JPS63186158A - Short circuit inspecting method for printed wiring board - Google Patents
Short circuit inspecting method for printed wiring boardInfo
- Publication number
- JPS63186158A JPS63186158A JP62017077A JP1707787A JPS63186158A JP S63186158 A JPS63186158 A JP S63186158A JP 62017077 A JP62017077 A JP 62017077A JP 1707787 A JP1707787 A JP 1707787A JP S63186158 A JPS63186158 A JP S63186158A
- Authority
- JP
- Japan
- Prior art keywords
- wiring board
- liquid crystal
- short
- printed wiring
- circuit
- 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
Links
- 238000000034 method Methods 0.000 title claims description 7
- 239000004020 conductor Substances 0.000 claims abstract description 23
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 18
- 238000007689 inspection Methods 0.000 claims description 5
- -1 acryl Chemical group 0.000 abstract description 5
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 abstract description 4
- 239000006260 foam Substances 0.000 abstract description 4
- 239000004698 Polyethylene Substances 0.000 abstract description 2
- 229920000573 polyethylene Polymers 0.000 abstract description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 238000011179 visual inspection Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、印刷配線板の導体パターン間の短絡を見つけ
るための検査法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an inspection method for finding short circuits between conductor patterns on printed wiring boards.
従来の技術
従来より、布線検査機による検査の結果、導体パターン
間の短絡不良を発見した印刷配線板について、短絡の発
生原因を究明する目的で短絡箇所を見つけ出すことが行
なわれている。この場合、その手段として、目視あるい
は拡大鏡を使用する等肉眼による観察で短絡箇所を見つ
け出している。2. Description of the Related Art Conventionally, for printed wiring boards in which a short circuit between conductive patterns has been found as a result of an inspection using a wiring inspection machine, the short circuit location has been found in order to investigate the cause of the short circuit. In this case, the short-circuit location is found by visual inspection or observation with the naked eye using a magnifying glass.
発明が解決しようとする問題点
上記の目視あるいは拡大鏡を使用する等の肉眼観察によ
る短絡箇所の検出方法では、たとえ布線検査機により短
絡の発生した互いの導体パターンがわかっていても、配
線密度の高いパターンあるいは多数の導通穴を経由して
配線長が長くなっているパターンにおいては、短絡が微
細な場合、その検出に多大な時間を要するという ・
−問題点を有している。Problems to be Solved by the Invention The method of detecting short circuits by visual inspection or naked eye observation using a magnifying glass, etc., does not allow wiring In dense patterns or patterns with long wiring via many conductive holes, it takes a lot of time to detect short circuits if they are minute.
-There are problems.
本発明は、導体パターン間の短絡箇所の発見挾
を容易に行なえる印刷配線板の短絡Ｗ査法を提供するこ
とを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for inspecting short circuits on printed wiring boards, which allows easy detection of short circuits between conductor patterns.
問題点を解決するための手段
上記目的を達成するための本発明は、感温性液晶フィル
ムを印刷配線板の導体パターン上に載置し、回路が互に
独立している導体パターン間に電圧をかけて、前記感温
性液晶フィルムの色変化を観察するものである。Means for Solving the Problems In order to achieve the above object, the present invention places a temperature-sensitive liquid crystal film on a conductor pattern of a printed wiring board, and creates a voltage between the conductor patterns in which circuits are independent of each other. The color change of the temperature-sensitive liquid crystal film is observed.
作用
短絡を発見した印刷配線板において、まず、短絡が発生
した互いの導体パターン間に電源を接続する。続いて、
感温性液晶シートを印刷配線板表面上に密着させた後、
当該導体パターン間に電圧をかける。短絡の発生してい
る箇所は、周囲の導体部分に比較して導体幅が非常に小
さ／ い、、あ、え、Ｖ、、ヵ３□１．５５、□。In the printed wiring board where a short circuit has been discovered, a power source is first connected between the conductor patterns where the short circuit has occurred. continue,
After adhering the temperature-sensitive liquid crystal sheet to the surface of the printed wiring board,
A voltage is applied between the conductor patterns. The conductor width at the point where the short circuit occurs is very small compared to the surrounding conductor parts.
お６３よる発熱が大きい。そのため、短絡の発生してい
る箇所は温度が高くなり、印刷配線板の表面に密着させ
た感温性液晶シートは短絡の発生している圀所だけ異な
る色を示す。これによって、短絡箇所を容易に発見でき
るものである。I have a big fever due to 63. As a result, the temperature increases at the location where the short circuit occurs, and the temperature-sensitive liquid crystal sheet that is closely attached to the surface of the printed wiring board exhibits a different color only at the location where the short circuit occurs. This allows short-circuit locations to be easily discovered.
実施例 本発明の一実施例を第１図、第２図により説明する。Example An embodiment of the present invention will be described with reference to FIGS. 1 and 2.
第１図は検査状態を示す側面断面図、第２図は平面図で
ある。９は電源であり、電源９と被検査物である印刷配
線板８の導体パターン１１．１１′間をリード線１０．
１０′で接続する。導体パターン１１と１１′と接続す
るリード線１０．１０′の先端部分はピン状にしである
。短絡の発生した位置をわかりやす（するために方眼目
盛を入れた無色透明なアクリル板１と感温性液晶（コレ
ステリック液晶）フィルム３とを、透明性があり、かつ
クッション性のある軟質ポリエチレンシート２をはさん
で貼り合わせて形成した液晶板を感温性液晶フィルム３
が印刷配線板８に当接するように配置する。クッション
性が高（かつ容易にリード線１０．１０’のピンを差す
ことのできるウレタンフオーム６とアクリル板７を貼り
合せて形成したベース板を前記液晶板と蝶つがい５で連
結して、印刷配線板８を出し入れし易（してあり、液晶
板とベース板の間に印刷配線板を密着させる目的でクラ
ンプ４を備えている。FIG. 1 is a side sectional view showing the inspection state, and FIG. 2 is a plan view. Reference numeral 9 denotes a power source, and lead wires 10.
Connect at 10'. The tip portions of the lead wires 10 and 10' connected to the conductor patterns 11 and 11' are pin-shaped. A colorless and transparent acrylic plate 1 with a grid scale in order to easily identify the position where a short circuit has occurred and a temperature-sensitive liquid crystal (cholesteric liquid crystal) film 3 are connected to a soft polyethylene sheet that is transparent and has cushioning properties. Temperature-sensitive liquid crystal film 3
is arranged so that it is in contact with the printed wiring board 8. A base plate formed by bonding a urethane foam 6 and an acrylic plate 7, which have high cushioning properties (and into which pins of lead wires 10 and 10' can be easily inserted), is connected to the liquid crystal plate with a hinge 5, and printing is performed. The wiring board 8 can be easily taken in and out, and a clamp 4 is provided for the purpose of tightly fitting the printed wiring board between the liquid crystal board and the base board.
前記のベース板上に短絡を発見した印刷配線板８を置き
、短絡の発生した互いの導体パターン１１．１１′の始
点あるいは終点の穴にリード線１０のピンを差し込む。The printed wiring board 8 on which the short circuit has been found is placed on the base plate, and the pins of the lead wires 10 are inserted into the holes at the starting or ending points of the conductor patterns 11 and 11' where the short circuit has occurred.
印刷配線板８を貫通して突出したピンの先端はウレタン
フオーム６に埋設する。その後０液晶板を閉じて印刷配
線板８に ゛密着させ、クランプ４により液晶板とベー
ス板の間で締め付ける。The tips of the pins that protrude through the printed wiring board 8 are embedded in the urethane foam 6. Thereafter, the 0 liquid crystal plate is closed and brought into close contact with the printed wiring board 8, and the clamp 4 is tightened between the liquid crystal plate and the base plate.
電源９により短絡の発生した導体パターン１１．１１′
間に５Ａの電流を流した所、導体パターン間の短絡の発
生した箇所だけが変色するのがアクリル板１側から観察
された。Conductor pattern 11.11' where short circuit occurred due to power supply 9
When a current of 5 A was passed between the conductor patterns, it was observed from the acrylic plate 1 side that only the portion where the short circuit occurred between the conductor patterns changed color.
発明の効果
上述したように、本発明は、印刷配線板の導体パターン
間に電圧をかけて、短絡により導体温度の高くなった箇
所を感温性液晶フィルムの変色により知るという簡単な
方法により、従来目視によりおこなうでいたため長時間
を要していた導体パターン間の短絡箇所の検出を短時間
に行うことが出来、工業的価値極めて大なるものである
。Effects of the Invention As mentioned above, the present invention uses a simple method of applying a voltage between the conductor patterns of a printed wiring board and detecting the location where the conductor temperature has increased due to a short circuit by the discoloration of the temperature-sensitive liquid crystal film. This method can detect short circuits between conductor patterns in a short time, which was conventionally done by visual inspection, which took a long time, and is of great industrial value.
第１図は本発明の一実施例を示す断面図、第２図は同平
面図である。
３は感温性液晶フィルム、８は印刷配線板、９は電源、
１１．１１′は導体パターン第１図
第２図FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a plan view thereof. 3 is a temperature-sensitive liquid crystal film, 8 is a printed wiring board, 9 is a power supply,
11.11' is the conductor pattern Figure 1 Figure 2
Claims (1)
置し、回路が互に独立している導体パターン間に電圧を
かけて前記感温性液晶フィルムの色変化を観察すること
を特徴とする印刷配線板の短絡検査法。A temperature-sensitive liquid crystal film is placed on a conductor pattern of a printed wiring board, and a voltage is applied between the conductor patterns whose circuits are independent from each other, and a color change of the temperature-sensitive liquid crystal film is observed. short circuit inspection method for printed wiring boards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62017077A JPS63186158A (en) | 1987-01-27 | 1987-01-27 | Short circuit inspecting method for printed wiring board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62017077A JPS63186158A (en) | 1987-01-27 | 1987-01-27 | Short circuit inspecting method for printed wiring board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63186158A true JPS63186158A (en) | 1988-08-01 |
Family
ID=11933915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62017077A Pending JPS63186158A (en) | 1987-01-27 | 1987-01-27 | Short circuit inspecting method for printed wiring board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63186158A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297612A (en) * | 2014-08-04 | 2015-01-21 | 浪潮(北京)电子信息产业有限公司 | Method and device for detecting component giving rise to short circuit |
-
1987
- 1987-01-27 JP JP62017077A patent/JPS63186158A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297612A (en) * | 2014-08-04 | 2015-01-21 | 浪潮(北京)电子信息产业有限公司 | Method and device for detecting component giving rise to short circuit |
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