JPH0143874Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to cleaning of a back panel in which connection pins are mounted on a printed circuit board.

(2) Background of the technology A connecting pin is press-fitted into a through-hole on a printed circuit board, plugged into a jack on a printed circuit board package, and the connection pin is soldered to the through-hole in the printed circuit board on the back panel to make a circuit connection. To protect the connecting pins that protrude from the printed circuit board when cleaning with an organic solvent such as trichloroethane to remove flux etc. during cleaning, use a protection whose size matches the external shape of the printed circuit board. A frame is used, and the printed circuit board is 500mm x 500mm.
When the size is on the order of mm, the shape and weight of the protective frame become large, and countermeasures are required to prevent problems in storage and operation of the protective frame.

(3) Prior Art and Problems Figure 1 shows cleaning of a back panel, and Figure 2 shows a plan view A and a side view B of a protective frame for cleaning the back panel.

In the figure, 1 is a printed circuit board, 2 is a connection pin,
3 is solder, 4 is flux, 5 is a protective frame, 6 is a net conveyor, 7 is a dip tank, 8 is a shower tank, 9 is a vapor tank, 10 is trichloroethane, and 11 is a presser plate.

As shown in FIG. 1, a conductor pattern is formed on a printed circuit board 1, holes are drilled at desired positions, and connecting pins 2 are press-fitted into the through-holes. To remove flux 4 remaining on the soldered surface of the back panel bonded by solder 3, an organic solvent such as trichloroethane 10 is used to protect the connecting pins 2 protruding from both sides of the printed circuit board 1 to be cleaned. It is attached to the protective frame 5 and placed on the net conveyor 6, and the depth tank 7, shower tank 8, and vapor tank 9 are sequentially transferred and cleaned.

As shown in Figures 2A and 2B, the protective frame 5 is a frame made of stainless steel plate or the like, and has an opening on one side outside the printed circuit board 1 of the back panel to be protected and cleaned, and has a width of about 60 mm. A stainless steel plate is formed in a U-shape to surround the remaining three sides of the printed circuit board 1, and the printed circuit board 1 with the connecting pins 2 mounted thereon can be loaded without any problem at approximately the center of the width of the surrounding stainless steel plate. A frame-shaped flat plate is provided, and a holding plate 11 is provided to prevent the printed circuit board 1 loaded on the flat plate from falling off.

This protective frame 5 accommodates the printed circuit board 1 with an area of about 500 mm x 500 mm, and the weight of the protective frame 5 is approximately 5 kg.The protective frame 5 is placed on the net conveyor 6 and is continuously taken out manually from the net conveyor 6. In addition, the protective frame 5 is fixed in appearance and requires preparation of the protective frame according to the size of the printed circuit board 1, and the protective frame 5 in the assembled state is not sufficient for management. There were problems such as the need for a large amount of space.

(4) Purpose of the invention In view of the above-mentioned drawbacks of the conventional technology, the present invention has been developed by inserting and soldering connecting pins in the through-holes of the printed circuit board.
To provide a protective frame for washing a back panel, which can be easily handled by reducing the weight of the protective frame, and can be easily managed and organized.

(5) Structure of the invention According to the invention, the purpose is to clean the surface of the printed circuit board of the back panel by cleaning the printed circuit board to protect the connecting pins protruding from the printed circuit board mounted on the printed circuit board. A protection plate that is parallel to the longitudinal direction of the flat plate and has a width equal to the opposite outer side of the board and has a holding mechanism that allows the plane of the printed circuit board and the flat plate to be joined at right angles at a position approximately 1/2 the width, It is characterized by being attached to two opposing sides of the printed circuit board to be cleaned. This is achieved by providing a protective frame for cleaning.

(6) Example of implementation of the idea Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 3 is a plan view A and a sectional view B of the protective frame of the present invention.
FIG. 4 is a sectional view showing the usage of the protective frame according to the present invention.

In the figure, 12 indicates a protection plate, and 13 indicates a holding mechanism.

The protective frame 5 of the present invention is as shown in FIGS. 3A and 3B.
It consists of a stainless steel protection plate 12 attached to two opposite sides of the outer periphery of the printed circuit board 1 to be cleaned, and this protection plate 12 has a width of approximately 60 mm and a length approximately equal to the outer length of the printed circuit board 1 to be attached. It is the length.

A holding mechanism 13 is provided parallel to the longitudinal direction of the protection plate 12 and at the center of its width.

This holding mechanism 13 holds the printed circuit board 1 to be cleaned.
The board of the printed circuit board 1 is in contact with the outside where the device is to be installed, and the board of the printed circuit board 1 is formed into a U-shape, and a spring mechanism is provided inside the U-shape to tighten the inserted printed circuit board 1.

When the printed circuit board 1 is fully inserted into the holding mechanism 13, the holding mechanism 13 has such dimensions that it does not come into contact with the connecting pins attached to the printed circuit board 1.

To use the protective frame 5 according to the present invention, as shown in FIG. 4, the outer sides of two opposing sides of the printed circuit board to be cleaned are inserted into the respective holding mechanisms 13.

At this time, the longitudinal center portion of the protection plate 12 and the center portion of the outer side into which the printed circuit board 1 is to be inserted are located at the same position, so that the end surface of the protection plate 12 does not protrude from the end surface of the printed circuit board 1.

A holding mechanism 13 into which opposing outer parts of the printed circuit board 1 are inserted allows the protective plate 12 to hold the printed circuit board 1.
at right angles to and each protective plate 12 is parallel to
The cross section resulting from this connection is approximately H-shaped.

The two left and right protective frames 5 are taken out from the printed circuit board that has been cleaned and returned to the first step of the cleaning work.

(7) Effects of the invention As explained in detail above, the cleaning protective frame of the present invention has a simpler structure than the conventional protective frame.
Compared to a 500mm x 500mm printed circuit board cleaning protection frame, its weight is approximately 1/5 and the volume is approximately 1/10.
The weight when attached to the printed circuit board to be cleaned is lighter, the operability is good, and the space required to store the protective frame alone is smaller.

In addition, to attach the protective frame, it is only necessary to insert it into a holding mechanism with a spring, and the time required for setting is about 1/5 compared to conventional methods, and since there is no directionality for setting, installation is easier. It has the following effects.

[Brief explanation of drawings]

Fig. 1 shows cleaning of the back panel, Fig. 2 shows a plan view A and a side view B showing a protective frame for cleaning the back panel, and Fig. 3 shows a plan view A and a cross section of the protective frame of the present invention. FIG. 4 is a sectional view showing the use of the protective frame according to the present invention. In the figure, 1 is a printed circuit board, 2 is a connection pin,
4 is flux, 5 is protection frame, 11 is press plate, 1
2 represents a protection plate, and 13 represents a holding mechanism.

Claims (1)

[Scope of utility model registration request] A protective frame for cleaning, characterized in that a flat plate having a length greater than the total length of the connecting pins and approximately the same length as the outer side length is attached to both opposing outer sides of a printed circuit board to be cleaned. .