JP2022084056A

JP2022084056A - Squeegee with slit

Info

Publication number: JP2022084056A
Application number: JP2020195642A
Authority: JP
Inventors: 隆行石引; Takayuki Ishibiki
Original assignee: Bon Mark Co Ltd
Current assignee: Bon Mark Co Ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2022-06-07

Abstract

To provide a squeegee with slit which can smoothly without being affected by a protrusion of a metal mask for a COB substrate.SOLUTION: A squeegee is used when performing solder printing by use of a metal mask for COB substrate comprising a protrusion for releasing an electronic component, and many openings provided for locating other components around the vicinity of the protrusion. The squeegee comprises a plurality of oblong parts of which lower half parts are divided and firmed by a plurality of slits, which are formed up to a position in the middle from a lower end part to an upper end part of the squeegee, and of which upper end parts are integrally connected by a connection part. The plurality of divided and formed oblong parts comprises: upper widening/lower narrowing oblong parts of which an upper part is widened and a lower part is narrowed, and upper narrowing/lower widening oblong parts which are so located adjacent to the upper widening/lower narrowing oblong parts as to be alternately positioned, and of which an upper part is narrowed and a lower part is widened.SELECTED DRAWING: Figure 2

Description

この発明は、先付部品である半導体チップ等の電子部品を多数搭載した印刷配線基板（チップオンボード基板（ＣＯＢ基板）に、凸部加工を施したメタルマスクを使って半田印刷を行う際に用いられるスリット付きスキージに関するものである。 According to the present invention, when a printed wiring board (chip-on-board board (COB board)) on which a large number of electronic parts such as semiconductor chips, which are pre-attached parts, are mounted, solder printing is performed using a metal mask having a convex portion processed. It relates to a squeegee with a slit used.

従来、半導体チップ等の電子部品を搭載した印刷配線基板（ＣＯＢ基板）に、メタルマスクを用いて半田クリームを印刷する場合、椀状にメタル面を突出加工した椀型の凸部を有するメタルマスクが用いられる。この椀型の凸部を有するメタルマスクを用いて半田クリームを印刷する場合は、多数の切り欠きを有するスキージを用いることにより、半導体チップのお椀部分に対応するスキージ部分が逃げるので、その他の部分はマスクの開口上をスキージが掃引することで半田クリームを印刷することができる（例えば、特許文献１参照）。また、スキージの摺動部がスクリーン版面に接触する先端部から取付部に向かって延長しかつ摺動部の長手方向に対して直角に延長する互に平行な平面状の切り込みを多数個備え、摺動部の先端部側が多数個の摺動片に分割されているスクリーン印刷用スキージが知られている（特許文献２参照）。 Conventionally, when solder cream is printed on a printed wiring board (COB board) on which electronic components such as semiconductor chips are mounted, a metal mask having a bowl-shaped convex portion having a bowl-shaped metal surface projected. Is used. When printing solder cream using this metal mask with bowl-shaped protrusions, by using a squeegee with a large number of notches, the squeegee portion corresponding to the bowl portion of the semiconductor chip escapes, so other parts Can print the solder cream by sweeping the squeegee over the opening of the mask (see, for example, Patent Document 1). In addition, the sliding portion of the squeegee is provided with a large number of parallel planar notches extending from the tip portion in contact with the screen plate surface toward the mounting portion and extending at a right angle to the longitudinal direction of the sliding portion. A screen printing squeegee in which the tip end side of the sliding portion is divided into a large number of sliding pieces is known (see Patent Document 2).

特開平１０－２４５５２号公報Japanese Unexamined Patent Publication No. 10-24552 特開平１１－１３８７４９号公報Japanese Unexamined Patent Publication No. 11-138749

近年はＣＯＢ基板上に搭載する電子部品の数が多くなり、ＣＯＢ基板の面積の関係で凸部近傍にも他の電子部品を配置するため、凸部近傍にもメタルマスクの開口があり、それをスキージ印刷する場合には、スキージの切り欠き又は切り込みを凸部の寸法に正確に合わせる必要が出てきている。しかし、スキージの各切り欠き又は各切り込みは、縦方向に一直線に設けられているため、凸部の影響を受け易く凸部に対する追従性に問題があり、凸部近傍の開口に半田クリームを十分に印刷できないことがあった。また、従来の多数の切り欠き又は切り込みを有するスキージでは、スキージに位置合わせの目印が無いため、メタルマスクとの位置合わせが困難になっている。 In recent years, the number of electronic components mounted on the COB substrate has increased, and due to the area of the COB substrate, other electronic components are also placed near the convex parts, so there is an opening in the metal mask near the convex parts. When printing a squeegee, it is becoming necessary to accurately match the notch or notch of the squeegee to the size of the convex portion. However, since each notch or each notch of the squeegee is provided in a straight line in the vertical direction, it is easily affected by the convex portion and there is a problem in followability to the convex portion, and sufficient solder cream is applied to the opening near the convex portion. Sometimes I couldn't print. Further, in the conventional squeegee having a large number of notches or notches, the squeegee has no alignment mark, which makes it difficult to align with the metal mask.

この発明は、上述のような課題を解決するためになされたもので、ＣＯＢ基板用メタルマスクの凸部の影響を受けずにスムーズに動くことができるスリット付きスキージを提供するものである。 The present invention has been made to solve the above-mentioned problems, and provides a squeegee with a slit that can move smoothly without being affected by the convex portion of the metal mask for a COB substrate.

この発明に係るスリット付きスキージにおいては、電子部品を逃がすための凸部と、凸部の近傍周辺に他の部品を配置するために設けられた多数の開口とを備えたＣＯＢ基板用メタルマスクを使って半田印刷を行う際に用いられるスキージであって、スキージの下端部から上端部に向ってその途中の位置までに形成された複数のスリットにより下半部が分割形成され、上端部が連結部により一体的に連結された複数の短冊部を備え、分割形成された複数の短冊部は、上部が拡幅で下部が縮幅となる上部拡幅・下部縮幅形短冊部と、上部拡幅・下部縮幅形短冊部に隣接して互い違いに交互に位置するように配置された上部が縮幅で下部が拡幅となる上部縮幅・下部拡幅形短冊部とからなるものである。 In the squeegee with slits according to the present invention, a metal mask for a COB substrate having a convex portion for allowing an electronic component to escape and a large number of openings provided for arranging other components in the vicinity of the convex portion is provided. A squeegee used for solder printing using the squeegee. The lower half is divided and formed by a plurality of slits formed from the lower end to the upper end of the squeegee to a position in the middle of the squeegee, and the upper end is connected. The plurality of strips are provided with a plurality of strips integrally connected by a portion, and the plurality of strips formed separately are an upper widening / lower narrowing type strip portion in which the upper part is widened and the lower part is narrowed, and an upper widening / lower part. It consists of an upper narrowed strip and a lower widened strip, which are arranged adjacent to the narrowed strips so as to be alternately located alternately with the upper part narrowed and the lower part widened.

また、上部拡幅・下部縮幅形短冊部の拡幅部から縮幅部に向かう境界部分は内側に膨らむＲ形状を呈しており、上部縮幅・下部拡幅形短冊部の縮幅部から拡幅部に向かう境界部分は外側に膨らむＲ形状を呈しているものである。 In addition, the boundary portion from the widened portion to the narrowed portion of the upper widened / lower narrowed strip portion has an R shape that bulges inward, and from the narrowed portion to the widened portion of the upper narrowed / lower widened strip portion. The facing boundary portion has an R shape that bulges outward.

また、上部拡幅・下部縮幅形短冊部の拡幅部から縮幅部に向かう境界部分は水平形状を呈しており、上部縮幅・下部拡幅形短冊部の縮幅部から拡幅部に向かう境界部分は水平形状を呈しているものである。 In addition, the boundary portion from the widened portion to the narrowed portion of the upper widened / lower narrowed strip portion has a horizontal shape, and the boundary portion from the narrowed portion to the widened portion of the upper narrowed / lower widened strip portion has a horizontal shape. Has a horizontal shape.

また、電子部品を逃がすための凸部と、凸部の近傍周辺に他の部品を配置するために設けられた多数の開口とを備えたＣＯＢ基板用メタルマスクを使って半田印刷を行う際に用いられるスキージであって、スキージの下端部から上端部に向ってその途中の位置までに形成された複数のスリットにより下半部が分割形成され、上端部が連結部により一体的に連結された複数の短冊部と、ＣＯＢ基板用メタルマスクの凸部とスキージのスリットの位置を正確に合わせるために、スキージの任意の位置に形成された位置合わせマークと、を備えたものである。 Further, when performing solder printing using a metal mask for a COB substrate having a convex portion for allowing an electronic component to escape and a large number of openings provided for arranging other components in the vicinity of the convex portion. In the squeegee used, the lower half is divided and formed by a plurality of slits formed from the lower end to the upper end of the squeegee to a position in the middle thereof, and the upper end is integrally connected by the connecting portion. It is provided with a plurality of strips and an alignment mark formed at an arbitrary position of the squeegee in order to accurately align the convex portion of the metal mask for the COB substrate with the slit of the squeegee.

また、分割形成された複数の短冊部は、上部が拡幅で下部が縮幅となる上部拡幅・下部縮幅形短冊部と、前記上部拡幅・下部縮幅形短冊部に隣接して互い違いに交互に位置するように配置された上部が縮幅で下部が拡幅となる上部縮幅・下部拡幅形短冊部とからなるものである。 In addition, the plurality of strips formed separately are alternately adjacent to the upper widening / lower narrowing type strips having the upper part widening and the lower part narrowing, and the upper widening / lower narrowing type strips. It consists of an upper narrowed / lower widened strip section in which the upper part is narrowed and the lower part is widened.

また、スキージの任意の位置に形成された位置合わせマークは、離れた位置に複数個設けられているものである。 Further, a plurality of alignment marks formed at arbitrary positions of the squeegee are provided at distant positions.

また、スキージの任意の位置に形成された位置合わせマークは、レーザーマーキングにより縦方向に形成されているものである。 Further, the alignment mark formed at an arbitrary position on the squeegee is formed in the vertical direction by laser marking.

この発明によれば、ＣＯＢ基板用メタルマスクの凸部の影響を受けずにスムーズに動くことが可能なスリット付きスキージを得ることができる。 According to the present invention, it is possible to obtain a squeegee with a slit that can move smoothly without being affected by the convex portion of the metal mask for a COB substrate.

この発明の実施例１におけるＣＯＢ基板用メタルマスクを示す平面図である。It is a top view which shows the metal mask for a COB substrate in Example 1 of this invention. この発明の実施例１におけるスリット付きスキージの一部を示す正面図である。It is a front view which shows a part of the squeegee with a slit in Example 1 of this invention.

実施例１．
図１はこの発明の実施例１におけるＣＯＢ基板用メタルマスクを示す平面図、図２はこの発明の実施例１におけるスリット付きスキージの一部を示す正面図である。
半導体チップ等の電子部品を多数搭載した印刷配線基板（チップオンボード基板（以下ＣＯＢ基板という）に、半田クリームを印刷する場合は、例えば椀状にメタル面を突出加工した椀型の凸部加工を施したＣＯＢ基板用メタルマスク１を使って半田印刷を行う。このＣＯＢ基板用メタルマスク１は、半導体チップ等の電子部品を逃がすための凸部２と、凸部２の近傍周辺の上下左右４箇所に他の部品を配置するために、多数の開口３が設けられている。そして、これらの凸部２と、凸部近傍周辺の多数の開口３とからなる印刷パターン４は、上下左右に複数個が並列配置されており、この実施例では、縦２個、横４個、計８個が並列に配置されている。このＣＯＢ基板用メタルマスク１は、複数個の印刷パターン４の外周部の四隅に印刷配線基板への位置合わせ用の認識マーク５が施されている。
上記のように構成されたＣＯＢ基板用メタル１の半田印刷に用いられるこの発明のスリット付きスキージ７は、厚さが例えば約０．２ｍｍ～０．５ｍｍのメタルスキージである。なお、メタルスキージに代えてウレタンスキージであっても良く、ウレタンスキージの場合、厚さは例えば約５．０ｍｍ程度である。図２に示すように、スキージ７の下端部から上方に向かってその途中の位置までに形成された複数のスリット８により下半部が分割形成された複数の短冊部９を有しており、スリット８の幅は例えば約０．０５ｍｍであり、このスリット８は下方から約１／３の部分を段状に形成している。スリット８により分割された短冊部９は、スキージ７の上端部において連結部１０により一体的に連結されている。複数の短冊部９は、上部が拡幅（例えば、約１２ｍｍ）で下部が縮幅（例えば、約８ｍｍ）となる上部拡幅・下部縮幅形短冊部９ａと、この上部拡幅・下部縮幅形短冊部９ａに隣接する上部が縮幅（例えば、１０ｍｍ）で下部が拡幅（例えば、１５ｍｍ）となる上部縮幅・下部拡幅形短冊部９ｂとから構成されており、上部拡幅・下部縮幅形短冊部９ａと上部縮幅・下部拡幅形短冊部９ｂは互い違いに交互に位置するように配置されている。上部拡幅・下部縮幅形短冊部９ａの拡幅部から縮幅部に向かう境界部分は内側に膨らむＲ形状を呈しており、また上部縮幅・下部拡幅形短冊部９ｂの縮幅部から拡幅部に向かう境界部分は外側に膨らむＲ形状を呈している。したがって、ＣＯＢ基板用メタルマスク１の凸部２を通過する際でも、スリット８により分割されたスキージ７の各短冊部９ａ、９ｂが凸部２の影響を受けることなく、しなやかにかつスムーズに動くことができるので、凸部近傍であってむらなく印刷することが可能となる。なお、上部拡幅・下部縮幅形短冊部９ａの拡幅部から縮幅部に向かう境界部分は外側から内側に向かう水平形状を呈しても良く、また上部縮幅・下部拡幅形短冊部９ｂの縮幅部から拡幅部に向かう境界部分は内側から外側に向かう水平形状を呈していても良い。
この発明のスリット付きスキージ７は、ＣＯＢ基板用メタルマスク１の凸部２とスキージ７のスリット８の位置を正確に合わせるために、スキージの任意の位置、例えば中央部にレーザーマーキング等により縦方向に延びる位置合わせマーク１１としてのセンターラインが施されている。これにより、ＣＯＢ基板用メタルマスクの凸部とスキージ７のスリット８の位置を正確に合わせることが可能となる。なお、位置合わせマーク１１は、レーザーマーキングに限定されるものではない。また、位置合わせマーク１１が無くても、スリット８のうちのいずれか一つを、作業者が目視により確認することができるのであれば、位置合わせマーク１１は必ずしも必要とはならない。 Example 1.
FIG. 1 is a plan view showing a metal mask for a COB substrate according to the first embodiment of the present invention, and FIG. 2 is a front view showing a part of a slitted squeegee according to the first embodiment of the present invention.
When printing solder cream on a printed wiring board (chip-on-board board (hereinafter referred to as COB board)) on which a large number of electronic components such as semiconductor chips are mounted, for example, a bowl-shaped convex portion is processed by projecting a metal surface into a bowl shape. Solder printing is performed using the metal mask 1 for a COB substrate that has been subjected to A large number of openings 3 are provided in order to arrange other parts at the four locations, and the print pattern 4 composed of these convex portions 2 and a large number of openings 3 around the convex portions is formed in the vertical and horizontal directions. In this embodiment, a plurality of pieces are arranged in parallel, and in this embodiment, two pieces are arranged vertically and four pieces are arranged horizontally, for a total of eight pieces. The metal mask 1 for a COB substrate has a plurality of printing patterns 4. Recognition marks 5 for alignment with the printed wiring board are provided at the four corners of the outer peripheral portion.
The slitted squeegee 7 of the present invention used for solder printing of the metal 1 for a COB substrate configured as described above is a metal squeegee having a thickness of, for example, about 0.2 mm to 0.5 mm. A urethane squeegee may be used instead of the metal squeegee, and in the case of the urethane squeegee, the thickness is, for example, about 5.0 mm. As shown in FIG. 2, it has a plurality of strips 9 whose lower half is divided and formed by a plurality of slits 8 formed from the lower end of the squeegee 7 to a position in the middle thereof. The width of the slit 8 is, for example, about 0.05 mm, and the slit 8 has a stepped portion of about 1/3 from the bottom. The strip portion 9 divided by the slit 8 is integrally connected by the connecting portion 10 at the upper end portion of the squeegee 7. The plurality of strip portions 9 include an upper widening / lower narrowing type strip portion 9a having a widened upper portion (for example, about 12 mm) and a reduced width (for example, about 8 mm) at the lower portion, and the upper widening / lower narrowing type strip portion 9a. The upper part adjacent to the portion 9a is narrowed (for example, 10 mm) and the lower part is widened (for example, 15 mm). The portions 9a and the upper narrowed / lower widened strips 9b are arranged so as to be alternately positioned alternately. The boundary portion from the widened portion to the narrowed portion of the upper widened / lower narrowed strip portion 9a has an R shape that bulges inward, and the narrowed portion to the widened portion of the upper narrowed / lower widened strip portion 9b. The boundary portion toward the surface has an R shape that bulges outward. Therefore, even when passing through the convex portion 2 of the metal mask 1 for the COB substrate, the strip portions 9a and 9b of the squeegee 7 divided by the slit 8 move flexibly and smoothly without being affected by the convex portion 2. Therefore, it is possible to print evenly in the vicinity of the convex portion. The boundary portion from the widened portion to the narrowed portion of the upper widened / lower narrowed strip portion 9a may have a horizontal shape from the outside to the inside, and the upper narrowed / lower narrowed strip portion 9b may be reduced. The boundary portion from the width portion to the widening portion may have a horizontal shape from the inside to the outside.
In the slitted squeegee 7 of the present invention, in order to accurately align the positions of the convex portion 2 of the metal mask 1 for the COB substrate and the slit 8 of the squeegee 7, an arbitrary position of the squeegee, for example, a laser marking at the center portion in the vertical direction. A center line is provided as an alignment mark 11 extending to. This makes it possible to accurately align the convex portion of the metal mask for the COB substrate with the slit 8 of the squeegee 7. The alignment mark 11 is not limited to laser marking. Further, even if the alignment mark 11 is not provided, the alignment mark 11 is not always necessary if the operator can visually confirm any one of the slits 8.

１ＣＯＢ基板用メタルマスク
２凸部
３多数の開口
４印刷パターン
５認識マーク
７スリット式スキージ
８複数のスリット
９複数の短冊部
９ａ上部拡幅・下部縮幅形短冊部
９ｂ上部縮幅・下部拡幅形短冊部
１０連結部
１１ＣＯＢ基板用メタルマスクとの位置合わせマーク（センターライン） 1 Metal mask for COB board 2 Convex part 3 Many openings 4 Printing pattern 5 Recognition mark 7 Slit type squeegee 8 Multiple slits 9 Multiple strips 9a Upper widening / lower narrowing strips 9b Upper narrowing / lower widening Strip part 10 Connecting part 11 Alignment mark with metal mask for COB board (center line)

Claims

Used when performing solder printing using a metal mask for a COB substrate equipped with a convex portion for allowing electronic components to escape and a large number of openings provided for arranging other components in the vicinity of the convex portion. It ’s a squeegee
The lower half portion is divided and formed by a plurality of slits formed from the lower end portion to the upper end portion of the squeegee to a position in the middle thereof, and the upper end portion is provided with a plurality of strip portions integrally connected by the connecting portion. ,
The plurality of strips formed separately are alternately adjacent to the upper widening / lower narrowing strips and the upper widening / lower narrowing strips, in which the upper part is widened and the lower part is narrowed. A squeegee with a slit, which is arranged so as to be located, and consists of an upper narrowed / lower widened strip part in which the upper part is narrowed and the lower part is widened.

The boundary portion from the widened portion to the narrowed portion of the upper widened / lower narrowed strip portion has an R shape that swells inward, and the boundary portion from the narrowed portion to the widened portion of the upper narrowed / lower widened strip portion. The squeegee with a slit according to claim 1, wherein the portion has an R shape that bulges outward.

The boundary part from the widened part to the narrowed part of the upper widened / lower narrowed strip has a horizontal shape from the outside to the inside, and from the narrowed part to the widened part of the upper widened / lower widened strip part. The slitted squeegee according to claim 1, wherein the facing boundary portion has a horizontal shape from the inside to the outside.

Used when performing solder printing using a metal mask for a COB substrate equipped with a convex portion for allowing electronic components to escape and a large number of openings provided for arranging other components in the vicinity of the convex portion. It ’s a squeegee
A plurality of strips in which the lower half is divided and formed by a plurality of slits formed from the lower end to the upper end of the squeegee to a position in the middle thereof, and the upper end is integrally connected by the connecting portion.
In order to accurately align the convex portion of the metal mask for the COB substrate with the slit of the squeegee, the alignment mark formed at an arbitrary position of the squeegee and the alignment mark.
A squeegee with a slit that is characterized by being equipped with.

Used when performing solder printing using a metal mask for a COB substrate equipped with a convex portion for allowing electronic components to escape and a large number of openings provided for arranging other components in the vicinity of the convex portion. It ’s a squeegee
A plurality of strips in which the lower half is divided and formed by a plurality of slits formed from the lower end to the upper end of the squeegee to a position in the middle thereof, and the upper end is integrally connected by the connecting portion.
In order to accurately align the convex portion of the metal mask for the COB substrate with the slit position of the squeegee, an alignment mark formed at an arbitrary position of the squeegee is provided.
The plurality of strips formed separately are alternately adjacent to the upper widening / lower narrowing strips and the upper widening / lower narrowing strips, in which the upper part is widened and the lower part is narrowed. A squeegee with a slit, which is arranged so as to be located, and consists of an upper narrowed / lower widened strip part in which the upper part is narrowed and the lower part is widened.

The slitted squeegee according to claim 4 or 5, wherein a plurality of alignment marks formed at arbitrary positions of the squeegee are provided at distant positions.

The slitted squeegee according to any one of claims 4 to 6, wherein the alignment mark formed at an arbitrary position of the squeegee is formed in the vertical direction by laser marking.