JP5038816B2 - socket - Google Patents

Description

  The present invention relates to a socket.

Conventionally, various types of sockets for electrically connecting electrodes between devices such as an IC package and a circuit board are known. For example, in the socket of Patent Document 1, a sheet on which a plurality of contacts are formed is placed on a base plate, and an IC package housed in a pressing jig body is mounted thereon. At this time, the base plate and the sheet are assembled with pins in a predetermined positional relationship, and the pressing jig is fixed to the base plate with bolts. The contact and the electrode of the IC package are electrically connected by the pressing force generated when the cover member of the pressing jig is closed.
JP 2005-259356 A

  By the way, a socket in which a thin sheet formed so that an elastic contact protrudes is attached to a frame may be used. In this case, the sheet is attached to the frame in advance by pasting or the like. Then, the upper and lower ends of the contacts elastically deformed by the pressing force when the socket is placed on the substrate and the IC package is mounted thereon are connected to the electrodes of the device. For this reason, in order for the contact to maintain a predetermined elastic force at a predetermined position and to stably connect the electrodes to each other, it is necessary that the electrode and the contact be in contact with each other according to the design intention. It is necessary to prevent the sheet from being distorted so that the contact posture does not change.

  However, in such a socket, the sheet tends to elongate due to the pressing force of the IC package acting through the contact or thermal expansion during use. However, if the sheet and the frame are fixed so as not to move relative to each other, Elongation is not allowed. Therefore, the sheet is distorted, and stable connection between the contact and the electrode may be hindered. In particular, in recent years, the demand for miniaturization has increased in the field of information processing equipment, and the pitch of device electrodes has been narrowed, and high accuracy is required for the connection between contacts and electrodes. There was.

  This invention is made | formed in view of such a subject, and it aims at providing the socket which can suppress generation | occurrence | production of distortion of a sheet | seat.

  The present invention adopts the following means in order to achieve the above-mentioned object.

The socket of the present invention is
A socket for electrically connecting electrodes facing each other by mounting the first device and being placed on the second device,
A sheet on which a plurality of contacts capable of electrically connecting the electrodes are formed;
A plurality of engaging portions formed on the sheet;
The sheet is formed of a material having a coefficient of thermal expansion different from that of the sheet, and a frame having an accommodating portion capable of accommodating the periphery of the sheet so as to have a gap in the thickness direction of the sheet
A mount portion formed above the housing portion of the frame and capable of mounting the first device;
A plurality of engaged portions that are formed on a sheet-facing surface that faces the sheet among the accommodating portions and are engaged with each of the plurality of engaging portions;
With
The plurality of engaging portions and the plurality of engaged portions are engaged so as to allow the sheet to expand and contract with respect to the frame.
Is.

  In this socket, the plurality of engaging portions formed on the sheet and the plurality of engaged portions formed on the sheet facing surface among the housing portions of the frame allow the seat to expand and contract with respect to the frame. Is engaged. When the first device is mounted on the mount portion of the socket and the socket is placed on the second device, the electrodes facing each other are electrically connected by a plurality of contacts formed on the sheet. Here, even if the pressing force of the first device mounted on the mount portion acts to extend the sheet through the contact, the sheet can be extended with respect to the frame, so that the occurrence of distortion of the sheet is suppressed. Can do. In addition, even if a shift due to a difference in thermal expansion occurs between the sheet and the frame while the electrodes facing each other are electrically connected, the sheet may expand and contract with respect to the frame. Therefore, the occurrence of sheet distortion can also be suppressed.

  In the socket of the present invention, the plurality of engaging portions are a plurality of convex portions and the plurality of engaged portions are a plurality of concave portions, or the plurality of engaging portions are a plurality of concave portions. The part may be a plurality of convex parts. Here, for example, the convex portion is a pin or a bulge, and the concave portion is a hole or a depression. If it carries out like this, a sheet | seat and a frame can be engaged comparatively easily. In this case, the plurality of recesses include stretchable recesses that are formed long along a predetermined direction, and the protrusions engaged with the stretchable recesses are stretched by the seat with respect to the frame. It is good also as what is inserted in the said predetermined direction so that relative movement is possible with respect to the said expansion-contraction tolerance type | mold recessed part. In this way, it is possible to allow the sheet to expand and contract only in a predetermined direction, and to restrict the expansion and contraction of the sheet in other directions. In this case, of the convex portions engaged with the expansion / contraction-permissible concave portion, two convex portions on the same line passing through the center of the sheet are arranged at positions outside the respective expansion-permissible concave portions in the initial state. It is good as it is. Here, the initial state refers to a state in which the seat and the frame are simply engaged by the plurality of engaging portions and the engaged portions at normal temperature. That is, since the electrodes between the two devices are not connected, the contact is in an unloaded and normal temperature state. In this way, when engaging the plurality of engaging portions formed on the sheet and the plurality of engaged portions formed on the sheet-facing surface among the housing portions of the frame, the seat is fixed to the frame. It can be fixed in the initial position.

  In the socket having such a retractable recess, the plurality of contacts are cantilevers formed so that their longitudinal directions face the same direction, and the protrusions engaged with the retractable recess are movable relative to each other. The predetermined direction may be the longitudinal direction of the cantilever. In this way, the direction in which the pressing force when mounting the first device acts to stretch the sheet through the contact is along the longitudinal direction of the cantilever. Accordingly, since the direction of the pressing force when the first device is mounted coincides with the predetermined direction in which the convex portion engaged with the expansion / contraction-permissible concave portion can move relatively, the expansion and contraction of the sheet in the longitudinal direction of the cantilever is allowed. It becomes easy to prevent unnecessary displacement of the cantilever in the direction other than the longitudinal direction. In this case, the sheet may be a substantially rectangular sheet, and the longitudinal direction of the cantilever may be a diagonal direction of the substantially rectangular sheet. In this way, handling becomes relatively easy.

  In the socket of the present invention, the plurality of engaging portions are a plurality of convex portions and the plurality of engaged portions are a plurality of concave portions, or the plurality of engaging portions are a plurality of concave portions. When the portion is a plurality of convex portions, a part of the plurality of concave portions may include a fixed concave portion formed in a shape in which the corresponding convex portion is immovably fitted. In this way, the seat can be fixed to the predetermined initial position with respect to the frame relatively easily.

  The socket of this invention WHEREIN: The said accommodating part is good also as a step part of the height exceeding the thickness of the said sheet | seat. By so doing, the elongation of the sheet can be absorbed relatively easily.

  Next, embodiments of the present invention will be described with reference to the drawings. 1 is a top view showing a configuration of a socket 10 according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is a bottom view showing the configuration of the socket 10.

  As shown in FIG. 1, the socket 10 according to the present embodiment includes a substantially square sheet 20 having a plurality of contacts 22 and a frame 30 to which the sheet 20 is attached.

  The sheet 20 is composed of a polyimide film 20a provided with a large number of rectangular holes 26 along a diagonal direction, and cantilever-shaped beryllium copper contacts 22. The seat 20 has oval holes 24a and 24b (corresponding to the engaging portion of the present invention) into which the pins 42a and 42b (corresponding to the engaged portion of the present invention) of the frame 30 are inserted. As shown in FIG. 3, the oval holes 24 a and 24 b are provided at diagonal positions of the sheet 20, and the major axis direction coincides with the longitudinal direction of the contact 22. The thermal expansion coefficient of polyimide is about 12 ppm / K. Further, as shown in FIG. 2, the contact 22 is supported in a cantilever shape on the film 20 a, and is curved so that it protrudes slightly below the lower surface of the sheet 20, and then the free end is higher than the upper surface of the sheet 20. It is formed so as to largely protrude upward. This free end becomes the first contact 22a for the first device mounted on the frame 30, and the portion protruding slightly below the lower surface of the sheet 20 is the second contact for the second device on which the socket 10 is placed. 22b. The contacts 22 are formed so that all the first contacts 22a are directed in one direction in the diagonal direction of the sheet 20, that is, the longitudinal directions thereof are directed in the same direction. The thermal expansion coefficient of beryllium copper, which is the material of the contact 22, is about 17 ppm / K.

  As shown in FIG. 2, the frame 30 is formed on two surfaces of the mount portion 32 on which the first device 50 (see FIG. 5) can be mounted, an inner wall 34 formed above the mount portion 32, and the inner wall 34. And a plurality of protrusions 36 (see FIG. 1) that contact the side surfaces of the first device 50 and a first device provided and mounted on a surface of the inner wall 34 that faces two surfaces on which the protrusions 36 are formed. An arm portion 38 (see FIG. 1) that presses and holds the side surfaces of 50, a step portion 40 (corresponding to a housing portion of the present invention) provided on the lower surface of the frame 30, and a sheet of the step portion 40 that faces the sheet 20 Cylindrical pins 42a and 42b formed on the facing surface 40a. Even when the socket 10 is connected between two devices and the thickness of the sheet 20 is increased due to thermal expansion, the stepped portion 40 exceeds the thickness of the sheet 20, that is, the sheet facing surface 40a and the sheet 20 It is designed to always ensure a gap between the sheet 20 and the sheet 20 and the second device. Further, as shown in FIG. 3, the pins 42 a and 42 b are formed so as to be inserted into positions outside the oval holes 24 a and 24 b of the sheet 20, that is, positions opposite to the center of the sheet 20. ing. Further, the pins 42a and 42b are located slightly outside the outer circular arc in the major axis direction of the inserted oval holes 24a and 24b at the outermost positions on the outer peripheral surfaces when inserted into the oval holes 24a and 24b. It is designed to be located outside (for example, 10 μm / one side). That is, as shown in FIG. 4, the distance L1 connecting the outermost positions of the outer peripheral surfaces of the pins 42a and 42b facing each other is greater than the distance L2 connecting the outermost positions of the oval holes 24a and 24b. Designed to be slightly longer. Therefore, when the pins 42a and 42b are inserted into the oval holes 24a and 24b, the sheet 20 is attached to the frame 30 at a predetermined initial position in a tensioned state. The frame 30 is made of PPS (polyphenylene sulfide) resin, and the coefficient of thermal expansion of the PPS resin is 2 to 4 ppm / K.

  Next, the case where the opposing electrodes are electrically connected between devices using the thus configured socket 10 will be described with reference to FIG. FIG. 5 is an explanatory diagram showing a usage state of the socket 10. As shown in FIG. 5, the first device 50 is mounted on the mount portion 32 of the frame 30 and the socket 10 is placed on the second device 60, so that the electrodes facing each other between the devices 50, 60 are contacted 22. Electrical connection through The first device 50 is, for example, an IC package, has a first electrode 52 on the lower surface, and receives a pressing force from above by a cover (not shown). The first electrode 52 is connected to the first contact 22 a of the contact 22 by the pressing force of the first device 50. The first device 50 generates heat during operation. The second device 60 is, for example, a printed board, and includes a second electrode 62 on the upper surface, and the socket 10 is fixed and placed at a predetermined position by a fixing pin (not shown). The second electrode 62 is connected to the second contact 22 b of the contact 22 that has received the pressing force of the first device 50.

  Next, expansion and contraction of the seat 20 when the socket 10 is used will be described. First, the expansion and contraction of the sheet 20 due to the pressing force of the first device 50 will be described with reference to FIG. FIG. 6 is an enlarged cross-sectional view when the first device 50 is mounted on the socket 10 placed on the second device 60. FIG. 6A shows a state before the first device 50 is mounted, FIG. Is after the first device 50 is mounted. As shown in FIG. 6A, in the state where the socket 10 is placed on the second device 60, the positional relationship between the seat 20 and the frame 30 is substantially the same as the initial position, and the pin 42a has an oval hole 24a. Of the sheet 20, that is, on the side opposite to the center of the sheet 20. Next, as shown in FIG. 6B, in the state where the first device 50 is mounted on the frame 30, the contact 22 bends downward with the second contact 22 b as a fulcrum by the pressing force of the first device 50. Receives horizontal force in the middle left direction. For this reason, since the second contact 22b moves to the left and the sheet 20 is stretched to the left, the pin 42a moves relatively to the vicinity of the center of the oval hole 24a. That is, it can be said that the oval hole 24a is a stretchable recess. In addition, since the pin 42b is formed on the base point side of the horizontal force direction by the pressing force of the first device 50, the pin 42b does not move relatively in the oval hole 24b.

  Next, thermal expansion of the sheet 20 due to heat generated by the first device 50 will be described with reference to FIG. 7 is an enlarged cross-sectional view when the devices 50 and 60 are electrically connected by the socket 10, FIG. 7A is immediately after the start of connection, and FIG. 7B is a long time elapsed from the start of connection. Later. As shown in FIG. 7A, in the state where the connection has just started, the first device 50 is not generating heat and the sheet 20 is not thermally expanded. On the other hand, when a long time has elapsed since the start of connection, the temperature of the first device 50 rises, and the heat from the first device 50 is transmitted to the seat 20 and the frame 30 directly or through the surrounding atmosphere. At this time, the temperature of the contact 22 rises to about 100 ° C. or higher. For this reason, although the sheet | seat 20 and the flame | frame 30 thermally expand, since a coefficient of thermal expansion differs, elongation is not uniform. Here, the polyimide film 20a and the beryllium copper contact 22 have a larger coefficient of thermal expansion than the PPS resin. Therefore, the sheet 20 extends from the center toward the outside due to thermal expansion, but the elongation of the frame 30 is very small compared to the sheet 20. Therefore, as shown in FIG. 7B, the absolute position of the pin 42a is hardly changed, and the pin 42a is relatively located inside the oval hole 24a, that is, relative to the center side of the sheet 20 due to thermal expansion of the sheet 20. Moving. Similarly, the pin 42b moves relatively and moves near the center of the oval hole 24b. That is, the oval holes 24a and 24b can be said to be expansion / contraction allowance-type recesses.

  According to the socket 10 of this embodiment described in detail above, the seat 20 is engaged with the frame 30 so as to allow the seat 20 to expand and contract. Therefore, even if the pressing force of the first device 50 mounted on the mount portion 32 acts to extend the sheet 20 via the contact 22, the sheet 20 can extend with respect to the frame 30, so that the distortion of the sheet 20 Can be suppressed. In addition, even if a shift due to a difference in thermal expansion occurs between the sheet 20 and the frame 30 in a state where the electrodes facing each other between the devices 50 and 60 are electrically connected to each other, Since the sheet 20 can be expanded and contracted, the occurrence of distortion of the sheet 20 can also be suppressed.

  In addition, since the frame 30 and the seat 20 are engaged with each other by the pins 42a and 42b formed in the stepped portion 40 of the frame 30 and the oval holes 24a and 24b formed in the seat 20, the seat 20 and the frame 20 are relatively easily engaged. 30 can be engaged. Furthermore, since the oval holes 24a and 24b are formed long along the diagonal direction, and the pins 42a and 42b are inserted so as to be relatively movable in the diagonal direction, the sheet 20 is allowed to expand and contract only in the diagonal direction. The expansion and contraction and displacement of the sheet 20 in the direction can be restricted. Furthermore, since the pins 42a and 42b are arranged at positions outside the oval holes 24a and 24b in the initial state, the seat 20 can be fixed to the frame 30 at a predetermined initial position. . In addition, since the horizontal component of the pressing force of the first device 50 matches the direction in which the pins 42a and 42b engaged with the oval holes 24a and 24b can move relative to each other, the sheet in the longitudinal direction of the contact 22 is aligned. It is easy to allow expansion and contraction of the contact 22 and to prevent unnecessary displacement of the contact 22 in the direction other than the longitudinal direction. It is easy to allow the sheet 20 to expand and contract. Furthermore, since the sheet 20 is a substantially square sheet, and the longitudinal direction of the cantilever is the diagonal direction of the sheet 20, handling is relatively easy. Still further, since the stepped portion 40 of the frame 30 exceeds the thickness of the sheet 20, the elongation of the sheet 20 can be absorbed relatively easily.

  It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  For example, in the above-described embodiment, the two oval holes 24a and 24b and the two pins 42a and 42b are provided, but they may be as shown in FIG. FIG. 8 is a bottom view showing the configuration of the socket 100 according to another embodiment. For convenience of explanation, the same reference numerals are given to the same configurations as those in the above-described embodiment, and the description thereof will be omitted below. As shown in FIG. 8, oval holes 24c and 24d and pins 42c and 42d may be provided in the other diagonal direction. In this case, the direction in which the oval holes 24c and 24d are formed may be the same direction as the oval holes 24a and 24b (see FIG. 8), or may be a direction orthogonal to the oval holes 24a and 24b. . In the former case, the expansion and contraction of the sheet 20 due to the pressing force when the first device 50 is mounted is easily allowed, and in the latter case, the thermal expansion of the sheet 20 due to the heat generated by the first device 50 is easily allowed. Further, a plurality of oval holes and pins may be provided.

  In the above-described embodiment, the two oval holes 24a and 24b are provided, and the pins 42a and 42b are arranged at positions outside the oval holes 24a and 24b in the initial state. 9 may be used. FIG. 9 is a bottom view showing the configuration of the socket 110 according to another embodiment. As shown in FIG. 9, it is good also as what provides the fixing hole 25 (equivalent to the fixed recessed part of this invention) formed in the circular shape into which the pin 42b is immovably fitted. In this way, the sheet 210 can be fixed to the predetermined initial position with respect to the frame 30 relatively easily. In this case, the fixing hole 25 may be formed on the base point side (see FIG. 9) of the horizontal force acting on the sheet 20 when the cantilever-shaped contact 22 is pressed. In this way, the direction of the horizontal force acting so that the pressing force when the first device 50 is mounted extends the sheet 20 through the contact 22 is based on the position where the fixing hole 25 is formed. Accordingly, since the expansion and contraction of the sheet 20 is not restricted on the working side in the horizontal direction of force, the distortion of the sheet 20 can be reduced.

  In the embodiment described above, the first contacts 22a of the contacts 22 are all formed so as to face one direction in the diagonal direction of the sheet 20, but may be as shown in FIG. 10 or FIG. FIG. 10 is a bottom view showing the configuration of the socket 120 according to another embodiment, and FIG. 11 is a bottom view showing the configuration of the socket 130 according to another embodiment. As shown in FIG. 10, the first contacts 22a of the contacts 22 in the two regions separated by the boundary line BL may be arranged so as to face each other, or as shown in FIG. You may arrange | position so that the 1st contact 22a of the contact 22 of the divided | segmented two area | regions may face the mutually opposite direction. In the case of FIG. 11, since the direction of the horizontal force acting so that the pressing force of the first device 50 stretches the sheet 20 via the contact 22 cancels out, the expansion and contraction of the sheet 20 when the first device 50 is mounted. Can be reduced. The contact 22 may be oriented in the opposite direction, not the diagonal direction.

  In the embodiment described above, the oval holes 24a and 24b are provided in the sheet 20 and the pins 42a and 42b are provided in the frame 30, but the pins and ridges are provided in the sheet 20, and the oval holes and depressions are provided in the frame 30. It is good also as what provides.

  In the embodiment described above, the shape of the hole formed in the sheet 20 is an oval, but it may be a rectangle, a triangle or other polygons.

  In the embodiment described above, the oval holes 24a and 24b and the pins 42a and 42b are provided on the diagonal line, but may be provided along the sides.

  In the embodiment described above, the material of the film 20a is polyimide. The material may be selected. Further, although the material of the contact 22 is beryllium copper, any material may be selected as long as it has conductivity and elasticity, such as nickel beryllium. Further, although the material of the frame 30 is PPS resin, any material can be used as long as it has insulating properties such as engineering plastics and ceramics and has a coefficient of thermal expansion different from that of the sheet 20 including the film 20a and the contact 22. The material may be selected.

  In the embodiment described above, the contact 22 protrudes greatly only upward, but may protrude largely downward.

FIG. 3 is a top view showing the configuration of the socket 10. AA sectional drawing of FIG. FIG. 3 is a bottom view showing the configuration of the socket 10. Explanatory drawing which shows distance L2 between pins, and distance L2 between oblong holes. An explanatory view showing a use state of socket 10. FIG. The expanded sectional view in case the 1st device 50 is mounted in the socket 10 mounted in the 2nd device 60. FIG. FIG. 4 is an enlarged cross-sectional view when the devices 10 and 60 are electrically connected by the socket 10. The bottom view which shows the structure of the socket 100 of another embodiment. The bottom view which shows the structure of the socket 110 of another embodiment. The bottom view which shows the structure of the socket 120 of another embodiment. The bottom view which shows the structure of the socket 130 of another embodiment.

Explanation of symbols

  10, 100, 110, 120, 130 socket, 20, 200, 210, 220, 230 sheet, 20a film, 22 contact, 22a first contact, 22b second contact, 24a, 24b, 24c, 24d oval hole, 25 Fixing hole, 26 square hole, 30 frame, 32 mount part, 34 inner wall, 36 projection part, 38 arm part, 40 step part, 40a sheet facing surface, 42a, 42b, 42c, 42d pin, 50 first device, 52 first 1 electrode, 60 second device, 62 second electrode.

Claims (3)

A socket for electrically connecting electrodes facing each other by mounting the first device and being placed on the second device,
A substantially rectangular sheet formed with a plurality of contacts capable of electrically connecting the electrodes;
A plurality of engaging portions formed on the sheet;
The sheet is formed of a material having a coefficient of thermal expansion different from that of the sheet, and a frame having an accommodating portion capable of accommodating the periphery of the sheet so as to have a gap in the thickness direction of the sheet;
A mount portion formed above the housing portion of the frame and capable of mounting the first device;
A plurality of engaged portions that are formed on a sheet-facing surface that faces the sheet among the accommodating portions and are engaged with each of the plurality of engaging portions;
With
The plurality of engaging portions and the plurality of engaged portions are engaged so as to allow the seat to expand and contract with respect to the frame ,
The plurality of engaging portions are a plurality of convex portions, and the plurality of engaged portions are a plurality of concave portions, or the plurality of engaging portions are a plurality of concave portions, and the plurality of engaged portions are a plurality of convex portions. And
The plurality of recesses include stretchable recesses formed long along a predetermined direction,
The convex portion engaged with the stretchable recess is inserted so as to be movable relative to the stretchable recess when the seat is stretched with respect to the frame. In the initial state, two protrusions on the same line passing through the center of the sheet among the protrusions engaged with each other are disposed at positions outside the respective stretch-allowable recesses,
The plurality of contacts are cantilevers formed such that their longitudinal directions face the same direction,
The predetermined direction in which the convex portion engaged with the expansion / contraction-permissible concave portion is relatively movable is a longitudinal direction of the cantilever, and the longitudinal direction of the cantilever is a diagonal direction of the substantially rectangular sheet.
socket. A part of the plurality of concave portions includes a fixed concave portion formed in a shape in which the corresponding convex portion is immovably fitted.
The socket according to claim 1 . The accommodating portion is a stepped portion having a height exceeding the thickness of the sheet.
The socket according to claim 1 or 2 .

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