JPH0558277B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a printed circuit board on which electronic components can be mounted without misalignment even when used alone or when two boards are pasted together to form a double-sided printed circuit board. It is.

[Background technology and its problems]

Conventionally, printed circuit boards on which electronic components (e.g., chip-shaped ICs, tantalum capacitors, etc.) are mounted by positioning with a component mounting device are placed on a reference board located at a predetermined distance from the side end surface 2 of the printed circuit board 1, as shown in FIG. First and second reference holes 3 and 4 are provided on the line L. Note that the hole diameter of the first reference hole 3 and the width W of the oval-shaped second reference hole 4 are the same, and the second reference hole 4
are provided at predetermined intervals with the first reference hole 3 as a reference, and with this configuration, the distance between the reference pins of the component mounting device and the distance between the first and second reference holes 3 and 4 completely match. At least, the positioning of the printed circuit board 1 will not be hindered.

Therefore, one side (first side) of this printed circuit board 1
When mounting electronic components onto a wiring pattern (not shown) provided on the surface of the figure, the reference pins of the component mounting device are inserted into the first and second reference holes 3 and 4 for positioning, and then All you have to do is apply cream solder in accordance with the wiring pattern and then mount the electronic components. Then, the electronic components are soldered to the wiring pattern of the printed circuit board 1 by heating.

Furthermore, when mounting electronic components on both sides of the printed circuit board 1, wiring patterns may be formed on both surfaces of the printed circuit board 1, and the process of mounting and soldering the electronic components may be performed twice on the front and back sides.

However, in this second step,
Since the electronic components are mounted first and the soldered surface is placed on the bottom surface and heated to solder the electronic components mounted on the top surface, the solder on the bottom surface where the electronic components have already been mounted will melt again due to the heating. Therefore, it is necessary to use an adhesive to prevent the electronic components from falling.

Therefore, if the two printed circuit boards 1 are pasted with their wiring patterns on the outside to form a double-sided printed circuit board 7 shown in FIGS. Since the heat conduction to the printed circuit board 1 becomes poor, the above-mentioned use of the adhesive can be omitted.
Such a double-sided printed circuit board 7 may be obtained by preparing two printed circuit boards 1 shown in FIG. 1, turning one printed circuit board 1 over in the left-right direction, and pasting it on the other printed circuit board 1 as shown in FIG. , or as shown by the two-dot chain line in FIG.
Prepare two printed circuit boards 1 with reference holes 5 and 6 facing the first and second reference holes 3 and 4 at a predetermined interval, turn one of the printed circuit boards 1 over in the vertical direction, Attach it to the other printed circuit board 1 and attach it to the third
A double-sided printed circuit board 7 may be used as shown in the figure.

However, in the case of Fig. 2, the first and second reference holes 3, 4 of the upper and lower printed circuit boards 1, 1 are inserted, and in the case of Fig. 3, the first and second reference holes of the upper and lower printed circuit boards 1, 1 are Third
reference holes 3 and 5 and second and fourth reference holes 4 and 6
It is difficult to make a double-sided printed circuit board 7 by matching the two sides completely. Therefore, the double-sided printed circuit board 7 cannot be set on the component mounting device, and electronic components cannot be accurately mounted by positioning it using the reference pins of the component mounting device. In addition, in the case of FIG. 3, since the double-sided printed circuit board 7 is transported in the left-right direction, the double-sided printed circuit board 7 is turned over at the electronic component mounting line in a direction perpendicular to the transport direction.
There is a problem in that it makes it difficult to inline the implementation line.

[Purpose of the invention]

This invention was made in view of the above points, and even when used alone or when two sheets are pasted together to form a double-sided printed circuit board, the first and second reference holes are used to position the board with high precision. The present invention provides a printed circuit board on which electronic components can be mounted and which can be easily installed in-line to a mounting line.

[Summary of the invention]

In order to achieve the above object, the present invention provides first and second reference holes arranged at a predetermined interval on a reference line located at a predetermined distance from one side end surface of a printed circuit board, and first and second reference holes arranged at a predetermined interval from a reference line located at a predetermined distance from one side end surface of a printed circuit board. First and second holes larger than the second reference hole are provided, and the first and second reference holes are used for positioning even when used alone or when two sheets are attached and used as a double-sided printed circuit board,
This allows electronic components to be mounted with high precision and allows for easy in-line installation on the mounting line.

〔Example〕

FIG. 4 is a plan view of a printed circuit board showing an embodiment of the present invention, and FIG. 5 is a plan view of a double-sided printed circuit board formed by pasting two printed circuit boards shown in FIG. 4 together.

In these figures, 11 is a printed circuit board with a wiring pattern (not shown) on the surface shown in FIG. 4, and first and second reference holes 13, 14, 1st, 2nd
Holes 15 and 16 are provided at a predetermined distance D from each other. Note that the hole diameter of the first reference hole 13 and the width W of the oval-shaped second reference hole 14 are the same, and the first,
The second holes 15 and 16 are the first and second reference holes 13,
It is formed larger than 14.

Reference numeral 17 denotes a double-sided printed circuit board in which two of the printed circuit boards 11 are attached with their respective wiring patterns facing outside.

As mentioned above, the first and second reference holes 13 and 14
When the printed circuit board 11 of the present invention having the first and second holes 15 and 16 is used alone, the reference pin of the component mounting device is inserted into the first and second reference holes 13 and 16.
14 for positioning and mounting of electronic components with high precision.

In addition, one of the two printed circuit boards 11 shown in FIG. 4 is turned over in the left-right direction, and the other printed circuit board 1
1, the first and second reference holes 13 and 14
and the first and second holes 15 and 16 are at a predetermined interval D, and the first and second holes 15 and 16 are connected to the first and second reference hole 1.
3 and 14, the double-sided printed circuit board 17 shown in FIG. 5 is obtained. Therefore, the upper and lower printed circuit boards 11 and 11 have first and second reference holes 13 and 14 and first and second holes 15 and 1.
There is no need to paste 6 with high accuracy. Moreover, the upper printed circuit board 11 is positioned by inserting the reference pin of the component mounting device through the first and second reference holes 13 and 14, so that electronic components can be mounted with high precision. Then, when the double-sided printed circuit board 17 is turned over in the left-right direction, the lower printed circuit board 11 becomes the upper side, and the reference pins of the component mounting device are inserted into the first and second reference holes 13 and 14 for positioning. Electronic components can be mounted with high precision. Furthermore, the double-sided printed circuit board 17
As shown in FIG. 6, electronic components can be mounted on both sides by flipping it over in the transport direction indicated by the arrow, that is, in the left-right direction in FIG. 5, making it easy to inline the mounting line.

Although the above embodiment has been described with reference to an example in which two printed circuit boards 11 are pasted together, this pasting may also be done by bonding two printed circuit boards 11 with adhesive to form a laminated board. Double-sided printed circuit board 17 by temporarily fixing the opposite end faces with adhesive tape
You can also use it as In the latter case, there is an advantage that the two printed circuit boards 11 can be separated and used later.

〔Effect of the invention〕

As explained above, the printed circuit board of the present invention has the first and second reference holes on the reference line, and the first and second reference holes.
Since the holes are provided at predetermined intervals, electronic components can be mounted with high precision even when used alone or when two sheets are attached to form a double-sided printed circuit board. Furthermore, in the case of a double-sided printed circuit board, electronic components can be mounted on both sides by flipping it over in the transport direction, which has the advantage of facilitating in-line mounting of electronic components.

[Brief explanation of drawings]

Figure 1 is a plan view showing a conventional printed circuit board, Figures 2 and 3 are plan views of a double-sided printed circuit board made by pasting two printed circuit boards shown in Figure 1, and Figure 4 is a plan view showing a conventional printed circuit board.
The figure is a plan view showing an embodiment of the present invention, FIG. 5 is a plan view of a double-sided printed circuit board made by pasting two printed circuit boards shown in FIG. 4, and FIG. It is an explanatory view when inverting. In the figure, 11 is a printed circuit board, 12 is a side end surface, 1
3 is a first reference hole, 14 is a second reference hole, 15 is a first hole, 16 is a second hole, 17 is a double-sided printed circuit board, and L is a reference line.

Claims (1)

[Claims] 1. A first reference hole for positioning on a reference line separated from one side of a printed circuit board by a predetermined distance, and having the same width as the first reference hole in a direction perpendicular to the reference line. a second reference hole extending in the direction of the reference line is provided at a predetermined interval, and further, the printed circuit board is rotated 180 degrees with a rotation axis perpendicular to the reference line and turned over;
When the two printed circuit boards are stacked, the first
and first and second holes having opening areas larger than the opening areas of the first and second reference holes are provided in the printed circuit board at the point where the second reference hole is located. A printed circuit board featuring: