JPH0618239A - Cream solder print inspection equipment - Google Patents

Cream solder print inspection equipment

Info

Publication number
JPH0618239A
JPH0618239A JP17298392A JP17298392A JPH0618239A JP H0618239 A JPH0618239 A JP H0618239A JP 17298392 A JP17298392 A JP 17298392A JP 17298392 A JP17298392 A JP 17298392A JP H0618239 A JPH0618239 A JP H0618239A
Authority
JP
Japan
Prior art keywords
cream solder
area
line sensor
solder
color
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP17298392A
Other languages
Japanese (ja)
Inventor
Yasushi Mizuoka
靖司 水岡
Masao Nagamoto
正雄 長本
Toshihiko Tsujikawa
俊彦 辻川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP17298392A priority Critical patent/JPH0618239A/en
Publication of JPH0618239A publication Critical patent/JPH0618239A/en
Pending legal-status Critical Current

Links

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  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)

Abstract

PURPOSE:To obtain a cream solder print inspection equipment in which the area of cream solder is checked correctly with no influence of directivity of illumination and printing state of cream solder can be inspected correctly. CONSTITUTION:The cream solder print inspection equipment comprises a line sensor 3 disposed above a board 1 printed with a cream solder, and a pair of illuminating means 23, 23 arranged in parallel in the longitudinal direction on the opposite sides of the line sensor 3, wherein the printed board 1 is image pickuped by means of the line sensor 3 while being illuminated through the illuminating means 23, 23. A window frame is then set at a part to be inspected for an image thus produced and the image in the window frame is analyzed thus inspecting the printed state of cream solder 2. The inspection equipment further comprises means 7 for extracting features within the window frame, and solder area decision means 8 for determing an area correction value based on the illuminating direction of the illuminating means 23, 23 and checking good or not basing on the area of cream solder pattern.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、クリーム半田印刷され
たプリント基板の印刷状態を検査する装置に関し、特に
半田面積の良否を検査する装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting a printed state of a printed circuit board printed with cream solder, and more particularly to an apparatus for inspecting the quality of a solder area.

【0002】[0002]

【従来の技術】クリーム半田印刷されたプリント基板を
ラインセンサーで撮像し、その映像信号による画像に対
して被検査部分の窓枠部を設定し、この窓枠部内の画像
を解析してクリーム半田の印刷状態を検査する従来のク
リーム半田印刷検査装置は、図5に示すように構成され
ている。
2. Description of the Related Art A printed circuit board on which cream solder is printed is imaged by a line sensor, a window frame portion of a portion to be inspected is set for an image based on the video signal, and an image in the window frame portion is analyzed to perform solder paste. The conventional cream solder printing inspection device for inspecting the printing state of is configured as shown in FIG.

【0003】すなわち、クリーム半田2が印刷されたプ
リント基板1の上方にラインセンサー14を配すると共
に、ラインセンサー14の両側にその長手方向に平行に
1対の照明手段23,23を配し、これら照明手段2
3,23によって照明した状態で前記プリント基板1を
ラインセンサー14で撮像する。ラインセンサー14か
ら発信された映像信号は画像記憶手段16で受信され
て、ここに記憶される。次いで2値化手段17によっ
て、画像記憶手段16に記憶されている映像信号の内、
クリーム半田検査用の窓枠部内の画像を取り出して2値
化し、制御部18が2値化手段17から受信した2値画
像の面積と重心とを求め、予め設定されている判定基準
面積と比較して、クリーム半田の面積の良否、ひいては
印刷状態の良否を判定していた。
That is, a line sensor 14 is arranged above the printed circuit board 1 on which the cream solder 2 is printed, and a pair of illuminating means 23, 23 are arranged on both sides of the line sensor 14 in parallel with the longitudinal direction thereof. These lighting means 2
The printed circuit board 1 is imaged by the line sensor 14 while being illuminated by 3, 23. The video signal transmitted from the line sensor 14 is received by the image storage means 16 and stored therein. Next, of the video signals stored in the image storage means 16 by the binarization means 17,
The image in the window frame portion for cream solder inspection is taken out and binarized, the control unit 18 obtains the area and the center of gravity of the binary image received from the binarizing means 17, and compares it with a preset judgment reference area. Then, it was determined whether the area of the cream solder was good or bad, and thus the print state was good or bad.

【0004】[0004]

【発明が解決しようとする課題】しかし従来のクリーム
半田印刷検査装置によると、図4に示すように、照明手
段23,23の照明の指向性により、クリーム半田2の
傾斜部の反射光がラインセンサー14に入光せず、図2
及び図3にハッチングで示すように、ラインセンサー1
4(3)に光の返ってこないエリアPが存在する。
However, according to the conventional cream solder printing inspection apparatus, as shown in FIG. 4, due to the directivity of the illumination of the illumination means 23, 23, the reflected light of the inclined portion of the cream solder 2 is lined. As shown in FIG.
And as indicated by hatching in FIG.
There is an area P where the light does not return at 4 (3).

【0005】図2に示す場合、すなわちクリーム半田
2、ラインセンサー14(3)及び照明手段23,23
のいずれもの長手方向が平行である場合には、クリーム
半田2の両長辺に位置する傾斜部19の反射光がライン
センサー14(3)に入光せず、その分検出される半田
面積が小さくなる。
In the case shown in FIG. 2, that is, the cream solder 2, the line sensor 14 (3) and the illumination means 23, 23.
When the longitudinal directions of any of the above are parallel, the reflected light of the inclined portions 19 located on both long sides of the cream solder 2 does not enter the line sensor 14 (3), and the solder area detected by that amount is Get smaller.

【0006】図3に示す場合、すなわちクリーム半田2
の長手方向とラインセンサー14(3)及び照明手段2
3,23の長手方向とが直角関係となる場合には、クリ
ーム半田13の両短辺に位置する傾斜部20の反射光が
ラインセンサー14(3)に入光せず、その分検出され
る半田面積が小さくなる。
In the case shown in FIG. 3, that is, the cream solder 2
Longitudinal direction, line sensor 14 (3) and lighting means 2
When the longitudinal directions of 3 and 23 have a right angle relationship, the reflected light of the inclined portions 20 located on both short sides of the cream solder 13 does not enter the line sensor 14 (3) and is detected accordingly. Solder area becomes smaller.

【0007】図2と図3とを比較して明らかなように、
両者の間では検出される半田面積の減少割合いが異なる
ので、いずれか一方の場合に基いて判定基準面積を設定
すると、他方の場合におけるクリーム半田の面積の良否
の判定に誤りが生ずるという問題がある。
As is clear from comparison between FIG. 2 and FIG.
Since the decrease rate of the detected solder area is different between the two, if the judgment reference area is set based on either case, there will be an error in the judgment of the quality of the cream solder area in the other case. There is.

【0008】[0008]

【課題を解決するための手段】本発明は上記問題点を解
決するため、クリーム半田印刷されたプリント基板の上
方にラインセンサーを配すると共に、ラインセンサーの
両側にその長手方向に平行に1対の照明手段を配し、こ
れら照明手段によって照明した状態で前記プリント基板
をラインセンサーで撮像し、その映像信号による画像に
対して被検査部分の窓枠部を設定し、この窓枠部内の画
像を解析してクリーム半田の印刷状態を検査するクリー
ム半田印刷検査装置において、前記窓枠部内の画像より
クリーム半田パターンの面積を求める特徴抽出手段と、
照明手段の照明方向と検査対象であるクリーム半田の配
置された方向とに基き面積補正値を求め、このようにし
て求められた面積補正値、前記特徴抽出手段によって求
められたクリーム半田パターンの面積、及び予め設定さ
れた判定基準面積の3者に基きクリーム半田の面積の良
否を判定する半田面積判定手段とを備えたことを特徴と
する。
In order to solve the above problems, the present invention arranges a line sensor above a printed circuit board on which cream solder printing is performed, and a pair of line sensors are arranged on both sides of the line sensor in parallel with the longitudinal direction. The above-mentioned printed circuit board is imaged by the line sensor in a state of being illuminated by these illuminating means, the window frame portion of the portion to be inspected is set for the image by the video signal, and the image in the window frame portion is set. In the cream solder printing inspection apparatus for inspecting the printed state of cream solder by analyzing the above, a feature extraction means for obtaining the area of the cream solder pattern from the image in the window frame portion,
The area correction value is obtained based on the illumination direction of the illumination means and the direction in which the cream solder to be inspected is arranged, the area correction value thus obtained, and the area of the cream solder pattern obtained by the feature extraction means. , And a solder area determining means for determining whether the area of the cream solder is good or bad based on three preset determination reference areas.

【0009】[0009]

【作用】本発明によれば、照明手段の照明方向と検査対
象であるクリーム半田の配置された方向に基き面積補正
値を求め、この面積補正値と、実測によるクリーム半田
パターンの面積と、判定基準面積との3者に基きクリー
ム半田の面積の良否を判定しているので、照明の方向と
クリーム半田の配置方向によって生ずる検出面積の減少
割合いの相違を考慮して、クリーム半田の面積の良否を
正確に判定することができる。
According to the present invention, the area correction value is obtained based on the illumination direction of the illumination means and the direction in which the cream solder to be inspected is arranged, and the area correction value and the area of the cream solder pattern by actual measurement are determined. Since the quality of the area of the cream solder is judged based on three factors, the reference area and the area of the cream solder, considering the difference in the reduction rate of the detected area caused by the direction of the illumination and the arrangement direction of the cream solder, The quality can be accurately determined.

【0010】[0010]

【実施例】本発明の一実施例を図面に基いて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

【0011】図1において、1はプリント基板、2はプ
リント基板1上に印刷されたクリーム半田、3はカラー
ラインセンサーである。23,23はプリント基板1の
上方に配されたカラーラインセンサー3の両側に、その
長手方向に平行に配された1対の照明手段である。各照
明手段23は斜下方に光を照射し、プリント基板1上の
撮像面を照明する。
In FIG. 1, 1 is a printed circuit board, 2 is cream solder printed on the printed circuit board 1, and 3 is a color line sensor. Reference numerals 23 and 23 denote a pair of illumination means arranged on both sides of the color line sensor 3 arranged above the printed circuit board 1 and in parallel with the longitudinal direction thereof. Each illuminating unit 23 irradiates light obliquely downward to illuminate the image pickup surface on the printed circuit board 1.

【0012】5はラインセンサー3で撮像されたカラー
映像信号を受信して、このカラー映像信号の中で、予め
制御部9から与えられた半田の色の色分布内の色を呈す
る部分を半田部分と判断して、その部分を示す色抽出デ
ータを発信する色抽出手段である。
[0012] Reference numeral 5 receives a color image signal picked up by the line sensor 3, and in this color image signal, a portion exhibiting a color within the color distribution of the solder color given in advance from the control section 9 is soldered. It is a color extraction unit that determines a portion and transmits color extraction data indicating the portion.

【0013】6は、前記色抽出データを受信し、ノイズ
成分を平滑化する平滑化手段である。
Reference numeral 6 is a smoothing means for receiving the color extraction data and smoothing noise components.

【0014】7は、被検査部分の窓枠部を設定し、その
窓枠部内の平滑化された信号を平滑化手段6より取り出
し、検査対象であるクリーム半田パターンの面積と重心
とを求める特徴抽出手段である。
A feature of 7 is that the window frame portion of the portion to be inspected is set, the smoothed signal in the window frame portion is taken out from the smoothing means 6, and the area and the center of gravity of the cream solder pattern to be inspected are obtained. It is an extraction means.

【0015】8は半田面積判定手段であって、次のよう
な機能を備えている。すなわち照明手段23,23の照
明方向と、検査対象であるクリーム半田2の配置された
方向とに基き面積補正値を求め、このようにして求めら
れた面積補正値、前記特徴抽出手段によって求められた
クリーム半田パターンの面積、及び予め設定された判定
基準面積の3者に基きクリーム半田の面積の良否を判定
する。
Reference numeral 8 is a solder area determining means, which has the following functions. That is, the area correction value is obtained based on the illumination direction of the illumination means 23, 23 and the direction in which the cream solder 2 to be inspected is arranged, and the area correction value thus obtained is obtained by the feature extraction means. The quality of the area of the cream solder is determined based on the area of the cream solder pattern and the preset judgment reference area.

【0016】具体的には、前記面積補正値及び判定基準
面積は、各検査対象に対応して、予め制御部9に記憶さ
せていて、これらに基き半田面積判定手段8は、クリー
ム半田の面積の良否を判定する。そして、図2に示すよ
うに、クリーム半田2の長手方向と照明手段23,23
の長手方向が平行である場合には、検出されたクリーム
半田の面積Sが次の範囲にあるとき、「良」と判定す
る。
Specifically, the area correction value and the judgment reference area are stored in advance in the control section 9 corresponding to each inspection object, and the solder area judging means 8 based on these is the area of the cream solder. The quality of is judged. Then, as shown in FIG. 2, the longitudinal direction of the cream solder 2 and the illumination means 23, 23.
In the case where the longitudinal directions of are parallel to each other, when the area S of the detected cream solder is in the following range, it is determined as “good”.

【0017】Min−A≦S≦Max−A Max・・・判定基準面積の最大値 Min・・・判定基準面積の最小値 A ・・・傾斜部19に相当する面積 同様に、図3に示すように、クリーム半田2の長手方向
と照明手段23,23の長手方向とが直角関係にある場
合には、検出されたクリーム半田の面積Sが次の範囲に
あるとき、「良」と判定する。
Min-A.ltoreq.S.ltoreq.Max-A Max ... Maximum value of judgment reference area Min ... Minimum value of judgment reference area A ... Area corresponding to inclined portion 19 Similarly, FIG. As described above, when the longitudinal direction of the cream solder 2 and the longitudinal directions of the illuminating means 23, 23 are in a right angle relationship, when the detected area S of the cream solder is in the following range, it is determined as “good”. .

【0018】Min−B≦S≦Max−B Max・・・判定基準面積の最大値 Min・・・判定基準面積の最小値 B ・・・傾斜部20に相当する面積 上記AとBとの値が異なることにより、照明方向とクリ
ーム半田の配置方向とによって生ずる検出面積の減少割
合の相違を補正し、クリーム半田の面積の良否を正確に
判定することができる。
Min-B≤S≤Max-B Max ... Maximum value of judgment reference area Min ... Minimum value of judgment reference area B ... Area corresponding to slope 20 Values of A and B above The difference in the reduction ratio of the detection area caused by the illumination direction and the arrangement direction of the cream solder can be corrected and the quality of the area of the cream solder can be accurately determined.

【0019】[0019]

【発明の効果】本発明によれば、照明の指向性に影響さ
れずに、クリーム半田の面積の良否を正確に判定し、ク
リーム半田の印刷状態を正確に検査することができるク
リーム半田印刷検査装置を提供することができる。
According to the present invention, the cream solder printing inspection capable of accurately determining the quality of the area of the cream solder and accurately inspecting the printing state of the cream solder without being influenced by the directivity of the illumination. A device can be provided.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例の構成を示すブロック図。FIG. 1 is a block diagram showing a configuration of an exemplary embodiment of the present invention.

【図2】照明方向とクリーム半田の反射状態の関係を示
す原理図。
FIG. 2 is a principle diagram showing a relationship between an illumination direction and a reflection state of cream solder.

【図3】照明方向とクリーム半田の反射状態の関係を示
す原理図。
FIG. 3 is a principle diagram showing a relationship between an illumination direction and a reflection state of cream solder.

【図4】照明方向とクリーム半田の反射状態の関係を示
す概略側面図。
FIG. 4 is a schematic side view showing a relationship between an illumination direction and a reflection state of cream solder.

【図5】従来例を示すブロック図。FIG. 5 is a block diagram showing a conventional example.

【符号の説明】[Explanation of symbols]

1 プリント基板 2 クリーム半田 3 ラインセンサー 5 色抽出手段 6 平滑化手段 7 特徴抽出手段 8 半田面積判定手段 23 照明手段 1 Printed Circuit Board 2 Cream Solder 3 Line Sensor 5 Color Extracting Means 6 Smoothing Means 7 Feature Extracting Means 8 Solder Area Determining Means 23 Illuminating Means

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 クリーム半田印刷されたプリント基板の
上方にラインセンサーを配すると共に、ラインセンサー
の両側にその長手方向に平行に1対の照明手段を配し、
これら照明手段によって照明した状態で前記プリント基
板をラインセンサーで撮像し、その映像信号による画像
に対して被検査部分の窓枠部を設定し、この窓枠部内の
画像を解析してクリーム半田の印刷状態を検査するクリ
ーム半田印刷検査装置において、前記窓枠部内の画像よ
りクリーム半田パターンの面積を求める特徴抽出手段
と、照明手段の照明方向と検査対象であるクリーム半田
の配置された方向とに基き面積補正値を求め、このよう
にして求められた面積補正値、前記特徴抽出手段によっ
て求められたクリーム半田パターンの面積、及び予め設
定された判定基準面積の3者に基きクリーム半田の面積
の良否を判定する半田面積判定手段とを備えたことを特
徴とするクリーム半田印刷検査装置。
1. A line sensor is arranged above a printed circuit board printed with cream solder, and a pair of illuminating means is arranged on both sides of the line sensor in parallel to the longitudinal direction of the line sensor.
The printed circuit board is imaged by the line sensor in a state where it is illuminated by these illumination means, the window frame portion of the portion to be inspected is set for the image based on the video signal, and the image in the window frame portion is analyzed to measure the cream solder. In a cream solder printing inspection device for inspecting a printing state, a feature extraction means for obtaining the area of the cream solder pattern from the image in the window frame portion, an illumination direction of the illumination means, and a direction in which the cream solder to be inspected is arranged are arranged. A base area correction value is obtained, and the area correction value thus obtained, the area of the cream solder pattern obtained by the feature extracting means, and the preset judgment reference area A solder paste printing inspection device, comprising: a solder area determination means for determining quality.
【請求項2】 ラインセンサーがカラーラインセンサー
であり、このラインセンサーで撮像されたカラー映像信
号を受信して、このカラー映像信号の中で、予め与えら
れた半田の色の色分布内の色を呈する部分を半田部分と
判断して、その部分を示す色抽出データを発信する色抽
出手段と、この色抽出データを受信して平滑化処理を行
い、平滑化された信号を発信する平滑化手段とを備えた
ことを特徴とする請求項1記載のクリーム半田印刷検査
装置。
2. The line sensor is a color line sensor, receives a color image signal picked up by the line sensor, and in the color image signal, colors within a color distribution of a solder color given in advance. And a smoothing process for determining the soldered part and transmitting color-extracted data indicating the part, and receiving the color-extracted data to perform smoothing processing and transmitting a smoothed signal. The cream solder printing inspection device according to claim 1, further comprising:
JP17298392A 1992-06-30 1992-06-30 Cream solder print inspection equipment Pending JPH0618239A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17298392A JPH0618239A (en) 1992-06-30 1992-06-30 Cream solder print inspection equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17298392A JPH0618239A (en) 1992-06-30 1992-06-30 Cream solder print inspection equipment

Publications (1)

Publication Number Publication Date
JPH0618239A true JPH0618239A (en) 1994-01-25

Family

ID=15951998

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17298392A Pending JPH0618239A (en) 1992-06-30 1992-06-30 Cream solder print inspection equipment

Country Status (1)

Country Link
JP (1) JPH0618239A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08307741A (en) * 1995-05-02 1996-11-22 Matsushita Electric Ind Co Ltd Image pickup device
JP2007010497A (en) * 2005-06-30 2007-01-18 Ckd Corp Inspection device of substrate
WO2012108483A1 (en) * 2011-02-11 2012-08-16 株式会社Djtech Printed solder inspection device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08307741A (en) * 1995-05-02 1996-11-22 Matsushita Electric Ind Co Ltd Image pickup device
JP2007010497A (en) * 2005-06-30 2007-01-18 Ckd Corp Inspection device of substrate
WO2012108483A1 (en) * 2011-02-11 2012-08-16 株式会社Djtech Printed solder inspection device
KR101877592B1 (en) * 2011-02-11 2018-07-11 나고야덴키코교 가부시키가이샤 Inspection device

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