JP2009152744A - Primary radiator, radio wave receiving converter with the same, and antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and inexpensive primary radiator excellent in waterproof performance, to provide a radio wave receiving converter with the primary radiator, and to provide an antenna. <P>SOLUTION: A cylindrical fitting part 1b is integrally formed through a step part on the outer side at the distal end of the cone pat 1a of the primary radiator 1, a distal end rib 1c is integrally formed at the distal end of the cylindrical fitting part 1b, and an outer peripheral wall 2b is integrally formed from the ceiling part of a waterproof cover 2. The outer peripheral wall 2b is fitted to the outer side of the cylindrical fitting part 1b, and a pawl part 2d projected on the inner side of the outer peripheral wall 2b is engaged with the step part 1e. Then, the primary radiator includes: a ring-like rib integrally formed concentrically to the outer peripheral wall from the inner surface of the ceiling part of the waterproof cover 2; and packing 6 comprising a rubber-based material, which is inserted between the distal end rib of a feed horn and the ceiling part 2a between the outer peripheral wall of the waterproof cover and the ring-like rib. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a primary radiator for satellite reception suitable for receiving a radio wave transmitted from an artificial satellite using a parabolic reflector, a radio wave reception converter and an antenna including the primary radiator.

  First, a first conventional example of a temporary radiator related to the present invention will be described with reference to FIG. Usually, a satellite dish receiving parabolic antenna is used outdoors, so the primary radiator to be mounted also needs to be waterproof. A flat surface portion 12c is provided in the outer peripheral portion of the primary radiator 12 slightly from the tip rib portion 12a, and a packing 14 such as an O-ring made of a rubber-based material is inserted therein. The outer peripheral portion of the primary radiator 12 is covered with a waterproof cover 13 made of a plastic material for allowing radio waves to pass between the step plane 13 a provided on the inside and the step plane 12 c of the primary radiator 12. The packing 14 is pressed.

  Further, as a packing pressing means, a claw portion 13b is provided at the rear portion of the waterproof cover 13. Thereby, the claw part 13b of the waterproof cover 13 is firmly fitted to the claw mating surface 12b provided on the outer rear side of the step surface 12c of the primary radiator 12, and the packing is compressed. With this structure, the waterproof performance of the waterproof cover 13 and the primary radiator 12 can be maintained.

  Next, a second conventional example of a primary radiator will be described with reference to FIG. In this conventional example, a groove 15b is provided in the outer peripheral portion of the primary radiator 15, and an O-ring 17 made of a rubber-based material is fitted into the groove. In that state, the waterproof cover 16 is covered. The waterproof cover 16 is fixed by being fitted to a claw portion 16 b provided at the rear portion and a step portion 15 c behind the groove portion of the primary radiator 15. The O-ring is compressed between the inner peripheral surface of the waterproof cover 16 and the groove cylindrical surface of the primary radiator, so that waterproof performance is maintained.

Moreover, there exists a thing of patent document 1 as another conventional example of a primary radiator. The technique described in Patent Document 1 is as follows. A feed dome (cover) having a cylindrical portion is screwed around the outer wall and the periphery in the vicinity of the horn antenna opening, and the joint is fixed and sealed with an adhesive. Another conventional example of the primary radiator is disclosed in Patent Document 2. The technique described in Patent Document 2 is as follows. A mounting groove is provided in a part of the opening side of the tube wall that forms the opening of the horn antenna, and a post is provided in a part of the feed dome (cover). The feed dome post is inserted into the mounting groove, and the feed dome is rotated so as to cover the horn antenna opening.
Japanese Utility Model Publication No. 60-172404 Japanese Utility Model Sho 61-035405

  However, the conventional primary radiators described above have the following problems. In the first conventional example shown in FIG. 10, since the O-ring fitting surface is provided outside the outer periphery of the primary radiator, the outer shape becomes large, the material cost of parts increases, and the cost increases. Further, in the second conventional example shown in FIG. 11, the O-ring mating surface is provided in the outer peripheral groove portion, so that the outer shape can be made smaller than in the first conventional example. However, in order to press the O-ring against the cylindrical surface, it is necessary to increase the strength by thickening the outer periphery of the waterproof cover. That is, if the thickness of the outer periphery of the waterproof cover is not sufficient, the O-ring will lose the rubber elasticity, and the O-ring cannot be pressed. Therefore, since it is necessary to thicken the outer periphery of the waterproof cover, the material cost of the waterproof cover becomes expensive.

  In general, the primary radiator is often manufactured by die casting, and a die-matching portion can be formed in the O-ring fitting groove due to the die-cutting relationship. Since burrs are generated at the mating portion, it is necessary to perform machining such as a lathe to remove the burrs, resulting in high costs. Further, when the waterproof cap is fitted, the claw portion may be caught by the O-ring and damage the O-ring. Or the O-ring is hooked and the O-ring is twisted, resulting in poor waterproofing. In addition, in the techniques of Patent Documents 1 and 2, the outer shape becomes large.

  An object of the present invention is to solve the above problems, to provide a primary radiator that is small, inexpensive, and has good prevention performance, and to provide a radio wave receiving converter and an antenna equipped with such a primary radiator. To do.

  In one aspect of the primary radiator of the present invention that solves the above problems, a cylindrical fitting portion is integrally formed at the tip of a cone portion so as to have a stepped portion on the outer side at the boundary with the cone portion. A feed horn, a tip rib integrally formed at the tip of the cylindrical fitting portion, a ceiling portion and an outer peripheral wall are integrally formed, the outer peripheral wall is fitted outside the fitting portion, and the inner side of the outer peripheral wall And a ring formed integrally with the ceiling portion and the outer peripheral wall, concentrically with the outer peripheral wall, on the inner surface of the ceiling portion of the waterproof cover. And a rib. A feature of the present invention is that a packing made of a rubber-based material is inserted into a ring-shaped region surrounded by the tip rib of the feed horn, the outer peripheral wall and the ceiling of the waterproof cover, and the ring-shaped rib. Is in heaven.

  As a rubber material packing material, a liquid sealing material having adhesive strength is injected and hardened, an O-ring having a circular cross section, a rectangular cross section, or a triangular cross section is used. Can do.

  In another aspect, the primary radiator of the present invention is a U-shape fitted into the tip rib between the tip rib of the feed horn and the outer peripheral wall and the ceiling portion of the waterproof cover. Includes a packing made of a rubber-based material with a mold section. In still another aspect, a rubber having a U-shaped cross section is provided between an inner surface of the tip rib of the feed horn, a stepped portion following the inner surface of the tip rib, and a ring-shaped rib of the waterproof cover. A packing made of a system material is inserted so as to fit into the ring-shaped rib. Further, in still another aspect, from between the ceiling portion of the waterproof cover and the tip rib of the feed horn, an inner surface of the tip rib and a stepped portion subsequent thereto, and the ring-shaped rib of the waterproof cover, A packing made of a rubber-based material is inserted so as to fit into the ring-shaped rib.

  The present invention includes a radio wave receiving converter including the above-described primary radiator and an antenna including the radio wave receiving converter.

As described above, according to the present invention, it is possible to provide a primary radiator that is small, inexpensive, and has good prevention performance, and it is possible to provide a radio wave receiving converter and an antenna equipped with the primary radiator.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a primary radiator according to Embodiment 1 of the present invention, where (a) shows only the waterproof cover, and (b) shows a cross section of the entire primary radiator. In the temporary radiator of the present embodiment, a cylindrical fitting portion 1b is integrally formed on the tip of the cone portion 1a of the feed horn 1 via a step portion 1d on the outside, and a tip rib is provided on the tip of the cylindrical fitting portion 1b. 1c is integrally formed. A cylindrical outer peripheral wall 2b is integrally formed from the circular ceiling portion 2a of the waterproof cover 2. Further, the outer peripheral wall 2b is fitted to the outside of the fitting portion 1b, and a claw portion 2d protruding from the inner side of the outer peripheral wall 2b is engaged with the step portion 1d. Here, the ring-shaped rib 2c is integrally formed from the inner surface of the circular ceiling portion 2a of the waterproof cover 2 to the cylindrical outer peripheral wall 2b. A packing is inserted between the tip rib 1c of the feed horn 1 and the ceiling portion 2a between the cylindrical outer peripheral wall 2b of the waterproof cover 2 and the ring-shaped rib 2c.

  As described above, the ring-shaped rib 2c is provided on the inner surface of the ceiling portion 2a of the waterproof cover 2 that is mainly manufactured by injection molding using a plastic material such as polypropylene or ABS resin, and is bonded between the outer peripheral wall 2b and the rib 2c. A powerful liquid sealing material 3 is injected. Thereafter, it is covered with a primary radiator 1 made of a metal material and mainly made of aluminum die casting or zinc die casting. The liquid sealing material 3 adheres and fixes the outer peripheral surface of the rib 2c and the inner surface of the tip rib 1c of the primary radiator. The liquid sealing material 3 is also bonded and fixed to the tip surface of the tip rib 1c of the primary radiator and the inner surface of the ceiling portion 2a between the outer peripheral wall 2b and the rib 2c of the waterproof cover. The waterproof cover 2 is fixed by fitting the claw portion 2d to a step portion 1d provided on the outer peripheral portion of the primary radiator. By having such a structure, according to the primary radiator of the first embodiment, the waterproof function of the opening surface of the primary radiator can be maintained, and the outer shape can be made smaller than the conventional example.

  Next, one modification of Embodiment 1 of the present invention will be described with reference to FIG. In this modification, an O-ring 4 made of a rubber material is used instead of the liquid sealing material 3 in the embodiment shown in FIG. As described above, by using the O-ring 4, it is not necessary to take time for curing when the liquid sealing material is used, and therefore, the working time can be shortened.

  Next, another modification of the first embodiment of the present invention will be described with reference to FIG. In this modification, a ring packing 5 having a square cross section is used instead of the O-ring 4 in the modification shown in FIG. Unlike the O-ring, the ring packing 5 having a square cross section can be manufactured by stamping a rubber plate, so that there is an advantage that it is not necessary to use an expensive mold.

  Next, still another modification of the first embodiment of the present invention will be described with reference to FIG. In this modification, a ring packing 6 having a triangular cross-section is used instead of the O-ring 4 in the modification shown in FIG. When the cross section is triangular, as shown in FIG. 4, deformation when the rubber is compressed is also pressed in the circumferential direction, so that the contact area of the rubber increases and the waterproof performance is stabilized.

(Embodiment 2)
Next, a primary radiator according to the second embodiment of the present invention will be described with reference to FIG. In the primary radiator of the second embodiment, the tip rib 1c is integrally formed on the outer side of the cylindrical fitting portion 1b of the feed horn 1 via the step portion 1e on the outer side. A rubber packing 7 having a U-shaped cross section is inserted between the tip rib 1 c of the feed horn 1 and the cylindrical outer peripheral wall 2 b and the ceiling portion 2 a of the waterproof cover 2. Thus, in this embodiment, the groove portion of the rubber ring packing 7 having a U-shaped cross section is fitted into and fixed to the metal rib 1c over the entire circumference of the most distal portion of the feed horn 1 of the primary radiator, By covering with the waterproof cover 2 from above, airtightness is given between the inner surface of the waterproof cover ceiling portion 2a and the end surface of the rib 1a.

  Next, one modification of Embodiment 2 of the present invention will be described with reference to FIG. In this modified example, a tip rib 1c is integrally formed on the inside of the feed horn 1 on the tip side of the cylindrical fitting portion 1b via a step portion 1f. A packing 8 is inserted between the tip rib 1c of the feed horn 1 and the ceiling portion 2a between the cylindrical outer peripheral wall 2b of the waterproof cover 2 and the ring-shaped rib 2c.

In this way, the step portion 1f (step flat portion) is provided on the inner side from the end face of the rib 1a at the tip of the opening surface of the primary radiator 1, and the step flat portion and the ring-shaped rib 2a of the waterproof cover 2 are provided. Between
The groove portion of the rubber ring packing 8 having a U-shaped cross section is fitted and fixed. And the waterproof performance is hold | maintained between the level | step difference flat part 1f of a primary radiator, and the front end surface of the ring-shaped rib 2c of a waterproof cover. Since the tip of the primary radiator is generally likely to have a dent or the like during the manufacturing process, the closer the seal structure is to the tip of the primary radiator, the higher the possibility that a waterproof failure will occur. For this reason, as in this modification, the waterproof function is maintained by the step flat portion 1f that enters one step inside, so that a waterproof failure is unlikely to occur, and thus the yield at the time of manufacturing the primary radiator is improved.

  Next, another modification of the second embodiment of the present invention will be described with reference to FIG. In this modification, the outer peripheral portion of the ring packing 9 extends to the inner surface of the ceiling portion 2a between the rib 2c of the waterproof cover 2 and the outer peripheral wall 2b. Thus, by providing waterproof performance even between the end surfaces of the tip ribs 1c of the feed horn 1, the contact area of the packing is increased and the waterproof performance is further stabilized.

(Application example of the present invention)
The primary radiator 12 shown in each of the above embodiments of the present invention and the modifications thereof can be mounted on a radio wave receiving converter 10 as shown in FIG. Such a primary radiator 12 and radio wave receiving converter 10 can be combined with the parabolic antenna 11 to form a parabolic antenna device as shown in FIG. In the parabolic antenna device shown in FIG. 9, the radio waves reflected by the parabolic antenna 11 are collected by the primary radiator 12 and sent to the converter 10. The converter 10 amplifies the radio wave, frequency converts it into a signal, outputs the signal from the output terminal 10a, and sends it to the receiver or TV via the coaxial cable 14.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

(A) is sectional drawing which shows the waterproof cover of Embodiment 1 of this invention, (b) is sectional drawing of the primary radiator of the Embodiment 1. FIG. (A) is sectional drawing which shows the waterproof cover in the modification of Embodiment 1 of this invention, (b) is sectional drawing of the primary radiator of the modification. (A) is sectional drawing which shows the waterproof cover in the other modification of Embodiment 1 of this invention, (b) is sectional drawing of the primary radiator of the modification. (A) is sectional drawing which shows the waterproof cover in the further another modification of Embodiment 1 of this invention, (b) is sectional drawing of the primary radiator of the modification. (A) is sectional drawing which shows the waterproof cover of Embodiment 2 of this invention, (b) is sectional drawing of the primary radiator of the Embodiment 2. FIG. Sectional drawing which shows the waterproof cover in one modification of Embodiment 2 of this invention, (b) is sectional drawing of the primary radiator of the modification. (A) is sectional drawing which shows the waterproof cover of Embodiment 3 of this invention, (b) is sectional drawing of the primary radiator of the Embodiment 3. FIG. It is the schematic of the converter for radio wave reception using the primary radiator of this invention. It is the schematic of the parabolic antenna carrying the converter for radio wave reception using the primary radiator of the present invention. (A) is sectional drawing which shows the waterproof cover of the primary radiator of the 1st prior art example, (b) is sectional drawing which shows the primary radiator of the prior art example. (A) is sectional drawing which shows the waterproof cover of the primary radiator of the 2nd prior art example, (b) is sectional drawing which shows assembly positive of the primary radiator of the prior art example, (c) is the prior art example It is sectional drawing which shows the assembly state of the primary radiator.

Explanation of symbols

  1 primary radiator, 1a cone part, 1b cylindrical fitting part, 1c tip rib, 1d step part, 1e step part, 1f step part, 2 waterproof cover, 2a ceiling part, 2b outer peripheral wall, 2c ring-shaped rib, 2d Claw part, 3 Liquid sealing material, 4 O ring for rubber material, 5 Ring packing with rectangular cross section of rubber material, 6 Ring packing with triangular cross section of rubber material, 7 Cross sectional shape of rubber material Ring packing of mold, 8 Rubber-shaped cross section of U-shaped ring packing, 9 Ring packing of special cross-section of rubber-based material, 10 Radio wave receiving converter body, 10b Coaxial cable, 11 Parabolic antenna.

Claims (10)

A feed horn in which a cylindrical fitting portion is integrally formed at the tip of the cone portion so as to have a stepped portion on the outside at the boundary with the cone portion;
A tip rib integrally formed at the tip of the cylindrical fitting portion;
A waterproof cover in which a ceiling part and an outer peripheral wall are integrally formed, the outer peripheral wall is fitted to the outside of the fitting part, and a claw part protruding from the inner side of the outer peripheral wall is engaged with the step part;
On the inner surface of the ceiling portion of the waterproof cover, provided with a ring-shaped rib formed integrally with the ceiling portion and the outer peripheral wall, concentrically with the outer peripheral wall,
A primary radiation in which a packing made of a rubber-based material is inserted into a ring-shaped region surrounded by the tip rib of the feed horn, the outer peripheral wall and the ceiling of the waterproof cover, and the ring-shaped rib. vessel.   The primary radiator according to claim 1, wherein the rubber material packing material is obtained by injecting and curing a liquid sealing material having adhesive force.   The primary radiator according to claim 1, wherein the rubber-based material packing is an O-ring having a circular cross-sectional shape.   The primary radiator according to claim 1, wherein the rubber-based material packing has a square cross-sectional shape.   The primary radiator according to claim 1, wherein the packing of the rubber-based material has a triangular cross-sectional shape. A feed horn in which a cylindrical fitting portion is integrally formed at the tip of the cone portion so as to have a stepped portion on the outside at the boundary with the cone portion;
A tip rib integrally formed at the tip of the cylindrical fitting portion;
A ceiling cover and an outer peripheral wall are integrally formed, the outer peripheral wall is fitted to the outside of the fitting portion, and a claw portion protruding from the inner side of the outer peripheral wall is engaged with the stepped portion. ,
Primary radiation including a packing made of a rubber-based material having a U-shaped cross section, fitted into the tip rib, between the tip rib of the feed horn and the outer peripheral wall and the ceiling of the waterproof cover. vessel. A feed horn in which a cylindrical fitting portion is integrally formed at the tip of the cone portion so as to have a stepped portion on the outside at the boundary with the cone portion;
A tip rib integrally formed at the tip of the cylindrical fitting portion;
A waterproof cover in which a ceiling part and an outer peripheral wall are integrally formed, the outer peripheral wall is fitted to the outside of the fitting part, and a claw part protruding from the inner side of the outer peripheral wall is engaged with the step part;
On the inner surface of the ceiling portion of the waterproof cover, provided with a ring-shaped rib formed integrally with the ceiling portion and the outer peripheral wall, concentrically with the outer peripheral wall,
Between the inner surface of the tip rib of the feed horn, the stepped portion following the inner surface of the tip rib, and the ring-shaped rib of the waterproof cover, a packing made of a rubber-based material having a U-shaped cross section is provided. Primary radiator inserted to mate with a rib. A feed horn in which a cylindrical fitting portion is integrally formed at the tip of the cone portion so as to have a stepped portion on the outside at the boundary with the cone portion;
A tip rib integrally formed at the tip of the cylindrical fitting portion;
A waterproof cover in which a ceiling part and an outer peripheral wall are integrally formed, the outer peripheral wall is fitted to the outside of the fitting part, and a claw part protruding from the inner side of the outer peripheral wall is engaged with the step part;
On the inner surface of the ceiling portion of the waterproof cover, provided with a ring-shaped rib formed integrally with the ceiling portion and the outer peripheral wall, concentrically with the outer peripheral wall,
In a region extending between the ceiling portion of the waterproof cover and the tip rib of the feed horn, and between the inner surface of the tip rib and a stepped portion that follows, and the ring-shaped rib of the waterproof cover, a rubber system A primary radiator in which a packing made of a material is inserted so as to fit into the ring-shaped rib.   A radio wave receiving converter comprising the primary radiator according to any one of claims 1 to 8.   An antenna comprising the radio wave receiving converter according to claim 9.

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