WO2005089076A2

WO2005089076A2 - Film type conductive sheet, method for manufacturing the same, and conductive tape using the same

Info

Publication number: WO2005089076A2
Application number: PCT/KR2005/000791
Authority: WO
Inventors: Sung Suk Ju
Original assignee: Sung Suk Ju
Priority date: 2004-03-23
Filing date: 2005-03-18
Publication date: 2005-09-29
Also published as: KR20050094516A; WO2005089076A3

Abstract

A film type conductive sheet (10) made of synthetic resin having horizontal and vertical directional conductivities, capable of preventing burrs causing electric short-circuits, and having a narrow thickness while maintaining the horizontal and vertical directional conductivities is disclosed. The film type conductive sheet (10) includes a synthetic resin master film (11) having a plurality of penetrating holes (12), and metals (13, 13’) or metal pastes coated to the upper and lower sides of the synthetic resin master film (11) such that the metals (13, 13’) are connected to each other through the penetrating holes (12), enabling vertical conduction and horizontal conduction thereof. Since burrs are not generated when cutting and using the film type conductive sheet (10), and applying the same to equipment so that electronic equipment malfunction due to interference between circuits is prevented. Since a very thin film type conductive sheet (10) can be made, the film type conductive sheet (10) is applicable to wide range of applications.

Description

[DESCRIPTION] [Invention Title] FILM TYPE CONDUCTIVE SHEET, METHOD FOR MANUFACTURING THE SAME, AND CONDUCTIVE TAPE USING THE SAME

[Technical Field] The present invention relates to a film type conductive slieet, a method for manufacturing the film type conductive sheet, and a conductive tape using the film type conductive sheet, and more particularly, to a film type conductive sheet made of synthetic resin such that the film type conductive sheet exhibits horizontal conductivity and vertical conductivity, burrs causing electrical short circuits are prevented from being formed therein, and the film type conductrve sheet is formed to have a narrow thickness while maintaining horizontal conductivity and vertical conductivity.

[Background Art] As is well known, a variety of electronic equipment appeared during the course of industrialization. Such electronic equipment includes complex circuits such that high-end performance can be implemented in response to consumer demands for various functions, rapid responsiveness, and portability. In particular, portable electronic equipment, such as mobile communication terminals, is continuously being decreased in size. However, since several circuits must be integrated in a small space of the high end and small-sized electronic equipment, due to noise, titxat is, influence of electromagnetic waves, mechanical malfunctions may frequently occur and product quality may also be deteriorated. Moreover, it is well known that the electromagnetic waves emitted from electronic equipment have negative health effects. Therefore, the electromagnetic waves, detrimental to health, are shielded, absorbed, isolated, and grounded by a shielding device, an absorbing device, an insulator, a grounding device, or the like, provided in electronic devices. The shielding device and the grounding device require high horizontal conductivity and high vertical conductivity so as to transmit electromagnetic waves when considering its characteristics, and a conductor a conductive tape also require the horizontal conductivity and the vertical conductivity. Conductive sheets are widely used as shielding devices, grounding devices, and conductive tapes and exhibit the vertical conductivity. Depending upon the equipment to which they are applied, the conductive sheets may be required to be either very thin or very thick. Since some equipment must be buffered, the conductive sheet can be directly applied to equipment that is thin and requires buffering, while two conductive sheets and a buffering member exhibiting vertical conductivity and disposed between the conductive sheets are applied to equipment that is thick and requires buffering. The most general conductive sheets are woven fabric sheets, non-woven fabric sheets, neat sheets, or the like coated with metal, or metal pastes. Since such fabric conductive sheets can be made to have a thickness of about 0.1 mm, the demand for the same is on the rise. However, since the fabric conductive sheet cannot be made to have a thickness less than 0.1 mm no matter how thin the fabric sheet is made, application of the fabric conductive sheet to high-precision equipment having a narrow space is difficult and in which the fabric conductive sheet is closely contacted. Due to the characteristics of the fabric conductive sheet, burrs, wherein loose ends of yarn are exposed from the surfaces or sides of the conductive sheets, are generated when respective conductive devices are cut from a grey fabric, when a release paper is released from the release paper attached to one surface or both surfaces of the conductive sheets such that the conductive sheet is attached to the equipment, or by the contacts in use of the conductive sheets. Since such burrs cause leakage of electric current or short-circuiting, the burrs may cause the electronic equipment to malfunction. As such, the burrs make it difficult to employ the fabric conductive sheet in high-precision electronic equipment. Absolutely, although metal such as aluminum, nickel, copper, or the like has excellent vertical conductivity and horizontal conductivity and can be made to have a thickness of less than 0.1 mm, the shape thereof is easily deformed such that the thin metal sheet is winkled during use due to the characteristics of the metal thin sheet. Moreover, since the metal conductive device can be used only once, thin metal sheets are not used as the conductive sheet. Although the thin metal sheet is only partially used to be coated or attached to a surface of synthetic resin film, the metal-coated synthetic resin does not exhibit vertical conductivity. Therefore, the metal-coated synthetic sheet would not be mentioned as a conductive sheet. Another example is a film manufactured by directly mixing a synthetic resin polymer with metal components. Although such a film exhibits horizontal conductivity and vertical conductivity, the film has a high resistance. Thus, the film is used only as an antistatic agent.

[Disclosure] [ Technical Problem ] Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a film type conductive sheet made of a synthetic resin master film having a plurality of holes, and upper and lower surfaces coated with metal or metal pastes to exhibit vertical conductivity and horizontal conductivity, thereby preventing burrs causing equipment malfunction from being generated when cutting the synthetic resin master film into respective film type conductive sheets, and capable of being manufacture to a thickness of less than 0.1 mm while maintaining inherent properties such that the film type conductive sheet may be conveniently applied to a narrow space and a curved surface, a method for manufacturing the same, and a conductive tape using the same.

[Technical Solution] In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a film type conductive sheet including a synthetic resin master film having a plurality of penetrating holes, and metals or metal pastes coated to the upper and lower sides of the synthetic resin master film such that the metals are connected to each other through the penetrating holes, resulting in enabling vertical conduction and horizontal conduction thereof. The objects of the present invention can be also accomplished by the provision of a method for manufacturing a film type conductive sheet including the steps of puncturing a plurality of minute penetrating holes in a synthetic resin master film, and coating the upper and lower sides of the punctured synthetic resin master film with metals such that the metals are connected to each other through the minute penetrating holes. The objects of the present invention can be also accomplished by the provision of a method for manufacturing a film type conductive sheet including the steps of coating metal to a side of a synthetic resin master film, puncturing a plurality of minute penetrating holes in the synthetic resin master film coated with the metal or metal pastes, and coating the metal or metal pastes to the side opposite the metal- or metal paste-coated side of the punctured synthetic resin master film such that the metals are connected to each other through the minute penetrating holes. The objects of the present invention can be also accomplished by the provision of a conductive tape using a film type conductive sheet manufactured by coating adhesive to one or both sides of the film type conductive sheet manufactured by the above methods and attaching a release paper on the adhesive.

[Advantageous Effects] As described above, according to the present invention, the film type conductive sheet, rather than being made of fabric, is made of synthetic resin film. The synthetic film is punctured to have a plurality of holes and the upper and lower sides thereof are coated with metal or metal pastes such that the coated metal or metal pates electrically connect the upper and lower sides through the holes. Thus, due to the characteristics of the synthetic resin film, the film type conductive sheet does not generate burrs when cutting and using the film type conductive sheet, and applying the same to equipment so that electronic equipment malfunction due to interference between circuits is prevented. Since it is possible to manufacture a very thin film type conductive sheet, the film type conductive sheet can be widely applied to a variety of equipment having narrow spaces and curved portions. Moreover, since the metals or metal pastes coated to the upper and lower sides of the film type conductive sheet are connected to each other through the holes, the film type conductive sheet exhibits perfect vertical and horizontal conductivity and satisfies the requirements as a conductive device. [Description of Drawings ] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: Fig. 1 is a perspective view illustrating a film type conductive sheet according to the preferred embodiment of the present invention; Fig. 2 is a sectional view illustrating the film type conductive sheet according to the preferred embodiment of the present invention; Fig. 3 is a view illustrating a process of manufacturing the film type conductive sheet according to the preferred embodiment of the present invention; Fig. 4 is a view illustrating a process of manufacturing the film type conductive sheet according to another preferred embodiment of the present invention; Fig. 5 is a sectional view illustrating penetrating holes of the film type conductive sheet according to another preferred embodiment of the present invention; and Fig. 6 is a view illustrating a conductive tape using the film type conductive sheet according to the preferred embodiment of the present invention.

[Best Mode] Hereinafter, a film type conductive sheet, a method for manufacturing the same, and a conductive tape using the same according to the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The film type conductive sheet according to the preferred embodiment of the present invention, as shown in Figs. 1 and 2, includes a synthetic resin master film 11 having a plurality of penetrating holes 12, and metals 13 and 13' or metal pates coated to the upper and lower sides of the synthetic resin master film 11 such that the metals 13 and 13' are connected to each other through the penetrating holes 12, providing vertical conductivity and horizontal conductivity thereto. The film type conductive sheet is manufactured, as shown in Fig. 3, such that the synthetic resin master film 11 is punctured to have a plurality of minute penetrating holes 12, and the upper and lower sides of the punctured synthetic resin master film 11 are coated with the metals 13 and 13' or the metal pastes to connect the metals 13 and 13' to each other through the minute penetrating holes 12. Moreover, as shown in Fig. 4, the film type conductive sheet may also be manufactured by coating the metal 13 to a side of the synthetic resin master film 11, by puncturing a plurality of minute penetrating holes 12 in the synthetic resin master film 11 coated with the metal 13, and by coating the metal 13' to the opposite side of the metal- or the metal paste-coated side of the punctured synthetic resin master film 11 to connect the metals 13 and 13' to each other through the minute penetrating holes 12. Any synthetic resin capable of being manufactured in the form of films, such as polyimide, polyethylene, polyvinyl chloride, or the like, can be used as the synthetic resin master film 11 for manufacturing the conductive sheet. The metals 13 and 13' or the metal pastes coated to the synthetic resin master film 11 may be any conductive metal such as aluminum (Al), nickel (Ni), copper (Cu), silver (Ag), gold (Au), or the like, and single or multiple metals 13 and 13' can be coated to the synthetic resin master film 11. Moreover, the punctuation of the synthetic resin master film 11 is performed in any way capable of punctuating the penetrating holes 12 in the synthetic resin master film 11, such as a mold, laser, ultrasonic waves, high frequency waves, or the like. The metals 13 and 13' or the metal pastes can be coated upon the synthetic resin master film 11 via any method capable of coating the metals 13 and 13' upon the synthetic resin master film 11, such as spraying, direct coating, plating, vapor deposition, or the like. Operation of the film type conductive sheet according to the preferred embodiment of the present invention will be described in detail as follows. The conductive sheet 10, like the shielding device and the grounding tape, is manufactured in the form of sheets to have excellent vertical and horizontal conductivity. If burrs are generated on the surface of the conductive sheet 10, the burrs may interfere with the internal circuits of electronic devices and causes circuit-shorts, causing the electronic devices to malfunction. More particularly, the burrs generated from the conductive sheet 10 are fatal to small sized electronic devices such as mobile communication terminals. In addition, in order to apply the conductive sheet 10 to the inside of the electronic device, the conductive sheet 10 must be thin and maintain its shape when the conductive sheet 10 is applied to a narrow space or curved portions. The present invention is designed to prevent burrs from being generated and selects the synthetic resin film as raw material to provide the conductive sheet

10 being thin and maintaining its shape. The present invention also provides vertical conductivity to manufacture the synthetic resin film in the conductive sheet 10. In other words, since the synthetic resin film does not permit permeation by any material, the synthetic resin master film 11 is punctured with a plurality of minute penetrating holes 12 and the upper and lower sides thereof are coated with the metals 13 and 13' or the metal pastes. The metals 13 and 13' or the metal pastes permeate and fill the minute penetrating holes 12 during the coating of the upper and lower sides of the punctured synthetic resin master film 11. The metals 13 and 13' or the metal pastes are connected to each other such that the coated synthetic resin master film 11 exhibits perfect vertical and horizontal conductivity. Thus, according to the film type conductive sheet 10 manufactured by the above methods, burrs are not generated when cutting the film type conductive sheet 10 into respective conductive devices, using the same, or operating the electronic devices employing the film type conductive sheet 10. Since the synthetic resin film as raw material of the conductive sheet 10 can be manufactured to have a thickness of less than 0.02 mm, the applications of the film type conductive sheet 10 can be expanded. Although the penetrating holes 12 of the synthetic resin master film 11 are preferably formed to have a diameter less than 0.01 mm and filled with the metals 13 and 13', it should be obvious to one skilled in the art that the size of the penetrating holes 12 can be modified according to the conductivity and thickness of the synthetic resin master film 11. Thus, when forming large penetrating holes 12, as shown in Fig. 5, the penetrating holes 12 are perfectly filled with the metals 13 and 13'. However, since the metals 13 and 13' at the upper and lower sides of the synthetic resin master film 11 are connected to each other through the penetrating holes 12, the film type conductive sheet 10 can maintain vertical conductivity. Moreover, the film type conductive sheet 10 according to the preferred embodiment of the present invention, as shown in Fig. 6, may be manufactured in the form of a conductive tape by coating adhesive 14 to one or both sides of the film type conductive sheet 10 and attaching a release paper 15 on the adhesive 14. In addition, the thin film type conductive sheet 10 can be applied to any places requiring the conductive sheet 10 having horizontal and vertical conductivity and preventing burrs from being generating. Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, it is understood that technical scope of the present invention is not limited to the above description and those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

[CLAIMS]

[Claim 1 ] A film type conductive sheet comprising: a synthetic resin master film having a plurality of penetrating holes; and metals or metal pastes coated to the upper and lower sides of the synthetic resin master film such that the metals or the metal pastes are connected to each other through the penetrating holes, resulting in enabling vertical conduction and horizontal conduction thereof.

[Claim 2] A method for manufacturing a fil type conductive sheet comprising the steps of: puncturing a plurality of minute penetrating holes in a synthetic resin master film; and coating the upper and lower sides of the punctured synthetic resin master film with metals such that the metals are connected to each other through the minute penetrating holes.

[Claim 3] A method for manufacturing a film type conductive sheet comprising the steps of: coating metal to a side of a synthetic resin master film; puncturing a plurality of minute penetrating holes in the synthetic resin master film coated with the metal or the metal pastes; and coating the metal or the metal pastes to the side opposite the metal- or the metal paste-coated side of the punctured synthetic resin master film such that the metals or the metal pastes are connected to each other through the minute penetrating holes.

[Claim 4] A conductive tape using a film type conductive sheet manufactured by coating adhesive to one or both sides of the film type conductive sheet manufactured by the methods as set forth in claims 2 or 3 and attaching a release paper on the adhesive.