JPS60192383A - Log number indicating method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for displaying a lot number provided on a printed wiring board.

Generally, printed wiring boards, which are made of ceramic, resin, enamel, or the like with a pattern, are marked with the manufacturing date and lot number, and are used for process control and quality control of the printed wiring boards.

Traditionally, cylinder wiring boards have these dates of manufacture.

Two numeric characters are provided to display lot numbers and the like.

Here, the conventional display method will be explained with reference to FIG.
Manufactured in November 1983, when displaying lot number 2, as shown in the figure, minus 1 and the last digit of 1983 are displayed as 3. Next, November is expressed in decimal numbers (1, 2, 3,
4-, 5, 6, 7, 8.

9, A, B, C) and expressed as B. moreover,
- Since a large number of lots are produced within a day, it is necessary to display the lot number representing the lot to which the relevant wiring/turn belongs. For example, lot numbers are usually expressed using two-digit Arabic numerals.

As shown in FIG. 1, it is indicated as 02. (Due to the narrow area, the limit is 2 digits.) By the way, 2. When printing a lot number on a printed wiring board, one unit of manufacturing date,
An original plate with a stamped number is used. Therefore, in the conventional method of displaying lot numbers, when the lot number is changed, the original plate must be discarded even though the original plate is not completely intact, which is very uneconomical. Unfortunately, the area for displaying the lot number is very limited (narrow), so 2.
There is also the problem that it is not possible to obtain a large number of digits.

An object of the present invention is to provide a lot number display method that does not require discarding a lot number display original plate even if the lot number changes.

Another object of the present invention is to provide a display method for displaying lot numbers in a simple manner.

According to the present invention, there is provided a method for displaying a lot number representing a lot of the board on a printed wiring board, the area being divided into predetermined areas on the cylinder wiring board. There is obtained a lot number display method characterized in that the lot number is displayed by providing a plurality of marks and sequentially erasing the plurality of marks every four l-.

The present invention will be described below based on embodiments shown in the drawings.

First, with reference to FIG. 2, for example, when printing a lot number etc. in a predetermined area of a printed wiring board (not shown) manufactured in January 1984, the printed wiring board - The last digit of 1984, 4, is printed and 2
Next, 1 is printed as a decimal number.

Is displayed.

As shown in the figure, marks in 3 rows and 3 columns (9 marks in total) are incorporated into the original plate. Therefore, using this original version,
f If you print the lot number on the IJT wiring board,
Nine marks will be printed on the f IJ point wiring board. Here, when all nine marks are applied, the lot number is set to 1 (FIG. 3(a)). In addition,
Marks are applied only to areas where the printing paste does not have a mother turn on the cylinder wiring board.

Now, all printed wiring boards are marked with the 9m mark as described above. If the lot number is 1, it can be left as is. When changing the lot number to 2 1 For example, as shown in Figure 3 (b) of the coffin, apply a plate-making agent to the first row and first column to erase the mark.

Next, when changing the lot number to 3, apply a plate-making agent to the first row and second column, as shown in Figure 3(c).

Erase the mark. Furthermore, when replacing No. II with No. 4, apply plate-making agent to the mark in the first row and third column, as shown in Figure 3(d). Therefore, there are 91 marks in total, so by erasing one mark, 10 mark patterns are created, 1 to 1.
It is possible to represent up to ten lot numbers.

Next, the lot number can also be represented by erasing two of the nine marks using a mark pattern as shown in FIG. 3(e) to <1> (see FIG.
Examples e) to V) show some examples of erasing two marks. ).

Therefore, in the description of each mark, the case where the number of marks is nine has been explained.

It is clear that the number of marks can be increased or decreased as appropriate.

However, the marks are not limited to those shown, for example.

It may also be in the form of dividing a circle.

As explained above, according to the present invention, there is no need to discard the lot number display original plate even if the lot number changes as in the past, and a simple method for displaying the lot number can be provided. . Furthermore, even if the area for displaying the lot number is limited, it is possible to display one more digit than in the past.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the conventional lot number display;
The figure is a diagram showing the lot number display according to the present invention, and FIGS. 3(a) to 3(t) show the lot number display according to the present invention.
FIG. 1...year, 2...month, 3...lot number, 4...
·mark.

Claims (1)

[Scope of Claims] 1. A method for displaying a lot number representing a lot of the board on a printed wiring board, the method comprising dividing the area into a predetermined area on the cylinder wiring board. Set up multiple marks so that A lot number display method characterized in that the lot number is displayed by sequentially erasing the plurality of marks for each lot.