JP6465011B2 - Long film vacuum deposition system - Google Patents

Long film vacuum deposition system Download PDF

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JP6465011B2
JP6465011B2 JP2015242857A JP2015242857A JP6465011B2 JP 6465011 B2 JP6465011 B2 JP 6465011B2 JP 2015242857 A JP2015242857 A JP 2015242857A JP 2015242857 A JP2015242857 A JP 2015242857A JP 6465011 B2 JP6465011 B2 JP 6465011B2
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JP2017110240A (en
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栄三郎 神田
栄三郎 神田
寛人 渡邉
寛人 渡邉
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Sumitomo Metal Mining Co Ltd
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本発明は、スルーホールを有する長尺フィルムにスパッタリング成膜を行う真空成膜装置及び真空成膜方法に関する。   The present invention relates to a vacuum film forming apparatus and a vacuum film forming method for performing sputtering film formation on a long film having a through hole.

電子機器に搭載される液晶ディスプレイのドライバIC搭載用等にはCOF(Chip on Film)が使用されている。COFは、例えばポリイミドフィルムに代表される耐熱性樹脂フィルムの片面にスパッタリング成膜等の乾式めっき法で金属薄膜を成膜した後、この金属薄膜の上に電気めっき等の湿式めっき法で銅層等の金属層を積層し、得られた金属膜付耐熱性樹脂フィルムの金属層部分をパターニングして配線回路を形成することで作製される。上記のスパッタリング成膜で形成した金属層は耐熱性樹脂フィルムとの密着性に優れており、よって信頼性の高い金属膜付耐熱性樹脂フィルムを作製することが可能になる。   COF (Chip on Film) is used for mounting a driver IC of a liquid crystal display mounted on an electronic device. For example, after a metal thin film is formed on one side of a heat-resistant resin film represented by a polyimide film by a dry plating method such as sputtering, a COF is formed on the metal thin film by a wet plating method such as electroplating. The wiring layer is formed by patterning the metal layer portion of the obtained heat-resistant resin film with a metal film and laminating the metal layers. The metal layer formed by the above-described sputtering film formation is excellent in adhesion to the heat resistant resin film, and thus it is possible to produce a highly reliable heat resistant resin film with a metal film.

しかし、スパッタリング成膜法は真空蒸着法に比べて耐熱性樹脂フィルムに与える熱負荷が大きく、耐熱性樹脂フィルムにシワが発生し易いという問題を抱えている。そこで、金属膜付耐熱性樹脂フィルムを連続的に作製する真空成膜装置では、内部に冷却機能を備えた回転駆動式の筒状体からなる冷却ロールが搭載されており、その外周面にロールツーロールで搬送される長尺状の耐熱性樹脂フィルムを巻き付けながら表面側にスパッタリング成膜を施すことにより、熱負荷のかかるスパッタリング成膜によって生じた耐熱性樹脂フィルムの熱を裏面側から冷却することが行われている。   However, the sputtering film forming method has a problem that the heat load applied to the heat resistant resin film is larger than that of the vacuum vapor deposition method, and the heat resistant resin film is likely to be wrinkled. Therefore, in a vacuum film forming apparatus for continuously producing a heat-resistant resin film with a metal film, a cooling roll made of a rotationally driven cylindrical body having a cooling function is mounted inside, and a roll is formed on the outer peripheral surface thereof. The heat of the heat-resistant resin film generated by sputtering film formation with a heat load is cooled from the back side by performing sputtering film formation on the front surface side while winding a long heat-resistant resin film conveyed by two rolls. Things have been done.

例えば特許文献1には、真空成膜装置の一例である巻出巻取式(ロールツーロール方式)の真空スパッタリング装置が開示されている。この真空スパッタリング装置には、上記冷却ロールの役割を担うクーリングロールが具備されている。更に、クーリングロールの少なくとも長尺フィルム送入れ側若しくは送出し側にサブロールが設けられており、これにより長尺フィルムをクーリングロールの外周面に密着させる制御が行われている。   For example, Patent Document 1 discloses an unwinding type (roll-to-roll type) vacuum sputtering apparatus which is an example of a vacuum film forming apparatus. The vacuum sputtering apparatus includes a cooling roll that plays the role of the cooling roll. Further, a sub-roll is provided on at least the long film feeding side or the feeding side of the cooling roll, thereby controlling the long film to be in close contact with the outer peripheral surface of the cooling roll.

ところで、冷却ロールの外周面はミクロ的に見て平坦ではないため、冷却ロールの外周面とそこに巻き付けて搬送される長尺樹脂フィルムとの間には微小な真空空間からなるギャップ部(間隙)が存在しており、この部分が伝熱抵抗になって長尺樹脂フィルムを効率よく冷却できないことがある。そこで、冷却ロール側から上記ギャップ部内にガスを導入してギャップ部内の熱伝導率を高めることがある。例えば特許文献2には、冷却ロールの外周面に全周に亘って多数の微細なガス放出孔を設けて上記ギャップ部にキャンロール側からガスを導入し、これによりスパッタリング成膜や蒸着の際の長尺樹脂フィルムの熱を冷却ロールに効率よく伝熱させる技術が開示されている。   By the way, since the outer peripheral surface of the cooling roll is not flat when viewed microscopically, a gap portion (gap) consisting of a minute vacuum space is formed between the outer peripheral surface of the cooling roll and the long resin film that is wound around the outer peripheral surface. ), And this portion becomes a heat transfer resistance, and the long resin film may not be efficiently cooled. Therefore, gas may be introduced into the gap from the cooling roll side to increase the thermal conductivity in the gap. For example, in Patent Document 2, a large number of fine gas discharge holes are provided on the outer peripheral surface of the cooling roll over the entire circumference, and gas is introduced into the gap portion from the can roll side. A technique for efficiently transferring the heat of the long resin film to the cooling roll is disclosed.

特開昭62−247073号公報Japanese Patent Laid-Open No. 62-247073 国際公開第WO2005/001157号International Publication No. WO2005 / 001157

近年、電子機器の高性能化に伴い、上記したCOFのような片面めっき基板のほか、ポリイミドフィルムなどの樹脂フィルムの両面に銅層等の金属層を成膜したいわゆる両面めっき基板の需要が増大している。両面めっき基板の場合は、樹脂フィルムの表裏面にそれぞれ配設される銅配線回路同士の通電のため、樹脂フィルムの両面の金属膜の成膜に加えて樹脂フィルムを貫通するメタル配線を設けることが必要になる。そのため、両面めっき基板の作製では樹脂フィルムの表裏面にCOFの場合と同様の真空成膜装置を用いた成膜プロセスで銅層等の金属層を成膜した後、この金属層が成膜された樹脂フィルムにレーザーやドリル等を用いてスルーホール用の貫通孔を穿孔し、更にこの貫通孔の内壁面に無電解めっきや電解銅めっきで銅配線を形成することが行われている。   In recent years, with the improvement in performance of electronic devices, demand for so-called double-sided plating substrates in which metal layers such as copper layers are formed on both sides of resin films such as polyimide films, in addition to the above-mentioned single-sided plating substrates such as COF, has increased. doing. In the case of a double-sided plated substrate, in order to energize the copper wiring circuits respectively arranged on the front and back surfaces of the resin film, in addition to the formation of metal films on both sides of the resin film, provide metal wiring that penetrates the resin film. Is required. Therefore, in the production of a double-sided plated substrate, a metal layer such as a copper layer is formed on the front and back surfaces of the resin film by a film formation process using the same vacuum film formation apparatus as in the case of COF, and then this metal layer is formed. A through hole for a through hole is drilled in the resin film using a laser or a drill, and a copper wiring is formed on the inner wall surface of the through hole by electroless plating or electrolytic copper plating.

あるいは、両面めっき基板の他の作製方法として、先ず樹脂フィルムにレーザーやドリル等を用いてスルーホール用の貫通孔を穿孔し、この貫通孔を備えた樹脂フィルムの表裏面にスパッタリングで銅層等の金属層を成膜することもある。この後者の作製方法では、スパッタリング成膜時にスルーホール用貫通孔の内壁面にも樹脂フィルムの表裏面と同様のスパッタ膜を成膜できるので、少ない工程で効率よく作製できるという利点がある。   Alternatively, as another method for producing a double-sided plated substrate, first, a through hole for a through hole is drilled in a resin film using a laser or a drill, and a copper layer or the like is formed by sputtering on the front and back surfaces of the resin film having the through hole. The metal layer may be formed. This latter production method has an advantage that it can be produced efficiently with fewer steps because a sputtered film similar to the front and back surfaces of the resin film can be formed on the inner wall surface of the through-hole through-hole during sputtering film formation.

しかしながら、スルーホール用の貫通孔を有する長尺の樹脂フィルムにロールツーロール方式の真空成膜装置を用いて連続的にスパッタリング成膜を行うと、冷却ロールの外周面のうち樹脂フィルムの貫通孔に対応する部位にスパッタ膜が徐々に付着していき、そのまま運転を続けると冷却ロールの冷却能力が低下する問題が生ずることがあった。そのため、定期的に冷却ロールの外周面の付着物を除去する作業が必要となり、連続的な成膜が妨げられることが問題になっていた。   However, when the sputter film is continuously formed on a long resin film having through holes for through holes using a roll-to-roll vacuum film forming apparatus, the through holes of the resin film on the outer peripheral surface of the cooling roll When the sputtered film gradually adheres to the part corresponding to the above and the operation is continued as it is, there is a problem that the cooling capacity of the cooling roll is lowered. For this reason, it is necessary to periodically remove the deposits on the outer peripheral surface of the cooling roll, which hinders continuous film formation.

本発明は、上記したように、従来の真空成膜装置を用いて両面めっき基板を作製する際に生じる問題に鑑みてなされたものであり、スルーホール用の貫通孔を有する長尺樹脂フィルムに連続的にスパッタ膜を成膜することが可能な真空成膜装置及び真空成膜法を提供することを目的としている。   As described above, the present invention has been made in view of the problems that occur when a double-sided plating substrate is produced using a conventional vacuum film forming apparatus, and a long resin film having through holes for through holes. An object of the present invention is to provide a vacuum film forming apparatus and a vacuum film forming method capable of continuously forming a sputtered film.

上記目的を達成するため、本発明に係る長尺フィルムの真空成膜装置は、貫通孔を有する長尺フィルムを真空チャンバー内においてロールツーロールで搬送する搬送機構と、該長尺フィルムに対して熱負荷の掛かる成膜処理を施す成膜処理手段と、内部に冷媒循環路を有し且つ該長尺フィルムを巻き付けて冷却する外周面を有する冷却ロールと、該冷却ロールの外周面とそこに巻き付けられる該長尺フィルムとの間に介在する長尺の介在フィルムをロールツーロールで搬送する第2の搬送機構とを備えており、前記介在フィルムは、内径0.03〜1mmの複数の貫通孔を有する膜か、あるいはガス透過性のある材質からなることを特徴としている。 In order to achieve the above object, a vacuum film forming apparatus for a long film according to the present invention includes a transport mechanism for transporting a long film having a through-hole by roll-to-roll in a vacuum chamber, and the long film. Film forming processing means for performing a film forming process with a heat load, a cooling roll having a refrigerant circulation path inside and having an outer peripheral surface for winding and cooling the long film, an outer peripheral surface of the cooling roll, and A second transport mechanism that transports a long intervening film interposed between the long film to be wound by roll-to-roll, and the intervening film has a plurality of through holes having an inner diameter of 0.03 to 1 mm. It is characterized by being made of a film having pores or a material having gas permeability .

本発明によれば、冷却ロールを搭載した真空製膜装置を用いてスルーホール用の貫通孔を有する長尺樹脂フィルムに連続的にスパッタ成膜を行うに際して、当該冷却ロールの外周面にスパッタ膜を付着させることなく良好にスパッタ成膜を施すことが可能になる。   According to the present invention, when a sputter film is continuously formed on a long resin film having through holes for through holes using a vacuum film forming apparatus equipped with a cooling roll, a sputter film is formed on the outer peripheral surface of the cooling roll. It is possible to satisfactorily form a sputter film without adhering.

本発明の成膜装置の一具体例を示す模式的な部分正面図である。It is a typical partial front view which shows one specific example of the film-forming apparatus of this invention. 図1の成膜装置に好適に搭載される冷却ロールの縦断面図である。It is a longitudinal cross-sectional view of the cooling roll suitably mounted in the film-forming apparatus of FIG. 長尺フィルムに貫通孔を穿孔する穿孔装置の模式的な正面図である。It is a typical front view of the punching apparatus which punches a through-hole in a long film.

以下、本発明に係る真空成膜装置の一具体例として、図1に示すロールツーロール方式のスパッタリング装置を参照しながら説明する。この図1に示すスパッタリング装置は、スパッタリングウェブコータとも称される装置であり、ロールツーロールで搬送される長尺樹脂フィルムFを内部に冷却機構を備えた冷却ロールの外周面に巻き付けて裏面側から冷却しながら該長尺樹脂フィルムFに対してスパッタ成膜を行うものであり、該長尺樹脂フィルムFにシワを生じさせることなく熱負荷の掛かるスパッタ成膜処理を連続的に施すことができる。   Hereinafter, a specific example of the vacuum film-forming apparatus according to the present invention will be described with reference to a roll-to-roll sputtering apparatus shown in FIG. The sputtering apparatus shown in FIG. 1 is an apparatus that is also called a sputtering web coater, and winds a long resin film F conveyed by roll-to-roll around the outer peripheral surface of a cooling roll provided with a cooling mechanism inside, and the back side. Sputter film formation is performed on the long resin film F while cooling from below, and a sputter film formation process that is subjected to a heat load without causing wrinkles on the long resin film F can be continuously performed. it can.

具体的に説明すると、この図1に示す真空成膜装置は図示しない真空チャンバー内に搭載されており、長尺樹脂フィルムFの巻き出し及び巻き取りをそれぞれ行う巻出ロール1及び巻取ロール2と、これら巻出ロール1から巻取ロール2までロールツーロールで搬送される長尺樹脂フィルムFを外周面に巻き付けて冷却する回転駆動式の冷却ロール3と、長尺樹脂フィルムFを冷却ロール3の外周面に密着させるべく冷却ロール3の周速度に対する調整が行われる回転駆動式のフィードロール4、5とが配設されている。これらロール群からなる搬送機構に加えて、長尺樹脂フィルムFの搬送を適宜ガイドするフリーロールや長尺樹脂フィルムFの張力の測定を行う張力センサロールが設けられることもある。   More specifically, the vacuum film forming apparatus shown in FIG. 1 is mounted in a vacuum chamber (not shown), and an unwinding roll 1 and a winding roll 2 for unwinding and winding the long resin film F, respectively. And a rotation drive type cooling roll 3 that winds and cools the long resin film F conveyed from the unwinding roll 1 to the winding roll 2 by roll-to-roll around the outer peripheral surface, and the long resin film F as a cooling roll. Rotation-driven feed rolls 4 and 5 are provided that adjust the peripheral speed of the cooling roll 3 so as to be in close contact with the outer peripheral surface of the cooling roll 3. In addition to the transport mechanism composed of these roll groups, a free roll for appropriately guiding the transport of the long resin film F and a tension sensor roll for measuring the tension of the long resin film F may be provided.

冷却ロール3は例えば外径400mm程度の金属製の筒状体で構成されており、内部に冷却水等の冷媒が循環する流路が設けられている。更に、外周面に巻き付いている長尺樹脂フィルムFの冷却効率を高めるため、必要に応じて外周面からガスを放出するガス放出機構を備えていてもよい。ガス放出機構を備えた冷却ロールの具体例について図2を参照しながら説明する。図2に示すように、冷却ロール3は金属製の円筒ロール11で主に構成されており、その内側に内筒部12が設けられている。この2重構造部分の内側に冷却水などの冷媒が流通する冷媒循環路12aが形成されている。この冷媒循環路12a内の冷媒は円筒ロール11の回転中心軸O部分に設けられた2重管13を介して真空チャンバー外部の冷媒冷却装置(図示せず)との間で循環できるようになっている。   The cooling roll 3 is made of a metal cylindrical body having an outer diameter of about 400 mm, for example, and a flow path through which a coolant such as cooling water circulates is provided. Furthermore, in order to improve the cooling efficiency of the long resin film F wound around the outer peripheral surface, a gas release mechanism for releasing gas from the outer peripheral surface may be provided as necessary. A specific example of a cooling roll having a gas release mechanism will be described with reference to FIG. As shown in FIG. 2, the cooling roll 3 is mainly composed of a metal cylindrical roll 11, and an inner cylinder portion 12 is provided on the inner side thereof. A refrigerant circulation path 12a through which a refrigerant such as cooling water flows is formed inside the double structure portion. The refrigerant in the refrigerant circulation path 12a can be circulated with a refrigerant cooling device (not shown) outside the vacuum chamber via a double pipe 13 provided at the rotation center axis O portion of the cylindrical roll 11. ing.

円筒ロール11の外周肉厚部には回転中心軸Oの方向に延在する複数のガス導入路14が周方向に略均等な間隔をあけて全周に亘って設けられており、これら複数のガス導入路14の各々に、回転中心軸Oの方向に沿って略均等な間隔をあけて外周面で開口する内径30〜1000μm程度の複数のガス放出孔15が設けられている。円筒ロール11の一端部には、これら複数のガス導入路14にガスを分配して供給するガスロータリージョイント16が設けられており、真空チャンバー外部の図示しないガス供給源からガス供給ライン17を介して導入されたガスは複数のガス導入路14及びそれらの各々が有する複数のガス放出孔15を経て円筒ロール11の外周面から放出される。これにより、冷却ロール3の外周面とそこに巻き付いている長尺樹脂フィルムFとの間のギャップ部にガスが導入される   A plurality of gas introduction paths 14 extending in the direction of the rotation center axis O are provided in the outer peripheral thick portion of the cylindrical roll 11 over the entire circumference at substantially equal intervals in the circumferential direction. Each of the gas introduction paths 14 is provided with a plurality of gas discharge holes 15 having an inner diameter of about 30 to 1000 μm that open at the outer peripheral surface at substantially equal intervals along the direction of the rotation center axis O. A gas rotary joint 16 that distributes and supplies gas to the plurality of gas introduction paths 14 is provided at one end of the cylindrical roll 11, and from a gas supply source (not shown) outside the vacuum chamber via a gas supply line 17. The introduced gas is discharged from the outer peripheral surface of the cylindrical roll 11 through the plurality of gas introduction paths 14 and the plurality of gas discharge holes 15 included in each of them. Thereby, gas is introduce | transduced into the gap part between the outer peripheral surface of the cooling roll 3, and the elongate resin film F wound around there.

なお、これらガス導入路14の本数や各ガス導入路14が有するガス放出孔15の個数は、冷却ロール3の外周面のうち長尺樹脂フィルムFが巻き付く角度範囲(抱き角とも称する)、長尺樹脂フィルムFの張力、ガスの必要放出量等に応じて適宜定められる。また、ガスロータリージョイント16には上記の抱き角以外の角度範囲に位置するガス導入路14に対してはガスの供給を遮断できるようなガス供給制御手段を備えることが好ましい。このようなガス供給制御手段としては、例えばガスロータリージョイント16を構成する回転部内の各ガス導入路に対応する流路を回転に伴って機械的に開閉させたり、該回転部の流路にバルブ等を設けて電気的又は電磁気的に開閉させたりする方法がある。   In addition, the number of these gas introduction paths 14 and the number of gas discharge holes 15 included in each gas introduction path 14 are an angular range (also referred to as a holding angle) around which the long resin film F is wound on the outer peripheral surface of the cooling roll 3. It is determined as appropriate according to the tension of the long resin film F, the required gas release amount, and the like. Moreover, it is preferable that the gas rotary joint 16 is provided with a gas supply control means capable of shutting off the supply of gas to the gas introduction path 14 located in an angle range other than the above-mentioned holding angle. As such a gas supply control means, for example, the flow path corresponding to each gas introduction path in the rotating part constituting the gas rotary joint 16 is mechanically opened and closed with rotation, or a valve is connected to the flow path of the rotating part. There is a method of opening and closing electrically or electromagnetically.

再度図1に戻ると、本発明の一具体例の真空成膜装置は、前述した長尺樹脂フィルムFが長尺状の介在フィルムSを介して冷却ロール3の外周面に巻き付くようにするため、当該介在フィルムSの巻き出し及び巻き取りをそれぞれ行う第2巻出ロール6及び第2巻取ロール7が第2の搬送機構として設けられている。これにより、巻出ロール1から巻き出された長尺樹脂フィルムFは、第2巻出ロール6から巻き出された介在フィルムSとフィードロール4の外周面上で重なり、そのまま冷却ロール3に送られる。そして、長尺樹脂フィルムFは、冷却ロール3の外周面に介在フィルムSを介して巻き付けられる。つまり、冷却ロール3の外周面とそこに巻き付けられる長尺樹脂フィルムFとの間には介在フィルムSが挟まれた状態で介在する。   Returning to FIG. 1 again, the vacuum film forming apparatus of one specific example of the present invention causes the above-described long resin film F to wrap around the outer peripheral surface of the cooling roll 3 via the long intervening film S. Therefore, a second unwinding roll 6 and a second winding roll 7 that respectively unwind and wind the intervening film S are provided as a second transport mechanism. Thereby, the long resin film F unwound from the unwinding roll 1 is overlapped on the outer peripheral surface of the feed roll 4 and the intervening film S unwound from the second unwinding roll 6, and is sent to the cooling roll 3 as it is. It is done. Then, the long resin film F is wound around the outer peripheral surface of the cooling roll 3 via the intervening film S. That is, the intervening film S is interposed between the outer peripheral surface of the cooling roll 3 and the long resin film F wound there.

冷却ロール3の外周面に対向する位置には成膜処理手段として図示しない1又は複数個のスパッタターゲットが設けられており、これにより長尺樹脂フィルムFの表面にスパッタ成膜が施される。その際、上記したように、冷却ロール3の外周面とそこに巻き付けられる長尺樹脂フィルムFとの間に介在フィルムSが介在しているので、スルーホール用の貫通孔を有する長尺樹脂フィルムFのスパッタ成膜時に、該貫通孔を通り抜けて冷却ロール3の外周面に向かうスパッタ粒子は、介在フィルムSに遮られてその表面上に堆積するので冷却ロール3の外周面には堆積しなくなる。これにより、冷却ロール3の外周面の堆積物の除去が不要になるので、長尺樹脂フィルムFに対して連続的にスパッタ成膜を行うことが可能になる。   One or a plurality of sputter targets (not shown) are provided as film forming processing means at a position facing the outer peripheral surface of the cooling roll 3, and thereby sputter film formation is performed on the surface of the long resin film F. At that time, as described above, since the intervening film S is interposed between the outer peripheral surface of the cooling roll 3 and the long resin film F wound therearound, the long resin film having through holes for through holes. During the sputter deposition of F, the sputtered particles passing through the through-hole and going to the outer peripheral surface of the cooling roll 3 are blocked by the intervening film S and accumulate on the surface, so that they do not accumulate on the outer peripheral surface of the cooling roll 3. . This eliminates the need for removal of deposits on the outer peripheral surface of the cooling roll 3, so that it is possible to continuously perform sputter deposition on the long resin film F.

また、本発明の一具体例の真空成膜装置は、前述したように冷却ロール3がガス放出機構を備えているので、上記の長尺樹脂フィルムFのスパッタ成膜の際に、冷却ロール3の外周面とそこに巻き付いている介在フィルムSとの間のギャップ部に伝熱効率を高める気体が導入されることになる。これにより、介在フィルムSが介在することによって低下した冷却効率をある程度補うことが可能になる。   In the vacuum film forming apparatus of one specific example of the present invention, since the cooling roll 3 includes the gas release mechanism as described above, the cooling roll 3 is formed when the long resin film F is formed by sputtering. A gas that enhances the heat transfer efficiency is introduced into the gap between the outer peripheral surface of the film and the intervening film S wound therearound. As a result, it is possible to compensate to some extent the cooling efficiency reduced by the interposition of the intervening film S.

スパッタ成膜を終えた長尺樹脂フィルムFはフィードロール5を経て巻取ロール2で巻き取られる。一方、長尺樹脂フィルムFと冷却ロール3の外周面との間に挟まった状態で介在していた介在フィルムSは、フィードロール5の外周面上で長尺樹脂フィルムFから分かれた後、第2巻取ロール7で巻き取られる。   The long resin film F that has been subjected to the sputtering film formation is wound up by the winding roll 2 through the feed roll 5. On the other hand, after the intervening film S interposed between the long resin film F and the outer peripheral surface of the cooling roll 3 is separated from the long resin film F on the outer peripheral surface of the feed roll 5, It is wound up by two winding rolls 7.

介在フィルムSは厚みが6〜25μmであるのが好ましい。この厚みが6μm未満では介在フィルムのハンドリングが困難になり、介在フィルムSにシワ等が発生しやすくなる。一方、介在フィルムSの厚みが25μmを超えると、冷却ロール3の外周面とそこに巻き付く長尺樹脂フィルムFとの間の伝熱効率が顕著に低下し、スパッタ成膜中の除熱が不十分になって長尺樹脂フィルムFにシワが発生しやすくなる。   The intervening film S preferably has a thickness of 6 to 25 μm. If this thickness is less than 6 μm, handling of the intervening film becomes difficult, and wrinkles and the like are likely to occur in the intervening film S. On the other hand, when the thickness of the intervening film S exceeds 25 μm, the heat transfer efficiency between the outer peripheral surface of the cooling roll 3 and the long resin film F wound around the cooling roll 3 is remarkably lowered, and heat removal during sputter deposition is not performed. It becomes sufficient and wrinkles are likely to occur in the long resin film F.

介在フィルムSはガス透過性を有する材質からなるのが好ましい。介在フィルムSがガス透過性を有していれば、冷却ロール3の外周面から放出したガスが介在フィルムSを透過してその表側のギャップ部空間と裏側のギャップ部空間との間を比較的自由に移動することができるので伝熱効率が向上し、長尺樹脂フィルムFをより効率よく冷却することが可能になる。これにより、スパッタ成膜時の長尺樹脂フィルムFのシワ発生をより一層低減させることが可能になる。   The intervening film S is preferably made of a material having gas permeability. If the intervening film S has gas permeability, the gas released from the outer peripheral surface of the cooling roll 3 permeates through the intervening film S so that the gap between the front gap portion and the rear gap portion space is relatively small. Since it can move freely, heat transfer efficiency improves and it becomes possible to cool the long resin film F more efficiently. Thereby, it becomes possible to further reduce wrinkling of the long resin film F during sputtering film formation.

ガス透過性の介在フィルムは、搬送性、薄さ、耐熱性、コスト等の面から考えて、ポリエチレンテレフタレート(PET)フィルムにレーザーやプレスにより穿孔加工を施したものを用いるのが良い。あるいは、必要に応じて気体透過性の多孔質フィルム(例えば日東電工株式会社製のサンマップ(登録商標))や不織布を用いてもよい。レーザーやプレスにより穿孔する場合は、好適には内径0.03〜1mm、より好適には内径0.1〜0.2mmの貫通孔を5〜30mm程度のピッチで穿孔するのが好ましい。貫通孔の内径が0.03mm未満ではガスの透過性が低下するので好ましくない。一方、内径が1mmを超えると、介在フィルムのバリア機能が低下し、冷却ロール3の外周面にスパッタ粒子が堆積しやすくなる。なお、レーザーやプレスにより穿孔する場合は、長尺フィルムと共にキャンロールに巻き付けた際に各孔の位置が長尺フィルムのスルーホールの位置とずれているのが好ましい。   As the gas-permeable intervening film, it is preferable to use a polyethylene terephthalate (PET) film that has been perforated by a laser or a press in consideration of transportability, thinness, heat resistance, cost, and the like. Alternatively, a gas-permeable porous film (for example, Sunmap (registered trademark) manufactured by Nitto Denko Corporation) or a nonwoven fabric may be used as necessary. When drilling with a laser or a press, it is preferable to drill through holes with an inner diameter of 0.03 to 1 mm, more preferably with an inner diameter of 0.1 to 0.2 mm at a pitch of about 5 to 30 mm. If the inner diameter of the through hole is less than 0.03 mm, the gas permeability decreases, which is not preferable. On the other hand, when the inner diameter exceeds 1 mm, the barrier function of the intervening film is lowered, and the sputtered particles are easily deposited on the outer peripheral surface of the cooling roll 3. In addition, when piercing | punching with a laser or a press, when it winds around a can roll with a long film, it is preferable that the position of each hole has shifted | deviated from the position of the through-hole of a long film.

上記した本発明の真空成膜装置では、介在フィルムSの搬送速度とスパッタ成膜される長尺樹脂フィルムFの搬送速度とはほぼ同一であるのが望ましい。これらの搬送速度をほぼ同一にすることで長尺樹脂フィルムFにスリ傷等が生じるのを防ぐことができる。また、介在フィルムSの張力と長尺樹脂フィルムFの張力をそれぞれ測定する張力センサーロール(張力ピックアップロール)等を別々に設けてこれら張力を別々に調整するのが好ましい。この場合、介在フィルムS側の張力を高めに設定するのが好ましく、これにより冷却ロール3の外周面への密着力が向上して接触面積が広くなり、冷却ロール3の冷却効率をより一層高めることができる。その結果、長尺樹脂フィルムFにシワが発生しにくくなる。   In the vacuum film forming apparatus of the present invention described above, it is desirable that the conveying speed of the intervening film S and the conveying speed of the long resin film F to be sputtered are substantially the same. By making these conveyance speeds substantially the same, it is possible to prevent the long resin film F from being scratched. Moreover, it is preferable to separately provide tension sensor rolls (tension pickup rolls) or the like for measuring the tension of the intervening film S and the tension of the long resin film F, respectively, and adjust these tensions separately. In this case, it is preferable to set the tension on the intervening film S side to be higher, thereby improving the adhesion to the outer peripheral surface of the cooling roll 3 and increasing the contact area, further increasing the cooling efficiency of the cooling roll 3. be able to. As a result, wrinkles are unlikely to occur in the long resin film F.

本発明の真空成膜装置を用いて金属薄膜付耐熱性樹脂フィルムを製造する場合は、樹脂フィルムにポリイミドフィルム、液晶ポリマーフィルムのような耐熱性樹脂フィルムや、PETフィルムのような樹脂フィルムを用いることができる。この樹脂フィルムには、予めスルーホール用の貫通孔が穿孔されており、その穿孔には例えば図3に示すような第3巻出ロール21及び第3巻取ロールによってロールツーロールで搬送される長尺樹脂フィルムFに上方からレーザーを照射して穿孔する穿孔装置23を用いることで効率よく穿孔することができる。   When a heat-resistant resin film with a metal thin film is produced using the vacuum film-forming apparatus of the present invention, a heat-resistant resin film such as a polyimide film or a liquid crystal polymer film, or a resin film such as a PET film is used as the resin film. be able to. This resin film has through holes for through holes in advance, and the holes are conveyed by roll-to-roll by a third unwinding roll 21 and a third winding roll as shown in FIG. 3, for example. The long resin film F can be efficiently perforated by using the perforating device 23 that perforates by irradiating laser from above.

スパッタ成膜で形成する金属薄膜は、例えばNi−Cr合金等のNi系合金からなるシード層とその上のCu膜との積層膜からなる。このような金属薄膜を有する金属薄膜付樹脂フィルムは、更に湿式めっき法を用いて金属薄膜を厚くすることができる。この場合の湿式めっき法には、電気めっき処理のみで金属膜を積層する場合のほか、一次めっきとしての無電解めっき処理と、二次めっきとしての電解めっき処理とを組み合わせて行う場合がある。このようにして厚膜化された金属膜に対して、例えばサブトラクティブ法やアディティブ法でパターニング加工することで配線回路を形成することができる。   The metal thin film formed by sputtering film formation is a laminated film of a seed layer made of a Ni-based alloy such as a Ni—Cr alloy and a Cu film thereon. The resin film with a metal thin film having such a metal thin film can be further thickened using a wet plating method. In this case, the wet plating method may be performed by combining electroless plating treatment as primary plating and electrolytic plating treatment as secondary plating in addition to the case of laminating a metal film only by electroplating treatment. A wiring circuit can be formed by patterning the metal film thus thickened by, for example, a subtractive method or an additive method.

[実施例1]
図1に示す真空成膜装置を用いて貫通孔を有する長尺フィルムFにスパッタ成膜を施した。なお、冷却ロール3には図2に示すガス放出機構付きの冷却ロールを用いたが、ガス供給ライン17にはガスを供給しないで運転した。長尺フィルムFには、前もってレーザーにて内径約0.05mmのスルーホール用の貫通孔を複数穿孔した、厚さ25μm、幅500mmのポリイミドフィルムを使用した。介在フィルムSには、厚さ約12μm、幅500mmのPETフィルムを使用した。
[Example 1]
Sputter film formation was performed on the long film F having a through hole using the vacuum film formation apparatus shown in FIG. In addition, although the cooling roll with the gas discharge | release mechanism shown in FIG. 2 was used for the cooling roll 3, it operated without supplying gas to the gas supply line 17. FIG. For the long film F, a polyimide film having a thickness of 25 μm and a width of 500 mm, in which a plurality of through holes for a through hole having an inner diameter of about 0.05 mm were previously drilled with a laser, was used. As the intervening film S, a PET film having a thickness of about 12 μm and a width of 500 mm was used.

これらフィルムを共に搬送速度0.5m/分で搬送し、厚さ約35ÅのNi−Cr層と、その上の厚さ約1000Åの銅層とを成膜したところ、長尺フィルムFにシワは生じなかった。また、介在フィルムSの表面上の長尺フィルムFの貫通孔に対応する部位にスパッタ粒子が堆積していたが、冷却ロール3の外周面にはスパッタ粒子の堆積は生じていなかった。そのため、連続的に成膜することができた。   Both of these films were transported at a transport speed of 0.5 m / min, and when a Ni—Cr layer having a thickness of about 35 mm and a copper layer having a thickness of about 1000 mm thereon were formed, wrinkles were found on the long film F. Did not occur. Further, although sputtered particles were deposited on the surface of the intervening film S corresponding to the through-holes of the long film F, sputtered particles were not deposited on the outer peripheral surface of the cooling roll 3. Therefore, the film could be continuously formed.

[比較例1]
介在フィルムSを冷却ロール3の外周面とそこに巻き付く長尺フィルムFとの間に介在させなかった以外は実施例1と同様にして貫通孔を有する長尺フィルムFにスパッタ成膜を施した。その結果、長尺フィルムFにシワは生じなかったものの、冷却ロール3の外周面のうち、長尺フィルムFの貫通孔に対応する部位に点状に成膜跡が発生していた。
[Comparative Example 1]
Except that the intervening film S was not interposed between the outer peripheral surface of the cooling roll 3 and the long film F wound therearound, the long film F having through holes was formed by sputtering in the same manner as in Example 1. did. As a result, although wrinkles did not occur in the long film F, the film formation traces were generated in the form of dots on the outer peripheral surface of the cooling roll 3 corresponding to the through holes of the long film F.

[実施例2]
ガス放出機構付き冷却ロールのガス放出孔15からArガスを微量放出することで冷却ロール3の外周面とそこに巻き付く介在フィルムSとの間のギャップ部にArガスを充満させたことと、搬送速度を0.7m/分にした以外は実施例1と同様にして貫通孔を有する長尺フィルムFにスパッタ成膜を施した。その結果、長尺フィルムFにシワは生じておらず、連続的に成膜することができた。次に、搬送速度を徐々に上げて1.1m/分にしたところ、スパッタ成膜中に長尺フィルムFにシワが入った。
[Example 2]
Ar gas was filled in the gap portion between the outer peripheral surface of the cooling roll 3 and the intervening film S wound around by releasing a small amount of Ar gas from the gas discharge hole 15 of the cooling roll with a gas release mechanism; Sputter deposition was performed on the long film F having through holes in the same manner as in Example 1 except that the conveyance speed was 0.7 m / min. As a result, the long film F was not wrinkled and could be continuously formed. Next, when the conveyance speed was gradually increased to 1.1 m / min, the long film F was wrinkled during sputtering film formation.

更に比較のため、搬送速度を1.1m/分から0.7m/分に戻し、ガス放出孔15からガスを放出させずに上記と同様の条件で成膜を行った。その結果、スパッタ成膜中に長尺フィルムFにシワが生じていた。   Further, for comparison, the transport speed was returned from 1.1 m / min to 0.7 m / min, and film formation was performed under the same conditions as described above without discharging gas from the gas discharge hole 15. As a result, the long film F was wrinkled during sputtering film formation.

[実施例3]
介在フィルムSとして、レーザーにて内径0.05mmの孔をあけたPETを使用したことと、搬送速度を2m/分にしたこと以外は実施例2と同様にして貫通孔を有する長尺フィルムFにスパッタ成膜を施した。その結果、スパッタ成膜中に長尺フィルムFにシワが生じなかった。なお、介在フィルムSの貫通孔と長尺フィルムFの貫通孔の位置は、互いに幅方向にずれた位置となるように穿孔しておいたので、スパッタ成膜時に冷却ロール3の外周面上でこれら貫通孔の位置が一致することはなかった。
[Example 3]
As the intervening film S, a long film F having through-holes in the same manner as in Example 2 except that PET having a hole with an inner diameter of 0.05 mm was used with a laser and the conveyance speed was 2 m / min. Was sputtered. As a result, the long film F was not wrinkled during sputter deposition. In addition, since the positions of the through-holes of the intervening film S and the through-holes of the long film F are perforated so as to be shifted from each other in the width direction, on the outer peripheral surface of the cooling roll 3 at the time of sputtering film formation. The positions of these through holes did not match.

上記の実施例及び比較例の結果から、スルーホール用の貫通孔を有する長尺フィルムを搬送しながら真空中でスパッタ成膜する際、冷却ロールの外周面とそこに巻き付く長尺フィルムとの間に該長尺フィルムとは別途搬送される介在フィルムを介在させることで、冷却ロールの外周面へのスパッタ粒子の付着を防止できることが分かった。また、冷却ロールの外周面と介在フィルムとの間に伝熱用の気体を導入することで、介在フィルムが介在することによるフィルムの冷却効果の低下を補えることが分かった。更に、ガス透過性の介在フィルムを用いることで、介在フィルムと成膜される長尺フィルムとの伝熱効率を高めて該長尺フィルムの温度上昇を抑えることができ、シワの発生を抑え得ることが分かった。   From the results of the above Examples and Comparative Examples, when carrying out sputter deposition in vacuum while transporting a long film having through holes for through holes, the outer peripheral surface of the cooling roll and the long film wound around the outer surface It was found that by interposing an intervening film conveyed separately from the long film between them, it is possible to prevent adhesion of sputtered particles to the outer peripheral surface of the cooling roll. Moreover, it turned out that the fall of the cooling effect of the film by interposing an intervening film can be compensated by introduce | transducing the gas for heat transfer between the outer peripheral surface of a cooling roll and an intervening film. Furthermore, by using a gas-permeable intervening film, the heat transfer efficiency between the intervening film and the long film to be formed can be increased, the temperature rise of the long film can be suppressed, and the generation of wrinkles can be suppressed. I understood.

F 樹脂フィルム
S 介在フィルム
1 巻出ロール
2 巻取ロール
3 冷却ロール
4、5 フィードロール
6 第2巻出ロール
7 第2巻取ロール
11 円筒ロール
12 内筒部
12a 冷媒循環路
13 2重管
14 ガス導入路
15 ガス放出孔
16 ガスロータリージョイント
17 ガス供給ライン
21 第3巻出ロール
22 第3巻取ロール
23 穿孔装置
F Resin film S Intervening film 1 Unwinding roll 2 Rewinding roll 3 Cooling roll 4, 5 Feed roll 6 Second unwinding roll 7 Second winding roll 11 Cylindrical roll 12 Inner cylinder part 12a Refrigerant circulation path 13 Double pipe 14 Gas introduction path 15 Gas discharge hole 16 Gas rotary joint 17 Gas supply line 21 3rd unwinding roll 22 3rd winding roll 23 Punching device

Claims (3)

貫通孔を有する長尺フィルムを真空チャンバー内においてロールツーロールで搬送する搬送機構と、該長尺フィルムに対して熱負荷の掛かる成膜処理を施す成膜処理手段と、内部に冷媒循環路を有し且つ該長尺フィルムを巻き付けて冷却する外周面を有する冷却ロールと、該冷却ロールの外周面とそこに巻き付けられる該長尺フィルムとの間に介在する長尺の介在フィルムをロールツーロールで搬送する第2の搬送機構とを備えており、前記介在フィルムは、内径0.03〜1mmの複数の貫通孔を有する膜か、あるいはガス透過性のある材質からなることを特徴とする長尺フィルムの真空成膜装置。 A transport mechanism for transporting a long film having a through-hole by roll-to-roll in a vacuum chamber, a film-forming processing means for performing a film-forming process on the long film with a thermal load, and a refrigerant circulation path inside. Roll-to-roll comprising a cooling roll having an outer peripheral surface for winding and cooling the long film, and a long intervening film interposed between the outer peripheral surface of the cooling roll and the long film wound around the cooling roll The intervening film is made of a film having a plurality of through holes having an inner diameter of 0.03 to 1 mm or a gas permeable material. Vacuum film deposition equipment for long film. 前記冷却ロールは、周方向に略均等な間隔をあけて全周に亘って配設された複数のガス導入路を有しており、これら複数のガス導入路の各々は該冷却ロールの回転軸方向に沿って略均等な間隔をあけて外周面側に開口する複数のガス導入孔を有していることを特徴とする、請求項1に記載の長尺フィルムの真空成膜装置。   The cooling roll has a plurality of gas introduction paths arranged over the entire circumference at substantially equal intervals in the circumferential direction, and each of the plurality of gas introduction paths is a rotating shaft of the cooling roll. The long film vacuum film-forming apparatus according to claim 1, further comprising a plurality of gas introduction holes that open to the outer peripheral surface side at substantially equal intervals along the direction. 前記長尺フィルム及び前記介在フィルムの搬送張力をそれぞれ個別の調整する2つの張力調整機構を有することを特徴とする、請求項1又は2に記載の長尺フィルムの真空成膜装置。 3. The long film vacuum film forming apparatus according to claim 1, further comprising two tension adjusting mechanisms for individually adjusting the transport tensions of the long film and the intervening film.
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