JPS58132648A - Automatic inspecting method for printed plug board and device thereof - Google Patents

Abstract

PURPOSE:To display a difference between a board to be measured and a reference plug board as a TV picture, to enable saving of manpower and labor required for a quality inspection, and to perform an automatic, high-precise, and rapid inspection, by a method wherein a subtraction takes place between the video signal of the board to be measured and the video signal of the reference plug board already stored. CONSTITUTION:A visual picture producing means 1 consists of a reference plug board 2 serving as a reference of inspection, a plug board 3 to be measured serving as an inspection object, and illuminating sources 4a and 4b. Pattern information of the boards 2 and 3 are photographed by a TV photographing means 5, and digital video signals DVa thereof are stored in a memory 8. A read-out signal RV read and a video signal VDb from the means 5 are fed to subtracting means 9, a subtraction is conducted between the two signals, and the obtained video signal is applied to a TV display means 10 to display a difference between the boards 2 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a mark 111 that automatically images a pattern formed on a wiring board and performs quality inspection.
JT#i! , an automatic inspection method for M plates, and #fK for implementing this method.

Generally, printed wiring boards are made by attaching steel foil to a rim plate and performing etching to form a pattern shape corresponding to a control system using the steel foil to form circuit lines. and,
This type of printed wiring board is inspected for its quality by checking the spacing between the buttons and patterns.

Inspection includes checking whether the width is sufficient, whether there are any gaps, wire breaks, etc.

Conventionally, when performing pattern sound detection on such a marking board, a method has generally been adopted in which the test is performed visually using an illuminated magnifying glass.

For this reason, there is a one-point variation in the severity of defective firings depending on the inspector, a decrease in f#ma due to fatigue, and a decrease in the false detection Tj rate. Furthermore, in recent years, printed wiring boards have become more densely patterned.
It can be said that human inspection has reached its limits, and efforts are being made to automate and improve the n-degree in this field. In addition, some machines have been devised, but
The comparison process is still performed manually and requires a great deal of effort and time when testing a large number of I11 wiring classes.

In view of the above points of the present invention, the present invention has been made to solve such problems and eliminate two deficiencies.The purpose is to save manpower and labor when inspecting the quality of printed wiring boards. An automatic inspection method for printed wiring boards that can automatically and quickly inspect high-precision fKL, and this method 1! The objective is to provide a device for performing

In order to achieve such an objective, the printed wiring board (reference wiring 1f) which is the reference of the present invention is imaged, the pattern information is stored in a digital memory system as a video signal of the television field, and then By performing subtraction between the video signal of the board to be inspected obtained by imaging the board to be inspected and the previously stored video signal of the reference board, the difference between the reference board and the board to be inspected can be calculated on the TV. It is displayed as John Wei, and it is the town meeting that recognizes the difference J! (deficiency) at once.

Embodiments of the present invention will be described in detail below based on the drawings.

The figure shows a printing arrangement 11ii according to the present invention! Automatic board inspection method and Ikf implementing this method! FIG. 2 is a configuration explanatory diagram for explaining one embodiment of II. In the figure, reference numeral 1 denotes a visible image generating means for converting pattern information of a printed wiring board into a visible image, and this visible image generating means 1 includes a reference wiring 1112 serving as a standard for inspection and a wiring to be inspected as an inspection target. Board 3 (hereinafter,
(abbreviated as a board to be inspected) and illumination light sources 4m and 4b. Here, the reference wiring board 2 and the board to be inspected 3 are replaced and installed manually or automatically.

Reference numeral 5 denotes a television imaging means for photographing pattern information of the printed wiring board (reference wiring board 2 and board to be inspected 3) by the visible image generating means 1, and this television imaging means includes a 5Fi television camera. An analog-to-digital converter (hereinafter referred to as
8/D cost converter) 7.

8 This is a digital storage means for accumulating the digital information aDva from the television imaging means 5, and is constituted by a digital memory. The reproduced video belief iv read out from the digital memory of the digital storage means 8 is inputted to one input terminal of the subtraction means 9, and the other input terminal of the subtraction means 9 is inputted to the above-mentioned television. The newly incoming digital video signal Dvb from the camera is directly inputted, so that the reproduced video signal V previously stored in the digital memory and the newly incoming digital video signal Dvb are combined.
A subtraction is performed between the two and outputs the video difference.

The video difference signal VD from the chick jr means 9 is input to the television display means 10. Here, this television display means 10 is not available (VD), $
Semi-wiring board! The above video transmission 4i! It is comprised of a digital-to-analog converter (hereinafter abbreviated as '/' converter) 11 and 12 buttons for converting the VD to analog video.

Next, the operation of the embodiment shown in this figure will be explained.

In order to inspect the printed wiring board, first, the reference wiring board 2, which will serve as the reference for the inspection, is installed at a predetermined position, and aF! A#
! The pattern information of the reference wiring board 2 is visualized by a light source 4 a m 4 b K, also known as an illumination stone.

This visible image is converted into a television field consisting of a series of video signals by a television camera 6, and converted into digital video signals DV and KW by a /D converter 7. This digital video signal DV
@p is digital storage means 8 (digital memory) k
Therefore, the digitally stored and reproduced video signal R
It is read out repeatedly as V. The reproduced video signal RVIfl is inputted to one input terminal of the RVIfl reduction means 9. Through the above operations, the video signal representing the pattern information of the reference wiring board 2 is stored and repeatedly reproduced.
This means that

Next, a printed wiring board to be inspected, that is, a board to be inspected 3 is installed in place of the reference wiring board 2, and the visible image generating means 1 and the television imaging means 5 perform the same operation as the above-mentioned linking. is carried out, and the incoming digital video signal (DVI) is obtained at the output of the 4-quality converter 7.

Then, by directly inputting the digital video signal Dvb of the newly incoming inspected board 3 to the other input terminal of the subtracting means 9, it is combined with the reproduced video signal Rv that has been previously stored and read out. A subtraction is performed between them to produce a video difference signal VD.

This video difference signal VD is introduced into the television display means 10, converted into an analog video difference signal ^vo KV by the -converter 11, and inputted to the television display 12. The visible television difference iiiiigI representing the difference from the test '*'M3 is displayed.

That is, the difference (defect) between the reference wiring board 2 and the inspected #f73 is instantly displayed on the television display W&12Kj! shown.

As is clear from the above 12 points, according to the present invention, there is no need to rely on conventional manual operations, so it is not only possible to solve all the inconveniences caused by this, but also to Since inspections such as the spacing between patterns on printed wiring boards and the presence or absence of disconnections are automatically performed, it is possible to automate the conventional pattern inspection of printed wiring boards by humans, thereby reducing inspection costs. The practical effects are extremely large, since it is possible to reduce manpower and labor, and to obtain products with extremely high reliability. In addition, it eliminates the unevenness of manual defect detection, does not require inspection experience or special techniques, improves the reliability of inspection results, and significantly shortens inspection time. In addition, it is now possible to inspect printed wiring boards with high-density patterns extremely easily and with high precision, thereby improving the manufacturing quality and reducing costs of printed wiring boards. It is extremely effective in that it can be used.

As described above, FUJIK has a great effect compared to conventional methods of this type and *WIIK, and V! This is a unique device.

[Brief explanation of the drawing]

The figure is a configuration explanatory diagram showing an embodiment of the automatic inspection method for test food and its apparatus according to the present invention. 0... Television imaging means, 8... Digital storage means (digital memory), 9... ...Subtraction means, 10...Television display means, patent 1 person: Nippon Avionics Co., Ltd. Agent: Masaki Yamakawa (and 1 other person)

Claims (1)

[Scope of Claims] α) Irradiating the reference wiring ifi with visible light to generate a visible image, converting the visible image into a television field consisting of a series of video signals, and converting the video signal into a digital The method comprises a step of memorizing and retrieving the information stored and read out, and a second step of installing a wiring board to be inspected in place of the reference wiring board to obtain a newly incoming video message. A subtraction is performed between the reference video signal and the incoming test board bias signal to generate a video difference signal, and the video difference signal is applied to the reference wiring board and the test board. Visible television differences showing the difference between ikigll! 1. An automatic inspection method for an Inkyo wiring board, characterized in that the method is configured to convert the Inkyo wiring board into (2) A means for generating a visible image of pattern information by irradiating a reference wiring board with visible radiation, and a television for converting the visible image obtained by this means into a television field consisting of a series of video signals. a digital storage means for digitally storing and reading out the video signal; and replacing the video signal stored in the digital storage means and the reference wiring board with the wiring board to be inspected. Perform a subtraction between the new video evidence coming from K
II calculation means, and television display means for converting the video difference signal obtained by the subtraction means into a visible television screen difference image representing the difference between the reference 1-wire board and the wiring board to be inspected. Automatic inspection of printed wiring boards characterized by: