JPH0348503A - Manufacture of reflecting mirror of parabolic antenna - Google Patents

Abstract

PURPOSE:To obtain a reflecting mirror of a parabolic antenna of a long service life by superposing a reinforcing net, and next, a reticulated reflecting member on the forming surface side of a die, and filling and forming a synthetic resin in which fibers are mixed. CONSTITUTION:A reinforcing net 41 of a glass fiber, a reflecting member 8, and a forming material 42 are superposed on the forming surface 32. 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 surface 32 and 36. During this time, the material 42 expands, while drawing the reflecting member 8 and the reinforcing net 41 to the periphery of the forming surface 32, the reflecting member approaches the front of the reflecting mirror, embedded without creases, the reflecting mirror having a satisfactory electric characteristic is obtained, and a service life of the reflecting member 8 is also extended.

Description

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

Conventionally, the main body of parabolic antenna reflectors is molded using a resin material, for example, a synthetic resin material such as reinforced plastic, and metal foil is attached to the reflective surface during the molding process. See publication>.

In the above case, two forming methods have been disclosed, one using thermosetting synthetic resin and the other using thermoplastic synthetic resin, but in both cases, the life of the metal foil attached to the reflective surface is short. There was a problem.

Therefore, the present invention provides a manufacturing method that can produce a reflecting mirror with a long lifespan of the reflecting surface, regardless of the type of resin material, with a low defect rate, even when using any of the above resins.

In order to achieve the above object, the present invention provides a molding surface for forming the front surface of a reflecting mirror in a mold, in which a net-shaped reinforcing net is located on the molding surface side, and then a net-shaped reflective member is placed on the molding surface side of the molding surface. A reflector for a parabolic antenna, characterized in that a net-like reinforcing net and a net-like reflecting member are aligned in a superimposed manner in a position, and then filled with a synthetic resin material mixed with fibers and molded. It is designed to provide a manufacturing method.

The drawings showing the embodiments of the present application will be described below.

1 to 8, 1 is a foundation, 2 is a ball fixed to the foundation 1, 3 is a support device attached to the upper end of the ball,
4 is a parabolic antenna (offset parabolic antenna)
It is supported by a support device 3 so that the direction and elevation angle can be adjusted freely. In this antenna, reference numeral 5 denotes a reflecting mirror, and the back surface thereof has well-known reinforcing ribs 6. The rib is fixed to the support 13. 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 unsaturated polyester,
It is made of calcium carbonate and glass 1M fiber. Its thickness is, for example, 2.5+mm ri. On the other hand, the reflecting member 8 substantially constitutes a reflecting surface on the front surface 5a side of the reflecting mirror 5, and is made of, for example, 30mm brass.
Formed using ~40 mesh wire mesh.

Reference numeral 9 denotes a reflection center indicating mark provided on the front surface of the reflection mirror 5, which indicates the electrical reflection center of the reflection mirror 5. That t
The ljIc reflection center is reflected from the arrival direction of the radio wave to be received, as shown in Figure 3! ! When looking at 5, if the shape of the reflecting mirror is circular, this is the center position of the circle. 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 2 ma in diameter and 1+w 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 FIG. 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 7 of the reflecting mirror 5, but may be formed separately, or a thin sticker may be attached to the reflecting center, or it may be printed on the reflecting center. It may also be expressed using means.

next! 1 is a connecting member, the base of which is fixed to the lower part of the reflecting mirror 5 with a bolt 12. 13 is an auxiliary arm, the base of which is attached to the edge of the reflector 5, and the tip of which is attached to the connecting member 1l.
They are attached to the tip of each. Next, 14 is the connecting member I1
15 is the radiator l4 attached to the tip of the primary radiator.
A converter is installed on the converter, and 16 indicates the output terminal of the converter. Also, l7 is a power supply line, one end of which is connected to connector 18.
The other end is connected to an indoor receiving device. In the above configuration, microwave radio waves from the satellite are transmitted, for example, 11.71398 to 12.
0095G}12(7) When a radio wave arrives, the radio wave is reflected! j1 5 and is focused towards the primary stinger l4. The focused radio waves are transmitted through the opening 14a of the radiator 14.
is introduced into the interior of the converter 15, and is further converted into an intermediate frequency signal (1.03598 to 1.33150G}12) through a high frequency amplification section, a frequency conversion section, etc. provided in the converter 15, and further the converted intermediate The frequency signal is sent from the output terminal 16b) to a power supply line (for example, a coaxial cable) 17, and is sent to the next receiving stage Ha via the cable. The frontage 14a of the single-blow radiator 14 is opposed to the electrical reflection center of the reflector 5, that is, the mark 9. In other words, the firing center of the primary radiator l4 is made to pass through the position of mark 9. Therefore, in the case of the above-described reception, the opening 14a at the mouth of the primary cage can receive the largest amount of radio waves reflected from the reflector 6, 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 it is assembled is shown in Figure 5.
This will be explained with reference to the figures. Inspection jig 20 shown in FIG.
In the figure, 2l is a cap, which is formed so as to fit snugly over the periphery of the opening 14a of the primary radiator l4. Reference numeral 22 denotes a rod fixed to the cap 21, and its relationship with the cap 2l is such that when the cap 21 is placed over the primary radiator l4, the rod 22 is located at the radiation center 14b of the primary radiator l4. There is. When inspecting using the inspection jig 20 as described above, fit the cap 2l onto the primary radiator l4. Then, it is inspected whether the tip of the rod 22 is located close to and facing the mark 9 and whether there is any deviation. If the tip of this rod 22 is in a position directly facing the mark 9, the reflector 5
The positional relationship between this and the primary radiator l4 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 +1 or the connecting member 11 and the primary radiator l4 Adjust the fixing parts of the rod 22 so that the tip of the rod 22 is directly opposite the mark 9! ! I do. Next, numeral 23 indicates a different inspection jig. This inspection jig 23 has a light emitting section 25 attached to a cap 24 which is placed over the primary radiator 14. 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 coincides with the center of radiation of the primary radiator l4 as described above when the cap 24 is placed over the primary radiator l4.

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, FIG. 8 shows a situation in which a connecting member 1l is attached to the reflection n5 during the process of assembling the parabolic antenna, and an inspection is performed to see if the attachment is correct. In the figure, the inspection jig 27 is the primary radiation device! 4 and the converter 15, and can be attached to the tip of the connecting member 1l in the same condition. Further, this jig 27 is equipped with a lamp 28 and a battery inside, and when a switch 30 is turned on, light is emitted from a light emitting portion 29 at the tip in the same manner as in the case of the jig 23. When inspecting the connection between the reflecting mirror 5 and the connecting member 11 using such a jig 27, the jig 27 is used as the connecting member II.
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 or not.

Next, FIG. 9 to FIG. 16 show a method for manufacturing the reflecting mirror 5. It has a surface 32 and a concave mark forming part 33 for forming a mark 9. 34 indicates a guide hole.

The lower mold 3l is equipped with a heating means and can heat the molding surface 32 to a predetermined temperature, for example, 170''.Next, 35 is an upper mold for molding the rear surface of the reflecting mirror 5. It has a molding surface 36 and an II 37 for rib molding.

Further, 38 is a molded part for forming a fastening part of the connecting member l1,
39 shows molded parts for forming the fixing parts of the auxiliary arm l3. Reference numeral 40 denotes a guide rod which is fitted into the guide hole 34 to position the lower die 31 and the upper die 35. The upper mold 35 above is equipped with heating means for heating the molding surface 36 similarly to the lower mold 3l. Next, we will explain the procedure for forming a reflector using the above mold. First, the reflective member 8 and the reinforcement 1llll to reinforce it.
Prepare 41. As the reinforcing net 4l, a cloth-like (also referred to as a net-like) material woven from glass fibers having a comparatively stronger tensile strength than the constituent material of the reflective member 8 is used.
Also, the reflective member 8 and the reinforcing net 4! is cut into an elliptical shape in advance to match the size of the molding surface 32. The reflective member 8 and the reinforcing net 4l are first superimposed on each other. Then, the superimposed material is placed on the molding surface 32 with a reinforcing net LL.
1 is placed on the molding surface 32 side. Next, a molding material 42 is placed on top of the wound member 8. The molding material 4
As No. 2, a sheet made by mixing calcium carbonate, polyester resin, and glass II fiber (called SMC) is used. The SMC 42 is cut into strips as shown in the figure, and used by overlapping them as shown in the figure. The shape in which the molding material 42 is arranged on the mold (referred to as a charge pattern) is determined so that the material is sufficiently spread to every corner of the mold when molding the reflecting mirror 5. The mixing ratio of the raw materials for the molding material 42 is, for example, 47% calcium carbonate, 32% polyester resin, and glass! i: II is about 21%. Note that other thermosetting resins may be used as the molding material. Next, as shown in FIG. 11, the upper mold 35, in which the molded part 38 of the fastening part is equipped with the insert nut 43, is lowered toward the lower mold 3l. Then, the guide rod 40 is fitted into the guide hole 34, and the upper mold 35 is further lowered. Then, by pressing the upper mold 35 against the lower mold 31 with a predetermined pressure (for example, determined within the range of 300 to +500 mm), the twelfth mold is pressed.
As shown in the figure, molding 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, 4l of reinforcing nets,
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
When the molding is completed as shown in the figure, the reinforcing net 41 and the scraping member 8 are embedded in a position extremely close to the front surface 5a of the mirror as shown in FIGS. 14 and 15. There is. Moreover, they are embedded over the entire surface of the reflecting mirror 5 without wrinkles. A mirror in which the reflective member 8 is in contact with the front surface 5a and is embedded without wrinkles has good electrical characteristics as a reflective mirror. When pressurizing the molding material 42 with the upper mold 35 as described above,
Depending on the pressure and high temperature, the polyester resin forms a reflective part t8 or a reinforcement part 44l as shown by the arrow 45 in FIG.
The molding surface 32 is reached through the weave (penetration) of the molding surface 32. Therefore, as shown in FIG. 12, in the state where the molding is completed, the reinforcement t! 441, the reflecting member 8 is completely embedded in the base material 7 of the reflecting mirror, and its peeling is prevented. When performing pressure molding as described above, the reflective member 8 is pressed against the reinforcing net 4l by the molding material 42 that is successively expanded, so each strand of the reflective member 8 is pressed against the reinforcing net 4.
It will be in a state where it will fit between the meshes of l. As a result, the molding material 42 flows 11 to the side around the molding surface as indicated by arrow 44.
11 + Even if the reflective member 8 moves, the reinforcing net 4l
Reinforce it to the point where it becomes taut as mentioned above.
It is only stretched out together with the reflective member 8, and then excessive tension is prevented by the reinforcing net 4l, which is stronger than the reflective member 8. This prevents the reflective member 8 from breaking.

Next, FIGS. 17 to 20 show an anti-peeling mirror 5 (commonly called a 75-bi mirror, with a minor axis of about 75 mm) formed as described above. In the reflecting mirror 5 formed as described above, bulges 46, 46 are integrally formed at the base of the rib 6, as shown in FIGS. 19 and 20. Therefore, in the case of the above molding, sink marks are unlikely to occur on the front surface 5a of the reflecting mirror in the lip 6 portion. For this reason, in the completed reflecting mirror 5, its 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 at 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. Against this! Each mirror 5l has a short diameter of approximately 1 m, and its back surface is provided with a large number of reinforcing lips 52, as shown in the figure.

Next, Fig. 22 shows different examples of reinforcing nets and reflective members. In this example, a metal wire 54 serving as a reflective member is attached to the glass LLI fiber 53 constituting the reinforcing net 4l, and the wire 54 is wound around the surface of the glass LLI fiber 53 as shown in the figure.
5 is woven as shown in the figure to form an integral mesh (cloth-like)
It is formed in In the shaping process shown in FIG. 9, a relatively strong reinforcing net is attached to the forming 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 described above, according to the manufacturing method of the present invention, the anti-incision member 8 is buried on the front surface 5a side of the reflecting mirror 5, so the anti-incision member 8
has a long lifespan, and is effective in providing a reversible mirror 5 that can be used for a long period of time. Also of the claimed invention! ! According to the law, II! in the resin during molding! In II, since the reinforcing net 4l and the reflective member 8 are net-like, even if you try to pass through them and head toward the front side 5a, #! I was treated and reflected! The front surface 5a of 5 is made of a resin material with low fiber quality and is smooth and beautiful. It has the effect of forming a strong structure.

Furthermore, in the present invention, during molding, the shaped surface 3
2, the net-like reinforcing net 4l is located on the molding side, and the net-like reflective member 8 is next located, and the net-like reinforcing net H41
and the rope-shaped reflective member 8 are aligned in a polymerized manner, and then filled with a synthetic resin material and molded.In addition, the above effect can be obtained. As described above, the reflective member 8 is entangled with the reinforcing net 41 at various places, and the reinforcing net 41 has the feature of reinforcing the tensile strength of the reflective member 8. This makes it possible to use a material with low strength as the reflective member 8, so it is useful to widen the range of material selection. It is useful in reducing the incidence of non-defective products.

[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. 3 is a view in the direction of the
Figure 4 is against! 1 mirror! Fig. 5 is a sectional view showing the inspection state; Fig. 6 is a sectional view showing different examples of the structure of the reflector near the electrical reflection center; Fig. 7 is the reflection center. A front view showing different examples of instruction marks, Fig. 8 is a perspective view showing intermediate inspection during assembly of the parabolic antenna, Fig. 9 is an exploded perspective view to explain the molding procedure of the reflector, and Fig. 10 is the upper mold. FIG. 11 is a longitudinal sectional view showing the state immediately before molding, FIG. 12 is a longitudinal sectional view showing the state of completion of molding, FIG. 13 is a diagram for explaining the movement of the molding material, and FIG. The figure is a partial enlarged view of XIV in 12 [ffl, Figure 15 is a partial enlarged view of the same Rear view, Figure @18 is the same side view, Figure 19
20 is a sectional view taken along the line XX-XX, FIG. 21 is a rear view of a different reflecting mirror, and FIG. 22 is a partial view showing different examples of reinforcing nets and reflective members. 5...Anti! 1 mirror, 8... reflective member, 11... connecting member, 14... primary grazing device, 32... molding surface, 41...
・Reinforcement net. Figure 7 Figure 10 Figure 11 Figure 12 Figure γ. 31 3z Fig. 14 Fig. 15 Fig. 19 Fig. 17 Fig. 18

Claims (1)

[Claims] The molding surface for forming the front surface of the reflector in the mold is
With the net-like reinforcing net and the net-like reflective member positioned next to the molding surface side, the net-like reinforcing net and the net-like reflective member are aligned in a superimposed manner, and then fibers are mixed. A method for manufacturing a reflector for a parabolic antenna, which is characterized by filling and molding a synthetic resin material.