JP2003272730A - Film-like circuit board integrated elastic connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film-like circuit board integrated elastic connector exerting adhesiveness to an electrode with a small load and coping with simplification of a process, reduction of the production cost, miniaturization of an apparatus and an environmental problem is mounting it without requiring a socket provided with a metal leaf spring needing a lot of space of without wearing a terminal of a film-like circuit board led out from an electrode surface of an electronic component. <P>SOLUTION: This film-like circuit board integrated elastic connector is composed by forming, integrally with the terminal of a film-like circuit board, an anisotropic conductive connector forming a conductive part by arranging a conductive medium in an insulating rubber-like elastic body. For the film-like circuit board integrated elastic connector, the film-like circuit board is molded integrally with the anisotropic conductive connector in a die. In the film-like circuit board integrated elastic connector, the conductive part is formed by orienting the conductive medium by magnetic force in the rubber-like elastic body, and the conducting end face of the conductive part is formed into a projecting shape. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component incorporated in an electronic device such as a mobile terminal, a personal computer, a digital camera, a digital video camera, an electronic game machine, for example, an EL display device (electroluminescence display device),
An elastic connector integrated with a film-shaped circuit board that electrically connects the terminals of the film-shaped circuit board, which are derived from the electrode surface of a liquid crystal display panel, membrane switch, solar cell, etc., with the electrodes of the opposing board. It is about.

[0002]

2. Description of the Related Art As shown in FIG.
The terminal 2 of the film-like circuit board 1 derived from the electrode surface of an electronic component used in an electronic device such as a personal computer and a digital camera, for example, an EL display device, a liquid crystal display plate, a membrane switch, a solar cell is a resin. By being inserted into the formed socket 11 from the side indicated by the arrow, it is electrically connected to the electrode of the opposing substrate. In the socket, a large number of metal leaf springs are arranged corresponding to the terminals 2 of the film-shaped circuit board 1 for electrical connection.

[0003]

However, a metal leaf spring requires a thickness of the leaf and a length of the spring to obtain the required spring characteristics, and since the socket is required to have rigidity, it is small in size. There is a limit to conversion. Therefore, it requires a lot of space and cannot meet the needs for downsizing and thinning of electronic devices. In addition, the socket and the board of the electronic device,
Since they are connected by soldering, the productivity is poor and the manufacturing cost is high. And connection using solder tends to be shunned due to recent environmental problems.

Further, the terminals of the film-like circuit board led out from the electrode surface of the electronic component may be rubbed against the leaf springs and worn when the terminals are inserted into the socket. If the terminals on the circuit board are made of conductive ink that is susceptible to wear,
Since it is necessary to separately provide a hard metal terminal, the productivity is poor and the manufacturing cost is high. In addition, even when a hard metal is used for the terminal, wear occurs as the terminal is repeatedly inserted and removed, which causes poor contact.

Furthermore, as described in Japanese Patent Application Laid-Open No. 9-318968, when connecting to a film-like circuit board in a liquid crystal display device or the like, a conductive portion and an insulating portion made of a rubber-like elastic body alternate. There is one in which a compression conductive type elastic connector laminated on the above is used by being held by its elastic restoring force. But,
Since it is a separate component from the film-like circuit board and the opposing board, it is necessary to perform detailed work such as positioning of the elastic connector when mounting.

In addition, this elastic connector is subjected to a step of laminating thin conductive rubber and insulating rubber in multiple layers and integrally molding, a step of cutting at right angles to the layers to form a sheet, and a step of further cutting into a product shape. Since it is manufactured, the number of steps is large and the manufacturing cost is high. Further, the shape of the elastic connector obtained is only a simple shape such as a rectangular parallelepiped, and it has been difficult to obtain an elastic connector or the like in which a conductive portion is provided in a convex shape to have a load reducing effect.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above problem by integrating an anisotropic conductive connector with a film-like circuit board, and requires a large space for a metal leaf spring. Does not require a socket equipped with, and does not abrade the terminals of the film-like circuit board drawn out from the electrode surface of the electronic component, and the adhesion with the electrode can be obtained under a low load, and the electrodes of each other can be attached when mounting. It is possible to provide an elastic connector integrated with a film-like circuit board, which does not need to be positioned, and which simplifies the process, reduces the production cost, downsizes the device, and copes with environmental problems.
Further, it is also possible to form a thin conductive rubber of 1 mm or less by orienting the conductive medium to a desired position in the insulating rubber-like elastic body by magnetic force at the same time as molding to form a conductive portion. It can be made smaller and thinner.

That is, according to the present invention, a film-shaped circuit in which an anisotropic conductive connector for forming a conductive portion by arranging a conductive medium in an insulating rubber-like elastic body is integrally formed with a terminal of a film-shaped circuit board. This is a board-integrated elastic connector.
Furthermore, the film circuit board and the anisotropic conductive connector
It is a film-shaped circuit board integrated elastic connector integrally molded in a mold. Further, the conductive portion is a film-shaped circuit board integrated elastic connector in which a conductive medium is oriented by magnetic force in a rubber-like elastic body.
Further, the conductive end face of the conductive portion is a film-shaped circuit board integrated elastic connector in which the conductive end face is formed in a convex shape.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A film-shaped circuit board integrated elastic connector of the present invention will be described below with reference to the drawings. Figure 1,
2 is a perspective view and a longitudinal sectional view showing an embodiment of the present invention. The present invention is a film-shaped circuit board-integrated elastic connector in which an anisotropic conductive connector 3 is integrally formed on a terminal 2 of a film-shaped circuit board 1, and is mounted on an electrode 8 of a mating board 7 or the like. It is assembled by pressing.

As a method for integrally forming the film-like circuit board and the anisotropic conductive connector, for example, in-mold integral molding, heat fusion, ultrasonic fusion, welding, adhesion with an adhesive,
Adhesion with a double-sided tape, insertion of a film-shaped circuit board into a slit provided in the anisotropic conductive connector, geometrical connection by engagement or the like, or other methods can be used. Above all, the film-shaped circuit board is inserted into the mold for molding the anisotropic conductive connector, and then the anisotropic conductive connector is molded and integrated at the same time. Can and is most preferred.

In the anisotropic conductive connector 3 molded into a desired shape in the molding die, the conductive medium 4 is properly connected to the terminal 2 of the film-like circuit board led out from the electrode surface of the electronic component. The conductive portion 5 is formed on the. As a method of forming the conductive portion 5, for example, the anisotropic conductive connector 3 is formed, and at the same time, the conductive medium 4 is oriented by magnetic force to a desired position in the insulating rubber-like elastic body. As shown in FIG. 3, the conductive portion 5 of the anisotropic conductive connector 3 has the conductive medium 4
Are arranged to form a conduction path.

The insulating rubber-like elastic body used in the anisotropic conductive connector 3 of the present invention includes silicone rubber, natural rubber, isoprene rubber, butadiene rubber, 1,2-polybutadiene, styrene-butadiene rubber, chloroprene rubber, Nitrile rubber, butyl rubber, ethylene-propylene rubber, chlorosulfonated polyethylene, acrylic rubber,
Epichlorohydrin rubber, fluororubber, urethane rubber,
Styrene-based thermoplastic elastomer, olefin-based thermoplastic elastomer, ester-based thermoplastic elastomer, urethane-based thermoplastic elastomer, amide-based thermoplastic elastomer, vinyl chloride-based thermoplastic elastomer, fluorinated-based thermoplastic elastomer, ion-crosslinked-based thermoplastic elastomer Etc. Above all, silicone rubber is preferable from the viewpoint of electrical insulation and weather resistance.

The conductive medium 4 of the anisotropic conductive connector 3 of the present invention is preferably a magnetic conductive medium having a low electric resistance. The electric resistance of the conductive medium is preferably 1 Ω or less, and for example, particles, fibers, thin wire-shaped magnetic conductive medium made of metal or ceramic, etc. are used. Specifically, nickel, cobalt, iron, ferrite or alloys containing a large amount thereof are preferable, and gold, silver, platinum, aluminum, nickel, copper, iron, palladium, cobalt, chromium and the like having good conductivity are also used. It is possible to use metal or alloy such as stainless steel, or powder or fine wire made of resin, ceramic or the like plated with a magnetic conductor, or conversely, a magnetic conductor plated with a metal of a good conductor.

The present invention will be described in more detail with reference to the following examples.

Embodiment 1 FIGS. 1 and 2 show a perspective view and a sectional view of this embodiment. In this embodiment, the film-shaped circuit board 1 is inserted into the mold for molding the anisotropic conductive connector 3 and then the anisotropic conductive connector 3 is molded and integrated at the same time as a film obtained by integral molding in the mold. Circuit board integrated elastic connector.

The conductive medium 4 of the anisotropic conductive connector 3 includes:
Nickel particles, which are magnetic conductors, were used, and silicone rubber was used as the insulating rubber-like elastic body. The conductive medium 4 is formed with the conductive portion 5 in a shape suitable for connecting to the eight terminals 2 exposed at the end of the film-shaped circuit board 1. After the film-shaped circuit board 1 is inserted into the molding die of the anisotropic conductive connector 3, a composition in which nickel particles are mixed with liquid uncured silicone rubber is separately injected into the molding die, A magnetic force is applied to the columnar shape from the top and bottom of the mold to orient the nickel particles in the magnetic field to form the conductive portion 5, and the silicone rubber is vulcanized and cured to form the anisotropic conductive connector 3 in the film-shaped circuit board 1. Integrally molded into.

[0016]

[Embodiment 2] FIG. 4 shows a sectional view of another embodiment. In this embodiment, the conductive portion 5 of the anisotropic conductive connector 3 has a shape in which the conductive end face 12 with the opposing substrate 7 is formed in a convex shape, and the contact area with the substrate electrode 8 is reduced to reduce the contact load. The film-shaped circuit board integrated elastic connector having the same configuration as that of the first embodiment except the above. According to this embodiment, a stable electrical connection can be achieved with a substrate electrode under a low load.

[0017]

[Embodiment 3] FIG. 5 shows a sectional view of an embodiment of a method for integrally forming a film-shaped circuit board and an anisotropic conductive connector.
In this embodiment, the anisotropic conductive connector 3 is provided with the engaging projection 9 and is inserted into the insertion hole 10 provided in the film-shaped circuit board 1 to be locked and integrally formed. Is. Since the anisotropic conductive connector 3 is molded at once with a molding die, the engaging protrusion 10 can be formed more easily than a conventional laminated elastic connector. Further, even if the anisotropic conductive connector 3 and the film-shaped circuit board 1 are made of a material that cannot be chemically integrated, such as adhesion or fusion, they are integrated because they are connected in shape. be able to.

[0018]

EFFECTS OF THE INVENTION The film-shaped circuit board integrated elastic connector of the present invention does not require a socket provided with a metal leaf spring, which requires a lot of space, and wears the terminals of the film-shaped circuit board. Since it is not present, contact stability can be achieved and the electrode can be brought into close contact with a low load. Furthermore, since the anisotropic conductive connector is integrated with the film circuit board, it is easy to install, and since there is no step of connecting by soldering, it also corresponds to environmental problems, and the number of parts and assembly Since the man-hours can be reduced, the manufacturing cost can be reduced and the device can be downsized.

Further, since the elastic connector to be used is processed into a desired shape in the molding die, and at the same time, the conductive medium can be oriented to the desired position in the insulating rubber-like elastic body by the magnetic force to form the conductive portion. The size can be 1 mm or less, and there is flexibility in the shape, and a shape corresponding to the miniaturization of the device, a shape in consideration of the reduction of the load, an engaging protrusion for locking, etc. can be easily formed.

[Brief description of drawings]

FIG. 1 is a film-shaped circuit board integrated elastic connector of the present invention.

FIG. 2 is a vertical sectional view taken along line AA.

FIG. 3 is an enlarged schematic view of the circle in FIG.

FIG. 4 is a vertical sectional view of the second embodiment.

FIG. 5 is a vertical sectional view of the third embodiment.

FIG. 6 is a connection form of a conventional film circuit board.

[Explanation of symbols]

1 Film circuit board 2 terminals 3 Anisotropic conductive connector 4 Conductive medium 5 Conductive part 6 electronic components 7 substrate 8 electrodes 9 Engagement protrusion 10 insertion holes 11 sockets 12 Conducting end face

Claims (4)

[Claims] 1. An elastic connector integrated with a film-like circuit board, characterized in that an anisotropic conductive connector is integrally formed with a terminal of the film-like circuit board. 2. The film-shaped circuit board integrated elastic connector according to claim 1, wherein the film-shaped circuit board and the anisotropic conductive connector are integrally molded in a mold. 3. The film-like circuit board according to claim 1, wherein the conductive portion of the anisotropic conductive connector is formed by orienting a conductive medium by magnetic force. Body type elastic connector 4. The film-shaped circuit board integrated elastic connector according to claim 3, wherein the conductive end surface of the conductive portion is formed in a convex shape.