacturing the contact pin 15 will be described.

  First, in order to manufacture the first contact member 26 of the contact pin 15, a single flat plate having conductivity is punched into a substantially rectangular shape. At this time, as shown in FIG. 8, a plurality of cuts are made to form a total of three projecting pieces 26i to be contact pieces 26e. The direction in which this incision is made and the direction in which the whole is punched out are punched in directions opposite to each other.

Thereafter, bent in the same direction as shown in (a) in the position shown in two-dot chain line A from (folding line inclined to the vertical direction) in FIG. 8 the projecting pieces 26i (b) of FIG. 8, then The first contact member 26 is formed by bending (curling) the substantially rectangular plate material into a cylindrical shape with the side where each protruding piece 26 i is bent as the inside.

In order to manufacture the second contact member 27, similarly to the first contact member 26, a conductive flat plate material is punched into a substantially rectangular shape and formed into a chevron shape corresponding to the crown-shaped second contact portion 27d. In addition, a portion corresponding to the stepped portion 27c is formed.

  Next, the punched plate material is bent (curled) to form a cylindrical shape, whereby the second contact member 27 is formed.

  The coil spring 28 is accommodated in the large-diameter cylindrical portion 27a of the second contact member 27 thus molded, and the first contact member 26 is inserted into the large-diameter cylindrical portion 27a of the second contact member 27. Thus, the assembly of the contact pin 15 is completed.

  The contact pin 15 thus formed is inserted and held in the holding holes 18 a and 19 a of the upper holding member 18 and the lower holding member 19 of the socket body 14.

  Next, the operation will be described.

  First, the case where the IC package 12 is accommodated will be described. By previously placing the IC socket 11 on the wiring board 13, the second contact member 27 of the contact pin 15 is brought into contact with the electrode portion 13 a of the wiring board 13. As a result, the second contact member 27 of the contact pin 15 projecting downward from the socket body 14 is pushed by the wiring board 13 and pushed into the socket body 11 (see FIG. 4).

  Then, with the opening / closing member 31 open, the IC package 12 is conveyed by an automatic machine or the like and accommodated on the floating plate 20. At this time, the IC package 12 is placed at a predetermined position on the floating plate 20, and the solder balls 12 a are inserted into the insertion holes 20 a of the floating plate 20 as shown in FIG. 4.

  From this state, the opening / closing member 31 is closed, and the hook member 35 is engaged with the opening / closing member 31, whereby the IC package 12 is pressed downward by the pressing member 33 of the opening / closing member 31. Then, the floating plate 20 is lowered against the urging force of the spring, the solder ball 12a comes into contact with the first contact portion 26a of the first contact member 26 of the contact pin 15, and the first contact member 26 faces downward. Thus, the coil spring 28 is displaced against the urging force (see FIG. 3). At this time, the solder balls 12a of the IC package 12 come into contact with the end face portions 26f on the three sides.

  As a result, the contact pin 15 is compressed against the urging force of the coil spring 28, so that the reaction force causes the first contact portion 26a to be applied to the solder ball 12a of the IC package 12 and the second contact portion 27d. Are brought into contact with the electrode portion 13a of the wiring board 13 with the same predetermined contact pressure.

  As a result, the IC package 12 and the wiring substrate 13 are electrically connected via the contact pins 15, and a burn-in test or the like is performed.

  In such a case, the first contact member 26 having the first contact portion 26a having a crown shape is formed into a cylindrical shape by bending a plate material. Therefore, the crown-shaped first contact member 26 can be easily, inexpensively, and lightly weighted. Since many contact pins 15 are arranged in one IC socket 11, if one contact pin 15 can be reduced in weight, the IC socket 11 as a whole can be significantly reduced in weight. Accordingly, it is possible to reduce the burden on the wiring board 13 on which a large number of IC sockets 11 are arranged.

  In addition, since the end surface portion 26f of each contact piece 26e is in contact with the solder ball 12a, the conductivity can be improved by contacting the solder ball 12a with the narrow end surface portion 26f. .

  Further, in the first embodiment, three contact pieces 26e are formed, and the three end surface portions 26f provided at substantially equal intervals come into contact with the solder ball 12a, and each end surface portion 26f has a center side positioned downward. Thus, the solder ball 12a can be guided around the center.

Furthermore, since the end surface portion 26f is inclined with respect to the horizontal direction so as to become lower from the cylindrical peripheral side toward the center side, the solder ball 12a does not contact the lowest end of the solder ball 12a. It is possible to prevent damage at the lowermost end of the.
[Embodiment 2 of the Invention]

  FIG. 9 shows a second embodiment of the present invention.

  In the first embodiment, three contact pieces 26e of the first contact member 26 are formed, but in the second embodiment, four contact pieces 26e are formed.

  FIG. 9A shows a state in which the plate material has been punched out, and a plurality of protrusions 26i are formed by forming a plurality of cuts. From this state, the first contact member 26 is formed by bending the projecting piece 26i as shown in FIG. 9B and further bending the whole into a cylindrical shape.

  Even if it does in this way, the effect similar to Embodiment 1 will be acquired. Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted.

  In the above embodiment, the contact pin 15 that is an “electrical contact” is applied to the IC socket 11, but the present invention is not limited to this, and can be applied to other types.

  In addition, the socket for electrical parts of the present invention can be applied to a so-called open top type IC socket or a socket provided with a pusher for pressing the electrical parts on the automatic machine side.

  Further, in this embodiment, the contact pin 15 is composed of three parts, that is, the first contact member 26, the second contact member 27, and the coil spring 28. 26 may be provided, and the bulging portion 26b and the protrusion 26c of the first contact member 26 are not necessarily required.

It is the side view which carried out the cross section of the left half of the IC socket which concerns on Embodiment 1 of this invention. It is an expanded sectional view which shows the contact pin arrangement | positioning part of IC socket which shows the state before IC package accommodation based on the Embodiment 1. FIG. It is an expanded sectional view which shows the contact pin arrangement | positioning part of IC socket which shows the IC package accommodation state which concerns on the same Embodiment 1. FIG. It is an expanded sectional view which shows the socket main body and the contact pin in the contact pin arrangement | positioning part of the IC socket which concerns on the same Embodiment 1. FIG. It is a front view which shows the 1st contact member of the contact pin of the IC socket which concerns on the same Embodiment 1. FIG. It is a perspective view which shows the 1st contact part of the 1st contact member of the contact pin of the IC socket which concerns on the same Embodiment 1. FIG. It is a top view which shows the 1st contact part of the 1st contact member of the contact pin of the IC socket which concerns on the same Embodiment 1. FIG. It is a figure which shows the 1st contact part of the 1st contact member of the contact pin of the IC socket which concerns on the same Embodiment 1, (a) is an expanded view, (b) is a side view which shows the state which bent the protrusion. is there. It is a figure which shows the 1st contact part of the 1st contact member of the contact pin of the IC socket which concerns on Embodiment 2 of this invention, (a) is an expanded view, (b) is the side surface which shows the state which bent the protrusion. FIG.

Explanation of symbols

11 IC socket (socket for electrical parts)
12 IC package ( first electrical component)
12a Solder ball (terminal)
12b Package body
13 Wiring board (second electrical component)
13a Electrode section
14 Socket body
15 Contact pin (electric contact)
18 Upper holding member
19 Lower holding member
20 Floating plate
26 First contact member
26a First contact part
26b bulge
26c protrusion
26e contact piece
26f, 26g end face
26i protrusion
27 Second contact member
27a Large diameter tube
27b Small diameter cylinder
27c Step
27d Second contact part
28 Coil spring (biasing means)

Claims (5)

The plate member has a first contact member formed in a cylindrical shape, and a first contact portion that is in contact with and electrically connected to the first electrical component is formed at the tip of the first contact member. In the contact,
The first contact portion is formed with a plurality of contact pieces projecting upward, and each of the plurality of contact pieces is bent inward from a folding line inclined with respect to the vertical direction,
The bent end surface portion of the contact piece is inclined with respect to the horizontal direction so as to become lower from the cylindrical peripheral side toward the center side, and is configured to be in contact with the terminal of the first electrical component. electrical contacts, characterized in that it is. The electrical contact according to claim 1, wherein the contact pieces are formed in three or more pieces, and an end surface portion of each contact piece is formed along a substantially radial direction with respect to a cylindrical center. . A first contact member; a second contact member having a second contact portion that is in contact with a second electrical component; and biasing means for biasing the first and second contact members in opposite directions. electrical contactor according to claim 1 or 2, characterized in that it has. A method for forming a first contact member of an electric contact according to claim 1 or 2,
A sheet of conductive material is punched into a substantially rectangular shape, and a plurality of cuts are formed obliquely at the tip, and a plurality of protrusions that form the contact pieces are formed obliquely. The electric contact is formed by bending in the same direction from a fold curve inclined with respect to the plate, and then bending the substantially rectangular plate material into a cylindrical shape with the side where each protruding piece is bent as an inner side. A method for forming a first contact member of a child . A socket body in which the first electrical component is accommodated;
An electrical component socket, comprising: the electrical contact according to any one of claims 1 to 3, wherein the electrical contact is disposed on the socket body and is in contact with a terminal of the first electrical component .

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