JPH04254391A - Printed wiring board - Google Patents

Abstract

PURPOSE:To enhance the strength of a punch which press-punches a hole and minimize the damage to said punch during punch work by boring a square-shape hole at the intersection of dividing grooves to obtain a small printed wiring region. CONSTITUTION:Square-shaped holes 3a are bored at the intersection of dividing grooves 2 in the boundary between printed wiring region groups 1 or a dummy region 4 and the printed wiring region 1 where a plurality of square-shaped regions where a printed wiring pattern is formed on the surface are laid out crosswise. This punched hole is oriented so that the groove may match the diagonal of the punched hole 3a. The corner section of this punch hole 3a, if available as stated above, forms a right angle. It is, therefore, possible to enhance the strength of a punch which press-punches a hole and protect the punch from any damage during punch work.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an insulating substrate on which a plurality of rectangular regions on which a printed wiring pattern is formed are arranged vertically and horizontally, and dividing grooves are formed at the boundaries of the regions. , relates to a printed wiring board that is separated by the groove to form a plurality of printed wiring boards.

0002

[Prior Art] In general, this type of printed wiring board was developed with a focus on reducing the cost of printed wiring, standardizing circuit patterns, and versatility. were simultaneously printed, and a V-shaped groove, for example, was formed at the boundary dividing these patterns, and the paper was folded and divided at the groove as necessary for use.

FIGS. 3 and 4 are partial plan views of a conventional printed wiring board. For example, as shown in FIG. 3, two printed wiring areas 1 are formed adjacent to each other on one insulating substrate, and an unnecessary dummy area 4 is formed next to the printed wiring area 1, and a boundary dividing these areas is formed. Some have a V-shaped dividing groove 2 formed therein. Further, this printed wiring board has a triangular hole 3 at the intersection of the grooves 2 so that it can be easily broken when the printed wiring board is divided along the grooves. Additionally, the direction and position of this hole 3 are such that one side of the triangular hole touches the groove on the dummy area 4 side so that no cracks occur on the necessary printed wiring area 1 side when dividing. . Furthermore, if there are a large number of such holes, a press mold is used to make them.

On the other hand, when the number of holes to be drilled in the printed wiring board shown in FIG. 3 is small, as shown in FIG. 4, triangular holes 3c are formed by machining, for example, by cutting the insulating substrate with an end mill cutter. Further, when the dummy area is a printed wiring area that cannot be discarded, a round hole is made at the intersection to save man-hours.

[0005]

[Problems to be Solved by the Invention] However, when the shape of the loophole made to facilitate division of the printed wiring board is a triangular loophole as shown in FIG. 3, the punch for punching is small, and Because the corners are acute, the punch is not strong enough, and the punch often breaks or breaks. This not only increases the degree of wear and tear of the punches, but also lowers the yield rate of printed wiring boards and increases costs. Also, as shown in Figure 4,
Due to the influence of the cutter during machining, the corners are formed into a rounded shape. If this corner is rounded, a protrusion of the rounded part will remain on the corner of the small printed wiring board that has been cut off.
It will get in the way when installing the printed wiring board on the device, so do not
There is a problem in that the corners require chamfering correction processing.

[0006]An object of the present invention is to provide an inexpensive printed wiring board that can be easily divided into parts by changing the shape and direction of the holes drilled in order to solve this problem.

[0007]

[Means for Solving the Problems] The printed wiring board of the present invention includes:
An insulating substrate on which a plurality of rectangular areas on which a printed wiring pattern is formed are arranged in a row and a row, dividing grooves are formed at the boundaries of the areas, and square holes are formed at the intersections of the grooves. It is characterized by the fact that it is clear. Further, the direction of the square hole is such that the diagonal of the hole and the groove are aligned, or the direction of the square hole is such that the sides of the hole and the groove are parallel to each other.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a partial plan view of printed wiring showing an embodiment of the present invention. In this printed wiring board, as shown in FIG. 1, a square hole 3a is formed at the intersection of the dividing grooves 2 at the boundary between the printed wiring areas 1 or between the dummy area 4 and the printed wiring area 1. And this loophole 3a
The diagonal line of this loophole 3a and the groove 2 should be aligned in the same direction. With such a loop hole 3a, the corners will be at right angles, the strength of the punch will be high, and the punch will not chip or break.

Furthermore, even if this printed wiring area 1 is divided into small printed wiring boards, the corners of the printed wiring boards will be as if they had been chamfered, eliminating the need for chamfering after division, further reducing costs. I can expect it. Furthermore, when used as a large printed wiring board without being divided, this hole can also be used as an escape hole for fixing screws, so there is an advantage that there is no need to prepare mounting holes in advance.

FIG. 2 is a partial plan view of a printed wiring board showing another embodiment of the present invention. As shown in the figure, in this printed wiring board, the square loophole 3b is oriented in the direction of the loophole 3b.
The side b and the groove 2 are made parallel, so that the area on both sides equally includes the position of the loophole 3b. Even if the printed wiring board in this example is divided into smaller printed wiring boards, a square notch corresponding to 1/4 of the loophole remains at the corner, so this square notch is used for fixing. It can be used as an escape hole for screws. Therefore, there is an advantage that there is no need to process escape holes at all.

0012

Effects of the Invention As explained above, the present invention improves the strength of the punch for press-punching the holes by making square holes at the intersections of grooves that divide into small printed wiring areas, thereby improving the strength of the punch for punching the holes. , the punch will no longer be damaged. Moreover, by making the shape of the loophole square and making the area on both sides equal, it becomes unnecessary to modify the corners of the printed wiring board after it is divided. Therefore, according to the present invention, it is possible to obtain an inexpensive printed wiring board that is easy to attach to a device.

[Brief explanation of the drawing]

FIG. 1 is a partial plan view of printed wiring showing an embodiment of the present invention.

FIG. 2 is a partial plan view of a printed wiring board showing another embodiment of the present invention.

FIG. 3 is a partial plan view of a printed wiring board showing a conventional example.

FIG. 4 is a partial plan view of a printed wiring board showing a conventional example.

[Explanation of symbols]

1 Printed wiring area 2 Groove 3, 3a, 3b, 3c Loophole 4 Dummy area

Claims (3)

[Claims] 1. An insulating substrate on which a plurality of rectangular regions on which printed wiring patterns are formed are arranged in rows and columns, dividing grooves are formed at the boundaries of the regions, and dividing grooves are formed at the intersections of the grooves. A printed wiring board characterized by having square holes drilled in it. 2. The printed wiring board according to claim 1, wherein the direction of the square hole is such that a diagonal line of the hole coincides with the groove. 3. The printed wiring board according to claim 1, wherein the square hole is oriented such that the sides of the hole and the groove are parallel.