JPH0244800A - Radiowave absorbing tile - Google Patents

Abstract

PURPOSE:To simplify execution working by forming and fixing rear-leg materials comprising the different material from a ferrite molding body at the rear surface of the planar-ferrite molded body. CONSTITUTION:A plurality of rod shaped porcelain rear-leg meatrials 14 each having a rectangular cross section are aligned on the rear surface of a ferrite molded body 12 at a specified interval. The materials 14 are fixed with a bonding agent 16. As the bonding agent 16, an inorganic glass bonding agent is used. An inorganic binder such as water glass is added so as to form the inorganic glass bonding agent 16. The bonding agent 16 is provided between the ferrite molded body 12 which is molded and sintered beforehand and the rear-leg materials 14. When the device is burned under this state, the inorganic glass bonding agent 16 is fused and transformed into a glass state. Then, the ferrite molded body 12 and the rear-leg materials 14 are bonded. Thus the execution work of a radiowave absorbing surface is simplified, and the working cost is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a radio wave absorbing tile for preventing radio wave reflection failure.

(Problems to be solved by conventional techniques and inventions) In recent years,
As cities become more and more high-rise, the problem of interference with the reflection of TV waves by buildings, in which the reflected waves from buildings overlap with TV broadcast waves and cause ghosts on the screen, is attracting attention. Attempts have been made to attach ferrite plates with absorption properties to the walls of high-rise buildings.

By the way, the conventionally used ferrite plate has a size of about 10III x 10II11 (thickness) and a specific gravity of about 5, which is heavy, has weak adhesive strength with mortar, etc., and has a large coefficient of thermal expansion. However, it is not possible to directly fix such a ferrite plate to the back surface of a building frame, so various methods have been considered for fixing it to the wall surface of a building.

FIG. 5 shows an example. In this example, stepped portions 102 are formed on both sides of the ferrite plate 100, and as shown in FIG. It is fixed to the back of the building body through.

However, when fixing the ferrite plate by such a method, the holder 104 is required separately, the construction structure becomes complicated, the construction work becomes complicated, and the construction cost increases.

Therefore, as shown in FIG.
Attempts have been made to form a large number of irregularities, that is, sole feet 108 and 110, by partially scraping off the back surface of the ferrite plate 106, and to fix the ferrite plate 106 directly to the back surface of the box with mortar or the like. Sole foot tOa.

By forming the ferrite plate 110, the adhesive force to the back surface of the frame is increased, thereby increasing the reliability when the ferrite plate 106 is directly adhesively fixed to the back surface of the frame.

According to this method, it may seem easy to fix the ferrite plate 108 directly to the back of the frame, but as mentioned above, the adhesive strength between the ferrite plate and mortar etc. is originally weak, and in addition, the ferrite plate Because the coefficient of thermal expansion is different from that of mortar, etc., if a ferrite plate is fixed directly to the back of a building structure, cracks will appear in the sole part as the ferrite plate repeatedly expands and contracts due to thermal expansion, and in some cases, adhesive cloth may There is a risk of A-separation and falling off the wall, which is extremely dangerous.

(Means for Solving the Problems and Actions/Effects) The radio wave absorbing tile of the present invention was devised to solve the above problems, and its gist is that , by forming and fixing a sole material made of a material different from the ferritic molded body.

That is, in the present invention, instead of forming soles directly on the ferritic molded body, a sole material made of a different material from the ferritic molded body is formed and fixed on the back surface of the molded body, and then formed on the sole material itself. Due to the unevenness or the unevenness created between the sole material and the back surface of the ferritic molded material, the radio wave absorbing tile made of the ferritic molded material and the sole material is attached to the back surface of the building via mortar etc. I made it fixed. If a ceramic material is used as the sole material, the radio wave absorbing tile can be well adhesively fixed to the back surface of the building frame in the same way as conventional ceramic tiles. Furthermore, since the ceramic material has a coefficient of thermal expansion similar to that of building materials such as mortar, there is no fear that the radio wave absorbing tile will be adhesively peeled off from the back surface of the building frame even if thermal expansion and contraction are repeated.

Therefore, if such a radio wave absorbing tile is used, it can be constructed with a simple structure similar to the conventional ceramic tile, and accordingly, the construction work is simplified and the construction cost is reduced.

In addition, when molding the ferritic molded body and the sole material separately and bonding them together, use an organic adhesive as the adhesive.

Although any inorganic adhesive can be used, an inorganic adhesive is preferable in consideration of long-term weather resistance, aging, etc.

Further, especially when a ceramic material is used as the sole material, it is desirable to use a glassy inorganic adhesive as the adhesive. In this case, it is possible to increase the adhesive strength between the ferritic molded body and the sole material, and at the same time, the thermal expansion coefficient of the adhesive layer can be made intermediate between that of the ferritic molded body and the sole material, and the adhesive layer This makes it possible to absorb the difference in thermal expansion and contraction between the ferritic molded body and the sole material.

(Example) Next, embodiments of the present invention will be described in detail based on the drawings.

In Figures 1 and 2, 10 is a radio wave absorbing tile as an example of the present invention, the size of which is 100 mm x 100 mm.
On the back side of the ferritic molded body 12 with a thickness of about 1 (thickness),
A plurality of rod-shaped ceramic legs 14 having a rectangular cross section are arranged at predetermined intervals and fixed with an adhesive 16. Here, as the adhesive 16, a vitreous inorganic adhesive is used. Glassy inorganic adhesives include, for example, feldspar, solvents,
It is made of frit, etc., and melts and becomes vitrified by heating. This vitreous inorganic adhesive 1
6 to bond the ferrite molded body 12 and the sole material 14, an inorganic binder such as water glass is inserted between the ferrite a molded body 12 formed and sintered in advance and the sole material 14. They may be fired at an appropriate temperature of 700 to 1000°C with the vitreous inorganic adhesive 16 added therebetween. In this way, the vitreous inorganic adhesive 16 melts and becomes vitrified, forming ferrite. The molded body 12 and the sole material 14 are bonded together. At this time, the inorganic binder hardens and prevents dispersion until the vitreous inorganic adhesive 6 melts due to its viscosity, and the vitreous inorganic adhesive 16
and ferritic molded body 12. It acts to keep the three parts of the sole material 14 adhesive.

The ferritic molded body I2 and the sole material 14 have thermal expansion coefficients of 9 to 11X10-67"O and 6 to 8X1, respectively.
0 to 6/℃, it is desirable to set the thermal expansion coefficient of the vitreous inorganic adhesive 16 to 7 to 10XlO to 6/"C. In this way, the thermal expansion coefficient becomes gradual, and the king's Peeling at the adhesive interface can be effectively prevented.

In the radio wave absorbing tile IO having the above configuration, the sole material 14 is made of a different type of ceramic material from the ferritic molded body 12, so it is attached to the back side of the building frame through mortar etc. like a normal ceramic tile. If the radio wave absorbing tile IO of this example is used, which does not cause the problem of peeling even when fixed, it becomes possible to construct the wall surface of a building in the same way as an ordinary tile. This simplifies the construction work of radio wave absorbing walls, which was previously a tedious task, and reduces construction costs.

In addition, in the present invention, the radio wave absorbing tile can be configured in various forms other than those described above.

FIGS. 3 and 4 show an example. Among these, the radio wave absorbing tile 18 shown in FIG. Molded body 12
It is fixed to. In this way, the bonding area between the ferritic molded body 12 and the sole material 20 can be increased, and the adhesive strength between the ferritic molded body 12 and the sole material 20 can be further increased.

On the other hand, in the radio wave absorbing tile 22 shown in FIG. 4, the sole material 24 is composed of a single plate-like body, similar to the radio wave absorbing tile 18 shown in FIG. It is slanted in a tabular shape to form a dovetail foot shape. In this way, when the sole foot 25 is buried inside the fixing building material such as mortar, the anchoring effect of the sole foot 25 is enhanced, and the effect that the radio wave absorbing tile 22 is more firmly fixed to the back surface of the building structure is produced. .

In the present invention, instead of forming and firing the ferritic molded body and the sole material in advance and then fixing them with an adhesive as described above, it is also possible to fix them by molding both at the same time and sintering them together. It is also possible to use materials other than the above-mentioned ceramic materials as the sole material.For example, mortar, concrete, FR
It is possible to use P, etc.

Furthermore, as mentioned above, an inorganic adhesive such as glass is preferable as the adhesive, but other inorganic adhesives or organic adhesives may also be used. It is possible to configure it with various modifications based on knowledge.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a radio wave absorbing tile that is an embodiment of the present invention, and FIG. 2 is a sectional view of the main part of the radio wave absorbing tile.
FIGS. 3 and 4 are perspective views of radio wave absorbing tiles according to still other embodiments of the present invention. FIG. 5(A) is a perspective view showing an example of a conventional ferrite board, and FIG. 5(B) is an explanatory diagram for explaining the construction method of the ferrite board.
FIG. 6(A) is a perspective view showing another example of a conventional ferrite plate. , 24: sole foot material 25: sole foot

Claims (1)

[Claims] A radio wave absorbing tile characterized in that a sole material made of a material different from the ferritic molded body is formed and fixed on the back side of a plate-shaped ferritic molded body.