JPH01129498A - Radio-wave shielding structure - Google Patents

Abstract

PURPOSE:To stick both frame ground surfaces fast, and to provide shielding against radio waves by a method wherein the sidewall of a base is bent at an obtuse angle to the outside and the frame ground surface is formed, the opposed sidewall of an upper cover is bent so as to be fast stuck to said frame ground surface and the frame ground surface is arranged, and a panel, in which a trench is shaped, is fitted externally and fixed. CONSTITUTION:When frame ground FG surface 11a acquired by externally bend ing the front sidewall of a base 11 consisting of a metallic sheet at an obtuse angle and an FG surface 12a in an upper cover 12 are abutted and a front panel 13 composed of plastics is pushed against in the direction of the arrow, an upper-cover 12 side FG surface 12a is supported by one sidewall of a trench 13a, and the other nose is pushed against the back intermediate section of the base 11 side FG surface 11a, thus fast sticking the FG surface 11a and the FG surface 12a. When the front sidewall of the base 11 is bent at a right angle, a clearance is easy to be shaped.

Description

[Detailed Description of the Invention] [Summary] Regarding the radio wave shielding structure of small and medium-sized electronic devices, the purpose of this invention is to easily bring the frame grounding surface of the upper cover into close contact with the frame grounding surface of the base to shield radio waves. The base is bent outward at an obtuse angle to provide a frame grounding surface, and the opposing side wall is bent so as to be in close contact with the frame grounding surface to provide a frame grounding surface. The upper cover is fixed to the base by bringing the frame ground surface into contact with the panel, and the panel is fixed by fitting the guide onto the frame ground surface. As a result, the frame ground plane is configured to be in close contact with each other.

[Industrial application field]

The present invention relates to a radio wave shield structure for small and medium-sized electronic devices.

Recently, there has been an increase in the number of offices that are equipped with small and medium-sized computers and many terminals, etc., and the radio waves emitted from other devices such as terminals installed in the office can enter the signal line inside the case. In order to improve the reliability of computers, there is a need for an inexpensive radio wave shield structure that can easily shield radio waves.

[Conventional technology]

A radio wave shield structure that has been widely used in the past includes a base 1, a top cover 2, a back cover 4, and the like, as shown in FIG.
In a device housing consisting of a front panel 3, as shown in FIG. 2, the base l is formed into a box shape from a thin metal plate and has a frame grounding surface 1 whose front side wall is bent outward at right angles.
a (hereinafter abbreviated as FG surface), and the upper cover 2 is made by bending the front surface made of a thin metal plate at right angles to the outside to form FC,
Place surface 2a on top cover 2 on base 10) FG surface Ia.
A front panel 3 made of synthetic resin is attached to the bent portion of the upper cover 2 and the front side wall of the base 1 by contacting and fixing the FG surface a of the upper cover 2 to the front side of the upper cover 2 and the base 1. It is configured so that it can be attached to shield radio waves.

[Problems to be Solved by the Invention] The problem with the conventional radio wave shield structure described above is that the FG surface 1a of the base 1 and the FC surface 2a of the upper cover 2 are bent at right angles to the front wall. Therefore, when the upper cover 2 is fixed to the base 1, if the bent part comes into contact with the FG surface 2a and the FG surface 1a, a gap will be created, and the front panel 3 will be made of synthetic resin. Therefore, the problem arises that radio waves passing through the gap cannot be shielded.

In view of the above problems, the present invention aims to provide an inexpensive radio wave shielding structure in which the FG surface of the upper cover can be easily brought into close contact with the FG surface of the base to shield radio waves.

(Means for Solving the Problems) As shown in FIG. 1, the present invention provides a box-shaped 9, for example, by bending the front side wall outward at an obtuse angle to provide an FC surface 11a. A base 11 made of a thin metal plate, and the F
An upper cover 12 made of a thin metal plate has an FG surface 12a formed by bending the side wall facing the FG surface 11a outward so as to be in close contact with the G surface 11a;
It consists of a panel made of synthetic resin, for example, the front panel 13, which has a groove 13a on its rectangular periphery that can be fitted externally into the C surface 12a.
Contact the G surface 12a and contact the FG surface 11al 123
By fitting the groove 133 outwardly and attaching the panel 13, the FC surface 11a and the FC surface 12a are configured to come into pressure contact with each other.

[For production]

In the present invention, the FC surface 11a is formed by bending the front side wall of the base 11 outward at an obtuse angle, and the FG surface 12a is formed by bending the front side wall of the upper cover 12 outward so as to be in close contact with the FG surface 11a. When the front panel 13 is pressed in the direction of the arrow, one side wall of the groove 13a supports the FC surface 12a on the upper cover 12 side, and the other end supports the FG surface 11 on the base 11 side.
Since the FC surface 11a and the FG surface 12a are pressed against the middle part of the back surface of the cell a, it is possible to shield internally generated radio waves and external radio waves.

〔Example〕

The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 shows a cross-sectional view of the radio wave shielding structure according to this embodiment. In the figure, 11 is a base on which various parts constituting the device are attached, 12 is an upper cover that is attached to the upper part of the base, and 13 is a part of the device. This is a front panel that is attached to the front.

The base 11 has a front side wall formed into a box shape from a thin metal plate 2, such as a rolled steel plate, at an obtuse angle outward.

For example, the FC surface 11a is provided by bending it at an angle of 120 degrees, and galvanizing is applied if necessary.

The upper cover 12 is made by bending the front side wall, which is also formed into a lid shape from a rolled M plate of 2 cranes, into a V shape 1, for example, by 120° outward so as to be in close contact with the FG surface 11a, and forming an F0 surface 12a. It is then galvanized if necessary.

The front panel 13 is a rectangular plate large enough to be attached to the front surface of the base 11 and the upper cover 12.
and the FC surface 11a and the FG surface 12a that the upper cover 12 contacts.
On the back side of the position, make a groove 13 of a certain width, for example, 12mm wide and 16mm deep, into which the abutting FC surfaces 11a and 12a can fit.
This is a panel made of synthetic resin with a.

The radio wave shield structure using the above-mentioned members is such that the FG surface 12a of the cover 12 is brought into contact with the FC surface 11a of the base 11, and the FG surface 12a of the upper cover 12 is fixed to the FG surface 11a of the base 11.
Fit the groove 13a of the panel 13 into contact with the G surface 12a,
By pressing the panel 13 in the direction of the arrow and attaching it, the FC surface 11a and the FG surface 12a are configured to be in close contact with each other.

As a result, one side wall of the groove 13a supports the upper cover 12 side FG surface 12a, and the other end supports the base 11 side FG surface 11.
Since the FC surface 1a and the FC surface 12a are pressed against the middle part of the back surface of the FC surface 1a, the FC surface 1a and the FC surface 12a are in close contact with each other, thereby shielding radio waves generated inside and from the outside.

Although the present invention has been described above based on the illustrated embodiments, the present invention is not limited to the embodiments described above, and, for example, the radio wave shielding structure described above may be provided on all side walls and the ceiling plate of the casing.

〔Effect of the invention〕

As explained above, the present invention has an extremely simple structure, and has the advantage that by attaching the front panel, the FG surface of the base and the FG surface of the cover come into pressure contact to shield radio waves, and are extremely economical. Furthermore, it is possible to provide a radio wave shielding structure that can be expected to have the effect of improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a cutaway perspective view showing a radio wave shield structure according to an embodiment of the present invention, FIG. 2 is a cutaway perspective view showing a conventional radio wave shield structure, and FIG. 3 is a cutaway perspective view showing the structure of a housing. . In the figure, 11 is a base, 11a and 12a are FG surfaces, 12 is an upper cover, 13 is a front panel, and 13a is a groove.

Claims (1)

[Claims] The side wall is bent outward at an obtuse angle to form a frame ground surface (11a
) is brought into contact with the upper cover (12), which has a frame ground surface (12a) by bending the opposing side wall so as to be in close contact with the frame ground surface (11a). It consists of a panel (13) provided with a groove (13a) that fits externally into the frame ground surface (11a, 12a),
The upper cover (12) is fixed to the base (11) by bringing the frame earth surfaces (11a, 12a) into contact with each other, and the groove (13a) is fitted onto the frame earth surfaces (11a, 12a). A radio wave shield structure characterized in that the frame ground planes (11a, 12a) are brought into close contact by attaching the panel (13).