JP2003023312A - Production method for resin waveguide and resin waveguide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method for resin waveguide and a resin waveguide, with which the waveguide side in a waveguide requiring dimension accuracy can be molded from resins with high dimension accuracy. SOLUTION: Inside the waveguide, on the side of a metal mold 40 for molding the waveguide side, a cooling path 30, in which a cooling medium flows, is arranged along with the waveguide and resin molding is performed while arranging a resin injecting port 42 on the side of the metal mold 41 for forming the front side of the waveguide so that the resin waveguide can be formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin waveguide manufacturing method and a resin waveguide used as a component of a microwave transmitting / receiving device such as a satellite communication antenna, and more particularly, to a shape accuracy of the inner surface of the waveguide. The present invention relates to a method for manufacturing a resin waveguide and a waveguide, which can ensure high precision.

[0002]

2. Description of the Related Art In the past, microwave waveguides have often been formed of metal, but in recent years, the number of waveguides formed of resin has increased.

FIG. 6 shows a conventional technique (Japanese Patent Laid-Open No. 6-104615) relating to this type of resin waveguide. In this prior art, a thermoplastic base 101 having a U-shaped cavity 100 and a thermoplastic cover 1 having a U-shaped cavity 102.
03 is bonded with an epoxy adhesive to form an interconnecting waveguide structure 104, and an electrolessly plated copper surface is formed on an inner surface of the structure 104 to transmit microwave energy. A wave waveguide is formed. This prior art does not disclose a specific method for manufacturing the base 101 and the cover 103 itself.

[0004]

As in the prior art described above, when a resin waveguide is formed by injection molding a resin such as a thermoplastic resin, it is sufficient to apply a normal injection molding method. It is difficult to ensure the shape accuracy of the inner surface of the pipe with high accuracy. In particular, since it is necessary to strictly set the height and width of the waveguide corresponding to the frequency to be transmitted in the microwave or millimeter wave band, high dimensional accuracy is required. A manufacturing method was desired.

The present invention has been made in view of the above,
It is an object of the present invention to provide a resin waveguide manufacturing method and a resin waveguide in which a waveguide side inside a waveguide that requires dimensional accuracy can be resin-molded with high dimensional accuracy.

[0006]

In order to achieve the above object, a method of manufacturing a resin waveguide according to the present invention is a resin guide for forming a waveguide having a waveguide inside by molding a thermoplastic resin. In the method for manufacturing a wave guide, a cooling path through which a cooling medium flows is arranged on the mold side for forming the waveguide side inside the waveguide so as to extend along the waveguide, and the surface of the wave guide is formed. The resin waveguide is formed by arranging a resin injection port on the mold side for forming the side and performing resin molding.

According to the present invention, the resin injection port is arranged on the back surface side of the waveguide, and the cooling path is arranged on the waveguide surface side. As the solidification of the resin progresses, a resin flow path is secured on the back surface side of the waveguide until the inner surface of the waveguide is solidified, and molding resin pressure is applied to the inner surface of the waveguide until the shape is molded. .

In the method of manufacturing a resin waveguide according to the next invention, in the above invention, the waveguide is formed by joining a pair of waveguide blocks having waveguide grooves formed therein. It is characterized by

According to the present invention, the waveguide is formed by joining the pair of waveguide blocks having the waveguide groove formed therein.

A resin waveguide according to the next invention is manufactured by the manufacturing method according to any one of the above inventions.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a method for manufacturing a waveguide according to the present invention will be described in detail below with reference to the accompanying drawings.

The waveguide manufactured according to the present invention is used, for example, in the duplexer 3 of the microwave transmitting / receiving antenna for the ground station of satellite communication shown in FIG.

The microwave transmitting / receiving antenna shown in FIG.
A parabolic antenna reflector 1, a 90 ° phase shifter 2 for converting the circularly polarized wave reflected by the reflector into a linearly polarized wave and converting the linearly polarized wave from the duplexer 3 into a circularly polarized wave, the frequency or A duplexer 3 for both transmission and reception, which has a waveguide branched to divide an electromagnetic wave into a transmission wave and a reception wave depending on the phase.
And an electromagnetic wave in a waveguide mode propagating in the waveguide of the duplexer 3 is converted into a TEM mode electromagnetic wave for a microstrip line and a TEM from the microstrip line.
A waveguide / coaxial converter 4 for converting a mode electromagnetic wave into a waveguide mode. The duplexer 3 has a built-in short-circuit plate (not shown) made of a metal plate.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a diagram conceptually showing the configuration of the rectangular waveguide 10 used in the duplexer 3. The waveguide 10 is formed by joining a pair of waveguide blocks 10a and 10b made of a thermoplastic resin (ABS resin or the like) in which a groove 11 for a waveguide is formed.

Next, the procedure for manufacturing the waveguide 10 will be described with reference to FIGS. Here, the manufacturing procedure of one waveguide block will be described. FIG. 3 is a plan view showing a positional relationship between the waveguide-side cavity 20a of the mold and the cooling path 30, and FIG. 4 is a conceptual view showing a simplified mold for producing the waveguide 10. Shown in Fig. 5
4 is a sectional view taken along line AA of FIG. The metal plating applied to the inner wall surface of the waveguide of the waveguide 10 and the method of joining the waveguide blocks 10a and 10b are not essential to the present invention, and thus the description thereof is omitted here.

As shown in FIGS. 3 to 5, in this case, the upper and lower molds 40 and 41 form the cavity 20 corresponding to the shape of the waveguide block. PL is a parting line.

As shown in FIGS. 4 and 5, the waveguide 10
The gate 42 as a resin injection port is arranged in the mold 41 for forming the surface side of the above, and the mold 40 for forming the waveguide groove 11 of the waveguide 10 on the opposite side is filled with water. A cooling hole 30 through which a cooling medium such as oil flows is provided. The cooling hole 30 is formed in the vicinity of the waveguide groove 11 so as to extend along the waveguide groove 11. There is.

A method of molding an ABS resin waveguide using a mold in which such cooling holes 30 are arranged will be described. First, water or oil adjusted to a temperature of about 30 ° C. is allowed to flow through the cooling holes 30 to stabilize the temperature on the mold 40 side. Next, ABS resin (Mitsubishi Rayon 3001) heated and melted to about 240 ° C. is filled into the cavity 20 through the gate 42, and resin molding is performed.

As described above, in this embodiment, at the time of resin molding, the cooling path 30 through which the cooling medium flows is provided along the waveguide on the side of the mold 40 for forming the waveguide side inside the waveguide. Since the resin is molded by arranging the gate 42 on the side of the mold 41 for forming the surface side of the waveguide to perform resin molding, solidification of the resin from the waveguide inner surface, which requires shape accuracy at the time of molding. As the resin progresses, the resin flow path is secured on the back surface of the waveguide until the inner surface of the waveguide is solidified, and the molding resin pressure is applied to the waveguide side until the waveguide shape is molded. It is possible to form a waveguide of the waveguide, and thus it is possible to provide a waveguide with good propagation efficiency.

Although the present invention is applied to the rectangular waveguide in the present embodiment, the present invention can also be applied to the circular waveguide. Further, in the above-described present embodiment, the waveguide is formed by joining the pair of waveguide blocks 10a and 10b in which the groove 11 is formed, but it is soluble (melts with water or a solvent). The present invention is also applied to the hollow portion by applying the present invention to the manufacturing method in which the primary molding product made of resin is set in the core mold and insert molding is performed, and then the core is eluted to mold the hollow waveguide. You may make it arrange | position a cooling path in.

Further, the resin waveguide formed by using the manufacturing method of the present invention is not limited to the microwave transmitting / receiving device for satellite communication shown in FIG. 1, but is applied to other arbitrary communication equipment and electronic equipment. can do.

[0022]

As described above, according to the present invention, a resin injection port is arranged on the back surface side of the waveguide and a cooling path is arranged on the waveguide surface side to perform injection molding to form a waveguide. Since it is formed, the resin solidification progresses from the inside surface of the waveguide, which requires shape accuracy during molding, and the resin flow path is secured on the back surface side of the waveguide until the inside surface of the waveguide solidifies. Since the molding resin pressure is applied to the inner surface of the waveguide until the shape is molded, the waveguide of the waveguide can be formed with high dimensional accuracy. A tube can be provided.

According to the next invention, since the waveguide is formed by joining the pair of waveguide blocks in which the grooves for the waveguide are formed, the hollow waveguide portion of the waveguide is formed. Can be easily created.

According to the next invention, since the resin waveguide is manufactured by using the manufacturing method described in any one of the above, a waveguide having a waveguide with high dimensional accuracy is obtained. It is possible to provide a waveguide with good propagation efficiency.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a microwave transmitting / receiving antenna to which a waveguide manufactured according to the present invention is applied.

FIG. 2 is a perspective view showing a configuration example of an external appearance of a rectangular waveguide manufactured according to the present invention.

FIG. 3 is a conceptual view showing a layout relationship between a waveguide side cavity of a mold and a cooling path in a plan view.

FIG. 4 is a sectional view conceptually showing in simplified form an example of a mold for producing a waveguide.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a diagram showing a conventional technique.

[Explanation of symbols]

1 reflector, 2 phase shifter, 3 duplexer, 4 waveguide / coaxial converter, 10 waveguide, 10a waveguide block, 1
0b Waveguide block, 11 Waveguide groove, 20 cavity, 20a Waveguide side cavity, 30 Cooling hole (cooling path), 40 mold, 41 mold, 42 Gate (resin injection port).

Continued front page    (72) Inventor Naoshi Yamada             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Hideki Asao             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Kazuhisa Hemi             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 5J014 DA05

Claims (3)

[Claims] 1. A method for manufacturing a resin waveguide, in which a thermoplastic resin is resin-molded to form a waveguide having a waveguide therein, and a mold for forming a waveguide side inside the waveguide. On the side, a cooling path through which the cooling medium flows is arranged so as to extend along the waveguide, and a resin injection port is arranged on the mold side for forming the surface side of the waveguide to perform resin molding. A method of manufacturing a resin waveguide, which comprises forming a resin waveguide. 2. The resin waveguide according to claim 1, wherein the waveguide is formed by joining a pair of waveguide blocks in which a groove for a waveguide is formed. Production method. 3. A resin waveguide manufactured by using the manufacturing method according to claim 1.