JP3547698B2 - Electrical connection method, connection structure and connector between opposed electrodes - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electrical connection method, a connection structure, and a connector between opposed electrodes.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, electrical connection between electrodes of electronic members such as a surface mount LSI, a liquid crystal display panel, a plasma display, and an electronic circuit board uses a bonding agent such as ACF (Anisotropic, Conductive, Film: anisotropic conductive film). This is performed by a method of thermocompression bonding, or a method of electrically connecting the electrodes by arranging an elastic connector between the electrodes of the opposing electronic member and pressing them together.
[0003]
[Problems to be solved by the invention]
However, in the case of thermocompression bonding using ACF, accurate positioning between the electrode terminals of the electronic member is required, and the connection operation is not easy.
Further, destruction of electronic members due to thermocompression, for example, in a COG (Chip-On-Glass) type liquid crystal, a load is applied to a liquid crystal display panel or a liquid crystal driving IC due to residual stress caused by thermocompression. In addition, the ACF joining the liquid crystal driving IC may be softened by the heat of the thermocompression bonding, and a problem may occur in the connection of the liquid crystal driving IC.
In addition, by setting the temperature of the thermocompression bonding to be low, it is possible to avoid the occurrence of such a problem, but in this case, there is a possibility that a sufficient adhesive strength cannot be obtained.
Also, once thermocompression bonding is performed, peeling is extremely difficult. For example, in a display test of a liquid crystal display panel, when a display defect not caused by the liquid crystal display panel, such as a connection failure or an FPC failure, occurs, There is also a problem that, despite good quality, repair cannot be performed and the expensive liquid crystal display panel must be discarded.
Further, in the case of the method of pressure contact using an elastic connector, although peeling can be performed, there is a problem that accurate positioning of the connector with respect to the electrode is not easy and productivity does not increase.
[0004]
An object of the present invention is to solve the problems of cost and yield, such as destruction and overload of electronic members due to a thermocompression bonding process such as ACF and disposal of expensive electronic members, and to perform connection work between electronic members simply and easily. It is an object of the present invention to provide a connection method and a connector for the connection method.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention employs the following means.
The invention according to claim 1 is an electrical connection method for connecting each electrode of the electronic member facing each other using a connector, wherein the connector is configured by integrating an elastic connector and a clip member. And by clipping the outside of one electrode portion of the electronic member with the clip member, one end of the elastic connector is brought into contact with the electrode portion of the electronic member, and the other end of the elastic connector is connected to the other end. The electrodes of the electronic member are brought into contact with each other, the elastic connector is compressed by these electronic members, and the opposing electrodes of the electronic member are electrically connected.
[0006]
The invention according to claim 2 is a connector for electrically connecting between respective electrodes of the opposing electronic member, wherein the connector has electrodes formed on both sides of the elastic member, and the electrodes on both sides are respectively provided. The conductive elastic connector and the elastic connector are integrated, and the outside of one electrode portion of the electronic member is clipped so that the electrode of the elastic connector and the electrode of the electronic member come into contact with each other. Wherein the elastic connector preferably includes an insulating elastomer having a substantially X-shaped cross section and an arm extending substantially in the X shape of the insulating elastomer. And a conductive wire extending from one end of the front surface to the end of the back surface of another opposing arm having the center point of the X-shape as a substantially symmetrical point.
[0007]
According to a third aspect of the present invention, a pair of electronic members are opposed to each other so that the electrodes are opposed to each other, and the connector according to the second aspect is interposed between the electrodes to electrically connect the electrodes. This is the connection structure.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the connector according to the present invention will be described.
The connector according to the present invention is a connector in which a pair of electronic members are opposed to each other to electrically connect the opposed electrodes (electrode terminals). A conductive elastic connector, and a clip formed integrally with the elastic connect so that when the outside of the electrode portion of the electronic member is clipped, the electrode of the elastic connector comes into contact with the electrode of the electronic member. And a member. Examples of electronic members to which this connector is used include a surface mount LSI, a liquid crystal display panel, a plasma display, and an electronic circuit board. Hereinafter, a case where one of the electronic members is a liquid crystal display panel and the other is a circuit board will be described. I do.
[0009]
FIG. 1 is a longitudinal sectional view of a liquid crystal display device 100 in which a connector 10 according to an embodiment of the present invention is used for electrical connection between electrodes of a liquid crystal display panel and a circuit board, and FIG. 2 is an exploded perspective view thereof. is there.
In the figure, 101 is a circuit board, 102 is a liquid crystal display panel, 103 is a backlight LED, 104 is a light guide for guiding the light of the backlight LED 103 to the back of the liquid crystal display panel 102, 105 is a shield case, 106 is This is a liquid crystal driving IC. Reference numeral 101a denotes an electrode terminal formed on the circuit board 101, reference numeral 102a denotes an electrode terminal formed on the liquid crystal display panel 102, and the connector 10 electrically connects the electrode terminals 101a and 102a.
[0010]
The connector 10 integrates a pressure contact type (elastic body) connector 12 and a metal clip member 14, and attaches and holds the pressure contact type connector 12 to the electrode terminal 102 a of the liquid crystal display panel 102 by the metal clip member 14. The electrical connection is made by compressing the connector 12 between the liquid crystal display panel 102 and the circuit board 101. Details of the connector 10 will be described in a first embodiment.
[0011]
The press-connecting connector used for connection may be selected according to the magnitude of the driving current of the liquid crystal display panel. For example, when the driving IC for the liquid crystal display panel is mounted on the circuit board side and the current input to the liquid crystal display panel is small. Since a large current capacity is not required for the connector itself, a rubber connector 62 as shown in FIG. 6 may be used, and a liquid crystal driving IC is directly mounted on the liquid crystal display panel like a COG type liquid crystal display panel. When a relatively large current is required, the rubber connector has a high resistance value and a small current capacity, so it is easy to generate heat due to the current, and signal delay or loss occurs. Not preferred.
[0012]
Therefore, a crimping type connector having a large current capacity using a material obtained by processing a metal foil into a linear shape or a metal wire, such as an X-type connector 12 shown in FIG. 1 and a thin U-shaped metal wire shown in FIG. The connector 32 or the thin metal wire connectors 42 and 52 shown in FIGS. 4 and 5 may be used.
[0013]
The thin metal wire connector 52 is formed by laminating metal wires 52c arranged at a constant pitch between insulating elastomers 52a and 52b so that the direction of the metal wires 52c is constant, and after slicing the products, cutting them into appropriate dimensions. This is a thin metal wire matrix type connector 52, which may be used instead of the thin metal wire connector 42.
Recently, the liquid crystal display panel has been made thinner and lighter, and the strength of the liquid crystal display panel itself has been reduced.
Therefore, when a press-connecting connector is used, it is necessary to connect with a low compressive load. Therefore, it is most preferable to use the X-type connector 12, which can suppress the compressive load at the time of connection low.
[0014]
When using a product obtained by processing a metal foil into a striatum for a press-fit connector, the material is copper, aluminum, aluminum-silicon alloy, brass, phosphor bronze, beryllium copper, nickel, nickel-titanium alloy, molybdenum, tungsten , Stainless steel, iron, an iron-carbon alloy, or the like, and it is desirable to apply a plating process of gold or a gold alloy to the surface thereof.
In particular, stainless steel plated with gold is most desirable because it has low contact resistance and has the resiliency of the material itself, so that it is excellent in preventing buckling of the connector, repetitive compressibility, and keeping costs low.
At this time, the thickness of the metal foil is 0.01 to 0.5 mm, preferably 0.02 to 0.5 mm.
If the thickness is less than 0.01 mm, the material itself does not have sufficient strength, the durability of the product is poor, and the hand linkability at the time of molding is poor.
If it is 0.5 mm or more, the rigidity of the material is too high, and it is difficult to keep the connection load low, and the workability is reduced.
[0015]
As a method of processing the metal foil into a conductive wire having a constant pitch, etching, laser, punching by a stamping press, or the like can be used.
When pitch accuracy is required and the connection electrode width is narrow, for example, at a pitch of 0.03 to 0.5 mm, the metal foil is preferably processed to a predetermined pitch by etching.
Conversely, when the width of the connection electrode is wide, for example, at a pitch of 0.5 to 2.0 mm, using a method of processing to a predetermined pitch with a laser, punching by a stamping press, or the like is advantageous in terms of mass productivity and cost.
[0016]
When a metal wire is used for a press-fit connector, the material is gold, gold alloy, copper, aluminum, aluminum-silicon alloy, brass, phosphor bronze, beryllium copper, nickel, nickel-titanium alloy, molybdenum, tungsten, Stainless steel, iron, an iron-carbon alloy, or the like can be used, and it is preferable to apply a plating process of gold or a gold alloy on the surface of a material other than gold or a gold alloy.
[0017]
A metal wire having a diameter of about 0.01 mm to 0.5 mm can be used. If the diameter is less than 0.01 mm, the workability is poor because the strength of the wire itself is low. Therefore, the diameter is most preferably in the range of 0.02 mm to 0.1 mm because the strength becomes too high and the contact pressure when the connector is used becomes too high.
[0018]
When a rubber connector is used as the press contact type connector, a press contact type rubber connector in which a conductive elastomer and an insulating elastomer are alternately laminated and a support material made of a pair of insulating elastomers is provided on the non-pressing surface side.
The insulating elastomer used for the rubber connector is preferably an elastic and insulating elastomer member. Silicone rubber, polybutadiene rubber, natural rubber, polyisoprene rubber, urethane rubber, chloroprene rubber, polyester rubber, styrene-butadiene Non-foamed materials such as copolymer rubber and epichlorohydrin rubber, or foamed materials thereof can be used.
Among them, it is most desirable to use silicone rubber which is excellent in electric insulation, heat resistance and compression set.
[0019]
In addition, the conductive elastomer is obtained by adding a conductive material such as carbon, graphite, gold, silver, copper, and nickel, or a powder, a microsphere, and a flaky material obtained by plating these materials to the various elastomer materials described above. Can be used. As for the rubber strength of the insulating and conductive elastomer members, when the rubber hardness is low, a low contact pressure can be obtained, but permanent distortion due to compression and sag due to heat are likely to occur.
Further, a material having a high rubber hardness has a high contact pressure.
Therefore, as an elastomer member having a low contact pressure and a small permanent set, it is desirable to use a silicone rubber having a rubber hardness of 10 to 70 ° H, preferably 30 to 60 ° H.
[0020]
For the metal clip member, a material such as copper, aluminum, aluminum-silicon alloy, brass, phosphor bronze, perylium copper, nickel, nickel-titanium alloy, molybdenum, tungsten, stainless steel, iron, iron-carbon alloy, etc. may be used. Although it is possible, in consideration of the function as a clip, it is preferable to use a material having a high spring property. Among them, stainless steel is most desirable because of its excellent spring property, workability, and cost.
[0021]
The shape of the metal clip member varies depending on the size and thickness of the liquid crystal display panel, the size and type of the press-connecting connector used, and so on. At least one or more portions (clip portions) for holding and fixing to the display panel are preferably provided in the metal clip member at two or more positions in consideration of the fixing strength to the liquid crystal display panel and the like. It is desirable that the length of the metal clip member is the same as the length of the liquid crystal display panel used.
This is because positioning can be easily performed only by aligning the position of the end face of the liquid crystal display panel with the lengthwise end face of the metal clip member, and workability is improved.
[0022]
The shape of the clip portion is preferably such that the substantially cross-sectional shape is like “C” or “C” from the viewpoint of workability of the metal member, ease of holding and fixing to the liquid crystal display panel terminal portion, and the like. Any shape can be used as long as it can hold and fix the outside of the electrode terminal portion of the liquid crystal display panel.
At this time, it is desirable to slightly bend the end of the opening of the clip portion in the direction in which the clip expands or to turn it back in the direction in which the clip closes, since attachment to the liquid crystal display panel terminal portion becomes easy.
In the above description, the portion to be clipped by the metal clip member is the liquid crystal display panel. However, the same can be performed by clipping the circuit board side.
[0023]
【Example】
(Example 1)
A method of manufacturing the connector 10 shown in FIGS.
A 30 mm × 100 mm, 50 μm thick stainless steel plate was etched with a slit of 0.07 mm pitch and a conductor length of 10 mm, leaving a 10 mm outer peripheral frame, and this was plated with nickel undercoat and surface gold. .
A silicone rubber having a rubber hardness of 50 ° H after curing was filled in a mold for molding an elastomer support, and this was pressurized and heated at 120 ° C for 5 minutes to obtain substantially V-shaped silicone rubber supports 12a and 12b. Incidentally, these silicone rubber supports 12a and 12b correspond to the first and second support elastic bodies in the present invention.
[0024]
A silicone-based adhesive is applied to the silicone rubber support obtained above to a thickness of 20 μm, and the two adhesives and the stainless steel plate are bonded to a bonding jig so as to be point-symmetric with respect to the center of the length of the conductor member. After setting, pressurizing and heating at 120 ° C. for 5 minutes to cut and remove unnecessary frame portions and slit portions from the formed molded body to form the conductive wire 12c, and further, about 15 mm in the slit pitch direction. To about 1.5 mm in width, 1.5 mm in height and 15 mm in length as shown in FIGS.
[0025]
Next, a stainless steel plate having a thickness of 100 μm is punched into a developed shape of a metal clip member by press working, and then bent into a predetermined shape to have a length of about 40 mm, a width of about 2.5 mm, and a height of about 2 mm. A metal clip member 14 having a length of 0.0 mm and a clip portion having a substantially U-shaped cross section at both ends in the length direction.
The X-type connector 12 was attached to the product, and the X-type connector 12 was attached. The X-type connector 12 was heated and fixed at 120 ° C. for 10 minutes to obtain an X-type connector 10 having a metal clip member.
This product was attached to the terminal part of the COG type liquid crystal display panel using the clip part of a metal clip member, and was compressed between the circuit board. As a result, the liquid crystal display panel turned on normally and stable conduction was obtained. Was confirmed.
[0026]
(Example 2)
A method for manufacturing the connector 30 shown in FIG. 3 will be described.
The brass wire 32c having a diameter of 40 μm and having a nickel plating undercoat and a surface gold plating is arranged at regular intervals at a pitch of 0.1 mm on an uncured silicone rubber having a rubber hardness of 50 ° H and a thickness of 100 μm after curing. It was heated and cured at 120 ° C. for 30 minutes, and further cut at a length of about 9 mm in a direction perpendicular to the arrangement direction of the brass wires 32c.
Next, the brass wire 32c was pushed into the outer surface of a U-shaped groove of about 3 mm in width and about 2 mm in depth, which was dug into a jig, and was further foamed into a sponge shape by heating. After filling with uncured silicone rubber 32a having a rubber hardness of 20 ° H, covering with a lid, heating, foaming, and curing at 120 ° C for 5 minutes, take out, and take a length of about 10 mm in the brass wire arrangement direction. Into a metal thin wire U-shaped connector 32 having a width of about 2 mm, a height of about 3 mm, and a length of about 10 mm.
[0027]
Next, a stainless steel plate having a thickness of 100 μm is punched into a developed shape of a metal clip member by press working, and then bent into a predetermined shape to be about 30 mm long, about 2.5 mm wide, and about 2 mm high. A metal clip member 34 having a length of 0.0 mm and a clip portion having a substantially U-shaped cross section at both ends in the length direction.
A silicone adhesive is applied to this material, the metal thin wire U-shaped connector 32 is attached, and heated and fixed at 120 ° C. for 10 minutes to bond and fix the metal thin wire U-shaped connector 30 with a metal clip member. Obtained.
This product was attached to the terminal portion of the COG type liquid crystal display panel using the clip portion of the metal clip member 34 and compressed between the circuit board and the liquid crystal display panel turned on normally, and stable conduction was achieved. It was confirmed that it could be obtained.
[0028]
(Example 3)
A method for manufacturing the connector 40 shown in FIG. 4 will be described.
Brass wires 42c having a diameter of 30 μm and having a base nickel plating and a surface gold plating are arranged at regular intervals at a 0.05 mm pitch on an uncured silicone rubber having a rubber hardness of 30 ° H. and a thickness of 100 μm after curing. Thereafter, an uncured silicone rubber having a rubber hardness of 30 ° H and a thickness of 100 µm is stuck on the arranged brass wires 42c, and the material is heated and cured at 120 ° C for 30 minutes, and a silicone-based adhesive is applied to both surfaces of the material. It is applied in a thickness of 20 μm, silicone rubber plates (support materials) 42a and 42b each having a thickness of about 0.9 mm and a rubber hardness of 30 ° H are adhered to each other, and further heated and cured at 120 ° C. for 10 minutes. About 20mm in the direction of arrangement and about 5mm in the direction perpendicular to the arrangement direction of the brass wire to form a thin metal wire connector 42 with a length of about 20mm, a width of about 2mm and a height of about 5mm. .
[0029]
Then, after punching out a stainless steel plate having a thickness of 80 μm into a developed shape of a metal clip member by press working, and bending it into a predetermined shape, the length is about 30 mm, the width is about 3 mm, and the height is about 3 mm. The metal clip member 44 has a clip portion having a substantially C-shaped cross section at both ends in the length direction.
A silicone adhesive was applied to this product, and the metal thin wire connector 42 was attached thereto. The wire was heated and fixed at 120 ° C. for 10 minutes to obtain a metal thin wire connector 40 with a metal clip member.
This product was attached to the terminal part of the COG type liquid crystal display panel using the clip part of a metal clip member, and was compressed between the circuit board. As a result, the liquid crystal display panel turned on normally and stable conduction was obtained. Was confirmed.
[0030]
(Example 4)
A method for manufacturing the connector 50 shown in FIG. 5 will be described.
A brass wire 52c having a diameter of 40 μm and having a base nickel plating and a surface gold plating is arranged at regular intervals at a pitch of 0.2 mm on an uncured silicone rubber 52a having a rubber hardness of 50 ° H and a thickness of 100 μm after curing. After curing, an uncured silicone rubber 52b having a rubber hardness of 50 ° H and a thickness of 100 μm is stuck on the arranged brass wires 52c, and the material is heated and cured at 120 ° C. for 30 minutes. After aligning the brass wires in the same direction and bonding them together, further heat and cure them at 120 ° C for 10 minutes, cut them into about 2.5 mm in a direction perpendicular to the brass wire array direction, and further lengthen the material. It was cut into a length of about 15 mm and a width of about 2 mm to obtain a metal wire matrix connector 52 having a length of about 15 mm, a width of about 2 mm, and a height of about 2.5 mm.
[0031]
Next, a 100 μm-thick stainless steel plate is punched out in a developed shape of a metal clip member by press working, and then bent into a predetermined shape to have a length of about 25 mm, a width of about 3 mm, and a height of about 3 mm. The metal clip member 54 has a clip portion having a substantially C-shaped cross section at both ends in the length direction.
A silicone adhesive was applied to this product, and the metal wire matrix type connector 52 was attached. The connector was heated and fixed at 120 ° C. for 10 minutes to obtain a metal wire matrix type connector 50 with a metal clip member. .
This product was attached to the terminal part of the COG type liquid crystal display panel using the clip part of a metal clip member and compressed between the circuit board and the liquid crystal display panel turned on normally, and stable conduction was obtained. Was confirmed.
[0032]
(Example 5)
A method for manufacturing the connector 60 shown in FIG. 6 will be described.
An insulating silicone rubber 62a having a thickness of 50 μm and a conductive silicone rubber 62c having a thickness of 50 μm are alternately laminated, and the product is cut at a thickness of 0.6 mm in a direction perpendicular to the laminating direction. An adhesive is applied to a thickness of 20 μm, and a silicone rubber plate (support material) 62b having a thickness of about 0.93 mm and a rubber hardness of 20 ° H. is adhered thereto, and heated and cured at 140 ° C. for 10 minutes. It is cut into a size of about 30 mm in the laminating direction of the silicone rubber and the conductive silicone rubber and about 3 mm in a direction perpendicular to the laminating direction, to obtain a rubber connector 62 having a length of about 30 mm, a width of about 2.5 mm, and a height of about 3 mm. .
[0033]
Then, after punching out a stainless steel plate having a thickness of 100 μm into a developed shape of a metal clip member by pressing, and bending it into a predetermined shape, the length is about 45 mm, the width is about 3 mm, and the height is about 3 mm. The metal clip member 64 has a clip portion having a substantially C-shaped cross section at both ends in the length direction.
A silicone-based adhesive was applied to the product, and the rubber connector was attached and heated and bonded at 120 ° C. for 10 minutes to obtain a rubber connector 60 with a metal clip member.
When this product was attached to the liquid crystal display panel terminal portion using the clip portion of a metal clip member and compressed between the circuit board, the liquid crystal display panel turned on normally, and stable conduction was obtained. confirmed.
[0034]
In the above embodiments and examples, a metal member is used as the clip member, but other members such as plastic may be used as long as they have the same effect.
In the above-described embodiment, the connector 10 is used to connect the opposing electrodes between the liquid crystal display panel and the circuit board. However, as described at the beginning, the electronic member using this connector is a surface mount type. There are various types such as LSIs, liquid crystal display panels, plasma displays, and electronic circuit boards.
[0035]
【The invention's effect】
As described above, according to the present invention, since a thermocompression bonding step of ACF or the like is not required, destruction of an electronic member due to thermocompression can be prevented, and a connection operation between opposing electrodes of the electronic member uses a clip. As a result, it is possible to carry out extremely easily, and the production capacity is improved.
In addition, even if a defect occurs in one of the electronic members, repair can be performed easily and easily, and the problem that the other expensive electronic member that is a good product must be discarded can be solved. large.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a liquid crystal display device using a connector according to an embodiment of the present invention for connecting a liquid crystal display panel to a circuit board.
FIG. 2 is an exploded perspective view of the liquid crystal display device shown in FIG.
3A and 3B show a second embodiment of the connector, wherein FIG. 3A is an exploded view and FIG. 3B is an assembly view.
4A and 4B show a third embodiment of the connector, wherein FIG. 4A is an exploded view and FIG.
FIG. 5 shows a fourth embodiment of the connector, wherein (a) is an exploded view and (b) is an assembled view.
FIG. 6 shows a fifth embodiment of the connector, wherein (a) is an exploded view and (b) is an assembled view.
[Explanation of symbols]
10, 30, 40, 50, 60 Connectors 12, 32, 42, 52, 62 Press-fit (elastic) connectors 12c, 32c, 42c, 52c Fine metal wires (conductive wires)
14, 34, 44, 54, 64 Metal clip member 100 Liquid crystal display device 101 Circuit board 101a Electrode terminal 102 Liquid crystal display panel 102a Electrode terminal

Claims (3)

An electrical connection method for connecting between respective electrodes of opposing electronic members using a connector,
The connector, together with formed by integrating an elastic body connector and the clip member, the one electrode portion outside of said electronic member by the clipping by the clip member, said one end of the elastic body connector is brought into contact with the electrode portion of the electronic member, the other end of the elastic body connector by contacting the electrode of the other electronic components, the elastic connector is compressed by these electronic components, between opposing electrodes of the electron member electrical connection between the opposing electrodes, characterized by electrical connecting. A connector for electrically connecting between respective electrodes of the opposing electronic member ,
Clip the connector, electrodes are formed on both sides of the elastic member, the elastic body connector between the two sides of the electrode is conductive, respectively, are integrated with the elastic body connector, the one electrode portion outside of said electronic member connectors by, characterized in that the electrodes of the elastic body connector electrode and the electronic member and a clip member configured to abut to. A connection structure for electrically connecting each electrode of the first and second electronic members disposed to face each other using a connector,
The connector is formed by integrally forming an elastic connector and a clip member, each of which is electrically connected between electrodes on both sides of an elastic member having electrodes formed on both sides, and the clip member is formed as an electrode of a first electronic member. The electrode of the first electronic member is brought into contact with the electrode of the elastic connector by clipping outside the portion, and the elastic connector is interposed between the first and second electronic members to electrically connect the opposing electrodes. electrical connection structure between opposing electrodes, characterized in that it has a structure to be connected.

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