JPH01144703A - Manufacture of parabolic antenna - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing a parabolic antenna.

[Prior Art and its Problems] Conventionally, the 88 (lffiff method) system uses many types of antennas, such as a parabolic antenna, a slot antenna, and a strip antenna. Among these antennas, parabolic antennas are the most advanced in practical application.

Therefore, the production of parabolic antennas begins with modified polyhenylene oxide (modified PP0), acrylonitrile,
Butadiene styrene (ABS), fiber reinforced resin (FR)
A substantially bowl-shaped antenna body is made by injection molding or strufture forming (SF molding) of plastic such as P). Next, separate from the antenna body, for example, the thickness is 20 mm.
A C1m aluminum sheet is press-molded using a mold to create a radio wave reflector shaped to fit into the concave surface of the antenna body.

Thereafter, this radio wave reflector is integrally attached to the concave surface of the antenna body via an adhesive. After this, a weather-resistant paint is applied to the surface of the radio wave reflector, and electrical accessories such as a converter are attached to obtain a parabolic antenna.

In such a conventional parabolic antenna, manufacturing a mold for making a radio wave reflector requires a lot of cost, and the radio wave reflector itself requires processing, resulting in poor workability. Furthermore, since the work of applying weather-resistant paint to the surface of the radio wave reflector is performed one by one, work efficiency is extremely poor. Furthermore, if the processing accuracy of the radio wave reflector is poor, the edges of the radio wave reflector protrude from the antenna body, causing corrosion of the radio wave reflector, resulting in a decrease in quality and reliability.

The present invention has been made in view of these points, and provides a method for manufacturing a parabolic antenna that is high in quality, excellent in reliability, inexpensive, and easy to mass produce.

[Means for Solving the Problems] The present invention provides a metal mold having a hollow portion having approximately the same shape as the outer shape of the antenna main body, and a radio wave reflecting layer is provided in the hollow portion of the mold, in the portion facing the concave portion of the antenna main body. A parabola characterized by comprising the step of inserting a thin film having a weather-resistant film layer thereon, and then injecting a predetermined resin into the hollow part to serve the antenna body to which the thin film is attached. This is a method for manufacturing an antenna.

Here, it is preferable to provide a thermoplastic resin layer made of polyvinyl chloride, polyethylene, or polypropylene as required below the radio wave reflecting layer constituting the thin film body.

Further, as the radio wave reflecting layer, it is preferable to use, for example, an aluminum foil having a thickness of 3 to 75 μm.

In addition, as a weather-resistant film layer, polyvinyl fluoride (
PVF), polynylidene fluoride (PVDF), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (P
It is preferable to use a fluorine-based film made of either TFE) or perfluoroalkyl vinyl ether copolymer (PFA) or a polyethylene terephthalate film. Moreover, the thickness of the weather-resistant film layer is 9 to 50
It is preferable to set it appropriately in μm.

[Function] According to the method for manufacturing a parabolic antenna according to the present invention,
A mold having a hollow part of approximately the same shape as the antenna main body is prepared, a thin film material is inserted into the hollow part facing the concave part of the antenna main body, and a predetermined resin is injected into the thin film material. Since the antenna body is obtained with the antenna attached, high-quality and highly reliable parabolic antennas can be easily and inexpensively mass-produced.

[Examples] Examples of the present invention will be described below with reference to the drawings.

First, as shown in FIGS. 1 and 2, a wire with a short diameter of 450 mm, which has approximately the same external shape as the antenna body to be manufactured.
, almost bowl-shaped hollow part 1 with a major axis of 550 mm and a depth of 50 mm.
A mold 2 having the following is prepared.

Next, the thin film body 3 in the form of a roll is intermittently sent and inserted into the part of the hollow part 1 facing the concave surface of the antenna main body.As shown in FIG. Thermoplastic resin layer 5 made of polyvinyl chloride with a diameter of about 150 μm
On top, a radio wave reflection 1i made of urethane adhesive (39/m2dry) and aluminum foil with a thickness of about 40 μm.
6. A urethane adhesive (397 ml dry) and a weather-resistant film layer 7 made of polyvinylidene fluoride with a thickness of about 40 μm are sequentially applied.

Next, for example, ABSI! An antenna main body 4 to which a thin film body 3 is attached is obtained by injecting fat.

After that, the antenna body 4 is removed from the mold, and this antenna body 4 is
The N lobe 3 protruding from the periphery is cut and trimmed, and attached electrical equipment such as a converter (not shown) is attached to it to obtain a parabolic antenna.

[Effect of the invention] As described above, according to this method of manufacturing a parabolic antenna,
A mold for making the radio wave reflective layer is not required, and the cost thereof can be eliminated. Further, workability can be improved without requiring a processing step for the radio wave reflective layer itself. Furthermore, there is no need to apply weather-resistant paint to the surface of the radio wave reflective layer one by one, and there is no need to trim the edges of the radio wave reflective layer, so work efficiency can be significantly improved. Moreover, since the edge of the radio wave reflective layer does not protrude from the antenna body, corrosion of the radio wave reflective layer can be prevented and the quality and reliability of the antenna can be improved. As a result, high-quality, highly reliable parabolic antennas can be easily and inexpensively mass-produced.

As explained above, according to the method for manufacturing a parabolic antenna according to the present invention, it is possible to provide a parabolic antenna that is high in quality, excellent in reliability, inexpensive, and easy to mass produce.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the same process, and FIG. 3 is a sectional view of a main part of a parabolic antenna manufactured according to the present invention. DESCRIPTION OF SYMBOLS 1...Hollow part, 2...Mold, 3...Thin body, 4...Antenna body. Applicant's agent Patent attorney Takehiko Suzue

Claims (5)

[Claims] (1) A thin sheet formed by providing a weather-resistant film layer on a radio wave reflecting layer in a part of the hollow part of the mold having a hollow part having approximately the same shape as the external shape of the antenna main body, and facing the concave part of the antenna main body. A method for manufacturing a parabolic antenna, comprising the step of injecting a predetermined resin into the hollow portion after inserting the body to obtain the antenna body to which the thin film body is attached. (2) The lower layer of the thin radio wave reflective layer is polyvinyl chloride,
2. The method of manufacturing a parabolic antenna according to claim 1, further comprising a thermoplastic resin layer made of either polyethylene or polypropylene. (3) The method for manufacturing a parabolic antenna according to claim 1 or 2, wherein the radio wave reflecting layer is an aluminum foil having a thickness of 3 to 75 μm. (4) The weather-resistant film layer is made of polyvinyl fluoride (PVF).
), polyvinylidene fluoride (PVDF), tetrafluoroethylene-hexafluoropropylene copolymer (FE
P), polytetrafluoroethylene (PTFE),
Perfluoroalkyl vinyl ether copolymer (PF
The method for manufacturing a parabolic antenna according to claim 1, wherein the parabolic antenna is a fluorine-based film or a polyethylene terephthalate film made of any one of A). (5) The method for manufacturing a parabolic antenna according to claim 4, wherein the weather-resistant film layer has a thickness of 9 to 50 μm.