WO2011111324A1 - 電磁波シールドフィルム、これを用いたフレキシブル基板及びその製造方法 - Google Patents
電磁波シールドフィルム、これを用いたフレキシブル基板及びその製造方法 Download PDFInfo
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- WO2011111324A1 WO2011111324A1 PCT/JP2011/001102 JP2011001102W WO2011111324A1 WO 2011111324 A1 WO2011111324 A1 WO 2011111324A1 JP 2011001102 W JP2011001102 W JP 2011001102W WO 2011111324 A1 WO2011111324 A1 WO 2011111324A1
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- electromagnetic wave
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/002—Inhomogeneous material in general
- H01B3/004—Inhomogeneous material in general with conductive additives or conductive layers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0009—Casings with provisions to reduce EMI leakage through the joining parts
Definitions
- the present invention relates to an electromagnetic wave shielding film, a flexible substrate using the same, and a method for producing the same, and more specifically, an electromagnetic wave shielding film capable of maintaining an electromagnetic wave shielding effect even after long-term sliding, and an electromagnetic wave shield using this film
- the present invention relates to a flexible substrate having a layer formed thereon and a method for manufacturing the same.
- electromagnetic wave shielding is carried out by laminating an electromagnetic wave shielding film on a flexible substrate (FPC) disposed in a hinge portion of a mobile phone.
- FPC flexible substrate
- the electromagnetic wave shielding film a film having at least a conductive layer and a protective layer, and the conductive layer formed from a conductive adhesive (conductive paste) in which metal powder is dispersed in a binder resin is used.
- Such an electromagnetic wave shielding film is required to be thinner than ever in connection with the thinning of a mobile phone or the like, but if other conditions are the same, the shielding performance decreases as the thickness is reduced. It is a problem to suppress the decrease.
- flexible substrates that are subject to electromagnetic wave shielding are used in parts that are frequently bent and slid when used in mobile phones and the like, and the problem that the electromagnetic wave shielding effect decreases as the period of use increases. Therefore, the solution is also desired.
- Patent Document 1 discloses silver particles having an average particle size of 0.5 ⁇ m to 20 ⁇ m and granular silver particles having an average particle size of primary particles of 50 nm or less in order to improve conductivity, adhesion, and electromagnetic wave shielding properties. Is used at a certain rate.
- Patent Document 2 discloses that a scaly silver powder having an average particle size of 2.0 to 5.0 ⁇ m and an average particle size of 10 to 19 ⁇ m are used in order to obtain a conductive paste composition that can satisfy the bending characteristics required by a flexible substrate. The use of mixed powders with dendritic silver-plated copper powder is disclosed.
- an object of the present invention is to provide an electromagnetic wave shielding film in which the initial electromagnetic wave shielding property is maintained for a long period of time. Moreover, it aims at providing the flexible substrate by which the electromagnetic wave shielding layer was formed using this film, and its manufacturing method.
- the electromagnetic wave shielding film of the present invention is an electromagnetic wave shielding film in which a protective layer is laminated on a conductive layer made of (A) metal powder and (B) a binder resin, in order to solve the above-described problems,
- the conductive layer is, as the metal powder, (a) flaky metal powder having an average thickness of 50 to 300 nm and an average particle diameter of 3 to 10 ⁇ m, and (b) acicular or dendritic metal powder having an average particle diameter of 3 to 10 ⁇ m. It is assumed that it is formed from a conductive paste containing
- the method for producing a flexible substrate of the present invention comprises placing the electromagnetic wave shielding film of the present invention on a flexible substrate, and then heating the flexible substrate together with the electromagnetic wave shielding film while pressing in the thickness direction. In this method, an electromagnetic wave shielding layer is formed.
- the flexible substrate of the present invention has an electromagnetic wave shielding layer made of the electromagnetic wave shielding film of the present invention.
- the electromagnetic wave shielding film of the present invention has an excellent electromagnetic wave shielding effect.
- an electromagnetic wave shielding layer is provided on a flexible substrate using this film, the electromagnetic wave shielding is high even after several hundred thousand times of bending or sliding. The effect of being maintained is obtained.
- a flexible substrate provided with the electromagnetic wave shielding layer in which the excellent electromagnetic wave shielding effect described above lasts for a long time can be easily obtained.
- the electromagnetic wave shielding film of the present invention has at least a conductive layer made of metal powder and a binder resin and a protective layer.
- metal powder flaky metal powder and needle-like or dendritic metal powder are used. It is characterized by using together.
- the “flaky metal powder” referred to in the present invention is usually referred to as a scaly shape or a flake shape, and may be a flat shape, and its planar shape is not particularly limited.
- a scaly metal powder formed by crushing or crushing particles of various shapes is advantageous because it is advantageous in terms of cost and productivity.
- the type of metal in the flaky metal powder is gold, silver, silver-coated copper, copper, nickel, etc. Among them, silver and silver-coated copper are preferable.
- the flaky metal powder preferably has an average thickness of 50 to 300 nm and an average particle size of 3 to 10 ⁇ m. When the average thickness is larger than 300 nm, the melting point of the flaky metal powder is hardly lowered, and when the average thickness is smaller than 50 nm, the production cost is significantly increased. Further, when the average particle size is larger than 10 ⁇ m, the dispersibility is lowered, and when the average particle size is smaller than 3 ⁇ m, the conductivity when the metal powder is low-filled tends to be lowered.
- the “needle-like or dendritic metal powder” may be needle-like, dendritic (dendritic), or a mixture thereof.
- the dendritic shape is not limited to those having a portion that is clearly recognized as a branched shape, and includes those having protrusions such as confetti and those having convex portions of various sizes.
- the kind of metal of this acicular or dendritic metal powder is also gold, silver, silver-coated copper, copper, nickel, etc., as described above, and silver-coated copper is particularly preferable.
- the size is preferably in the range of 3 to 10 ⁇ m in average particle size. If the average particle size is larger than 10 ⁇ m, it is difficult to reduce the thickness of the shield film.
- the average particle diameter and average thickness of the metal powder can be measured by a laser diffraction scattering method.
- the metal powders are bonded to each other through a heating process under pressure, which will be described later, or a strong bond equivalent thereto, and further, the bonding is performed through a solder reflow process described later. It will be stronger.
- a: b 20: 80 to 80:20.
- thermosetting resin such as an epoxy resin, a urethane resin, an acrylic resin, a polyimide resin, a phenol resin, or a melamine resin
- urethane resin is preferably used because of its excellent flexibility.
- the method for producing an electromagnetic wave shielding film from the metal powder and the binder resin is not particularly limited.
- a paste made of the metal powder and the binder resin is prepared and coated on a release paper to form a film serving as a conductive layer.
- the thickness of this film is preferably 8 to 28 ⁇ m, and preferably 5 to 25 ⁇ m after the pressing step described later. If the thickness after the pressing step is less than 5 ⁇ m, it is difficult to obtain sufficient electromagnetic wave shielding properties, and if it exceeds 25 ⁇ m, it is not preferable because of a demand for thinning.
- a known additive can be added to the conductive layer as necessary without departing from the object of the present invention.
- additives include flame retardants, leveling agents, viscosity modifiers and the like.
- the flame retardant an inorganic or organic flame retardant such as phosphorus can be used as appropriate.
- the electromagnetic wave shielding film of the present invention can be obtained by laminating the film constituting the protective layer on the film constituting the conductive layer. Or the film which comprises a protective layer previously can be formed, and the film which comprises a conductive layer can also be laminated
- the film constituting the protective layer can be formed of an epoxy resin, a urethane resin or the like.
- the surface hardness of the protective layer is preferably H to 4H in terms of pencil hardness.
- an acrylic hard coat layer can be laminated on the layer made of the epoxy resin or urethane resin as necessary. If the surface hardness of the protective layer is less than H as the pencil hardness, the protective layer is likely to be damaged, whereas if it is greater than 4H, the flexibility is reduced and the sliding characteristics may be deteriorated.
- the thickness of the film constituting the protective layer is preferably 3 to 15 ⁇ m, and preferably 2 to 12 ⁇ m after the pressing step described later.
- the thickness after the pressing step is less than 2 ⁇ m, the strength as the protective layer is insufficient, and when the thickness exceeds 12 ⁇ m, it is not preferable because of the demand for thinning.
- the entire electromagnetic wave shielding film preferably has a thickness of 11 to 30 ⁇ m before the pressing step described later, and preferably 7 to 28 ⁇ m after the pressing step.
- the electromagnetic wave shielding film of the present invention is placed on the flexible substrate and subjected to a pressing step of heating while pressing at a pressure of 1 to 5 MPa.
- a shield layer can be formed.
- the heating temperature in the pressing step is preferably 140 to 200 ° C.
- the sliding characteristics can be further improved dramatically.
- the conditions for performing solder reflow are not particularly limited as long as the conditions allow the solder to melt, but are usually about 260 ° C. for about 4 seconds. Since the melting point of the metal is lowered by thinning, the flaky metal powder used in the present invention is melted by the reflow process in this temperature range even with a high melting point metal such as silver having a melting point of 962 ° C. A metal bond or a strong bond equivalent thereto is generated.
- the electromagnetic wave shielding film of this invention has the adhesive force of 2N or more with a 180 degree peel strength with respect to a polyimide.
- Examples and Comparative Examples A two-layer structure consisting of an epoxy soft layer and an acrylic hard coat layer by coating an epoxy resin with a thickness of 6 ⁇ m on the release film and drying, and then applying and drying an acrylic hard coat solution on the release film.
- a protective layer (reference numeral 1 in FIGS. 1 and 2 described later) was formed.
- a conductive paste prepared with the formulation shown in Tables 1 and 2 was coated and dried to form a conductive layer (reference numeral 2 in FIGS. 1 and 2), thereby obtaining an electromagnetic wave shielding film.
- the following evaluation was performed using the obtained electromagnetic wave shielding film.
- the details of the binder resin and metal powder used are as follows.
- Binder resin manufactured by Dainichi Seika Kogyo Co., Ltd., urethane resin UD1357
- Metal powder (a) scale-like silver powder: average thickness 100 nm, average particle diameter 5 ⁇ m, melting point about 250 ° C. (B) Dendritic silver-coated copper powder: average particle size 5 ⁇ m
- the conductive layer side of the electromagnetic wave shielding film is attached to a test plate via a polyimide film (manufactured by Toray DuPont Co., Ltd., Kapton 100H (trade name)), and the adhesive is also applied to the protective layer side.
- connection resistance The electromagnetic wave shielding film is placed on a flexible printed circuit board (thickness 53.5 ⁇ m) and heated at 170 ° C. for 30 minutes while being pressurized at a pressure of 3 MPa, as shown in FIGS. 2 (a) and 2 (b).
- a sample for evaluation of a flexible printed circuit board (FPC) provided with an electromagnetic wave shielding film layer having a cross-sectional shape was prepared, and then solder reflow was performed 5 times.
- reference numeral 1 denotes a protective layer of the electromagnetic wave shielding film
- reference numeral 2 denotes the conductive layer.
- Reference numeral 3 is an FPC polyimide layer (thickness 12.5 ⁇ m)
- reference numeral 4 is a copper layer (Cu: 18 ⁇ m)
- reference numeral 5 is an electroless nickel-gold plating layer (Ni: 3 to 5 ⁇ m, Au: 0.05 to 0.1 ⁇ m)
- reference numeral 6 denotes an adhesive layer (thickness of 35 ⁇ m)
- reference numeral 7 denotes a polyimide layer (thickness of 25 ⁇ m).
- a is the diameter of the ground portion.
- (B) is an enlarged view of the ground part in (a).
- the electromagnetic wave shielding film of the present invention is suitably used for all flexible substrates incorporated in devices such as digital cameras having bent portions and sliding portions in addition to mobile phones.
- SYMBOLS 1 Protective layer of electromagnetic shielding film, 2 ... Conductive layer, 3, 7 ... Polyimide layer, 4 ... Copper layer, 5 ... Nickel-gold plating layer, 6 ... Adhesive layer, DESCRIPTION OF SYMBOLS 11 ... Fixed plate, 12 ... Sliding plate, 13 ... FPC, 14, 15 ... Electromagnetic wave shielding film
Abstract
Description
離型フィルム上にエポキシ系樹脂を厚さ6μmでコーティングして乾燥し、これにアクリル系ハードコート液を塗布して乾燥することにより、エポキシ系ソフト層とアクリル系ハードコート層との2層構造からなる保護層(後述する図1,2における符号1)を形成した。この保護層の上に表1,2に示す配合で調製した導電性ペーストをコーティングし、乾燥することにより導電層(同図1,2における符号2)を形成し、電磁波シールドフィルムを得た。得られた電磁波シールドフィルムを用いて以下の評価を行った。使用したバインダー樹脂及び金属粉の詳細は、次の通りである。
金属粉:(a)鱗片状銀粉:平均厚さ100nm、平均粒径5μm、融点約250℃
(b)樹枝状銀コート銅粉:平均粒径5μm
図1に示す立方体形状の電極A,B(電極面積:1cm2(L1=L2=L3=1cm)、電極間隔d:1cm、電極表面:金メッキ処理)を導電層2に載置し、各電極に矢印で示す方向に4.9Nの荷重を加え、A-B電極間の抵抗値を4端子法で測定し、測定開始から1分後の値をもってシート抵抗とした。測定雰囲気温度は常温(18~28℃)とし、測定には249mm×50mmのカットサンプルを用いた。試験数をn=5とした平均値を表1に示す。
上記電磁波シールドフィルムの導電層側をポリイミドフィルム(東レ・デュポン(株)製、カプトン100H(商品名))を介して試験板に貼付し、保護層側にも接着剤層を介してポリイミドフィルム(同カプトン100H)を貼付し、50mm/分でポリイミドフィルムから引き剥がした。試験数をn=5とした平均値を表1に示す。
上記電磁波シールドフィルムをフレキシブルプリント基板(厚さ53.5μm)に載せ、圧力3MPaで加圧しながら、170℃で30分間加熱して、図2(a)及び(b)に示す断面形状を有する電磁波シールドフィルム層を備えたフレキシブルプリント基板(FPC)の評価用試料を作成し、その後はんだリフローを5回行った。図2(a)及び(b)において、符号1は電磁波シールドフィルムの保護層、符号2はその導電層を示す。また、符号3はFPCのポリイミド層(厚さ12.5μm)、符号4は銅層(Cu:18μm)、符号5は無電解ニッケル-金メッキ層(Ni:3~5μm、Au:0.05~0.1μm)、符号6は接着剤層(厚さ35μm)、符号7はポリイミド層(厚さ25μm)を示す。aはグランド部径である。(b)は(a)におけるグラウンド部の拡大図である。グランド部径(a)が0.5mmφ、0.8mmφ、1.0mmφのそれぞれの場合における抵抗値R(接続抵抗)を測定した。試験数をn=5とした平均値を表1,2に示す。
ポリイミド層(12.5μm)、接着剤層(15μm)、銅箔層(12μm)、及びポリイミド層(12.5μm)が上からこの順に積層されてなる4層構造のFPC13の上下両面に電磁波シールドフィルム14,15(長さ100mm、幅12mm)を積層し、評価用試料を作成した。この評価用試料を、FPC13の上面側が内側になるように長さ方向に屈曲させて、図3に示すように固定板11と摺動板12とによって挟み(屈曲半径b:1.0mm)、電磁波シールドフィルム14,15の導電層の長さ方向両端部に銅箔(幅10mm)を介して端子(図示せず)を接続して、これらフィルム14,15の抵抗値をそれぞれ測定し、シールド層初期抵抗とした。引き続き、黒丸を基点に矢印の方向にストローク(摺動幅50mm(c=c’=25mm)、60往復/分)させて、シールド層抵抗が100Ωに達したときのストローク回数(往復で「1回」とする)を調べ、「摺動特性」とした。また、上記評価用試料をはんだリフロー工程に3回供した試料についても同様に試験を行った。結果を表1,2に示す。表において、「内曲げ」は屈曲させた際にFPC13の内側となる電磁波シールドフィルム15の抵抗値を示し、「外曲げ」はFPC13の外側となる電磁波シールドフィルム15の抵抗値を示す。
4…銅層、5…ニッケル-金メッキ層、6…接着剤層、
11…固定板、12…摺動板、13…FPC、14,15…電磁波シールドフィルム
Claims (4)
- (A)金属粉と(B)バインダー樹脂とからなる導電層に、保護層が積層されてなる電磁波シールドフィルムであって、
前記導電層が前記金属粉として、(a)平均厚さ50~300nm、平均粒径3~10μmの薄片状金属粉と、(b)平均粒径3~10μmの針状又は樹枝状金属粉とを含有する導電性ペーストから形成されたものである
ことを特徴とする電磁波シールドフィルム。 - 前記導電層における(A)金属粉と(B)バインダー樹脂との割合が、重量比でA:B=50:50~80:20の範囲内(但し、固形分換算)であり、かつ前記(a)薄片状金属粉と(b)針状又は樹枝状金属粉との割合が、重量比でa:b=20:80~80:20の範囲内であることを特徴とする、請求項1に記載の電磁波シールドフィルム。
- フレキシブル基板上に請求項1又は2に記載の電磁波シールドフィルムを載置し、
次いでこの電磁波シールドフィルムと共にフレキシブル基板を厚さ方向に加圧しながら加熱することにより、前記フレキシブル基板上に電磁波シールド層を形成する
ことを特徴とする、フレキシブル基板の製造方法。 - 請求項1又は2に記載の電磁波シールドフィルムからなる電磁波シールド層を有するフレキシブル基板。
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CN201180013319.2A CN102792790B (zh) | 2010-03-11 | 2011-02-25 | 电磁波屏蔽膜、使用其的柔性基板及其制造方法 |
KR1020127022770A KR101751564B1 (ko) | 2010-03-11 | 2011-02-25 | 전자파 시일드 필름, 이를 사용한 플렉시블 기판 및 그 제조 방법 |
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JP6839669B2 (ja) | 2018-01-09 | 2021-03-10 | タツタ電線株式会社 | 電磁波シールドフィルム |
JP7252067B2 (ja) * | 2019-06-12 | 2023-04-04 | 株式会社日立産機システム | 摺動材 |
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TW201206334A (en) | 2012-02-01 |
KR101751564B1 (ko) | 2017-06-27 |
CN102792790B (zh) | 2017-12-19 |
JP2011187895A (ja) | 2011-09-22 |
JP5528857B2 (ja) | 2014-06-25 |
TWI526150B (zh) | 2016-03-11 |
CN102792790A (zh) | 2012-11-21 |
KR20130004903A (ko) | 2013-01-14 |
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