JPS62217705A - Dish for parabolic antenna - Google Patents

Abstract

PURPOSE:To reduce the wind pressure and to attain the light weight by providing a flange reinforcement part to the peripheral of a dish and forming a vent hole up to this side of a folded ridge line of said reinforcement part in excess of a prescribed rate of a radio wave reflecting face of the dish. CONSTITUTION:The flange reinforcement part 7 is provided to the peripheral of the dish 5 of the antenna, no vent hole 2' is provided near the ridge line at a circumferential flange rising part 6 and a radio wave reflecting face 9 of said flange folded ridge line part 8 but vent holes 2' as many as possible are provided to all the reflecting faces to the outside of, e.g., 80% of the radius of the face 9. Thus, the weight of the dish 5 of the parabolic antenna itself is reduced and the wind pressure exerted onto the dish 5 is decreased by the vent holes 2'. Further, the porous plate part formed by providing many vent holes 2' to the radio wave reflecting face 9 and the part at the inside of the ridge line of the peripheral flange reinforcement part 7 without vent hole are formed incorporatedly by the same curvature face to improve the reflecting face accuracy of the received radio wave and the reflected radio wave with excellent quality is collected to a converter 20 so as to improve the reception performance as a parabolic antenna.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a dish for a parabolic antenna, and particularly relates to a parabolic antenna with ventilation holes suitable for reducing the wind pressure applied to the parabolic surface and reducing the weight at the same time. Regarding Ditshu.

[Conventional technology]

The traditional parabolic antenna dish that creates a lattice-like radio wave reflecting surface uses punched metal sheets and expansion metal sheets.The outside MI7 flange part is also molded as one piece, and the outer periphery reinforcement part is made as a separate part. The above-mentioned flange part is fixed to this with welding or screws, etc. to form a dish of a parabolic antenna, or a curved surface is formed between the foreign reinforcement part and radial ribs placed on the back side of the radio wave reflecting surface. Alternatively, a radio wave reflecting surface made of a mesh metal plate formed into a curved surface was attached to serve as a dish for a parabolic antenna.

Furthermore, the dish of the parabolic antenna having ventilation holes described in JP-A No. 53-70740 has a shape in which the rows of ventilation holes are arranged in a circular arrangement, and each hole plate has a large area relative to the entire area of the dish. The area of the section was relatively small.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology requires a separate outer peripheral sleeve reinforcement or ribs on the outer edge of the dish, and consideration must be given to reducing the weight of the dish itself and ensuring the strength of the dish without attaching separate parts. However, the weight of the dish increases, making it difficult to maintain the parabolic antenna.Also, the outer reinforcement assembly, which is a separate part, needs to be manufactured with high precision, which increases the cost of parts. There was a problem with that. In addition, the location of the row of ventilation holes provided on the radio wave reflecting surface is at a radius of 309 to 8096 points from the center, and the reduction rate of wind pressure can be calculated by subtracting it using the building wind calculation force method. The maximum reduction was 329 b, which was not necessarily sufficient, and no consideration was given to reducing Nk.

The purpose of the present invention is to ensure the strength of the dish by reinforcing the outer periphery of the dish, which is formed by the dish itself, and to provide as many ventilation holes as possible to reduce the wind blowing pressure of the dish and to reduce the weight of the mold plate. Our objective is to provide a parabolic antenna that can reduce manufacturing costs for separate parts and improve performance.

[Means for solving problems]

The above object is to provide a flange reinforcement part on the outer periphery of a dish for a parabolic antenna that is attached to the mounting bracket of one antenna of a dish of a parabolic antenna, and to provide a flange reinforcement part on the outer periphery of the dish, and to provide a flange reinforcement part on the radio wave reflecting surface side of the 7-range bent ridgeline part. This is achieved by not providing ventilation holes along the ridgeline, but by providing as many ventilation holes as possible to the outside of 80% or more of the radius of the radio wave reflecting surface.

[Effect]

A peripheral reinforcement part without ventilation holes is formed on the flange part of the dish of the parabolic antenna and the outer edge of the radio wave reflecting surface inscribed in the 7th rank part, and a large number of ventilation holes are formed inside the reinforcement part by press punching or laser cutting. By integrally configuring the perforated radio wave reflecting surface portion, it is possible to form a vent-oriented dish that connects the reinforcing portion and the lattice-shaped radio wave reflecting surface portion.

As a result, there is no need to attach a reinforcing part as a separate part to the 7th rank part of the dish, and at the same time, by providing a large number of ventilation holes on the inner radio wave reflecting surface, the weight of the dish itself can be reduced, and a parabolic antenna can be installed. It reduces the weight to be supported when visiting and improves installation efficiency.

In addition, the weight of the mounting bracket can be reduced by reducing the ventilation resistance of the dish by having ventilation holes.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 17.

As shown in FIGS. 3 and 4, a flange reinforcement part 7 is provided on the outer periphery of the dish 5 of the parabolic antenna, and the radio wave reflecting surface 9 of the peripheral flange upright part 6 and the bent ridge line part 8 of the flange is provided.
There is no ventilation hole 2' near the side ridgeline, and there is a radio wave reflecting surface 9.
By providing as many ventilation holes 2'' as possible on the total reflection surface up to the outside of 80% of the radius of the parabolic antenna, the weight of the dish 25 itself of the parabolic antenna is reduced and the wind pressure applied to the dish 5 due to the ventilation holes 2'' is reduced. I can do it. Moreover, by using the flange upright part 6 forming the flange reinforcement part 7 or the vicinity of the flange part to attach the dish 5 to the mounting bracket 16 as shown in FIGS. 9 to 11, the dish 5 is Since the outer peripheral reinforcing flange part 7 of the dish 5 becomes a strength member that supports the wind pressure, the central part of the radio wave reflecting surface 9 is provided with many ventilation holes 2', so even if the surface strength of the central part of the dish 5 is weakened, it will not be affected by the wind pressure. The crosspiece 3'' can be made thinner to the extent that it does not deform due to external force.As mentioned above,
Since the flange reinforcing portion 7 has no ventilation holes and is strong, there is no need to attach an outer peripheral reinforcing member to the dish as a separate part, and no radial ribs are required. In addition, the perforated plate portion with many ventilation holes 2'' of the radio wave violation surface 9 and the inner portion of the ridgeline portion of the outer periphery flange reinforcement portion 7 without ventilation holes are integrally formed with the same curvature surface. The accuracy of the radio wave reflection surface is improved, and high-quality reflections 11 can be collected in the converter 20, thereby improving the receiving performance as a parabolic antenna.

Therefore, the outer diameter of the dish 5 of the parabolic antenna can be reduced accordingly, and the weight of the dish and mounting fittings can be further reduced.

Furthermore, by arranging the ventilation holes 2' in a straight line vertically and horizontally or vertically and horizontally, the crosspiece 3' between the ventilation holes 2'
Since they are arranged in a straight line and are continuous, the wind pressure and external force applied to the radio wave reflecting surface 9 mutually act as tensile force and compressive force. Therefore,
The force applied to the crosspiece 3' is transferred to the flange reinforcement part 7 on the outer periphery, and the crosspiece 3' is less likely to deform and absorb external force.
The AL wave offending surface 9 can be maintained with high precision. Further, when scooping a finished dish, the crosspiece 3' can evenly distribute the pulling force. Crosspiece 3 to lower ventilation resistance
It is necessary to make the ventilation hole 2" as thin as possible, and in that case, when the ventilation hole 2" is made square or rectangular, the ratio of the crosspiece 3" to the ventilation hole can be minimized, and the ventilation resistance and weight can be minimized. Rectangles are advantageous for mitigation.

In addition, the size of each ventilation hole 2'' should be such that it does not resonate when fishing, when the wavelength of the received radio wave is λ and the maximum width of the ventilation hole 2' is D, considering the reflection of the received AT wave. It is necessary to satisfy the following equation because the pore diameter needs to be a certain size.

Generally speaking, a vent hole of 1/4 inch or less is preferable for receiving 12 GHz satellite radio waves, and in the case of Japanese satellite broadcasting, the maximum width of the vent hole 2' for a receiving antenna is approximately 7. 9 mm or less. Further, in order to reduce ventilation resistance, it is advantageous for the ventilation hole 2' to be larger, and it is also good for reducing weight. It is also possible to provide the vent holes of the present invention in the dish of a plastic parabolic antenna with similar advantages.

As shown in Figures 16-4 and 17, a ring-shaped flange reinforcing part 47 is provided on the outer periphery, metal wires are arranged in advance in the vertical and horizontal directions inside the ring-shaped flange reinforcement part 47, and the intersecting parts of each are welded. The dish 44, which is formed by welding the radio wave reflecting surface together, can further reduce ventilation resistance by making the horizontal metal wire 41' and the vertical wire 42'' round wire rods.The flange reinforcement part 47 is a flange part. 45 and its ridgeline portion 46 are formed into an L-angle shape, it is possible to form a ring-shaped flange portion 47 with good strength at the outer periphery.

Figure 1 shows the dish shown in Figures 1 and 4 with ventilation holes drilled in it.The dish shown in Figures 1 and 4 is made by punching a metal plate inside a flat plate and then press-forming the plate. An example of a front view, Fig. 2 is a sectional view taken along the line X-X, and Figs. 51 and 6 are similar 7Jli machined boards, and the upper and lower parts are reinforced with lower parts to increase strength near the parts. The flat plate part 10 and the lower reinforcing flat plate part 11 are made wide in advance, and after press molding,
As shown in FIGS. 7 and 8, this is another embodiment in which the upper reinforcing section 12 and the lower mounting reinforcing section 13 are formed to have an outer circumferential width of 2096 or less of the radius of the radio wave reflecting surface. Further, FIG. 9 is a front view showing a state where the dish 5 is attached to a pillar 32 of a building, and the converter 2 is attached to the bracket 16.
It is shown in a state where it has been removed together with the support column 32. FIG. 10 is a side view thereof, and FIG. 11 is a perspective view of the bracket 16, showing one embodiment.

FIG. 12 shows that in order to increase the surface strength of the perforated plate portion of the dish 5, the ventilation holes are triangular and the crosspieces 34 are crossed at an angle of 60°. This is to increase the strength. However, the weight of dishes tends to increase.

Furthermore, Fig. 13 shows an example in which hexagonal ventilation holes 35 are bored at the outer periphery of the dish in order to reduce the unevenness of the outer periphery of the ventilation hole. This example shows an example in which a comparatively strong surface strength is maintained due to the uniformity, while also having the advantage of being able to provide ventilation holes with a large area.

The flat workpiece plate 39 in FIGS. 14 and 15 is the 16th
This is an example of a workpiece plate made integrally by face welding to form the dish 44 shown in the figure, and is an example in which a horizontal wire 41 and a vertical wire 42 are welded to a ring-shaped flat plate 40 to form a ventilation hole 43.

With a parabolic antenna like the one above, the dish of an offset type parabolic antenna with an outer diameter of 50 cm is 6 mm x 6 m.
As a result of providing 2.871 ventilation holes with a square hole of 2 m in width, the flange upright width is 16 mm, and the minimum distance from the ridgeline of the outer flange reinforcement part to the end of the ventilation hole is is 10 mm, and the weight i of the dish itself is 4596
was able to be reduced. In addition, the ventilation resistance in this case is that the remaining projected area including the raised portion of the flange of the dish is 5196 for a dish without ventilation holes, and the ventilation resistance can be reduced by about 4296 using the building wind pressure calculation method. Therefore, it is possible to create an antenna that is lighter in weight than conventional dishes and has better stability. In addition, unlike conventional dish dishes, there are ventilation holes that allow sufficient access to the roof, which helps prevent the parabolic surface from shifting or, in the worst case, being damaged due to the wind pressure that the parabolic surface receives during typhoons. or can be obtained.

According to the present invention, for the purpose of punching as many ventilation holes as possible, a temporary
Assuming that a square ventilation hole of 6 mm x 6 mm is drilled with a crosspiece width of 1 mm, the perforation area ratio, remaining area ratio, and received air ratio corresponding to each perforation range are as shown in the following table.

Received wind rate = remaining area & ratio X 1.6 Since the weight reduction rate and the received air force rate are the received air force after being reduced by the parabolic surface, the reduction rate is the remaining rate subtracted from 100.

IT reduction rate is approximately 4596 or more, wind blowing pressure reduction rate is 40%
In order to achieve the above, the perforation area must be at least 80% of the above.

〔Effect of the invention〕

According to the present invention, since the radio wave reflecting surface 9 has a large number of ventilation holes 2', the weight of the dish itself can be reduced, and the flange reinforcement part 7 without ventilation holes is formed in a foreign country, and the flange part 6 is It is possible to eliminate the need to provide a reinforcing member as a separate part on the outer edge of the dish since it is used for several lines of the dish.

Further, by providing a large number of ventilation holes 2', the blowing air pressure is reduced, so that the weight of the mounting bracket can be reduced.

Therefore, the installation work of the parabolic antenna becomes easier, and it becomes possible to install it on the roof, balcony handrail, window frame, etc., which improves the ease of installation.
sness

[Brief explanation of drawings]

FIG. 1 is a front view of a metal plate to be processed having ventilation holes 1 according to an embodiment of the present invention, and FIG. A'
IB1 side view, Figure 3 is a front view of the molded dish,
Fig. 4 is a sectional view taken along the line Y-Y in Fig. 3, Fig. 5 is a front view of a workpiece plate provided with a reinforcing flat plate portion according to another embodiment, and Fig. 6 is a sectional view taken along the line R-R in Fig. 5. 7 is a front view of the molded dish, FIG. 8 is a sectional view taken along line SS in FIG. 7, and FIG. 9 is a sectional view of the molded dish.
The figure is a front view of the assembled state, Figure 10 is a side view with a partial cross section of the dish surface of Figure 9, Figure 11 is a perspective view of the handle fitting, and Figure 12 is a view of the triangular ventilation hole. A partial view of the mesh surface, and FIG. 13 is a partial view of the narrow side of the hexagonal ventilation hole. Figure 14 is a front view of the workpiece plate made from a ring-shaped flat plate and metal wire, Figure 15
The figure is a sectional view taken along the line T-T in FIG. 14, FIG. 16 is a front view of the molded dish, and FIG. 17 is a sectional view taken along the line U-U in FIG. 16.
This is a + side view. DESCRIPTION OF SYMBOLS 1... Work plate, 2... Ventilation hole, 2'... Ventilation hole, 3... Crosspiece, 3'... Crosspiece, 4... Outer periphery reinforcement flat plate part, 4''... Outer periphery reinforcement part, 5... dish, 6...
・7 lunge upright part, 7... flange reinforcement part, tail...
Ridge line part, 9... Ripple projection surface, 10... Lower reinforced flat plate part, 11... Lower reinforced flat plate part, 12... Earth part reinforced part, 13... Lower reinforced part, 16... Several metal fittings, 20... Converter, 32... Pillar, 33...
Triangular ventilation hole, 34... crosspiece, 35... hexagonal ventilation hole,
36... Crosspiece, 37... Label, 38... Label, 39... Processed plate, 40... Ring-shaped flat plate, 41
...Horizontal wire, 41'...Rail material, 42...Vertical line, 42-...Vertical wire, 43...Vent hole, 43...Vent hole, 44...Dish, 45 ...flange part,
46...Ridge line part, 47...Flange reinforcement part. Radical 1 factor system 20 $50 $trfJ $70 11 Th9 diagram $lo factor 14 [i - ¥3ts (21

Claims (1)

[Claims] 1. In a dish for a parabolic antenna that is attached using an outer periphery flange part or the vicinity of the flange part, a flange reinforcement part provided on the outer periphery of the dish and a radius of 80% of the radio wave reflecting surface of the dish 1. A dish for a parabolic antenna, comprising: a ventilation hole extending beyond the flange reinforcement portion and extending to just before the bent ridgeline portion of the flange reinforcing portion. 2. The outer periphery flange reinforcement part of the dish and the perforated plate part having ventilation holes are integrally formed with the same curvature surface, and
2. The parabolic antenna dish according to claim 1, wherein the ventilation holes are arranged in parallel, and the crosspieces between the ventilation holes are all arranged in a straight line. 3. It has a ring-shaped flange reinforcement part on the outer periphery, and metal wires are arranged vertically and horizontally in advance on the inside of the flange reinforcement part, and a radio wave reflecting surface made of wire mesh is welded together by joining each intersection part. A dish for a parabolic antenna according to claim 1. 4. The crosspieces are crossed vertically and horizontally at right angles, and the crosspieces are arranged in a straight line to form a large number of square or rectangular ventilation holes, and the length of the long side of the ventilation holes is set so that the received radio waves are electrically A dish for a parabolic antenna according to claims 1 and 2, characterized in that the dish has a size smaller than a size that does not resonate.