JP3069475B2 - Converter for satellite broadcasting reception - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a converter for receiving satellite broadcasting, and more particularly to a frequency adjustment mechanism structure of a converter (Low Noise Block Down Converter, hereinafter referred to as LNB) having a local adjustment mechanism.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG . FIG. 3 is a sectional view of a main part of a conventional LNB.
As shown in FIG. 3 , a circuit board 21 is fixed to the chassis 20, and a resonator 22 is fixed to the circuit board 21. The chassis 20 is provided with a local adjustment screw (hereinafter simply referred to as a screw) 23 which is inserted and fixed from the outside, and a distance l between the screw 23 and the resonator 22 is provided.
Adjusts the local frequency.

This local frequency adjustment is very delicate, and in order to prevent rattling between the male screw of the screw 23 and the female screw of the chassis 20, conventionally, a part of the male screw of the screw 23 for fixing is used. The resin 24 is applied to stop the play.

In order to prevent moisture and moisture from entering the resonator side from the outside air side and to completely fix the screw 23, a recess 25 is provided outside the chassis.
5, a liquid sealant 26 is injected.

Further, radiation leaking from the inside to the outside is prevented by press-fitting the metal cover 27 into the outer periphery of the concave portion 25 outside the chassis 20.

[0006]

In the prior art shown in FIG. 3 , the fixing resin 24 is applied to prevent the screw 23 from rattling, and the liquid sealing agent 2 is applied.
6 had to be injected into the recess 25, which was costly. Further, the liquid sealant 26 needs to be left for a certain period of time or more after the injection until the surface is solidified, and the productivity is not good.

[0007] Further, at the time of readjustment, the liquid sealant 26 must be completely removed, and this operation also requires much labor.

Further, since the metal cover 27 for preventing radiation is a press-fit type, it requires dimensional accuracy between the outer dimension of the concave portion 25 and the inner dimension of the metal cover 27, and furthermore, it is necessary to readjust. When it becomes necessary, there is a problem that it is difficult to remove and cannot be reused.

As described above, the structure of the prior art has a low productivity, requires a great deal of time for readjustment, and is wasteful and costly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a useful converter for satellite broadcast reception which has a simple structure, is excellent in productivity, and can be easily readjusted.

[0011]

In order to achieve the above object, the present invention comprises a resonator provided in a chassis and an adjusting screw inserted into the chassis from outside, wherein the resonator and the adjustment are provided. the satellite broadcast receiving converter which performs frequency adjustment by adjusting the distance between the use bis, prior
The adjusting screw is provided on the entire side surface of the screw with a sealing resin material or
Is formed of a rubber material, and above the adjustment screw side surface
And between the chassis, around the adjustment screw
In this case, a conical spiral metal spring is provided.

[0012]

[0013]

[0014]

[0015]

[Function] A sealing resin material or rubber
Rattling can be prevented by forming the
Also, a conical spiral metal splice around the side of the adjusting screw
Since the ring is provided, external radiation can be prevented. in this way
According to the present invention, no liquid sealant is used as in the prior art.
It is not necessary to take time for solidification of the surface.
Production efficiency is improved. In addition, readjustment of the frequency
Relatively easy to perform because there is no need to remove the sealant
You. In addition, press fit as before to prevent radiation to the outside
Unable to use after re-adjustment because the metal cover of the formula is not used
There is no waste.

[0016]

[0017]

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. FIG. 1 is a sectional view of a main part of a converter for receiving satellite broadcasting according to the present embodiment. The same symbols are given to the same functional parts as the conventional example shown in FIG . Here, only the points different from the conventional example will be mainly described.

[0019]

[0020]

[0021]

[0022]

In this embodiment, the male screw of the screw 7 is
Resin 8 or rubber material 8 is formed.
You. This structure prevents the backlash of the screw 7 and the confidentiality
Both of the above effects are obtained. Further, in this example, as a means for preventing radiation, a conical spiral metal spring 9 is used.
Is provided between the screw 7 and the chassis 20. The helical metal spring 9 is freely deformed as shown in FIG. 2 in response to the rotation of the screw 7, but even if it is deformed in this way, the spring
Since there is little change in the gap between the wires of the spring 9, the spring 9
Radiation to the outside through the gap can be prevented. Also, Spring
The wires do not hit each other for the vertical expansion and contraction of
Therefore, it is possible to increase the moving amount of the screw 7 and widen the adjustment range.
There are points.

[0024]

As described above, in this embodiment, since no liquid sealing agent is used unlike the conventional case, it is not necessary to take time for solidifying the surface, and the production efficiency is improved as compared with the conventional case.

Further, the readjustment of the frequency is relatively easy because there is no need to remove the liquid sealant. In addition, since a press-fitting metal cover is not used to prevent radiation to the outside as in the related art, there is no waste that cannot be used after readjustment.

[0027]

As described above, according to the present invention, it is possible to prevent rattling of the local adjustment screw with a simple structure, reliably prevent radiation, and easily adjust the frequency. A receiving converter can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a converter for receiving satellite broadcasting according to an embodiment of the present invention.

FIG. 2 shows the operation of the satellite broadcast receiving converter of FIG .
It is sectional drawing.

FIG. 3 is a cross-sectional view of a conventional satellite broadcast receiving converter.
FIG.

[Explanation of symbols]

 7 Adjusting screw 8 Sealing resin material (rubber material) 9 Spiral metal spring 12 Resonator 20 Chassis

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-2-277301 (JP, A) JP-A-4-64816 (JP, U) JP-A-5-27321 (JP, U) JP-A-60- 150802 (JP, U) JP-A 63-113304 (JP, U) JP-A 58-82001 (JP, U) JP-A 5-53301 (JP, U) Japan Institute of Invention and Innovation Technical Report Official Technical Number 91-20551 HISTP 7/10 H03B 5/18 Field of Study (Int.Cl. ⁷ , DB name)

Claims (1)

(57) [Claims] 1. A satellite having a resonator provided in a chassis and an adjusting screw inserted into the chassis from the outside, and performing a frequency adjustment by adjusting a distance between the resonator and the adjusting screw. In the broadcast receiving converter, the adjusting screw is provided on the entire side surface of the screw with a sealing resin material.
Or a rubber material, which is located above the side of the adjusting screw.
And between the chassis and the adjustment screw
As described above, wherein a conical spiral metal spring is disposed .