JP5647868B2 - Electrical contact and socket for electrical parts - Google Patents

Description

  The present invention relates to an electrical contact connected to an electrical component such as a semiconductor device (hereinafter referred to as “IC package”), and an electrical component socket in which the electrical contact is disposed.

  Conventionally, as this type of electrical contact, one in which a coil spring and a plunger are inserted into a hollow portion of a cylindrical member is known (see Patent Document 1).

  In such a case, when the electric component or the like presses the plunger, the coil spring is compressed, and the compression force causes the electric component and the plunger to contact at a predetermined contact pressure, and the cylindrical member and the wiring board Contact at a predetermined contact pressure. Thereby, an electrical component and a wiring board are electrically connected via an electrical contact.

  Conventionally, the hollow part of such a cylindrical member made of metal has been formed, for example, by cutting a metal rod with a drill.

Unexamined-Japanese-Patent No. 2007-316023.

  In recent years, the pitch of terminals of an IC package tends to be narrowed. For this reason, for example, a very thin electric contact having a diameter of about 0.28 mm may be required.

  However, in such a very thin electric contact, in order to form a hollow portion in a cylindrical member by cutting a metal rod, a drill must also be used so that it is easy to break. It is very difficult to form a hollow portion having a depth of 1 mm.

  Therefore, an object of the present invention is to provide an electrical contact that can be easily manufactured even when it is very thin, and an electrical component socket using the electrical contact.

In order to achieve such a subject, the first invention is a cylindrical member having a cylindrical portion formed by bending a conductive plate into a cylindrical shape and reducing the diameter of the opening end on one end side, and A first contact member having a first contact portion having a diameter smaller than an opening end on one end side and a main body portion having a diameter larger than the opening end, and being inserted into the cylindrical portion so as to be movable up and down; In order to bias the contact member so that the first contact portion protrudes from the opening end on the one end side, a coil spring inserted into the tube portion and the opening end side on the other end side of the tube portion A fixed portion that is formed integrally with the cylindrical portion, is bent in a direction to close the opening end of the other end side, and is in contact with one end of the coil spring on the inner surface; It is formed integrally with the cylindrical portion on the opening end side, and can be elastically deformed in a direction approaching the outer surface of the fixed portion, and As the elastic deformation is restricted by abutting the outer side of the tough, characterized in that the electrical contacts and a second contact portion which is bent.

  Another feature is that the second contact portion includes a substantially hemispherical protrusion that protrudes outward.

  According to a second aspect of the present invention, there is provided a socket body that is disposed on the wiring board and accommodates an electrical component on the upper side, and a plurality of the socket body is provided, and the electrical component has one of the first contact portion and the second contact portion. And the other one of the first contact portion and the second contact portion is in contact with the wiring board. .

  According to the first and second inventions, the cylindrical portion and the second contact portion of the electric contact are bent into a cylindrical shape of the conductive plate material, the opening end on one end side is reduced in diameter, and the opening on the other end side is formed. Since the second contact portion formed integrally with the cylindrical portion on the end side is formed by bending in a direction to close the opening end on the other end side, it is easily manufactured even when the electrical contact is very thin. be able to.

Furthermore, according to the first and second aspects of the invention , the fixing portion that contacts the one end of the coil spring is provided , and the second contact portion is bent so as to contact the fixing portion during elastic deformation. The strength of the two contact portions can be improved by stacking the two contact portions, and the second contact portion can be ensured in good contact with the wiring board by giving elasticity to the second contact portion. The contact performance can be improved by bringing the contact with the fixed portion.

  According to another feature, since the substantially hemispherical protruding portion protruding outward is provided in the second contact portion, the contact by the second contact portion is substantially point contact, and good contact can be ensured.

1 is a front view of an IC socket according to an embodiment of the present invention. It is a figure which shows the contact pin which concerns on the embodiment, (a) is a front view, (b) is a longitudinal cross-sectional view of (a). It is a fragmentary sectional view showing a manufacturing process concerning the embodiment. It is a fragmentary sectional view which shows the operation | movement which concerns on the same embodiment.

  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. In order to perform a burn-in test or the like of the IC package 12 (see FIG. 4C) or the like, the spherical terminal 12a of the IC package 12 and its wiring board P are electrically connected.

  As shown in FIG. 1, the IC socket 11 is fixed on the wiring board P and has a socket body 14 in which the IC package 12 is accommodated.

  More specifically, in the socket body 14, a contact module 19 is disposed in a rectangular frame-shaped outer frame 18, and a spring 21 is disposed between the outer frame 18 and the contact module 19.

  The contact module 19 is provided with a plurality of contact pins 20 which are “electrical contacts” and accommodates an IC package on the upper side. As shown in FIG. 4, the contact module 19 includes an upper holding member 22, a lower holding member 23, a floating plate 24, and the like. The upper holding member 22 and the lower holding member 23 are held at a predetermined interval, and a floating plate 24 is urged upward by a spring (not shown) above the upper holding member 22. The contact pins 20 are inserted into the through holes 22 a, 23 a, and 24 a of the upper holding member 22, the lower holding member 23, and the floating plate 24.

  As shown in FIG. 2, the contact pin 20 includes a cylindrical member 20a, a plunger 20f as a “first contact member”, and a coil spring 20i. The cylindrical member 20a includes a cylindrical member 20b, The fixed piece 20j as the “fixed portion” and the contact piece 20k as the “second contact portion” are integrally formed.

  The cylindrical member 20a has a cylindrical portion 20b that is bent into a cylindrical shape so that both end surfaces of the conductive plate are in contact with each other at the joint surface 20n, and an upper opening end (opening on one end side) of the cylindrical portion 20b. End) The diameter is reduced on the 20d side. A plurality of protrusions 20c are provided on the side surface of the cylindrical portion 20b.

  The plunger 20f has a contact portion 20g having a diameter smaller than that of the upper opening end 20d of the cylindrical portion 20b, and a main body portion 20h having a diameter larger than that of the upper opening end 20d, and is inserted into the cylindrical portion 20b so as to be movable up and down. The The contact portion 20g comes into contact with the spherical terminal 12a of the IC package 12.

  The coil spring 20i is inserted into the cylindrical portion 20b and biases the plunger 20f upward to cause the contact portion 20g to protrude from the upper opening end 20d.

  The fixed piece 20j has a substantially disk shape as shown in FIG. 3 (e), and is formed integrally with the cylindrical portion 20b at the lower opening end (opening end on the other end side) 20e of the cylindrical portion 20b. It is bent in the direction to close the side opening end 20e. Thereby, the upper surface of the fixed piece 20j contacts the lower end of the coil spring 20i.

  The contact piece 20k is formed integrally with the cylindrical portion 20b at the lower opening end 20e of the cylindrical portion 20b, and is bent so as to be elastically deformable in a direction to close the lower opening end 20e. A substantially hemispherical protrusion 20m that protrudes downward (outside) is provided on the lower surface of the contact piece 20k. The contact piece 20k is stable in a slightly opened state, not in a state perpendicular to the opening (see FIG. 2B and the like). Thereby, the contact piece 20k will be in the state which can be elastically deformed. The contact piece 20k is elastically deformed when pressed against the electrode 13 of the wiring board P, and comes into contact with the fixed piece 20j (see FIG. 4B).

  Next, the manufacturing process of the contact pin 20 will be described with reference to FIG.

  First, a flat plate in which portions that become the cylindrical portion 20b, the fixed piece 20j, and the contact piece 20k are integrally formed is produced from a conductive plate material by punching or the like.

  Further, the flat plate is pressed or the like to form the projection 20c of the cylindrical portion 20b and the protruding portion 20m of the contact piece 20k.

  Then, by bending the flat plate into a cylindrical shape, a cylindrical portion 20b as shown in FIGS. 3A and 3E is produced.

  Next, the plunger 20f and the coil spring 20i are inserted, and then, as shown in FIG. 3 (b), the portion to be the fixed piece 20j is bent in a direction to close the lower opening end 20e.

  Further, as shown in FIG. 3C, the portion that becomes the contact piece 20k is bent in a direction to close the lower opening end 20e. In this bending process, since the fixed piece 20j is present, the contact piece 20k can be bent only to the vicinity of 90 °. Therefore, after the bending process, the contact piece 20k is stable in a state of being slightly opened from the lower opening end 20e. (See FIG. 3D).

  Next, a method of using the IC socket 11 will be described with reference to FIG.

  First, in a state before the contact module 19 of the IC socket 11 is disposed on the wiring board P, the projection 20c of the cylindrical portion 20b is located above the through hole 23a of the lower holding member 23 as shown in FIG. The contact pin 20 is held by the lower holding member 23 by being locked to the outer edge portion. In this state, the contact piece 20k is slightly opened from the lower opening end 20e.

  When the contact module 19 is disposed on the wiring board P, the contact piece 20 k of the contact pin 20 comes into contact with the electrode 13 of the wiring board P. Thereafter, when the upper holding member 22 and the lower holding member 23 further approach the wiring board P, the protrusion 20c of the cylindrical portion 20b comes into contact with the lower outer edge portion of the through hole 22a of the upper holding member 22, and this lower outer edge. The portion presses the contact pin 20 downward. As a result, as shown in FIG. 4B, the contact piece 20k of the contact pin 20 is elastically deformed and pressed against the fixed piece 20j.

  Subsequently, when the IC package 12 is set on the floating plate 24 of the IC socket 11 and the IC package 12 is pressed downward, the floating plate 24 is lowered against the urging force of the spring. The spherical terminal 12a contacts the contact portion 20g of the plunger 20f and presses the contact portion 20g. As a result, the plunger 20f is pushed downward against the urging force of the coil spring 20i, resulting in a state as shown in FIG. In this way, the spherical terminal 12a of the IC package 12 and the electrode 13 of the wiring board P are electrically connected.

  In this state, a current is passed through the IC package 12 to perform a burn-in test or the like.

  As described above, in the above-described embodiment, the cylindrical portion 20b and the contact piece 20k of the contact pin 20 are bent into a cylindrical shape while the upper opening end 20d is reduced in diameter, and the bottom of the cylindrical portion 20b. The contact piece 20k is formed integrally with the side opening end 20e, and is formed by bending in a direction to close the bottom opening end 20e. For this reason, the very thin contact pin 20 can be manufactured easily.

  Moreover, in the said embodiment, since the pressing force is disperse | distributed to the fixed piece 20j and the contact piece 20k by the structure which the contact piece 20k presses the fixed piece 20j, the intensity | strength of the contact piece 20k can be improved.

  In addition, since the contact piece 20k is in contact with the fixed piece 20j, current easily flows through the entire cylindrical portion 20b, and the conduction performance of the contact pin 20 is improved.

  Furthermore, since the contact piece 20k is formed so as to be elastically deformable, irregularities on the surface of the wiring board P can be absorbed, so that the contact between the contact piece 20k and the electrode 13 can be improved.

  Conventionally, a contact pin provided with plungers on both upper and lower ends is known. However, if the plungers are provided on both ends, the total length of the contact pin becomes very long, which deteriorates the high frequency characteristics of the contact pin. As a method of shortening the total length of the contact pin, a method of shortening the coil spring can be considered, but if it is too short, the elastic force of the contact portion cannot be sufficiently increased. On the other hand, in the above embodiment, instead of the one plunger, the contact piece 20k is formed so as to be elastically deformable by bending, so that the overall length of the coil spring 20i is made longer than before and the elastic force is increased. This can be ensured and the total length of the contact pin 20 can be shortened.

  In the above embodiment, the present invention is applied to the IC socket 11 as the “electrical component socket”. However, the present invention is not limited to this, and can be applied to other devices.

  In the above-described embodiment, the plunger 20f is used with the contact piece 20k on the upper side and the contact piece 20k on the lower side. However, it can be used with the contact piece 20k on the upper side and the plunger 20f on the lower side.

11 IC socket (socket for electrical parts)
12 IC package (electrical parts)
12a spherical terminal
13 electrodes
14 Socket body
18 Outer frame
19 Contact module
20 Contact pin (electric contact)
20a Tubular member
20b cylinder
20c protrusion
20d Upper open end (open end on one end)
20e Lower open end (open end on the other end)
20f Plunger (first contact member)
20g contact area
20h body
20i coil spring
20j Fixed piece (fixed part)
20k contact piece (second contact part)
20m protrusion
21 Spring
22 Upper holding member
23 Lower holding member
24 Floating plate
22a, 23a, 24a Through hole P Wiring board

Claims (3)

A cylindrical member having a cylindrical portion formed by bending the conductive plate into a cylindrical shape and reducing the diameter of the opening end on one end side;
A first contact member having a first contact portion having a diameter smaller than the opening end on the one end side of the cylindrical portion and a main body portion having a diameter larger than the opening end, and is inserted into the cylindrical portion so as to be movable up and down. When,
A coil spring inserted into the cylindrical portion to urge the first contact member to project the first contact portion from the open end on the one end side;
The cylindrical portion is formed integrally with the cylindrical portion on the opening end side on the other end side, is bent in a direction to close the opening end on the other end side, and is fixed to come into contact with one end of the coil spring on the inner surface. And
The cylindrical portion is formed integrally with the cylindrical portion on the opening end side of the other end side, and can be elastically deformed in a direction approaching the outer surface of the fixing portion, and is in contact with the outer surface of the fixing portion. A second contact portion that is bent so that the elastic deformation is regulated by contact;
An electrical contact comprising: The electrical contact according to claim 1, wherein the second contact portion includes a substantially hemispherical protrusion that protrudes outward. A socket body disposed on the wiring board and containing electrical components on the upper side;
A plurality of the socket main body, one of the first contact member or the second contact portion is in contact with the electrical component, and the other of the first contact portion or the second contact portion is in contact with the wiring board; The electrical contact according to claim 1 or 2,
A socket for electrical parts, comprising:

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