JPH02260687A - printed wiring board - Google Patents

Abstract

PURPOSE:To enable the visual confirmation of the width and positional deviation of a V-groove by a method wherein a copper foil pattern whose width varies in stages in bilateral symmetry about a predetermined line is formed on it through etching, where the V-groove is provided to the predetermined line. CONSTITUTION:An electric conductor pattern is formed on the surface of an insulator 2, and a copper foil pattern 3 used for the check of the V-cut groove is formed at a prescribed position on the insulator 2 of a printed wiring board 1 with the electric conductor pattern. The copper foil pattern 3 is provided onto a predetermined line 3' onto which a V-cut processing is carried out and formed into such a shape that its width varies in states in bilateral symmetry about the predetermined line 3'. The peripheral side of the insulator 2 which the predetermined line 3' intersects is cut out into a V shape to form a cutout 5 whose apex is coincident with the predetermined line 3'. By this setup, a formed V-cut can be visually checked in width and positional deviation by the residual shape of the copper foil pattern 3 subjected to a V-cut processing.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a printed wiring board in which the width and positional deviation of a V-cut groove formed on the printed wiring board can be easily inspected visually.

<Prior art> Figure 4 (,) is a plan view of the main part of a printed wiring board that has been cut, and Figure 4 (b) is a side view thereof. An insulator that serves as the base of the wiring board 1; 4 is a cut groove formed on the surface of the insulator 2; 5 is a chevron-shaped notch cut out on the side of the insulator 2 where the cutting process is to be performed; be. Conventionally, V-cutting has been performed at desired positions on printed wiring boards as necessary.

<Problems to be Solved by the Invention> In the printed wiring board that has been subjected to the conventional V-cut process described above, ■ Misalignment of the cut process itself can be easily detected by visual inspection because the notch and the valley of the V-cut groove are not continuous. However, there was a problem in that the depth and width of the grooves formed by the cut had large errors when visually confirmed, and inspection had to be performed using an instrument.

<Means for Solving the Problems> The present invention solves the above-mentioned conventional problems by etching a symmetrical copper foil pattern with a stepwise change in width on the part to be cut on the insulator. solved.

Function> The copper foil pattern functions so that the formation position and groove width of the cut groove can be visually sensed by the shape remaining after the groove processing.

<Example> Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 1 is a plan view of the main parts of the printed wiring board of the present invention, in which an electrical conductor pattern (not shown) is formed on the surface, and at a predetermined position of an insulator 2 constituting the printed wiring board 1.
Copper foil pattern 3 for V-cut edge inspection, which is the main part of the present invention
is etched together with the electrical conductor pattern described above. The copper foil pattern 3 is provided on the planned line 3° on which the cutting process will be performed, is symmetrical with respect to the planned line 3°, and has a width of, for example, 0.5+n, 097 rings,
It has a shape that has been changed in stages, such as 1.

Further, the peripheral edge of the insulator 2 where the planned line 3° intersects is cut out in the shape of a chevron, forming a notch 5 whose apex coincides with the planned line 3'.

FIG. 2(a) and FIG. 2(b) are a plan view and a side view of a main part of a printed wiring board showing an example in which the cutting process is performed at the correct position along the planned line, respectively; As shown in the figure, copper foil patterns 3.3 remain symmetrically on the left and right sides of the (1) cut groove 4 formed by V-cutting. From this, it can be confirmed that (1) the cut groove 4 passed through the center of the copper foil pattern 3 and was formed accurately on the planned line. Also, by checking how many steps of the stepped copper foil pattern 3 have been cut out, the cut groove 4 formed
The width of the cut groove 4 can be determined almost accurately.
The depth can also be easily estimated.

Figures 3(a) and 3(b) show a case where the position of the V-cut has shifted due to some reason. Since it does not pass above the planned line 3゛, ■Cut by ■Cut processing? The sizes and shapes of the copper foil patterns 3 remaining on the left and right sides of II4 are clearly different, and it is possible to recognize that a positional shift has occurred just by looking at them.

<Effects of the Invention> As described above, in the printed wiring board of the present invention, a copper foil pattern for inspection is formed on an insulator together with an electrical conductor pattern, and by visually observing the remaining shape of the copper foil pattern,
It is possible to easily check the width and positional deviation of cut grooves formed on printed wiring boards without using any measuring instruments, making it easier to detect non-conforming products and improving inspection work efficiency. Moreover, it has an excellent effect of hardly causing an increase in cost.

[Brief explanation of drawings]

1 to 3(a) and 3(b) show embodiments of the present invention, FIG. 1 is a plan view of the main parts of a printed wiring board, and FIG.
) is the same as above, ■ shows the state where the cutting process has been applied, Figure 2 (b) is a side view of Figure 2 (Jl), Figure 3 (a
) is a plan view of the main part of the printed wiring board showing a state in which the cut grooves are misaligned, and FIG.
4(a) and 4(b) show a conventional example, and FIG. 4(a) is a plan view of main parts of a cut printed wiring board; FIG. 4(b) is a side view of FIG. 4(a). l...Printed wiring board, 2...Insulator 3...
Copper foil pattern, 3°...Planned line 4...■Cut groove, 4'...Trough 5...Notch

Claims (1)

[Claims] 1. In a printed wiring board on which V-cut processing is to be performed at a predetermined position, a copper foil pattern is etched on the planned line of the part where the V-cut is to be made, and the width is changed in stages in a symmetrical manner with respect to the planned line. A printed wiring board characterized in that the groove width and positional deviation of a V cut made by the remaining shape of a foil pattern can be confirmed.