JPS58303Y2 - printed wiring board - Google Patents

Description

[Detailed description of the invention] The present invention relates to a printed dashed line board on which a halftone dot pattern corresponding to the quadruple pattern is printed on the insertion surface of, for example, the leg of an electrical component. The purpose is to make it easier to see.

A conventional printed wiring board of this kind is shown in FIGS. 1A and 1B, and FIG. Figure B is this first
FIG. 2 is a perspective view of a main part taken along cutting line A-A' in FIG. A;

Reference numeral 1 denotes an opaque or translucent substrate made of an insulating material such as a paper-based phenol laminate, and holes 2 are provided in desired positions of the substrate 1 into which legs of electrical components (not shown) are inserted.
are perforated by press working etc.

Reference numeral 3 designates a conductive pattern made of, for example, copper foil, which is formed on the terminal connection surface 1b, which is one surface of the substrate 1, and is shaped by, for example, an etching method, a die stamping method, etc., and is inserted into the hole 2. It is used to electrically connect the legs of electrical components.

Reference numeral 7 denotes the terminal connection surface 1b, and a solder resist made of melamine resin or the like is applied to areas other than the soldering areas such as near the hole 2 to prevent solder from adhering.

Reference numeral 1a denotes the other surface of the substrate 1, which is generally a surface into which legs of electrical components and the like are inserted.

Reference numeral 4 denotes a halftone dot pattern consisting of halftone dots 4' printed on this insertion surface 1a by silk screen printing or the like, and substantially corresponds to the conductive pattern.

5 and 6 are circuit symbols and rating symbols printed on the insertion surface 1a by silk screen printing or the like, and are generally printed after the halftone pattern 4 is printed.

When such a conventional printed wiring board is viewed from the insertion surface 1a, it is as shown in FIG. , a conductive pattern 3 corresponding to the halftone pattern 4
It was difficult to understand what was going on.

In particular, when service personnel repair electrical equipment, etc., they often work in somewhat dark places, and this type of printed wiring board
There was a problem in the operation that it was confusing when following the conductive pattern 3 from the insertion i1a.

The present invention eliminates these problems, and will be explained with reference to the drawings. Figure 2A is a plan view of the main part of a printed wiring board showing an embodiment of the present invention, seen from the component insertion surface, and Figure 2B 2 is a perspective view of the main part taken along the line BB' of FIG. 2A.

In these figures, the same parts as in FIGS. 1A and 1B are designated by the same reference numerals.

Reference numeral 4a denotes a contoured area bordered by a solid line, in which a halftone dot pattern 4 that almost corresponds to the conductive pattern 3 printed on the insertion surface 1a of the leg of the electrical component, etc., is printed simultaneously with the halftone dots 4' by, for example, silk screen printing. It is what was done.

Here, an example of a method for producing a film used when simultaneously silk-screen printing the halftone pattern 4 and the outline portion 4a on a printed wiring board will be explained in sequence based on FIGS. 3A to 3F. become that way.

1. FIG. 3A is a film that has been used to photograph a printing plate for a conventional conductive bar multi-turn 3, and this film is used to create a negative film as shown in FIG. 3B.

2 From the negative film shown in FIG. 3B, a slightly reduced positive film as shown in FIG. 3C is made.

This slightly reduced positive film shown in Figure 3C is obtained by increasing the exposure time from the normal exposure time.
By appropriately selecting the length of the exposure time, the thickness of the solid line in the contour portion can be set to a desired thickness.

3 The positive film shown in this Figure 3C and the above-mentioned Figure 3BK
A film as shown in the third diagram is created by combining the negative film shown in FIG.

4. Create a positive film as shown in Figure 3E from the film shown in this third diagram.

5 By combining the positive film shown in Fig. 3E and the conventional halftone pattern film, the third
It is possible to create a film with a halftone pattern such as the one shown in Figure Fk, in which the outline is bordered by solid lines.

This finished film is extremely convenient because it can easily print a halftone pattern whose outline is outlined with solid lines on a printed wiring board.

With the film thus prepared, it is possible to easily and reliably print a halftone pattern having a contour outlined with a solid line as shown in FIGS. 2A and 2B on a printed wiring board.

In the above-described embodiment, the outline of the halftone pattern was formed by printing at the same time as the halftone dots, but it goes without saying that the outline of the halftone pattern may be formed by hand.

As detailed above, in the printed wiring board of the present invention, the outline of the halftone pattern is edged with a solid line, so the halftone pattern is easy to see, and the pattern can be easily identified in thin parts or places with narrow intervals. When a serviceman repairs an electrical machine or the like, there is an effect that it is less troublesome to follow the conductive pattern from the part insertion surface even in a slightly dark place.

In addition, the halftone pattern is easy to see, so when assembling printed wiring boards, when workers insert the legs of electrical components into printed wiring boards, there are fewer incorrect insertions, which improves work efficiency. There is also.

[Brief explanation of drawings]

Figure 1A is a plan view of the main parts of a conventional printed wiring board viewed from the component insertion surface, Figure 1B is a perspective view of the main parts taken along cutting line AA' in Figure 1A, and Figure 2A. FIG. 2B is a plan view of the main parts of a printed wiring board showing an embodiment of the present invention as seen from the component insertion surface.
2A is a perspective view of a main part taken along the cutting line BB' of FIG. 2A, and FIGS. 3A to 3F are explanatory diagrams showing an example of the method for producing the silk screen printing film of the present invention. 1... Board, 1a... Insertion surface, 3...
... Conductive pattern y, 4 / ... Halftone dot, 4...
...Hatting pattern, 4a... Contour part.

Claims (1)

[Scope of utility model registration request] A printed wiring board in which a conductive pattern is provided on one surface and a halftone pattern substantially corresponding to the conductive pattern is printed on the other surface, the outline of the halftone pattern being outlined with a solid line. wiring board.