JPS6024089A - Method of displaying lot number in printed circuit board - 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, etc. in a preset display area at one end of a printed wiring board during the manufacture of a printed wiring board.

The printed wiring board is also called a printed circuit board, and generally a thin conductive material such as copper foil is bonded to the surface of a plate-shaped insulating material such as resin, and a desired pattern (: formed, wiring is performed, and predetermined soldered parts are It is manufactured by coating the entire surface with solder resist, printing one character, and then coating the entire surface with moisture-proofing and rust-preventing material as necessary, making it easy to fix electrical wiring and parts. It is compact within one board; it has the advantage of being able to combine two parts, making it suitable for the miniaturization and mass production of electronic application equipment, and is widely practiced. A widely used method is to print an electrical circuit on a resin laminate and then etch the copper outside the circuit (double melting).

For the above-mentioned implementation, a photographic method using a photoresist, a silk screen method, etc. are known. Next, the board on which the solder resist has been applied and the printing of one character, etc. has been completed is completed by drilling holes and applying a moisture-proofing and rust-preventing material.

On the other hand, in the above steps, it is necessary to include a step of displaying the manufacturing date or lot number (hereinafter abbreviated as lot number, etc.) of the substrate on the substrate. This is used as a means of both quality history management for manufacturers and service to users.

It has great utility value. For example, if a defective product occurs, check the manufacturing date, quality history, etc. from the board (= loft number attached, etc.) to clarify the cause of the defect, and immediately take measures such as checking other products. Adopt this to prevent the spread of accidents.

Damages suffered by manufacturers and users can be minimized.

Conventionally, when displaying the lot number etc. mentioned above.

A symbol method is adopted that simplifies the minimum necessary data, and a symbol is created by arbitrarily combining arithmetic numbers or alphabets, etc., and this is used to print or use a rubber stamp, etc., on one end of the crossroad product. The means are common. - For example, the symbol 1'-T-791201J indicates the manufacturer and manufacturing date as [T2 Tokyo Print Co., Ltd. J [79: 1979 J "1201: December 1st"]. However, this method requires human labor, so although it is possible when manufacturing a small number of @0 boards, it has the disadvantage of requiring a lot of effort when manufacturing a large quantity. Symbols that contain a mixture of letters, alphabets, etc., and that have a large number of fluctuations, such as dates of manufacture, have the disadvantage that it is necessary to replace the characters on the rubber stamp or printer each time.

The present invention improves the drawbacks of the conventional method for displaying lot numbers, etc. as described above, incorporates a method for displaying lot numbers, etc. into the manufacturing process, and further provides a display means mainly based on point display using dots. In order to achieve the above purpose (=, forming a conductive pattern on the substrate, and then applying the solder resist material to the designated area in (2) the display area). It is an object of the present invention to provide a method for displaying lot numbers, etc. on a printed wiring board, which is characterized by displaying loft numbers, etc. using dots.

The present invention (=the method of displaying loft numbers, etc.) will be explained in detail.The copper-clad laminate, which is usually used as a substrate, can be made of all materials such as paper phenol material, glass epoxy material, polyimide material, etc. The wiring pattern made of conductors is formed based on a pre-designed electric circuit by cutting the raw material substrate into a suitable size C.The above-mentioned forming means is performed by cutting the raw material substrate into two dimensions ( 2) The method of printing an electrical circuit and dissolving the copper outside the circuit by etching is used to obtain the wiring diagram. A detailed explanation will be omitted.A wiring pattern is formed, a solder resist is applied to the entire surface except for predetermined soldering parts, and
In addition to writing (Legend Marking) the name of the parts to be mounted on the board, other characters, symbols, etc. (Legend Marking), writing (Legend Marking) the lot number, etc. according to the present invention C2. This writing method will be explained using an example.This example shows a case where a screen printing means is used, and the first Figure C2 shows a schematic cross-sectional view of the screen. 1 is a thin mesh-like Q screen, and is supported by a frame 2 (2). The screen is usually made of silk or stainless steel, but 1 is made of a synthetic material such as polyester. Can be used 1
be. On one side of the screen 1, an emulsion 3 is used to form a writing pattern such as a lot number, mainly dots, by known means. An example of the above writing pattern is shown in the plan view of FIG.
The white areas other than the coated areas are the writing pattern, and the dot areas 5. Alphabet part 6. Arithmetic numeral areas 7 are divided and constitute image areas for transparent extrusion of ink, and emulsion 3 functions as non-image areas. When using the above screen to write on a display area such as a loft number set in advance on the board 1. Normal screen printing method (2. Therefore, rubber, squeezo etc. (2. Therefore printing ink is passed through the printing area) This is carried out by extrusion and printing.The writing process is performed by applying a solder resist or writing characters, symbols, etc. (Legend) during the formation of a conductive pattern in the manufacturing process of the board.
It may be carried out at any time during marking. Second
When writing using the writing pattern shown in the figure, Figure 3 ≦
Lot numbers, etc., are displayed mainly using dots as shown in the figure (- is inside the frame (alpha-pella marked as 2). rTJ is the initials of the manufacturer (Tokyo Printing Industry).
The arithmetic numeral "9" indicates "1979".

Similarly (a total of 31 dots in the box 8 and 9 are written to indicate "Day J", and a total of 12 dots in box 10 are written to indicate "Month". As will be explained later, for convenience in the actual writing operation,
The number of dots indicating the month and day is expressed by 12 minus number of display dots and 31 minus number of display dots, respectively, so the number of dots indicating the month and day in the above is 11. or 30 pieces is enough. If this is shown in FIG. 4, "Manufactured by Tokyo Print Co., Ltd., January 1, 1979" is displayed.

Although the above example shows the manufacturer and date of manufacture, it goes without saying that other display data can be shown. For example, the manufacturing lot number, a symbol indicating quality history, and others.

There are many variables in the lot number, etc., and for example, the manufacturing date is of course changed every day, but the present invention has the advantage that the above changes can be made very easily. It is something. In other words, the change in manufacturing date is the second
Erasing any dot portion 5 in the writing pattern shown in Figure 2 (= Therefore, it can be carried out. The erasing method is shown in Figure 1.
It is only necessary to prepare a pattern in which the dots to be erased are coated and erased using the same material as the emulsion 3 used to form the second writing pattern on the screen 1 shown in Fig. 2, and the operation is extremely simple. This is easy to do.When displaying the manufacturing date, all you have to do is erase one by one the dots in frames 8 and 9 that indicate day f' (Day). The dots in frame 10 indicating Mont, h) can be erased one by one at the beginning of each month.
does not change, and the arithmetic numeral "9" representing "year" remains unchanged for one year, so it can be used as is throughout the year.

In order to make the above display example clearer, other embodiments are shown from FIG. 5 onwards. In Figure 5, there are 11 dots in frame 10 indicating the month, so it is January (12-11), and there are 21 dots in frames 8 and 9 indicating "r day", so it is 10 days (31-11).
21), after all, 1'-manufactured on January 10, 1979", similarly, Figure 6 shows "manufactured on August 21, 1979", and Figure 7 shows "manufactured on December 30, 1979". Figure 8 shows "manufactured on January 2, 1980."

Note that the above embodiment uses the writing pattern example shown in FIG. 2, and the arrangement example may be arbitrarily changed in design, and it is also possible to add fixed alphabets, numbers, and other symbols. It goes without saying that there is one thing.

In addition, in the embodiment of the present invention, when displaying "month" and "day", the number of dots displayed per one display is subtracted from "31" and "12", respectively, and the display data is used. It is also possible to use a display method that matches the display of the "month" or "day" and is included in the scope gIi of the embodiments of the present invention.

The methods for displaying lot numbers, etc. on printed wiring boards according to the present invention have been explained in detail above. Two methods employ conventional display means using only symbols or numbers (instead, point display using dots is used). It is characterized by
It has many advantages as described below. That is,
Because the writing process of the lot number, etc. mentioned above can be incorporated into the printing process or baking process during the manufacturing process of printed circuit boards (regardless of whether the manufacturing loft is small or large).

It has no impact on cost and can be implemented, and has the characteristic that it can be displayed on all substrates.The above display (=Therefore, manufacturers can use it as a guideline for production management 1 and quality control. At the same time, on the U-day side (=), it also has the advantage of making lot management easier during product acceptance inspection, and manufacturing quality history etc. can be seen at a glance. (4) When entering data, use the simple operation of erasing unnecessary dots with emulsion) From 2.
All you have to do is change the writing pattern.

This saves you a lot of trouble. Therefore, most of the man-hours required when using conventional printers, rubber stamps, etc. are omitted, and a dedicated printing worker is not required. In addition, the time required to prepare for display changes is reduced, and the down time of the machine is reduced, resulting in improved machine efficiency. Furthermore, since the display is changed by the simple operation of applying emulsion to the dots of the pattern and erasing them one by one, display errors are less likely to occur.

Since the same pattern is used continuously for the same lot (2), printing irregularities that tend to occur during conventional manual work (2)
Display defects such as variations in shading do not occur, and uniform display quality is obtained.Since the five displays are performed using a simple round shape, the display can be performed clearly, and display errors due to blurring do not occur. or.

It is very economical because the same pattern is used, there is no need to replace cut letters, etc., and there are fewer consumables.It is also possible to reduce the cost of displaying loft numbers, etc., which reduces manufacturing costsC. The two are connected.

Only data from the above-mentioned variable factors 84 are displayed using dots, and non-variable factors such as manufacturer's name, year, model, etc. are displayed using arithmetic numerals as in the past.

Another feature of the present invention is that alphabets, symbols, etc. can be used as they are, or both can be used in combination, making it possible to improve the distinguishability of the service mark to the user ζ2. Although the embodiment has been described using a screen printing method as the display means, it is also possible to use other printing means.

The method for displaying lot numbers, etc. on the printed wiring board according to the present invention has been explained in detail above. By implementing a method of displaying loft numbers, etc., mainly using dot display in the display area (2), it is possible to achieve the various effects described above, and it is possible to Since it is easy to apply, it has great practical value.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a screen used in carrying out the method of the present invention, FIG. 2 is an open plan view showing a written pattern, and FIGS. 3 and 4 are plan views showing aspects of written display. , 5th
Figures 8 through 8 are examples showing other display modes. 1... Screen 2... Frame 3... Emulsion
4... Frame-shaped part 5... Dot part 6... Alphabet part 7...
Arithmetic numbers section 8, 9, 10... Frame patent Applicant Tokyo Print Kogyo Co., Ltd. Agent Patent attorney Michi Isono Ko;

Claims (1)

[Scope of Claims] When manufacturing a printed wiring board, one end (2 lot number The lot number, etc. is displayed using a dot display using two dots. The manufacturing date and other data are expressed by the number of .The above screen printing method is characterized by erasing the display dot pattern set in advance on the screen and changing the display contents such as the loft number. How to display loft numbers, etc. on wiring boards.