JP2009043459A - Electric connection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric connection device by which jointing strength of connecting objects is increased and positioning of the connecting objects is carried out readily. <P>SOLUTION: A plurality of pillar-like conductive members 5 having elasticity are installed on an insulating sheet 3 having thermosetting performance for jointing a printed-circuit board 21 and a connector 22 so as to penetrate from one face to the other face. Hold-down members 7 which have a lower melting point than a hardening temperature of the insulating sheet 3 and are made of a low-melting point metal for welding to the connecting parts 212, 222 installed respectively on the printed-circuit board 21 and the connector 22, are provided on the insulating sheet 3 so as to penetrate from one face to the other face. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sheet-like electrical connection device that is interposed between two connection objects and mechanically and electrically connects the connection objects.

  Conventionally, a connector sheet including a sheet-like base material and a plurality of conductive members is known (see Patent Document 1 below).

  The sheet-like substrate is composed of, for example, a silicone resin, an epoxy resin (a kind of thermosetting resin), and an inorganic filler. The front and back surfaces of the sheet-like substrate contain a thermosetting resin. The silicone resin mainly exhibits adhesiveness, the epoxy resin mainly plays a role of expressing adhesiveness, and the inorganic filler plays a role of controlling the thermal expansion coefficient of the sheet substrate after permanent adhesion.

  Although tackiness appears on the front and back surfaces of the sheet-like substrate under the first temperature condition, adhesiveness appears under the second temperature condition.

  Each conductive member extends in the thickness direction of the sheet-like base material, penetrates the sheet-like base material, and one end of the conductive member is exposed on the surface of the sheet-like base material. The end is exposed on the back surface of the sheet-like substrate.

  When the connector sheet is used, adhesiveness is developed on the front and back surfaces of the sheet-like base material under the first temperature condition, and in this state, the connection object is attached to the front and back surfaces of the connector sheet.

  Then, adhesiveness is made to express on the surface and back surface of a sheet-like base material on 2nd temperature conditions, and connection objects are adhere | attached.

As a result, the connection objects are electrically connected to each other by the plurality of conductive members.
Japanese Patent Laying-Open No. 2005-236256 (see paragraphs 0071 to 0076, FIG. 1)

  In the connector sheet described above, since the connection objects are bonded together only by the thermosetting resin of the sheet-like base material, for example, if the connection object is large, there is a possibility that the bonding strength is insufficient. Further, when bonding the connection objects, it is necessary to perform positioning using a jig or the like.

  The present invention has been made in view of such circumstances, and the problem thereof is an electrical connection device that can increase the bonding strength between the connection objects and can easily perform the positioning of the connection objects. Is to provide.

  In order to solve the above-mentioned problem, an electrical connection device according to the invention of claim 1 is disposed between two connection objects, and the two electrical connection devices mechanically and electrically connect the connection objects. A sheet-like insulator having thermosetting properties for joining the objects to be connected, and provided on each of the two objects to be connected to the insulator so as to penetrate from the one surface to the other surface. A plurality of elastic columnar conductive members for conducting between the terminal portions provided, and the insulator, having a melting point lower than the curing temperature of the insulator, each of the two connection objects And a metal part for welding to a connection part provided in the case.

  Since the metal part for welding to the connection part provided in each of two connection objects as mentioned above is provided, not only two connection objects are joined by an insulator, but also by a point metal part. Are also joined.

  According to a second aspect of the present invention, in the electrical connection device according to the first aspect, the metal part is columnar and penetrates from one surface of the insulator to the other surface.

  According to a third aspect of the present invention, in the electrical connection device according to the first or second aspect, the insulator is disposed on both sides of the base sheet having a low thermal expansion coefficient and high tensile resistance, and the base sheet. And a thermosetting resin layer.

  According to a fourth aspect of the present invention, in the electrical connection device according to the third aspect, the material of the base sheet is polyimide or aramid.

  According to a fifth aspect of the present invention, in the electrical connecting device according to the third or fourth aspect, the material of the thermosetting resin layer is an epoxy resin.

  The invention according to claim 6 is the electrical connection device according to any one of claims 1 to 5, wherein the conductive member includes an elastic resin material and conductive metal particles mixed in the elastic resin material. It is characterized by being.

  According to a seventh aspect of the present invention, in the electrical connecting device according to any one of the first to sixth aspects, the metal part is composed of a flux and conductive metal particles mixed in the flux. Features.

  According to this invention, the joint strength between the connection objects can be increased. In addition, since the self-alignment function works due to the configuration of the metal part, it is possible to easily position the connection objects.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of an electrical connection device according to an embodiment of the present invention.

  As shown in FIG. 1, the electrical connecting device 1 includes an insulating sheet (insulator) 3, a plurality of conductive members 5, and a plurality of hold-down members (metal parts) 7. The electrical connection device 1 is a so-called permanent connection that mechanically and electrically connects mainly a printed wiring board 21 (see FIG. 3D) which is one connection object and a connector 22 (see FIG. 3D) which is the other connection object. It is a connection type electrical connection device.

  The insulating sheet 3 has a base sheet 31 and a thermosetting resin layer 32. As a material of the base sheet 31, in order to prevent the conductive member 5 and the hold-down member 7 from being shifted in pitch in order to prevent the insulating sheet 3 from extending in the XY directions (the vertical direction and the horizontal direction of the insulating sheet 3). A material having high tensile properties and a low coefficient of thermal expansion is preferred. Specifically, polyimide, aramid and the like are preferable.

  The thermosetting resin layer 32 is provided on the upper surface and the lower surface of the base sheet 31. The thermosetting resin layer 32 is an adhesive layer. The material of the thermosetting resin layer 32 is preferably one that softens once when exposed to a thermosetting temperature (for example, 150 to 200 ° C.) and then cures with time. Specifically, an epoxy resin is preferable.

  The insulating sheet 3 has a plurality of through holes 3a and 3b. The through holes 3a are arranged at a predetermined interval. The through holes 3 b are located at both ends of the insulating sheet 3.

  Each of the plurality of conductive members 5 has a cylindrical shape, and is accommodated in the through hole 3 a of the insulating sheet 3 in a fixed state. Both ends of the conductive member 5 protrude from the through hole 3a. The material of the conductive member 5 has conductivity and elasticity. Specifically, an elastic resin material such as a silicone resin in which conductive metal fine particles such as Au and Ag are mixed is preferable.

  Each of the plurality of hold-down members 7 has a cylindrical shape, and is housed in a fixed state in the three through holes 3b of the insulating sheet. Both end portions of the hold-down member 7 protrude from the through hole 3b. The hold-down member 7 is made of a low melting point metal. The melting point of the low melting point metal is lower than the thermosetting temperature of the thermosetting resin layer 32 (for example, 110 to 140 ° C.). The low melting point metal is preferably a paste in which metal fine particles and a flux are mixed. Specific examples of the metal fine particles include Sn—Bi alloy fine particles and Sn—In alloy fine particles.

  The printed wiring board 21 (see FIG. 3D) has a terminal portion 211 and a connection portion 212. The terminal portion 211 is in contact with the conductive member 5. The shape and size of the cross section (transverse cross section) of the terminal portion 211 are substantially the same as the shape and size of the cross section (transverse cross section) of the conductive member 5. The hold-down member 7 is welded to the connection part 212. The shape and size of the cross section (transverse section) of the connecting portion 212 are substantially the same as the shape and size of the cross section (transverse section) of the hold-down member 7.

  The connector 22 (see FIG. 3D) has a terminal part 221 and a connection part 222. The terminal part 221 is in contact with the conductive member 5. The shape and size of the cross section (transverse cross section) of the terminal portion 221 are substantially the same as the shape and size of the cross section (transverse cross section) of the conductive member 5. The hold-down member 7 is welded to the connecting portion 222. The shape and size of the cross section (transverse section) of the connecting portion 222 are substantially the same as the shape and size of the cross section (transverse section) of the hold-down member 7.

  2 shows a manufacturing process of the electrical connection device shown in FIG. 1, FIG. 2A is a cross-sectional view showing a state in which a thermosetting resin layer is formed on the base sheet, and FIG. 2B shows a state in which through holes are formed in the insulating sheet. 2C is a cross-sectional view showing a state in which a conductive member and a hold-down member are formed in the through hole, and FIG. 2D is a cross-sectional view showing a state in which the release thin film is peeled off from the thermosetting resin layer.

  A manufacturing process of the electrical connection device will be described based on FIGS.

  First, as shown to FIG. 2A, the thermosetting resin layer 32 is each affixed on the surface and back surface of the base material sheet 31, and the insulating sheet 3 is created. Thereafter, the release thin film 9 is attached to the surface of each thermosetting resin layer 32.

Next, as shown in FIG. 2B, through holes 3 a, 3 b, 91, and 92 are formed in the insulating sheet 3 and the release thin film 9. The through holes 3a, 3b, 91, 92 are formed by laser processing or punching processing. In the case of laser processing, a Co ₂ laser or a YGA laser is used. Considering the influence of heat when peeling the release thin film 9 and the formation of fine through holes 3a and 91 to cope with a narrow pitch, it is desirable to use a three-dimensional high frequency of YAG.

  Thereafter, as shown in FIG. 2C, the through-holes 3a and 91 are filled with the paste-like material of the conductive member 5, and the through-holes 3b and 92 are filled with the paste-like material of the hold-down member 7. The filling is performed by, for example, printing or a dispenser.

  Finally, the release thin film 9 is peeled off from the thermosetting resin layer 32. As a result, as shown in FIG. 2D, both ends of the conductive member 5 and the hold-down member 7 protrude slightly from the thermosetting resin layer 32, respectively.

  The electrical connection device 1 is completed through the above steps.

  3 is a view for explaining a method of using the electrical connection device shown in FIG. 1. FIG. 3A is a cross-sectional view showing a state in which the electrical connection device shown in FIG. 1 is arranged on a printed wiring board. FIG. 3A is a cross-sectional view showing a state in which the connector is disposed on the electrical connection device shown in FIG. 3A, FIG. 3C is a cross-sectional view showing a state in which the electrical connection device shown in FIG. 3B is overheated at the melting point temperature of the holddown member, and FIG. FIG. 3E is a cross-sectional view showing a state in which the joining operation between the printed wiring board and the connector is completed.

  Next, connection work of the electrical connection device 1 will be described.

  First, as shown in FIG. 3A, the electrical connection device 1 is placed on the printed wiring board 21. At this time, the electrical connecting device 1 is positioned with respect to the printed wiring board 21. As a result, the conductive member 5 of the electrical connection device 1 contacts the terminal portion 211 of the printed wiring board 21, and the hold-down member 7 of the electrical connection device 1 contacts the connection portion 212 of the printed wiring board 21.

  Next, as shown in FIG. 3B, the connector 22 is placed on the electrical connection device 1. At this time, the connector 22 is positioned with respect to the electrical connection device 1. As a result, the conductive member 5 of the electrical connection device 1 contacts the terminal portion 221 of the connector 22, and the holddown member 7 of the electrical connection device 1 contacts the connection portion 222 of the connector 22.

  Thereafter, the electrical connection device 1 is heated at a temperature higher than the melting point temperature of the hold-down member 7 and lower than the thermosetting temperature of the thermosetting resin layer 32. Then, as shown in FIG. 3C, the hold-down member 7 is melted, and the center line of the through hole 3b and the center of the connection portion 212 of the printed wiring board 21 are automatically set by the surface tension of the melted hold-down member 7. Similarly, the center line of the through hole 3b and the center of the connecting portion 222 of the connector 22 are automatically overlapped, and a so-called self-alignment function works. As a result, the printed wiring board 21 and the electrical connection device 1 are accurately positioned with respect to the electrical connection device 1.

  Next, as shown in FIG. 3D, the connector 22 is pressed with a predetermined pressure by the press machine 23 while heating the electrical connection device 1 for a predetermined time at a predetermined temperature higher than the thermosetting temperature of the thermosetting resin layer 32. To do.

  When the temperature of the thermosetting resin layer 3 reaches the thermosetting temperature, the thermosetting resin layer 3 is once softened and then cured, and the printed wiring board 21 and the connector 22 are bonded together by the thermosetting resin layer 3. When the thermosetting resin layer 3 is softened, the conductive member 5 is compressed, and the thermosetting resin layer 3 is cured in this state (see FIG. 3E). Therefore, the contact force required to secure a stable conductive state is ensured between the terminal portion 211 of the printed wiring board 21 and the conductive member 5 and between the terminal portion 221 of the connector 22 and the conductive member 5. Arise.

  Thereafter, the electrical connection device 1 is cooled. At this time, the hold-down member 7 is cured and welded to the connection portions 212 and 222.

  With the above operation, as shown in FIG. 3E, the mechanical and electrical connection work between the printed wiring board 21 and the connector 22 by the electrical connection device 1 is completed.

  According to this embodiment, the printed wiring board 21 and the connector 22 are joined by the thermosetting resin layer 32, and the hold-down member 7 is welded to the connection portions 212 and 222. The bonding strength with 22 can be increased. Therefore, for example, even if the connector 22 is large, the bonding strength between the connector 22 and the printed wiring board 21 will not be insufficient.

  Further, since the hold-down member 7 is formed of a metal having a melting point lower than the thermosetting temperature of the thermosetting resin layer 32, a self-alignment function using surface tension at the time of melting works.

  Furthermore, since the insulating sheet 3 includes the base sheet 31 having a low coefficient of thermal expansion and high tensile resistance, it is possible to suppress the extension of the electrical connecting device 1 in the XY direction, and the terminal portion of the printed wiring board 21. The pitch deviation between the 211 and the conductive member 5 can be prevented, and the pitch deviation between the terminal portion 221 of the connector 22 and the conductive member 5 can be prevented.

  The hold-down member 7 of the electrical connection device 1 according to this embodiment is cylindrical and penetrates the insulating sheet 3. However, the hold-down member 7 does not need to penetrate the insulating sheet 3, for example, a belt-like hold The down member may be fixed so as to be wound around the outer peripheral surface of one end of the insulating sheet 3.

  In this embodiment, the connection between the printed wiring board 21 and the connector 22 has been described as two connection objects, but other objects to be connected include electronic components such as semiconductor devices.

  In this embodiment, the base sheet 31 is provided on the insulating sheet 3, but the base sheet 31 may be omitted.

FIG. 1 is a cross-sectional view of an electrical connection device according to an embodiment of the present invention. FIG. 2A is a cross-sectional view showing a state in which a thermosetting resin layer is formed on a base sheet. FIG. 2B is a cross-sectional view showing a state where through holes are formed in the insulating sheet. FIG. 2C is a cross-sectional view showing a state in which a conductive member and a hold-down member are formed in the through hole. FIG. 2D is a cross-sectional view showing a state where the release thin film is peeled off from the thermosetting resin layer. FIG. 3A is a cross-sectional view showing a state where the electrical connection device shown in FIG. 1 is arranged on a printed wiring board. FIG. 3B is a cross-sectional view illustrating a state in which the connector is disposed on the electrical connection device illustrated in FIG. 3A. 3C is a cross-sectional view showing a state where the electrical connection device shown in FIG. 3B is overheated at the melting point temperature of the hold-down member. FIG. 3D is a cross-sectional view showing a state where the connector is being pressed by a press. FIG. 3E is a cross-sectional view showing a state in which the operation of joining the printed wiring board and the connector is completed.

Explanation of symbols

1 Electrical connection device 3 Insulation sheet (insulator)
31 Substrate sheet 32 Thermosetting resin layer 5 Conductive member 7 Hold down member (metal part)
21 Printed wiring board (object to be connected)
211 Terminal section 212 Connection section 22 Connector (object to be connected)
221 Terminal 222 Connection

Claims (7)

In an electrical connection device that is arranged between two connection objects and mechanically and electrically connects the connection objects,
A sheet-like insulator having thermosetting properties for joining the two connection objects;
A columnar conductive member having a plurality of elasticity, which is provided in the insulator so as to penetrate from one surface to the other surface, and conducts between the terminal portions provided in each of the two connection objects. When,
A metal portion provided on the insulator, having a melting point lower than a curing temperature of the insulator, and welded to a connection portion provided on each of the two connection objects. Electrical connection device.   The electrical connection device according to claim 1, wherein the metal portion is columnar and penetrates from one surface of the insulator to the other surface.   The said insulator has the base material sheet which has a low thermal expansion coefficient and high tensile resistance, and the thermosetting resin layer arrange | positioned on both surfaces of this base material sheet, The Claim 1 or 2 characterized by the above-mentioned. Electrical connection device.   The electrical connection device according to claim 3, wherein a material of the base sheet is polyimide or aramid.   The electrical connection device according to claim 3 or 4, wherein the material of the thermosetting resin layer is an epoxy resin.   The electrical connection device according to claim 1, wherein the conductive member includes an elastic resin material and conductive metal particles mixed in the elastic resin material.   The electrical connection device according to claim 1, wherein the metal part is composed of a flux and conductive metal particles mixed in the flux.

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