JPH06196910A - Antenna system - Google Patents

Abstract

PURPOSE:To make it possible to easily add a snow melting function even in a state that an antenna system is set up operably by fixing a heat insulating cover and a blower including a heater in the cover by a fixing means fixed to the rear face of a concave face reflector. CONSTITUTION:The 1st part 20 is a device to be fixed to the concave face reflector 2 and is fixed by a fixing means 21 fixed to a vertical frame 6 for the reflector 2 and a fixing means fixed to a horizotal frame 7. A blower 22 and a blower 23 with a heater are fixed to the inside of the reflector 2. The 2nd part 24 is a device for an antenna horn 3 and the 3rd part 25 is a device for a subreflector 4. The 4th part 26 is a device for removing snow mounted on a supporting frame 16. Consequently snow mounted on a space to be a radio wave passage formed among the anetnna horn 3, the subreflector 4 and the reflector 2 can be removed and an effective space state can be secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device mainly for communication, which is installed on the ground or on a building.

There are antenna devices for transmission, reception, or both transmission and reception. In any case, the antenna device is composed of an antenna horn and a concave reflector electrically opposed to the antenna horn. , The beam pattern is fan-shaped or pencil-shaped. Since the antenna device is used for wireless communication, it is fixedly installed in order to communicate between points separated by a predetermined space, but it has a movable device to some extent and the direction is adjusted. Is normal. Recently, communication via communication satellites launched into outer space has also been used.

As the concave surface reflector, there are often used those obtained by processing a metal plate into a paraboloid of revolution and those obtained by molding CFRP. The relationship between the antenna horn and the concave reflector is configured as a so-called offset type because of its good manufacturability and handleability, and it has sufficient environmental resistance such as wind and rain resistance and wind and snow resistance to withstand the outdoor environment. It is provided.

Of these, those installed and operated in a snowy area must have a snow removing function. For this reason, measures are taken so that the antenna device is covered with a radome or snow is removed by a heater to prevent snow accumulation. The problem caused by snowfall is the concave surface of the concave reflector, the opening of the antenna horn, and the portion of the radio wave path between them. Therefore, it is necessary to take measures to prevent snow from accumulating in these parts.

[0005]

2. Description of the Related Art As a measure to prevent snow from accumulating with the above heater, a sheet-shaped pad heater is attached to the back surface of a concave reflector, and a heat insulating material is attached from above or the entire back surface is covered. A warm air heater was used to agitate the entire air inside.

A tape-shaped or cord-shaped rubber heater or a sheet-shaped heater is wound around the antenna horn and covered with a heat insulating material from above. In an antenna device in which a sub-reflector is arranged between a concave reflector and an antenna horn, a sheet-shaped pad heater is attached to the back surface of the sub-reflector for the sub-reflector as in the case of the concave reflector. I tried to attach a heat insulating cover from above.

A tape-shaped or cord-shaped rubber heater is wound around the supporting frame for supporting the sub-reflector and covered with a heat insulating material.

[0008]

In the method of attaching the heater as a countermeasure against the concave reflector, the temperature is not uniform and the reliability against the environment is not good. Even with the warm air heater, a uniform temperature condition cannot be obtained depending on the mounting condition. In any case, the product is shipped with it being installed at the factory. Therefore, when moving from a warm area to a snowfall area, it had to be sent to the factory for installation work.

As a countermeasure for the antenna horn, since the rubber heater must be attached while the antenna horn is removed, the attachment is difficult, and the inspection and repair at the time of failure are troublesome. If 90 ° is rotated around the axis to switch the polarization direction, there are inconveniences such as the joint of the heat insulating material and the power supply terminal of the heater being on the upper side and rainwater entering.

As a countermeasure against the sub-reflector, a uniform temperature condition cannot be obtained as in the case of the concave reflector, and it is difficult to attach a heater to the surroundings, so that the temperature of this portion becomes low, and the sub-reflector is also used. Since the shape of the is an ellipse, it was troublesome to manufacture a protective cover according to the shape.

There have been problems that a uniform temperature condition may not be obtained by taking measures against the frame for supporting the sub-reflector, and that the on-site installation work is troublesome and difficult, and the reliability against the environment is poor.

The present invention has been made in view of the above-mentioned various problems, and an object of the invention is to provide an antenna device which solves these problems.

[0013]

According to the first aspect of the invention, an antenna horn and a concave reflector electrically opposed to the antenna horn are provided. In the antenna device consisting of
It is an antenna device in which a heat insulating cover detachable by a mounting means provided on the back surface of the concave reflector and a blower including a heater are mounted in the cover.

According to the second aspect of the invention, in the antenna device comprising the antenna horn and the concave reflector electrically opposed to the antenna horn, the heat transfer member having the heater is detachably attached to the outer periphery of the antenna horn. It is an antenna device.

According to the third aspect of the invention, an offset type antenna comprising an antenna horn, a concave reflector electrically opposed to the antenna horn, and a sub-reflector arranged between the antenna horn and the concave reflector. In the apparatus, the antenna device has a cover attached to the back surface of the sub-reflector by a screw for attaching the sub-reflector to a support frame for supporting the sub-reflector, and a heater attached to the upper and lower portions of the back surface of the sub-reflector in the cover.

According to the fourth aspect of the invention, an offset type antenna comprising an antenna horn, a concave reflector electrically opposed to the antenna horn, and a sub-reflector arranged between the antenna horn and the concave reflector. In the device, an antenna device in which a cover assembly having a heater is detachably attached to a mounting screw for mounting the sub-reflector on a support frame for supporting the sub-reflector.

The above problems are respectively achieved by the respective inventions, and by combining them, more reliable and preferable results can be obtained.

[0018]

According to the aspect of each constituent means of the antenna device of the present invention, according to the first aspect of the present invention, the attachment means is provided on the back surface of the concave reflector, and the attachment means includes the heat insulating cover and the heater in the cover. By installing
The snow melting function can be easily imparted even in the operatively installed state.

According to the second aspect of the present invention, the heat transfer member having the heater is attached to the outer periphery of the antenna horn easily and easily, and detachably, so that the antenna horn can be attached even if it is installed operably, and exchanged It is possible to add an easy snow melting function.

According to the third aspect of the invention, a cover for covering the back surface of the sub-reflector is provided at a screw portion for mounting the sub-reflector on a supporting frame for supporting the sub-reflector, and a heater is provided in the cover so as to contact the upper and lower portions of the back surface of the sub-reflector. This makes it possible to directly heat the upper and lower parts of the sub-reflector and indirectly heat the air inside the cover to impart a snow melting function.

According to the fourth invention, the cover assembly is attached to the screw portion for attaching the subreflector on the frame for supporting the subreflector, so that the heater heats along the frame, so that the heater is effectively moved onto the frame. It is possible to add a function of removing snowmelt from the snow.

Each of the above inventions can be applied to a necessary part, but by combining them, the best operation and effect are exhibited.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The antenna device of the present invention will be described in detail below with reference to the drawings in each specific embodiment.

FIG. 1 is a side view of an antenna device to which the present invention is applied, and FIG. 2 is a front view thereof. In the figure, this antenna device is an offset type Gregorian antenna device. This antenna device 1 is composed of a concave reflector 2 and an antenna horn 3 which are rotary parabolic mirrors, a sub-reflector 4 which is a spheroidal mirror which is arranged between the concave reflector 2 and the antenna horn 3, and an antenna horn. 3 and the outdoor unit 5 of the transmitter / receiver connected thereto. The diameter of the concave reflector 2 is about 2 mφ.

The concave reflector 2 is made of aluminum plate material and is integrally formed by press working. The rear surface is supported by the two vertical frames 6 and the one horizontal frame 7, and has a large rigidity and strength. There is. The intersecting portion of the vertical frame 6 and the horizontal frame 7 is integrally welded, further connected to the rib plate 8 and supported by a shaft 9 which can be tilted in the vertical direction.

The shaft 9 is attached to the top of the column 10 at the end of a rotating frame 11 which can rotate in the horizontal direction.
The rotating frame 11 is rotatable in the horizontal direction around the top of the column 10 and can be fixed at any position.

The rear surface of the rotary frame 11 extends downward and is fixed to the support column 10 with U bolts 12 to stabilize the fixation. This rotating frame 1
The rear side of the screw shaft 13 attached to the lower part of the shaft 9 at a position lower than the shaft 9 is engaged with the rear portion of the vertical frame 6 and is sandwiched by the two front and rear nuts 14.

By rotating and adjusting the two nuts 14 in the forward and backward directions, the screw shaft 13 is moved forward and backward, and the concave reflector 2 can be slightly tilted about the shaft 9 in the vertical direction. The position can be fixed by tightening both nuts 14 at a predetermined position.

The lower part of the column 10 is mounted and fixed on a foundation or a building 15 constructed on the ground. A support frame 16 extending forward is attached below the front surface of the concave reflector 2, and the front end is supported and fixed by two support stays 17 from the left and right surfaces of the concave reflector 2. Support frame 1
Reference numeral 6 is parallel, and the front end and the intermediate portion are connected and integrated by members. The sub-reflector 4, the antenna horn 3, and the front side of the outdoor unit 5 of the transmitter / receiver are attached between them. The rear side of the outdoor unit 5 has a vertical frame 6
It is attached to and supported by a mounting bracket 18 from between.

The shield plates 19 attached to both sides of the support frame 16 suppress the emission of unnecessary radio waves from the antenna horn 3. The front end of the shield plate 19 supports and fixes the sub-reflector 4. ing. Therefore, the shielding plate 19 is structurally a part of the support frame 16.

The antenna device 1 is of a general-purpose type having the above-described configuration and not having a snow melting function for directly removing snowfall. Therefore, it will be installed in a warm zone where there is no snowfall.

The antenna device 1 having a snow melting function is shown in the side view of FIG. FIG. 3 shows a part of the concave reflector 2 in cross section and partially overlapped. This snow melting measure is roughly divided into four parts.
The first part is the device 20 for the concave reflector 2, which is attached by means of attachment means 21 attached to the vertical frame 6 of the concave reflector 2 and attachment means attached to the lateral frame 7.

A blower 22 is attached to the upper part and a blower 23 with a heater is attached to the lower part, and the inside is thermally shielded from the outside. As a result, snow accretion on the concave surface of the concave reflector 2 is removed.

The second part is the device 2 to the antenna horn 3.
4, the snowfall on the front opening of the antenna horn is removed. The third part is a device 25 for removing snowfall on the sub-reflector 4, which is attached to the back surface of the sub-reflector 4 to keep the reflecting surface of the sub-reflector 4 in good condition.

The fourth part is a device 26 for removing snowfall on the support frame 16, by means of which a radio wave path between the antenna horn 3 and the sub-reflector 4 and the concave reflector 2 is introduced. Snowfall is removed and good spatial condition is secured.

Each part will be sequentially described in detail below with reference to the drawings. Referring to FIG. 4 for the first invention, a rear view of only the concave reflector 2 is shown. Due to the scale, details are omitted. This also applies to the following figures. First, the horizontal frame 7 of the concave reflector 2
Attachment means 27 are attached to the left and right portions of the. This attachment means 27 is a side view of FIG.
As shown in the plan view of FIG. 2B, there is a gap between the mirror surface plate 28 and the horizontal frame 7 having a channel cross section, and the flat plate 29 is inserted between the mirror frame plate 28 and the hat-shaped metal fitting 3 from the back side.
0 is tightened with the application screw 31 and clamped.

Since screw holes are formed in the upper and lower surfaces of the hat-shaped metal fitting 30, one leg of the L-shaped metal fitting 32 is attached thereto with the screw 33. The other leg of the L-shaped metal fitting 32 has a threaded metal fitting 3 in which a mounting screw hole 34 is formed.
5 is fixed with screws 36.

As can be seen clearly from FIG. 5B, the mounting means 27 are mounted at positions separated from each other in the left-right direction of the horizontal frame 7, so that the concave curved surface of the mirror plate 28 of the concave reflector 2 is considerably inclined. It is in a state. Therefore, the L-shaped fitting 32 is not attached at a right angle to the hat-shaped fitting 30, but is attached in an inclined state. This means that all the screw fittings 35 have the same surface and the axes of the screw holes 34 are set to be parallel to each other, and the left and right are symmetrically arranged.

Therefore, the insertion hole of the screw 33 is formed as a long hole so that the inclination can be adjusted and the heights can be made uniform. FIG. 5 (b) is shown in the tilted state as described above, but FIG. 5 (a) is shown in the right angled state for ease of understanding.

Next, the attaching means 21 attached to the vertical frame 6 will be described with reference to the plan view of FIG. 6. Similarly, between the mirror surface plate 28 and the vertical frame 6 having an H-shaped cross section, There is a gap, and the flat plate 40 is inserted between the gaps, and the hat-shaped metal fitting 41 is tightened and fixed by the application screw 42 from the back side.

Since both sides of the hat-shaped metal fitting 41 are formed with screw holes, one leg of the L-shaped metal fitting 43 is attached thereto with screws 44. A screw fitting 46 having a mounting screw hole 45 is attached to the other leg of the L-shaped fitting 43 with a screw 47.

Since the mounting means 21 is also mounted at vertically spaced positions on the vertical frame 6, the mounting means 21 is inclined with respect to the mirror plate 28 like the former mounting means 27. Therefore, the hat-shaped metal fitting 41 and the L-shape. Metal fittings 43
In the same manner, the screw fittings 46 are set to be in the same plane and the axes of the screw holes 45 are set to be parallel to each other in an appropriately inclined state between them.

The L-shaped metal fitting 43 is different from the hat-shaped metal fitting 41.
The installation direction of is up, down, left and right, and is installed in symmetrical positions. Screw fitting 3 attached as above
The positions of 5, 46 are set by using a jig (not shown).

FIG. 7 shows a state in which the cover 50 covering the back surface of the concave reflector 2 is viewed from the back surface side. This cover 50
Is formed so as to be vertically separable by a dividing line 51 in the central portion,
Although not shown, it has an overlapping part and is connected by a screw. Referring to FIG. 3 together, the periphery is a curved surface having a space so as to cover the concave reflector 2, but the rectangular portion 52 of the central portion is formed into a flat surface.

The mounting seat portions 53, 5 are arranged so as to coincide with the mounting means 21, 27 in the vertical and horizontal directions of the curved surface portion.
4 are formed on a flat surface, and screw insertion holes are formed in each of them.

In the central portion 52, there are formed deformation holes 55 through which the rib plate 8 and the screw shaft 13 of FIG.
Around the deformation hole 55, a fastening tape (product name: Magic fastener) 57 having a predetermined width is attached.

A rectangular hole 58 for mounting a blower and a flat frame 59 are formed below the central portion 52, and a plurality of screw holes (not shown) are formed in the flat frame 59. Further, an auxiliary cover 60 for reversing and sealing the outdoor unit 5 of the transmitting and receiving device shown in FIG.

This cover 50 has a central divided portion 51.
Can be separated into upper and lower parts, and can be joined so as to be fitted to the back surface side of the concave reflector 2 from above and below. The screws are not shown in the drawing, and the screws are connected again. At this time, the auxiliary cover 60 is removed.

The mounting seat portions 53, 54 contact the surfaces of the screw fittings 35, 46 of the mounting means 21, 27 of FIG.
Since the screw holes 34 and 45 are seen through the screw insertion hole, the screws are attached and fixed there. In addition, the removed auxiliary cover 60 is attached.

Since the deformation hole 55 of the cover 50 is in an open state, the deformation hole 55 is closed by using a closing plate 65 shown in FIG. The closing plate 65 is mainly composed of three kinds of members, and is made of a non-woven cloth made of synthetic resin such as polyester which is waterproof and durable and has weather resistance.

The first member 66 closes the central portion of the deforming hole 55 and has a rectangular shape that is long in the left and right. As shown in FIG. 9, a fastening tape 67 is attached to the back surface in parallel vertically. Has been. Further, it has projections at the top and bottom of the center, and fasteners 68 are provided there.

The second member 69 is arranged symmetrically to the left and right of the first member 66 in FIG. 8 to cover the portion of the rib plate 8 and has a vertically long rectangular shape. As shown in FIG. 10, a fastening tape 70 is formed on the back surface so as to correspond to the periphery of the deformation hole 55.
Is attached in a frame shape, and a fastener 71 is provided in a vertically extending portion. A cutout 72 is formed on one side, and a tubular portion 73 and a string 74 around the tubular portion 73 are formed in the back direction.
Is drawn out at the end of the notch 72. A hole 75 into which the rib plate 8 is inserted is formed in the central portion of the cylindrical portion 7.
It is formed corresponding to 3.

The third member 76 is symmetrically arranged on both lower sides of the first member 66 in FIG. 8 and covers the portion of the screw shaft 13, and has a rectangular shape extending downward from the first member 66. As shown in FIG. 11, a fastening tape 77 is attached to the back surface in a frame shape, has a notch 78 at the lower end and projections on the left and right, and a fastener 79 is provided there. A tubular portion 80 and a string 81 surrounding the tubular portion 80 in the rear direction are led out at their ends at the notches 78. A hole 82 into which the screw shaft 13 is inserted is formed corresponding to the tubular portion 80.

The above-mentioned members 66, 69 and 76 are provided with deformation holes 55.
The first member 66 is pressed against the central portion of the
The fasteners 7, 67 are engaged and the fasteners 56, 68 are engaged to fix the position.

Then, the notch 72 of the second member 69 is opened, and the rib plate 8 is held so as to be housed in the tubular portion 73.
The fastening tape 70 is pressed against the fastening tape 57 around the deformation hole 55 to be fastened, and the fasteners 71 and 56 are attached.
And are engaged to fix the position. The string 74 is tightened to close the opening of the tubular portion 73 and closed in a purse-like shape, and the strings 74 are held together.

The notch 78 of the third member 76 is inserted into the tubular portion 80 through the screw shaft 13, and the fastening tape 77 is pressed against the fastening tape 57 around the deformation hole 55 and fastened. Engage 79 and 56 to lock in position. The string 81 is tightened to close the opening of the tubular portion 80 and closed like a purse string, and the strings 81 are bound together.

Although the deformation hole 55 is closed as described above, a gap may be formed in the adjacent portion of each member 66, 69, 76, and therefore, although not shown, a fastening tape is further provided in this portion. It is preferable to provide another blocking plate by applying.

As shown in the partial cross-sectional view of FIG. 12A, the periphery of the concave reflector 2 in FIG. 3 and the back surface and the periphery of the cover 50 in FIG. By fitting and adhering the groove of the flexible rubber piece 85 to the tip end portion of 60, the tip fin 86 of the rubber piece 85 is prevented from being pressed into contact with the periphery 87 of the concave reflector 2 and entering the inside of rainwater. To be done. In addition, the circulation of internal air and external air is also lost. Regarding the portion of the auxiliary cover 60, the tip fin 86 of the rubber piece 85 is pressed against the back surface of the concave reflector 2 to perform the same function. These parts are also shown in FIG.

The cover 50 and the auxiliary cover 60 shown in FIG. 7 are joined by a stopper 61. This state is shown in FIG.
2, the cover 50 as shown in the partial sectional view of FIG.
A rubber packing 92 is interposed between the rising portion 90 of the auxiliary cover 60 and the rising portion 91 of the auxiliary cover 60, and these are screwed from one side of the U-shaped stopper plate 61 with a screw 93.
Are joined by being tightened by. Reference numeral 94 indicates a metal fitting which locally prevents the screw tip from biting. A plurality of the stoppers 61 are arranged in the connecting portion at appropriate intervals.

The portion of the rectangular hole 58 for mounting the blower is covered with the blower mounting plate 95 shown in FIG. A blower 23 with a heater, which is composed of a heater 96 and a blower 97, is attached downward at the center of the blower mounting plate 95, and a rubber packing 98 and a mounting hole 99 are provided around the blower 23.

The rubber packing 98 is aligned with the portion of the flat frame 59 of the cover 50, and a screw is screwed into the screw hole (not shown) of the portion of the flat frame 59 through the mounting hole 99 to fix the screw. The operation of the above configuration will be described with reference to FIG.
Hot air is circulated like 0, 101. The warm air blown downward hits the part of the auxiliary cover 60, spreads to both outer sides, reaches the upper side along the periphery of the cover 50, is sucked by the blower 23 with a heater, and is circulated again as warm air.

Since the upper blower 22 is arranged so as to blow upward, the air is circulated as indicated by arrows 102 and 103. The air blown upwards reaches the upper end, wraps around both outsides of the cover 50, reaches the lower side, is sucked by the blower 22, and is blown upward again to be circulated.

What is important here is that horizontal partitions 104 are provided at the upper and lower central portions of the cover 50, which is not mentioned in the above description. Therefore, as shown in the figure, the warm air of the blower with a heater 23 circulates in the lower half, and the air from the upper blower 22 circulates in the upper half. Since the warm air tends to rise upward because the warm air tends to rise upward, it is inevitable that the temperature above will be higher than below and the snow melting effect below will decrease.
This is to prevent it from happening.

As shown in FIG. 3, when the antenna device 1 is set obliquely upward so that the direction of the antenna beam is directed to the satellite direction in outer space, the attitude of the concave reflector 2 becomes nearly vertical. become. The upper concave surface of the concave reflector 2 faces downward where snow is hard to accumulate, and the lower concave surface faces upward where snow is easily accumulated. Therefore, it is necessary to predominantly heat the lower surface.

However, if the upper half is not heated at all, there is a risk of snow accretion if a portion below zero degree occurs, so an appropriate space is formed in the partition 104, and at least the minimum required warm air is indicated by the arrow. As shown by reference numeral 105, it is configured so as to flow into the upper half portion. The partition 104 is formed in this way.
However, since most of the warm air heats the lower half, it does not require a large capacity heater 96 and is efficient and power saving.

As described above, according to the first aspect of the present invention, the antenna device 1 shown in FIG. 1 is provided with a snow melting function without any processing so that the antenna device 1 shown in FIG. You can For this reason, the antenna device of FIG. 1 can be manufactured irrespective of the weather conditions in the installation zone, and can be installed locally according to local requirements.

When the cover 50 is made of an aluminum plate, a heat insulating layer such as urethane foam is attached to the inner surface of the cover 50 so that the warm air inside is not radiated wastefully through the cover. Even in the case of a resin molded product, it is more preferable if similar measures are taken.

The second invention will be described below with reference to FIGS. FIG. 15A shows a plan view of the antenna horn 3 shown in FIG. 1, particularly the horn portion.

The left side in the figure is the horn opening 110, and the right side is the portion 1 connected and connected to the outdoor unit 5 of the transceiver.
Eleven. The intermediate portion 112 is supported and fixed by a support fitting 113 from the intermediate connecting frame of the support frame 16. Between the intermediate portion 112 and the opening 110, a conical portion 114 is formed both inside and outside.
The antenna horn 3 is made of a metal having a relatively good thermal conductivity such as an aluminum material or a copper alloy.

FIG. 15B is a plan view showing a state in which the snow melting device 24 as the second portion is attached to the conical portion 114 of the antenna horn 3. This snow melting device 2
4 is a plan view in FIG. 16 (a), and a front view in a state of being vertically separated is shown in FIG. 16 (b). Figure 16 (a)
Referring to (b), a pair of upper and lower heat transfer members 116, 117
Is a cone 118 having a circular outer shape and an inner shape matching the conical portion 114. A U-shaped groove 119 is formed on both sides, and a space d is provided between the common center line c shown in FIG.

This means that when the center lines c are made to coincide with each other, the heat transfer members 116 and 117 have a perfect circular shape, and the divided surface 12
There will be a space of 2d between 0 and 121.
It is nothing but the separated by cutting with a cutter having a width of 2d after cutting into an integral ring shape.

Both split surfaces 120 of the upper heat transfer member 116
A screw hole 123 is formed in the lower heat transfer member 117, and a screw seat 124 having a screw insertion hole is formed in the lower heat transfer member 117.

A U-shaped pipe heater (known as a sheath heater) 125 is press-fitted into the concave groove 119 of the upper heat transfer member 116 from above, and the cover 1 is inserted from above.
26 is covered and attached and fixed by a screw 127. These heat transfer members 116 and 117, the cover 126
Is preferably an aluminum material having a good thermal conductivity, but the cover 126 may be made of a heat-defective conductor such as stainless steel, which has the advantage that heat is not easily released to the outside.

A sectional view taken along the line aa of FIG. 15 is shown in FIG. This figure shows both heat transfer members 116 and 117.
Are assembled and fastened together by screws 128. A conical shape 118 corresponding to the conical part 114 of the antenna horn 3 is closely attached, but it is well shown that the existence of the gap 2d ensures a sufficient tightened state. It seems that this tightening causes slipping in the small-diameter axial direction of the conical portion 114, but the middle portion 1 of the antenna horn 3
This is not the case because the end face of 12 is abutted.

By energizing the terminal 129 of the pipe heater 125, the heater 125 generates heat. This heat is transferred to the heat transfer member 116, and the conical portion 1 of the antenna horn 3 is transferred.
Heat 14 to raise overall temperature. As a result, snowfall is removed without melting in the opening 110. The heat transfer member 117 on the lower side increases the heat capacity of the entire portion and provides a heat retaining effect.

The partial cross-sectional view of FIG. 17B shows that the pipe heater 125 is pressed into the concave groove 119 by the cover 126, but the peripheral surface of the heat transfer member 116 and the cover 126. A reliable tightened state is obtained by the gap e between them.

Further, the cover 126 extends downward by a sufficient length and serves to protect the pipe heater 125.
What is important here is that it is not necessary to snow-cover the opening 110 of the antenna horn 3, so it is sufficient to protect the opening 110 by melting snow.
It is also possible to extend the tip of the cover 126 to form the eaves portion 130 as shown in the side view of FIG. In addition to preventing direct snowfall from adhering to the portion of the opening 110 as long as it does not affect the path of the radio wave, snow melting by the heat of the eaves portion 130 is performed.

FIG. 19 shows a different embodiment. FIG. 7A is a plan view of the antenna horn in which the snow melting device 24 is shown in a cross section, and FIG. 9B is a front view of the snow melting device 24 taken along a heat pipe section.

The main construction of this embodiment is almost the same as that of the previous embodiment, but the U-shaped concave groove 119 has the heat transfer members 116 and 117.
The U-shaped pipe heater 125, which is formed on the inner peripheral surface of the conical shape 118, is press-fitted from the inner surface. With such a configuration, the cover 126 is unnecessary.

In addition, it is possible to provide a plurality of pipe heaters depending on the size of the antenna horn and environmental temperature conditions. Since the mounting portion of the pipe heater is a U-shaped groove, the contact heat transfer between the pipe heater 125 and the concave groove 119 is very effectively performed.

According to the present invention, it is possible to easily attach the respective snowmelts 24 even if they are installed, without performing any processing on the antenna horn itself, and it is possible to perform maintenance inspection, replacement, and removal. It can be done easily.

FIG. 20 shows an embodiment of the third invention.
22 to 23, description will be given below. This invention includes a third portion 25 attached to the subreflector 4 in FIG.
Is. The sub-reflector 4 is attached to the tip of the shield plate 19 attached to the support frame 16 as described in the description with reference to FIG.

According to the present invention, as shown in the horizontal schematic sectional view of FIG. 20A and the front view of FIG. And a flat portion 136. As is apparent from the front view, the concave surface 135 has a short diameter in the horizontal direction and a long diameter in the vertical direction. Further, since the outer shape is circular, the left and right flat surface portions 136 are widely secured, and the mounting holes 137 for the shield plate 19 are secured in this portion.

A circular cover 138 is attached to the back surface of the sub-reflector 4 so as to be fitted thereto.
A pipe heater (also known as a sheathed heater) 139 formed in a circular shape is attached to the inside of 38.

Since the pipe heater 139 is formed in a circular shape, a state in which it is not in contact with the horizontal minor axis portion of the concave surface 135 but floats in the middle is shown in FIG. Figure 21
(A) is shown in a vertical sectional view, in which the circular pipe heater 139 is shown in partial contact with the back surface of the concave surface 135. That is, the upper and lower portions of the sub-reflector 4 and the pipe heater 139 are in contact with each other, so that the upper and lower portions directly receive the heat generated by the pipe heater 139.

In FIG. 21B, the pipe heater 139 is shown.
Is shown attached to the cover 138.
Screw the metal holder 140 to the pipe heater 139.
41, and the holding metal fitting 140 is attached and fixed to the cover 138 with a screw 142. This mounting structure is provided at a plurality of important points. Cover 138
It seems that the periphery of the sub-reflector and the back surface of the sub-reflector 4 are fitted in a circular portion, and a rubber packing 143 is fitted in the abutting portion to be in a hermetically sealed state.

In FIG. 1, the mounting holes 137 formed in the plane portion 136 are screwed and fixed directly to the shield plate 19 as shown in FIG. 22 (a), but shown in FIG. 21 (c). Cover 138 and flat portion 13
6, a pipe 144 is interposed between the inner surfaces facing each other, and a long screw 145 is inserted therein instead of the original short screw, and is fixed to the end of the shield plate 19 by screwing as shown in FIG. Then, the sub-reflector 4 can be attached without any processing such as processing.

The heat generated by the energization of the pipe heater 139 directly raises the temperature above and below the concave surface 135, so the snow is effectively removed according to the adhesion of snow. In particular, the effect of snow melting is great because the temperature of the lower concave surface where snow is likely to occur is high. The part floating in the middle heats the air inside the space to cause convection, warming the whole and melting snow.

Since the flow of internal air by convection raises the temperature of the upper part, it warms the upper part of the cover 138 where snow is easily accumulated, so that the snow is removed and the protrusion of the snow on the front surface of the upper part of the sub-reflector 4 is eliminated.

The circular outer shape of the sub-reflector 4 has the advantage that the cover 138 can be circular and the manufacturing is good, in addition to the ease of mounting. An embodiment of the fourth invention will be described below with reference to FIG. 23 is a side view of the shield plate 19, the antenna horn 3, and the subreflector 4 with respect to the support frame 16 corresponding to FIG. 1, and FIG. 24 is a plan view thereof. The right end of the support frame 16 is attached and fixed to the lower end surface of the concave reflector 2. The sub-reflector 4 is not shown in FIG.

The support frame 16 is formed by welding the two left and right frames 150 of the aluminum pipe and the front and middle connecting frames 151, 152, which are integrated, and the supporting metal fittings 113 are attached to the intermediate connecting frame 152. The antenna horn 3 is supported by.

The front end of the outdoor unit 5 (not shown in FIG. 23) of the transmitter / receiver is supported and fixed by a mounting member 153 that approaches the intermediate connecting frame 152 and straddles the frame 150.

A U-shaped metal fitting 154 is used for the mounting portion of the support frame 16 to the concave reflector 2 and is hingedly mounted by a shaft 155, and the tip is mounted and supported by a support stay 17 to form a truss structure. Thus, the support position is fixedly fixed.

The shield plate 19 is fixedly mounted on the frame 150 by three screws 157 by bending the upper end 156. The sub-reflector 4 is attached and fixed by two right and left screws 159 by the inclined bending 158 of the front end of the shield plate 19. These structural members are made of aluminum with the exception of screws.

The related structure of the support frame 16 is as described above. Next, the snow melting apparatus which is the fourth portion 26 of the support frame 16 will be described mainly with reference to the plan view of FIG. 25 and the side view of FIG.

The snow melting device 26 covers the support frame 16 with an aluminum cover 160 and a heater 1.
61 and 61. That is, the frame 15
0 is composed of a first cover 162, a second cover 163 that covers the tip connection frame 151, and a third cover 164 that covers the middle connection frame 152, both of which are formed in a roof shape and integrated. Has been done.

The heaters 161 are two U-shaped pipe heaters (known as sheathed heaters) 165 and 166.
And the pipe heater 165 includes the first cover 162.
And is attached along the lower surface of the second cover 163. The pipe heater 166 is attached along the lower surfaces of the first cover 162 and the third cover 164.

The snow melting device 26 of the cover assembly consisting of the cover 160 and the heater 161 has two screws 157 on the left and right of the three screws 157 for attaching the shield plate 19 to the support frame 16 (positions are fixed). (One is left for this purpose) is attached and fixed to the support frame 16.

A cross-sectional view of each portion will be described with reference to FIG. 27. FIG. 27A is a cross-sectional view of the portion of the second cover 163, which covers the upper end of the connecting arm 151 and the pipe heater 165 is a metal fitting. Second by means of 167 and screws 168
The cover 163 is attached and fixed so as to be in close contact with the cover 163.

According to FIG. 10B, the wide first cover 16 is provided.
2 securely covers the top of the frame 150, and the pipe heater 1
Metal fitting 167 and screw 168 so that 65 and 166 are parallel to each other.
And are closely attached to and fixed to the first cover 162.

According to FIG. 10C, the wider third cover 164 is provided with the intermediate connecting frame 152 and the mounting bracket 1.
53 is covered and the heater 166 is attached to the metal fitting 167 and the screw 16
It is attached and fixed so as to be in close contact with the third cover 164.

On the other hand, the snow melting device 2 which is a cover assembly.
As shown in FIG. 28A in FIG. 28, pipe spacers 169 of a predetermined length are attached and fixed to the first cover 162 at two positions on the left and right at positions corresponding to the screws 157 of the frame 16. There is.

The four screws 157 for attaching and fixing the shield plate 19 to the frame 150 are long screws 1 as shown in the figure.
The tip of the screw 170 projects above the bend 156 by screwing it into the nut fitting 171 attached to the bend 156 as 70 and attaching and fixing the shield plate 19.

Therefore, the pipe spacer 169 of the snow melting device 26, which is a cover assembly, is fitted into the projecting portion of the screw 170 from above, a washer is fitted to the tip of the projecting screw 170, and the nut 172 is screwed into the snow melting device 26. It is mounted and fixed on the support frame 16.

This state is the state shown in FIG. 3, which is shown in detail in FIG. In order to prevent the parts other than the part attached with screws 170 from vibrating due to wind,
As shown in FIG. 2B, for example, in the case of the drawing, a spacer 173 having a predetermined length is integrally attached to the first cover 162, and its lower end is brought into contact with the upper surface of the frame 150, so that vibration or the like occurs. Problems are prevented. This is a great effect without being fixed by providing it at a plurality of important points.

In the embodiment of FIG. 25, the pipe heater 165,
As shown in FIG. 29A, it is possible to significantly reduce the amount of snowfall caused by snowfall on the concave reflector 2 side as shown in FIG. 29A. It is also possible to form a single pipe heater 175 as shown in) so as to pass through the intermediate connecting frame portion, and heat the pipe 150 with the heat from the pipe heater 175 to heat the portion of the frame 150 where the pipe heater does not pass And can save the parallel use of pipe heaters.

It is also possible to make the pipe heater 165 into a simple shape and transfer the heat from both sides to the intermediate connecting frame 152 portion by the L-shaped heat pipe 177 as shown in FIG. According to FIGS. (B) and (c), it is suitable to be applied to an area with a small amount of snowfall.

As described above, also in the present invention, the screw 157 can be easily attached without replacing it by simply replacing the screw 157 with the long screw 170.

According to the present invention, since snow is not left on the support frame 16, it is preferable that the passage of radio waves between the antenna horn 3 and the sub-reflector 4 and the concave reflector 2 is not obstructed by snow. Secure space condition is secured.

As described above, the present invention can apply the most suitable invention modes according to the amount of snowfall, and if all are applied, the best condition can be obtained, but it is essential that all are applied. However, it can be appropriately selected and applied according to the situation. Moreover,
The first portion 20 does not need to be applied to the rear surface of the concave reflector 2, and covers the area with a small amount of snowfall or the area with a relatively high temperature without the upper half portion. Therefore, the present invention includes the fact that it is sufficient to melt the lower half of the snow which is liable to accumulate snow.

[0111]

As described above in detail, in each of the inventions of the present invention, the snow melting function can be imparted to the original antenna device without any processing, and the antenna device can be attached and detached. It is something.

Moreover, it is extremely useful in that it can be applied even at an installation site. According to the first aspect of the present invention, the temperature distribution in the central portion and the peripheral portion becomes uniform, and the effect of mainly eliminating the easily accumulated snow in the lower portion of the concave surface is large, and it can be applied to the lower half for areas with a small amount of snowfall. It is a thing.

According to the second aspect of the invention, even if the antenna horn is rotated around the axis by changing the polarization direction, it is easy to rotate the snow melting device accordingly, so that an optimum posture can be applied. The eaves can also be applied upon request.

According to the third aspect of the present invention, it is possible to positively mainly melt the snow-prone portion, so that the application and the effect thereof are extremely remarkable. According to the fourth aspect of the invention, since an ideal passage space for radio waves is secured, the possibility of obstacles caused by snow is eliminated.

Since the invention can be applied individually, it is possible to individually adjust the power supply for heating, so that it is possible to set each part to an optimum state according to the situation of each part. Is.

[Brief description of drawings]

FIG. 1 is a side view of an antenna device to which the present invention is applied.

2 is a front view of FIG.

FIG. 3 is a side view of the antenna device of the present invention.

[Fig. 4] Rear surface of concave reflector only

FIG. 5 Means for attaching to horizontal frame

FIG. 6 means for attaching to a vertical frame

FIG. 7 is a view of the cover from the back.

FIG. 8 is a rear view of the closing plate.

FIG. 9 is a back view of the first member.

FIG. 10 is a rear view and a side view of the second member.

FIG. 11 is a rear view and a side view of the third member.

FIG. 12 is a partial cross-sectional view of a combined portion of a concave reflector and a cover and an auxiliary cover.

[Fig. 13] Blower mounting plate

FIG. 14 is an explanatory view of the operation of the first part.

FIG. 15 is a plan view of an antenna horn portion.

FIG. 16 is a plan view of the snow melting device and a front view of the separated state.

17 is a sectional view and a partial sectional view taken along the line aa of FIG.

FIG. 18 is a side view showing a state where a cover is provided with an eaves portion.

FIG. 19 is a plan view, a front view, and a sectional view of a different embodiment.

FIG. 20: One embodiment of the third invention

FIG. 21 is a cross-sectional view of each part of FIG.

FIG. 22 is a comparative view of the mounting state.

FIG. 23 is a side view of components related to the support frame.

FIG. 24 is a plan view of FIG.

FIG. 25 is a plan view of a snow melting device (fourth portion)

FIG. 26 is a side view showing a state in which FIG. 25 is attached to FIG. 23.

FIG. 27 is a sectional view of each part

FIG. 28 is a sectional view of each part.

FIG. 29 is a heater arrangement example.

[Explanation of symbols]

 1 Antenna Device 2 Concave Reflector 3 Antenna Horn 4 Sub-Reflector 5 Outdoor Unit 6 Vertical Frame 7 Horizontal Frame 8 Rib Plate 13 Screw Shaft 16 Support Frame 17 Support Stay 19 Shield Plate 20 First Part 21 Mounting Means 22 Blower 23 Heater Blower with blower 24 Second part 25 Third part 26 Fourth part 27 Mounting means 28 Mirror surface plate 34,45 Screw hole for mounting 35,46 Screw fitting 50 Cover 51 Dividing line 52 Square central part 53,54 Mounting seat Part 55 Deformation hole 57 Locking tape 58 Rectangular hole 60 Auxiliary cover 61 Stopper 65 Closing plate 66 First member 69 Second member 76 Third member 85 Rubber piece 95 Blower mounting plate 104 Partition 110 Opening 114 Conical Part 116,117 Heat transfer member 118 Cone 119 Recessed groove 1 20,121 Divided surface 125 Pipe heater 126 Cover 130 Eaves portion 135 Concave surface 137 Mounting hole 136 Flat surface portion 138 Cover 139 Pipe heater 144 Pipe 145 Screw 150 frame 151 Frame at the tip of connecting frame 152 Intermediate connecting frame 153 Mounting bracket 156,158 Bending 160 Cover 161 Heater 162 First Cover 163 Second Cover 164 Third Cover 165,166 Pipe Heater 169 Pipe Spacer 170 Long Screw 173 Spacer 175 Pipe Heater 176,177 Heat Pipe

Claims (4)

[Claims] 1. An antenna device comprising an antenna horn (3) and a concave reflector (2) electrically opposed to the antenna horn, wherein a mounting means (2) provided on the back surface of the concave reflector (2).
1) A heat-insulating cover (50) which can be detached by (27)
An antenna device in which a blower (22) (23) including a heater is attached in the cover. 2. An antenna device comprising an antenna horn (3) and a concave reflector (3) electrically facing the antenna horn, the heat transfer comprising a heater (125) on the outer periphery of the antenna horn (3). An antenna device, wherein members (116) (117) are detachably attached. 3. An antenna horn (3), a concave reflector (2) electrically opposed to the antenna horn, and a sub-reflector (4) arranged between the antenna horn and the concave reflector. In an offset type antenna device, a cover (138) is attached to the back surface of the sub-reflector by a screw (145) for attaching the sub-reflector to a supporting frame (16) for supporting the sub-reflector, and the sub-reflector (4) is installed in the cover. ) An antenna device comprising a heater (139) in contact with the upper and lower parts of the back surface. 4. An antenna horn (3), a concave reflector (3) electrically opposed to the antenna horn, and a sub-reflector (4) disposed between the antenna horn and the concave reflector. In an offset type antenna device, a heater (16) is attached to a mounting screw (170) having a sub-reflector mounted on a support frame (16) for supporting the sub-reflector.
An antenna device, wherein a cover assembly (26) having 1) is detachably attached.