JPS6141269Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to an improvement in the reinforcing structure of printed circuit boards used in electrical equipment.

(Prior Art) As a reinforcement structure for printed circuit boards used in electrical equipment such as television receivers, a structure using a chassis is conventionally known.

That is, as shown in Figs. 1 and 2, the printed circuit board 1 is partially attached to the chassis 2 and fixed with screws 3, etc., and the chassis 2 has a thick plate bent to prevent deformation. Processed products are used.

However, in order to increase the reinforcing effect with this structure, it is necessary to increase the area of the contact portion 4 between the printed circuit board 1 and the chassis 2, and the printed circuit board 1 has a board area that is even larger than the board area required for electrical performance. is necessary.

In addition, since the printed circuit board 1 and the chassis 2 are fixed only with the screws 3, and the other parts except the screw portions are deformable, there is a drawback that the vicinity of the screw portions is easily damaged by vibration or shock from falling.

In addition, as another structure, as described in Utility Model Application Publication No. 50-20167, a flat plate, L-shaped, or U-shaped reinforcing material is placed around the peripheral edge of the printed circuit board and brought into surface contact with the copper foil part. It is known that a part of the reinforcing material and a copper foil part of the printed circuit board are fixed by soldering.

(Problem to be solved by the invention) However, when using flat reinforcing materials in surface contact like this, strength cannot be obtained unless a thick metal plate is used for strength reasons. As a result, in order for the reinforcing material to be soldered to the printed circuit board, the reinforcing material must be sufficiently heated, which takes a long time, and the heat can discolor and deteriorate the insulating material of the printed board, which is a serious problem. There was a drawback.

In addition, if a flat plate or L-shaped reinforcement material is expropriated,
In order to attach and solder the reinforcing material to the printed circuit board, there was a drawback that the reinforcing material and the printed circuit board had to be temporarily attached by some method before soldering. Furthermore, in order to eliminate the need for temporary fixing, the reinforcing material must be placed on the printed circuit board with the copper foil side facing up, and then soldered using a soldering iron. It was impossible to put the printed circuit board into a solder bath and solder it.

As a countermeasure to this problem, it is possible to temporarily fix the reinforcing material by bending it into a U-shape and inserting it into the edges around the printed circuit board, but generally, since printed circuit boards with a thickness of about 1.0 mm to 1.6 mm are used, the spacing is limited. Pressing the narrow U-shaped reinforcing material made the mold weak, making it difficult to mass-produce. Furthermore, depending on the tolerance of the spacing between the U-shaped parts of the product, when the reinforcing material is attached to the printed circuit board, accidents may occur such as the reinforcing material becoming loose or not being able to be attached, resulting in poor installation workability. .

In addition, since the printed circuit board and the reinforcing material are attached in surface contact in any shape, the width of the pattern to which the reinforcing material is attached must be widened, and it is impossible to place electrical components on this pattern surface. Therefore, there was a reinforcement structure for the printed circuit board that was inappropriate for effectively utilizing the area of the expensive printed circuit board.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and aims to provide a reinforcing structure for a printed circuit board that does not require a chassis and can obtain a high reinforcing effect with a simple operation.

[Structure of the idea]

(Means for solving the problem) In order to achieve this purpose, this invention has the following structure. A metal piece is placed approximately perpendicular to the ground pattern of the printed circuit board and soldered.

(Function) By arranging the metal piece at right angles to the ground pattern, the entire metal piece is soldered from both sides and becomes a thick plate, so a thin metal piece can be used. Since the metal pieces are arranged in the thickness direction of the printed circuit board and are fixed together with solder so that they have a T-shaped cross section, the same effect is obtained as if the thickness of the printed circuit board were extremely increased.

(Example) An example of this invention will be described with reference to the drawings. FIG. 3 is a side view of a printed circuit board illustrating the present invention, and FIG. 4 is an exploded perspective view of the printed circuit board viewed from the copper foil side.

An earth pattern 3 is provided on the outer periphery of the copper foil side of the printed circuit board 1, and through holes 9, 9 ... are provided in the earth pattern 3 as required. A solderable thin metal piece 6 has projections 61,
The projection 61 is bent so as to project toward the component mounting side 14 of the printed circuit board 1, or cutouts 62, 62 of a size substantially equal to the thickness of the printed circuit board are provided at the position of the projection 61 in contact with the earth pattern 3, so that the projection 61 projects toward the component mounting side 14 of the printed circuit board 1 and is prevented from twisting, and the printed circuit board 1 and the metal piece 6
Temporary installation is possible.

This metal piece 6 is attached to the copper foil side of the printed circuit board 1 at a substantially right angle to the ground pattern, and the protrusion 6 is attached as described above.
1 is inserted into the through hole 9 and is attached by bending or twisting. and other electrical parts 10,1
Similar to soldering for zero fixation, the copper foil of the printed circuit board 1 and the metal piece 6 are put into a solder bath and are integrated with the solder 11 and firmly fixed.

In the printed circuit board reinforcement structure configured as described above, the metal piece 6 is attached approximately at right angles to the copper foil, so that
The area covered by the metal piece 6 with respect to the printed circuit board 1 is reduced, and the area of the printed circuit board can be utilized effectively. In other words, the metal piece can be attached using a narrow ground pattern.

Furthermore, since the metal piece 6 is attached to the lower side of the copper foil surface at right angles to the ground pattern made of copper foil, the entire metal piece is soldered and further reinforced, and at the same time, both sides of the metal piece in the thickness direction It is soldered to copper foil, and unlike the conventional soldering of a part of a metal piece, stable soldering is possible.

Considering all of the above, by arranging the metal pieces perpendicular to the ground pattern, it is possible to reduce the plate thickness by half or less compared to the conventional reinforcement in which a flat plate is attached in surface contact with the copper foil part. be. Furthermore, since this metal piece is soldered on both sides in the plate thickness direction, the same effect as if the plate thickness were increased occurs, and the metal piece is reinforced, making it possible to further reduce the plate thickness.
As a result, the metal piece is instantly heated and soldered to the copper foil in a short time, making it highly effective against heat-induced discoloration and deterioration of insulating materials used in printed circuit boards.

In addition, since the metal piece is provided with a protrusion 61, it can be inserted into the through hole 9 of the printed circuit board 1, and the metal piece can be easily temporarily fixed by bending or twisting, which prevents the metal piece from rattling or being impossible to mount as in the past. No accidents will occur.
In addition, when the printed circuit board 1 and the electrical component 10 are soldered in the solder bath, the metal piece 6 is temporarily attached to relatively firmly reinforce the printed circuit board, so that printing due to heat in the solder bath is more effective than in the past. The amount of deformation of the board has been reduced.

The fact that the amount of deformation of the substrate due to heat is small means that the amount by which the deformation is restored after the heat cools down is also reduced.
Therefore, defects in soldering reliability that occur during restoration are reduced, and soldering reliability on the entire printed circuit board is improved.

Furthermore, since the amount of deformation of the printed circuit board due to heat was reduced, there was also the effect that lifting caused by attachment of the electrical component 10 and the printed circuit board was reduced.

A modification of the present invention will be described with reference to FIGS. 5 and 6.

What is shown in Fig. 5 shows how the printed circuit board and the metal piece are attached by soldering, and the metal piece is fixed with solder 11 along the entire circumference of the outer peripheral edge of the printed board. For example, soldering may be removed from a portion of the circumference rather than the entire circumference, and soldered portions may be provided here and there for fixation. Even if a portion of the solder is removed, the strength of the printed circuit board will not be reduced that much because the metal pieces continue to exist.

It is also possible to cut out a part of the metal piece that contacts the copper foil at the position where this soldering is partially removed, and create a gap between the printed circuit board and the metal piece so that another circuit pattern can be provided in between. .

However, in this case, the strength of the printed circuit board will be reduced to some extent, so it is desirable that no heavy electrical components be present near this notch.

[Effect of idea]

As explained above, according to the present invention, the printed circuit board is reinforced with metal members and solder, so unlike the conventional method that uses a chassis, it is not necessary to process thick plates or increase the area of the printed circuit board. In addition to eliminating the need for additional steps, it also reduces the number of screws and eliminates the shock noise that occurs between the board and chassis.

In addition, the metal components can be simple and easily available, and the soldering process is simple and has excellent workability.

Therefore, this invention was able to provide a practically excellent reinforcing structure for printed circuit boards not only for television receivers but also for electrical equipment in general.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional reinforcement structure for a printed circuit board, FIG. 2 is a sectional view taken along the line A-A in FIG.
The same figure is an exploded perspective view of the printed circuit board seen from the copper foil side, and FIGS. 5 and 6 are explanatory diagrams showing the state in which the printed circuit board and the metal piece are attached. 1...Printed circuit board, 3...Earth pattern, 6...
...Metal piece, 9...Through hole, 10...Electrical component, 11
……solder.

Claims (1)

[Claims for Utility Model Registration] A grounding pattern made of copper foil along the outer periphery of a printed circuit board, a solderable metal piece disposed approximately at right angles to the grounding pattern, and this metal piece and the grounding pattern. A reinforcing structure for printed circuit boards, characterized by comprising solder for fixing.