JP4391223B2 - Method for manufacturing printed wiring board - Google Patents

Method for manufacturing printed wiring board Download PDF

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JP4391223B2
JP4391223B2 JP2003426110A JP2003426110A JP4391223B2 JP 4391223 B2 JP4391223 B2 JP 4391223B2 JP 2003426110 A JP2003426110 A JP 2003426110A JP 2003426110 A JP2003426110 A JP 2003426110A JP 4391223 B2 JP4391223 B2 JP 4391223B2
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wiring board
printed wiring
circuit conductor
edge portion
photoresist
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JP2005183861A (en
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徳文 服部
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Furukawa Electric Co Ltd
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Furukawa Electric Co Ltd
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Description

本発明は、ソルダーレジストが被膜されたプリント配線板の製造方法に関するものである。   The present invention relates to a method for producing a printed wiring board coated with a solder resist.

プリント配線板1とは、図3(d)のように、絶縁板2(ベークライト、エポキシ樹脂など電気を通さない材料)の面に所望の平面状のパターンを有する回路導体3を形成したものである。   The printed wiring board 1 is formed by forming a circuit conductor 3 having a desired flat pattern on the surface of an insulating plate 2 (a material that does not conduct electricity such as bakelite and epoxy resin) as shown in FIG. is there.

かかるプリント配線板1を製造するためには、まず、図3(a)に示したように、回路導体3を構成するための金属箔4を絶縁板2に接着する。次に、図3(b)に示したように、金属箔4の上面にフォトレジスト5を塗布し、所望の配線パターンが描かれたマスクを重ねて露光し、現像する。その後、図3(c)に示したように、フォトレジスト5に覆われていない金属箔4の面をエッチングする。以上の工程を経ることにより、図3(d)のような所望の平面状のパターンを有する回路導体3が形成されたプリント配線板1を得る(特許文献1の第3図(a)〜(c)参照)。   In order to manufacture the printed wiring board 1, first, as shown in FIG. 3A, a metal foil 4 for constituting the circuit conductor 3 is bonded to the insulating plate 2. Next, as shown in FIG. 3B, a photoresist 5 is applied to the upper surface of the metal foil 4, and a mask on which a desired wiring pattern is drawn is superimposed and exposed, and developed. Thereafter, as shown in FIG. 3C, the surface of the metal foil 4 not covered with the photoresist 5 is etched. By passing through the above process, the printed wiring board 1 in which the circuit conductor 3 which has a desired planar pattern like FIG.3 (d) was formed is obtained (FIG. 3 (a)-(3) of patent document 1). c)).

このようにして得られたプリント配線板1には、集積回路、抵抗、コイル、コンデンサ等の部品がハンダにより接続されて、電気回路、電子回路が構成される。ここで、ハンダ付けを自動ハンダ付け装置によって行う場合は、部品のリード部とハンダ付けをするプリント配線板1の回路導体3の箇所以外のプリント配線板1の面にハンダが付着しないようにしなければならない。   Components such as an integrated circuit, a resistor, a coil, and a capacitor are connected to the printed wiring board 1 thus obtained by soldering to constitute an electric circuit and an electronic circuit. Here, when soldering is performed by an automatic soldering apparatus, it is necessary to prevent solder from adhering to the surface of the printed wiring board 1 other than the parts of the circuit conductor 3 of the printed wiring board 1 to be soldered. I must.

そのため、図3(e)に示したように、部品のリード部とハンダ付けをするプリント配線板1の回路導体3の箇所以外のプリント配線板1の面にソルダーレジスト6が被膜されたプリント配線板1を製造することが行なわれている。なお、ソルダーレジスト6は、上記の目的以外にも回路導体3の腐食を防止するためにも用いられる。   Therefore, as shown in FIG. 3E, the printed wiring board is coated with the solder resist 6 on the surface of the printed wiring board 1 other than the circuit conductor 3 of the printed wiring board 1 to be soldered with the lead part of the component. Production of the plate 1 is carried out. Note that the solder resist 6 is used for preventing corrosion of the circuit conductor 3 in addition to the above purpose.

ソルダーレジスト6の塗布を行なうためには、まず、プリント配線板1の全面に液状のフォトソルダーレジストを塗布し、フォトマスクを介して露光した後にフォトソルダーレジストを現像し、次いでこのフォトソルダーレジストを硬化させることにより、図3(e)に示したように、部品のリード部とハンダ付けをするプリント配線板1の回路導体3の箇所以外のプリント配線板1の面にソルダーレジスト6の被膜が形成される。   In order to apply the solder resist 6, first, a liquid photo solder resist is applied to the entire surface of the printed wiring board 1. After exposure through a photomask, the photo solder resist is developed, and then the photo solder resist is applied. By curing, as shown in FIG. 3 (e), the solder resist 6 film is formed on the surface of the printed wiring board 1 other than the location of the circuit conductor 3 of the printed wiring board 1 to be soldered to the lead part of the component. It is formed.

特開平1−295486号公報JP-A-1-295486

プリント配線板1を電流容量が大きい電源回路といったものに適用する場合、プリント配線板1の回路導体3にも大電流が流れる。そのため、こういったものに使用されるプリント配線板1では、従来の10〜70μm厚の金属箔4に代えて、厚さ100μm以上の金属箔4を回路導体3に使用する。   When the printed wiring board 1 is applied to a power supply circuit having a large current capacity, a large current also flows through the circuit conductor 3 of the printed wiring board 1. Therefore, in the printed wiring board 1 used for such a thing, instead of the conventional metal foil 4 with a thickness of 10 to 70 μm, a metal foil 4 with a thickness of 100 μm or more is used for the circuit conductor 3.

しかしながら、図3(c)に示した金属箔4をエッチングする工程において、金属箔4の厚さにかかわらず、回路導体3のエッヂ部7がオーバーハングして尖った形状になる(図4(b),特許文献1の第3図図(d)参照)。   However, in the step of etching the metal foil 4 shown in FIG. 3C, the edge portion 7 of the circuit conductor 3 is overhanged and has a pointed shape regardless of the thickness of the metal foil 4 (FIG. 4 ( b), FIG. 3 (d) of Patent Document 1).

また、金属箔4が厚い場合であると、図4(a)の丸点線で囲まれた箇所に示したように、回路導体3のエッヂ部7に十分な厚さのソルダーレジスト6の被膜を形成することができないという問題が生じる。このようにして製造されたプリント配線板1は回路導体3の電気絶縁性が不良で、製品としてのプリント配線板の信頼性が低く大電流用途に適さない。   If the metal foil 4 is thick, a solder resist 6 film having a sufficient thickness is applied to the edge portion 7 of the circuit conductor 3 as shown in the part surrounded by the round dotted line in FIG. The problem arises that it cannot be formed. The printed wiring board 1 manufactured in this way has poor electrical insulation of the circuit conductor 3, and the printed wiring board as a product has low reliability and is not suitable for large current applications.

そこで、図5(c)に示したように、回路導体3,3´間のギャップを樹脂8で埋めて回路導体3,3´間をフラットな状態にして、部品のリード部とハンダ付けをするプリント配線板1の回路導体3の箇所以外の回路導体3にソルダーレジスト6を塗布することが行なわれている。   Therefore, as shown in FIG. 5 (c), the gap between the circuit conductors 3 and 3 'is filled with the resin 8 so that the circuit conductors 3 and 3' are in a flat state, and the lead portions of the parts and soldering are performed. A solder resist 6 is applied to the circuit conductor 3 other than the circuit conductor 3 of the printed wiring board 1 to be printed.

これを行なうには、まず図5(a)に示したように、回路導体3が形成されたプリント配線板1の全面に熱硬化性樹脂8、あるいは光硬化性樹脂8を塗布する。そして、図5(b)に示したように、樹脂8が塗布された面を研磨、又は塗布した樹脂8についてリソグラフィを行なって、回路導体3上に残存している樹脂8を除去してフラットにする。最後に図5(c)に示したように、回路導体3,3´間がフラットな面にソルダーレジスト6を塗布する。   To do this, first, as shown in FIG. 5A, a thermosetting resin 8 or a photocurable resin 8 is applied to the entire surface of the printed wiring board 1 on which the circuit conductor 3 is formed. Then, as shown in FIG. 5B, the surface on which the resin 8 is applied is polished, or lithography is performed on the applied resin 8, and the resin 8 remaining on the circuit conductor 3 is removed and flattened. To. Finally, as shown in FIG. 5C, a solder resist 6 is applied on the flat surface between the circuit conductors 3 and 3 '.

しかしながら、この方法では、樹脂8を塗布する工程、及び、樹脂8を研磨またはリソグラフィする工程が余分に必要である。特に、樹脂8を研磨する場合には樹脂8の残査が残るという問題があった。またリソグラフィによって樹脂8を除去する場合はマスクの位置ずれが起こり、部品のリード部とハンダ付けをするプリント配線板1の回路導体3の箇所以外の回路導体3がむき出しになるという問題があった。   However, this method requires an extra step of applying the resin 8 and a step of polishing or lithography the resin 8. In particular, when the resin 8 is polished, there is a problem that a residue of the resin 8 remains. Further, when the resin 8 is removed by lithography, there is a problem in that the position of the mask is displaced, and the circuit conductor 3 other than the circuit conductor 3 portion of the printed wiring board 1 to be soldered is exposed. .

さらに、回路導体3が厚くなると、溝埋め剤の樹脂8の厚みも厚くしなければならない。そのため、熱衝撃によって樹脂8にクラックが入りやすくなり、電気的信頼性を低下させてしまう。   Further, when the circuit conductor 3 becomes thicker, the thickness of the groove filling resin 8 must also be increased. Therefore, cracks are easily generated in the resin 8 due to thermal shock, and the electrical reliability is lowered.

そこで、本発明は回路導体3間のギャップを埋めるための樹脂8を使用することなく、回路導体3のエッヂ部7がソルダーレジスト6で確実に被膜されたプリント配線板1の製造方法の提供を目的とする。   Therefore, the present invention provides a method for manufacturing the printed wiring board 1 in which the edge portion 7 of the circuit conductor 3 is reliably coated with the solder resist 6 without using the resin 8 for filling the gap between the circuit conductors 3. Objective.

請求項1に係る発明は、絶縁板上に形成した回路導体にソルダーレジストが被膜されたプリント配線板の製造方法において、前記回路導体の厚さが120μm以上であり、絶縁板上に接着した金属箔の上面にフォトレジストを塗布し、所望のパターンが描かれたマスクを重ねて現像し、エッチングして該絶縁板上に前記回路導体を形成した後、前記フォトレジストを除去するとともに、再度フォトレジストを塗布し、前記回路導体のエッヂ部がはみ出るようなパターンが描かれたマスクを重ねて現像し、前記エッヂ部以外の前記回路導体上面のみが前記フォトレジストに覆われたレジストパターンを形成し、しかる後、前記回路導体をエッチングして、前記回路導体のエッヂ部に丸みを形成する工程を少なくとも含むことを特徴とする。 The invention according to claim 1 is a method of manufacturing a printed wiring board in which a solder resist is coated on a circuit conductor formed on an insulating plate, wherein the thickness of the circuit conductor is 120 μm or more, and the metal adhered on the insulating plate the photoresist is applied to the upper surface of the foil, and developed using a mask on which a desired pattern is drawn, after forming the circuit conductor on the insulating plate is etched, thereby removing the photoresist, again photo A resist is applied, and a mask on which a pattern in which the edge portion of the circuit conductor protrudes is overlaid and developed to form a resist pattern in which only the upper surface of the circuit conductor other than the edge portion is covered with the photoresist. Thereafter, the method includes at least a step of etching the circuit conductor to form a roundness in the edge portion of the circuit conductor.

本発明に係るプリント配線板の製造方法により製造されたプリント配線板は、回路導体のエッヂ部に丸みが形成されているため、回路導体のエッヂ部がソルダーレジストで確実に被膜される。また、本発明に係るプリント配線板の製造方法では、回路導体のエッヂ部に容易に丸みを形成することができる。   Since the printed wiring board manufactured by the method for manufacturing a printed wiring board according to the present invention is rounded at the edge portion of the circuit conductor, the edge portion of the circuit conductor is reliably coated with the solder resist. Further, in the method for manufacturing a printed wiring board according to the present invention, the edge portion of the circuit conductor can be easily rounded.

本発明の実施形態に係るプリント配線板の製造方法により製造されるプリント配線板の断面を図1に示す。
このプリント配線板1は、絶縁板2の面に所望の平面状のパターンを有する回路導体3が形成されてなるものである。そして、部品のリード部とハンダ付けをする回路導体3の箇所以外のプリント配線板1の面はソルダーレジスト6で覆われている。
The cross section of the printed wiring board manufactured by the manufacturing method of the printed wiring board which concerns on embodiment of this invention is shown in FIG.
This printed wiring board 1 is formed by forming a circuit conductor 3 having a desired flat pattern on the surface of an insulating plate 2. The surface of the printed wiring board 1 other than the part of the circuit conductor 3 to be soldered with the lead part of the component is covered with a solder resist 6.

本発明に係るプリント配線板の製造方法により製造されるプリント配線板1は、プリント配線板1の回路導体3のエッヂ部7に丸みが形成されていることである。これにより、以下で説明するように、回路導体3のエッヂ部7に覆われるソルダーレジスト6の厚さが薄くならないという効果がある。   The printed wiring board 1 manufactured by the method for manufacturing a printed wiring board according to the present invention is that the edge portion 7 of the circuit conductor 3 of the printed wiring board 1 is rounded. Accordingly, as described below, there is an effect that the thickness of the solder resist 6 covered with the edge portion 7 of the circuit conductor 3 is not reduced.

プリント配線板1の回路導体3のエッヂ部7に丸みが形成されることによって発揮される上記効果は、回路導体3が厚いほど顕著となる。具体的には、回路導体3の厚さが120μm以上であることが望ましい。   The above-described effect that is exhibited when the edge portion 7 of the circuit conductor 3 of the printed wiring board 1 is rounded becomes more significant as the circuit conductor 3 is thicker. Specifically, the thickness of the circuit conductor 3 is desirably 120 μm or more.

以上の構成よりなる本発明に係るプリント配線板の製造方法により製造されたプリント配線板1では、回路導体3のエッヂ部7において十分な厚さのソルダーレジスト6の被膜が形成される。そのため、部品のリード部とハンダ付けをするプリント配線板1の回路導体3の箇所以外の回路導体3がむき出しになることはなく、そこにハンダが付着してしまうという問題も発生しない。   In the printed wiring board 1 manufactured by the method for manufacturing a printed wiring board according to the present invention having the above-described configuration, a sufficiently thick solder resist 6 film is formed on the edge portion 7 of the circuit conductor 3. Therefore, the circuit conductor 3 other than the portion of the circuit conductor 3 of the printed wiring board 1 to be soldered with the lead part of the component is not exposed, and the problem that the solder adheres to the circuit conductor 3 does not occur.

本発明に係るプリント配線板の製造方法により製造されるプリント配線板1は以下のような工程を経て製造することができる。
1)まず、図2(a)に示したように、回路導体3を構成するための金属箔4(銅などの金属材料)を絶縁板2(ベークライト、エポキシ樹脂など電気を通さない材料)に接着する。
The printed wiring board 1 manufactured by the method for manufacturing a printed wiring board according to the present invention can be manufactured through the following steps.
1) First, as shown in FIG. 2A, a metal foil 4 (metal material such as copper) for constituting the circuit conductor 3 is applied to an insulating plate 2 (material that does not conduct electricity such as bakelite and epoxy resin). Glue.

2)次に、図2(b)に示したように、金属箔4の上面にフォトレジスト5を塗布し、所望の配線パターンが描かれたマスクを重ねて露光し、現像する。
3)次にフォトレジスト5に覆われていない金属箔4の面を塩化第二鉄溶液等のエッチング液でエッチングすると、図2(c)に示したように、所望の平面状のパターンを有する回路導体3が形成される。
2) Next, as shown in FIG. 2B, a photoresist 5 is applied to the upper surface of the metal foil 4, and a mask on which a desired wiring pattern is drawn is superimposed and exposed, and developed.
3) Next, when the surface of the metal foil 4 not covered with the photoresist 5 is etched with an etching solution such as ferric chloride solution, a desired planar pattern is obtained as shown in FIG. A circuit conductor 3 is formed.

4)この状態では、回路導体3のエッヂ部7が尖った状態となっているため(拡大した状態は図4(b)を参照)、エッチングによりエッヂ部7に丸みをつける工程を設ける。
これを行なうためには、2)の工程により形成されたフォトレジスト5を除去し、再度、プリント配線板1の全面にフォトレジスト5´を塗布し、回路導体3のエッヂ部7がはみ出るようなパターンが描かれたマスクを重ねて露光し、現像する。これにより、図2(d)に示したように、回路導体3のエッヂ部7以外の回路導体3の上面がフォトレジスト5´に覆われ、レジストパターンが形成されることになる。
4) In this state, the edge portion 7 of the circuit conductor 3 is pointed (see FIG. 4B for an enlarged state), and therefore a step of rounding the edge portion 7 by etching is provided.
In order to do this, the photoresist 5 formed in the step 2) is removed, the photoresist 5 'is applied again on the entire surface of the printed wiring board 1, and the edge portion 7 of the circuit conductor 3 protrudes. A mask on which a pattern is drawn is superimposed and exposed and developed. As a result, as shown in FIG. 2D, the upper surface of the circuit conductor 3 other than the edge portion 7 of the circuit conductor 3 is covered with the photoresist 5 ', and a resist pattern is formed.

図2(d)に示した状態で、例えば3)の工程と同じエッチング液を用いて、回路導体3のエッチングを短時間のうちに行なう。なお、エッチング時間は、所望するエッヂ部7の丸みの半径により異なる。エッチング時間が短時間であると、回路導体3の幅を大幅に減少させることなく、図2(e)に示したように、回路導体3のエッヂ部7の尖った形状が丸みを帯びるようになる。またこのように、エッチングのみの簡単な工程で回路導体3のエッヂ部7に容易に丸みを形成することができる。エッチング終了後、フォトレジスト5´を除去する。   In the state shown in FIG. 2D, the circuit conductor 3 is etched in a short time using the same etching solution as in the step 3), for example. Note that the etching time varies depending on the desired radius of the edge portion 7. If the etching time is short, the sharp shape of the edge portion 7 of the circuit conductor 3 is rounded as shown in FIG. 2E without significantly reducing the width of the circuit conductor 3. Become. Further, as described above, the edge portion 7 of the circuit conductor 3 can be easily rounded by a simple process only by etching. After the etching is completed, the photoresist 5 ′ is removed.

5)最後に、プリント配線板1の全面に液状のフォトソルダーレジストを塗布し、フォトマスクを介して露光した後にフォトソルダーレジストを現像し、次いでこのフォトソルダーレジストを硬化させることにより、図2(f)に示したように、部品のリード部とハンダ付けをするプリント配線板1の回路導体3の箇所以外のプリント配線板1の面にソルダーレジスト6の被膜が形成される。 5) Finally, a liquid photo solder resist is applied to the entire surface of the printed wiring board 1, exposed through a photo mask, developed, and then the photo solder resist is cured to obtain FIG. As shown in f), a film of the solder resist 6 is formed on the surface of the printed wiring board 1 other than the location of the circuit conductor 3 of the printed wiring board 1 to be soldered with the lead part of the component.

このようにして製造されたプリント配線板1は、回路導体3のエッヂ部7において十分な厚さのソルダーレジスト6の被膜が形成される。そのため、部品のリード部とハンダ付けをするプリント配線板1の回路導体3の箇所以外の回路導体3がむき出しになることはなく、そこにハンダが付着してしまうという問題も発生しない。また、かかるプリント配線板1は回路導体3の電気絶縁性が良好で、製品としてのプリント配線板の信頼性が高く大電流用途に適する。   In the printed wiring board 1 manufactured in this way, a film of the solder resist 6 having a sufficient thickness is formed at the edge portion 7 of the circuit conductor 3. Therefore, the circuit conductor 3 other than the portion of the circuit conductor 3 of the printed wiring board 1 to be soldered with the lead portion of the component is not exposed, and the problem that the solder adheres there does not occur. Further, the printed wiring board 1 has good electrical insulation of the circuit conductor 3, and the printed wiring board as a product has high reliability and is suitable for large current applications.

本発明に係るプリント配線板の製造方法により製造されるソルダーレジストが被膜されたプリント配線板の断面図。Sectional drawing of the printed wiring board by which the soldering resist manufactured by the manufacturing method of the printed wiring board which concerns on this invention was coated. (a)〜(f)は本発明に係るプリント配線板の製造方法により製造されるソルダーレジストが被膜されたプリント配線板を製造するための工程を示す説明図。(A)-(f) is explanatory drawing which shows the process for manufacturing the printed wiring board by which the soldering resist manufactured by the manufacturing method of the printed wiring board which concerns on this invention was coated. (a)〜(e)は従来技術に係るソルダーレジストが被膜されたプリント配線板を製造するための工程を示す説明図。(A)-(e) is explanatory drawing which shows the process for manufacturing the printed wiring board by which the soldering resist which concerns on a prior art was coated. (a)、(b)は共に従来技術に係るプリント配線板の断面図である。(A), (b) is sectional drawing of the printed wiring board based on a prior art both. (a)〜(c)は従来技術に係るソルダーレジストが被膜されたプリント配線板を製造するための工程を示す説明図。(A)-(c) is explanatory drawing which shows the process for manufacturing the printed wiring board by which the soldering resist which concerns on a prior art was coated.

符号の説明Explanation of symbols

1 プリント配線板
2 絶縁板
3 回路導体
4 金属箔
5 フォトレジスト
6 ソルダーレジスト
7 エッヂ部
8 樹脂
DESCRIPTION OF SYMBOLS 1 Printed wiring board 2 Insulation board 3 Circuit conductor 4 Metal foil 5 Photoresist 6 Solder resist 7 Edge part 8 Resin

Claims (1)

絶縁板上に形成した回路導体にソルダーレジストが被膜されたプリント配線板の製造方法において、前記回路導体の厚さが120μm以上であり、絶縁板上に接着した金属箔の上面にフォトレジストを塗布し、所望のパターンが描かれたマスクを重ねて現像し、エッチングして該絶縁板上に前記回路導体を形成した後、前記フォトレジストを除去するとともに、再度フォトレジストを塗布し、前記回路導体のエッヂ部がはみ出るようなパターンが描かれたマスクを重ねて現像し、前記エッヂ部以外の前記回路導体上面のみが前記フォトレジストに覆われたレジストパターンを形成し、しかる後、前記回路導体をエッチングして、前記回路導体のエッヂ部に丸みを形成する工程を少なくとも含むことを特徴とするプリント配線板の製造方法。 In a method of manufacturing a printed wiring board in which a solder resist is coated on a circuit conductor formed on an insulating plate, the thickness of the circuit conductor is 120 μm or more, and a photoresist is applied to the upper surface of a metal foil adhered on the insulating plate Then, after developing a mask on which a desired pattern is drawn and developing, etching to form the circuit conductor on the insulating plate, the photoresist is removed, and a photoresist is applied again, and the circuit conductor is applied. A mask on which a pattern in which the edge portion protrudes is overlaid and developed to form a resist pattern in which only the upper surface of the circuit conductor other than the edge portion is covered with the photoresist, and then the circuit conductor is A method for manufacturing a printed wiring board, comprising: at least a step of etching to form a roundness in an edge portion of the circuit conductor.
JP2003426110A 2003-12-24 2003-12-24 Method for manufacturing printed wiring board Expired - Fee Related JP4391223B2 (en)

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JP2003426110A JP4391223B2 (en) 2003-12-24 2003-12-24 Method for manufacturing printed wiring board

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JP2003426110A JP4391223B2 (en) 2003-12-24 2003-12-24 Method for manufacturing printed wiring board

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JP2005183861A JP2005183861A (en) 2005-07-07
JP4391223B2 true JP4391223B2 (en) 2009-12-24

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Publication number Priority date Publication date Assignee Title
JP4676411B2 (en) * 2006-10-12 2011-04-27 古河電気工業株式会社 Method for manufacturing printed wiring board
JP5298347B2 (en) * 2009-05-18 2013-09-25 株式会社フジクラ Printed wiring board and manufacturing method thereof

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