JPH0143916Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a printed circuit board structure with a shield plate used in high frequency equipment such as a television tuner.

[Background of the idea]

1 to 5 show the mounting structure of a conventional printed circuit board structure with a shield plate, and FIG. 1 is a perspective view when the printed circuit board 2 with the shield plate 1 attached is housed in the casing 3. be. In FIG. 1, a convex portion 4 is formed at the lower tip of a shield plate 1, and an electronic component 6 such as a capacitor or a coil is mounted on a component mounting surface 5 on the upper surface of a printed circuit board 2. The lower surface of the printed circuit board 2 is the soldering surface 7
When the shield plate 1 is attached to the printed circuit board 2, the electronic components 6 are arranged and inserted on the component mounting surface 5, and the shield plate 1 is attached with the convex portion 4 projecting downward from the printed circuit board 2. The electronic component 6 and the shield plate 1 are simultaneously soldered on the soldering surface 7. A through hole 8 having a diameter slightly wider than the convex part 4 of the shield plate 1 is provided on the bottom surface of the casing 3. The convex part 4 is inserted into the through hole 8 from the direction of arrow A in the figure, and the casing is The printed circuit board 2 is housed in the inside.

However, in the conventional example, since the tip of the convex part 4 is a flat surface, as shown in the front view of the main part in FIG. 2 and the side view of the main part in FIG. Solder 9 tends to accumulate in the parts, which makes it difficult to insert into the through hole 8, and in some cases, the solder has to be removed.

Further, the convex portion 4 inserted into the through hole 8 is as shown in the front view of the main part in FIG. 4 and the side view of the main part in FIG.
It is fixed to the casing 3 by dip soldering or manual soldering from below, but as mentioned above, there is a clearance between the protrusion 4 and the through hole 8, so it is necessary to prevent the dip from floating or to prevent it from floating when soldering the dip. In order to prevent it from falling off during manual soldering, it was necessary to bend and temporarily fix the part of the convex part 4 that protruded from the housing 3.
Furthermore, as shown in FIGS. 4 and 5, due to the above-mentioned clearance, the amount of solder 9 adhering to the convex portion 4 was insufficient, and in some cases, corrective soldering was required in a subsequent process. .

[Purpose of invention]

The present invention attempts to eliminate such conventional drawbacks, and its purpose is to provide a printed circuit board structure with a shield plate in which the shield plate soldered to the printed circuit board can be easily and securely attached to the housing. There is something to do.

[Summary of the idea]

In order to achieve this objective, the present invention forms the convex part of the shield plate into a tapered shape that is slightly wider at the upper part (base) than the through hole of the housing and gradually becomes narrower towards the lower part (tip). The present invention is also characterized in that the convex portion is provided with a notch that faces downward.

[Example of idea]

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figures 6 to 10 show an embodiment of the printed circuit board structure with a shield plate of the present invention, and parts corresponding to those in Figures 1 to 5 describing the conventional example are given the same reference numerals. There is.

FIG. 6 is a perspective view of the printed circuit board 2 to which the shield plate 1 is attached when it is housed in the housing 3.
It is characterized by its shape. That is, the convex portion 4 is tapered and has an acute triangular notch 4a facing downward, and the convex portion 4 sandwiching the notch 4a
The two tips 4b of are sharply pointed. The width of the convex portion 4 is wider than the width of the through hole 8 of the housing 3 at the upper part, but it becomes narrower than the width of the through hole 8 at the lower part because it tapers as it approaches the tip 4b. ing. The convex portion 4 is connected to the printed circuit board 2.
After making the shield plate 1 protrude from the lower soldering surface 7, the shield plate 1 is dipped together with the electronic component 6 placed and inserted on the component mounting surface 5, and the shield plate 1 and the electronic component are placed on the soldering surface 7. Solder component 6. Then, the convex portion 4 of the shield plate 1 is
Insert into the through hole 8 of the housing 3 from the direction of arrow A in the figure.

At this time, since the protrusion 4 is provided with a notch 4a and the tip 4b is sharp, as shown in the front view of the main part in FIG. 7 and the side view of the main part in FIG.
The amount of solder 9 that adheres to the tip of the convex portion 4 during the dip soldering described above is very small. Therefore,
The protrusion 4 can be easily inserted into the through hole 8.

Further, the convex portion 4 is tapered, and some elastic force is generated in the portions of the convex portion 4 facing each other across the notch 4a, so that the convex portion 4 inserted into the through hole 8 is This results in a strong fit with the hole 8, and temporary fixation is automatically performed. Therefore, when soldering the convex portion 4 inserted into the through hole 8 to the housing 3 from below, there is no need for special temporary fixing. Furthermore, at this time, the solder 9 is applied to the notch 4 of the convex portion 4, as shown in the schematic view of the main part in FIG. 9 and the side view of the main part in FIG.
Since the solder also flows into and adheres to a, the amount of solder is sufficient and a stable holding force can be obtained.

[Effect of idea]

As explained above, according to the present invention, the protrusion of the shield plate soldered to the printed circuit board can be easily inserted into the through hole of the casing, and the protrusion is soldered to the casing. At the same time, special temporary fixing is not required, and the amount of solder adhesion increases, resulting in improved holding power.

[Brief explanation of the drawing]

Figures 1 to 5 show conventional examples.
The figure is a perspective view of the printed circuit board with the shield plate attached when it is stored in the housing, Figure 2 is a front view of the convex part of the shield plate inserted into the through hole of the housing, and Figure 3 is the second
4 is a front view of the convex portion of the shield plate soldered to the housing, FIG. 5 is a side view of FIG. 4, and FIGS. 6 to 10 are one embodiment of the present invention. Figure 6 is a perspective view of the printed circuit board with the shield plate attached when it is stored in the housing, Figure 7 is a front view of the protrusion of the shield plate inserted into the through hole of the housing, and Figure 8 is a perspective view of the printed circuit board with the shield plate attached. The figure is a side view of Figure 7, Figure 9 is a front view of the convex part of the shield plate soldered to the housing, and Figure 10 is a side view of Figure 7.
The figure is a side view of FIG. 9. 1... Shield plate, 2... Printed circuit board, 3...
...Housing, 4...Protrusion, 4a...Notch, 4b...
Convex tip, 7...Soldering surface, 8...Through hole, 9...
solder.

Claims (1)

[Scope of utility model registration request] A shield plate having a convex portion at its lower tip, a printed circuit board with the convex portion protruding from a soldering surface on the lower surface and the shield plate being soldered on the soldering surface, and the convex portion being inserted through the bottom surface. and a casing for housing the printed circuit board, the protrusion being soldered from below, and the protruding base of the protrusion being somewhat wider than the through-hole and directed toward the tip. 1. A printed circuit board structure with a shield plate, characterized in that the shield plate is formed into a tapered shape that gradually becomes narrower, and the convex portion is provided with a notch facing downward.