JPH0348502A - Reflecting mirror of parabolic antenna and manufacture of reflecting mirror of parabolic antenna - Google Patents

Abstract

PURPOSE:To obtain a reflecting mirror of a parabolic antenna by embedding a reticulated reflecting member along the front in a deflected position of the front side of the reflecting mirror of a synthetic resin material in which fibers are mixed. CONSTITUTION:First of all, a reflecting member 8 and a reinforcing net 41 of a glass fiber are superposed on the forming surface by placing the net 41 first. Subsequently, a forming material 42 is superposed. The material 42 consists of approximately 47% CaCO3, 32% polyester resin, and 21% glass fiber. When the upper die 35 provided with a nut 43 in a forming part 38 is allowed to descend to the lower die 31, allowed to further descend by fitting a bar 40 into a hole 34, and pressed by prescribed pressure, a reflecting mirror is obtained between the forming surfaces 32, 36. During this time, the forming material 42 runs along the reflecting member 8, while being expanded, and moves in the peripheral edge direction of the forming surface 32 together with the reinforcing net 41. When the forming is ended, the reinforcing net 41 and the reflecting mirror 8 approach the front being a reflecting mirror and embedded without creases, and the reflecting mirror having a satisfactory electrical characteristic and a long service life is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parabolic antenna, and more particularly to a reflecting mirror thereof and a method for manufacturing the same.

Since then, the main body of parabolic antenna reflectors has been molded using synthetic resin materials such as reinforced plastics, and metal dips have been attached to the reflective surface during molding (for example, in Japanese Patent Application Publication No. 5 9 - 2 2 3 00
See Publication No. 7 p, g). In the above case, molding methods using thermosetting synthetic resin and plasticizing synthetic resin are disclosed, but in both cases, the life of the metal foil attached to the repellent surface is short. There was a problem.

Therefore, in the present invention, even if any of the above resins is used, the life of the reflective surface will be longer regardless of the type of resin material! 1 mirror and its manufacturing method.

In order to achieve the above purpose, this book. The invention is a reflective mirror made of synthetic resin material T4, which has about 21% impregnation, and a radio wave reflecting surface is formed along the front surface at unevenly distributed positions on the front side of the mirror. After the net-like anti-anatomical member is placed along the anti-I+1 mirror and the molding surface to form the anti-anatomical front surface of the mold, a fiber is placed. This method is based on a method for manufacturing reflectors for disassembled antennas, which involves filling and molding synthetic resin materials. The drawings showing the embodiments of the present application will be explained below. 1 to 8, l is a foundation, 2 is a ball fixed to the foundation l, 3 is a support device attached to the upper end of the ball, 4 is a parabolic antenna (offset parabolic antenna) whose direction is adjusted by the support device 3, Supported with adjustable elevation angle. In this antenna, reference numeral 5 denotes a reflecting mirror, and the back surface thereof has a well-known reinforcing glue 6. The rib is fixed to the support device 3. The reflecting mirror 5 is formed by embedding a reflecting member 8 in the front surface 5a side of a base material 7 made of synthetic resin. The base material 7 is made of unsaturated polyester, calcium carbonate, and glass fiber. Its thickness is, for example, about 2.5 cm. On the other hand, the anti-prick member 8 substantially constitutes a reversible surface on the front surface 5a side of the reflecting mirror 5, and is formed using, for example, a 30 to 40-mesh wire mesh made of brass. Reference numeral 9 denotes a reflection center indicating mark provided on the front surface of the reflection mirror 115, which indicates the electrical reflection center of the reflection mirror 5. The electrical reflection center is the center position of the circular shape of the reflective mirror 5 when viewed from the arrival direction of the radio waves to be received, as shown in FIG. This position is the position where the radio waves reflected by the reflector can be most efficiently received when the radiation center of the primary radiator, which will be described later, is directed there. The size of the mark 9 is, for example, about 2III in diameter and 1 in height.

The mark 9 is not limited to being formed in a protrusion shape as described above;
It may also be formed in the shape of a small hole as shown in Figure 6. Further, its front shape may be formed into a ring shape as shown in FIG. 7(A), or a cross shape as shown in FIG. 7(B). Furthermore, the mark 9 is not limited to being formed integrally with the base material 7 of the reflecting mirror 5, but may also be formed separately, or a thin sticker may be attached to the reflection center, or a printing means may be attached to the center of the reflection. It may also be written with . Next is a connecting member, the base of which is fixed to the lower part of the reflector 5 with a fixing bolt 12. l3 is the auxiliary arm,
Its base is fixed to the edge of the reflecting mirror 5, and its tip is fixed to the tip of the connecting member l1. Next, the mouth is the primary grazing device attached to the tip of the connecting member 11! 5 is the converter attached to the Hiroshi +4, and l6 is the output terminal of the converter. Further, l7 is a power supply line, one end of which is connected to the output terminal l6 using a connector l8, and the other end connected to an indoor receiving device.

In the configuration described above, when a microwave radio wave, for example, 11.7!398 to 12.0095 GHz, arrives from a broadcasting satellite, the radio wave is reflected by the reflector 5 and focused toward the primary emitter l4. The focused radio waves are introduced into the inside of the radiator 14 from the frontage +4a, and further pass through a high frequency amplification section, a frequency conversion section, etc. provided in the converter 15, and then are converted to an intermediate frequency (1.03598~!.3315).
0 GHZ) signal, and the converted intermediate frequency signal is sent from the output terminal I6 to a power supply line (for example, a coaxial cable > +7), and is sent to the next receiving device via that cable.The above primary radiation The opening 14a of the radiator +4 is opposed to the electrical reflection center of the reflector 5, that is, the mark 9.In other words, the radiation center of the primary radiator 14 passes through the mark 9.Therefore, the above-mentioned receiving If the primary radiator!4
The zero frontage portion 14a can receive the largest amount of radio waves reflected from the reflecting mirror 5, and can receive the target radio waves with high efficiency.

Next, in the manufacturing process of the parabolic antenna with the above configuration,
The inspection method after setting it up in the morning will be explained with reference to FIG. 5 of the drawing. In the inspection jig 20 shown in FIG. 5, reference numeral 21 denotes a cap, which is shaped so as to fit snugly over the periphery of the jaw portion 14a of the primary emitter 14. 22 is a rod fixed to the cap 21, and the cap 2l
The relationship between this is that when the cuff 21 is placed over the primary radiator l4, this rod 22 is located at the firing center 14b of the primary radiator 14.
It is located at . When inspecting using the inspection jig 20 as described above, the cap 2I is fitted onto the primary radiator 14. Then, it is checked whether the tip of the rod 22 is located close to and facing the mark 9 (whether there is any deviation).

If the tip of the rod 22 is in a position directly facing the mark 9, the positional relationship between the reflector 5 and the primary radiator 14 is appropriate. In addition, if the tip of the rod 22 and the mark 9 are not directly opposed to each other, that is, if there is a misalignment between the two, the attachment part between the reflecting mirror 5 and the connecting member 11, or the connecting member +1 and the primary radiator l4. Adjust the fixing portions of the rod 22 so that the tip of the rod 22 is directly opposed to the mark 9.

Next, reference numeral 23 indicates a different inspection jig. This inspection jig 2
3 is a cap 24 that is placed over the primary emitter l4
The light emitting part 25 is attached to the. The light emitting section 25 has a built-in lamp and a battery, and emits light as indicated by an arrow 26. The axis of the light is the cap 24
When placed over the primary radiator 14, it coincides with the radiation center of the primary radiator 14 as described above.

When performing an inspection using such an inspection jig 23, it is sufficient to place the cap 24 on the primary radiator and make sure that the light emitted from the light emitting section 25 hits the mark 9 in a spot shape. Next, in FIG. 8, when the connecting member I1 is attached to the reflector 5 during the process of assembling the parabolic antenna,
A situation is shown in which the inspection jig 27 is used to check whether the installation (na) is correct or not.
and is formed in the same shape as the converter 15,
It can be attached to the tip of the connecting member 1l in a similar state. This jig 27 also has a lamp 28 inside.
When the switch 30 is turned on, light is emitted from the light emitting section 29 at the tip in the same way as in the case of the jig 23. When inspecting the connection relationship between the dissecting scope 5 and the connecting member 11 using such a jig 27, the jig 27 is attached to the connecting member 11.
It is sufficient to attach it to the tip of the mark 9 and check whether the light emitted from the emission part 29 reaches the position of the mark 9. Next, FIGS. 9 to 16 show a manufacturing method 7 for the reflecting mirror 5. In these figures, reference numeral 31 denotes a lower mold, which has a molding surface 32 for molding the front surface 5a of the mirror 5 and a concave mark molding part 33 for forming the mark 9. 34 indicates the guide hole. The lower mold 31 is equipped with a heating means, and the molding surface 32 is heated to a predetermined temperature, for example, 1.
It can be heated to 700℃. Next, numeral 35 is an upper mold, which has a hole 36 for molding the rear surface of the reflecting mirror 5 and a mold 137 for molding ribs. Further, numeral 38 denotes a molded portion for forming a fastening portion of the connecting member 1l, and numeral 39 represents a molded portion for forming a fastening portion of the auxiliary arm 13. 40 is a guide rod,
This is for fitting into the guide hole 34 and positioning the lower mold 31 and the upper mold 35. Further, the upper mold 35 is equipped with a heating means for heating the molding surface 36 similarly to the lower mold 3l.

Next, a procedure for forming an anatomical scope using the above-mentioned mold will be explained. First, the anti-corrosion member 8 and the reinforcement 144+ for reinforcing it.
Prepare. As the reinforcement IIIi 41, a cloth-like (also referred to as T!4-like) glass fiber, which has a comparatively stronger tensile strength than the constituent material of the reflective member 8, is used. The above reflective member 8 and reinforcing net 4l! ! Molding surface 32
Cut it into an oval shape in advance according to the size. The anti-reflective member 8 and the reinforcing net 4l are first superimposed on each other. Then, place the superimposed one on top of the molding surface 32, reinforcing 3Jl! 41 is placed on the molding surface 32 side. Next, a molding material 42 is placed on top of the reflective member 8. The molding material 42 used is a mixture of calcium carbonate, polyester resin, and glass fibers, which is then formed into a sheet (referred to as SMC). The above SM
C42 is cut into short pieces as shown in the figure, and used by stacking them as shown in the figure. The shape in which the molding material 42 is arranged on the mold (called a charge pattern) is determined so that when molding the anti-peeling mirror 5, the molding material can sufficiently spread to every corner of the mold. The mixing ratio of the raw materials for the molding material 42 is, for example, approximately 47% calcium carbonate, 32% polyester resin, and 21% glass fiber. Note that the above molding material may be a thermosetting resin. Next, as shown in FIG. 11, insert nut 43
The upper mold 35 in which the molding part 38 of the fastening part is provided is attached to the lower mold 3l.
Lower it towards. Then, insert the guide rod 40 into the guide hole 3.
4 and further lower the upper mold 35. And upper mold 3
5 to the lower mold 31 at a predetermined pressure (for example, 300 to +500
} is determined within the range of ) From here on, as shown in FIG. 12, the forming surface 32. Reflector 5 is formed between 36 and 36.

In the case of pressure molding as described above, the molding material 42 moves as shown by arrow 44 in FIG. That is, the molding material 42 is moved toward the corner along the reflective member 8 while being pushed and spread by the pressing force of the upper die 35. For this reason, the reinforcement net 41.
The reflective member 8 is maintained pressed against the molding surface 32. Moreover, the molding material 42 moves while pulling them toward the periphery of the molding surface 32. For this reason, the 12th
As shown in the figure, when the molding is completed, the reinforcing net 41 and the reflecting member 8 are embedded in a position extremely close to the front surface 5& serving as a reflecting mirror, as shown in FIGS. 14 and 15. Moreover, they are embedded without wrinkles over the entire surface of the reflection B5. A mirror in which the reflective member 8 is embedded close to the front surface 5a without wrinkles has good electrical characteristics as a reflective mirror.

When pressurizing 42 tt of molding material with the upper die 35 as described above, the polyester resin becomes 16th due to the pressurizing force and high temperature.
As shown by an arrow 45 in the figure, it reaches the molding surface 32 through (penetrating) the texture of the reflective member 8 or the reinforcing net 4l. For this reason! As shown in Figure 2, when the molding is completed, the reinforcing net 4
11 The reflecting member 8 is completely embedded in the base material 7 of the reflecting mirror, and its peeling is prevented. When pressure molding is performed as described above, the wound member 8 is reinforced by the molding material 42 that is successively expanded. ! I
41, each strand of the wound wound member 8 enters between the meshes of the reinforcing net 4l. As a result, the molding material 42 is applied to the molding surface as shown by the arrow 44!
Even if the reflective member 8 moves sequentially to the side of the 1 circle, the reflective member 8 is only stretched together with the reinforcing net 4l until the reinforcing net 4l is stretched tightly as described above, and then the reflective member 8 is stretched further than the reflective member 8. Excessive tension is prevented by the strong reinforcing net 4l. This prevents the reflective member 8 from breaking.

Next, FIGS. 17 to 20 show a reflecting mirror 5 (commonly called 75 cm, with a short axis of about 5 cm) formed as described above. In the reflecting mirror 5 formed as described above, FIGS. 19 and 201
! As shown in I, bulges 46, 46 are integrally formed at the base of the rib 6. Therefore, in the case of the above molding, sink marks are unlikely to occur on the front surface 5a of the reflector at the rib 6 portion. For this reason, in the completed reflecting mirror 5, the front surface 5a is a surface that is smoothly continuous with other parts. When such a reflecting mirror reflects radio waves, there is no disturbance in the reflection even in the portion 5a, and the electrical characteristics as a reflecting mirror are good. Incidentally, the bulging portion 46 may be formed as shown by the double-dotted chain in FIG. Next, Figure 21 shows the back side of a reflector commonly called 100cm. The short axis of this recess 5l is approximately 1 m, and a number of reinforcing lips 52 are provided on the back side as shown in the figure.

Next, Fig. 22 shows different examples of reinforcing nets and reflective members. In this example, a metal wire 54 as a repellent member is attached to the glass fiber 53 constituting the reinforcement JN41 in a winding state as shown in the figure.
5 as shown in the figure to make a one-piece net-like cloth)
It is formed in In the molding process shown in FIG. 9, a relatively strong reinforcing net is attached to the molding surface 32.
, the reflective member made of the metal wire 54 is also placed at the same time, and as a result, both can be handled together with less effort, making the handling process easier.

As mentioned above, in this invention, 5. Since the reflective member 8 is embedded in the front surface 5a of the lj mirror δ, the life of the reflective member 8 is long, and the reflective mirror 5 can be used for a long period of time. Further, according to the manufacturing method of the present invention, during molding, the fibers in the resin are filtered there even if they try to pass through the reticulation member 8 toward the front surface 5a, and the fibers in the resin are filtered there. 5a is made of resin with less fibrous material and has the effect of being formed smoothly and beautifully.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a partially cutaway side view, FIG. 2 is a view in the direction of the ■ arrow, and FIG.
Figure 4 is an enlarged partial cross-sectional view of the vicinity of the electrical reflection center of the mirror, Figure 5 is a cross-sectional view showing the inspection state, and Figure 61! l is a cross-sectional view showing a different example of the structure near the center of electric reflection of the reflecting mirror;
FIG. 7 is a front view showing different examples of reflective center indication marks;
Fig. 8 is a perspective view showing an intermediate inspection when the parabolic antenna is in the morning, Fig. 9 is an exploded perspective view to explain the molding process of the reflector, Fig. 10 is a partially enlarged view of the upper mold, and Fig. 11 Figure 12 is a vertical cross-sectional view showing the state immediately before molding, Figure 12 is a vertical cross-sectional view showing the completed molding state, Figure 13 is a diagram for explaining the movement of the molding material, and Figure 14 is the XIV section in Figure 12. 15 is an enlarged view of the same xV part, FIG. 16 is a diagram showing the flow of polyester resin during molding, FIG. 17 is a rear view of the molded k-reflector, and FIG. 18 is a side view of the same. 1
Figure 9 is a sectional view taken along the line xtx-xix, and Figure 20 is a cross-sectional view taken along the line xx-xx.
21 is a rear view of a different reflecting mirror, and FIG. 22 is a partial view showing different examples of reinforcing nets and anti-reflection members. 5...Reflector, 8...Reflector,! 1. Consolidation III
L material, 14... Primary radiator, 32... Molding surface, 4l
...Reinforcement net. Fig. 8 Fig. 1 Fig. 5 Fig. 4 Fig. 6 Fig. 7 Fig. 10 Fig. 11 Fig. 12 Fig. 14 Fig. 15 Fig. 19 Fig. 17 Fig. 18

Claims (2)

[Claims] (1) A reflector made of a synthetic resin material containing about 21% fiber, with a net-like structure at unevenly distributed positions on the front side to form a radio wave reflecting surface along the front surface. A parabolic antenna reflector characterized by having a reflecting member embedded therein. (2) Reflection of a parabolic antenna characterized in that a net-shaped reflective member is placed along the molding surface for forming the front surface of the reflective mirror in a mold, and then a synthetic resin material mixed with fibers is filled and molded. Mirror manufacturing method.