JPS5855710A - Displaying method for defect position - Google Patents

Abstract

PURPOSE:To discriminate the repair defects while a printed substrate is held covered with a defect displaying sheet by opening windows corresponding to the defect positions of the patterns on the printed substrate in the defective position displaying sheet. CONSTITUTION:The laser beams from a laser 3 are condensed via a beam expander 4, a rotary mirror 5, and a lens 6 onto the pattern 2 on a printed substrate 1. The reflected light is made incident via a lens 6, the mirror 5, a half mirror 7 and a lens 8 to a photodetector 9. The output thereof is binary coded with a comparator 11 via an amplifier 10. The entire surface of the substrate 1 is scanned by the movement of an XY table. The video signal thereof is processed with a defect detecting circuit 12, and the addresses of defects are stored in a memory 13. A controller 14 reads the addresses of the defects, and opens windows to a defect displaying sheet 21 by operating a puncher 20. The sheet 21 is superposed on the substrate 1, whereby the defects are discriminated and repaired as they are.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for indicating defect positions of patterns formed on the surface of a printed circuit board.

Many printed circuit boards are used in electronic computers, but in order to maintain the reliability of the printed circuit boards, the patterns formed during the manufacturing process are inspected to ensure that even the slightest defect remains, and all defects found are removed. Make repairs. Therefore, it is necessary to accurately display the position of the detected defect in the pattern. Conventionally, a defect display sheet with a [K mark] corresponding to the detected defect was created on the defect display V-), and this defect display sheet was The defects that should be corrected were identified on the pudding F board by job.

However, in this method, the defect display V-) is made of paper and is opaque.To identify the defect, hold your finger on the displayed mark and aim at the defect display V-). There is the inconvenience of having to search nearby areas to find defects, and also having to remove the defect indicator (V-) when repairing the defects found.

The purpose of the present invention is to solve the above-mentioned problems and to provide a defect position display method that can identify and repair defects while covering the defect display F-) on a printed circuit board. This is achieved by opening one window at a position corresponding to the detected defect on the defect display sheet.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining an embodiment of the defect position display method of the present invention, and also shows the system configuration of the defect position display device used.

In the figure, 1 is a printed circuit board to be inspected. A laser beam emitted from a laser 8 is once expanded by a beam expander 4, and then reflected by a rotating mirror 5 to form a pattern 2 on the printed circuit board 1.
Focus the irradiation on a minute spot. The light reflected by pattern 2 passes through lens 6 to rotating mirror 5 and half mirror 7.
The light is reflected by the lens 8 and formed into an image on the light receiving surface of the photodetector 9 . The photodetector 9 converts this into an electrical signal according to the intensity of the incident light, and sends it to the amplifier 11. The signal amplified by the amplifier 11 is binarized by the comparator 12 and converted into a 1 do or 0'' movie signal depending on the presence or absence of the pattern.

This operation is performed by rotating the rotating mirror 5 to move the laser beam irradiation position, and by moving the xY tape /L/ (not shown) on which the printed circuit board is mounted, to cover the entire surface of the printed circuit board 1. Do it against. In this manner, the entire surface of the printed circuit board 1 is scanned with a laser beam, and nine video signals corresponding to the pattern of the printed circuit board 1 are sent to the defect detection circuit 1B together with the address. Defect detection circuit IB
performs a predetermined logical operation based on the input video signal to detect pattern defects and their addresses, and stores them in the address register 18. Note that here, A indicates a defect detection means.

When the inspection of the entire surface of the printed circuit board l is completed, the controller 14 reads out the address of the defect stored in the address box 18 and operates the puncher 90 to open a window in the defect display sheet 10. do.

The defect display S/-) puncher 20 has a defect display S/-) 81
loaf 22. ! 2B, defect indication sheet) BIK
I! A bunch 84 for opening the bunch g4, a support section 25 for supporting the bunch g4, a feed cine sps'r for moving the support section 26 on the guide bar g6 in a direction perpendicular to the plane of the paper, and a punch drive section 28. Roller drive unit 29, feed screw drive unit 80
It is configured with the following.

The controller 14 operates the roller drive unit 29 and the feed screw drive unit 30 in accordance with the address of the defect that has been read out to accurately position the bunch 24 at the location corresponding to the address of the defect on the defect display sheet 21. . Then, the punch drive unit 28 is operated to display the defect display sheet 21.
Open the nitrogen. Windows are opened corresponding to all of the defects thus detected.

The perspective view in Figure 2 shows the defect display F created in this way.
-) This is a diagram showing the printer 1 board corresponding to 21, and 81 is an opened window. The defect display sheet 21 and the printed circuit board 1 each have a guide hole fi/82 for positioning.
and 88 are provided. So this guide hose μ8
2. Place the defect display sheet 21 on top of the printed circuit board 1 by inserting a guide bin (not shown) into the 88, or the like, so that the defect display sheet 21 is properly aligned.

Then, as shown in FIG. 8, the defect 84 of the pattern 2 of the printed circuit board 1 is exposed at the window 31. In the diagram! ! Although only one defect 81 and one defect 84 are shown, even if there are two or more defects, a window will be opened corresponding to each defect. I can do 3. Moreover, since the defect is exposed at the edge p as described above, repair can be performed by covering the defect display sheet 21.

As explained above, the present invention makes it possible to visually identify and repair defects in patterns formed on the surface of printed circuit boards by covering them with defect display sheets, making pattern repair work easy and reliable, and increasing the reliability of printed circuit boards. will improve.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram showing one embodiment of the present invention;
8 shows a defect display V created according to the above embodiment.
-) and a top view. In the figure, 1 is a printed circuit board, 2 is a pattern, 18 is an address plate, 14 is a controller, 20 is a defect display sheet puncher, 21 is a defect display sheet, 81 is a nitrogen layer, 3
4 indicates a defect, and A indicates a defect detection means. Town law flute 2

Claims (1)

[Claims] Comprising a defect detection means for recognizing a defect in a pattern to be inspected and detecting its position address, and an address memory for storing the detected defect position address, reading out the defect position address stored in the address memory, A printed circuit board is inspected using a defect detection device that sends a signal indicating a defect position on the pattern to be inspected, and a window corresponding to a defect in the pattern of the printed circuit board is displayed on a defect position display sheet according to an output signal indicating the defect position. A defect position display method characterized by opening an opening.