JP2011159921A - Method of manufacturing multilayer printed wiring board, substrate holder, and shielding plate - Google Patents

Method of manufacturing multilayer printed wiring board, substrate holder, and shielding plate Download PDF

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JP2011159921A
JP2011159921A JP2010022420A JP2010022420A JP2011159921A JP 2011159921 A JP2011159921 A JP 2011159921A JP 2010022420 A JP2010022420 A JP 2010022420A JP 2010022420 A JP2010022420 A JP 2010022420A JP 2011159921 A JP2011159921 A JP 2011159921A
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base material
circuit
shielding plate
substrate holder
wiring board
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JP5406065B2 (en
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Takeshi Kokufuda
猛 国府田
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Nippon Mektron KK
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Abstract

<P>PROBLEM TO BE SOLVED: To form a plating film only on one surface of a multilayer printed wiring board where a via hole is opened by an inexpensive and stable method of manufacturing a substrate. <P>SOLUTION: A double-sided copper clad laminate 4 wherein copper foils 2 and 3 are formed on both surfaces of a flexible insulation base material 1, respectively, and a single-sided copper clad laminate 8 wherein a copper foil 7 is formed on one surface of a flexible insulation base material 6 are bonded together by an adhesive 5 to fabricate a three-layer circuit base material 9. A non-through-hole 10 for establishing electroconductivity is formed from one surface side of the circuit base material 9 and then an electroconductivity process is performed on the hole 10. Then, the circuit base material 9 is mounted on a substrate holder (not shown in Figure), and a shielding plate 13 is disposed on the rear surface side of the circuit base material 9. Then, electrolytic plating process is performed. Consequently, a single-sided plating film is formed only on the copper foil 2 on the hole 10 side (via hole opened surface side) and a portion of the hole 10 that has been subjected to the electroconductivity process and there is no plating process performed on the copper foil 7 on the rear surface side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、多層プリント配線板の製造方法及び基板保持具、並びに遮蔽板に関するものであり、特に、ビアホール開口面のみにめっき処理を施す片面めっきによる多層フレキシブルプリント配線板の製造方法、及びその多層プリント配線板の製造に用いられる基板保持具、並びに遮蔽板に関するものである。   TECHNICAL FIELD The present invention relates to a method for manufacturing a multilayer printed wiring board, a substrate holder, and a shielding plate, and in particular, a method for manufacturing a multilayer flexible printed wiring board by single-side plating in which only a via hole opening surface is plated, and the multilayer The present invention relates to a substrate holder used for manufacturing a printed wiring board and a shielding plate.

近年、携帯電話などの小型電子機器に搭載された実装基板は、微細化及び高密度化の要求が一段と高まってきている。このような実装基板に対する微細化及び高密度化の技術の一環として、各種電子部品を実装する実装基板部とフレキシブルケーブル部とを一体化した、いわゆる可撓性ケーブル部を有する多層フレキシブルプリント配線板に関する技術が開示され、この技術に基づく多層フレキシブルプリント配線板が携帯電話などの小型電子機器の用途を中心に広く普及している(例えば、特許文献1、特許文献2参照)。   In recent years, mounting substrates mounted on small electronic devices such as mobile phones have been increasingly demanded for miniaturization and high density. A multilayer flexible printed wiring board having a so-called flexible cable part in which a mounting board part for mounting various electronic components and a flexible cable part are integrated as part of the technology for miniaturization and densification of such a mounting board. The multilayer flexible printed wiring board based on this technique is widely spread mainly for the use of small electronic devices such as mobile phones (see, for example, Patent Document 1 and Patent Document 2).

この技術による多層フレキシブルプリント配線板は、NCドリルや金型等で配線板に穴明けした後にスルーホールめっきを施してから基板両面の回路形成を行う、いわゆる基板両面のスルーホール接続が主流である。しかしながら、電子機器の小型化及び高機能化に伴い、より高密度に基板への部品実装を行うため、部品実装用のスルーホールに対して電子部品の端子を挿し込んで実装する形態から、電子部品を直接基板上に実装する表面実装が行われるようになってきた。そのため、表面部品実装用のスルーホールが部品実装ランド上に存在すると、半田が反対側の基板面へ流れてしまい、正常に部品実装を行うことができない場合がある。   Multi-layer flexible printed wiring boards based on this technology are mainly used for so-called through-hole connection on both sides of the board, in which a circuit is formed on both sides of the board after the through-hole plating is performed after drilling the wiring board with an NC drill or a mold. . However, in order to mount components on a board with higher density as electronic devices become smaller and more functional, the electronic component terminals are inserted into the through holes for component mounting and mounted. Surface mounting in which components are directly mounted on a substrate has been performed. For this reason, if a through hole for mounting a surface component exists on the component mounting land, the solder flows to the opposite substrate surface, and the component mounting may not be performed normally.

そこで、レーザ、プラズマ、または樹脂エッチング等の手法によって微細な有底のビアホールを形成し、そこにめっき処理を施すことにより、該ビアホールが部品実装ランド上に存在しても、電子部品を実装可能なブラインドビアホール接続を行う手法が、携帯電話の液晶廻りを中心として、小型化が進んでいる携帯機器向け用の基板などに使用されている。   Therefore, it is possible to mount electronic components even if the via holes exist on the component mounting land by forming a minute bottomed via hole by a technique such as laser, plasma, or resin etching, and plating it there. A technique for performing blind via-hole connection is used for substrates for mobile devices that are becoming smaller in size, mainly around the liquid crystal of mobile phones.

しかしながら、この手法では基板の両面にめっき処理を施すため、ビアホールの非開口面側においても導体の厚みが増加してしまうので、その後のフォトファブリケーション手法(露光処理によるエッチング手法)によるエッチング加工で形成される回路パターンの微細化が困難となる。   However, in this method, since both sides of the substrate are plated, the thickness of the conductor also increases on the non-opening surface side of the via hole. Therefore, in the subsequent photofabrication method (etching method by exposure processing) It becomes difficult to miniaturize the circuit pattern to be formed.

そこで、このような不具合を解決するために、前述のスルーホールやブラインドビアホール接続による多層フレキシブルプリント配線板にめっき処理を施す場合に、ラック型基板保持具を用いてめっき処理を行う技術が開示されている(例えば、特許文献3、特許文献4参照)。すなわち、この技術によれば、ラック型基板保持具には、基板の面内でのめっき厚を均一化するための遮蔽板が、枠体の両面において上下左右の周辺部に設けられている。   Therefore, in order to solve such a problem, a technique of performing a plating process using a rack-type substrate holder when the above-described multilayer flexible printed wiring board with through-hole or blind via-hole connection is plated is disclosed. (For example, refer to Patent Document 3 and Patent Document 4). That is, according to this technique, the rack-type substrate holder is provided with shielding plates for uniformizing the plating thickness in the plane of the substrate on the upper, lower, left and right peripheral portions on both sides of the frame.

また、ラック型基板保持具の個体差によるめっき厚のばらつきの影響を回避するために、ラック型基板保持具を使用する代わりに、ハンガー型基板保持具を使用する技術も開示されている(例えば、特許文献5参照)。この技術によれば、めっき厚のばらつきの影響を回避するために、ラック型基板保持具を使用せずに、陰極バーに横移動自在に支持されたハンガー型基板保持具に、めっき処理される回路基材の上部を懸垂状態に挟持して複数の回路基材を隣接させている。そして、複数の回路基材を隣接させた状態で、陰極バーか
らハンガー型基板保持具を介して製品上部で給電しながら、陰極バーに沿ってめっき処理槽内のめっき液中を横向きで水平に進行させながら電解めっき処理を施す、いわゆるラックレス方式のめっき装置を用いている。
Also, a technique of using a hanger type substrate holder instead of using a rack type substrate holder in order to avoid the influence of variation in plating thickness due to individual differences of the rack type substrate holder is disclosed (for example, , See Patent Document 5). According to this technique, in order to avoid the influence of variation in plating thickness, plating is performed on a hanger-type substrate holder supported so as to be laterally movable on the cathode bar without using a rack-type substrate holder. A plurality of circuit substrates are adjacent to each other with the upper portion of the circuit substrate held in a suspended state. Then, while supplying power from the cathode bar to the upper part of the product via the hanger-type substrate holder with a plurality of circuit bases adjacent to each other, horizontally in the plating solution in the plating tank along the cathode bar. A so-called rackless type plating apparatus is used which performs electrolytic plating while being advanced.

しかし、これらのめっき装置を用いて、基板の片面のみにめっき処理を施すためには、非めっき面に対してめっきマスクを用いる必要がある。そのため、マスキングを行うためのめっきマスク形成工程、及びマスクを剥離するための剥離工程がさらに必要となるため、めっき処理工数の増加や製品歩留まりの低下の原因となっている。   However, in order to perform plating on only one surface of the substrate using these plating apparatuses, it is necessary to use a plating mask for the non-plated surface. Therefore, a plating mask forming step for masking and a peeling step for peeling the mask are further required, which causes an increase in the number of plating processes and a decrease in product yield.

また、両面フレキシブルプリント配線板のビアホール開口面のみにめっき処理を施す手法の一例として、2枚の両面銅貼積層板を両面微粘着フィルム等でビアホール開口面を外向きにして貼り合せ、導通用孔を形成してそのままビアホールめっきを行い、その後、微粘着フィルムを剥離することで、ビアホール開口面側のみにめっき被膜を形成した両面フレキシブルプリント配線板を製造する方法が開示されている(例えば、特許文献6参照)。   In addition, as an example of a method for plating only the via hole opening surface of the double-sided flexible printed circuit board, two double-sided copper-clad laminates are bonded with a double-sided slightly adhesive film or the like with the via hole opening surface facing outward, for conduction A method for producing a double-sided flexible printed wiring board in which a plating film is formed only on the via hole opening side is disclosed by forming a hole and performing via hole plating as it is, and then peeling off the slightly adhesive film (for example, (See Patent Document 6).

この技術によれば、2枚の両面フレキシブルプリント配線板のビアホールめっきを一括して行えるメリットはあるものの、微粘着フィルムによる貼り合せ及びその剥離工程等が煩雑なものとなる。特に、多層フレキシブルプリント配線板では、両面フレキシブルプリント配線板のようにロール・トゥ・ロールでめっき処理を行うことが困難である。すなわち、ロール・トゥ・ロールのめっき処理であれば、微粘着フィルムの貼り合せ及びその剥離工程等を連続して行うことも可能であるが、短尺のシート毎に貼り合せ及び剥離を行うと加工コストが高くなるおそれがある。   According to this technique, although there is a merit that via hole plating of two double-sided flexible printed wiring boards can be performed in a lump, bonding with a slightly adhesive film, a peeling process thereof, and the like become complicated. In particular, in a multilayer flexible printed wiring board, it is difficult to perform a plating process by roll-to-roll like a double-sided flexible printed wiring board. That is, if it is a roll-to-roll plating process, it is possible to continuously perform the bonding of the slightly adhesive film and its peeling step, etc., but if the bonding and peeling are performed for each short sheet, it is processed. Cost may increase.

また、熱発泡フィルムを用いた場合においても、その熱発泡フィルムを剥離した後のフィルム残渣物の処理を行う必要である。そのため、これらの副資材のコストが高くなってしまうおそれがある。また、これらの微粘着フィルムや熱発泡フィルムによるめっき浴の汚染や糊残りに起因するエッチング不良や端子めっき不良等の品質低下も懸念される。   In addition, even when a thermally foamed film is used, it is necessary to treat the film residue after peeling the thermally foamed film. Therefore, there is a possibility that the cost of these auxiliary materials will increase. In addition, there is a concern about quality deterioration such as defective etching and terminal plating due to contamination of the plating bath and adhesive residue due to these slightly adhesive films and thermally foamed films.

そこで、これらの不具合を解決するために、2枚の回路基材の裏面を平行に対向させた状態で電解めっき処理を行う手法が開示されている(例えば、特許文献7参照)。この技術によれば、各回路基材の裏面側は遮蔽板によって電界が遮蔽されるためにめっき処理が施されないが、各回路基材の表面側には所望の厚みのめっき処理を施すことができる。しかしながら、陽極間の中央部に基板保持具を設置しないためにめっき装置の個体差等によって陽極と回路基材との間の距離差が存在するような場合において、浴抵抗の相違によって電解めっき厚に差が発生し、その後のフォトファブリケーション手法によるエッチング加工で形成される回路パターンの微細化を行うことが困難となる。   Therefore, in order to solve these problems, a technique is disclosed in which electrolytic plating is performed with the back surfaces of two circuit substrates facing each other in parallel (see, for example, Patent Document 7). According to this technique, the back surface side of each circuit base material is not subjected to plating because the electric field is shielded by the shielding plate, but the surface side of each circuit base material can be plated with a desired thickness. it can. However, in the case where there is a distance difference between the anode and the circuit base material due to individual differences of the plating apparatus because the substrate holder is not installed at the center between the anodes, the electrolytic plating thickness Therefore, it becomes difficult to miniaturize a circuit pattern formed by subsequent etching using a photofabrication technique.

特許第3776304号公報Japanese Patent No. 3776304 特許第4236837号公報Japanese Patent No. 4236837 特開2006−291337号公報JP 2006-291337 A 特開2008−138257号公報JP 2008-138257 A 特開2006−316322号公報JP 2006-316322 A 特開2006−086358号公報JP 2006-086358 A 特開平11−229196号公報Japanese Patent Laid-Open No. 11-229196

以上に述べたような事情により、さらに簡便でめっき浴の汚染がなく、多層プリント配線板のビアホールの開口面のみに均一なめっき厚でめっき処理を施すことができる多層プリント配線板の製造方法の実現が望まれている。   Due to the circumstances as described above, a multilayer printed wiring board manufacturing method capable of performing plating treatment with a uniform plating thickness only on the opening surface of the via hole of the multilayer printed wiring board is further simple and free from contamination of the plating bath. Realization is desired.

そこで、簡便な手法であって副資材を用いることなく、且つめっき浴の汚染がなく、片面のビアホール開口面のみにめっき被膜を形成することができる多層プリント配線板を安価且つ安定的に製造することができる多層プリント配線板の製造方法、及びその多層プリント配線板の製造に用いられる基板保持具、並びに遮蔽板を提供するために解決すべき技術的課題が生じてくるのであり、本発明はこの課題を解決することを目的とする。   Thus, a multilayer printed wiring board that is a simple method, does not use secondary materials, is free from contamination of the plating bath, and can form a plating film only on one side of the via hole opening surface, is inexpensively and stably manufactured. A technical problem to be solved in order to provide a manufacturing method of a multilayer printed wiring board that can be used, a substrate holder used for manufacturing the multilayer printed wiring board, and a shielding plate arises. It aims at solving this subject.

本発明は上記目的を達成するために提案されたものであり、請求項1記載の発明は、
多層プリント配線板の製造方法において、3層以上の導電層と前記各導電層間に介在された絶縁層とを有する回路基材を作成する第1の工程と、前記回路基材の一方面の最外層の導電層から他方面の最外層の導電層に至る経路において、前記一方面のみに開口部を有する非貫通の導通用孔を形成する第2の工程と、前記導通用孔の内壁に対して導電化処理を行う第3の工程と、前記回路基材の片面を覆う面積を有し、且つ、該回路基材より下方に延長する長さを有する遮蔽板を備えた基板保持具を用意する第4の工程と、前記開口部を有する前記一方面と反対の面側を前記遮蔽板に向けて、前記回路基材を前記基板保持具に取り付ける第5の工程と、前記基板保持具に取り付けられた前記回路基材をめっき液に浸漬させ、電解めっき処理を行って片側のみに開口部を有するビアホールを形成する第6の工程とを含むことを特徴とする多層プリント配線板の製造方法を提供する。
The present invention has been proposed to achieve the above object, and the invention according to claim 1
In the method for manufacturing a multilayer printed wiring board, a first step of creating a circuit base material having three or more conductive layers and an insulating layer interposed between the conductive layers, and an outermost surface of one side of the circuit base material A second step of forming a non-penetrating conduction hole having an opening only on the one side in a path from the outer conductive layer to the outermost conductive layer on the other side, and an inner wall of the conduction hole Preparing a substrate holder having a third step of conducting the conductive treatment and a shielding plate having an area covering one surface of the circuit base material and extending downward from the circuit base material A fourth step of attaching the circuit base material to the substrate holder with the surface opposite to the one surface having the opening facing the shielding plate, and the substrate holder The mounted circuit board is immersed in a plating solution and subjected to electrolytic plating. Te provides a method for manufacturing a multilayer printed wiring board which comprises a sixth step of forming a via hole having an opening only on one side.

この方法によれば、簡便で副資材を用いず、めっき浴の汚染もなく、片側のビアホール開口面のみにめっき被膜が形成された多層プリント配線板を安価に安定的に製造することができる。さらに、回路基材と遮蔽板との間隔が好ましくは15mm以下とすることで、導通用孔開口とは反対の面側への電流の回り込みによるめっき析出を抑制するのに好適である。また、回路基材と遮蔽板との間隙を5mm以上とすることで、特に多層フレキシブルプリント配線板などの、薄物の回路基材をめっき処理する場合であっても、回路基材が撓んで遮蔽板と接触することにより、めっき液の持ち出しが多くなったり、水洗等が困難になることを抑止することができる。   According to this method, a multilayer printed wiring board in which a plating film is formed only on the via hole opening surface on one side can be stably and inexpensively manufactured without using a secondary material and without contamination of the plating bath. Furthermore, by setting the distance between the circuit substrate and the shielding plate to be preferably 15 mm or less, it is suitable for suppressing plating deposition due to current sneaking to the surface opposite to the opening for conduction. In addition, by setting the gap between the circuit substrate and the shielding plate to be 5 mm or more, the circuit substrate is bent and shielded even when a thin circuit substrate such as a multilayer flexible printed wiring board is plated. By coming into contact with the plate, it is possible to prevent the plating solution from being taken out more frequently or difficult to be washed with water.

請求項2記載の発明は、多層プリント配線板の製造方法において、3層以上の導電層と前記各導電層間に介在された絶縁層とを有する回路基材を作成する第1の工程と、前記回路基材の一方面の最外層の導電層から他方面の最外層の導電層に至る経路において、前記一方面のみに開口部を有する非貫通の導通用孔を形成する第2の工程と、前記導通用孔の内壁に対して導電化処理を行う第3の工程と、前記回路基材へ給電する給電用端子を備えた一対の縦枠を上側横枠及び下側横枠で間隔を保持して固定した枠体を有し、且つ、前記一対の縦枠間に前記回路基材を上端で受ける上端基材受け及び下端で受ける下端基材受けを有し、左右の前記一対の縦枠に接すると共に前記上端基材受けから前記下端基材受けより下方まで延長する長さを有する遮蔽板を設けたラック型基板保持具を用意する第4の工程と、前記開口部を有する前記一方面と反対の面側を前記遮蔽板に向けて、前記回路基材の両横端部を前記ラック型基板保持具の前記給電用端子に接するように取り付ける第5の工程と、前記ラック型基板保持具に取り付けられた前記回路基材をめっき液に浸漬させ、電解めっき処理を行って、片側のみに開口を有するビアホールを形成する第6の工程とを含むことを特徴とする多層プリント配線板の製造方法を提供する。   The invention according to claim 2 is a method for producing a multilayer printed wiring board, the first step of creating a circuit substrate having three or more conductive layers and an insulating layer interposed between the conductive layers, A second step of forming a non-penetrating conduction hole having an opening only on the one surface in a path from the outermost conductive layer on one surface of the circuit substrate to the outermost conductive layer on the other surface; A third step of conducting a conductive treatment on the inner wall of the hole for conduction and a pair of vertical frames provided with power supply terminals for supplying power to the circuit substrate are maintained at an interval between the upper horizontal frame and the lower horizontal frame. A pair of left and right vertical frames having an upper end base receiving at the upper end and a lower end receiving at the lower end between the pair of vertical frames. And has a length extending from the upper end base receiver to below the lower end base receiver. A fourth step of preparing a rack-type substrate holder provided with a shielding plate; and a side opposite to the one surface having the opening is directed to the shielding plate, and both lateral ends of the circuit base are A fifth step of attaching the rack-type substrate holder so as to be in contact with the power feeding terminal; immersing the circuit base material attached to the rack-type substrate holder in a plating solution; And a sixth step of forming a via hole having an opening only on one side. A method for manufacturing a multilayer printed wiring board is provided.

この方法によれば、さらに、回路基材をラック型基板保持具に取り付けてめっき処理を行う場合、回路基材との間隔が好ましくは15mm以下で両横端部はラック型基板保持具に接するように、非貫通の導通用孔の開口部とは反対の面側に遮蔽板を設置することで、
両横端部のめっき析出を抑制することができる。また、回路基材と遮蔽板との間隙を5mm以上とすることで、特に多層フレキシブルプリント配線板などの、薄物の回路基材をめっき処理する場合であっても、回路基材が撓んで遮蔽板と接触することにより、めっき液の持ち出しが多くなったり、水洗等が困難になることを抑止することができる。
According to this method, when the circuit substrate is attached to the rack-type substrate holder and plating is performed, the distance from the circuit substrate is preferably 15 mm or less, and both lateral ends are in contact with the rack-type substrate holder. Thus, by installing a shielding plate on the surface opposite to the opening of the non-penetrating conduction hole,
Plating deposition at both lateral ends can be suppressed. In addition, by setting the gap between the circuit substrate and the shielding plate to be 5 mm or more, the circuit substrate is bent and shielded even when a thin circuit substrate such as a multilayer flexible printed wiring board is plated. By coming into contact with the plate, it is possible to prevent the plating solution from being taken out more frequently or difficult to be washed with water.

請求項3記載の発明は、多層プリント配線板の製造方法において、3層以上の導電層と前記各導電層間に介在された絶縁層とを有する回路基材を作成する第1の工程と、前記回路基材の一方面のみに開口部を有し、前記一方面の最外層の導電層から他方面の最外層の導電層に至る経路において、前記一方面のみに開口を有する非貫通の導通用孔を形成する第2の工程と、前記導通用孔内壁に対して導電化処理を行う第3の工程と、陰極バーに横移動自在に支持され、前記回路基材と同等幅を有するとともに前記回路基材の上端から下端よりも下方まで延長する長さを持つ遮蔽板が懸架されたハンガー型の基板保持具の給電を行うクリップに、前記回路基材を垂下係止して取り付ける第4の工程と、前記回路基材をめっき液に浸漬させ、他のハンガー型基板保持具と隣接した状態で電解めっき処理を行い、片側のみに開口を有するビアホールを形成する第5の工程とを含むことを特徴とする多層プリント配線板の製造方法を提供する。   The invention according to claim 3 is a method for producing a multilayer printed wiring board, the first step of creating a circuit substrate having three or more conductive layers and an insulating layer interposed between the conductive layers, For non-penetrating conduction having an opening only on one side of the circuit substrate and having an opening only on the one side in the path from the outermost conductive layer on the one side to the outermost conductive layer on the other side A second step of forming a hole; a third step of conducting a conductive treatment on the inner wall of the hole for conduction; and a cathode bar supported so as to be laterally movable, and having the same width as the circuit substrate, and A circuit board is fixedly attached to a clip for supplying power to a hanger-type substrate holder in which a shielding plate having a length extending from the upper end to the lower end of the circuit base is suspended. A step of immersing the circuit substrate in a plating solution, Performs electrolytic plating process in a state adjacent to the guard-type substrate holder, to provide a method of manufacturing a multilayer printed wiring board characterized in that it comprises a fifth step of forming a via hole having an opening only on one side.

この方法によれば、さらに、回路基材を遮蔽板に組み付けたハンガー型基板保持具に取り付けてめっき処理を行う場合には、非貫通の導通用孔の開口と反対の面側には、回路基材と遮蔽板との間隔が好ましくは15mm以下とし、電解めっき時に両隣との間隔がないよう各基板保持具の遮蔽板同士を隣接させることで、両横端部のめっき析出を抑制することができる。また、回路基材と遮蔽板との間隙を5mm以上とすることで、特に、多層フレキシブルプリント配線板などの、薄物の回路基材をめっき処理する場合であっても、回路基材が撓んで遮蔽板と接触することにより、めっき液の持ち出しが多くなったり、水洗等が困難になることを抑止することができる。   According to this method, when the plating is performed by attaching the circuit base material to the hanger type substrate holder assembled to the shielding plate, the circuit side is opposite to the opening of the non-penetrating conduction hole. The distance between the base material and the shielding plate is preferably 15 mm or less, and the shielding plates of the respective substrate holders are adjacent to each other so that there is no gap between both sides at the time of electrolytic plating, thereby suppressing plating deposition at both lateral ends. Can do. In addition, by setting the gap between the circuit substrate and the shielding plate to 5 mm or more, the circuit substrate is bent even when a thin circuit substrate such as a multilayer flexible printed wiring board is plated. By coming into contact with the shielding plate, it is possible to prevent the plating solution from being taken out more frequently or difficult to be washed with water.

請求項4記載の発明は、多層プリント配線板の製造に用いられるラック型基板保持具であって、回路基材への給電用端子を備えた一対の縦枠を上側及び下側の横枠で間隔を保持して固定した枠体を有し、且つ、前記一対の縦枠間に前記回路基材を上端で受ける上端基材受け及び下端で受ける下端基材受けを有し、左右の前記一対の縦枠に接すると共に前記上端基材受けから前記下端基材受けより下方まで延長する長さを有する遮蔽板を設けることを特徴とするラック型基板保持具を提供する。   The invention according to claim 4 is a rack-type board holder used in the manufacture of a multilayer printed wiring board, wherein a pair of vertical frames provided with terminals for feeding power to a circuit substrate is divided into upper and lower horizontal frames. A pair of left and right left and right pairs having a frame body fixed at an interval, and having an upper end substrate receiver for receiving the circuit substrate at an upper end and a lower end substrate receiver for receiving at a lower end between the pair of vertical frames. A rack-type substrate holder is provided, characterized in that a shielding plate is provided which is in contact with the vertical frame and has a length extending from the upper end base receiver to a position below the lower end base receiver.

この構成によれば、ラック型基板保持具を用いる場合、遮蔽板をその上端基材受けと接するように加工し、その下端部より下方に30mm以上、好ましくは60mm以上延長し、下端基材受けにも補助遮蔽板を設けるが望ましい。また、非貫通の導通用孔開口と反対の面側に設置したラック型基板保持具を電解めっき時に用いることで、下端部のめっき析出を抑制できる。但し、遮蔽板の下端部をあまり長くしても、遮蔽効果がさほど上がらなくなるので、下側横枠との干渉やめっき液の持ち出し量が増えるといったデメリットを勘案すると、遮蔽板の延長は120mm以下とするのが妥当である。   According to this configuration, when the rack-type substrate holder is used, the shielding plate is processed so as to be in contact with the upper end base member, and is extended below the lower end by 30 mm or more, preferably 60 mm or more. It is also desirable to provide an auxiliary shielding plate. Further, by using a rack-type substrate holder installed on the side opposite to the non-through hole opening for conduction during electroplating, plating deposition at the lower end can be suppressed. However, even if the lower end of the shielding plate is made too long, the shielding effect will not be improved so much. Considering the demerits such as interference with the lower horizontal frame and the amount of plating solution taken out, the extension of the shielding plate is 120 mm or less. Is reasonable.

請求項5記載の発明は、陰極バーに横移動自在に懸架され、回路基材を垂下係止すると共に給電を行うハンガー型基板保持具に取り付ける遮蔽板であって、前記ハンガー型基板保持具の肩部に取り付ける把持部と、前記回路基材の上端を保持すると共に遮蔽する張出部とを備え、前記回路基材と同等幅を有し、且つ、前記回路基材の上端から下端よりも下方まで延長する長さを有することを特徴とする遮蔽板を提供する。   The invention according to claim 5 is a shielding plate that is suspended on the cathode bar so as to be laterally movable, and is attached to a hanger-type substrate holder that suspends and locks the circuit base material and supplies power. A gripping part to be attached to a shoulder part, and an overhanging part that holds and shields the upper end of the circuit base material, has the same width as the circuit base material, and is more than the lower end from the upper end of the circuit base material A shielding plate having a length extending downward is provided.

この構成によれば、ラックレス型のめっき装置を使用する場合には、陰極バーに懸架されているハンガー型基板保持具に、上端部基材受けを設けた遮蔽板を固定する。回路基材は上端部基材受と接するように基板保持具に取り付ける。そして、遮蔽板を回路基材の下
端部より下方に30mm以上、好ましくは60mm以上延長し、遮蔽板の下端部にも補助遮蔽板を設置したものを、電解めっき時に用いることで、下端部のめっき析出を抑制できる。但し、遮蔽板の下端部をあまり長くしても、遮蔽効果がさほど上がらなくなるので、重量の増加やめっき液の持ち出し量が増えるといったデメリットを勘案すると、遮蔽板の延長は120mm以下とするのが妥当である
According to this configuration, when a rackless type plating apparatus is used, the shielding plate provided with the upper end base material holder is fixed to the hanger type substrate holder suspended on the cathode bar. The circuit base is attached to the substrate holder so as to contact the upper end base. And by extending the shielding plate below the lower end of the circuit substrate by 30 mm or more, preferably 60 mm or more, and using the auxiliary shielding plate installed at the lower end of the shielding plate at the time of electrolytic plating, Plating precipitation can be suppressed. However, even if the lower end of the shielding plate is made too long, the shielding effect will not increase so much. Considering the demerits such as an increase in weight and the amount of plating solution taken out, the extension of the shielding plate should be 120 mm or less. Is reasonable

請求項1記載の発明によれば、簡便で副資材を用いず、めっき浴の汚染なく、片側のビアホール開口面のみにめっき被膜が形成された多層プリント配線板を安価且つ安定的に製造することができる。また、煩雑なレジスト形成等の工程を行うことなく、生産性よく、片面めっきを行うことができる。   According to the first aspect of the present invention, a multilayer printed wiring board in which a plating film is formed only on one side of the via-hole opening surface without using a secondary material, without contamination of the plating bath, and stably is manufactured inexpensively. Can do. In addition, single-side plating can be performed with high productivity without performing complicated steps such as resist formation.

請求項2記載の発明によれば、回路基材をラック型基板保持具に取り付けてめっき処理を行う場合、回路基材との間隔を適正にして、両横端部は基板保持具に接するように非貫通の導通用孔開口と反対の面側に遮蔽板を設置することで、両横端部のめっき析出を抑制することができる。また、剥離後のフィルム残渣物の処理の必要もなく、これら副資材コストも必要がない。加えて、これらの微粘着フィルムや熱発泡フィルムによるめっき浴の汚染も全く懸念する必要がない。   According to the second aspect of the present invention, when the circuit base is attached to the rack-type substrate holder and the plating process is performed, the distance between the circuit base and the circuit base is made appropriate so that both lateral ends are in contact with the substrate holder. By installing a shielding plate on the side opposite to the non-through hole opening for conduction, plating deposition at both lateral ends can be suppressed. In addition, there is no need to treat the film residue after peeling, and there is no need for these secondary material costs. In addition, there is no need to worry at all about the contamination of the plating bath by these slightly adhesive films and thermally foamed films.

請求項3記載の発明によれば、回路基材を遮蔽板に組み付けたハンガー型基板保持具に取り付けてめっき処理を行う場合には、非貫通の導通用孔開口と反対の面側には、回路基材と遮蔽板との間隔が適性に保たれているので、電解めっき時に両隣との間隔がないよう各基板保持具の遮蔽板同士を隣接させることで、両横端部のめっき析出を抑制することができる。さらに、めっき装置の個体差により陽極と回路材間の距離差が存在する場合でも、電解めっき厚の差は発生せず、その後のフォトファブリケーション手法によるエッチング加工で形成される回路パターンの微細化が容易である。これらのことから、片側のみにビアホールの開口を有するブラインドビアホール接続による多層プリント配線板を安価に安定的に製造することができる。   According to the invention described in claim 3, when the plating is performed by attaching the circuit base material to the hanger-type substrate holder assembled to the shielding plate, the surface side opposite to the non-penetrating conduction hole opening is Since the distance between the circuit board and the shielding plate is kept at an appropriate level, by plating the shielding plates of each substrate holder adjacent to each other so that there is no gap between both sides during electrolytic plating, Can be suppressed. Furthermore, even if there is a difference in the distance between the anode and the circuit material due to individual differences in the plating equipment, there is no difference in the thickness of the electrolytic plating, and the circuit pattern formed by the subsequent etching process using photofabrication techniques is miniaturized. Is easy. Therefore, a multilayer printed wiring board by blind via hole connection having a via hole opening only on one side can be stably manufactured at low cost.

請求項4記載の発明によれば、ラック型基板保持具を用いる場合、非貫通の導通用孔の開口と反対の面側に設置した基板保持具を電解めっき時に用いることで、下端部のめっき析出を抑制することができる。従って、多層プリント配線板の製造に適したラック型基板保持具を提供することができる。   According to invention of Claim 4, when using a rack-type board | substrate holder, the board | substrate holder installed in the surface side opposite to the opening of the non-through | permeability hole is used at the time of electroplating, and plating of a lower end part is carried out. Precipitation can be suppressed. Therefore, it is possible to provide a rack-type substrate holder suitable for manufacturing a multilayer printed wiring board.

請求項5記載の発明によれば、ラックレス型のめっき装置を使用する場合には、陰極バーに懸架されているハンガー型基板保持具に、上端部基材受けを設けた適正な大きさの遮蔽板を固定することができる。これによって、多層プリント配線板の製造に適したラック型基板保持具並びにハンガー型基板保持具に組み付ける遮蔽板を提供することができる。   According to the fifth aspect of the present invention, when a rackless type plating apparatus is used, the hanger-type substrate holder suspended on the cathode bar is provided with an upper end base receiving member of an appropriate size. The shielding plate can be fixed. Accordingly, it is possible to provide a rack-type substrate holder suitable for manufacturing a multilayer printed wiring board and a shielding plate to be assembled to the hanger-type substrate holder.

本発明に係る共通の実施例として、3層構成の多層フレキシブルプリント配線板の製造工程を示す基板端面図。The board | substrate end view which shows the manufacturing process of the multilayer flexible printed wiring board of a 3 layer structure as a common Example which concerns on this invention. 本発明の実施例に係る基板保持具に3層の回路基材を取り付けた状態を示す端面構成図。The end surface block diagram which shows the state which attached the circuit base material of 3 layers to the board | substrate holder which concerns on the Example of this invention. 本発明に係る実施例1のラック型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)A−A‘は端面図。BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the rack-type board | substrate holder of Example 1 which concerns on this invention, (a) is a front view, (b) is a bottom view, (c) A-A 'is an end elevation. 本発明に係る実施例2のラック型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)はA−A‘端面図。It is a block diagram of the rack-type board | substrate holder of Example 2 which concerns on this invention, (a) is a front view, (b) is a bottom view, (c) is A-A 'end elevation. 本発明に係る実施例3のラック型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)はA−A‘端面図、(d)は部分拡大図。It is a block diagram of the rack-type board | substrate holder of Example 3 which concerns on this invention, (a) is a front view, (b) is a bottom view, (c) is an AA 'end elevation, (d) is a partial expansion. Figure. 本発明に係る実施例4のハンガー型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)はA−A‘端面図、(d)はB−B’端面図。It is a block diagram of the hanger type | mold board | substrate holder of Example 4 which concerns on this invention, (a) is a front view, (b) is a bottom view, (c) is an AA 'end elevation, (d) is B- B 'end view. 本発明に係る実施例5のハンガー型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)はA−A‘端面図、(d)はB−B’端面図。It is a block diagram of the hanger type | mold board | substrate holder of Example 5 which concerns on this invention, (a) is a front view, (b) is a bottom view, (c) is an AA 'end elevation, (d) is B- B 'end view. 本発明に係る実施例6のハンガー型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)はA−A‘端面図、(d)はB−B’端面図、(e)は部分拡大図。It is a block diagram of the hanger type | mold board | substrate holder of Example 6 which concerns on this invention, (a) is a front view, (b) is a bottom view, (c) is an AA 'end elevation, (d) is B- B 'end view, (e) is a partially enlarged view. 本発明に係る実施例7のハンガー型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)はA−A‘端面図、(d)はB−B’端面図。It is a block diagram of the hanger type | mold board | substrate holder of Example 7 which concerns on this invention, (a) is a front view, (b) is a bottom view, (c) is an AA 'end elevation, (d) is B- B 'end view.

本発明は、簡便な手法であって副資材を用いることなく、且つめっき浴の汚染がなく、片面のビアホール開口面のみにめっき被膜を形成することができる多層プリント配線板を安価且つ安定的に製造することができる多層プリント配線板の製造方法を実現するという目的を達成するために、多層プリント配線板の製造方法において、3層以上の導電層と前記各導電層間に介在された絶縁層とを有する回路基材を作成する第1の工程と、前記回路基材の一方面の最外層の導電層から他方面の最外層の導電層に至る経路において、前記一方面のみに開口部を有する非貫通の導通用孔を形成する第2の工程と、前記導通用孔の内壁に対して導電化処理を行う第3の工程と、前記回路基材の片面を覆う面積を有し、且つ、該回路基材より下方に延長する長さを有する遮蔽板を備えた基板保持具を用意する第4の工程と、前記開口部を有する前記一方面と反対の面側を前記遮蔽板に向けて、前記回路基材を前記基板保持具に取り付ける第5の工程と、前記基板保持具に取り付けられた前記回路基材をめっき液に浸漬させ、電解めっき処理を行って片側のみに開口部を有するビアホールを形成する第6の工程とを含むことを特徴とする多層プリント配線板の製造方法を提供することによって実現した。   The present invention provides a simple and inexpensive multilayer printed wiring board that can form a plating film only on the opening surface of a via hole on one side without using a secondary material and without contamination of the plating bath. In order to achieve the purpose of realizing a method for manufacturing a multilayer printed wiring board that can be manufactured, in the method for manufacturing a multilayer printed wiring board, three or more conductive layers and an insulating layer interposed between the conductive layers, And a path from the outermost conductive layer on one side of the circuit base to the outermost conductive layer on the other side of the circuit base has an opening only on the one side. A second step of forming a non-penetrating conduction hole, a third step of conducting a conductive treatment on the inner wall of the conduction hole, an area covering one side of the circuit substrate, and Extend downward from the circuit board A fourth step of preparing a substrate holder having a shielding plate having a length; and holding the circuit substrate with the substrate facing the shielding plate with a surface opposite to the one surface having the opening. A fifth step of attaching to the tool, and a sixth step of immersing the circuit base material attached to the substrate holder in a plating solution and performing an electrolytic plating process to form a via hole having an opening only on one side; It was realized by providing a method for manufacturing a multilayer printed wiring board characterized by comprising:

以下、本発明の好適な実施例の幾つかを図1乃至図9に従って詳細に説明する。尚、各実施例において、共通の内容については先に述べた実施例において説明し、以降の実施例においては重複する説明は省略する。   Hereinafter, some preferred embodiments of the present invention will be described in detail with reference to FIGS. In each of the embodiments, the common contents will be described in the above-described embodiments, and redundant description will be omitted in the following embodiments.

図1は、本発明に係る共通の実施例として、3層構成の多層フレキシブルプリント配線板の製造工程を示す基板端面図である。先ず、同図(a)に示す様に、ポリイミド等の可撓性絶縁ベース材1(ここでは、厚さ25μmのポリイミド)の両面に厚さ12μmの銅箔2及び銅箔3を形成した両面銅張積層板4に対して、両面の回路パターン等をフォトファブリケーション手法により形成するためのレジスト層の形成、露光、現像、エッチング、レジスト層剥離等の一連の工程を行う。そして、該両面銅張積層板4の銅箔2及び銅箔3にレーザ加工の際のコンフォーマルマスク2a、3aを形成すると共に、銅箔3に対して内層回路パターン3bを形成する。   FIG. 1 is a substrate end view showing a manufacturing process of a multilayer flexible printed wiring board having a three-layer structure as a common embodiment according to the present invention. First, as shown in FIG. 1A, both surfaces of a 12 μm thick copper foil 2 and a copper foil 3 formed on both surfaces of a flexible insulating base material 1 such as polyimide (here, a polyimide having a thickness of 25 μm). The copper clad laminate 4 is subjected to a series of steps such as formation of a resist layer, exposure, development, etching, and resist layer peeling for forming a circuit pattern on both sides by a photofabrication technique. Then, conformal masks 2 a and 3 a at the time of laser processing are formed on the copper foil 2 and the copper foil 3 of the double-sided copper clad laminate 4, and an inner layer circuit pattern 3 b is formed on the copper foil 3.

このときの両面の位置合せは、ベタの基板材料に対して行うため、該基板材料の伸縮等には影響されないため、両面の位置精度は容易に確保することができる。尚、必要に応じて、高精度な両面位置合せが可能な露光機を用いることも可能である。さらに、必要に応じて、接着剤5との密着性を向上させるために表面を粗化する粗化処理を行ってもよい。   Since the alignment of both surfaces at this time is performed with respect to the solid substrate material, it is not affected by the expansion and contraction of the substrate material, so that the positional accuracy of both surfaces can be easily ensured. If necessary, an exposure machine capable of high-precision double-side alignment can be used. Furthermore, you may perform the roughening process which roughens the surface in order to improve adhesiveness with the adhesive agent 5 as needed.

次に、ポリイミド等の可撓性絶縁ベース材6(ここでは厚さ25μmのポリイミド)の片面(ここでは裏面)に厚さ12μmの銅箔7が形成された片面銅張積層板8を用意する。そして、この片面銅張積層板8に対して、可撓性ケーブル部を設けるための開口部位を型抜きし、該型抜きされた片面銅張積層板8と上記の内層回路を形成した両面銅張積層板4を積層するための接着剤5との位置合せを行う。尚、必要に応じて、位置合せ用のガイ
ド等を型抜きした片面銅張積層板8と上記の内層回路を形成した両面銅張積層板4を積層するための接着剤5とを位置合せすることもできる。
Next, a single-sided copper-clad laminate 8 having a 12 μm-thick copper foil 7 formed on one side (here, the backside) of a flexible insulating base material 6 (here, polyimide having a thickness of 25 μm) such as polyimide is prepared. . And the opening part for providing a flexible cable part is die-cut with respect to this single-sided copper clad laminated board 8, and the double-sided copper which formed this die-cut single-sided copper clad laminated board 8 and said inner layer circuit Positioning with the adhesive 5 for laminating the tension laminate 4 is performed. If necessary, the single-sided copper-clad laminate 8 in which alignment guides and the like are cut out and the adhesive 5 for laminating the double-sided copper-clad laminate 4 in which the inner layer circuit is formed are aligned. You can also

次に、同図(b)に示すように、接着剤5を介し、両面銅張積層板4と片面銅張積層板8とを真空プレス等によって積層する。以上の工程において3層構造の回路基材9が形成される。尚、接着剤5としては、ローフロータイプ(流れ難いタイプ)のボンディングシートなどのような流れ出しの少ない接着剤を用いることが好ましい。また、後工程で可撓性ケーブル部の接着剤として機能する必要がない場合は、可撓性は必須の要件とはならないため、接着剤5としてガラスクロスを含むプリプレグ材を使用することもできるが、レーザ加工性等を考慮するとガラスクロスは無い方が好ましい。また、接着剤5の厚さは10〜15μm程度のものを選択することができる。   Next, as shown in FIG. 2B, the double-sided copper-clad laminate 4 and the single-sided copper-clad laminate 8 are laminated by a vacuum press or the like via an adhesive 5. The circuit substrate 9 having a three-layer structure is formed through the above steps. As the adhesive 5, it is preferable to use an adhesive with less flow-out such as a low flow type (hard to flow) bonding sheet. Further, when it is not necessary to function as an adhesive for the flexible cable portion in a later process, since flexibility is not an essential requirement, a prepreg material including a glass cloth can also be used as the adhesive 5. However, considering the laser processability and the like, it is preferable that there is no glass cloth. Further, the adhesive 5 having a thickness of about 10 to 15 μm can be selected.

次に、同図(c)に示すように、コンフォーマルマスク2a及び3aを用いて、レーザ加工を行い、回路基材9の3層の銅箔2、銅箔3、銅箔7を接続するための非貫通の導通用孔10を形成する。尚、導通用孔10を形成するためのレーザ加工用のレーザの種類としては、UV−YAGレーザ、炭酸ガスレーザ、またはエキシマレーザ等を選択することが可能である。   Next, as shown in FIG. 2C, laser processing is performed using the conformal masks 2a and 3a to connect the three layers of the copper foil 2, the copper foil 3, and the copper foil 7 of the circuit substrate 9. A non-penetrating conduction hole 10 is formed. As a type of laser processing laser for forming the conduction hole 10, a UV-YAG laser, a carbon dioxide laser, an excimer laser, or the like can be selected.

次に、同図(d)に示すように、導通用孔10を有する3層の回路基材9に対して導電化処理を行い、10〜20μm程度の電解めっき処理を施して3層の銅箔2、銅箔3、及び銅箔7の層間導通をとる。このとき、開口を有しない面側(すなわち、同図(d)の銅箔7の下面側)にはめっきを付けない、いわゆる片面めっき処理を行う。   Next, as shown in FIG. 4D, the three-layer circuit substrate 9 having the conduction holes 10 is subjected to a conductive treatment, and an electrolytic plating treatment of about 10 to 20 μm is performed to form a three-layer copper. Interlayer conduction of the foil 2, the copper foil 3, and the copper foil 7 is taken. At this time, a so-called single-side plating process is performed in which no plating is applied to the surface side having no opening (that is, the lower surface side of the copper foil 7 in FIG. 4D).

ここで、片面めっき処理の方法について説明する。図2は、本発明の実施例に係る基板保持具に3層の回路基材を取り付けた状態を示す端面構成図である。すなわち、片面めっき処理の方法としては、図2に示すように、導通用孔10を有する回路基材9を基板保持具(図示せず)に固定し、回路基材9との間隔が15mm以下で該回路基材9の片面を覆うように遮蔽板13が設置されている。この遮蔽板13は、回路基材9を電解めっき時の基板保持具(図示せず)に固定した際に、上端が基材受けで固定された回路基材9の開口部(すなわち、導通用孔10)と反対の面(すなわち、回路基材9の裏面側)を覆っている。また、詳細は後述するが、遮蔽板13は回路基材9の下端部より下方に60mm以上延長されている。   Here, the method of the single-side plating process will be described. FIG. 2 is an end face configuration diagram illustrating a state in which a three-layer circuit base is attached to the substrate holder according to the embodiment of the present invention. That is, as a method of the single-side plating treatment, as shown in FIG. 2, the circuit substrate 9 having the conduction holes 10 is fixed to a substrate holder (not shown), and the distance from the circuit substrate 9 is 15 mm or less. The shielding plate 13 is installed so as to cover one side of the circuit substrate 9. The shielding plate 13 has an opening (i.e., a conductive member) whose upper end is fixed by a base material holder when the circuit base material 9 is fixed to a substrate holder (not shown) during electrolytic plating. The surface opposite to the hole 10) (that is, the back surface side of the circuit substrate 9) is covered. Moreover, although mentioned later for details, the shielding board 13 is extended below the lower end part of the circuit base material 9 60 mm or more.

このようにして、下端が基材受けで固定された回路基材9を基板保持具にセットし、めっき槽に浸漬させて電解めっき処理を行うことにより、図1(d)に示すように、導通用孔10の開口面側からのみめっき被膜11を析出させることができる。   In this way, by setting the circuit base material 9 whose lower end is fixed by the base material holder to the substrate holder and immersing it in the plating tank to perform electrolytic plating treatment, as shown in FIG. The plating film 11 can be deposited only from the opening surface side of the hole 10 for conduction.

尚、図2において、回路基材9と遮蔽板13の間隔が5mmより狭いと、回路基材9は可撓性を有することから、回路基材9が遮蔽板13に接触したり、導通用孔10の開口面の反対面の液更新が困難になって十分な水洗処理を行うことができなくなるおそれがある。一方、回路基材9と遮蔽板13の間隔が15mmより広い場合は、上端基材受け部分の遮蔽効果が弱まって導通用孔10の開口面の反対面、特に、回路基材9の上端部に、電解めっき処理時の電流が回り込むことによって、不必要なめっきが析出されるおそれがある。   In FIG. 2, if the distance between the circuit substrate 9 and the shielding plate 13 is narrower than 5 mm, the circuit substrate 9 has flexibility. There is a possibility that it becomes difficult to renew the liquid on the surface opposite to the opening surface of the hole 10 and the sufficient water washing treatment cannot be performed. On the other hand, when the distance between the circuit base material 9 and the shielding plate 13 is wider than 15 mm, the shielding effect of the upper base material receiving portion is weakened, and the surface opposite to the opening surface of the conduction hole 10, particularly the upper end portion of the circuit base material 9. Further, unnecessary current plating may be deposited due to the current flowing during the electrolytic plating process.

再び、図1に戻り、図2に示したような片面めっき処理の手法により、図1(d)に示すように3層の回路基材9の第1層のみにめっき処理が施され、且つ、導通用孔10にはステップビアホール12がめっき処理によって形成される。   Returning to FIG. 1 again, the plating process is performed only on the first layer of the three-layer circuit substrate 9 as shown in FIG. The step via hole 12 is formed in the conduction hole 10 by plating.

次に、図1(e)に示すように、めっき処理が施された第1層の表面(すなわち、銅箔
2の表面)と、めっき処理が施されない第3層の裏面(すなわち、銅箔7の表面)とを、同時に、フォトファブリケーション手法によるエッチング処理によって回路パターン2b及び回路パターン7bを形成する。このとき、ステップビアホール12の開口面である第1層面にはテンティング性(すなわち、エッチングによるレジスト周辺の破損防止)を確保するために、20μm以上の厚さを有するドライフィルムレジストを適用することが好ましい。
Next, as shown in FIG.1 (e), the surface of the 1st layer by which the plating process was performed (namely, surface of copper foil 2), and the back surface of the 3rd layer which is not plated (namely, copper foil) 7), and simultaneously, the circuit pattern 2b and the circuit pattern 7b are formed by etching using a photofabrication technique. At this time, a dry film resist having a thickness of 20 μm or more is applied to the first layer surface that is the opening surface of the step via hole 12 in order to ensure tenting properties (that is, prevention of damage around the resist due to etching). Is preferred.

また、テンティング性の考慮の必要がなく、銅箔7の薄い第3層面には10μm以下の微細パターン形成用のドライフィルムレジストを適用することが可能である。その他、液状レジストを用いる場合等はステップビアホール12のテンティング性を考慮する必要がないため、第1層面と第3層面に形成するレジスト層は同じ厚みでよい。   Further, there is no need to consider tenting properties, and a dry film resist for forming a fine pattern of 10 μm or less can be applied to the thin third layer surface of the copper foil 7. In addition, when a liquid resist is used, it is not necessary to consider the tenting property of the step via hole 12, and therefore the resist layer formed on the first layer surface and the third layer surface may have the same thickness.

次に、第1層面と第3層面にソルダーレジスト層やカバーレイを形成し、必要に応じ所定の開口を設けたペースト・フィルム等のシールド層も形成する。この工程の前後で、必要に応じて基板表面に半田めっき、ニッケルめっき、金めっき等の表面処理を施し、外形加工を行うことで、片側のみに開口を有する有底のステップビアホール接続による3層の多層フレキシブルプリント配線基板を得ることができる。尚、前述の手法によって3層の多層フレキシブルプリント配線基板を作成したところ、第3層面に高密度な配線ピッチ60μmの回路を形成することができた。   Next, a solder resist layer and a cover lay are formed on the first layer surface and the third layer surface, and a shield layer such as a paste film having a predetermined opening is formed if necessary. Before and after this process, if necessary, surface treatment such as solder plating, nickel plating, gold plating, etc. is applied to the surface of the substrate, and external processing is performed, so that three layers with a bottomed step via hole connection having an opening only on one side A multilayer flexible printed wiring board can be obtained. When a three-layer multilayer flexible printed wiring board was prepared by the above-described method, a high-density circuit with a wiring pitch of 60 μm could be formed on the third layer surface.

次に、本発明の多層プリント配線板の製造方法に適用される実施例1のラック型基板保持具の構成について説明する。図3は、本発明に係る実施例1のラック型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)は端面図である。以下、図3の全図を参照しながら実施例1のラック型基板保持具の構成について説明する。   Next, the structure of the rack-type board | substrate holder of Example 1 applied to the manufacturing method of the multilayer printed wiring board of this invention is demonstrated. FIG. 3 is a configuration diagram of the rack-type substrate holder according to the first embodiment of the present invention, in which (a) is a front view, (b) is a bottom view, and (c) is an end view. Hereinafter, the configuration of the rack-type substrate holder according to the first embodiment will be described with reference to all drawings in FIG.

図3において、ラック型基板保持具20は、上部に通電を行うためのフック22を備えた左右一対の縦枠21が、上側の上側横枠23及び下側の下側横枠24で間隔を保持されて、固定した枠体を構成している。その枠体の上下の横枠(すなわち、上側横枠23及び下側横枠24)の内側に上端基材受け25と下端基材受け26が、それぞれ、左右の縦枠21の間に渡されるように設けられている。また、左右一対の枠体21の片面(すなわち、正面図の背面側)には遮蔽板27が上端基材受け25に取り付けられており、該遮蔽板27は、左右の縦枠21に接すると共に、下端基材受け26より下方に延長される長さに構成されている。さらに、下端基材受け26には、補助遮蔽板28が遮蔽板27と平行方向に取り付けられている。   In FIG. 3, the rack-type substrate holder 20 has a pair of left and right vertical frames 21 provided with hooks 22 for energizing the upper part, and an upper upper horizontal frame 23 and a lower lower horizontal frame 24 are spaced apart from each other. It is held and constitutes a fixed frame. An upper end base material receiver 25 and a lower end base material receiver 26 are respectively passed between the left and right vertical frames 21 inside the upper and lower horizontal frames (that is, the upper side horizontal frame 23 and the lower side horizontal frame 24) of the frame. It is provided as follows. In addition, a shielding plate 27 is attached to the upper base support 25 on one side of the pair of left and right frames 21 (that is, the rear side in the front view), and the shielding plate 27 is in contact with the left and right vertical frames 21. The length is extended downward from the lower end substrate receiver 26. Further, an auxiliary shielding plate 28 is attached to the lower end substrate receiver 26 in a direction parallel to the shielding plate 27.

図3についてさらに詳細に説明すると、正面図に示す一対の縦枠21は、それぞれ、下面図に示すように、支柱21a及び基板押さえ板21bとからなる。また、基板押さえ板21bは、支柱21aと蝶番21cとによって開閉自在に取り付けられている。そして、回路基材29が、その支柱21a及び基板押え板21bで挟み込まれる形で取り付けられている。   Referring to FIG. 3 in more detail, each of the pair of vertical frames 21 shown in the front view includes a column 21a and a substrate pressing plate 21b as shown in the bottom view. Moreover, the board | substrate holding | suppressing board 21b is attached so that opening and closing is possible by the support | pillar 21a and the hinge 21c. And the circuit base material 29 is attached in the form inserted | pinched between the support | pillar 21a and the board | substrate holding | suppressing board 21b.

また、特に図示しないが、支柱21a及び基板押え板21bの回路基材29を挟持する部分には、該回路基材29へ給電するための給電用端子が設けられている。その給電用端子の接続端子は、リード線等を介してラック型基板保持具20の上部のフック22に電気的に接続されている。すなわち、該フック22が、めっき装置(図示せず)の上部の陰極バーと接触・導通されることにより、ラック型基板保持具20の給電用端子に給電される。尚、回路基材29の面内でのめっき厚調整を行うために、前記基板押え板21bには同一出願人による特許文献3に記載されるような板状遮蔽物をさらに取り付けてもよい。   Although not particularly illustrated, a power feeding terminal for feeding power to the circuit base material 29 is provided at a portion of the support base 21 a and the board pressing plate 21 b that sandwich the circuit base material 29. The connection terminal of the power feeding terminal is electrically connected to the hook 22 on the upper portion of the rack-type substrate holder 20 via a lead wire or the like. That is, the hook 22 is brought into contact / conduction with the upper cathode bar of the plating apparatus (not shown), thereby supplying power to the power supply terminal of the rack-type substrate holder 20. In order to adjust the plating thickness in the plane of the circuit base material 29, a plate-like shield described in Patent Document 3 by the same applicant may be further attached to the substrate pressing plate 21b.

また、上側の上端基材受け25用の上側横枠23及び下側の下端基材受け26用の下側
横枠24は、それぞれ、左右の縦枠21に取り付けられ、該左右の縦枠21を所定の間隔に保つと共に、回路基材29の上下を支える基材受けの役割を果たしている。
Further, the upper horizontal frame 23 for the upper upper substrate holder 25 and the lower horizontal frame 24 for the lower lower substrate holder 26 are respectively attached to the left and right vertical frames 21. Is maintained at a predetermined interval, and also serves as a base material support for supporting the upper and lower sides of the circuit base material 29.

また、ラック型基板保持具20には、遮蔽板27が回路基材29の片面を覆う位置に設けられている。本実施形態において回路基材29の片面とは、取り付けられる回路基材29の奥側(すなわち、図3の正面図の裏側)である。尚、この遮蔽板27は、回路基材29の表面との距離が5〜15mmとなる位置に設ける。   The rack-type substrate holder 20 is provided with a shielding plate 27 at a position covering one side of the circuit base material 29. In this embodiment, the single side | surface of the circuit base material 29 is the back | inner side (namely, back side of the front view of FIG. 3) of the circuit base material 29 attached. The shielding plate 27 is provided at a position where the distance from the surface of the circuit substrate 29 is 5 to 15 mm.

尚、該遮蔽板27は、下面図に示すように左右が支柱21aと隙間なく接している。また、遮蔽板27の上部と上端基材受け25とはわずかな隙間を設けるが、A−A’端面図に示すように、もし遮蔽板27の上部と上端基材受け25とが隙間なく接する場合には、空気抜きのための通路を上端基材受け25に設ける必要がある。   As shown in the bottom view, the left and right sides of the shielding plate 27 are in contact with the support columns 21a without any gaps. Further, a slight gap is provided between the upper part of the shielding plate 27 and the upper end base material receiver 25. However, as shown in the end view AA ′, the upper part of the shielding plate 27 and the upper end base material receiver 25 are in contact with each other without any gap. In some cases, it is necessary to provide a passage for venting air in the upper end base material receiver 25.

また、A−A’端面図に示すように、遮蔽板27の下端は下端基材受け26よりさらに長く下方まで延長されている。その延長された長さは約90mmとしている。尚、遮蔽板27が回路基材29より下方に30mmより短い場合は遮蔽効果が弱まり、導通用孔開口面の反対面の特に回路基材29の下端部に電解めっき時の電流の回り込みにより、不要なめっきが析出するおそれがある。一方、遮蔽板27が回路基材29より下方に120mm以上長い場合には、下側横枠24と干渉したり、遮蔽板27に付着した液によってめっき液の持ち出し量が増加するなどのデメリットがある。   Further, as shown in the end view of A-A ′, the lower end of the shielding plate 27 is extended further downward than the lower end base material receiver 26. The extended length is about 90 mm. When the shielding plate 27 is shorter than 30 mm below the circuit base material 29, the shielding effect is weakened, and the current flows during electrolytic plating to the lower surface of the circuit base material 29, particularly the opposite surface of the hole opening surface for conduction, Unnecessary plating may be deposited. On the other hand, when the shielding plate 27 is longer than the circuit base material 29 by 120 mm or more, there are disadvantages such as interference with the lower lateral frame 24 and an increase in the amount of plating solution brought out by the liquid adhering to the shielding plate 27. is there.

従って、下側の電流の回り込みに対する遮蔽効果を上げるために、遮蔽板27の下部は手前側へ傾斜が設けられている。但し、めっき液槽や水洗槽から上げたときに、排液が速やかに行われるだけの隙間を、遮蔽板27と下端基材受け26との間に設けておく必要がある。   Therefore, in order to increase the shielding effect against the sneak current on the lower side, the lower part of the shielding plate 27 is inclined toward the front side. However, it is necessary to provide a gap between the shielding plate 27 and the lower end substrate receiver 26 so that the drainage can be quickly performed when the plating solution tank or the washing tank is lifted.

また、下端基材受け26には補助遮蔽板28が取り付けられている。この補助遮蔽板28の高さは20mmとしている。なお、図示しないが、回路基材29と補助遮蔽板28との間に滞留するめっき液や水洗水が適切に排出されるように、下端基材受け26には排液用の通路を設けておく必要がある。   Further, an auxiliary shielding plate 28 is attached to the lower end base material receiver 26. The height of the auxiliary shielding plate 28 is 20 mm. Although not shown in the drawings, a drainage passage is provided in the lower substrate support 26 so that the plating solution and washing water staying between the circuit substrate 29 and the auxiliary shielding plate 28 are appropriately discharged. It is necessary to keep.

図4は、本発明に係る実施例2のラック型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)は端面図である。以下、図4の全図を参照しながら実施例2のラック型基板保持具の構成について説明する。前述の図3と同じく、ラック型基板保持具30は、給電用端子を備えた左右一対の縦枠31,31'が上側横枠33及び下側横枠34で間隔を保持されて固定した枠体を構成している。   4A and 4B are configuration diagrams of a rack-type substrate holder according to the second embodiment of the present invention, in which FIG. 4A is a front view, FIG. 4B is a bottom view, and FIG. 4C is an end view. Hereinafter, the configuration of the rack-type substrate holder according to the second embodiment will be described with reference to all drawings in FIG. As in FIG. 3 described above, the rack-type substrate holder 30 is a frame in which a pair of left and right vertical frames 31 and 31 ′ having power supply terminals are held and fixed by an upper horizontal frame 33 and a lower horizontal frame 34. Make up body.

図4が図3と異なる点は、上側横枠33及び下側横枠34が間隔を変更できるようにスライドする機構を備えている点である。そのため、遮蔽板37、37‘は左右に分割されており、それぞれ、左右の縦枠31、31'に取り付けられている。また、遮蔽板37、37'は、左右の縦枠31、31'に接すると共に、下端基材受け36より下方に延長される長さに構成されている。   FIG. 4 differs from FIG. 3 in that a mechanism for sliding the upper side horizontal frame 33 and the lower side horizontal frame 34 so that the interval can be changed is provided. Therefore, the shielding plates 37 and 37 'are divided into left and right, and are attached to the left and right vertical frames 31, 31', respectively. Further, the shielding plates 37 and 37 ′ are configured to have a length that is in contact with the left and right vertical frames 31 and 31 ′ and extends downward from the lower end base material receiver 36.

すなわち、これらの遮蔽板37、37'は重なり合ってスライドできるように構成されており、上端基材受け35との間には僅かな隙間が生じている。そのため、遮蔽効果を上げるために、遮蔽板37、37’の上側も上端基材受け35を越えて延長される長さに構成され、上側に延長された部分を手前側に傾斜させている。さらに、下端基材受け36には、同様に補助遮蔽板38、38'が取り付けられている。   That is, these shielding plates 37 and 37 ′ are configured to be slidable in an overlapping manner, and a slight gap is generated between the upper end base material receiver 35. Therefore, in order to improve the shielding effect, the upper side of the shielding plates 37 and 37 ′ is also configured to have a length that extends beyond the upper end base material receiver 35, and the portion extended upward is inclined toward the front side. Further, auxiliary shielding plates 38 and 38 ′ are similarly attached to the lower end base material receiver 36.

図5は、本発明に係る実施例3のラック型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)は端面図、(d)は部分拡大図である。以下、図5の全図を参照しながら実施例3のラック型基板保持具の構成について説明する。前述の図3と同じく、ラック型基板保持具40は、給電用端子を備えた左右一対の縦枠41が上側横枠43及び下側横枠44で間隔を保持されて固定された枠体を構成している。その枠体の片面に遮蔽板47が上端基材受け45に取り付けられており、該遮蔽板47は、左右の縦枠41に接すると共に下端基材受け46より下方に延長される長さに構成されている。さらに、下端基材受け46には補助遮蔽板48が設けられている。   FIG. 5 is a configuration diagram of a rack-type substrate holder according to a third embodiment of the present invention, where (a) is a front view, (b) is a bottom view, (c) is an end view, and (d) is a partially enlarged view. FIG. Hereinafter, the configuration of the rack-type substrate holder according to the third embodiment will be described with reference to all drawings in FIG. Similar to FIG. 3 described above, the rack-type substrate holder 40 has a frame body in which a pair of left and right vertical frames 41 provided with power supply terminals are held and fixed by an upper horizontal frame 43 and a lower horizontal frame 44. It is composed. A shielding plate 47 is attached to the upper end base material receiver 45 on one side of the frame, and the shielding plate 47 is configured to have a length that contacts the left and right vertical frames 41 and extends downward from the lower end base material receiver 46. Has been. Further, an auxiliary shielding plate 48 is provided on the lower end base material receiver 46.

図5が図3と相違する点は、遮蔽板47は手前側への傾斜が設けられることなく真っ直ぐに延在している点と、補助遮蔽板48が下端基材受け46の下端に開閉自在に設けられている点である。尚、この補助遮蔽板48は、めっき液に比較して比重が軽い素材で作られている。従って、部分拡大図に示すように、補助遮蔽板48がめっき液中に浸漬されると、浮力により下端基材受け46と遮蔽板47との隙間を塞ぐ形となり、回路基材49の遮蔽板側へのめっきの付き回りを防止している。また、基板保持具40が液面から持ちあげられると、重力によって補助遮蔽板48が自然に解放され、回路基材49と遮蔽板47との間に浸入しためっき液をスムーズに排液させることができる。これによって、補助遮蔽板48により下端基材受け46の上にめっき液が溜まることも無く、遮蔽板47には遮蔽効果を上げるための傾斜を設ける必要がないので、めっき液の持ち出し量をさらに減らすことができる。   5 differs from FIG. 3 in that the shielding plate 47 extends straight without being inclined toward the front side, and the auxiliary shielding plate 48 is openable and closable at the lower end of the lower base support 46. It is a point provided in. The auxiliary shielding plate 48 is made of a material having a specific gravity lower than that of the plating solution. Therefore, as shown in the partially enlarged view, when the auxiliary shielding plate 48 is immersed in the plating solution, the gap between the lower end substrate receiver 46 and the shielding plate 47 is closed by buoyancy, and the shielding plate of the circuit substrate 49 is formed. Prevents the plating on the side. Further, when the substrate holder 40 is lifted from the liquid surface, the auxiliary shielding plate 48 is naturally released by gravity, and the plating solution that has entered between the circuit base material 49 and the shielding plate 47 can be smoothly drained. Can do. As a result, the plating solution does not accumulate on the lower substrate support 46 by the auxiliary shielding plate 48, and the shielding plate 47 does not need to be provided with an inclination for increasing the shielding effect. Can be reduced.

次に、図6乃至図9を参照して、ハンガー型基板保持具における遮蔽板の幾つかの実施例の構成について説明する。   Next, with reference to FIG. 6 thru | or FIG. 9, the structure of the several Example of the shielding board in a hanger type substrate holder is demonstrated.

図6は、本発明に係る実施例4のハンガー型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)はA−A‘端面図、(d)はB−B’端面図である。以下、図6の全図を参照しながら実施例4のハンガー型基板保持具の構成について説明する。すなわち、図6は、本発明に係るハンガー型基板保持具に組み付ける遮蔽板の実施例を示す構造図である。図6において、陰極バー(図示せず)に横移動自在に懸架されるハンガー型基板保持具50は、回路基材59を垂下係止すると共に給電を行うためのクリップ51と、ハンガー型基板保持具50を陰極バー(図示せず)に懸架するためのフック52と、クリップ51とフック52とを繋ぐ肩部53とから構成されている。   6A and 6B are configuration diagrams of a hanger-type substrate holder according to Example 4 of the present invention, in which FIG. 6A is a front view, FIG. 6B is a bottom view, and FIG. 6C is an AA ′ end view. ) Is a BB ′ end view. Hereinafter, the configuration of the hanger-type substrate holder of Example 4 will be described with reference to all the drawings in FIG. That is, FIG. 6 is a structural view showing an embodiment of the shielding plate assembled to the hanger-type substrate holder according to the present invention. In FIG. 6, a hanger type substrate holder 50 suspended on a cathode bar (not shown) so as to be laterally movable includes a clip 51 for hanging the circuit base material 59 and supplying power, and a hanger type substrate holder. It comprises a hook 52 for suspending the tool 50 on a cathode bar (not shown), and a shoulder portion 53 connecting the clip 51 and the hook 52.

遮蔽板57は、ハンガー型基板保持具50に組み付けられ、回路基材59の片面を覆う面積を有している。該遮蔽板57の幅は回路基材59と同等の幅を有すると共に、回路基材59の下端よりも下方に延長される長さに構成されている。本実施例においては、遮蔽板57の把持部57aは肩部53に嵌め込む溝形となっており、把持部57aを肩部53に掛けることで遮蔽板57は前後に動揺しないようになっている。さらに、遮蔽板57には、回路基材59の上端を保持すると共に上側からの電流の回り込みを遮蔽する張出部57bを備えている。また、遮蔽板57の回路基材59の下端より下方に向かっては、遮蔽効果を増すために回路基材59側への傾斜部が設けられている。   The shielding plate 57 is assembled to the hanger-type substrate holder 50 and has an area covering one side of the circuit substrate 59. The width of the shielding plate 57 is equal to the width of the circuit substrate 59 and is configured to extend below the lower end of the circuit substrate 59. In this embodiment, the gripping portion 57a of the shielding plate 57 has a groove shape that fits into the shoulder portion 53, and the shielding plate 57 does not shake back and forth by hanging the gripping portion 57a on the shoulder portion 53. Yes. Further, the shielding plate 57 is provided with an overhanging portion 57b that holds the upper end of the circuit substrate 59 and shields the current from flowing in from the upper side. In addition, an inclined portion toward the circuit base material 59 is provided below the lower end of the circuit base material 59 of the shielding plate 57 in order to increase the shielding effect.

該遮蔽板57は、回路基材59の表面との距離が5〜15mmとなる位置に取り付けられる。遮蔽板57の下端は回路基材59の下端よりさらに長く下方まで延長されている。その延長された長さは約90mmとしている。尚、遮蔽板57が回路基材59より下方に延在する長さが30mmより短い場合は遮蔽効果が弱まり、導通用孔10(図1(c)参照)の開口面の反対面の特に回路基材59の下端部に、電解めっき時の電流の回り込みによって不要なめっきが析出するおそれがある。一方、遮蔽板57が回路基材59より下方
に120mm以上長い場合には、遮蔽板57の重量が増加して全体が傾き把持部57aに負荷が加わったり、付着した液によるめっき液の持ち出し量が増加するなどのデメリットがある。
The shielding plate 57 is attached at a position where the distance from the surface of the circuit substrate 59 is 5 to 15 mm. The lower end of the shielding plate 57 is extended further downward than the lower end of the circuit substrate 59. The extended length is about 90 mm. When the length of the shielding plate 57 extending below the circuit substrate 59 is shorter than 30 mm, the shielding effect is weakened, and in particular the circuit opposite to the opening surface of the conduction hole 10 (see FIG. 1C). There is a possibility that unnecessary plating may be deposited on the lower end portion of the base material 59 due to the wraparound of the current during electrolytic plating. On the other hand, when the shielding plate 57 is longer than the circuit substrate 59 by 120 mm or more, the weight of the shielding plate 57 increases and the entire body is inclined and a load is applied to the gripping portion 57a. There is a demerit such as increase.

また、回路基材59の下端部には下端基材受け56が取り付けられており、下端基材受け56は補助遮蔽板58を有している。該補助遮蔽板58は回路基材59の下端から上方に向かって立設しており、下側からの電流の回り込みを遮蔽する役割を果たしている。なお、図示しないが、回路基材59と補助遮蔽板58との間に滞留するめっき液や水洗水が適切に排出されるように、下端基材受け56には排液用の通路を設けておく。   Further, a lower end base receiver 56 is attached to the lower end portion of the circuit base 59, and the lower end base receiver 56 has an auxiliary shielding plate 58. The auxiliary shielding plate 58 is erected upward from the lower end of the circuit base material 59 and plays a role of shielding current wraparound from the lower side. Although not shown, a drainage passage is provided in the lower substrate receiver 56 so that the plating solution and washing water staying between the circuit substrate 59 and the auxiliary shielding plate 58 are appropriately discharged. deep.

図7は、本発明に係る実施例5のハンガー型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)はA−A‘端面図、(d)はB−B’端面図である。以下、図7の全図を参照しながら実施例5のハンガー型基板保持具の構成について説明する。図7は、図6と同様に、遮蔽板67が、ハンガー型基板保持具60の肩部63に嵌め込む把持部67a、及び回路基材69の上端を保持すると共に上側からの電流の回り込みを遮蔽する張出部67bを備えている。   7A and 7B are configuration diagrams of a hanger-type substrate holder of Example 5 according to the present invention, in which FIG. 7A is a front view, FIG. 7B is a bottom view, and FIG. 7C is an AA ′ end view. ) Is a BB ′ end view. Hereinafter, the configuration of the hanger-type substrate holder of the fifth embodiment will be described with reference to all the drawings in FIG. In FIG. 7, as in FIG. 6, the shielding plate 67 holds the upper end of the gripping portion 67 a and the circuit base 69 that fit into the shoulder portion 63 of the hanger-type substrate holder 60 and wraps around the current from the upper side. An overhanging portion 67b for shielding is provided.

図7が図6と相違する点は、遮蔽板67が回路基材69の下端より下方に向かって延在されているが傾斜部を有しない点と、下端基材受け66に設けられている補助遮蔽板68が下端基材受け66から遮蔽板方向に突き出していて、下方に湾曲されている点である。   FIG. 7 differs from FIG. 6 in that the shielding plate 67 extends downward from the lower end of the circuit substrate 69 but does not have an inclined portion, and is provided in the lower substrate support 66. The auxiliary shielding plate 68 protrudes from the lower end base material receiver 66 toward the shielding plate and is curved downward.

この補助遮蔽板68は、遮蔽板67側に対向する回路基材69の表面へ下方からめっき液が回り込むのを防止すると共に、遮蔽板67との距離を所定間隔に保持するための役割を果たすものであり、めっき液中で回路基材69が液流による圧力を受けても、回路基材69が遮蔽板67に接触することを防止する働きがある。また、ハンガー型基板保持具60が液面から持ちあげられると、補助遮蔽板68は下方に湾曲しているので、該補助遮蔽板68は、めっき液の流れに伴って遮蔽板67との間隔が広がり、スムーズに排液することができる。さらに、湾曲された補助遮蔽板68により下端基材受け66の上にめっき液が溜まることもなくなる。これによって、遮蔽板67には遮蔽効果を上げるための傾斜を設ける必要がないので、めっき液の持ち出し量をさらに減らすことができる。   The auxiliary shielding plate 68 serves to prevent the plating solution from flowing into the surface of the circuit base material 69 facing the shielding plate 67 from below and to keep the distance from the shielding plate 67 at a predetermined interval. Even if the circuit base material 69 receives a pressure due to the liquid flow in the plating solution, the circuit base material 69 has a function of preventing the circuit base material 69 from contacting the shielding plate 67. When the hanger-type substrate holder 60 is lifted from the liquid level, the auxiliary shielding plate 68 is curved downward, so that the auxiliary shielding plate 68 is spaced from the shielding plate 67 as the plating solution flows. Can spread and drain smoothly. In addition, the plating solution does not accumulate on the lower end substrate receiver 66 by the curved auxiliary shielding plate 68. Thereby, since it is not necessary to provide the shielding plate 67 with an inclination for increasing the shielding effect, the amount of the plating solution taken out can be further reduced.

図8は、本発明に係る実施例6のハンガー型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)はA−A‘端面図、(d)はB−B’端面図、(e)は部分拡大図である。以下、図8の全図を参照しながら実施例6のハンガー型基板保持具の構成について説明する。   FIG. 8: is a block diagram of the hanger type | mold board | substrate holder of Example 6 which concerns on this invention, (a) is a front view, (b) is a bottom view, (c) is an AA 'end surface figure, (d ) Is an end view of BB ', and (e) is a partially enlarged view. Hereinafter, the configuration of the hanger-type substrate holder of Example 6 will be described with reference to all the drawings in FIG.

図8は、図7と同様に、遮蔽板77が、ハンガー型基板保持具70の肩部73に嵌め込む把持部77aと、回路基材79の上端を保持すると共に上側からの電流の回り込みを遮蔽する張出部77bとを有しており、該遮蔽板77の回路基材79の下端より下方に延在された部分は傾斜されていない。   In FIG. 8, similarly to FIG. 7, the shielding plate 77 holds the gripping portion 77 a that fits into the shoulder portion 73 of the hanger type substrate holder 70, and the upper end of the circuit base material 79, and wraps around the current from the upper side. The portion of the shielding plate 77 extending downward from the lower end of the circuit substrate 79 is not inclined.

図8が図7と相違する点は、下端基材受け76に設けられている補助遮蔽板78が開閉自在に設けられている点である。すなわち、前述の図5と同様に、補助遮蔽板78は、めっき液に比較して比重が軽い素材で形成されている。従って、図8(e)に示すように、めっき液中に浸漬されると、浮力によって補助遮蔽板78が下端基材受け66と遮蔽板67との隙間を塞ぐ形となり、回路基材79の遮蔽板77側の表面へのめっき付き回りを防止することができる。   FIG. 8 differs from FIG. 7 in that an auxiliary shielding plate 78 provided on the lower end base material receiver 76 is provided so as to be freely opened and closed. That is, as in FIG. 5 described above, the auxiliary shielding plate 78 is formed of a material having a light specific gravity compared to the plating solution. Therefore, as shown in FIG. 8 (e), when immersed in the plating solution, the auxiliary shielding plate 78 closes the gap between the lower end substrate receiver 66 and the shielding plate 67 by buoyancy, and the circuit substrate 79 It is possible to prevent plating around the surface on the shielding plate 77 side.

また、ハンガー型基板保持具70が液面から持ちあげられると、補助遮蔽板78の重力によって下端基材受け66と遮蔽板67との隙間が自然に解放されるので、回路基材79と遮蔽板77との間に浸入しためっき液をスムーズに排液することができる。尚、遮蔽板77と補助遮蔽板78との隙間は、図7の場合より大きく開くので、さらにめっき液の排液はスムースに行われるので、めっき液の持ち出し量も減らすことができる。   Further, when the hanger-type substrate holder 70 is lifted from the liquid surface, the gap between the lower-end base material receiver 66 and the shielding plate 67 is naturally released by the gravity of the auxiliary shielding plate 78, so that the circuit substrate 79 and the shielding member are shielded. The plating solution which has entered between the plates 77 can be drained smoothly. Since the gap between the shielding plate 77 and the auxiliary shielding plate 78 is larger than that in the case of FIG. 7, the plating solution is drained more smoothly, so that the amount of the plating solution taken out can be reduced.

図9は、本発明に係る実施例7のハンガー型基板保持具の構成図であり、(a)は正面図、(b)は下面図、(c)はA−A‘端面図、(d)はB−B’端面図である。以下、図9の全図を参照しながら実施例7のハンガー型基板保持具の構成について説明する。図9は、図6と同じく、遮蔽板87が、ハンガー型基板保持具80の肩部83に嵌め込む把持部87aと、回路基材89の上端を保持すると共に上側からの電流の回り込みを遮蔽する張出部87bとを有しており、遮蔽板87の回路基材89の下端より下方の部分は、回路基材89側に向かって傾斜することなく垂直に延びている。   9A and 9B are configuration diagrams of a hanger-type substrate holder according to Example 7 of the present invention, in which FIG. 9A is a front view, FIG. 9B is a bottom view, and FIG. 9C is an AA ′ end view. ) Is a BB ′ end view. Hereinafter, the configuration of the hanger-type substrate holder of the seventh embodiment will be described with reference to all the drawings in FIG. 9, as in FIG. 6, the shielding plate 87 holds the upper end of the gripping portion 87 a fitted into the shoulder portion 83 of the hanger-type substrate holder 80 and the circuit base material 89 and shields the current wraparound from the upper side. The portion below the lower end of the circuit substrate 89 of the shielding plate 87 extends vertically without inclining toward the circuit substrate 89 side.

図9が図6と相違する点は、下端基材受けを取り付けることなく、補助遮蔽板88が、遮蔽板87と回路基材89の下端位置との間に取り付けられ、回路基材89の方向に突き出して下方に湾曲して設けられている点である。該補助遮蔽板88は、下方からの回路基材89の遮蔽板87側の表面へのめっき付き回りを防止すると共に、回路基材89と遮蔽板87との間隔を保持する役割を果たしている。   9 differs from FIG. 6 in that the auxiliary shielding plate 88 is attached between the shielding plate 87 and the lower end position of the circuit substrate 89 without attaching the lower substrate support, and the direction of the circuit substrate 89 is different. It is a point which protrudes and curves downward. The auxiliary shielding plate 88 serves to prevent the circuit base 89 from being plated around the surface of the circuit base 89 on the side of the shielding plate 87 and to maintain the distance between the circuit base 89 and the shielding plate 87.

また、ハンガー型基板保持具80が液面から持ちあげられると、めっき液の流れによって回路基材87が撓んで、該回路基材87と補助遮蔽板88との間隔が広がるのでスムーズに排液することができる。このようにして補助遮蔽板88を遮蔽板87に取り付けたことにより、下端基材受けを回路基材87に取り付ける手間がかからなくなり、より効率的に多層プリント配線板を製造することができる。   Further, when the hanger-type substrate holder 80 is lifted from the liquid surface, the circuit base 87 is bent by the flow of the plating solution, and the distance between the circuit base 87 and the auxiliary shielding plate 88 is widened, so that the liquid drains smoothly. can do. Since the auxiliary shielding plate 88 is attached to the shielding plate 87 in this manner, the trouble of attaching the lower end base material receiver to the circuit base material 87 is eliminated, and a multilayer printed wiring board can be manufactured more efficiently.

以上説明したように、本発明の多層プリント配線板の製造方法によれば、煩雑なレジスト形成等の工程を行うことなく、生産性よく、片面めっきを行うことができる。また、剥離後のフィルム残渣物の処理の必要もなく、これら副資材コストも必要がない。加えて、これらの微粘着フィルムや熱発泡フィルムによるめっき浴の汚染も全く懸念する必要がない。さらに、めっき装置の個体差により陽極と回路材間の距離差が存在する場合でも、電解めっき厚の差は発生せず、その後のフォトファブリケーション手法によるエッチング加工で形成される回路パターンの微細化が容易である。これらのことから、片側のみにビアホールの開口を有するブラインドビアホール接続による多層プリント配線板を安価且つ安定的に製造する方法、並びに上述の多層プリント配線板の製造に適したラック型基板保持具、及びハンガー型基板保持具に組み付ける遮蔽板を提供することができる。   As described above, according to the method for producing a multilayer printed wiring board of the present invention, single-side plating can be performed with high productivity without performing complicated steps such as resist formation. In addition, there is no need to treat the film residue after peeling, and there is no need for these secondary material costs. In addition, there is no need to worry at all about the contamination of the plating bath by these slightly adhesive films and thermally foamed films. Furthermore, even if there is a difference in the distance between the anode and the circuit material due to individual differences in the plating equipment, there is no difference in the thickness of the electrolytic plating, and the circuit pattern formed by the subsequent etching process using photofabrication techniques is miniaturized. Is easy. From these, a method for inexpensively and stably manufacturing a multilayer printed wiring board by blind via hole connection having a via hole opening only on one side, a rack-type substrate holder suitable for manufacturing the above-mentioned multilayer printed wiring board, and The shielding board assembled | attached to a hanger type | mold board | substrate holder can be provided.

以上述べたように本発明の実施例の幾つかを説明したが、本発明は、上記の実施例に限定されることなく、本発明の精神を逸脱しない限り種々の改変を為すことができ、そして、本発明が該改変されたものに及ぶことは当然である。   As described above, some of the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. The present invention naturally extends to the modified one.

本発明による多層プリント配線板の製造方法及び基板保持具並びに遮蔽板によれば、生産性の良好な状態で基板に片面めっき処理を行うことができるので、半導体実装基板の製造装置などにも有効に利用することができる。   According to the multilayer printed wiring board manufacturing method, the substrate holder and the shielding plate according to the present invention, the single-side plating process can be performed on the substrate with good productivity, which is also effective for a semiconductor mounting substrate manufacturing apparatus. Can be used.

1 可撓性絶縁ベース材
2 銅箔
2a コンフォーマルマスク
2b 回路パターン
3 銅箔
3a コンフォーマルマスク
3b 回路パターン
4 両面銅張積層板
5 接着剤
6 可撓性絶縁ベース材
7 銅箔
7b 回路パターン
8 片面銅張積層板
9 回路基材
10 導通用孔
11 めっき層(めっき皮膜)
12 ステップビアホール
13 遮蔽板
20,30,40 ラック型基板保持具
21,31,31',41 縦枠
21a,31a,31a',41a 支柱
21b,31b,31b',41b 基板押さえ板
21c,31c,41c 蝶番
22,32,42 フック
23,33,43 上側横枠
24,34,44 下側横枠
25,35,45 上端基材受け
26,36,46 下端基材受け
27,37,37',47 遮蔽板
28,38,38',48 補助遮蔽板
29,39,49 回路基材
50,60,70,80 ハンガー型基板保持具
51,61,71,81 クリップ
52,62,72,82 フック
53,63,73,83 肩部
56,66,76 下端基材受け
57,67,77,87 遮蔽板
57a,67a,77a,87a 把持部
57b,67b,77b,87b 張出部
58,68,78,88 補助遮蔽板
59,69,79,89 回路基材
DESCRIPTION OF SYMBOLS 1 Flexible insulating base material 2 Copper foil 2a Conformal mask 2b Circuit pattern 3 Copper foil 3a Conformal mask 3b Circuit pattern 4 Double-sided copper clad laminated board 5 Adhesive 6 Flexible insulating base material 7 Copper foil 7b Circuit pattern 8 Single-sided copper-clad laminate 9 Circuit base material 10 Conductive hole 11 Plating layer (plating film)
12 Step via hole 13 Shield plate 20, 30, 40 Rack type substrate holder 21, 31, 31 ', 41 Vertical frame 21a, 31a, 31a', 41a Post 21b, 31b, 31b ', 41b Substrate holding plate 21c, 31c, 41c Hinge 22, 32, 42 Hook 23, 33, 43 Upper lateral frame 24, 34, 44 Lower lateral frame 25, 35, 45 Upper end base receiver 26, 36, 46 Lower end base receiver 27, 37, 37 ', 47 Shield plate 28, 38, 38 ', 48 Auxiliary shield plate 29, 39, 49 Circuit base material 50, 60, 70, 80 Hanger type substrate holder 51, 61, 71, 81 Clip 52, 62, 72, 82 Hook 53,63,73,83 Shoulder portion 56,66,76 Lower end substrate receiver 57,67,77,87 Shield plate 57a, 67a, 77a, 87a Gripping portion 57b, 67b, 77b, 87b Overhang portion 58,68, 78,88 Auxiliary shielding plate 59,69,79,89 Circuit substrate

Claims (5)

多層プリント配線板の製造方法において、
3層以上の導電層と前記各導電層間に介在された絶縁層とを有する回路基材を作成する第1の工程と、
前記回路基材の一方面の最外層の導電層から他方面の最外層の導電層に至る経路において、前記一方面のみに開口部を有する非貫通の導通用孔を形成する第2の工程と、
前記導通用孔の内壁に対して導電化処理を行う第3の工程と、
前記回路基材の片面を覆う面積を有し、且つ、該回路基材より下方に延長する長さを有する遮蔽板を備えた基板保持具を用意する第4の工程と、
前記開口部を有する前記一方面と反対の面側を前記遮蔽板に向けて、前記回路基材を前記基板保持具に取り付ける第5の工程と、
前記基板保持具に取り付けられた前記回路基材をめっき液に浸漬させ、電解めっき処理を行って片側のみに開口部を有するビアホールを形成する第6の工程と
を含むことを特徴とする多層プリント配線板の製造方法。
In the method for producing a multilayer printed wiring board,
A first step of creating a circuit substrate having three or more conductive layers and an insulating layer interposed between the conductive layers;
A second step of forming a non-penetrating conduction hole having an opening only on the one surface in a path from the outermost conductive layer on one surface of the circuit substrate to the outermost conductive layer on the other surface; ,
A third step of conducting a conductive treatment on the inner wall of the hole for conduction;
A fourth step of preparing a substrate holder having a shielding plate having an area covering one side of the circuit base material and having a length extending downward from the circuit base material;
A fifth step of attaching the circuit base to the substrate holder with the surface opposite to the one surface having the opening facing the shielding plate;
And a sixth step of immersing the circuit base material attached to the substrate holder in a plating solution and performing an electrolytic plating process to form a via hole having an opening only on one side. A method for manufacturing a wiring board.
多層プリント配線板の製造方法において、
3層以上の導電層と前記各導電層間に介在された絶縁層とを有する回路基材を作成する第1の工程と、
前記回路基材の一方面の最外層の導電層から他方面の最外層の導電層に至る経路において、前記一方面のみに開口部を有する非貫通の導通用孔を形成する第2の工程と、
前記導通用孔の内壁に対して導電化処理を行う第3の工程と、
前記回路基材へ給電する給電用端子を備えた一対の縦枠を上側横枠及び下側横枠で間隔を保持して固定した枠体を有し、且つ、前記一対の縦枠間に前記回路基材を上端で受ける上端基材受け及び下端で受ける下端基材受けを有し、左右の前記一対の縦枠に接すると共に前記上端基材受けから前記下端基材受けより下方まで延長する長さを有する遮蔽板を設けたラック型基板保持具を用意する第4の工程と、
前記開口部を有する前記一方面と反対の面側を前記遮蔽板に向けて、前記回路基材の両横端部を前記基板保持具の前記給電用端子に接するように取り付ける第5の工程と、
前記ラック型基板保持具に取り付けられた前記回路基材をめっき液に浸漬させ、電解めっき処理を行って、片側のみに開口を有するビアホールを形成する第6の工程と
を含むことを特徴とする多層プリント配線板の製造方法。
In the method for producing a multilayer printed wiring board,
A first step of creating a circuit substrate having three or more conductive layers and an insulating layer interposed between the conductive layers;
A second step of forming a non-penetrating conduction hole having an opening only on the one surface in a path from the outermost conductive layer on one surface of the circuit substrate to the outermost conductive layer on the other surface; ,
A third step of conducting a conductive treatment on the inner wall of the hole for conduction;
A frame having a pair of vertical frames provided with power supply terminals for supplying power to the circuit substrate, the upper horizontal frame and the lower horizontal frame being held at intervals, and between the pair of vertical frames The upper base material receiver that receives the circuit base material at the upper end and the lower base material receiver that receives the circuit base material at the lower end, is in contact with the pair of left and right vertical frames, and extends from the upper end base material receiver to below the lower base material receiver. A fourth step of preparing a rack-type substrate holder provided with a shielding plate having a thickness;
A fifth step of attaching the lateral ends of the circuit base so as to be in contact with the power supply terminals of the substrate holder, with the side opposite to the one side having the opening facing the shielding plate; ,
And a sixth step of forming a via hole having an opening only on one side by immersing the circuit base material attached to the rack-type substrate holder in a plating solution and performing an electrolytic plating process. A method for producing a multilayer printed wiring board.
多層プリント配線板の製造方法において、
3層以上の導電層と前記各導電層間に介在された絶縁層とを有する回路基材を作成する第1の工程と、
前記回路基材の一方面のみに開口部を有し、前記一方面の最外層の導電層から他方面の最外層の導電層に至る経路において、前記一方面のみに開口を有する非貫通の導通用孔を形成する第2の工程と、
前記導通用孔内壁に対して導電化処理を行う第3の工程と、
陰極バーに横移動自在に支持され、前記回路基材と同等幅を有するとともに前記回路基材の上端から下端よりも下方まで延長する長さを持つ遮蔽板が懸架されたハンガー型の基板保持具の給電を行うクリップに、前記回路基材を垂下係止して取り付ける第4の工程と、
前記回路基材をめっき液に浸漬させ、他のハンガー型基板保持具と隣接した状態で電解めっき処理を行い、片側のみに開口を有するビアホールを形成する第5の工程と
を含むことを特徴とする多層プリント配線板の製造方法。
In the method for producing a multilayer printed wiring board,
A first step of creating a circuit substrate having three or more conductive layers and an insulating layer interposed between the conductive layers;
A non-penetrating conductive material having an opening only on one surface of the circuit substrate and having an opening only on the one surface in a path from the outermost conductive layer on the one surface to the outermost conductive layer on the other surface. A second step of forming a common hole;
A third step of conducting a conductive treatment on the inner wall of the hole for conduction;
A hanger-type substrate holder that is supported by a cathode bar so as to be laterally movable, has a width equal to that of the circuit substrate, and is suspended by a shielding plate that extends from the upper end to the lower end of the circuit substrate. A fourth step of hanging and attaching the circuit base material to a clip for supplying power;
Including a fifth step of immersing the circuit base material in a plating solution, performing electrolytic plating in a state adjacent to another hanger-type substrate holder, and forming a via hole having an opening only on one side. A method for manufacturing a multilayer printed wiring board.
多層プリント配線板の製造に用いられるラック型基板保持具であって、
回路基材への給電用端子を備えた一対の縦枠を上側及び下側の横枠で間隔を保持して固
定した枠体を有し、且つ、前記一対の縦枠間に前記回路基材を上端で受ける上端基材受け及び下端で受ける下端基材受けを有し、左右の前記一対の縦枠に接すると共に前記上端基材受けから前記下端基材受けより下方まで延長する長さを有する遮蔽板を設けることを特徴とするラック型基板保持具。
A rack-type substrate holder used for manufacturing a multilayer printed wiring board,
A circuit body having a frame body in which a pair of vertical frames having terminals for feeding power to the circuit substrate is fixed with an upper and lower horizontal frame being held apart, and the circuit substrate is interposed between the pair of vertical frames. The upper end base receiving and the lower end base receiving at the lower end are in contact with the pair of left and right vertical frames and have a length extending from the upper end receiving base to the lower end receiving base. A rack-type substrate holder comprising a shielding plate.
陰極バーに横移動自在に懸架され、回路基材を垂下係止すると共に給電を行うハンガー型基板保持具に取り付ける遮蔽板であって、
前記ハンガー型基板保持具の肩部に取り付ける把持部と、前記回路基材の上端を保持すると共に遮蔽する張出部とを備え、前記回路基材と同等幅を有し、且つ、前記回路基材の上端から下端よりも下方まで延長する長さを有することを特徴とする遮蔽板。
A shielding plate attached to a hanger-type substrate holder that is suspended on a cathode bar so as to be laterally movable and that suspends and locks a circuit base material and supplies power,
A grip portion to be attached to a shoulder portion of the hanger-type substrate holder; and an overhang portion that holds and shields an upper end of the circuit base material, has a width equivalent to the circuit base material, and has the circuit base A shielding plate having a length extending from the upper end to the lower side of the lower end of the material.
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