JP2016178202A - Junction structure for circuit board and electronic component, electronic circuit board, and manufacturing method of circuit board - Google Patents

Junction structure for circuit board and electronic component, electronic circuit board, and manufacturing method of circuit board Download PDF

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JP2016178202A
JP2016178202A JP2015057258A JP2015057258A JP2016178202A JP 2016178202 A JP2016178202 A JP 2016178202A JP 2015057258 A JP2015057258 A JP 2015057258A JP 2015057258 A JP2015057258 A JP 2015057258A JP 2016178202 A JP2016178202 A JP 2016178202A
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groove
electronic component
circuit board
circuit conductor
circuit
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JP6498974B2 (en
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浩一 横山
Koichi Yokoyama
浩一 横山
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Furukawa Electric Co Ltd
Furukawa Automotive Systems Inc
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Furukawa Electric Co Ltd
Furukawa Automotive Systems Inc
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Abstract

PROBLEM TO BE SOLVED: To provide a junction structure or the like for a circuit board and an electronic component which improves manufacturability and improves junction reliability.SOLUTION: A groove 11 is formed in a circuit conductor exposure part 7. The groove 11 is formed from the side of an electronic component 3 substantially in parallel with a protruding direction of an electrode 13 that is formed by the side of the electronic component 3. In such a case, the groove 11 is formed with a substantially fixed width in a formation direction of the groove 11 (with a width in a direction vertical to the formation direction). The groove 11 is also prevented from crossing a groove in the other direction. Namely, the groove 11 is formed only in the direction that is substantially parallel to the protruding direction of the electrode 13 that is formed by the side of the electronic component 3, and prevented from crossing the other groove that is formed in the other direction. When the electronic component 3 is disposed on the circuit conductor exposure part 7, the electrode 13 of the electronic component 3 is disposed on the groove 11. The electrode 13 and the circuit conductor exposure part 7 are joined by a solder 15 in such a state, thereby packaging the electronic component 3.SELECTED DRAWING: Figure 3

Description

本発明は、回路導体と絶縁体とが一体成形された回路基板と電子部品との接合構造等に関するものである。   The present invention relates to a joining structure of a circuit board and an electronic component, in which a circuit conductor and an insulator are integrally formed, and the like.

プリント配線基板などに電子部品を実装する際には、電子部品の電極や端子とプリント配線基板のパッドとを半田で接合するのが一般的である。この際、半田の接合信頼性を高めるため、余剰半田のはみだし等を防止する必要がある。   When mounting an electronic component on a printed wiring board or the like, it is common to bond the electrodes and terminals of the electronic component and the pads of the printed wiring board with solder. At this time, in order to improve the solder joint reliability, it is necessary to prevent the excess solder from protruding.

この方法として、例えば、プリント配線基板に形成される電子部品実装用のパッド表面に、突出部を設ける方法が提案されている(特許文献1)。   As this method, for example, a method of providing a protrusion on the surface of a pad for mounting an electronic component formed on a printed wiring board has been proposed (Patent Document 1).

また、金属導体であるコネクタ端子と電子部品の接合面に、格子状または放射状の細溝を設ける方法が提案されている(特許文献2)。   Further, a method has been proposed in which a grid-like or radial narrow groove is provided on a joint surface between a connector terminal, which is a metal conductor, and an electronic component (Patent Document 2).

特開平4−346291号公報JP-A-4-346291 特開平9−27675号公報JP-A-9-27675

しかし、特許文献1のようにパッド部分に突起を形成すると、実装される電子部品の電極等が突起上に斜めになって乗り上げた状態となり得る。このように電子部品が斜めに接合されると、実装品質を低下させることとなる。   However, when a protrusion is formed on the pad portion as in Patent Document 1, an electrode of an electronic component to be mounted or the like may be inclined on the protrusion. When the electronic components are joined obliquely in this way, the mounting quality is degraded.

また、特許文献2のようにパッド部分に微細な溝を格子状または放射状に形成すると、実装される電子部品の位置によって、電極等と交差する溝数が変わる恐れがある。このため、電子部品の左右で、電極等と接合される半田量が異なる場合がある。このようになると、半田の表面張力によって電子部品が持ち上げられる、いわゆるマンハッタン現象が生じる恐れがある。   In addition, when fine grooves are formed in a grid or radial pattern in the pad portion as in Patent Document 2, the number of grooves intersecting with electrodes or the like may change depending on the position of the electronic component to be mounted. For this reason, the amount of solder bonded to the electrode or the like may be different on the left and right of the electronic component. In such a case, there is a risk of a so-called Manhattan phenomenon in which the electronic component is lifted by the surface tension of the solder.

一方、基板に実装される電子部品のうち、高電圧・大電流が負荷される部品については、それぞれのパーツを別々に製造後、それらを基板の外部に接続する必要がある。しかし、このような構成は、装置の大型化や組付け性不良を招く。これに対し、プレスにより複数の回路素材を成形し、回路素材を接合した状態で、射出成形等によって基板を一体成形する方法がある。射出成形基板を用いることで、高電圧・大電流に耐えうる回路をプレスによって成形することができる。   On the other hand, among the electronic components mounted on the board, it is necessary to connect the parts that are loaded with a high voltage and a large current to the outside of the board after each part is manufactured separately. However, such a configuration leads to an increase in the size of the device and a poor assembly. On the other hand, there is a method in which a plurality of circuit materials are formed by pressing and the substrate is integrally formed by injection molding or the like in a state where the circuit materials are joined. By using an injection-molded substrate, a circuit that can withstand high voltage and large current can be molded by pressing.

しかし、一般的に、プレスによる加工精度は、板厚の半分程度までであり、特許文献1や特許文献2のような微細な構造をプレス加工で製造される射出成形基板に適用することは困難である。また、突起や溝が大型化すればするほど、前述した電子部品の乗り上げやマンハッタン現象の可能性が高くなる。しかし、プレス加工後に、レーザ加工などで微細な溝加工などを施すためには、製造コストが増加する。   However, generally, the processing accuracy by pressing is up to about half of the plate thickness, and it is difficult to apply a fine structure such as Patent Document 1 and Patent Document 2 to an injection-molded substrate manufactured by pressing. It is. In addition, the larger the protrusion and the groove, the higher the possibility of the above-described electronic component riding and the Manhattan phenomenon. However, in order to perform fine groove processing by laser processing or the like after press processing, the manufacturing cost increases.

本発明は、このような問題に鑑みてなされたもので、製造性に優れ、接合信頼性に優れた回路基板と電子部品との接合構造等を提供することを目的とする。   The present invention has been made in view of such problems, and an object of the present invention is to provide a bonding structure between a circuit board and an electronic component that is excellent in manufacturability and excellent in bonding reliability.

前述した目的を達するために第1の発明は、回路導体と前記回路導体を覆うように形成された絶縁体とが一体化した回路基板と電子部品との接合構造であって、前記回路基板は、前記回路導体の一部が表面に露出する回路導体露出部を具備し、前記回路導体露出部には、溝が形成され、前記電子部品の端子または電極が、前記溝の上部に接合され、前記溝の幅が前記溝の形成方向に対して略一定であることを特徴とする回路基板と電子部品との接合構造である。   In order to achieve the above-mentioned object, a first invention is a junction structure of a circuit board and an electronic component, in which a circuit conductor and an insulator formed so as to cover the circuit conductor are integrated, and the circuit board includes: A circuit conductor exposed portion in which a part of the circuit conductor is exposed on the surface, the circuit conductor exposed portion is formed with a groove, and a terminal or an electrode of the electronic component is joined to the upper portion of the groove, The circuit board and electronic component joining structure is characterized in that the width of the groove is substantially constant with respect to the groove forming direction.

前記電子部品は、前記電子部品の本体を挟んで対向する位置のそれぞれに一つ以上の端子または電極を備え、前記回路導体露出部には、それぞれの前記端子または電極に対応してそれぞれ形成された溝を有し、対向するそれぞれの前記溝の幅は互いに同じ略一定の幅を有してもよい。   The electronic component includes one or more terminals or electrodes at positions facing each other across the body of the electronic component, and the circuit conductor exposed portion is formed corresponding to each of the terminals or electrodes. The width of each of the grooves facing each other may have the same substantially constant width.

前記溝は、前記電子部品側から前記端子または前記電極の突出方向に対して略平行な方向にのみ形成され、他の方向に形成される他の溝と交差しないことが望ましい。   It is desirable that the groove is formed only in a direction substantially parallel to the protruding direction of the terminal or the electrode from the electronic component side and does not intersect with another groove formed in another direction.

前記電子部品側から前記端子または前記電極の突出方向に垂直な方向に対する、前記回路導体露出部の幅をA、前記溝の幅をB、前記端子又は前記電極の幅をCとすると、
B<C<Aを満たし、かつ、
前記回路導体露出部の端部から前記溝の縁部までの距離が、(A−C)以上であることが望ましい。
With respect to a direction perpendicular to the protruding direction of the terminal or the electrode from the electronic component side, the width of the exposed portion of the circuit conductor is A, the width of the groove is B, and the width of the terminal or the electrode is C.
B <C <A is satisfied, and
It is desirable that a distance from an end portion of the circuit conductor exposed portion to an edge portion of the groove is (AC) or more.

前記電子部品側から前記端子または前記電極の突出方向に対する、前記溝の長さをD、前記端子又は前記電極の長さをEとすると、E<Dを満たすことが望ましい。   It is desirable that E <D is satisfied, where D is the length of the groove and E is the length of the terminal or the electrode with respect to the protruding direction of the terminal or the electrode from the electronic component side.

前記溝は、長さ方向および幅方向の全方向が前記回路導体または前記絶縁体で塞がれ、上方にのみ開口してもよい。   The groove may be closed only in the length direction and the width direction with the circuit conductor or the insulator and open only upward.

一対の前記回路導体露出部が対向して配置され、前記電子部品の下部であって一対の前記回路導体露出部同士の間には空間が形成され、前記溝の前記空間側が前記絶縁体で塞がれていてもよい。   A pair of exposed circuit conductors are arranged to face each other, a space is formed between the pair of exposed circuit conductors below the electronic component, and the space side of the groove is closed with the insulator. It may be removed.

第1の発明によれば、プレス加工で溝が形成されるため、回路導体の加工と同時に溝を形成することができる。このため、別途溝加工を行う必要がない。また、溝の幅が略一定であるため、対向する各端子または電極に対して、半田の量を均一にすることができる。   According to the first invention, since the groove is formed by pressing, the groove can be formed simultaneously with the processing of the circuit conductor. For this reason, it is not necessary to perform groove processing separately. Moreover, since the width of the groove is substantially constant, the amount of solder can be made uniform for each terminal or electrode facing each other.

また、対向するそれぞれの左右の溝の幅を互いに同じ略一定の幅とすることで、左右の電極等につく半田の量を同程度にすることができ、マンハッタン現象を防止することができる。   Further, by making the widths of the left and right grooves facing each other the same substantially constant width, the amount of solder attached to the left and right electrodes and the like can be made comparable, and the Manhattan phenomenon can be prevented.

この際、溝は、電子部品側から端子または電極の突出方向に対して略平行な方向にのみ形成され、他の方向に形成される他の溝と交差しないようにすることで、確実に、溝の幅を略一定にすることができる。   At this time, the groove is formed only in a direction substantially parallel to the protruding direction of the terminal or the electrode from the electronic component side, and by ensuring that it does not intersect with other grooves formed in other directions, The width of the groove can be made substantially constant.

また、回路導体露出部の幅をA、溝の幅をB、端子又は電極の幅をCとしたときに、B<C<Aを満たすことで、端子又は電極を確実に回路導体露出部に配置することができる。また、回路導体露出部の端部から溝の縁部までの距離が、(A−C)以上であれば、端子又は電極を、確実に溝上に配置することができる。   In addition, when the width of the circuit conductor exposed portion is A, the width of the groove is B, and the width of the terminal or electrode is C, by satisfying B <C <A, the terminal or the electrode can be reliably connected to the circuit conductor exposed portion. Can be arranged. Moreover, if the distance from the edge part of a circuit conductor exposure part to the edge of a groove | channel is more than (AC), a terminal or an electrode can be reliably arrange | positioned on a groove | channel.

また、溝の長さをD、端子又は電極の長さをEとしたとき、E<Dを満たせば、端子又は電極を、確実に溝上に配置することができ、回路導体露出部に対して、端子又は電極の位置がずれても、半田の量を一定にすることができる。   Moreover, when the length of the groove is D and the length of the terminal or electrode is E, if E <D is satisfied, the terminal or the electrode can be surely arranged on the groove, and the circuit conductor exposed portion is Even if the position of the terminal or the electrode is shifted, the amount of solder can be made constant.

また、溝の長さ方向および幅方向の全方向が回路導体または絶縁体で塞がれ、上方にのみ開口すれば、半田が溝から流れ出すことを防止することができる。   Further, if all the lengthwise and widthwise directions of the groove are closed with a circuit conductor or an insulator and opened only upward, it is possible to prevent the solder from flowing out of the groove.

また、電子部品の下部に空間が形成され、溝の空間側を絶縁体で塞ぐことで、溝からの半田の流出を抑えるとともに、電子部品下部に放熱スペースを形成することができる。   Further, a space is formed in the lower part of the electronic component, and the space side of the groove is closed with an insulator, so that the outflow of solder from the groove can be suppressed and a heat radiation space can be formed in the lower part of the electronic component.

第2の発明は、回路基板と電子部品との接合構造を具備することを特徴とする電子回路基板である。   According to a second aspect of the present invention, there is provided an electronic circuit board comprising a joint structure between a circuit board and an electronic component.

第2の発明よれば、信頼性の高い電子回路基板を得ることができる。   According to the second invention, a highly reliable electronic circuit board can be obtained.

第3の発明は、回路導体と前記回路導体を覆うように形成された絶縁体とが一体化した回路基板の製造方法であって、前記回路導体を回路素材から形成すると同時に、前記回路導体の表面の一部に、形成方向に対して幅が略一定であるように溝を形成し、前記回路導体を絶縁体で覆うと共に、前記溝を含む前記回路導体の一部が表面に露出するように、回路導体露出部を形成し、前記回路導体露出部の前記溝の上部に電子部品の端子または電極を接合することを特徴とする回路基板の製造方法である。   A third invention is a method of manufacturing a circuit board in which a circuit conductor and an insulator formed so as to cover the circuit conductor are integrated, and at the same time the circuit conductor is formed from a circuit material, A groove is formed in a part of the surface so that the width is substantially constant with respect to the forming direction, the circuit conductor is covered with an insulator, and a part of the circuit conductor including the groove is exposed on the surface. A circuit board exposed portion is formed, and a terminal or an electrode of an electronic component is joined to the upper portion of the groove of the circuit conductor exposed portion.

前記回路導体および前記溝は、プレス加工によって一括で形成されてもよい。   The circuit conductor and the groove may be collectively formed by pressing.

第3の発明によれば、回路導体の加工と同時に溝を形成することができる。このため、別途溝加工を行う必要がない。また、溝の幅が略一定であるため、対向する各端子または電極に対して、半田の量を均一にすることができる。   According to the third invention, the groove can be formed simultaneously with the processing of the circuit conductor. For this reason, it is not necessary to perform groove processing separately. Moreover, since the width of the groove is substantially constant, the amount of solder can be made uniform for each terminal or electrode facing each other.

特に、回路導体と溝とをプレス加工で形成すれば、加工が容易である。   In particular, if the circuit conductor and the groove are formed by pressing, the processing is easy.

本発明によれば、製造性に優れ、接合信頼性に優れた回路基板と電子部品との接合構造等を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, it is excellent in manufacturability and can provide the joining structure etc. of the circuit board and electronic component which were excellent in joining reliability.

回路基板1を示す平面図。The top view which shows the circuit board 1. FIG. 回路基板1の断面図であり、図1のZ−Z線断面図。FIG. 3 is a cross-sectional view of the circuit board 1 and is a cross-sectional view taken along the line ZZ in FIG. 1. (a)は、回路導体露出部7へ電子部品3を配置する前の状態を示す図、(b)は、回路導体露出部7へ電子部品3を配置した後の状態を示す図。(A) is a figure which shows the state before arrange | positioning the electronic component 3 to the circuit conductor exposed part 7, (b) is a figure which shows the state after arrange | positioning the electronic component 3 to the circuit conductor exposed part 7. FIG. (a)は、回路導体露出部7へ電子部品3aを配置する前の状態を示す図、(b)は、回路導体露出部7へ電子部品3aを配置した後の状態を示す図。(A) is a figure which shows the state before arrange | positioning the electronic component 3a to the circuit conductor exposed part 7, (b) is a figure which shows the state after arrange | positioning the electronic component 3a to the circuit conductor exposed part 7. FIG. (a)、(b)は、溝11の他の実施形態を示す図。(A), (b) is a figure which shows other embodiment of the groove | channel 11. FIG. 溝11の幅と、電極13の幅の関係を示す図。The figure which shows the relationship between the width | variety of the groove | channel 11, and the width | variety of the electrode 13. FIG. 溝11の長さと、電極13の長さ等の関係を示す図。The figure which shows the relationship of the length of the groove | channel 11, the length of the electrode 13, etc. FIG. (a)、(b)、(c)は、溝11の他の実施形態を示す図。(A), (b), (c) is a figure which shows other embodiment of the groove | channel 11. FIG.

以下、図面を参照しながら、本発明の実施形態について説明する。図1は、回路基板1を示す平面図であり、図2は、図1のZ−Z線断面図である。なお、図1においては、半田の図示を省略する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a plan view showing a circuit board 1, and FIG. 2 is a cross-sectional view taken along the line ZZ of FIG. In FIG. 1, illustration of solder is omitted.

回路基板1は、回路導体5の一部が絶縁体である樹脂9によって被覆される。また、回路導体5の一部は、樹脂9から露出する。樹脂9から露出する部位が、回路導体露出部7となる。なお、以下の説明では、絶縁体として樹脂の例を示すが、絶縁体であれば、例えばAlNなど樹脂以外も適用可能である。   The circuit board 1 is covered with a resin 9 having a part of the circuit conductor 5 as an insulator. A part of the circuit conductor 5 is exposed from the resin 9. The portion exposed from the resin 9 becomes the circuit conductor exposed portion 7. In the following description, an example of a resin is shown as an insulator, but an insulator other than a resin such as AlN is applicable.

回路導体5は、特に限定されないが、銅、銅合金、アルミニウム、アルミニウム合金などを適用することができる。また、回路導体5は、プレス加工によって形成される。   Although the circuit conductor 5 is not specifically limited, Copper, copper alloy, aluminum, aluminum alloy, etc. can be applied. The circuit conductor 5 is formed by pressing.

樹脂9は、特に限定されないが、例えばPPS(ポリフェニレンスルファイド)、PA(ポリアミド)、PBT(ポリブチレンテレフタレート)などを用いることができる。   The resin 9 is not particularly limited. For example, PPS (polyphenylene sulfide), PA (polyamide), PBT (polybutylene terephthalate), or the like can be used.

回路導体露出部7は、実装される電子部品3との接合部となる。回路導体露出部7は、電子部品3の電極13と半田で接合される。なお、電子部品3としては、例えば、抵抗、コンデンサ、インダクタ、ダイオード、トランジスタ、半導体集積回路などいずれでもよい。電子部品3の配置や、個数などは、図示した例には限られない。   The circuit conductor exposed portion 7 becomes a joint portion with the electronic component 3 to be mounted. The circuit conductor exposed portion 7 is joined to the electrode 13 of the electronic component 3 with solder. The electronic component 3 may be any of a resistor, a capacitor, an inductor, a diode, a transistor, a semiconductor integrated circuit, and the like. The arrangement and the number of electronic components 3 are not limited to the illustrated example.

次に、回路基板1の製造方法について説明する。まず、複数の回路導体5を成形する。回路導体5は、例えば、回路素材である金属板からプレス等で加工される。また、金属板の厚みは、例えば0.4mm〜3mm程度である。   Next, a method for manufacturing the circuit board 1 will be described. First, a plurality of circuit conductors 5 are formed. The circuit conductor 5 is processed by a press or the like from a metal plate that is a circuit material, for example. The thickness of the metal plate is, for example, about 0.4 mm to 3 mm.

金属板を所定の形状に打ち抜くと同時に、所定の場所に溝11を形成する。回路導体5と溝11とをプレス加工によって一括で形成することで、加工が容易に行える。溝11の詳細は後述する。このようにして、回路導体5を形成し、必要に応じて回路導体5同士を接合する。回路導体5同士の接合は例えば溶接により行われる。なお、回路導体5は1層のみではなく、複数層に層状に形成されてもよい。また、プレス加工以外の方法、例えばワイヤーカット放電加工によって回路導体5を成形しても良い。   At the same time as punching the metal plate into a predetermined shape, the groove 11 is formed at a predetermined location. By forming the circuit conductor 5 and the groove 11 together by pressing, the processing can be easily performed. Details of the groove 11 will be described later. In this way, the circuit conductor 5 is formed, and the circuit conductors 5 are joined together as necessary. The joining between the circuit conductors 5 is performed by welding, for example. Note that the circuit conductor 5 may be formed not only in one layer but also in a plurality of layers. Moreover, you may shape | mold the circuit conductor 5 by methods other than press work, for example, wire cut electric discharge machining.

得られた回路導体5を金型にセットし、樹脂9を金型内に射出することで、回路導体5の表面または層間が樹脂9によって被覆され、回路基板1が形成される。なお、射出成形以外の方法で樹脂9と回路導体5とを一体化してもよく、例えば、3Dプリンタにより樹脂を堆積させて樹脂9と回路導体5とを一体化してもよい。   The obtained circuit conductor 5 is set in a mold, and the resin 9 is injected into the mold, whereby the surface or interlayer of the circuit conductor 5 is covered with the resin 9 and the circuit board 1 is formed. The resin 9 and the circuit conductor 5 may be integrated by a method other than injection molding. For example, the resin 9 and the circuit conductor 5 may be integrated by depositing the resin with a 3D printer.

次に、回路基板1と電子部品3との接続構造について説明する。図3(a)に示すように、少なくとも一対の回路導体5が隙間をあけて、回路導体露出部7が互いに対向するように配置される。また、それぞれの回路導体露出部7には、1本の溝11が形成される。   Next, a connection structure between the circuit board 1 and the electronic component 3 will be described. As shown in FIG. 3A, at least a pair of circuit conductors 5 are arranged with a gap therebetween so that the circuit conductor exposed portions 7 face each other. Further, one groove 11 is formed in each circuit conductor exposed portion 7.

溝11は、電子部品3側から、電子部品3の側方に形成された電極13の突出方向(図中X方向)に対して略平行に形成される。なお、略平行とは、電子部品3の側方に形成された電極13の突出方向(図中X方向)と溝の形成方向とが±10°程度以内の誤差であることが望ましい。なお、回路導体露出部7の長さ(図中X方向)は、例えば1.6mm程度であり、幅(図中Xに垂直な方向)は0.8mm程度である。また、溝11の深さは例えば0.2〜0.8mm程度である。   The groove 11 is formed substantially parallel to the protruding direction (X direction in the drawing) of the electrode 13 formed on the side of the electronic component 3 from the electronic component 3 side. Note that “substantially parallel” is preferably an error within about ± 10 ° between the protruding direction (X direction in the drawing) of the electrode 13 formed on the side of the electronic component 3 and the groove forming direction. In addition, the length (X direction in the drawing) of the circuit conductor exposed portion 7 is, for example, about 1.6 mm, and the width (direction perpendicular to X in the drawing) is about 0.8 mm. Moreover, the depth of the groove | channel 11 is about 0.2-0.8 mm, for example.

なお、以下の説明では、電極13は、電子部品3に対して対向する位置にそれぞれ形成される例について説明するが、本発明はこれに限らない。例えば、図示したように、溝11が同一直線状に配置されてもよく、溝11の形成軸がずれていてもよい。また、電子部品3に対して対向する位置に複数の電極13が形成されてもよい。   In the following description, examples in which the electrodes 13 are formed at positions facing the electronic component 3 will be described, but the present invention is not limited to this. For example, as illustrated, the grooves 11 may be arranged in the same straight line, and the forming axis of the grooves 11 may be shifted. A plurality of electrodes 13 may be formed at positions facing the electronic component 3.

なお、溝11は、溝11の形成方向(図中X方向)に対して、略一定の幅(形成方向に垂直な方向の幅)で形成される。また、対向するそれぞれの溝11も、互いに略一定の幅(同一の幅)で形成される。なお、略一定の幅とは、溝11の形成方向に沿って、溝の幅の変化が、所定値±5%であることを指すものとする。また、溝11は、他の方向の溝と交差することもない。すなわち、溝11は、電子部品3の側方に形成された電極13の突出方向に略平行な方向にのみ形成され、他の方向に形成される他の溝と交差することはない。   The groove 11 is formed with a substantially constant width (width in a direction perpendicular to the forming direction) with respect to the forming direction of the groove 11 (X direction in the drawing). The opposing grooves 11 are also formed with a substantially constant width (the same width). Note that the substantially constant width indicates that the change in the width of the groove along the forming direction of the groove 11 is a predetermined value ± 5%. Moreover, the groove | channel 11 does not cross | intersect the groove | channel of another direction. That is, the groove 11 is formed only in a direction substantially parallel to the protruding direction of the electrode 13 formed on the side of the electronic component 3 and does not intersect with other grooves formed in other directions.

図3(b)に示すように、電子部品3を回路導体露出部7上に配置すると、電子部品3の電極13は、溝11上に配置される。この状態で、半田15によって電極13と回路導体露出部7を接合することで、電子部品3は実装される。なお、このように、電子部品3が回路導体露出部7上に接合された構造を、回路基板1と電子部品3との接合構造10とする。   As shown in FIG. 3B, when the electronic component 3 is disposed on the circuit conductor exposed portion 7, the electrode 13 of the electronic component 3 is disposed on the groove 11. In this state, the electronic component 3 is mounted by joining the electrode 13 and the circuit conductor exposed portion 7 with the solder 15. Note that a structure in which the electronic component 3 is bonded onto the circuit conductor exposed portion 7 in this way is referred to as a bonded structure 10 between the circuit board 1 and the electronic component 3.

回路基板1と電子部品3とを半田15で接合すると、余剰の半田15は、溝11内に流れる。したがって、余剰の半田15が回路基板1の上面にはみ出すことがない。   When the circuit board 1 and the electronic component 3 are joined with the solder 15, the excess solder 15 flows into the groove 11. Therefore, excessive solder 15 does not protrude from the upper surface of the circuit board 1.

なお、本発明では、図4(a)に示すように、両側方に端子13aが突出する電子部品3aに適用することもできる。この場合でも、溝11は、電子部品3a側から、電子部品3aの側方に形成された端子13aの突出方向(図中X方向)に対して略平行に形成される。   In addition, in this invention, as shown to Fig.4 (a), it can also apply to the electronic component 3a from which the terminal 13a protrudes on both sides. Even in this case, the groove 11 is formed substantially parallel to the protruding direction (X direction in the drawing) of the terminal 13a formed on the side of the electronic component 3a from the electronic component 3a side.

同様に、図4(b)に示すように、電子部品3aを回路導体露出部7上に配置すると、電子部品3aの端子13aは、溝11上に配置される。この状態で、半田15によって端子13aと回路導体露出部7を接合することで、電子部品3は実装される。このように、本発明は、電子部品の形態は問わず、電極13又は端子13aの突出方向に略平行な溝11が形成されればよい。   Similarly, as shown in FIG. 4B, when the electronic component 3 a is arranged on the circuit conductor exposed portion 7, the terminal 13 a of the electronic component 3 a is arranged on the groove 11. In this state, the electronic component 3 is mounted by joining the terminal 13 a and the circuit conductor exposed portion 7 with the solder 15. Thus, in the present invention, the form of the electronic component is not limited, and the groove 11 substantially parallel to the protruding direction of the electrode 13 or the terminal 13a may be formed.

なお、図3、図4に示す例では、対向する回路導体露出部7同士の間には空間が形成される。すなわち、電子部品3等の下部には、空間が形成される。このようにすることで、電子部品3等の放熱性を高めることができる。なお、回路導体露出部7同士の間には、図示した様な空間を形成せずに、樹脂9で埋めてもよい。   In the example shown in FIGS. 3 and 4, a space is formed between the exposed circuit conductor exposed portions 7. That is, a space is formed below the electronic component 3 and the like. By doing in this way, heat dissipation of the electronic component 3 etc. can be improved. The circuit conductor exposed portions 7 may be filled with the resin 9 without forming a space as illustrated.

ここで、図示した例では、溝11が回路導体露出部7の端部まで連続して形成され、対向する回路導体露出部7同士の間の空間に開口している。したがって、このようなに空間を形成する場合には、半田15が当該空間に流れ出す恐れがある。   Here, in the illustrated example, the groove 11 is continuously formed up to the end of the circuit conductor exposed portion 7 and opens into a space between the opposing circuit conductor exposed portions 7. Therefore, in the case where such a space is formed, the solder 15 may flow out into the space.

そこで、本発明では、当該空間を維持したまま溝11からの半田15の流れ出しを防止するため、図5(a)に示すように、溝11の端部(空間側の端部)を樹脂9で塞いでもよい。このようにすることで、溝11の長さ方向(形成方向)および幅方向(形成方向に垂直な方向)の全方向が回路導体5および樹脂9で塞がれ、上方にのみ開口することなる。このため、半田15が溝11から流れ出すことがない。   Therefore, in the present invention, in order to prevent the solder 15 from flowing out of the groove 11 while maintaining the space, as shown in FIG. 5A, the end of the groove 11 (the end on the space side) is made of resin 9. It may be closed with. By doing so, the entire direction of the groove 11 in the length direction (formation direction) and the width direction (direction perpendicular to the formation direction) is blocked by the circuit conductor 5 and the resin 9 and opens only upward. . For this reason, the solder 15 does not flow out of the groove 11.

また、図5(b)に示すように、溝11の端部(空間側の端部)を回路導体5自体で塞いでもよい。このようにすることで、溝11の長さ方向(形成方向)および幅方向(形成方向に垂直な方向)の全方向が回路導体5で塞がれ、上方にのみ開口することなる。このため、半田15が溝11から流れ出すことがない。   Further, as shown in FIG. 5B, the end of the groove 11 (the end on the space side) may be closed with the circuit conductor 5 itself. By doing so, the entire direction of the groove 11 in the length direction (formation direction) and the width direction (direction perpendicular to the formation direction) is blocked by the circuit conductor 5 and opens only upward. For this reason, the solder 15 does not flow out of the groove 11.

次に、溝11の形状の詳細について説明する。図6は、溝11と電極13(端子13a)の幅方向の断面図である。図示したように、電子部品側から電極13(端子13a)の突出方向に垂直な方向に対する、回路導体露出部7の幅をAとし、溝11の幅をBとし、電極13(端子13a)の幅をCとする。この場合、B<C<Aの関係を満たす。   Next, details of the shape of the groove 11 will be described. FIG. 6 is a cross-sectional view in the width direction of the groove 11 and the electrode 13 (terminal 13a). As shown in the figure, the width of the circuit conductor exposed portion 7 with respect to the direction perpendicular to the protruding direction of the electrode 13 (terminal 13a) from the electronic component side is A, the width of the groove 11 is B, and the electrode 13 (terminal 13a) Let C be the width. In this case, the relationship B <C <A is satisfied.

また、回路導体露出部7の両方の端部から溝11の縁部までのそれぞれの距離が、いずれも(A−C)以上の関係を満たす。このようにすることで、電極13(端子13a)が、回路導体露出部7の中心から幅方向にずれたとしても、確実に電極13(端子13a)を回路導体露出部7の溝11上に配置させることができる。また、この際、電極13(端子13a)が、溝11に落ち込むことがない。   Moreover, each distance from the both ends of the circuit conductor exposure part 7 to the edge of the groove | channel 11 satisfy | fills the relationship more than (AC) or more. By doing in this way, even if the electrode 13 (terminal 13a) is shifted in the width direction from the center of the circuit conductor exposed portion 7, the electrode 13 (terminal 13a) is securely placed on the groove 11 of the circuit conductor exposed portion 7. Can be placed. At this time, the electrode 13 (terminal 13a) does not fall into the groove 11.

図7は、溝11と電子部品3aの長さ方向の断面図である。なお、図では電子部品3aの例を示すが、電子部品3も同様である。図に示すように、溝11の長さをDとし、端子13aの長さをEとする。この場合、E<Dの関係を満たす。なお、溝11の端部が空間側に開口している場合には、溝11の長さDは、回路導体露出部7の端面までの距離とする。   FIG. 7 is a cross-sectional view of the groove 11 and the electronic component 3a in the length direction. In addition, although the figure shows the example of the electronic component 3a, the electronic component 3 is the same. As shown in the figure, the length of the groove 11 is D, and the length of the terminal 13a is E. In this case, the relationship E <D is satisfied. When the end portion of the groove 11 is open to the space side, the length D of the groove 11 is a distance to the end surface of the circuit conductor exposed portion 7.

このようにすることで、電極13(端子13a)が、回路導体露出部7の長さ方向にずれたとしても、確実に電極13(端子13a)を回路導体露出部7の溝11上に配置させることができる。   In this way, even if the electrode 13 (terminal 13a) is displaced in the length direction of the circuit conductor exposed portion 7, the electrode 13 (terminal 13a) is reliably disposed on the groove 11 of the circuit conductor exposed portion 7. Can be made.

なお、さらに望ましくは、端子13a間の長さをL1とし、溝11間の長さをL2とすると、L1≧L2、かつ、L1+E≦L2+Dが望ましい。このようにすると、電子部品3aを配置する際、一方の端子13aの基部が溝11の端部(溝11同士の対向側の端部)側へずれたとしても、対向する端子13aの先端が、溝11からずれることがない。   More preferably, when the length between the terminals 13a is L1 and the length between the grooves 11 is L2, L1 ≧ L2 and L1 + E ≦ L2 + D are desirable. In this way, when the electronic component 3a is disposed, even if the base portion of one terminal 13a is shifted to the end portion of the groove 11 (the end portion on the opposite side of the grooves 11), the tip of the opposing terminal 13a is , There is no deviation from the groove 11.

以上説明したように、本実施形態の回路基板1によれば、回路導体露出部7に溝11が形成される。このため、余剰な半田15が溝11内に流れるため、半田15が回路基板1の上面にはみ出すことがない。また、溝11は例えばプレス加工で形成可能なサイズであるため、回路導体5の切断加工と同時に一括して溝11を形成することができる。このため、製造性に優れる。   As described above, according to the circuit board 1 of the present embodiment, the groove 11 is formed in the circuit conductor exposed portion 7. For this reason, excess solder 15 flows into the groove 11, so that the solder 15 does not protrude from the upper surface of the circuit board 1. Moreover, since the groove | channel 11 is a size which can be formed by press work, for example, the groove | channel 11 can be formed collectively simultaneously with the cutting process of the circuit conductor 5. FIG. For this reason, it is excellent in manufacturability.

また、溝11は、電子部品3(3a)の側方に形成された電極13(端子13a)の突出方向に略平行な方向にのみ形成され、他の方向に形成される他の溝と交差することはない。このため、溝11上での電極13(端子13a)の位置によって、電極13(端子13a)と接触する溝11内の半田15の量が変化することがない。このため、溝11上で電極13(端子13a)の位置がずれても、前述したマンハッタン現象などが起こることがない。   Moreover, the groove | channel 11 is formed only in the direction substantially parallel to the protrusion direction of the electrode 13 (terminal 13a) formed in the side of the electronic component 3 (3a), and cross | intersects the other groove | channel formed in another direction. Never do. For this reason, the amount of the solder 15 in the groove 11 in contact with the electrode 13 (terminal 13a) does not change depending on the position of the electrode 13 (terminal 13a) on the groove 11. For this reason, even if the position of the electrode 13 (terminal 13a) is shifted on the groove 11, the aforementioned Manhattan phenomenon does not occur.

また、回路導体露出部7の幅をAとし、溝11の幅をBとし、電極13(端子13a)の幅をCとすると、B<C<Aの関係を満たし、かつ、回路導体露出部7の両方の端部から溝11の縁部までのそれぞれの距離が、いずれも(A−C)以上の関係を満たす。このため、電極13(端子13a)が確実に溝11上に配置されるとともに、電極13(端子13a)の位置が回路導体露出部7の中心からずれたとしても、溝11と電極13(端子13a)との幅方向のラップ長が変わることがない。   When the width of the circuit conductor exposed portion 7 is A, the width of the groove 11 is B, and the width of the electrode 13 (terminal 13a) is C, the relationship of B <C <A is satisfied and the circuit conductor exposed portion 7, the distances from both ends of the groove 7 to the edge of the groove 11 satisfy the relationship (AC) or more. Therefore, the electrode 13 (terminal 13a) is reliably disposed on the groove 11, and even if the position of the electrode 13 (terminal 13a) is shifted from the center of the circuit conductor exposed portion 7, the groove 11 and the electrode 13 (terminal) The wrap length in the width direction with 13a) does not change.

また、同様に、溝11の長さをDとし、端子13aの長さをEとすると、E<Dの関係を満たすため、電極13(端子13a)の位置が、回路導体露出部7の中心から長さ方向にずれたとしても、溝11と電極13(端子13a)との長さ方向のラップ長が変わることがない。このため、前述したマンハッタン現象などが起こることがない。   Similarly, when the length of the groove 11 is D and the length of the terminal 13a is E, the position of the electrode 13 (terminal 13a) is the center of the circuit conductor exposed portion 7 in order to satisfy the relationship E <D. Even if it deviates in the length direction, the wrap length in the length direction between the groove 11 and the electrode 13 (terminal 13a) does not change. For this reason, the aforementioned Manhattan phenomenon does not occur.

なお、溝11の断面形状は、略矩形の場合には限られない。例えば、図8(a)に示すように、円弧形状を有する溝11aとしてもよい。また、図8(b)に示すように、逆三角形状の溝11bとしてもよい。このように、上方に向かってテーパ状とすることで、溝の加工性が良い。この場合、溝11a、11bの幅は、開口部における幅で考えるものとする。また、図8(c)に示すように、複数本の溝11cを形成してもよい。このように、本発明では、溝は1本であってもよく、複数本であってもよい。この場合、複数本の溝の幅の合計が、溝の形成方向に沿って略一定であるのが好ましい。   The cross-sectional shape of the groove 11 is not limited to a substantially rectangular shape. For example, as shown to Fig.8 (a), it is good also as the groove | channel 11a which has circular arc shape. Moreover, as shown in FIG.8 (b), it is good also as the groove | channel 11b of an inverted triangle shape. In this way, by making the taper upward, the workability of the groove is good. In this case, the width of the grooves 11a and 11b is considered as the width at the opening. Further, as shown in FIG. 8C, a plurality of grooves 11c may be formed. Thus, in the present invention, there may be one groove or a plurality of grooves. In this case, it is preferable that the total width of the plurality of grooves is substantially constant along the groove forming direction.

以上、添付図を参照しながら、本発明の実施の形態を説明したが、本発明の技術的範囲は、前述した実施の形態に左右されない。当業者であれば、特許請求の範囲に記載された技術的思想の範疇内において各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。   As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1………回路基板
3、3a………電子部品
5………回路導体
7………回路導体露出部
9………樹脂
10………接合構造
11、11a、11b、11c………溝
13………電極
13a………端子
15………半田
DESCRIPTION OF SYMBOLS 1 ......... Circuit board 3, 3a ......... Electronic component 5 ......... Circuit conductor 7 ......... Circuit conductor exposure part 9 ......... Resin 10 ...... Junction structure 11, 11a, 11b, 11c ......... Groove 13 ......... Electrode 13a ......... Terminal 15 ......... Solder

Claims (10)

回路導体と前記回路導体を覆うように形成された絶縁体とが一体化した回路基板と電子部品との接合構造であって、
前記回路基板は、前記回路導体の一部が表面に露出する回路導体露出部を具備し、
前記回路導体露出部には、溝が形成され、前記電子部品の端子または電極が、前記溝の上部に接合され、
前記溝の幅が前記溝の形成方向に対して略一定であることを特徴とする回路基板と電子部品との接合構造。
A circuit board integrated with a circuit conductor and an insulator formed so as to cover the circuit conductor, and a joint structure between the electronic component,
The circuit board comprises a circuit conductor exposed portion in which a part of the circuit conductor is exposed on the surface,
In the circuit conductor exposed portion, a groove is formed, and a terminal or an electrode of the electronic component is joined to the upper portion of the groove,
The circuit board and electronic component joining structure, wherein a width of the groove is substantially constant with respect to a forming direction of the groove.
前記電子部品は、前記電子部品の本体を挟んで対向する位置のそれぞれに一つ以上の端子または電極を備え、
前記回路導体露出部には、それぞれの前記端子または電極に対応してそれぞれ形成された溝を有し、対向するそれぞれの前記溝の幅は互いに同じ略一定の幅を有することを特徴とする請求項1に記載の回路基板と電子部品との接合構造。
The electronic component comprises one or more terminals or electrodes at each of the positions facing each other across the body of the electronic component,
The circuit conductor exposed portion has grooves formed corresponding to the terminals or electrodes, respectively, and the widths of the facing grooves have substantially the same constant width. Item 2. A junction structure between the circuit board according to Item 1 and an electronic component.
前記溝は、前記電子部品側から前記端子または前記電極の突出方向に対して略平行な方向にのみ形成され、他の方向に形成される他の溝と交差しないことを特徴とする請求項1または請求項2に記載の回路基板と電子部品との接合構造。   2. The groove is formed only in a direction substantially parallel to a protruding direction of the terminal or the electrode from the electronic component side, and does not intersect with another groove formed in another direction. Or the junction structure of the circuit board of Claim 2, and an electronic component. 前記電子部品側から前記端子または前記電極の突出方向に垂直な方向に対する、前記回路導体露出部の幅をA、前記溝の幅をB、前記端子又は前記電極の幅をCとすると、
B<C<Aを満たし、かつ、
前記回路導体露出部の端部から前記溝の縁部までの距離が、(A−C)以上であることを特徴とする請求項1から請求項3のいずれかに記載の回路基板と電子部品との接合構造。
With respect to a direction perpendicular to the protruding direction of the terminal or the electrode from the electronic component side, the width of the exposed portion of the circuit conductor is A, the width of the groove is B, and the width of the terminal or the electrode is C.
B <C <A is satisfied, and
4. The circuit board and electronic component according to claim 1, wherein a distance from an end of the circuit conductor exposed portion to an edge of the groove is (AC) or more. 5. Bonding structure with.
前記電子部品側から前記端子または前記電極の突出方向に対する、前記溝の長さをD、前記端子又は前記電極の長さをEとすると、
E<Dを満たすことを特徴とする請求項1から請求項4のいずれかに記載の回路基板と電子部品との接合構造。
When the length of the groove with respect to the protruding direction of the terminal or the electrode from the electronic component side is D, and the length of the terminal or the electrode is E,
The circuit board and electronic component joining structure according to claim 1, wherein E <D is satisfied.
前記溝は、長さ方向および幅方向の全方向が前記回路導体または前記絶縁体で塞がれ、上方にのみ開口していること特徴とする請求項1から請求項5のいずれかに記載の回路基板と電子部品との接合構造。   6. The groove according to claim 1, wherein all of the length direction and the width direction are closed by the circuit conductor or the insulator and are opened only upward. Bonding structure between circuit board and electronic components. 一対の前記回路導体露出部が対向して配置され、前記電子部品の下部であって一対の前記回路導体露出部同士の間には空間が形成され、前記溝の前記空間側が前記絶縁体で塞がれていること特徴とする請求項6に記載の回路基板と電子部品との接合構造。   A pair of exposed circuit conductors are arranged to face each other, a space is formed between the pair of exposed circuit conductors below the electronic component, and the space side of the groove is closed with the insulator. The joint structure between the circuit board and the electronic component according to claim 6, wherein the circuit board and the electronic component are joined. 請求項1から請求項7のいずれかに記載の回路基板と電子部品との接合構造を具備することを特徴とする電子回路基板。   8. An electronic circuit board comprising a junction structure between the circuit board according to claim 1 and an electronic component. 回路導体と前記回路導体を覆うように形成された絶縁体とが一体化した回路基板の製造方法であって、
前記回路導体を回路素材から形成すると同時に、前記回路導体の表面の一部に、形成方向に対して幅が略一定であるように溝を形成し、
前記回路導体を絶縁体で覆うと共に、前記溝を含む前記回路導体の一部が表面に露出するように、回路導体露出部を形成し、
前記回路導体露出部の前記溝の上部に電子部品の端子または電極を接合することを特徴とする回路基板の製造方法。
A method of manufacturing a circuit board in which a circuit conductor and an insulator formed so as to cover the circuit conductor are integrated,
At the same time as forming the circuit conductor from a circuit material, a groove is formed in a part of the surface of the circuit conductor so that the width is substantially constant with respect to the forming direction,
Covering the circuit conductor with an insulator and forming a circuit conductor exposed portion so that a part of the circuit conductor including the groove is exposed on the surface,
A method of manufacturing a circuit board, comprising bonding a terminal or an electrode of an electronic component to an upper portion of the groove of the circuit conductor exposed portion.
前記回路導体および前記溝は、プレス加工によって一括で形成されることを特徴とする請求項9記載の回路基板の製造方法。   The method for manufacturing a circuit board according to claim 9, wherein the circuit conductor and the groove are collectively formed by pressing.
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JPH02148884A (en) * 1988-11-30 1990-06-07 Taiyo Yuden Co Ltd Electronic component mounting land and formation thereof
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JP2000286289A (en) * 1999-03-31 2000-10-13 Fujitsu Ten Ltd Board laminated with metal, and semiconductor device
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