JPS60240179A - Guide mark - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to guide marks for printed wiring boards used in electronic equipment.

Conventional configurations and their problems In recent years, the size and weight of electronic devices and high-density mounting have continued to advance, and printed wiring boards are also becoming more and more capable of high-precision, high-density wiring in order to support automatic mounting of electronic components. Needs are increasing.

In general, printed wiring boards are made of copper-clad laminates, and the copper foil part of the copper-clad laminate is etched away, a predetermined conductive circuit pattern is provided, and if necessary, a land that does not require soldering is added. In addition, a solder resist that does not adhere to solder is usually formed on the silver foil portion and the surface of the laminate by screen printing.

Furthermore, if necessary, a road map or service map, etc., to clearly indicate the insertion or mounting position of electronic components is formed by screen printing, and then through-holes for mounting electronic components are punched using a mold. A printed wiring board was obtained by providing it within the land portion of copper foil.

However, the positions of the conductive circuit pattern of the printed wiring board and the through-holes do not necessarily match, and misalignment of the through-holes may occur. In this case, when creating a through hole by punching, etc., it is necessary to align the guide bin of the mold accurately with the guide hole in the printed wiring board, which serves as a reference. An important factor is whether it is placed in a predetermined position with high precision.

A conventional guide mark will be explained with reference to the drawings.

FIG. 1 is a diagram in which a guide hole 2 is provided in a guide mark 1 having multiple concentric rings and a cross shape made of copper foil, and the guide hole 2 is provided at the center of the guide mark 1. 2
The figure shows a state in which the guide hole 2 is offset from the center of the guide mark 1. Conventionally, in order to create the guide hole 2 in the center of the guide mark 1, drilling was performed using a precision high-speed drilling machine while viewing the guide mark 1 with a magnifying glass, but since it was done by hand, slight deviations occurred. If the pattern is misaligned as shown in FIG. 2, the through holes and the outer shape formed by punching will be misaligned from the position of the silver foil circuit pattern, and if the misalignment is large, it may become defective. For this reason, if the spacing between the copper foil rings of the guide mark 1 in FIG. 1 was set to a predetermined dimension, it was possible to determine how much the guide hole 2 had shifted, and visual selection was possible. However, since the determination is made based on the outline of the guide hole 2, it is difficult to accurately measure where on the outline to read the size of the deviation.

As the precision and high-density wiring of printed wiring boards have recently become more and more demanded, the precision of guide hole processing has become an important factor, and the conventional methods have been changed.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides a guide mark for a printed wiring board that increases processing accuracy of the printed wiring board and facilitates inspection and measurement.

Structure of the Invention In order to achieve this object, the guide mark of the printed wiring board of the present invention is such that the center point of a circuit pattern having a rectangular notch provided on an insulating substrate is located at a point where the center of the rectangular notch is located. Then, provide four notches whose tips are located at a position from the center of the circuit pattern that is larger than the flat diameter of the guide hole by the allowable deviation of the guide hole, and connect the tips of the opposing notches. The two diagonal lines are orthogonal to each other, and the intersection point passes through the center point of the circuit pattern. Therefore, using this rectangular notch as a reference, the vertical and horizontal position dimensions are detected using an optical reader, and the point where the center lines of each half position intersect is the guide mark. This becomes the center point, and a guide hole can be easily created using a precision high-speed drilling machine using this point as a target. Also, even if misalignment occurs due to machine error, as long as the outline of the guide hole does not intersect with the four notches of one circuit pattern, the misalignment of the guide hole will be within the allowable value. Since the tip of each notch can be regarded as a point, it is also possible to read the positional dimension optically, and it is possible to accurately measure the vertical and horizontal deviation. Therefore, based on the above measurement results, the deviation can be easily corrected with high accuracy.

Further, in the present invention, the center point of a circuit pattern having a rectangular notch provided on an insulating substrate is formed so that the center of the rectangle coincides with the center point of the circuit pattern, and the center point of the circuit pattern is Four notches are provided so that the tips are located at a position larger than the flat diameter of the guide hole, and the two diagonal lines connecting the tips of the opposing notches intersect at right angles, and the intersection point is the center point of the circuit pattern. Furthermore, the printed pattern to be printed has four protrusions inward at outer positions corresponding to the four notches of the circuit pattern, and the central point of the circuit pattern is When the centers of the printed patterns match perfectly, the clearance between the tips of the notches of the four circuit patterns and the tips of the protrusions of the four printed patterns is set as the printing misalignment dimension. For example, solder resist, load up.

It is also possible to easily detect the dimensional conformity of service maps or conductive pastes.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows guide marks on a printed wiring board in one embodiment of the present invention. In FIG. 3, 3 is a circuit pattern made of copper foil, 4 is a rectangular notch, and 5 is a notch in the circuit pattern. 6 in FIG. 4 is a printed pattern made of solder resist, and 7 is a protrusion.

The above guide marks are usually created by printing an etching resist on the copper foil surface of a copper-clad laminate that has been cut to an appropriate work size, and then etching away the exposed unnecessary portions of the copper foil. It can be formed by so-called etching removal, in which the copper foil surrounding pattern 3 is formed and then the etching resist is removed.

In this case, since a plurality of printed wiring boards are often included in a laminated board of the work size, at least two or more guide marks are provided at positions corresponding to the individual printed wiring boards of the work size.

Further, the dimensions of the guide mark may be as follows, for example. The dimensions of the rectangular notch 40 are 0.8M each in length and width, and the guide mark circuit pattern 3 has a diameter of 3
．． If the guide hole 8 to be provided has a circular shape of OMφ, the diameter of the guide hole 8 to be provided is 2 mmφ, and the turn 3 may be created in advance when creating a pattern film for screen printing.

Furthermore, a ring-shaped solder resist 6 is formed by screen printing so as to surround the guide mark. In this case, a protrusion 7 is formed inside the ring of the solder resist 6 at a position corresponding to the notch 5 of the circuit pattern 3 of the guide mark.
Set it up. 1 of ring dimensions of solder resist 6
For example, the tips of four protrusions 7 having an inner diameter of 3.6 ymφ may be set inward at 0.3 N each.

At this point, the work-in-progress printed wiring board of the work size obtained as described above can be easily inspected for misalignment between the solder resist and the circuit pattern S. In other words, as long as the tips of the four notches 5 of the circuit pattern 3 and the tips of the protrusions 7 of the solder resist 6 do not intersect, it can be considered as a good product.This can be easily done by visual inspection, and if necessary, an optical If the displacement of the solder resist 6 is large, the screen printing can be finely adjusted by reading the displacement dimension using the pattern recognition device.

Next, in order to separate the work-in-process product having a plurality of printed wiring boards into individual printed wiring boards, guide holes 8 shown in FIG. Provided by

In this case, the position for drilling the guide hole 8 is determined by pattern recognition using an optical reading device, and the vertical center line and the horizontal center line of the rectangle are calculated based on the above-mentioned rectangular notch 4. Then, drilling was performed using a drilling machine with the intersection point as the target, but the allowable deviation of the guide hole was 0.
Anything exceeding 2 stations did not occur at all after that, except during initial minor adjustments.

Effects of the Invention As described above, the present invention has a rectangular cutout having a common center of Japan with the circuit pattern, and four cutouts on the outer periphery of the R path pattern whose diagonal lines pass through the center of the circuit pattern.
Since a guide mark is used which has a notch and the distance between the guide hole and the tip of the notch is a deviation tolerance, a printed wiring board with high precision can be easily obtained.

Furthermore, by providing a protrusion of the printed pattern on the outside of the guide mark at a position corresponding to the notch of the circuit pattern, and making the clearance within the permissible deviation of the printed pattern, it is easy to detect printing accuracy or judge whether it is good or bad. It has high industrial utility value because it can be carried out.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a guide mark of a conventional example, a plan view showing guide marks of all embodiments, FIG. 6 is a plan view showing a guide mark of the present invention with a guide hole provided,
The figure is a plan view of the guide mark of the present invention showing a state in which the guide hole and the printed pattern are shifted. 3...Circuit pattern, 4...Square notch, 5...Notch, 6...
Print pattern, 7. Old projection, 8. Guide hole. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 9 Figure 5 @ Figure 2 @ Figure 4 Figure 6

Claims (2)

[Claims] (1) The center point of a circuit pattern with a square notch provided on an insulating substrate is formed so that the center of the square notch coincides with the center point of the circuit pattern, and the distance from the center of the circuit pattern by the allowable deviation of the guide hole is Provide four notches so that the tip is located at a position larger than the radius of the guide hole,
Moreover, there are two diagonal corners connecting the tips of the opposing notches.
A guide mark characterized in that lines are formed so as to be orthogonal to each other and pass through the center point of the circuit pattern. (2) Form the circuit pattern so that the center point of the circuit pattern with a square notch provided on the insulating substrate matches the center of the square notch, and guide from the center of the circuit pattern by the allowable deviation of the guide hole. Four notches are provided so that the tip force i is at a position greater than the radius of the hole, and the two diagonal lines connecting the tips of the opposing notches intersect at right angles, and the point of intersection coincides with the center point of the circuit pattern. Furthermore, the printed pattern to be printed has four protrusions inward at the outer positions corresponding to the four notches and cutouts of the circuit pattern, which are originally the four cutouts of the circuit pattern. 2. The guide mark according to claim 1, wherein the clearance between the tip of the notch and the tip of the protrusion of the four printed patterns is an allowable dimension for printing deviation.