JPH0731594Y2 - Assembly structure of converter for satellite broadcasting reception - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly structure for a satellite broadcast receiving converter.

[0002]

2. Description of the Related Art FIGS. 3A and 3B show an assembly structure of a conventional satellite broadcast receiving converter that is hermetically sealed by a cylindrical outer cover. FIG. 3A is a front view and FIG. It is a partial cutaway side view.

In FIG. 3, 1 is a cylindrical outer cover, 4 is a die casting case, 5 is an SHF circuit board, 6 is an intermediate frequency circuit board, 7 is a SHF circuit shield cover, 8 is an intermediate frequency circuit shield cover, 9 is a probe, 10 is a flange surface,
12 is a nut for fixing the outer cover, 13 is an output connector, 1
Reference numeral 4 is an O-ring, and 15 is an SHF circuit shield.

In this case, at the time of final assembling, the SHF circuit board 5, the SHF circuit shield 15, the intermediate frequency circuit board 6, the intermediate frequency circuit shield cover 8 and the like are assembled in the die casting case 4 from various directions, respectively, and the whole is assembled. Since it is configured by being covered with the cylindrical outer cover 1, it is not possible to carry out the assembling work from a single direction, which is unsuitable for automation and has a drawback of low productivity.

4A and 4B show the assembly structure of a conventional satellite broadcasting converter in which a frame-shaped die-casting case is hermetically sealed by upper and lower lids. FIG. 4A is a front view and FIG. It is a partially notched side view.

In FIG. 4, 2 is an upper lid, 3 is a lower lid, 4 is a frame-shaped die casting case, 5 is an SHF circuit board, 6 is an intermediate frequency circuit board, 9 is a probe, 10 is a flange surface, 1
Reference numeral 1 is a lid fixing screw, 13 is an output connector, and 14 is an O-ring.

In this case, the SHF circuit board 5 and the intermediate frequency circuit board 6 are assembled from the opposite directions,
Since the upper lid 2 and the lower lid 3 are separately airtightly configured, the same operation as described above cannot be carried out from a single direction, resulting in poor productivity in terms of automation and reliability of the airtight shield. Has a low drawback.

FIG. 5 shows an assembled structure of a conventional satellite broadcast converter in which an electronic circuit is formed on a single substrate, and a die-cast case having an upper opening is hermetically sealed only by an upper lid. The front view and the same figure (B) are partially cutaway side views.

In FIG. 5, 2 is an upper lid, 4 is a box-shaped die-casting case having an upper surface opening, 5 and 6 are SHF and an intermediate frequency circuit board, 9 is a probe, 10 is a flange surface, 11 is a set screw, and 13 is an output. The connector, 14 is an O-ring.

In this case, since the SHF and the intermediate frequency circuit boards 5 and 6 made of one sheet are assembled from the upper opening of the die casting case 4 and further the upper lid 2 is attached to form an airtight structure, the assembling work from a single direction. However, since the single SHF and the intermediate frequency circuit boards 5 and 6 are large in a plane, there is a drawback that the entire housing is wide and large.

[0011]

That is, in the assembling structure of the converter shown in FIGS. 3 and 4, at the final assembling stage, the assembling work cannot be carried out from a single direction, and there is a problem that productivity is poor in terms of automation. In the assembled structure of the converter shown in FIG. 4, there is no problem in productivity, but there is a problem in miniaturization.

The present invention has been made in view of the above problems.
To provide a small and highly reliable satellite broadcasting receiver assembly structure that enables assembly work from a single direction without increasing the size of the entire housing and improves productivity for assembly automation. With the goal.

[0013]

That is, a satellite broadcast receiving converter assembling structure according to the present invention has a die-casting case having a U-shaped cross-section having an opening on one side, and an inner peripheral surface of the die-casting case. A stepped portion formed substantially parallel to the opening surface, an intermediate frequency circuit board having an outer peripheral edge aligned with the stepped portion and having a circuit forming surface facing downward and a ground surface facing upward; A shield plate having an outer dimension corresponding to the inner dimension of the die casting case above the attachment part and mounted on the ground surface of the intermediate frequency circuit board; and a width dimension corresponding to the outer dimension of the shield plate. An SHF circuit board mounted on the surface of the shield plate with the ground surface facing downward and the circuit forming surface facing upward, and penetrated from the outer peripheral edge of the SHF circuit board to the shield plate or the intermediate frequency circuit board. Step above A substrate set screw tightened to, is constructed by a lid that hermetically an opening surface of the die-cast case.

[0014]

In other words, the assembling direction of each component module is always maintained in a single direction, which is the opening direction of the die casting case, which not only facilitates the automated configuration,
A highly reliable converter having a simplified airtight structure can be obtained. Further, the intermediate frequency circuit board and the SHF circuit board have a laminated integral structure in which the ground surfaces of the intermediate frequency circuit board and the SHF circuit board face each other through the shield plate, and a small converter can be obtained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1A and 1B show an assembly structure of a satellite broadcast receiving converter. FIG. 1A is an output end view thereof, and FIG. 1B is a partially cutaway side view thereof. FIG. 2 is a sectional view taken along line AA showing the assembly structure of the satellite broadcast receiving converter.

This satellite broadcast receiving converter is provided with a die-cast case 41 having a U-shaped cross section whose upper surface is an opening, as a housing, and when the completed modules are finally assembled in the die-cast case 41, an intermediate frequency circuit board is provided. 6, the shield plate 17, the SHF circuit board 5, the SHF circuit shield 15, and the SHF circuit shield lid 7 are sequentially assembled from the opening surface, and after the O-ring 14 is arranged, the upper lid 2 is fixed by the lid fixing screw 11 to be airtight. Composed. An output connector 13 is attached to the output end face side of the die casting case 41 together with the outer cover locking nut 12.

On the other hand, when the SHF circuit board 5 is assembled, the helical radiating element 9a is inserted from the signal input portion 41x of the die-cast case 41 to achieve the coupling with the SHF circuit. Next, a shield built-in structure of the intermediate frequency circuit board 6 and the SHF circuit board 5 with respect to the die-cast case 41 will be described.

That is, the die casting case 41 having a U-shaped cross section is provided with a stepped portion 41a parallel to the U-shaped opening surface with respect to the inner peripheral side surface thereof. The intermediate frequency circuit board 6 has its pattern surface 6a.
On the lower surface side and the ground surface 6b on the upper surface side.

On the ground plane 6b of the intermediate frequency circuit board 6, a shield plate 17 whose outer dimensions correspond to the inner peripheral dimensions of the die casting case 41 is mounted, and further on the surface of the shield plate 17. The SHF circuit board 5 having the same width as that of the shield plate 17 is placed with its pattern surface 5a facing the upper surface and its ground surface 5b facing the shield plate 17 side.

The intermediate frequency circuit board 6, the shield plate 17, and the SHF circuit board 5 are fastened to the stepped portion 41a of the die casting case 41 by the board set screws 16 penetrating through the outer edge portion at a plurality of locations. Fixed.

Here, the intermediate frequency circuit board 6 is to obtain an airtight shield structure surrounded by the die-cast case 41 and the shield plate 17. After that, on the pattern surface 5a of the SHF circuit board 5, the SHF circuit shield is formed. 15 and the SHF circuit shield lid 7 are sequentially attached.

Here, the SHF circuit board 5 has an airtight shield structure surrounded by the SHF circuit shield 15, the SHF circuit shield lid 7, and the shield plate 17.

The upper cover 2 is placed on the opening surface of the die-cast case 41 in which the above-mentioned completed modules are incorporated through the O-ring 14, and the upper cover 2 is fixed with the screw 1 for fixing the cover.
It is fixed by 1 and airtightness of the whole converter electric circuit is achieved.

Therefore, according to the assembling structure of the satellite broadcast receiving converter, the cross section U having one side surface as an opening surface.
A stepped portion 41a parallel to the opening surface is formed on the inner peripheral surface of the character-shaped die casting case 41.
The intermediate frequency circuit board 6, the shield plate 17, and the SHF circuit board 5 are sequentially mounted with the outer peripheral edge aligned with a, and the mounted and laminated intermediate frequency circuit board 6, the shield plate 17, and the SHF circuit board 5 are The stepped portion 41 is tightened and fixed by a board set screw 16 that penetrates from above, and further, SH
After mounting the F circuit shield 15 and the SHF circuit shield cover 7, one opening surface of the die casting case 41 is attached to the upper cover 2.
Since it is made airtight, the assembling direction of each component module can be always maintained in a single direction, which is the opening direction of the die casting case 41, and the automation configuration can be facilitated and the productivity can be improved. Alternatively, it is possible to obtain a highly reliable converter whose airtight structure is simplified.

Moreover, since the intermediate frequency circuit board 6 and the SHF circuit board 5 have a laminated integral structure in which the ground planes 6a, 5a face each other via the shield plate 17, a compact converter can be realized. .

Although the helical radiating element 9a is used as the signal input means of the converter in the above embodiment, a waveguide or other coaxial radiating element may be used as the signal input means. Good.

[0027]

As described above, according to the present invention, a die casting case having a U-shaped cross section having an opening on one side, and an inner peripheral surface of the die casting case are formed substantially parallel to the opening. The stepped portion, the intermediate frequency circuit board whose outer peripheral edge is fitted to the stepped portion, and whose circuit forming surface is the bottom and the ground surface is the top, and the inner dimension of the die-cast case above the stepped portion. A shield plate having a corresponding outer dimension and placed on the ground surface of the intermediate frequency circuit board, and a ground plate having a width dimension corresponding to the outer dimension of the shield plate and having the ground surface on the surface of the shield plate. An SHF circuit board that is placed with the circuit forming surface facing up, and a board stopper that penetrates from the outer peripheral edge of the SHF circuit board to the shield plate or the intermediate frequency circuit board and is tightened to the stepped portion. Screws and die casting above And a lid for hermetically closing one opening surface of the base, the intermediate frequency circuit board is enclosed and hermetically sealed by the shield plate and the die-cast case, and the SHF circuit board is enclosed by the shield plate, the die-cast case and lid. The airtight structure allows the assembly work from a single direction without increasing the size of the entire housing, improving productivity for assembly automation, and providing a compact and highly reliable satellite broadcasting reception. Can get a converter for.

[Brief description of drawings]

FIG. 1 is a view showing an assembly structure of a satellite broadcast receiving converter according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA showing the assembly structure of the satellite broadcast receiving converter.

FIG. 3 is a view showing an assembly structure of a conventional satellite broadcast receiving converter that is hermetically sealed by a cylindrical outer cover.

FIG. 4 is a view showing an assembled structure of a conventional satellite broadcast converter that is hermetically sealed by a top and bottom lid with respect to a frame-shaped die casting case.

FIG. 5 is a diagram showing an assembly structure of a conventional satellite broadcast converter in which an electronic circuit is formed on one substrate and a die-cast case having an upper surface opening is hermetically sealed only by an upper lid.

[Explanation of symbols]

2 ... Top lid, 5 ... SHF circuit board, 5a ... SHF circuit board pattern surface, 5b ... SHF circuit board ground surface, 6 ... Intermediate frequency circuit board, 6a ... Intermediate frequency circuit board pattern surface, 6
b ... Intermediate frequency circuit board ground plane, 7 ... SHF circuit shield lid, 9a ... Radiating element, 11 ... Lid set screw, 12 ... Outer cover fastening nut, 13 ... Output connector, 14 ... O-ring, 15 ... SHF circuit shield , 16 ... Board set screw,
17 ... Shield plate, 41 ... Die casting case, 41a ...
Stepped portion, 41x ... Signal input portion.

Claims (1)

[Scope of utility model registration request] 1. A die casting case having a U-shaped cross section having an opening on one side, a stepped portion formed on an inner peripheral surface of the die casting case substantially parallel to the opening surface, and a stepped portion on the stepped portion. An intermediate frequency circuit board having its outer peripheral edges aligned with each other, the circuit forming surface facing downward, and the ground surface facing upward; and the intermediate frequency circuit board having an outer dimension corresponding to the inner dimension of the die casting case above the stepped portion. A shield plate placed on the ground surface of the circuit board, and having a width dimension corresponding to the outer dimensions of the shield plate, with the ground surface facing downward and the circuit forming surface facing upward on the surface of the shield plate. The mounted SHF circuit board, a board set screw that penetrates from the outer peripheral edge of the SHF circuit board to the shield plate or the intermediate frequency circuit board and is tightened to the stepped portion, and one opening surface of the die casting case Airtight A satellite characterized in that the intermediate frequency circuit board is surrounded by the shield plate and the die-cast case to be airtight, and the SHF circuit board is surrounded by the shield plate, the die-cast case and the lid to be airtight. Assembling structure of broadcast receiving converter.