JPH06260729A - Printed board - Google Patents

Abstract

PURPOSE:To provide a printed board wherein perforations provided for it so as to divide it by bending are protected against unexpected cracks. CONSTITUTION:In a printed board 10 where perforations 16 are provided, a reinforcing copper foil 14b is attached around the perforations 16 composed of round holes 16a and slots 16b provided to a rear side 22 of the board 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board in which a large number of printed circuit boards are connected to one printed circuit board by perforations and the printed circuit boards are separated from the perforated lines to obtain a large number of printed circuit boards.

[0002]

2. Description of the Related Art Conventionally, in the case of obtaining a large number of printed circuit boards from a single printed circuit board, as shown in FIG. 1, a large number of copper foils 14a for pattern wiring are formed on a surface 12 of the printed circuit board 10, Boards with different purposes are divided into round holes 16a and long holes 16b (hereinafter, round holes 16a and long holes 16b are collectively referred to as perforations 16), and electronic components 20 are mounted in the component mounting holes 18 of the printed circuit board 10. After that, there is one that obtains a large number of boards 10a and 10b from one printed board 10 by breaking the perforations.

[0003]

However, conventionally, when the electronic component 20 is mounted, the pressure for mounting is applied to the surface 12 of the printed circuit board 10 and the printed circuit board 10 warps and breaks from the perforations 16. There was something that happened.

The present invention has been made to solve the above-mentioned problems, and provides a printed circuit board capable of preventing inadvertent cracking by covering a metal foil around the perforations on the back surface of the printed circuit board. The purpose is to do.

[0005]

In order to achieve this object, a printed circuit board of the present invention has perforations for folding and separating, and a surface for mounting electronic parts,
The perimeter of the perforations on the back surface of the printed circuit board is covered with a metal foil.

[0006]

The printed circuit board of the present invention having the above structure is
The metal foil is attached around the perforations on the back surface of the printed circuit board.

[0007]

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

FIG. 1 is a perspective view showing the surface of the printed circuit board of the present embodiment. The structure on the surface 12 of the printed circuit board 10 is the printed circuit board 10 described in the prior art.
Since it is the same as, the description thereof will be omitted.

FIG. 2 is a perspective view showing the back surface of the printed circuit board of this embodiment.
The copper foil 14a is attached in the same manner as the surface 12, and the electronic component 2
A pattern for electrically connecting 0 and the electronic component 20 is formed. In addition, the printed circuit board 10 has a round hole 1 in order to obtain a large number of boards 10a and 10b from one board 10.
A perforation 16 composed of 6a and an elongated hole 16b is provided. Further, the printed circuit board 10 has a component mounting hole 18 for mounting the electronic component 20.

On the back surface 22 of the printed circuit board 10, a round hole 1
A copper foil 14b for reinforcement is solidly attached around 6a and the elongated hole 16b.

Why is the copper foil 14b on the back surface of the printed circuit board 10?
Whether to attach will be described with reference to FIG. Electronic component 20
At the time of mounting, both ends of the printed circuit board 10 are fixed, and components are mounted from above the surface 12. At that time, a force 23 is applied to the printed circuit board 10 from above. At that time, the copper foil 14 on the surface 12 of the printed circuit board 10 shrinks. That is, the compression force 24 works. Next, on the back surface 22, the copper foil 14 is stretched. That is, the tensile force 26 works. In general, metals are strong against the tensile force 26, so that the copper foil 1 is formed on the back surface 22 of the printed circuit board 10.
It was decided to attach 4b.

Therefore, it is possible to prevent unexpected breakage of the perforations 16. Moreover, the copper foil 14a that electrically connects the electronic components 20 to each other when forming the pattern
Since the reinforcing conductive foil 14b and the reinforcing conductive foil 14b can be attached at the same time, the number of steps is not increased.

In this embodiment, the reinforcing copper foil 1 is used.
4b was attached only to the back surface 22 of the printed circuit board 10,
It may be attached to both the front surface 12 and the back surface 22 of the printed circuit board 10.

Further, the place where the reinforcing copper foil 14b is attached is the side surface 2 between the round hole 16a and the long hole 16b of the perforation 16.
8 (indicated by a mesh line in FIG. 2) may be sufficient.

Further, as shown in FIG. 4, a copper foil 14 for reinforcement is used.
In b, a portion 30 where the copper foil 14b is not attached may be formed on the parallel line between the round hole 16a of the perforation 16 and the elongated hole 16b. As a result, in addition to strengthening the perforations 16, it is possible to prevent irregular cracks in the perforations 16 when bending and separating.

In this embodiment, the copper foil 14 is used as the metal foil.
However, other metal foil such as silver foil may be used.

[0017]

As is apparent from the above description, the printed circuit board of the present invention can prevent unexpected cracks from perforations by attaching the metal foil around the perforations. Therefore, the practical effect is extremely large.

[Brief description of drawings]

FIG. 1 is a perspective view showing a surface of a printed circuit board according to an embodiment of the present invention and a conventional example.

FIG. 2 is a perspective view showing a back surface of a printed circuit board according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a force applied to a metal foil when a printed circuit board is warped.

FIG. 4 is a perspective view showing a back surface of a printed circuit board according to a modified example of the present invention.

[Explanation of reference symbols] 12 front surface 14b copper foil for reinforcement 16 perforations 16a round hole 16b long hole 20 electronic component 22 back surface

Claims (1)

[Claims] 1. A perforation for folding and separating,
A printed circuit board having a front surface for mounting electronic components, wherein the perimeter of the perforations on the back surface of the printed circuit board is covered with a metal foil.