JP2578180Y2 - Frequency converter case 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 frequency converter case for receiving satellite broadcasting, which has a structure in which a main body chassis, a case cover, and a horn cap have a structure capable of providing accurate waterproofing and preferable high-frequency shielding by a single sealing material. It is possible to assemble, and the assembling operation is to obtain a simple mechanism.

[0002]

2. Description of the Related Art A frequency converter for receiving satellite broadcasting converts a radio wave reflected and focused by a reflector of a generally known parabolic antenna into a receiving frequency and guides it to a receiver, that is, a converter unit. , A case cover and a horn cap are attached to a main body chassis having a horn. However, since this type of converter is mainly set to an antenna used outdoors, the above-described components are used. Since it is necessary to assemble the body with a waterproof seal and also a high-frequency shielding property for preventing leakage or mixing of signals from the waterproof seal portion is proposed, its structure has been proposed as such.

That is, Japanese Unexamined Utility Model Application Publication No. 60-90903 and Japanese Utility Model Application Laid-Open No. 61-162106 or Japanese Utility Model Application Publication No. 64-658 have been published for this purpose.
No. 0 publication.

In the above-mentioned Japanese Utility Model Application Laid-Open No. 60-90903, a packing is received by arranging a concave groove in a flange-shaped end surface of a main body made of a metal material having good conductivity. An annular fixing portion in which a ring material having an L-shaped cross section is attached to the packing and the end surface, and an L-shaped step portion of the ring material is engaged with a male screw thread formed on the outer periphery of the flanged end of the main body. The packing is pressed and tightened to press the packing into the concave groove and seal the packing with the ring material bottom surface.

In Japanese Utility Model Laid-Open Publication No. 61-162106, two concave grooves are formed on the outer periphery of the opening end of the main body, a packing material is fitted into the concave groove on the opening end side, and the cover is covered. The other groove is fastened from the outer periphery of the cover body by a coiled ring.

In Japanese Utility Model Publication No. 64-6580, packing is housed and set in a groove formed in a flange formed at one end of a main body, which is the same as that described above. The plate and the holding plate are overlapped and tightened by a large number of screws to form a seal between the flange and the dielectric plate.

[0007]

However, the above-described conventional apparatus has disadvantages such as a complicated structure, a considerable number of steps required for assembly, and a difficulty in obtaining an effective waterproof seal and a high-frequency shield. . That is, in the above-mentioned Japanese Utility Model Publication No. 64-6580, many steps are required for the operation of tightening a large number of screws, and moreover, in the actual converter case, a plurality of seal portions are provided, which is complicated. However, there is a disadvantage that the sealing action is insufficient because sufficient pressure cannot be obtained against the sealing material.

In Japanese Unexamined Utility Model Publication No. 60-90903, the sealing condition is determined by screwing and tightening of the annular fixing portion. However, the screwing of the annular fixing portion to the outer periphery of the flange-like end is not necessarily uniform. It is difficult to obtain an effective seal in any case, such as by using a plurality of seals for the high-frequency shield. It has to be expensive.

In the case of Japanese Utility Model Application Laid-Open No. 61-162106, even if a cap is placed on the opening end of the main body, it is lightly joined to the peripheral side of the packing in the groove. The pressing action is hardly obtained, and the use of a ring made of a special material is not inexpensive and is extremely insufficient for long-term outdoor use due to its structure and the like.

[0010]

SUMMARY OF THE INVENTION The present invention has been studied to solve the above-mentioned technical problems in the prior art, and employs a single packing material for a joint portion of main components and a cap member. The seal is tightly sealed to the packing material by a slight rotation, and the seal is easy to handle and a stable seal is formed, as follows.

(1) An opening end of a case cover is attached to a flange of a main body chassis having a horn, an annular packing made of conductive rubber is set between the flange and the opening, and the horn is mounted. A horn for forming a projection for pressing the annular packing on the peripheral side of the horn cap to be covered, and having a locking claw guided and locked by a taper guide formed on a flange on the outer periphery of the horn. A frequency converter case for receiving satellite broadcasting, wherein the frequency converter case is formed on an inner peripheral side surface of a cap.

(2) A plurality of combinations of small projections and stop projections adjacently arranged on the outer peripheral side of the horn portion are equally disposed, and the small projections and the stop projections are arranged on the inner peripheral side surface of the horn cap. The frequency converter case for receiving satellite broadcasting according to the above item (1), wherein a fitting projection is provided so as to be locked between the first and second portions.

[0013]

The opening of the case cover is attached to the flange of the main body chassis having the horn, and an annular packing material made of conductive rubber is set between the flange and the opening to cover the horn. By forming a projection for pressing the annular packing on the peripheral side of the horn cap, sealing between the main body chassis (its flange portion), the case cover, and the three members of the horn cap can be simultaneously achieved by a single annular packing material. . In addition, a high-frequency shield and a ground contact inside the converter are effectively formed by a packing material made of conductive rubber.

By forming a tapered guide on the flange portion on the outer periphery of the horn portion as described above, and forming a locking claw portion guided and locked by the tapered guide on the horn cap, the horn cap is provided. By just fitting and turning moderately, the locking claw portion of the horn cap is guided by the tapered guide, and the protrusion pressed by the horn cap is pulled into the case cover, and the protrusion is Pressing the annular packing material between the case cover and the case cover completes a perfect waterproof seal between the three members.

A combination of a small projection and a stop projection adjacent to each other on the outer peripheral side of the horn portion is disposed at a plurality of locations, and a fitting projection is provided on the inner peripheral side surface of one of the horn caps. The horn cap is provided so as to be locked in the relationship between the small projection and the stop projection of the horn, thereby defining the rotation range of the horn cap as described above. That is, the rotation of the horn cap is stopped by the engagement projection of the horn cap exceeding the small projection due to its rotation and joining at the stop projection. In addition, the small protrusion prevents reverse rotation of the horn cap due to a small acting force, so that the horn cap forms a favorable fixing state for the horn portion and the case cover.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a device according to the present invention; FIG. 3 is a horn cap shown in FIG. 3 and FIG. 4 is a horn mounted on a case cover, and FIGS. 5 to 8 show states of engagement and locking between each other for mounting the horn cap on the horn. Is a partial detailed view showing a cross-sectional view.

That is, a main body chassis 1 having a horn portion 4 formed of a conductive material by molding or the like, a metal case cover 2 and a horn cap 3 made of a resin material are attached, and a horn portion 4 protruding from one end of the case cover 2 is provided. A horn cap 3 is attached so as to enclose the output plug seat 5, and an output plug seat 5 mounted on the main body chassis 1 is exposed from the other end of the case cover 2 and fixed.
It is designed to be connected to a receiver or the like by a coaxial cable.

FIG. 2 is a schematic view of the main body 1 according to the present invention. A flange 10 is formed at the boundary of the main body chassis 1 and the horn 4, and a curved surface is formed on the outer peripheral edge of the flange 10. A portion 10a is formed to receive an annular packing material 6 such as an O-ring made of conductive rubber, and a case cover 2 that covers the main body chassis 1 is fitted to the outside of the annular packing material 6 as shown by an arrow, and an output plug seat 5 is formed. Is fixed by a fastening member, whereby the end 21 of the case cover 2 is positioned, and the horn cap 3 is fitted as shown by the arrow in the annular packing material 6 set in such an assembly, and the tip 31 is formed. Is pressed as shown in the partial sectional view of FIG.

The specific configuration of the sealing state of the annular packing material 6 by the pressing of the horn cap 3 is as shown in FIGS. 3 to 8, and as is apparent from FIGS. A chord-shaped notch 7 is provided on the outer peripheral flange portion 41 in an equiangular relationship, and a tapered guide 71 is formed in the notch portion, while the horn cap 3 matches the notch portion 7. Locking claw portions 8 are disposed in an equiangular relationship.

As shown in FIG. 3, the locking claw portion 8 is engaged with the flange portion 41 at an intermediate depth of the inner peripheral side surface of the horn cap 3, that is, when the annular packing material 6 is pressed against the case cover 2. As shown in the figure, the inclined surface 8a is formed in the depth direction from the opening side as shown in the figure, and the locking claw portion 8 is formed in the notch 7 in the flange portion 41 as shown in FIGS. 5 and 6 by turning the horn cap 3 counterclockwise when it is fitted.
As shown in the figure, the leading end 31 of the cap 3 is guided by the tapered guide 71 of the notch 7 so that the tip end 31 of the cap 3 can tighten the annular packing material 6 into a deformed pressing state as shown in the figure, and Case cover 2
And an effective seal between the horn cap 3.

The horn cap 3 is generally formed of a resinous material.
As shown in FIG. 6, forming a seal by forcing the annular packing material 6 such as a ring into a taper step 22 in the end 21 of the case cover 2 causes the flange 10
And the horn cap 3 is set with the annular packing material 6 made of the conductive rubber positioned on the curved surface portion 10a on the outer peripheral edge of the flange portion 10, whereby a favorable high-frequency shielding property is obtained by forming a compressed seal. Can be

Further, according to the present invention, as shown in FIG. 3 to FIG.
and a fitting projection 32 is provided so as to be connected adjacent to the inner peripheral surface of the horn cap 3 and to be locked between the two projections 9 and 9a.

That is, when the horn cap 3 is rotated as described above, the fitting projection 32 and the small projection 9 can be appropriately moved over by applying a slight force. 9a, the horn cap 3 is stopped by the stop projection 9a. In other words, in the state where the fitting projection 32 is always located between the small projection 9 and the stop projection 9a, the seal is most effectively obtained by the pressing deformation of the annular packing material 6, and this state is maintained continuously. Made up of

When it is desired to remove the horn cap 3, the above-mentioned mutual locking relationship is released and the horn cap 3 can be removed by inverting the horn cap 3 slightly in reverse to the mounting described above.

According to the present invention as described above, the main body chassis 1, the case cover 2 and the horn cap 3 are effectively sealed by the single annular packing material 6 to complete a waterproof structure, and also have a high frequency shielding property and a grounding relation. This is properly achieved by using a conductive rubber as a packing material, and the structural relationship between them is greatly simplified as compared with the conventional technology.

The horn cap 3 has weather resistance and
It is preferable that the horn cap 3 is made of heat-resistant resin.
Since the structure in which the range in which the packing material 6 can be accommodated is specified even when compressed is adopted, a product excellent in appearance can be obtained by performing a surface treatment on the case cover 2. The case cover does not require thread formation or other secondary processing, and is easy to manufacture and assemble.

[0027]

According to the present invention as described above, an effective waterproof seal relation can be formed with respect to each of the main members of the main body chassis, the case cover and the horn cap by using a single packing material, and the material of the packing material The use of conductive rubber as a material can enhance the high-frequency shield of the electronic circuit chamber in the converter, greatly simplifying their configuration, and forming the above-mentioned seal with a slight rotation of the horn cap and its cover. It has an effect that the removal operation can be easily obtained and the handling thereof can be simplified and speedy, and is a device which is industrially large in its effect.

[Brief description of the drawings]

FIG. 1 is a cutaway view of a main part of a frequency converter according to the present invention.

FIG. 2 is a partial cross-sectional view of a part of the main component of the present invention in which the main component is disassembled.

FIG. 3 is a perspective view of a horn cap.

FIG. 4 is a perspective view of a cutaway part of a main part horn part and a taper guide, with a part of a case cover to which a main body chassis is attached is omitted.

FIG. 5 is a diagram showing only a locking relationship between an outer periphery of a horn portion and a horn cap.

FIG. 6 is a diagram showing a cross section of a case cover and a horn cap in the relationship of FIG. 5;

FIG. 7 is a view showing the relationship of FIG. 8 in section of a case cover and a horn cap.

FIG. 8 is a diagram showing only a fitting relationship between an outer periphery of a horn portion and a horn cap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body chassis 2 Case cover 3 Horn cap 4 Horn part 5 Output plug seat 6 Annular packing material 7 Notch part 8 Locking claw part 8a Inclined surface 9 Small projection part 9a Stop projection part 10 Flange part 10a Curved part 21 End part 22 Taper step 31 Tip 32 Fitting projection 41 Flange 71 Taper guide

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 5-48406 (JP, U) JP-A 2-49234 (JP, U) JP-A 60-90903 (JP, U) JP-A 61- 162106 (JP, U) Jiko 64-6580 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04B 1/08 H01Q 1/02

Claims (2)

(57) [Scope of request for utility model registration] 1. An opening end of a case cover is attached to a flange portion of a main body chassis having a horn portion, and an annular packing made of conductive rubber is set between the flange portion and the opening end;
A projection for pressing the annular packing is formed on a peripheral side of a horn cap that covers the horn, and a locking claw guided and locked by a taper guide formed on a flange on the outer periphery of the horn. Is formed on an inner peripheral side surface of the horn cap. 2. A combination of a small projection and a stop projection adjacent to each other on the outer peripheral side of a horn part, and the small projection and the stop projection are provided on the inner peripheral side surface of the horn cap. 2. The frequency converter case for receiving satellite broadcasting according to claim 1, further comprising a fitting projection adapted to be locked between the case and the projection.