JPH0848955A - Roll of adhesive film and method for using the same - Google Patents

Abstract

PURPOSE:To prepare a roll of an adhesive film which prevents electronic parts from electrostatic breakdown, enables the connection of fine circuits, and is suitable for automation by improving a laminate obtd. by peelably forming a adhesive layer on a conductive substrate. CONSTITUTION:This roll of an adhesive film is obtd. by winding an adhesive film 5 obtd. by peelably forming an adhesive layer 2 on a conductive substrate 1 around a conductive core 3 connected electrically to the substrate 1. The roll is used by grounding the core 3 connected electrically to the substrate 1. Examples of the substrate 1 are a conductive plastic film prepd. by mixing a plastic with a conductive filler or an org. conductor, a sheet comprising a conductive plastic, a metal foil or net, etc., laminated to an insulator, and a metal foil or net, etc., alone. The core 3 is made e.g. from the same material as the substrate 1 or from a metal. The adhesive layer is formed peelably by using a low-polarity film or by dealing with the matter in terms of shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive film winding body suitable for forming a circuit or electrodes between two circuit boards in a liquid crystal panel or the like and connecting both circuits, and a method of using the same. Regarding

[0002]

2. Description of the Related Art In the case of connecting electronic parts between two circuit boards or on these circuits, an adhesive for bonding electronic parts is used to bond them and to electrically connect them. Are known as thermoplastic materials such as styrene and polyester, and thermosetting materials such as epoxy and silicone. In this case, conductive particles are mixed in the adhesive to obtain an electrical connection in the thickness direction of the adhesive by pressurization (for example, JP-A-55-104007) and conductive particles are not used. , Which obtains electrical connection by fine irregularities on the electrode surface due to pressurization at the time of connection (for example, JP-A-60-26
2430).

These adhesives are releasable substrates (hereinafter referred to as separators) made of polyester film or paper surface-treated with a release agent such as silicone, or low-polarity film such as polyethylene, polypropylene, or tetrafluoroethylene.
It is often supplied as a film by forming an adhesive layer on the top. Since it is a film type, application work is not required, and since it is possible to manufacture with continuous products of constant thickness and width, it is possible to automate the adhesive formation on the circuit and obtain high reliability of the connection part. Cheap. In these connections, the adhesive film is temporarily connected to one circuit by pressure or the like, then the separator is peeled off, and the adhesive film is aligned with the other circuit to be permanently connected. At this time, in many cases, static electricity is generated in the temporary connection and the separator peeling process, and electronic components such as a semiconductor chip and a thin film transistor around the connection circuit are destroyed. As a countermeasure against this, humidification of the work atmosphere, a blower for removing static electricity, etc. are performed, but they were not sufficient. If these electronic components are destroyed, they will not operate normally, so it is necessary to replace them with non-defective products, resulting in a great deal of labor and resource loss.

The inventors of the present invention have previously made a trial of an adhesive film suitable for generating electronic parts from electrostatic breakdown by making the releasable base material conductive, according to Japanese Patent Application No. 4-57510. Proposed. This attempt is suitable for preventing the generation of static electricity, but there is a problem in how to ground. That is, it is necessary to bring grounded contacts such as metal rolls and pins into contact when the conductive and peelable base material is running, and these contacts are also provided in the vicinity of the connection part in terms of grounding efficiency. As a result, debris from the peelable base material generated by contact mixes with the adhesive during the connection process, and defects such as leaks and shorts between adjacent circuits are likely to occur, making it difficult to respond to the ever-increasing miniaturization of circuits. That is. The purpose of the present invention is to
An object of the present invention is to provide an adhesive film roll which is suitable for preventing electronic devices from being destroyed by static electricity, capable of connecting fine circuits, and adapting to automation, and a method of using the same.

[0005]

According to the present invention, a laminate having a peelable adhesive film formed on a conductive base material is wound around a conductive core electrically connected to the base material. The present invention relates to a method for using an adhesive film roll as described above and an adhesive film roll for grounding a conductive core body connected to a conductive base material. FIG. 1 is a schematic perspective view showing the structure of an adhesive film roll of the present invention. In FIG. 1, reference numeral 1 denotes a conductive base material, and an adhesive layer 2 is releasably adhered to the conductive base material 1 to form a laminate (adhesive film) 5.
Is wound around the conductive core body 3.

As an example of the conductive base material, a conductive plastic film obtained by mixing a plastic such as polypropylene, polyvinyl chloride or polyethylene with a conductive filler such as carbon powder or metal particles or an organic conductive material such as polypyrrole or polyaniline is used. In addition to these, typical ones include those obtained by laminating these conductive plastics, metal foils, nets and the like on an insulator, and those formed individually in layers. To make the adhesive layer 2 peelable from the conductive substrate 1, a low-polarity film such as polyethylene or tetrafluoroethylene may be used as the material of the conductive plastic film,
Alternatively, the surface of the conductive base material 1 may be roughened or wavy streaks may be provided to deal with the shape. The surface of the conductive base material 1 may be surface-treated with a release agent such as silicone. When the release agent is formed on both surfaces of the conductive base material 1, it is preferable that the release agent is easily rewound in the case of a tape-shaped roll. Furthermore, a composite of a plastic film and a metal foil, a net-like material, or the like is also preferable because it is easy to obtain a balance between conductivity and mechanical strength.

As the adhesive layer 2, basically, all general adhesives can be applied, but so-called adhesives for electronic parts whose impurity ions and curing speed are strictly controlled are preferable. These may be either thermoplastic or thermosetting, or may be a composite or mixture of these. Alternatively, conductive particles may be blended in the adhesive to obtain an electrical connection in the thickness direction of the adhesive by applying pressure, etc. It may be one that obtains an electrical connection by contacting fine irregularities. A mixture of conductive particles is preferable because it is less affected by the electrode surface and the circuit surface and can be applied to a wide range of adherends.

It is sufficient that at least a part of the surface of the conductive core 3 is conductive, and a conductive path cannot be formed from the peelable conductive base material 1 through at least a part of the conductive core 3. Good. That is, as an example in which the entire conductive core body 3 is conductive, conductive plastic mixed with a conductive filler similar to the conductive base material 1 and metals such as aluminum, stainless steel, and iron can be exemplified. These can be obtained in a predetermined shape by melt molding or the like. As an example in which a part of the conductive core 3 is conductive, a surface conductive treated product in which a metal layer is formed on the entire surface or a part of the surface of an insulator such as plastic or paper by plating, vapor deposition, sticking of foil, etc. In this case, there is an advantage that the conductive core 3 can be easily obtained by devising a general-purpose insulating core. It is preferable that the conductive core body 3 has a space portion 4 formed in a central portion thereof so that a fixing shaft can be passed therethrough.

In the present invention, as shown in FIGS. 2 to 4, the electrically conductive peelable substrate 1 and the conductive core 3 are electrically connected. That is, FIG. 2 shows the case where the conductive substrate 1 is inside and the adhesive layer 2 is outside, and FIG. 3 is the case where the adhesive layer 2 is inside and the conductive substrate 1 is outside. In FIG. 3, the adhesive layer 2 at the tip of the adhesive film is removed and the conductive base material 1 is replaced with the conductive core body 3.
Is in contact with. FIG. 4 shows an example in which the conductive base material 1 is brought into contact with the conductive core body 3 through the conductive particles in the adhesive and electrically connected. For the purpose, the conductive base material 1 and the conductive core body 3 are preferably as low in resistance as possible, and have a surface resistance of 10 ⁵ Ω / cm square or less, more preferably 10 ² Ω / cm square. It is the following. As a method of using the adhesive film roll of the present invention, for example, as shown in FIG. 5, the conductive core body 3 and the shaft 7 are electrically connected with each other by a bolt or the like, and the shaft 7 is attached to the shaft 7 using a support body or the like. By taking the ground 8, the effect of preventing electrostatic breakdown can be obtained. At this time, conductive or insulating guides 10 may be provided at both ends of the adhesive film roll 9 as needed. The guide 10 may be provided on one of the ends of the winding body 9.

Further, as shown in FIG. 6, the adhesive film winding body 9
When connecting the electronic components while winding the same on another conductive core 3 ′, the ground 8 may be taken on both of the two conductive cores 3 and 3 ′ connected to the conductive base material 1, One of the conductive cores may be grounded. That is, after the adhesive layer 2 is transferred from the wound body 9 to the electronic component 13 by the press 14 or the like, only the conductive base material 1 is connected to another conductive core body 3'and wound up, and the conductive material is made conductive by the method described above. The core 8 can be grounded by the cores 3 and 3 '. In this case, the electrostatic breakdown prevention becomes more effective by doubling the ground point, which is preferable. The above grounding method has been described in the case of peeling the adhesive layer 2 from the peelable conductive base material 1 at the time of use, but in the case of using the base material without peeling the adhesive layer 2 such as an adhesive tape. Is also applicable.

[0011]

EXAMPLES Examples of the present invention will be described below. Example 1 As a releasable substrate, a 40 μm-thick polyester film was used to form a thin film of aluminum (Al) metal by a vapor deposition method.
Both sides of the conductive base material composed of squares were treated with silicone as a release agent. An epoxy adhesive was applied on the surface of the Al side by a roll coater to form an adhesive layer having a thickness of 20 μm after drying. As shown in FIG. 3, this adhesive film has an adhesive layer 2 inside and a conductive core made of Al (inner diameter 18.5 m
m, the outer diameter was 42 mm) 3 and the tape-shaped wound body had a width of 2 mm, the unwinding of the wound body was easy.
During winding, the adhesive layer and the release agent on the Al surface at the end of the adhesive film were removed, and the Al surface of the conductive substrate 1 and the conductive core 3 were brought into contact with each other and electrically connected.

The above-mentioned adhesive film is applied to the connection terminals of a flexible wiring board (TAB, wiring density: 12 wires / mm) on which an IC chip is mounted by the conductivity of a base material capable of removing static electricity. A temporary connection was made by pressing while guiding to the conductive core body 3 and grounding from the iron shaft 7 closely attached to the conductive core body 3. After that, the separator (base material) was removed, and the main connection was made to the glass terminal of the liquid crystal display. In this experiment, destruction of the IC chip due to static electricity was not observed, and fragments of the conductive base material were not mixed in, and fine circuits could be connected. It is considered that the static electricity was grounded via the conductive base material 1, the conductive core body 3, and the iron shaft 7.

Example 2 In place of the epoxy adhesive used in Example 1, 1% by volume of conductive particles having a particle size of 5 μm and having a thin layer of nickel / gold on the surface of polystyrene spheres were mixed with the same epoxy adhesive. An adhesive film was obtained in the same manner as in Example 1 except that the adhesive layer 2 was used as shown in FIG.
When the tape-shaped wound body having a width of 2 mm was wound around the same conductive core body as in Example 1 with the inside being the inside, the unwinding of the wound body was easy. When connection was made in the same manner as in Example 1 using this, it was possible to connect fine circuits without destruction of the IC chip due to static electricity. In this example, the electrically conductive particles in the adhesive facilitated the electrical connection between the Al surface of the composite film and the electrically conductive core.

Comparative Example An adhesive film wound body was obtained in the same manner as in Example 1 except that the core of the cardboard which was conventionally used was used in place of the conductive core of Example 1. When the same connection as in Example 1 was made, a large number of IC chips were broken by static electricity because no ground was taken. In addition, a mixture of fragments of the cardboard core was partially observed at the connection part.

Example 3 A core was made of an insulative ABS resin, except that a copper foil having a thickness of 18 μm was adhered with a double-sided tape so as to reach the inner iron shaft from the surface of the core to form a conductive core. Example 2
An adhesive film roll was obtained in the same manner as. Separately, one of the conductive cores was manufactured, and the conductive cores on both the unwinding side 11 and the winding side 12 were grounded by the method shown in FIG. 6 to connect the electronic components of Example 1. Also in this case, the IC chip was not destroyed by static electricity, and fine circuits could be connected. Static electricity is the base material, copper foil formed on the conductive core,
It is thought that it was grounded via the iron shaft. In this embodiment, a conductive core body could be obtained by devising a general-purpose insulating core body.

Example 4 The same components as in Example 3 were grounded from a conductive core body only for winding, and electronic parts were connected. Also in this case, the IC chip was not destroyed by static electricity, and fine circuits could be connected.

[0017]

According to the present invention, since the releasable base material has conductivity, static electricity generated in the connecting step of electronic parts is utilized by utilizing the conductivity of the base material. It can be grounded via a conductive core. Further, for example, a shaft or the like for setting the adhesive film winding body can be installed far from the connecting portion. Due to these, it is difficult for the fragments of the base material to be mixed into the adhesive film in the connecting step. Therefore, it is possible to cope with the miniaturization of the circuit together with the effect of preventing electrostatic breakdown. It is also possible to install the ground points at the unwinding part and the winding part from the adhesive film roll.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing the configuration of an adhesive film roll of the present invention.

FIG. 2 is a cross-sectional view showing a method of winding an adhesive film.

FIG. 3 is a cross-sectional view showing a method of winding an adhesive film.

FIG. 4 is a cross-sectional view showing a method of winding an adhesive film.

FIG. 5 is a cross-sectional view illustrating a method of using the adhesive film roll.

FIG. 6 is a cross-sectional view illustrating a method of using the adhesive film roll.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Conductive substrate, 2 ... Adhesive layer, 3 ... Conductive core, 4 ... Space part, 5 ... Laminated body, 6 ... Conductive particle, 7 ... Shaft, 8
… Earth, 9… Adhesive film roll, 10… Guide, 1
1 ... Unwinding side, 12 ... Winding side, 13 ... Electronic component,
14 ... Press

Continuation of front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location C09J 7/00 JHK (72) Inventor Hiroshi Matsuoka 1150 Gozamiya, Shimodate-shi, Ibaraki Hitachi Chemical Co., Ltd. Yuki in the factory

Claims (3)

[Claims] 1. An adhesive film roll formed by winding an adhesive film having an adhesive layer formed on a conductive base material in a peelable manner, onto a conductive core body electrically connected to the base material. 2. The adhesive layer contains conductive particles.
The adhesive film roll as described. 3. The method of using the adhesive film roll according to claim 1, wherein the conductive core electrically connected to the conductive base material is grounded.