JP2020082117A - Solder composition for laser soldering, and solder joint part - Google Patents

Solder composition for laser soldering, and solder joint part Download PDF

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JP2020082117A
JP2020082117A JP2018218157A JP2018218157A JP2020082117A JP 2020082117 A JP2020082117 A JP 2020082117A JP 2018218157 A JP2018218157 A JP 2018218157A JP 2018218157 A JP2018218157 A JP 2018218157A JP 2020082117 A JP2020082117 A JP 2020082117A
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solder
solder composition
soldering
composition
laser
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西村 哲郎
Tetsuro Nishimura
哲郎 西村
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Nihon Superior Sha Co Ltd
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Abstract

To provide a solder composition for laser soldering and a solder joint part which do not generate flux scattering or the like, and which eliminate the use of flux also in soldering.SOLUTION: In laser soldering, a solder composition is used having a contour covered with an oxide of the solder composition or an oxide mainly containing the solder composition. The solder composition is irradiated with a laser beam to be instantaneously heated, so that an internal part of the solder composition expands first. Consequently, the non-oxidized solder composition in the internal part breaks through an oxide layer of the contour and contacts a joint surface, so that wetting of the solder composition advances smoothly, thereby realizing soldering without using flux. Since flux is not used in the solder composition applied, flux scattering does not occur.SELECTED DRAWING: None

Description

本発明は、レーザー光を使用して電子機器等のはんだ付けに用いるはんだ組成物、及び当該はんだを用いたはんだ接合部に関する。 The present invention relates to a solder composition used for soldering an electronic device or the like using laser light, and a solder joint part using the solder.

従来、電子部品等の接合方法に於いて、ディップはんだ付けやはんだペーストを使用したリフロー方式、そして、やに入りはんだを使用したはんだこてによる方式が用いられている。
しかし、近年、電子製品等のダウンサイジングが進み、電子部品やプリント配線基板等の微細化も進み、従来のディップはんだ付け等でははんだ付けが困難になってきている。
そこで、従来のはんだ付け方法でははんだ付けが困難な微細部品や微細な部位へのはんだ付けを行う方法として、レーザー光によるはんだ付け方法が提案されている。
このレーザー光を用いたはんだ付け方法は、はんだ付け装置より接合個所であるプリント配線基板向けレーザー光を照射して、照射されたレーザー光がはんだを溶融してはんだ付けを行う方法である。
この方法のメリットとして、微細な部分に電子部品を短時間ではんだ付けができることに加え、部分的な加熱によるはんだ付けが可能なため、他の電子部品やプリント配線基板等にダメージを与えることがない。
しかし、レーザー光によるはんだ付け方法の問題点として、はんだ材に対して急速な加熱により、フラックス飛散の発生やはんだボールの発生が課題となっている。
その為、レーザー光を用いたはんだ付けの課題に対して、種々の技術が開示されている。
2. Description of the Related Art Conventionally, as a method of joining electronic components, a reflow method using dip soldering or a solder paste, and a method using a soldering iron using a flux cored solder have been used.
However, in recent years, downsizing of electronic products and the like has progressed, electronic components and printed wiring boards, etc. have also become finer, and it has become difficult to perform soldering by conventional dip soldering or the like.
Therefore, a soldering method using laser light has been proposed as a method of soldering to a fine component or a fine portion that is difficult to solder by the conventional soldering method.
This soldering method using laser light is a method in which laser light for a printed wiring board, which is a joining point, is irradiated from a soldering device, and the irradiated laser light melts the solder to perform soldering.
As an advantage of this method, in addition to being able to solder electronic parts to minute parts in a short time, it is possible to solder by partial heating, which may damage other electronic parts or printed wiring boards. Absent.
However, as a problem of the soldering method using laser light, the generation of flux scattering and the generation of solder balls have become problems due to rapid heating of the solder material.
Therefore, various techniques have been disclosed for the problem of soldering using laser light.

例えば、特許文献1では、軟化点が130℃以上の高軟化点ロジン系樹脂を70%以上含有するロジン系樹脂及び有機酸及び溶剤及び25℃で固体の有機ハロゲン化合物を含有するフラックスとはんだ粉末からなるはんだ組成物をレーザーはんだ付けに用いることで、はんだボールの発生やフラックス飛散の発生を抑制する技術が開示されている。
また、特許文献2では、エポキシアクリレート化合物を含有するフラックスとはんだ粉末からなるはんだ組成物をレーザーはんだ付けに用いることにより、はんだボールの発生やフラックスの広がりを抑制する技術が開示されている。
For example, in Patent Document 1, a rosin-based resin containing 70% or more of a high-softening-point rosin-based resin having a softening point of 130° C. or more, an organic acid and a solvent, and a flux containing an organic halogen compound solid at 25° C. and solder powder. There is disclosed a technique for suppressing the generation of solder balls and the generation of flux scattering by using a solder composition containing the above in laser soldering.
Further, Patent Document 2 discloses a technique of suppressing the generation of solder balls and the spread of flux by using a solder composition including a flux containing an epoxy acrylate compound and solder powder for laser soldering.

しかし、特許文献1や特許文献2で開示されている技術には課題も残されており、例えば、はんだこてを用いるはんだ付け方式においての問題が残っている。
また、フラックスを用いたはんだ組成物を用いているため、フラックス飛散をなくすことは困難であるため、広くはんだ付け方法の対応が可能なはんだ組成物が求められている。
However, the techniques disclosed in Patent Document 1 and Patent Document 2 still have problems, and for example, problems remain in the soldering method using a soldering iron.
Further, since the solder composition using the flux is used, it is difficult to eliminate the scattering of the flux. Therefore, there is a demand for a solder composition which can be widely applied to the soldering method.

特開2015−142936号公報JP, 2005-142936, A 特開2014−124649号公報JP, 2014-124649, A

本発明は、レーザーはんだ付け方法に於いて、微細な電子部品の接合は可能となっているが、従来のレーザーはんだ付け用はんだペーストや、やに入りはんだでは、レーザー光による急激な加熱により、フラックス飛散が発生するという課題が残っているため、本発明ではレーザーはんだ付けにおいてフラックス飛散の発生の等が無く、はんだ付け時に於いてもフラックスの使用が不要なレーザーはんだ付け用はんだ組成物及びはんだ接合部の提供を目的とする。 The present invention, in the laser soldering method, it is possible to bond fine electronic components, in the conventional solder paste for laser soldering, or flux cored solder, by rapid heating by laser light, Since the problem of flux scattering remains, in the present invention there is no occurrence of flux scattering in laser soldering, and the solder composition and solder for laser soldering that does not require the use of flux during soldering The purpose is to provide a joint.

本発明者らは、上記目的を達成すべく、レーザーはんだ付けと鉛フリーはんだ合金組成に着目して鋭意検討を重ねた結果、フラックスを含有しないはんだ組成物を用いて、当該はんだ組成物の外郭が同はんだ組成物の酸化物又は同はんだ組成を主とする酸化物で覆われた状態のものを用いて、それに瞬時にレーザー光を照射して急速に加熱しはんだ組成物を溶解させることによってフラックスが不要なはんだ付け方法を見出し、本発明を完成するに至った。 In order to achieve the above-mentioned object, the present inventors have conducted extensive studies focusing on laser soldering and lead-free solder alloy composition, and as a result, using a flux-free solder composition, the outer shell of the solder composition By using an oxide covered with an oxide of the same solder composition or an oxide mainly composed of the same solder composition, and irradiating it with a laser beam instantly to rapidly heat it to dissolve the solder composition. The present invention has been completed by finding a soldering method that requires no flux.

即ち本発明は、レーザーはんだ付けにおいて、使用するはんだ組成物の外郭をはんだ組成物の酸化物で被覆されたものを用い、そこにレーザー光を照射させて瞬時にはんだ組成物を加熱することにより、はんだ組成物の内部が先に膨張することによって、内部の酸化していないはんだ組成物が外郭のはんだ組成物の酸化物層を突き破り、はんだ接合物に接触することで、接合界面にはんだ組成物の濡れがスムーズに進行し、良好なはんだ付けが可能となる。
そして、フラックスを使用していないはんだ組成物を使用することにより、フラックス飛散も発生しない。
That is, the present invention, in the laser soldering, by using the outer shell of the solder composition used is coated with an oxide of the solder composition, by irradiating the laser light there to instantly heat the solder composition By expanding the inside of the solder composition first, the non-oxidized solder composition in the interior breaks through the oxide layer of the outer solder composition and contacts the solder joint, so that the solder composition is formed at the joint interface. Good wetting progresses smoothly, and good soldering becomes possible.
Further, by using a solder composition that does not use flux, flux scattering does not occur.

本発明は、レーザーはんだ付けに於いて、フラックス飛散を発生させることなく微細な電子部品を接合できるため、はんだ接合の信頼性や不良率の低減も期待でき、電子機器の接合等に広く応用が可能となる。 INDUSTRIAL APPLICABILITY In the laser soldering, the present invention can join fine electronic components without causing flux scattering, so that reliability of solder joining and reduction of defective rate can be expected, and it can be widely applied to joining electronic devices. It will be possible.

はんだボールを示すイメージ図Image diagram showing solder balls 本発明のレーザーはんだ付け用はんだ組成物を示すイメージ図Image diagram showing the solder composition for laser soldering of the present invention はんだボールで接合した際の接合不良を示したイメージ図Image diagram showing the joint failure when joining with solder balls 本発明のレーザー用はんだ付けはんだ組成物にレーザー光を照射してるイメージ図Image diagram of irradiating laser light to the soldering solder composition of the present invention 本発明のレーザー用はんだ付けはんだ組成物がレーザー光により加熱され、内部のはんだ組成物が外郭を破り出ていく状況を例示するイメージ図An image diagram illustrating a situation in which the soldering solder composition for laser of the present invention is heated by laser light, and the solder composition inside breaks through the outer shell. 本発明のレーザー用はんだ付けはんだ組成物にレーザー光を用いて、基板と接合させた状態を示すイメージ図Laser soldering solder composition for laser of the present invention, using a laser beam, an image diagram showing a state of being joined to the substrate

本発明のレーザーはんだ付け用のはんだ組成物について、以下に詳細に説明する。
本発明のレーザーはんだ付け用のはんだ組成物は、鉛を含有するはんだ合金又は鉛フリーはんだ合金とその外郭は当該はんだ組成物の酸化物又は当該はんだ組成物を主成分とする酸化物からなることを特徴としている。
The solder composition for laser soldering of the present invention will be described in detail below.
The solder composition for laser soldering of the present invention comprises a solder alloy containing lead or a lead-free solder alloy and an outer shell thereof made of an oxide of the solder composition or an oxide containing the solder composition as a main component. Is characterized by.

本発明のレーザーはんだ付け用のはんだ組成物に用いるはんだ合金は、鉛を含有する場合のはんだ合金も鉛フリーはんだ合金も、本発明の効果を有する範囲に於いて、形状や組成は限定されない。
鉛を含有するはんだ合金の組成として、例えば、SnPb共晶合金やPb−5Sn合金等が例示できる。
また、鉛フリーのはんだ合金の組成として、Sn−Cu系合金、Sn−Ag−Cu系合金、Sn−Cu−Ni系合金、Sn−Bi系合金、Sn−Zn系合金、Bi−In系合金、Sn−Sb系合金等が例示できる。
そして、上記のはんだ合金組成の外郭に酸化物を生成させる目的で、P、Ge、Ga、Si、Ti、Al、Mn等の酸化防止剤を添加することが出来る。
当該酸化防止剤は本発明の効果の有する範囲に於いて配合量に制限はなく、はんだ組成物を100として、0.0001質量%〜0,01質量%が好ましい。
Regarding the solder alloy used in the solder composition for laser soldering of the present invention, neither the solder alloy containing lead nor the lead-free solder alloy is limited in shape and composition as long as the effects of the present invention are achieved.
Examples of the composition of the solder alloy containing lead include SnPb eutectic alloy and Pb-5Sn alloy.
Moreover, as a composition of a lead-free solder alloy, a Sn-Cu-based alloy, a Sn-Ag-Cu-based alloy, a Sn-Cu-Ni-based alloy, a Sn-Bi-based alloy, a Sn-Zn-based alloy, a Bi-In-based alloy. , Sn-Sb type alloys and the like can be exemplified.
Then, an antioxidant such as P, Ge, Ga, Si, Ti, Al, or Mn can be added for the purpose of generating an oxide in the outer portion of the solder alloy composition.
The amount of the antioxidant is not limited within the range of the effect of the present invention, and is preferably 0.0001 mass% to 0.01 mass% with the solder composition as 100.

次に、本発明の実施の形態について説明する。
通常、はんだボールは図1に示すようにはんだ合金でできている。
本発明のレーザーはんだ付け用はんだ組成物の場合は、図2で示すようにはんだ組成物の外郭を当該はんだ組成物の酸化物又は当該はんだ組成物を主成分とする酸化物で被覆された状態となっている。
酸化物は一般的に酸化前の組成の熱線膨張係数が大きい。例えば、Siで比較するとSiが2.4に対しSiOは1.1である。本発明はこの現象を応用している。
Next, an embodiment of the present invention will be described.
Usually, the solder balls are made of a solder alloy as shown in FIG.
In the case of the solder composition for laser soldering of the present invention, as shown in FIG. 2, the outer periphery of the solder composition is covered with an oxide of the solder composition or an oxide containing the solder composition as a main component. Has become.
An oxide generally has a large coefficient of linear thermal expansion before being oxidized. For example, when comparing Si, 2.4 is Si and 1.1 is SiO 2 . The present invention applies this phenomenon.

一般にはんだボールに発生する酸化膜は図3で例示するように、例えば、接合時に基板(4)とはんだ(5)の接合界面(5b)に酸化膜等が原因となる接合不良が発生することが知られている。
しかし、レーザーはんだ付け用はんだ組成物の場合は、予めはんだ組成物に抗酸化作用を有するP、Ge、Ga、Si、Ti、Al、Mn等が配合されており、はんだボールや線状はんだに成形された際に、図2で示すように、本発明のレーザーはんだ付け用はんだ組成物(2)の内部(2b)は酸化物が殆ど含有されていないはんだ組成物で、外郭(2a)は当該はんだ組成に含まれているP、Ge、Ga、Si、Ti、Al、Mnを主とするはんだ組成物の酸化物で形成されている。
Generally, an oxide film generated on a solder ball may cause a bonding failure due to an oxide film or the like at a bonding interface (5b) between a substrate (4) and a solder (5) at the time of bonding, as illustrated in FIG. It has been known.
However, in the case of a solder composition for laser soldering, P, Ge, Ga, Si, Ti, Al, Mn, etc., which have an antioxidant effect, are mixed in advance in the solder composition, so that the solder ball or the linear solder is When molded, as shown in FIG. 2, the inside (2b) of the laser soldering solder composition (2) of the present invention is a solder composition containing almost no oxide, and the outer shell (2a) is It is formed of an oxide of a solder composition mainly containing P, Ge, Ga, Si, Ti, Al and Mn contained in the solder composition.

本発明のレーザーはんだ付け用はんだ(2)は、熱線膨張が大きいはんだ組成物からなる内部(2b)と熱線膨張が比較的小さいはんだ組成物の酸化物である外郭(2a)からなるため、当該はんだが加熱されると内部のはんだ組成物が大きく膨張して外郭のはんだ組成物の酸化物に負荷をかけることになり、加熱を急速に行った場合は、外郭の酸化物層が内部のはんだ組成物の膨張スピードに追随することが出来ず、外郭が破壊され内部のはんだ組成物が押し出され、接合対象との界面に広がる。当該はんだ組成物は酸化物が極めて少ない為濡れ性に優れ、瞬時に接合対象との界面に濡れ広がりはんだ付けが可能となる。 Since the solder (2) for laser soldering of the present invention comprises an inside (2b) made of a solder composition having a large thermal linear expansion and an outer shell (2a) made of an oxide of a solder composition having a relatively small thermal linear expansion, When the solder is heated, the solder composition inside expands greatly and loads the oxide of the outer solder composition, and when heating is performed rapidly, the outer oxide layer causes the solder inside The composition cannot keep up with the expansion speed of the composition, the outer shell is destroyed, the solder composition inside is extruded, and spreads to the interface with the bonding target. Since the solder composition has very little oxide, it has excellent wettability, and can instantly spread to the interface with the object to be joined and soldered.

上述の現象を、図4、図5、及び図6を用いて詳細に説明する。
図4は、本発明のレーザーはんだ付け用はんだ組成物(2)を基板(4)の上に設置し、そこにレーザー光(6)を照射する様子を示したイメージ図である。
本発明のレーザーはんだ付け用はんだ組成物に照射するレーザー光は、本発明の効果を有する範囲に於いて波長や出力、方式に特に制限はないが、瞬時に加熱が比較的可能な波長400nm〜530nmの緑色及び青色レーザー光が好ましい。
The above phenomenon will be described in detail with reference to FIGS. 4, 5 and 6.
FIG. 4 is an image diagram showing a state in which the solder composition (2) for laser soldering of the present invention is placed on a substrate (4) and a laser beam (6) is applied thereto.
The laser light for irradiating the solder composition for laser soldering of the present invention is not particularly limited in wavelength, output, and method within a range having the effect of the present invention, but a wavelength of 400 nm to which instantaneous heating is relatively possible. 530 nm green and blue laser light is preferred.

図5は、本発明のレーザー用はんだ組成物(2)にレーザー光を照射し、はんだが瞬時に加熱され、内部のはんだ組成物(2b)が外郭のはんだ組成物(2a)を破って外に出ている様子を示している。
図6は、本発明のレーザー用はんだ組成物を用いてレーザーはんだ付けを行った後の基板(4)とはんだ(7)の接合状況を示した図である。
レーザー光により瞬時に加熱されたはんだの内部から溶融したはんだ組成物はんだの外郭を破り出て、酸化物を殆ど含有しない状態で基板との界面に接触するため、スムーズに濡れ広がり接合界面(7a)が形成され、良好な接合が可能となる。
線状はんだに於いても、同様に接合対象物との界面にはんだ組成物が濡れ広がるため、良好なはんだ付けが可能となる。
FIG. 5 shows that the solder composition (2) for laser of the present invention is irradiated with a laser beam to instantly heat the solder, and the solder composition (2b) inside breaks the solder composition (2a) in the outer shell to remove the outside. It is shown in.
FIG. 6 is a view showing a bonding state of the substrate (4) and the solder (7) after performing laser soldering using the laser solder composition of the present invention.
The solder composition melted from the inside of the solder which was instantaneously heated by the laser light broke through the outer shell of the solder composition and contacted with the interface with the substrate in a state containing almost no oxide. ) Is formed, and good bonding is possible.
Also in the case of linear solder, since the solder composition wets and spreads at the interface with the object to be joined, good soldering becomes possible.

本発明のレーザー用はんだ組成物を用いたレーザーはんだ付けは、フラックスを含有しない組成であること、そして、接合の対象となる基板に対しても活性力の高い溶融された酸化物の殆ど含まれないはんだ組成物が直に接合界面に接触するため、ポストフラックスを用いることなく良好な接合が可能となるため、フラックス飛散が発生しない。 Laser soldering using the laser solder composition of the present invention has a composition that does not contain a flux, and contains almost all molten oxides that have high activity even with respect to the substrates to be joined. Since no solder composition directly contacts the bonding interface, good bonding can be performed without using post flux, and thus no flux scattering occurs.

本発明のレーザー用はんだ組成物を用いたレーザーはんだ付けは、フラックス飛散等の接合不具合が発生せず、微細なはんだ付けが可能であることから、レーザー光を用いた電子部品の接合に応用が期待できる。 Laser soldering using the laser solder composition of the present invention does not cause joining defects such as flux scattering, and since fine soldering is possible, it can be applied to joining electronic components using laser light. Can be expected.

1 従来のはんだ合金
2 本発明のはんだ
2a 本発明のはんだ組成物の外郭(酸化物層)
2b 本発明のはんだ組成物
3 電子部品
4 基板
5 はんだ接合部
5a 電子部品との接合界面
5b 基板との接合界面
6 レーザー光
7 本発明のはんだ組成物で接合したはんだ
7a 本発明のはんだ組成物で接合したはんだとと基板の接合界面







1 Conventional Solder Alloy 2 Solder 2a of the Present Invention 2a Outer Shell (Oxide Layer) of Solder Composition of the Present Invention
2b Solder composition of the present invention 3 Electronic component 4 Substrate 5 Solder joint part 5a Joining interface with electronic component 5b Joining interface with substrate 6 Laser light 7 Solder joined with the solder composition of the present invention 7a Solder composition of the present invention Interface between the solder and the board







Claims (4)

レーザーはんだ付け用のはんだ組成物であって、当該はんだ組成物がはんだ組成物及びその外郭に当該はんだ組成物の酸化物又は当該はんだ組成物を主とする酸化物から構成されることを特徴とするはんだ組成物。 A solder composition for laser soldering, characterized in that the solder composition is composed of an oxide of the solder composition or an oxide mainly of the solder composition in the outer periphery of the solder composition. Solder composition. はんだ組成物が鉛フリーはんだ合金からなることを特徴とする請求項1記載のレーザーはんだ付け用のはんだ組成物。 The solder composition for laser soldering according to claim 1, wherein the solder composition comprises a lead-free solder alloy. はんだ組成物に酸化防止剤として、P、Ge、Ga、Si、Ti、Al、Mnを含有したことを特徴とする請求項1及び請求項2記載のレーザーはんだ付け用のはんだ組成物。 The solder composition for laser soldering according to claim 1 or 2, wherein P, Ge, Ga, Si, Ti, Al, and Mn are contained in the solder composition as an antioxidant. レーザーはんだ付けに於いて、請求項1〜請求項3記載のはんだ組成物を用いてはんだ付けをしたことを特徴とするはんだ接合部。




In laser soldering, a solder joint portion characterized by being soldered using the solder composition according to claim 1.




JP2018218157A 2018-11-21 2018-11-21 Solder composition for laser soldering, and solder joint part Pending JP2020082117A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002076043A (en) * 2000-08-28 2002-03-15 Mitsubishi Electric Corp Bump forming method, semiconductor device, and bump forming device
JP2006210761A (en) * 2005-01-31 2006-08-10 Fujitsu Ltd Solder joint method and device thereof
JP2016097444A (en) * 2014-11-26 2016-05-30 住友金属鉱山株式会社 Pb-FREE Sb-In-BASED SOLDER ALLOY
JP2016112587A (en) * 2014-12-15 2016-06-23 住友金属鉱山株式会社 Pb-FREE Au-Ge-BASED SOLDER ALLOY WHERE ENERGY ABSORPTION AMOUNT IS CONTROLLED AND SEALED OR BONDED ELECTRONIC COMPONENT USING THE SAME

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002076043A (en) * 2000-08-28 2002-03-15 Mitsubishi Electric Corp Bump forming method, semiconductor device, and bump forming device
JP2006210761A (en) * 2005-01-31 2006-08-10 Fujitsu Ltd Solder joint method and device thereof
JP2016097444A (en) * 2014-11-26 2016-05-30 住友金属鉱山株式会社 Pb-FREE Sb-In-BASED SOLDER ALLOY
JP2016112587A (en) * 2014-12-15 2016-06-23 住友金属鉱山株式会社 Pb-FREE Au-Ge-BASED SOLDER ALLOY WHERE ENERGY ABSORPTION AMOUNT IS CONTROLLED AND SEALED OR BONDED ELECTRONIC COMPONENT USING THE SAME

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