JP4838522B2 - Electrical contact and socket for electrical parts - Google Patents

Description

  The present invention provides an electrical contact that electrically connects a first electrical component such as a semiconductor device (hereinafter referred to as an “IC package”) and a second electrical component such as a wiring board, and the electrical contact is disposed. It is related with the socket for electrical components made.

  Conventionally, as this kind of electric contact, there is one as shown in FIG. 5, for example (see Patent Document 1). That is, the electric contact 1 is composed of a plunger 2 and a spring member 3, and the electric contact 1 is held by the upper holding member 5 and the lower holding member 6 of the socket body 4. By this electrical contact 1, the wiring board 7 and an electrical component (IC package) (not shown) disposed on the upper side are electrically connected.

  More specifically, the plunger 2 is formed with a contact portion 2a that comes into contact with the electrical component at the upper end portion, and a flange portion 2b that is prevented from coming off at an intermediate portion, and is further provided under the flange portion 2b. A shaft portion 2c is formed on the side.

  The spring member 3 includes a normal winding portion 3a in which a wire is wound in an expandable manner and a close-up winding portion 3b in which the wire is wound in close contact with each other. The spring member 3 is continuously formed in the normal winding portion 3a. The shaft portion 2c of the plunger 2 is inserted. Then, the spring member 3 and the plunger 2 are electrically connected by being brought into contact with each other, and the tightly wound portion 3 b of the spring member 3 is electrically connected to the electrode portion 7 a of the wiring board 7. ing.

  In such a case, an electrical component is accommodated on the upper side of the plunger 2, and when the plunger 2 is pushed downward by the electrical component, the normal winding portion 3a of the spring member 3 is compressed and the plunger 2 is lowered. To do. When this compressive force acts on the contact portion 2a of the plunger 2 and the tightly wound portion 3b of the spring member 3, the contact portion 2a serves as a terminal of the electrical component, and the tightly wound portion 3b serves as the electrode portion 7a of the wiring board 7. The contact is made at a predetermined contact pressure.

Thereby, the terminal of the electrical component and the electrode portion 7a of the wiring board 7 are electrically connected, and in this state, a burn-in test or the like of the electrical component (IC package) is performed.
Japanese Patent Laid-Open No. 10-239349.

  However, in such a conventional one, the normal winding portion 3a of the spring member 3 is positioned around the shaft portion 2c of the plunger 2, and the holding holes 5a, Since the normal winding part 3a of the spring member 3 that can be expanded and contracted is interposed between the inner walls 5b and 6b of the 6a, the normal winding part 3a is expanded and contracted between the inner walls 5b and 6b and the shaft part 2c. Since a relatively large clearance is required as possible, the shaft portion 2c and the like is inclined when the plunger 2 moves up and down, and stable vertical movement cannot be obtained, and the shaft portion 2c and the spring member 3 are It is difficult to say that the contact stability is good.

  Further, when the shaft portion 2c and the inner walls 5b, 6b of the holding holes 5a, 6a of the holding members 5, 6 are made as narrow as possible to prevent the shaft portion 2c from tilting, the normal winding of the spring member 3 is performed. When the portion 3a is expanded and contracted, the normal winding portion 3a may be sandwiched between the shaft portion 2c and the inner walls 5b and 6b of the holding holes 5a and 6a, which may hinder the expansion and contraction operation of the spring member 3.

  Therefore, an object of the present invention is to provide an electrical contactor and an electrical component socket that achieve the stability of the up-and-down movement of the plunger and the expansion and contraction of the spring member and the contact stability between the plunger and the spring member.

In order to achieve the above object, the invention according to claim 1 is a plunger made of a conductive material having a plunger side contact portion in contact with the first electrical component and a cylindrical portion continuous to the plunger side contact portion; An electric contact provided with a spring member made of a conductive material inserted into the cylindrical portion of the plunger, wherein the spring member is integrally formed and is a telescopic normal winding portion inserted into the cylindrical portion. And a tightly wound portion provided with a spring-side contact portion that protrudes outward from the tubular portion and comes into contact with the second electrical component, and the tightly wound portion is an opening provided in the tubular portion. An electrical contact is provided so as to project from the inside near the outside of the opening and the outer peripheral portion is in sliding contact with the inner wall surface of the cylindrical portion, thereby being electrically connected to the cylindrical portion. To do.

  According to a second aspect of the present invention, in addition to the configuration according to the first aspect, the plunger is configured such that the plunger-side contact portion and the plunger are formed by bending a conductive plate material into a cylindrical shape. The cylindrical portion having a larger diameter than the side contact portion is formed.

  According to a third aspect of the present invention, in addition to the configuration according to the first or second aspect, the tightly wound portion is formed with a stopper portion having a diameter larger than that of other portions at an intermediate portion in the vertical direction. And

According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, the cylindrical portion has a reduced diameter whose diameter is narrowed inward at or near an edge portion on the opening side. The portion of the tightly wound portion below the portion that is in sliding contact with the inner wall surface of the cylindrical portion is formed to have a diameter smaller than that of the normal winding portion. The electrical contact according to any one of claims 1 to 3, wherein the winding part is prevented from coming off from the cylindrical part.

  According to a fifth aspect of the present invention, the second electrical component is a wiring board, the socket body is disposed on the wiring board, and the first electrical component is accommodated on the upper side, and the socket body It is set as the socket for electrical components which is arrange | positioned and has the several electrical contactor as described in any one of Claims 1 thru | or 4.

  According to the first aspect of the present invention, there is provided a plunger made of a conductive material having a plunger-side contact portion that is in contact with the first electric component and a cylindrical portion that is continuous with the plunger-side contact portion; In the electrical contactor provided with the spring member made of the conductive material to be inserted, the spring member is extended and retracted from the cylindrical portion into the second electric component. Because the electric contact having the contact winding portion provided with the contact portion on the spring side to be contacted, the normal winding portion does not intervene between the cylindrical portion and the inner wall of the holding hole of the socket body, and the vertical movement Since the plunger outer surface slides on the inner peripheral surface of the holding hole, the plunger is guided to the inner peripheral surface of the holding hole unlike the conventional one. Stable without tilting It is possible to obtain the upper and lower operation, also, it is possible to ensure contact stability with the contact winding portion of the plunger of the cylinder portion and the spring member.

  Further, since the normal winding portion is not interposed between the plunger cylindrical portion and the inner wall of the holding hole of the socket body, when the normal winding portion of the spring member is expanded and contracted, the plunger cylindrical portion and the inner wall of the holding hole In the meantime, the normal winding portion is not sandwiched, and the expansion and contraction operation of the spring member is not hindered.

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, the plunger has a cylindrical plunger-side contact portion and this plunger by bending a conductive plate material into a cylindrical shape. Since the cylindrical portion having a larger diameter than the side contact portion is formed, it can be formed more easily than when forming by cutting or the like.

  According to the invention described in claim 3, in addition to the configuration described in claim 1 or 2, since the tightly wound portion is formed with a stopper portion having a larger diameter than other portions in the middle portion in the vertical direction, The spring member can be prevented from coming off from the socket body.

According to the invention described in claim 4, in addition to the configuration described in any one of claims 1 to 3, the cylindrical portion is a contraction having a diameter narrowed inward at or near the edge portion on the opening side. While the diameter portion is formed, the portion of the tightly wound portion below the portion that is in sliding contact with the inner wall surface of the cylindrical portion is formed to have a diameter smaller than that of the normal winding portion. Since the plunger and the spring member are assembled together because they are prevented from coming off from the cylindrical portion, handling is convenient in a state before the electric contactor is disposed in the socket body.

  According to the fifth aspect of the present invention, the second electrical component is a wiring board, and is disposed on the wiring board. The socket body that accommodates the first electrical component on the upper side is disposed on the socket body. And since it was set as the socket for electrical components which has the some electrical contactor as described in any one of Claims 1 thru | or 4, the socket for electrical components which has said each effect can be provided.

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

  1 and 2 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 holding 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 FIGS. 1 and 2, the socket body 14 has the contact pins 15 inserted 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. Is retained.

  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 structure (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 20a of the floating plate 20, and a guide portion is provided on the floating plate 20 to guide the IC package 12 when it is accommodated. ing.

  On the other hand, the contact pin 15 is composed of a plunger 22 electrically connected to the IC package 12 and a spring member 23 electrically connected to the wiring board 13.

  The plunger 22 is formed by bending a conductive plate material into a cylindrical shape, and is formed on a plunger side contact portion 22a that is in contact with the solder ball 12a of the IC package 12 and below the plunger side contact portion 22a. The provided cylinder part 22b is formed.

  The plunger side contact portion 22a has a cylindrical shape, and an upper end portion is formed in a crown shape, and a solder ball 12a is placed on and contacted with an upper side of the crown shape to be electrically connected.

  Further, the cylindrical portion 22b has a larger diameter than the plunger side contact portion 22a, and is configured to slide up and down on the inner walls of the holding holes 18a and 19a of the holding members 18 and 19.

  The cylindrical portion 22b is accommodated in the large diameter portions 18b and 19b of the holding holes 18a and 19a, and the plunger side contact portion 22a protrudes upward from the small diameter portion 18c of the holding hole 18a. Since the cylindrical portion 22b is formed larger than the small diameter portion 18c of the holding hole 18a, the plunger 22 is configured so as not to come out upward.

  Further, the spring member 23 is formed of a conductive material, and is formed continuously from a telescopic normal winding portion 23a inserted into the cylindrical portion 22b and below the normal winding portion 23a. The contact winding portion 23b protrudes outward (downward) from 22b.

  The outer diameter of the normal winding portion 23a and the inner wall of the cylindrical portion 22b are formed to have substantially the same diameter.

  Further, the contact winding portion 23b is provided with a spring-side contact portion 23c that is in contact with the electrode portion 13a of the wiring board 13 on the lower side, and the upper end portion 23d is a plunger in the state shown in FIG. 22 is slightly inserted into the lower end portion. As a result, the tightly wound portion 23 b is slidably contacted and electrically connected to the cylindrical portion 22 b of the plunger 22. Further, when the spring member 23 is compressed, the guideability when the tightly wound portion 23b of the spring member 23 is further inserted into the cylindrical portion 22b of the plunger 22 is improved. In the tightly wound portion 23b, a stopper portion 23e having a diameter larger than that of other portions is formed at an intermediate portion in the vertical direction.

  The stopper portion 23e is formed to have substantially the same diameter as the large-diameter portion 19b of the holding hole 19a of the lower holding member 19, and is formed to have a diameter larger than the small-diameter portion 19c of the holding hole 19a so as not to come down downward. It is configured.

  Next, the operation will be described.

  First, the case where the IC package 12 is accommodated will be described. With the cover member (not shown) opened, the IC package 12 is conveyed by an automatic machine or the like and accommodated on the floating plate 20 (see FIG. 1). At this time, the IC package 12 is guided by the guide member and accommodated in a predetermined position, and the solder ball 12a is inserted into the insertion hole 20a of the floating plate 20 as shown in FIG.

  From this state, the cover member is closed, and the IC package 12 is pressed downward by this cover member. Then, the floating plate 20 is lowered against the urging force of the spring, the solder ball 12a comes into contact with the plunger side contact portion 22a of the contact pin 15, and the plunger 22 faces downward so that the normal winding portion of the spring member 23 is placed. It is displaced against the urging force of 23a.

  When the floating plate 20 is further lowered, the floating plate 20 comes into contact with the upper surface of the upper holding member 18, the whole socket body 14 is lowered, and the bottom surface of the lower holding member 19 is brought into contact with the electrode portion 13 a of the wiring board 13. It is lowered until it comes into contact (see FIG. 2).

  As a result, the contact pin 15 is compressed against the urging force of the normal winding portion 23a of the spring member 23, so that this reaction force causes the plunger side contact portion 22a to contact the solder ball 12a of the IC package 12, or The spring-side contact portion 23c of the spring member 23 is 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.

  At this time, since the cylindrical portion 22b of the plunger 22 of the contact pin 15 is in contact with the tightly wound portion 23b of the spring member 23, the current flows between the normal winding portion 23a and the cylindrical portion 22b. The current can easily flow and the high frequency characteristics can be improved.

  Further, since the normal winding portion 23a of the spring member 23 is inserted into the cylindrical portion 22b of the plunger 22, the normal winding portion 23a is connected to the cylindrical portion 22b and the inner walls of the holding holes 18a and 19a. The outer peripheral surface of the cylindrical portion 22b of the plunger 22 that moves up and down is slid on the inner peripheral surfaces of the holding holes 18a and 19a. By sliding in this way, the plunger 22 is guided to the inner peripheral surfaces of both the holding holes 18a and 19a, unlike the conventional case. The operation can be obtained, and the contact stability between the cylindrical portion 22b of the plunger 22 and the tightly wound portion 23b of the spring member 23 can be ensured.

  Further, since the normal winding portion 23a is not interposed between the cylindrical portion 22b of the plunger 22 and the inner walls of the holding holes 18a and 19a, the cylindrical portion of the plunger 22 is expanded and contracted when the normal winding portion 23a of the spring member 23 is expanded and contracted. The normal winding portion 23a is not sandwiched between the inner wall of 22b and the holding holes 18a and 19a, and the expansion and contraction operation of the spring member 23 is not hindered.

  Furthermore, since the stopper portion 23e having a large diameter is formed at the intermediate portion of the spring member 23, the spring member 23 can be prevented from coming off.

Further, the plunger 22 can be formed more easily than when it is formed by cutting or the like by bending a conductive plate material into a cylindrical shape.
[Embodiment 2 of the Invention]

  3 and 4 show a second embodiment of the present invention.

  In the second embodiment, a diameter-reduced portion 22d that is bent inward and has a reduced diameter is formed at the end of the cylindrical portion 22b of the plunger 22 on the opening side. The tightly wound portion 23b of the spring member 23 is composed of a large-diameter spring portion 23f located in the cylindrical portion 22b and a small-diameter spring portion 23g provided continuously below this portion.

  The reduced diameter portion 22d of the plunger 22 is locked below the large diameter spring portion 23f, the small diameter spring portion 23g protrudes downward from the cylindrical portion 22b, and the small diameter spring portion 23g is the electrode of the wiring board 13. It is comprised so that the part 13a may be contacted.

  Accordingly, since the plunger 22 and the spring member 23 are assembled and integrated, the handling is convenient in a state before the contact pin 15 is disposed on the socket body 14.

  Here, the reduced diameter portion 22d is formed by bending the plate material of the cylindrical portion 22b of the plunger 22 inward, but is not limited thereto, and may be formed by caulking several points or by caulking in an annular shape. Can do. Further, the formation position of the reduced diameter portion 22d may be in the vicinity of the edge portion of the cylindrical portion 22b of the plunger 22 on the opening side.

  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. Further, the present invention is applied to the IC socket 11 for the BGA type IC package 12, but the present invention is not limited to this, and terminals are provided on the lower surface of the IC package such as LGA (Land Grid Array) type and PGA (Pin Grid Array) type. The present invention can also be applied to an IC package for an IC package provided with terminals extended from the side of the IC package, such as an IC package provided and a QFP (Quad Flat Package) type.

  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.

It is an expanded sectional view which shows the contact pin arrangement | positioning part of the IC socket which concerns on Embodiment 1 of this invention. FIG. 2 is an enlarged cross-sectional view showing a contact pin arrangement portion in a state where an IC package is pressed from the state shown in FIG. 1 according to the first embodiment. It is an expanded sectional view which shows the contact pin arrangement | positioning part of the IC socket which concerns on Embodiment 2 of this invention. FIG. 4 is an enlarged cross-sectional view showing a contact pin arrangement portion in a state where an IC package is pressed from the state shown in FIG. 3 according to the second embodiment. It is an expanded sectional view which shows a prior art example.

Explanation of symbols

11 IC socket (socket for electrical parts)
12 IC package (electrical parts)
12a Solder ball (terminal)
12b Package body
13 Wiring board
13a Electrode section
14 Socket body
15 Contact pin (electric contact)
18 Upper holding member
19 Lower holding member
20 Floating plate
22 Plunger
22a Plunger side contact part
22b Tube
22d reduced diameter part
23 Spring member
23a Normal winding part
23b Adhering winding part
23c Spring side contact
23e Stopper

Claims (5)

A plunger made of a conductive material having a plunger-side contact portion that is in contact with the first electrical component and a cylindrical portion continuous to the plunger-side contact portion, and a spring member made of a conductive material inserted into the cylindrical portion of the plunger In an electrical contact with
The spring member is provided with an integrally formed stretchable normal winding portion that is inserted into the tube portion, and a spring-side contact portion that protrudes outward from the tube portion and contacts the second electrical component. A tightly wound portion,
The tightly wound portion is provided so as to protrude from the vicinity of the inner side of the opening provided in the cylindrical portion to the outside of the opening, and the outer peripheral portion is in sliding contact with the inner wall surface of the cylindrical portion to thereby electrically connect the cylindrical portion. Connected,
An electrical contact characterized by that.   The plunger is characterized in that the conductive plate member is bent into a cylindrical shape, thereby forming the cylindrical plunger-side contact portion and the cylindrical portion having a larger diameter than the plunger-side contact portion. The electrical contact according to claim 1.   3. The electric contact according to claim 1, wherein the tightly wound portion is formed with a stopper portion having a larger diameter than other portions at an intermediate portion in the vertical direction. The cylindrical portion is formed with a reduced diameter portion whose diameter is narrowed on the inner edge portion or in the vicinity of the opening portion side, whereas the tightly wound portion is slidably in contact with the inner wall surface of the cylindrical portion. The lower part is formed with a diameter smaller than that of the normal winding part, and the reduced diameter part prevents the normal winding part from coming off from the cylindrical part. The electrical contact according to one. The second electrical component is a wiring board;
A socket body disposed on the wiring board and accommodating the first electrical component on the upper side;
An electrical component socket, comprising: a plurality of electrical contacts according to claim 1 disposed on the socket body.

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