JPH0574033U - Frequency converter case for satellite broadcasting reception - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a frequency converter case for satellite broadcast reception, which has a preferable high-frequency shielding property by accurately waterproofing a main body chassis, a case cover and a horn cap with a single sealing material. [Structure] Collar portion 10 of main body chassis 1 having horn portion 4
On the other hand, the opening end of the case cover 2 is attached, and the ring-shaped packing 6 made of conductive rubber is set between the collar portion 10 and the opening end to cover the horn portion 4.
The horn is provided with a protrusion for pressing the annular packing 6 on the circumferential side of the horn, and the locking claw 8 guided and locked by the taper guide 71 formed on the flange 41 on the outer periphery of the horn. It is formed on the inner peripheral side surface of the cap 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a frequency converter case for satellite broadcasting reception, and a main chassis, a case cover and a horn cap can be assembled with a structure that obtains proper waterproofing and preferable high frequency shield property by a single sealing material. However, the assembling operation is also intended to obtain a simple mechanism.

[0002]

[Prior Art]

 A frequency converter for satellite broadcasting reception converts the radio waves reflected by a reflector of a generally known parabolic antenna and focused to a reception frequency and guides it to the receiver, that is, it is a converter unit and has a horn. It is constructed by attaching a case cover and horn cap to the main body chassis, but since this type of converter is mainly set for outdoor use antennas, the above-mentioned parts are waterproof. Since it is necessary to assemble by assembling and a high-frequency shield property for preventing leakage or mixing of signals from the waterproof seal portion is required, the structure has been proposed as such.

That is, as those conventionally announced for such purposes, there are Japanese Utility Model Laid-Open No. 60-90903, Japanese Utility Model Laid-Open No. 61-162106, Japanese Utility Model Laid-Open No. 64-6580, and the like.

In the above-mentioned Japanese Utility Model Laid-Open No. 60-90903, a flange is formed on a flange-shaped end face of a main body made of a metal material having good conductivity, and a groove is formed in the groove to receive packing. A ring member having an L-shaped cross section is attached to the packing and the end surface, and an annular fixing is engaged with the L-shaped stepped portion of the ring member with a male screw thread formed on the outer periphery of the furanoji-shaped end portion of the main body. The packing is press-fitted into the groove to seal the gap with the bottom surface of the ring member.

In the above-mentioned Japanese Utility Model Laid-Open No. 61-162106, two concave grooves are formed on the outer periphery of the opening end of the main body, and a packing material is fitted in the concave groove on the opening end side to cover the cover body. It is fixed to the other groove from the outer circumference of the cover body by a coiled ring.

Further, in Japanese Utility Model Publication No. 64-6580, as in the case described above, packing is accommodated and set in a groove circularly provided in a collar-shaped part formed at one end of the main body, and the dielectric The body plate and the holding plate are overlapped and tightened with a large number of screws to form a seal between the collar-shaped portion and the dielectric plate.

[0007]

[Problems to be solved by the device]

 However, the above-mentioned conventional ones have disadvantages such as a complicated structure, a considerable amount of labor is required for assembly, and it is difficult to obtain 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 tightening a large number of screws, and in the actual converter case, a plurality of seal portions are provided. It is disadvantageous in that it is complicated and that the sealing action is insufficient because sufficient pressure cannot be applied to the sealing material.

In Japanese Utility Model Laid-Open No. 60-90903, the sealing condition is determined by the tightening and tightening of the annular fixing member, but it is not necessary to screw the annular fixing member to the outer circumference of the flange-shaped end. However, the tightening is not uniform, and the tightening with respect to the packing is indirect through the L-shaped ring material, and it is difficult to obtain an effective seal by using multiple sealing parts for the high frequency shield. In addition, the number of parts is large and it must be expensive.

[0009] In Japanese Utility Model Laid-Open No. 61-162106, even if the opening end of the main body is covered with a cap, it is lightly joined to the circumferential side of the packing in the groove, so that the packing can be easily assembled. Since the pressing action of the ring is hardly obtained, it is not cheap to use a ring made of a special material, and it is very insufficient for outdoor use for a long period due to its structure.

[0010]

[Means for Solving the Problems]

 The present invention has been studied to solve the above-mentioned technical problems in the conventional one, and adopts a single packing material for the joint portion of the main constituent members, and the packing member can be moved by a slight rotation of the cap member. It succeeded in forming a stable and easy-to-handle seal by performing a pressure seal against the material, and is as follows.

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

(2) A plurality of combinations of small protrusions and stop protrusions adjacent to each other are evenly arranged on the outer peripheral side of the horn portion, and the small protrusions and the stop portions are provided on the inner peripheral side surface of the horn cap. The satellite broadcast receiving frequency converter case described in the above item (1), characterized in that a fitting projection adapted to be locked between the projection and the projection is provided.

[0013]

[Action]

 Attach the open end of the case cover to the flange part of the main body chassis having the horn part, and set the ring-shaped packing material made of conductive rubber between the flange part and the open end of the horn cap that covers the horn part. By forming a protrusion that presses the annular packing on the peripheral side, a single annular packing material simultaneously achieves the seal between the main body chassis (its flange portion), the case cover and the horn cap. In addition, the packing material made of conductive rubber effectively configures the high-frequency shield and ground contact inside the converter.

The taper guide is formed on the flange portion of the outer periphery of the horn portion as described above, and the locking claw portion that is guided and locked by the taper guide is formed on the horn cap. Simply by fitting the cap and rotating it appropriately, the locking claws of the horn cap are guided by the taper guide, and the protrusion of the horn cap that is pressed is drawn into the case cover. Pressing the annular packing material between the case cover and the case cover completes the perfect waterproof seal between these three parts.

A combination of small protrusions and stop protrusions adjacent to each other is arranged at a plurality of locations on the outer peripheral side of the horn portion, and a fitting protrusion is provided on the inner peripheral side surface of one of the horn caps. The pivot range of the horn cap as described above is defined by arranging the horn cap so that it can be locked by the relationship between the small protrusion of the horn and the stop protrusion. That is, the rotation of the horn cap is stopped by the fitting protrusion of the horn cap exceeding the small protrusion by the rotation thereof and joining at the stop protrusion. Moreover, the small protrusion also prevents reverse rotation of the horn cap due to a slight acting force, so that the horn cap forms a favorable fixing state on the horn part and the case cover.

[0016]

【Example】

 A specific embodiment of the present invention as described above will be described with reference to the accompanying drawings. The overall external structure of the present invention is as shown in FIGS. 1 and 2, and the essential parts of the invention. 4 shows the horn cap of FIG. 3 and FIG. 4 shows the horn part attached to the case cover, and FIGS. 5 to 8 show the state of engagement and locking between the horn cap and the horn part. It is a detailed view showing a part and a sectional view.

That is, a main body chassis 1 having a horn portion 4 formed by a conductive material, a metal case cover 2 and a resinous horn cap 3 are mounted, and a horn portion 4 protruding from one end of the case cover 2 is mounted. A horn cap 3 is attached to enclose the output connector 5 and the output connector 5 mounted on the chassis 1 is exposed and fixed from the other end of the case cover 2. It is designed to be connected to a receiver, etc.

2, the outline of the present invention will be described with reference to FIG. 2. As described above, the flange portion 10 is formed at the boundary portion with the horn portion 4 of the main body chassis 1, and the curved surface is formed on the outer peripheral edge of the flange portion 10. The 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 for covering the main body chassis 1 is fitted on the outer side of the annular packing material 6 as shown by an arrow to form an output connector. By fixing 5 with a fastening member, the end 21 of the case cover 2 is positioned, and the horn cap 3 is fitted as shown by the arrow to the ring-shaped packing material 6 set by such assembly. The tip 31 is pressed to become as shown in the partial sectional view of FIG.

A concrete 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. 3 and 4, the horn portion is clear. 4 is provided with a chord-shaped notch 7 in an equiangular relationship on the outer peripheral flange portion 41, and a taper guide 71 is formed in the notch while the notch 7 is provided on the horn cap 3. The locking claw portions 8 that meet the above are arranged in an equiangular relationship.

As shown in FIG. 3, the locking claw portion 8 has a middle depth on the inner peripheral side surface of the horn cap 3, that is, the flange portion 41 when the annular packing material 6 is pressed against the case cover 2. The slanted surface 8a is formed at a position where the locking claw portion 8 is engaged with the recessed portion 8a in the depth direction from the opening side as shown in FIG. When the horn cap 3 is fitted in such a manner, the horn cap 3 is rotated counterclockwise to be guided by the taper guide 71 of the cutout portion 7 as shown in FIGS. 31 enables the annular packing material 6 to be clamped in the deformed and pressed state as shown in the drawing, thereby forming an effective sealed state between the main body chassis 1, the case cover 2 and the horn cap 3.

The horn cap 3 is generally formed of a resin material, and a ring-shaped packing material 6 such as an O-ring is strongly pressed at the tip 31 of the horn cap 3 to form a seal as shown in FIG. That is, the flange portion 10 of the main body chassis 1 abuts the tapered step portion 22 in the end portion 21 of the case cover 2, and the annular packing material 6 made of the above-mentioned conductive rubber is attached to the curved surface portion 10a of the outer peripheral edge of the flange portion 10. By setting the horn cap 3 at the position, a preferable high-frequency shielding property can be obtained by forming a compressed seal.

Further, according to the present invention, as shown in FIG. 3 to FIG. 8, a small protrusion 9 and a stop protrusion 9a are continuously provided adjacent to the outer peripheral side surface of the horn portion 4 and the inner peripheral surface of the horn cap 3 is connected. A fitting projection 32 is provided so as to be locked between the projections 9 and 9a provided adjacent to each other.

That is, as described above, when the horn cap 3 is rotated, the fitting projection 32 and the small projection 9 can be appropriately overcome by applying a slight force, but the fitting projection 32 and the stop projection 9 9a cannot be overcome, and the rotation of the horn cap 3 is stopped by the stop projection 9a. That is, with the fitting protrusion 32 always positioned between the small protrusion 9 and the stop protrusion 9a, the seal is most effectively obtained by the pressing deformation of the annular packing material 6, and this state is maintained continuously. Made of

When it is desired to remove the horn cap 3, the mutual locking relationship described above can be released and removed by slightly reversing the horn cap 3 contrary to the above mounting.

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 only annular packing material 6 to complete the waterproof structure, and the high frequency shielding property and the earth relation are also provided. These are properly achieved by using conductive rubber as a packing material, and their structural relationship is greatly simplified compared to that of the prior art.

The horn cap 3 is preferably made of a weather-resistant and heat-resistant resin, and the horn cap 3 according to the present invention has a ring-shaped packing material 6 even if it is compressed. Since the structure that regulates the range of 6 is adopted, surface-treating the case cover 2 gives a product with excellent appearance, and the horn cap and case cover described above are formed with threads. It is easy to manufacture and assemble without requiring other secondary processing.

[0027]

[Effect of the device]

 According to the present invention as described above, a single packing material can form an effective waterproof seal relationship for each of the main body chassis, case cover and horn cap, and the packing material is made of conductive rubber. It is possible to enhance the high-frequency shield of the electronic circuit room in the converter by significantly improving the structural relationship between them and forming the above-mentioned seal with a slight rotation of the horn cap and removing the cover. It has advantages such as that it can be easily obtained and can be handled easily and quickly, and it is a device having a great effect industrially.

[Brief description of 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 component part obtained by disassembling a main component part according to the present invention.

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

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

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

FIG. 6 is a cross-sectional view of the case cover and horn cap of the relationship shown in FIG.

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

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

[Explanation of symbols]

 1 Body Chassis 2 Case Cover 3 Horn Cap 4 Horn Part 5 Output Plug Seat 6 Annular Packing Material 7 Notch 8 Locking Claw 8a Sloping Surface 9 Small Projection 9a Stop Projection 10 Collar 10a Curved Surface 21 End 22 Tapered step 31 Tip 32 Fitting protrusion 41 Flange 71 Taper guide

Claims (2)

[Scope of utility model registration request] 1. An opening end of a case cover is attached to a collar portion of a main body chassis having a horn portion, and an annular packing made of conductive rubber is set between the collar portion and the opening end.
A locking claw part is formed on the peripheral side of a horn cap that covers the horn part, and a protruding part for pressing the annular packing is formed, and is guided and locked by a taper guide formed on a flange part on the outer periphery of the horn part. A frequency converter case for satellite broadcasting reception, characterized in that the above is formed on the inner peripheral side surface of the horn cap. 2. A plurality of combinations in which small protrusions and stop protrusions are adjacent to each other are evenly arranged on the outer peripheral side of the horn portion, and the small protrusions and the stop protrusions are formed on the inner peripheral side surface of the horn cap. The frequency converter case for satellite broadcast reception according to claim 1, further comprising a fitting protrusion that is locked between the fitting and the projection.