JPH0266992A - Printed wiring board - Google Patents

Abstract

PURPOSE:To judge the deviation of a pattern accurately by printing a deviation detecting pattern for judging suitability of the allowance range of the printing pattern deviation in the vicinity of the cutting position of a board in each product region of each wiring pattern when screen printing of a wiring circuit pattern is performed. CONSTITUTION:A wiring pattern 2, a reference pattern 4 and deviation detecting patterns 5 and 5A are printed on the surface of a board 1 at the same time. A wiring pattern 2A is printed on the rear surface of the board 1. The wiring patterns 2 and 2A and the deviation detecting patterns 5 and 5A are covered with a mask pattern. A hole is provided at a part of the reference pattern, and reference hole 4A for pressing is formed. With the reference hole 4A as a reference, pressing is performed along cutting lines 3 and 3A for product regions at the same time. Thereafter, the sizes between the position of a cutting surface 7 of each printed wiring board 1A and the deviation detecting patterns 5 and 5A are confirmed, and the pass of fail of the printed wiring board 1 is judged. In this way, whether the deviated state of the pattern is within the specified value or not can be judged accurately and readily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printed wiring board having a plurality of rows of wiring patterns formed by screen printing, and particularly to a printed wiring board that is effective in detecting pattern displacement.

[Prior Art] Generally, in order to manufacture a printed wiring board by screen printing, for example, holes for through-hole connections are formed, copper plating is applied to the hole surfaces, and multiple rows of resist circuit patterns are printed on the front and back surfaces. Copper in unnecessary areas other than the circuit pattern is removed by etching, then a mask pattern is printed, reference holes for press punching are formed, and press punching is performed to obtain a plurality of printed wiring boards.

When manufacturing printed wiring boards using this type of screen printing method, the expansion and contraction of the screen is the size of the wiring pattern.
There is a problem in that it affects accuracy.

[Problems to be Solved by the Invention] When using the screen printing method as described above, the screen tends to expand and contract due to temperature and humidity, and if one screen is used many times, the screen will expand. In particular, when one screen has multiple rows of wiring patterns, pattern displacement is likely to occur.

Conventionally, a worker visually inspects the pattern for deviation due to screen elongation, and if the pattern deviation is large, the screen is replaced with a new one. However, because there is no way to accurately visually determine the pattern deviation, the timing for screen replacement is often missed, and the stretched screen is often continued to be used even if the pattern deviation exceeds the allowable range, resulting in a large number of defective products. There was a problem.

Therefore, an object of the present invention is to provide a stable printed wiring board in which pattern deviation can be easily determined.

[Means for Solving the Problems] The present invention provides a printed wiring board in which a plurality of wiring circuit patterns are arranged on the printed wiring board by screen printing, and the periphery of the product area corresponding to each wiring circuit pattern is cut by press punching. , a reference pattern is provided on the printed wiring board to determine a reference position for press punching when screen printing the wiring circuit pattern, and a printing pattern deviation is allowed in the vicinity of the board cutting surface position of each product area in each wiring pattern. It is constructed by printing a deviation detection pattern that determines whether the range is good or bad.

[Operation] With the above configuration, it is determined whether or not the reference dimension between the position of the cut surface of the substrate after press punching and the position of the detection pattern is within the allowable range, and this is used as a criterion for replacing the screen.

[Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 5 show a printed wiring board for a motor control circuit, l is a printed wiring board, and the surface of this board 1 has the lines shown in FIG. 1 as shown in FIG. A plurality of wiring patterns 2 are printed, and a plurality of rows of wiring patterns 2A shown in FIG. 2 are printed on the back surface corresponding to the wiring patterns 2. 3.3A is a cutting line indicated by a dashed line, and the area within this cutting line 3.3A is the product area. 4 is a reference pattern of reference holes for press punching printed on the center of the circle and on three sides of the wiring pattern 2, and the reference hole 4A is formed by drilling the reference pattern mark 4 portion. 5
5A is a plurality of displacement detection patterns printed on the outside of the periphery outside the product area on the surface of the substrate 1, and 5A is a plurality of displacement detection patterns printed on the inside of the periphery of the product area. In this embodiment, each of the displacement detection patterns 5, 5A are formed at intervals corresponding to the allowable range of pattern deviation from the center of the product area. Reference numeral 6 indicates the outer circumferential line of the mask pattern, and 6A indicates the inner circumferential line thereof. The wiring patterns 2, 2A and the detection pattern 5.5A are covered by the mask pattern printed within the outer circumferential line 6 and the inner circumferential line 6A.

Then, by a well-known screen printing method, the wiring pattern 2, the reference pattern 4, and the deviation detection patterns 5, 5A are simultaneously printed on the front surface of the board 1, and the wiring pattern 2A is printed on the back surface of the board 1, and each wiring pattern 2 .2
A and the deviation detection patterns 5, 5A are covered with a mask pattern, the reference pattern 4 portion is punched to form a reference hole 4A for press punching, and each product area is simultaneously cut along the cutting line 3 using this reference hole 4A as a reference. .Press out from 3A. Thereafter, the dimensions between the cut surface 7 position of each printed wiring board IA pressed out and the deviation detection patterns 5, 5A are checked to determine whether the printed wiring board IA to be a product is good or bad. Then, the cut surface 7 and the detection pattern 5.5A
The screen is replaced with a new one because the gap between the screen and the screen, that is, the pattern deviation, is larger than the allowable range.

In this way, in the above embodiment, since the printed wiring board 1 is constructed by providing the detection pattern 5.5A around the plurality of rows of wiring patterns 2 in accordance with the allowable range of pattern deviation, Just by checking the distance between the cut surface 7 position of each printed wiring board IA and the detection pattern 5.5A, it is possible to accurately and easily judge whether the pattern misalignment is within the standard, and this allows the screen to be replaced. Never miss a time.

Note that the present invention is not limited to the above embodiments,
Various modifications are possible within the scope of the gist of the present invention. For example, the detection pattern may be provided on either the outer periphery or the inner periphery of the product area, or the detection pattern may be provided on the entire periphery of the product area. Alternatively, a plurality of them may be provided around the area.

[Effects of the Invention] The present invention provides a printed wiring board in which a plurality of wiring circuit patterns are arranged on the printed wiring board by screen printing, and the periphery of a product area corresponding to each wiring circuit pattern is cut by press punching. A reference pattern is provided on the printed wiring board to determine the reference position of the press punching position during screen printing of the pattern, and the acceptability of the printed pattern deviation in the vicinity of the board cutting surface position of each product area in each wiring pattern is determined. By printing a misalignment detection pattern, it is possible to provide a printed wiring board that can accurately determine pattern misalignment.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention, FIG. 1 is a front view showing a pattern printed on the front surface of a substrate, FIG. 2 is a front view showing a pattern printed on the back surface of a substrate, FIG. 3 is a front view showing patterns printed in a plurality of rows, FIG. 4 is a front view of a printed wiring board that has been press-cut, and FIG. 5 is a front view of the blank after press-cut. 2. 4.5.・Printed wiring board 2A-・Wiring pattern・Reference pattern 5A・・Detection pattern・Cut surface Patent applicant Nippon Seiki stock procedure correction band (voluntary) August 17, 1999■, Name of case 1986 Patent Application No. No. 218123 2, Name of the invention Printed wiring board 3, Person making the amendment

Claims (1)

[Claims] (1) In a printed wiring board in which a plurality of wiring circuit patterns are arranged on a printed wiring board by screen printing, and the periphery of a product area corresponding to each wiring circuit pattern is cut by press punching, when the wiring circuit pattern is screen printed, A reference pattern is provided on the printed wiring board for determining the reference position of the press punching position, and a deviation detection pattern is provided in the vicinity of the board cutting surface position of each product area in each wiring pattern to determine whether or not the allowable range of printing pattern deviation is acceptable. A printed wiring board characterized by printing.