JPH0142393Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a housing for housing a transmitting/receiving module circuit forming an assembly unit of a configuration such as a multiplex radio device.

(b) Technical background Regarding the transmitting (receiving) RF system circuit or IF system circuit, etc., which are the constituent units of the radio equipment, it is important to simplify the assembly and to facilitate post-assembly adjustment and testing. It is common practice to use a modular structure for efficient operation.

In this case, it is important that each functional circuit module has good heat dissipation properties, and that each module has a housing (case) shielding structure that prevents any electromagnetic interference with other modules. The present invention is directed to a means for constructing a housing shield for a modular unit that is easy to test, adjust, or inspect during panel assembly or maintenance.

(c) Prior Art and Problems Fig. 1 shows a perspective view of the external appearance of a housing for housing a conventional transceiver circuit module, which is the object of the present invention, and an outline of its configuration will be described.

In the figure, reference numeral 1 denotes a box-shaped housing for storing modular circuits, which is made by bending and forming a thin iron plate with a smooth surface, so-called a polished steel plate, and further finishing the surface with nickel plating or the like. Reference numeral 2 denotes a lid member that covers the upper opening of the housing 1, and is also made of the same material and subjected to the same surface treatment. The side surfaces 3 and 3' of the lid member 2 are bent into an L-shape to form a contact surface that overlaps with the open end surfaces 4 and 4' of the illustrated casing 1. 5 is a module circuit section assembled on a printed circuit board. For example, the module circuit is an IF (Internal
If it is a Frequency circuit) system component unit, the IF function circuit components (circuit components not shown) are mounted as integrated as possible.

Further, numeral 6 on the front surface of the housing 1 is a coaxial cable receptacle that is connected to a panel surface (not shown), and 7 is a switch for controlling the module circuit that is operated from the panel surface. Incidentally, a connection terminal for power supplying the module circuit and a plug-in type multi-connector (not shown) are attached to the rear side of the casing. 8 and 9 are screw fastening parts for fixing the lid member.

By the way, electromagnetic shielding in the conventional housing structure is achieved by mechanically coupling the lid member 2 and the housing 1 with screws 9 and grounding the housing. Electromagnetic radiation is difficult to avoid, and this poses a problem as it may cause interference between, for example, IF system circuits or between IF system circuits and microwave circuits in the panel configuration.

(d) Purpose of the invention The purpose of the invention is to solve the above-mentioned problems. That is, the objective is to completely shield the housing while maintaining the functionality that facilitates the assembly of modules forming conventional panel units and subsequent adjustment tests and inspections.

(e) Structure of the invention The above purpose is to provide a shielding structure for a box-shaped case that houses a functional component unit and a lid member, in which the case body has a side surface on the front side of the opening surface. The lid member has a bent opening surface that is bent along the opening surface, and an opening end surface that has a screw fastening section on the rear side. A bent step formed via the diagonally bent part that is inserted into the folded opening surface and comes into sliding contact, a screw fastening part provided on the rear side, and a peripheral part attached to the back side excluding the front side. and a flat spring member having a plurality of tilted tongues, the bent stepped portion of the lid member is inserted into the bent opening surface of the casing body, and the rear surface side of the lid member is pushed down and the screw fastened portion This is accomplished by fixing the device to the housing body with screws.

(f) Example of implementation of the invention The following is a second example of the module circuit shielding of the invention.
This will be explained in detail with reference to the perspective view of the housing configuration shown in the figure and the sectional view showing the main parts of the shielding function shown in FIG.

Figure 2 is an exploded view of the housing housing the IF system component unit, and compared to the previous figure, parts with equivalent functions are given the same reference numerals to make the gist of the invention clearer. .

This casing basically consists of a casing 1 made of a thin iron plate formed into a box shape, and a lid member 2 that covers the opening surface of the casing.

10 in the figure is a flat spring of the present invention on the back side of the lid member 2, and 11 is a decorative panel plate attached to the front side of the housing. The panel board 11 is fixed to the housing side with screws. 12 and 12' in the figure are screw through holes and screw holes on the housing side.

The flat spring 10 described above is constructed as follows.

That is, the back side of the lid member 2 has a thickness of 0.1, for example.
A flat spring member made by welding a nickel silver plate or the like for a spring of about [mm] is attached. Peripheral portion 1 of spring member 10
3, 14, and 15, a large number of tongues are punched out, and each tongue is preformed with an upward slope of 20 to 40 degrees. This corresponds to the opening end faces 16, 17 and 1 of the housing.
This is to obtain contact pressure (spring pressure) to obtain electrical continuity with 8.

The left and right ends 3 and 3' of the lid member are formed into a downward L-shape, but they may be formed into a U-shape. In the case of U-shaped molding, a recess for forming a rail is provided at the dotted line portion of the housing side end 4 in the figure, and the lid member is inserted from the rear of the housing. After insertion, mechanical fixation with screws 9 completes the electrical connection as described above.

Furthermore, the front side 20 of the lid member 2 is provided with a bent step 20 that comes into sliding contact with the opening surface 19 on the front surface of the housing (see FIG. 3).

FIG. 3 is a sectional view showing the main part of the shield formed on the front surface 19 of the casing having the above structure.

That is, when the lid member is completely attached, electrical continuity is obtained through the action of the tongue piece 14 of the spring 10, which is connected to the back surface of the lid by welding or the like, in close contact with the front surface 19 and side end surface 17 of the casing.

Note that the arrangement and number of coaxial cable receptacles 6 and the like provided on the front side are merely examples; various modifications may be made here depending on the circuit module function accommodated in the housing or the control function added.

(g) Effect of the invention According to the module storage case of the invention described in detail above, the case can be completely shielded for each module in the device configuration, and the IF system circuit and microwave waveguide can be shielded completely. Shielding between circuits or between IF system circuits is ensured. Furthermore, the casing has a structure that allows for easy internal adjustment and inspection, which has the advantage of simplifying device assembly tests, on-site tests, and maintenance.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a conventional circuit module storage case, FIG. 2 is a perspective view of the structure of the case according to an embodiment of the present invention, and FIG. 3 is a sectional view illustrating the shielding function. In the figure, 1 is a housing, 2 is a lid member, 5 is a module circuit part for board assembly, 6 is a receptacle, 10 is a flat spring member connected to 2 of the present invention, 13 and 14
and 15 are the tongue pieces of the spring member, and 16, 17, and 18
is the open end surface of 1 that comes into contact with the tongue piece.

Claims (1)

[Scope of Claim for Utility Model Registration] In the shielding structure of a box-shaped housing that houses a functional component unit and a lid member, the housing body has a part of the side opening on the front side of the opening surface. The lid member has a bent opening surface bent along the surface and an opening end surface having a screw fastening portion on the rear side, and the lid member has a bent portion provided on both opposing sides and the bent opening of the casing body provided on the front side. The folded step part formed via the diagonally bent part that is inserted into the surface and makes sliding contact, the screw fastening part provided on the rear side, and the peripheral part attached to the back side excluding the front side. a flat spring member formed with an inclined tongue; the bent step part of the lid member is inserted into the bent opening surface of the housing body, and the rear surface side of the lid member is pushed down so that the housing is fixed at the screw fastening part; The shielding structure of the housing is characterized by being fixed to the main body with screws.