JPS6240458Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a printed board, and in particular, proposes a printed board in which the etched state of a conductive pattern can be easily checked.

Generally, when configuring a circuit using a printed board, for example, the conductor patterns configuring the power supply of a printed coil of a high frequency circuit or a high voltage circuit require sufficient precision in pattern width and pattern spacing.
It is necessary to check whether the conductor pattern is etched accurately. In particular, as a large number of circuits are formed on small substrates due to the miniaturization and integration of equipment, it is necessary to carefully check the finished state of etching using jigs, etc. The work was extremely inefficient.

Therefore, the present invention has been devised to improve these points, and the details thereof will be explained below with reference to the drawings.

FIG. 1 shows an embodiment of a printed board according to the present invention, where 1 is a substrate, 2 is a conductor pattern formed on the substrate, and 3 is a checker provided to check the etching condition of this pattern. It's a mark.

The check mark 3 is provided at an appropriate location of the pattern whose etching condition is to be checked at the same time as the pattern is formed, as shown in FIG. 2a.
It is formed of the same conductive material on the outside of pattern 2, as shown in FIG.
Formed as an internal conductor cutout. That is, shapes corresponding to the conductor patterns 2 and check marks 3 are formed by printing an epoxy acrylate-based etching resist on a copper-clad laminate, which is the base material of the printed board, and after curing the resist with ultraviolet rays. Etching and removing the copper in the areas where the resist is not applied by immersing it in a solution such as ammonium sulfate, and then removing the etching resist on the pattern 2, etc. by immersing it in an alkaline solution. It is formed by At this time, the pattern and check mark are printed accurately using the etching resist so that the tip of the triangular mark comes into contact with the edge of the conductor pattern 2 when etching is performed accurately.

Therefore, in the etching process for removing conductor parts other than the pattern when forming the conductor pattern 2 on the substrate 1 shown in FIG. 1, if etching is not performed sufficiently due to insufficient etching time, etc. , the shape of the check mark 3 becomes larger and the connecting part to the conductor pattern 2 increases (Fig. 3a).
(in the case of FIG. 3b), or the shape of the check mark 3 becomes smaller and moves away from the edge of the conductor pattern 2 (in the case of FIG. 3b). Furthermore, in the case of excessive etching, the situation is completely opposite to that described above, as shown in FIGS. 4a and 4b. Therefore, by checking the check mark 3 after etching or when the printed board is completed, it is possible to easily check the finished state of the etching, that is, whether the conductor pattern 2 has been etched to a predetermined width. .

The above check marks 3 may be provided at locations where the width or spacing of the conductor patterns 2 should be checked, but since the progress of etching differs depending on the direction, it is sufficient to provide check marks in two directions, vertical and horizontal, at one location, as shown in Figures 5a and 5b. Also, when it is necessary to check the entire conductor patterns on the printed board, it is sufficient to provide multiple sets of check marks in the two directions.

Since the printed board of the present invention is constructed as described above, it is possible to check whether the conductor patterns have a predetermined width or spacing after the etching process during printed board manufacturing or after the printed board is completed. Since the marks can be checked very easily by visual inspection, inspection efficiency is greatly improved. Furthermore, since the check mark is formed simultaneously with the conductor pattern, no separate process is required to form the check mark, and therefore, manufacturing costs do not increase. Moreover,
Since the check mark is used to inspect the etching state by checking the contact and separation between the tip and the edge of the conductor pattern, it does not require a large space to provide the check mark, and therefore the etching state can be strictly controlled. It can also be provided in areas where the pattern width or pattern spacing is narrow.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted plan view of a printed board embodying the present invention, FIGS. 2 a and b show the printed board in a normal etched state, and FIGS.
b is a partial enlarged view showing the case of insufficient etching, and FIGS. 4a and b are partially enlarged views showing the case of excessive etching,
FIGS. 5a and 5b are partially enlarged views showing a specific embodiment of the check mark. 2...Conductor pattern, 3...Check mark.

Claims (1)

[Scope of utility model registration request] The check mark is made of the same material as the conductor pattern, such that the tip of the check mark having an acute tip indicating the etching condition of the conductor pattern is in substantial point contact with the edge of the pattern in the normal etching condition. A printed board in which the etching condition is formed on the outside of the pattern or as a conductor cutout inside the conductor pattern, and the etching condition can be checked by the degree of contact and separation between the check mark and the pattern.