JPH10125439A - Terminal connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal connection method for connecting a metal terminal to a flexible wiring board made of a resin sheet used for various electronic devices, and to use a solder or an anisotropic conductive adhesive at a connection portion between the two. It is an object of the present invention to provide a terminal connection method capable of stabilizing electrical connectivity without applying and fixing a reinforcing material such as the above. SOLUTION: A flexible margin 1F made of a resin sheet 1A having elasticity is provided with a bending margin 1F beside a terminal connection part 1D in which the surface is covered with a conductive layer 1B.
By crimping the metal terminal 2 to the terminal, the bending margin 1F is pressed and bent to the rear surface side to press the conductive layer 1B on the front surface against the terminal 2 surface, thereby making electrical contact.
Even without the reinforcing material, the electrical connection can be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal connecting method for connecting metal terminals to a flexible wiring board made of a resin sheet used for various electronic devices.

[0002]

2. Description of the Related Art As a conventional terminal connection method for connecting a metal terminal to a flexible wiring board made of a resin sheet, a method disclosed in Japanese Patent Application Laid-Open No. 5-21097 is known. The configuration will be described with reference to FIG.

FIG. 8 is a cross-sectional view of a connection portion in which metal terminals are connected to a conventional flexible wiring board. In FIG. 8, reference numeral 10 denotes a surface of a resin sheet 10A such as polyimide or polyethylene terephthalate by printing or the like. A flexible wiring board on which the conductive layer 10B is formed,
A terminal connection portion 10C whose surface is covered with the conductive layer 10B is formed by punching or the like.

A metal terminal 11 is connected to the terminal connecting portion 10C. The connecting method is as follows: the caulking portion 11A of the metal terminal 11 is bent inward and caulked.
A caulking portion 11A is formed on the conductive layer 10B on the surface of the terminal connection portion 10C.
The tip 11A1 is bitten into and mechanically connected and electrically connected, and a reinforcing material 12 such as conductive solder or anisotropic conductive adhesive is applied from above the caulking portion 11A. -By being fixed, the electric connection between the two was stabilized and mechanically reinforced.

[0005]

However, in the above-mentioned conventional terminal connection method, the reinforcing material 12 for stabilizing the electrical connection between the flexible wiring board 10 and the metal terminals 11 and the equipment for applying and fixing the same are provided. There is a problem that the cost is high because it is necessary and the man-hour (time) is required.

According to the present invention, there is provided a terminal connection capable of stabilizing electrical connection without applying and fixing a reinforcing material such as solder or an anisotropic conductive adhesive to a connection portion between a flexible wiring board and a metal terminal. It is intended to provide a method.

[0007]

In order to solve the above-mentioned problems, a terminal connecting method according to the present invention is directed to a method for connecting a terminal of a flexible wiring board made of an elastic resin sheet to a side of a terminal connecting portion having a surface covered with a conductive layer. By providing a bending margin and crimping a metal terminal to the terminal connection portion, the bending margin is pressed and bent to the back side, and the conductive layer on the surface is pressed against the terminal surface to make electrical contact.

[0008] This makes it possible to provide an easily connectable terminal connection method in which the electrical connection is stable even without the use of the reinforcing material.

[0009]

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, a concave punched hole is formed in a terminal connection portion provided by forming a conductive layer on a surface of a flexible wiring board made of an elastic resin sheet. Symmetrically opposed to each other to bend the recessed portions of the concave shape, and then a metal terminal provided with a caulking leg opposed to the terminal connection portion is fitted from the front side to form the two leg portions. By crimping so as to press against the back side of the flexible wiring board, the conductive layer formed on the surface of the flexible wiring board including the bending margin and the metal terminal were electrically connected. The conductive layer on the surface of the bending margin is pressed against the terminal surface by the elastic force of the bending margin of the terminal connection part of the flexible wiring board having the elasticity that is forcibly pushed and bent. Easily with stable effect that electrical connection is obtained between them.

According to a second aspect of the present invention, in the first aspect of the present invention, a round portion is provided at the base of a caulking leg of the metal terminal, and a bending margin is closely attached to the round portion. The conductive layer portion on the surface of the flat surface of the terminal connection part pressed by the tip of the leg of the terminal is firmly connected to the terminal surface, and the terminal connection part also comes into contact with the terminal surface by elastic force. Therefore, there is an effect that the electrical connection between the two is more stabilized.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the metal terminal is provided with a rib parallel to the caulking leg opposed to the center of the bottom of the metal terminal. By the rib, the center of the plane portion of the terminal connection portion of the flexible wiring board is pressed against the distal end sides of both legs of the metal terminal, and the contact pressure is locally increased, and the elastic force of the bending margin also acts more strongly. This has the effect that the electrical connectivity between them is further stabilized.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the terminal connection portion of the flexible wiring board is formed into a shape formed by a hole having a bending margin formed by a plurality of slits around the terminal connection portion. A hollow cylindrical caulking portion having an outer diameter larger than the hole and smaller than the outer periphery of the slit portion is provided in the metal terminal, and press-fitted from the surface of the terminal connection portion, and the tip of the hollow cylindrical caulking portion is curled outward. The tip is pressed so as to press the outside of the bending margin of the flexible wiring board, and has the same function as the invention according to claim 1, and the entire periphery of the metal terminal is swaged. Since it is held down by the front end of the base member, it has an effect that both can be firmly fixed with a small area.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the terminal connecting portion and the metal terminal of the flexible wiring board are provided with a rotation preventing engaging portion. In addition to the effect similar to that of the invention described in the fourth aspect, the present invention has an effect that the displacement of the metal terminal at the time of connection and after the connection can be restricted.

According to a sixth aspect of the present invention, in the first aspect of the present invention, a metal plating film having good conductivity is formed on the conductive layer of the terminal connecting portion. In addition, since the metal plating film having good conductivity is pressed against the terminal surface, there is an effect that the electrical connectivity between the two is further stabilized.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. (Embodiment 1) FIG. 1A is a plan view showing a state in which metal terminals are connected to a flexible wiring board using the terminal connection method according to the first embodiment of the present invention, and FIG. FIG. 2A is a cross-sectional view of a connection portion in the direction of the arrow AA in FIG. 2, FIG. 2 is a plan view of the flexible wiring board, and FIG.
(A) is a plan view of the metal terminal, and (b) is a front view of the same.

In FIG. 1, reference numeral 1 denotes a flexible wiring board in which a conductive layer 1B is formed on the surface of an elastic resin sheet 1A by printing or the like, and opposed concave holes 1C are formed by punching or the like. Accordingly, bending margins 1F are provided on both sides of the flat portion 1E of the terminal connection portion 1D whose surface is covered with the conductive layer 1B.

On the other hand, the metal terminal 2 has a flat bottom portion 2A having a width substantially equal to the flat portion 1E of the flexible wiring board 1.
Are provided on both sides of the crimping leg 2C, the base of which is a rounded portion 2B having a width substantially equal to the width of the bending margin 1F.

The metal terminal 2 constructed as described above
Is inserted into the concave hole 1C from the front surface side of the flexible wiring board 1 so that the bending margin 1F is forcibly pushed and bent along the radius 2B of the metal terminal 2, Next, in this state, the two leg portions 2C are swaged so as to be wound inward, and the terminal connection portions 1 of the flexible wiring board 1 are formed.
The rear surface of the flat part 1E of D is pressed down by the tip parts 2C1 of the two leg parts 2C to make a mechanical connection.

When the metal terminals 2 are connected to the flexible wiring board 1 in this manner, the two legs 2 of the metal terminals 2
In addition to the fact that the conductive layer 1B portion of the flexible wiring board 1 pressed by the tip 2C1 of C is electrically firmly connected to the bottom portion 2A of the metal terminal 2, in addition to the cross-sectional view of FIG. As shown in the figure, the bending margin 1F of the flexible printed circuit board 1 that has been forcibly pushed and bent also causes the conductive layer 1B on the surface to be pressed against the metal terminals 2 due to its elastic force, so that the flexible wiring board 1 makes electrical contact. In addition, the electrical connectivity between the two can be stabilized.

The shape and size of the bending margin 1F provided in the terminal connection portion 1D of the flexible wiring board 1 or the shape of the metal terminal 2 corresponding to the bending margin 1F are appropriately examined to determine the optimum one. Needless to say, it is good.

(Embodiment 2) FIG. 4 is a sectional view showing a state in which metal terminals are connected to a flexible wiring board by using a terminal connection method according to a second embodiment of the present invention, and FIG.
Is a plan view of the metal terminal, and FIG.
The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 1, reference numeral 1 denotes a flexible wiring board in which a conductive layer 1B is formed on the surface of a resin sheet 1A having elasticity.
Has a bending margin 1F on both sides of the plane portion 1E.

On the other hand, the metal terminal 3 has a flat bottom portion 3A having a width substantially equal to the flat portion 1E of the flexible wiring board 1.
On both sides of the base 3C, there is provided an opposing caulking leg 3C having a radius 3B having a width substantially equal to the width of the bending margin 1F, and a cross-sectional shape parallel to the caulking leg 3C opposing the center of the bottom 3A. The semicircular rib 3D is protruded.

When the metal terminal 3 configured as described above is caulked to the terminal connection portion 1D of the flexible wiring board 1, the flexible wiring board 1 is bent at the center along the rib 3D formed on the metal terminal 3 and caulked. The flat part 1E
The upper conductive layer 1B is locally pressed against the surface of the terminal 3 with a high pressure, and the bending margin 1F of the flexible wiring substrate 1 is also strongly pressed against the terminal 3 surface. The electrical connection is more stable.

As an example of the above description, the metal terminal 3
Although the cross-sectional shape of the rib 3D has been described as a semicircle, it may be of a triangular shape or the like, and if the width of the bottom 3A has room, a plurality of ribs 3D may of course be formed. .

(Embodiment 3) FIG. 6A is an exploded perspective view of a flexible wiring board and metal terminals for explaining a terminal connection method according to a third embodiment of the present invention, and FIG. It is sectional drawing for demonstrating the contact state of the bending margin of the same flexible wiring board, and the hollow cylindrical crimping part of a metal terminal.

In the same figure, reference numeral 4 denotes a flexible wiring board in which a conductive layer 4B is formed on the surface of an elastic resin sheet 4A by printing or the like, and the terminal connection portion 4C is formed by a plurality of slit portions 4D. Bend margin 4
It is composed of a round hole 4F having E around it and a square hole 4G provided independently.

The metal terminal 5 has a hollow cylindrical caulking portion 5A having an outer diameter larger than the outer diameter of the round hole 4F and smaller than the outer circumference of the slit portion 4D, and corresponds to the square hole 4G. The shape has a bent portion 5B at the position.

Then, the bent portion 5B of the metal terminal 5 is inserted into the square hole 4G and the hollow cylindrical caulked portion 5A is pressed into the round hole 4F from the surface side of the terminal connection portion 4C, and a plurality of bending margins 4E are respectively formed. The distal end portion 5A1 of the hollow cylindrical caulking portion 5A is curled outward around the circumference in this state, and is caulked to form a flexible wiring board. 4 bend margin 4E
Is pressed down and connected.

When both are connected in this way, FIG.
As shown in the sectional view of (b), the hollow cylindrical caulking portion 5A
The outer portion of the bending margin 4E pressed by the tip 5A1 is firmly electrically connected to the metal terminal 5, and the conductive layer 4B on the surface of the bending margin 4E also has a hollow cylindrical caulked portion of the metal terminal 5. Since it is pressed against 5A and is in electrical contact, the electrical connection between the two can be stabilized.

Further, since the bent portion 5B of the metal terminal 5 is inserted into the square hole 4G of the flexible wiring board 4,
It is possible to prevent misalignment at the time of connecting the flexible wiring board 4 and the metal terminals 5 and the like.

When the connection area is small, only the connection between the hollow cylindrical caulking portion 5A of the metal terminal 5 and the round hole 4F having the bending margin 4E of the flexible wiring board 4 around it can be performed electrically and electrically. The mechanical connection reliability can be sufficiently ensured.

(Embodiment 4) FIG. 7 is a sectional view showing a state in which metal terminals are connected to a flexible wiring board using a terminal connection method according to a fourth embodiment of the present invention. The same components are denoted by the same reference numerals, and detailed description is omitted.

In the figure, reference numeral 6 denotes a flexible wiring board in which a conductive layer 6B is formed on the surface of a resin sheet 6A having elasticity, and a conductive layer of a terminal connection portion 6E provided with bending margins 6C on both sides of a plane portion 6D. A metal plating film 6F made of good conductive gold or the like is formed on 6B.

Then, the metal terminal 2 is caulked to the terminal connection portion 6E of the flexible wiring board 6 to form a bending margin 6C on the side of the flat portion 6D of the terminal connection portion 6E.
Is electrically in contact with the metal terminal 2 because it is the same as described above.

With this configuration, the metal plating film 6F of good conductivity comes into contact with the metal terminal 2, so that the electrical connection between the two can be stabilized for a long time.

[0037]

As described above, according to the present invention, a flexible wiring board having elasticity is provided with a terminal connecting portion having a bending margin, and a metal terminal is connected to the terminal connecting portion to reduce the bending margin. Since the metal terminal is electrically contacted by the elastic force, the electric connection can be stabilized without reinforcing the connection portion with solder, anisotropic conductive adhesive, or the like.

[Brief description of the drawings]

FIG. 1A is a plan view showing a state in which metal terminals are connected to a flexible wiring board using the terminal connection method according to the first embodiment of the present invention; FIG. Sectional view of the connection part in the direction of the line arrow

FIG. 2 is a plan view of the flexible wiring board.

FIG. 3A is a plan view of the metal terminal, and FIG.

FIG. 4 is a cross-sectional view showing a state where metal terminals are connected to a flexible wiring board using the terminal connection method according to the second embodiment of the present invention;

FIG. 5A is a plan view of the metal terminal, and FIG.

FIG. 6 (a) is an exploded perspective view of a flexible wiring board and metal terminals for explaining a terminal connection method according to a third embodiment of the present invention. (B) Bending margin of the flexible wiring board and metal terminals. Sectional view for explaining the contact state with the hollow cylindrical caulking part

FIG. 7 is a cross-sectional view showing a state where metal terminals are connected to a flexible wiring board using the terminal connection method according to the fourth embodiment of the present invention.

FIG. 8 is a sectional view of a connection portion where a metal terminal is connected to a conventional flexible wiring board.

[Explanation of symbols]

 1,4,6 Flexible wiring board 1A, 4A, 6A Resin sheet 1B, 4B, 6B Conductive layer 1C Concave hole 1D, 4C, 6E Terminal connection 1E, 6D Plane 1F, 4E, 6C Bending allowance 2,3 , 5 Metal terminals 2A, 3A Bottom part 2B, 3B R part 2C, 3C Leg part for caulking 2C1, 5A1 Tip part 3D rib 4D Slit part 4F Round hole 4G Square hole 5A Hollow cylindrical caulking part 5B Bending part 6F Metal plating coating

Claims (6)

[Claims] The concave recess is provided by symmetrically opposing concave punched holes in a terminal connecting portion provided on a surface of a flexible wiring board made of an elastic resin sheet and having a conductive layer formed thereon. Each part is bent, and then a metal terminal provided with a caulking leg facing the terminal connection part is fitted from the front side, and the two legs are pressed against the back side of the flexible wiring board. A terminal connecting method for electrically connecting a metal terminal to a conductive layer formed on the surface of the flexible wiring board including the bending margin. 2. The terminal connection method according to claim 1, wherein a round portion is provided at the base of the caulking leg portion of the metal terminal, and a bending margin is closely attached to the round portion. 3. The terminal connection method according to claim 1, wherein a rib parallel to the caulking leg is provided at the center of the bottom of the metal terminal. 4. A terminal connecting portion of the flexible wiring board is formed into a shape having a hole around a bending margin formed by a plurality of slits, and the metal terminal is larger than the hole and smaller than the outer periphery of the slit. A hollow cylindrical caulking portion having a small outer diameter is provided, press-fitted from the surface of the terminal connection portion, and caulked so as to curl the distal end portion of the hollow cylindrical caulking portion outward, and the distal end portion bends the flexible wiring board. 2. The terminal connection method according to claim 1, wherein the outside of the terminal is pressed. 5. The terminal connection method according to claim 4, wherein the terminal connection portion and the metal terminal of the flexible wiring board are provided with a rotation preventing engagement portion. 6. The terminal connecting method according to claim 1, wherein a metal plating film having good conductivity is formed on the conductive layer of the terminal connecting portion.