JP2806898B2 - Shield structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shield structure, and more particularly to a shield structure for electromagnetically shielding electronic components mounted on a printed circuit board.

[0002]

2. Description of the Related Art A conventional shield structure of this kind will be described with reference to the drawings.

FIG. 4 is an exploded perspective view showing a first example of a conventional shield structure.

Referring to FIG. 4, this first conventional shield structure shows the contents disclosed in Japanese Utility Model Application Laid-Open No. 64-54396, in which a circuit component 113 for mounting a circuit component 113 for generating electromagnetic waves is mounted on a circuit board 114. An electromagnetic wave shielding structure in which a box-shaped shield cover 115 is attached so as to cover, a box-shaped shield cover portion 118 including a top surface 116 and four side surfaces 117, and four side surfaces 11 of the shield cover portion 118.
A plurality of grounding leads 11 integrally projecting downward from
9, a shield cover 115 having two or more circuit patterns and an outer layer being a grounding layer,
And a circuit board 114 having a plurality of mounting holes 125 corresponding to the grounding leads 119 of the shield cover 115.
The grounding lead 119 is inserted into the mounting hole 125 from the mounting side of the circuit component 113 and the shield cover 11
5, and the grounding lead 119 and the grounding layer are connected by soldering.

FIG. 5 is an enlarged exploded perspective view of a mounting portion showing a second example of the conventional shield structure.

FIG. 5 shows the second prior art shield structure, which is disclosed in Japanese Utility Model Laid-Open Publication No. 58-166092.
11a is provided at a corner, and a tongue contacting the pattern 211a is formed in a corner of the shield cover 212 by bending in a U-shape, and a female screw 2 for fixing the printed wiring board 211 to the tongue is provided.
No. 03 is provided, and the insulating plate 215 inserted into the inner surface of the shield cover is clamped by the tongue.

[0007]

In the case of the first conventional example, this conventional shield structure is such that a ground lead is inserted into a mounting hole from the mounting side of a circuit component, and a shield cover is mounted. Since the grounding lead and the grounding layer are connected by soldering, it is possible to reliably connect to the ground if soldering is performed, but on the other hand, it causes a short circuit in the soldering, In addition, there is a problem that the electronic components may be damaged by heat.

In the case of the second conventional example, there is a problem that tools for screwing and soldering are required for mounting the shield cover, and that the number of mounting steps is large. Further, in the case of the second conventional example, there is a problem that it is necessary to secure a space for soldering and a space for screw holes on the printed circuit board. (Purpose) It is an object of the present invention to provide a shield structure capable of performing sufficient electromagnetic shut-off without considering solderability and screwing, taking into consideration maintainability.

[0009]

According to the shield structure of the present invention, a metal plate having conductivity is processed into a box-shaped structure having one of six surfaces opened, and four of the four side surfaces adjacent to the open surface are formed. A shield cover having projections on at least one side surface or four corners, and the same arrangement position and number of the projections, and when the projections are inserted, they are electrically in surface contact with each other and the exterior is a printed circuit board. Sur in contact with the geological strata
Possess the inserted connection soldering with pinhole-like connector in Horu the connector enclosed within the frame in phantom
A printed circuit board on which electronic components are mounted , wherein the protrusion of the shield cover is inserted into the connector of the printed circuit board, and the protrusion has a semi-cylindrical surface in surface contact with the inside of the connector. It is.

[0010]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 shows a projection of the shield cover in the embodiment, (a) a front view of the projection on the side, and (b) FIG. 3C is a front view of the protrusion at the corner, and FIG.

Referring to FIGS. 1 and 2, the present embodiment
A metal plate having conductivity is processed into a box-shaped structure in which one of six surfaces is opened, and projections 3 are provided on at least one of four sides and four corners adjacent to the opened one surface. A pinhole inserted into a through-hole connected to the ground of the printed board 2 at a position where the shield cover 1 and the printed board 2 on which the electronic components are mounted are in electrical contact with the projections 3. Connector 4.

In FIG. 2, the projection 3 provided on the shield cover 1 is formed into a semi-cylindrical shape by applying pressure from both sides of A and B by processing a part of a side surface and a corner of the shield cover 1 into a convex shape. ing.

Next, a method of connecting the shield cover 1 and the connector 4 in the present embodiment will be described with reference to FIGS.

First, the connector 4 is fixed to the ground pattern 5 by soldering using the ground through hole 6 on the printed circuit board 2 by soldering. Next, the respective projections 3 of the shield cover 1 are press-fitted into the connectors 4 and come into contact with the respective connectors 4. By realizing this structure, an electromagnetic shielding effect can be achieved for a circuit formed on the printed circuit board 2 inside the shield cover 1.

[0016]

As described above, according to the present invention, a metal plate having conductivity is formed into a box-shaped structure having one of six surfaces opened and at least one of four side surfaces adjacent to the opened surface.
A shield cover provided with protrusions on each of the side surfaces and the four corners, and the same arrangement position and number of the protrusions, and when the protrusions are inserted, the surface is electrically in contact with the inside and the outside is the ground layer of the printed circuit board. Is inserted into the through hole
Yes the connected pin halls shaped connector with solder Te and kneading
A printed circuit board on which the electronic components are mounted in a frame surrounding the connector with a virtual line, wherein the protrusion of the shield cover is inserted into the connector of the printed circuit board, and the surface of the protrusion that makes surface contact with the inside of the connector is half. The cylindrical surface has an effect of shielding radio waves radiated from a circuit formed on a printed circuit board or radio waves emitted from the outside. In addition, the shield cover is provided with a projection that can be inserted and fitted into a pinhole-shaped connector, making it easier to disassemble the shield cover and the printed circuit board for maintenance of the circuit inside the shield cover. In addition, there is an effect that the number of maintenance steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIGS. 2A and 2B show a projection of a shield cover in the present embodiment, wherein FIG. 2A is a front view of a projection on a side surface, FIG. 2B is a front view of a projection on a corner, and FIG. It is a bottom view of a projection part.

FIG. 3 is a cross-sectional view illustrating a state in which a protrusion of the shield cover according to the present embodiment is connected to a connector on a printed circuit board.

FIG. 4 is an exploded perspective view showing a first example of a conventional shield structure.

FIG. 5 is an enlarged exploded perspective view of a mounting portion showing a second example of the conventional shield structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield cover 2 Printed circuit board 3 Projection part 4 Connector 5 Pattern wiring 6 Through hole 7 Solder connection part

Claims (2)

(57) [Claims] 1. A metal plate having conductivity is formed into a box-shaped structure having one of six surfaces opened, and protrusions are formed on at least one of four sides or four corners adjacent to the opened surface. The shield cover is provided with the same arrangement position and number of the protrusions, and when the protrusions are inserted, the surface is electrically in contact with the inside and the outside is in the through hole in contact with the ground layer of the printed circuit board. enclosed in phantom the connector possess the inserted connection with solder has been peak <br/> Nhoru shaped connector
And a printed circuit board on which electronic components are mounted in a frame . The shield structure is formed by inserting the projection of the shield cover into the connector of the printed circuit board. 2. The shield structure according to claim 1, wherein a surface of the protrusion that makes surface contact inside the connector is a semi-cylindrical surface.