JPH09321515A - Antenna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent rust from being produced on antenna elements by providing a water-proof plane with an outer shape equal to or larger than a size of a drainage hole to a position opposed to the drainage hole inside a cover so as to prevent water splash from intruding in the inside. SOLUTION: A cover 3 configures a package to protect antenna elements 4, 4, and a circular drainage hole 3a and a torus rib 3b which are communicated between the inside and the outside in common use for vents for dewing prevention and drainage for condensed water are provided to the center of a dome shaped bottom side. A thermoplastic resin material made water-proof plate 14 with a disk like outer shape equal to or larger than the drainage hole 3a is fitted to a position inside the cover 3 opposed to the drainage hole 3a. The water-proof plate 14 has four legs at a side of the disk shaped water-proof part facing the cover 3 and the tips of the legs are fixed to the bottom face of the cover 3 while being positioned and adhered by the rib 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device installed and used on an indoor ceiling or wall surface.

[0002]

2. Description of the Related Art As an antenna device used indoors for a PHS (Personal Handyphone), which has recently received attention, a device having a structure shown in FIG. 5 which is mounted on a ceiling of a building or an underground mall has been devised. This antenna device was devised by the present applicant and is applied for as Japanese Patent Application No. 7-132392.

This antenna device has a base 2 having a mounting means for mounting on a construction surface such as a ceiling, and an engaging means for engaging with the base 2, and a through-hole for accommodating one to a plurality of antenna elements 4, 4. Antenna main body 1 having a cover 3 having a drainage hole 3a that also serves as a pore to form a storage body
And is provided. Then, the antenna main body 1 is attached by engaging with a base 2 attached to the ceiling by a sandwiching metal fitting (not shown) which is an attaching means.

Then, the drainage hole 3a of the above antenna device.
Has a function of discharging water or dew condensation water that has intruded into the outside, but at the same time, a ventilation hole for preventing dew condensation is formed so that the antenna element does not rust due to dew condensation inside the antenna body 1 and the characteristics do not change. It also serves as a combination.

[0005]

By the way, in an underground mall where the above antenna device is installed, the ceiling surface is regularly sprinkled to clean and remove dust adhesion. Therefore, the splashes at the time of water sprinkling may invade from the drainage holes 3a and stay there, impairing the function of the antenna element. Further, it is conceivable to separately provide a ventilation hole for draining water to retain the sprinkling water, but increasing the number of openings conversely promotes rusting of the antenna element 4 due to inflow of moisture. There was such a problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an antenna device capable of preventing water spray from entering the inside and preventing rusting of an antenna element. is there.

[0007]

In order to achieve the above object, the antenna device according to claim 1 is a drainage which is attached to a construction surface such as a ceiling and also serves as a ventilation hole for accommodating one or a plurality of antenna elements. In an antenna device having a housing having a hole, at a position facing each other inside the drain hole,
It is assumed that the waterproof plate has an outer shape that is equal to or larger than the drain hole. As a result, a waterproof plate having an outer shape that is equal to or larger than the drain hole is installed inside the drain hole at a position facing each other.

In the antenna device according to the second aspect, the waterproof plate according to the first aspect is fixed to the housing. As a result, the waterproof plate is fixed to the container.

An antenna device according to a third aspect of the invention is an antenna device having a housing attached to a construction surface such as a ceiling and having a drainage hole that also functions as a ventilation hole for housing one or a plurality of antenna elements. The drain hole has a lid that can be closed so as to prevent the splash of water from the outside from entering the inside. As a result, the drain hole can be closed by the lid so as to prevent intrusion of water spray from the outside.

Further, in the antenna device according to a fourth aspect, the lid body according to the third aspect has a lid portion having an outer shape larger than the drainage hole, and a locking portion for locking the lid portion to the storage body. However, the lid is arranged at a position facing the drainage hole outside the storage body and is locked by the locking portion so that the drainage hole can be opened and closed. As a result, the drain hole is closed at the position facing the drain hole outside the storage body by the lid portion of the lid body having an outer shape larger than that of the drain hole, which is locked to open and close the drain hole.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The antenna device of the present invention will be described below.
The first embodiment will be described with reference to FIGS. 1 and 2, and the second embodiment will be described with reference to FIGS. 3 and 4.

[First Embodiment] FIG. 1 is a sectional view of an antenna device according to a first embodiment. 2 is a perspective view of a waterproof plate which is a main part of the antenna device shown in FIG.
(A) is an exploded view, (b) is an assembly state diagram.

This indoor installation type antenna device is a PHS.
It is connected to the base station of (1) and transmits / receives a radio signal between the base station and the PHS telephone, and is composed of an antenna main body 1 and a mounting base 2. The antenna body 1 comprises a housing 3 made of a thermoplastic resin material having a dome shape, and a disk-shaped ground plate 5 made of a conductive metal material such as a stainless steel material, and a pair of antenna elements 4 inside.
4 has a structure for accommodating 4 and is detachably attached to the base 2.

The antenna elements 4 and 4 are disk-shaped radiation plates 4
a, a common ground plate 5, a ground plate 5 and radiation plates 4a, 4a
Mounting plates 7, 7 for supporting and fixing the radiation plates 4a, 4a to the ground plate 5 also serving as short-circuit pins for connecting to
a and 4a, the coaxial cable connectors 6 and 6 which are transmission lines provided on the back surface of the ground plate 5 and the radiation plates 4a and 4a.
Power supply lines 4b, 4 connecting the power supply point of a and the connectors 6, 6
Each of the antenna elements 4 and 4 constitutes a so-called top loading antenna, and a pair constitutes a space diversity type antenna device.

Connectors 6, 6 are fixed to the upper surfaces of both sides of the center of the ground plate 5 with fixing screws 8, 8 respectively, and the mounting screws 7, 7 are attached from the vicinity of the connectors 6, 6 to the lower surface side of the ground plate 5. To the corresponding radiating plates 4a and 4a through the cylindrical spacers 9 and 9 made of metal such as brass. The plates 4a and 4a are supported in parallel from the lower surface of the ground plate 5 by spacers 9 and 9 at a fixed distance. With this mounting screw 7 and spacers 9, 9,
The ground plate 5 and the radiation plate 4a are short-circuited to have the same potential.
Further, the feeding points located at positions deviated from the centers of the radiating plates 4a, 4a and the connectors 6, 6 arranged corresponding to the feeding points are composed of contacts protruding from the lower surface side of the ground plate 5 from the connectors 6, 6. The power supply lines 4b and 4b are connected.
Protective tools 11, 11 for protecting the power supply lines 4b, 4b are inserted in the power supply lines 4b, 4b. The protectors 11 and 11 are formed to have a size slightly shorter than the distance between the radiation plates 4a and 4a and the ground plate 5, and extend from the connectors 6 and 6, respectively.

On both sides of the upper surface of the grounding plate 5 in the direction orthogonal to the line connecting the connectors 6 and 6, hook metal fittings 12 for detachably mounting the antenna body 1 on the base 2 are attached at two positions. These hook metal fittings 12 each have a strip-shaped base portion 12a and a hook claw portion 12b formed by bending the base portion 12a into a substantially L shape at one end side.
Since both ends of 2a are fixed to the ground plate 5 by the fixing screws 12c, resin is coated and holes for inserting the fixing screws 12c in consideration of waterproofing are formed. That is, since these hook metal fittings 12 are attached to the ground plate 5 by the fixing screws 12c, the holes of the hook metal fittings 12 are closed by the resin coated on the fixing screws 12c, so that waterproofing can be achieved. Further, the hook claw portion 12b of the hook metal 12
The tip of is bent on the side opposite to the base portion 12a so that it can be easily engaged with an engagement piece 16 of the base 2 described later.

The cover 3 constitutes a housing for protecting the antenna elements 4 and 4. The cover 3 has, for example, a circle in the center of the dome-shaped bottom surface, which serves both as ventilation for communicating with the inside and outside and for draining the condensed water. The drainage hole 3a and the ring-shaped rib 3b are provided. Then, at a position facing the drainage hole 3a inside the cover 3, a waterproof plate 14 made of a thermoplastic resin material having a disk-shaped outer shape equal to or larger than the drainage hole 3a.
Is stuck. As shown in FIG. 2, the waterproof plate 14 has leg portions 14b at four positions on the side facing the cover 3 which is the lower surface of the disc-shaped waterproof portion 14a, and the tip ends of the leg portions 14b are covered with the cover 3. The ribs 3b are positioned on the bottom surface and fixed by adhesion or the like.

Thus, the ground plate 5 to which the constituent members of the antenna elements 4 and 4 are attached is placed in the upper opening of the cover 3 so that the antenna elements 4 and 4 are on the lower surface side (that is, the front surface side). By mounting and fixing with fixing screws 13 and 13, the antenna body 1 in which the antenna elements 4 and 4 are housed in the cover 3 is configured.

The base 2 is made of a synthetic resin material and is made of a peripheral wall 2.
The antenna body 1 is formed in a disk shape having a, and the antenna body 1 is attached to the inside of the peripheral wall 2a such that the peripheral edge of the upper portion of the cover 3 is fitted. A plate-shaped engaging piece 16 that engages with a hooking claw portion 12b of a hooking metal 12 fixed to the ground plate 5 of the antenna body 1 is provided on the bottom of the inner wall 2a of the base 2.
It is fixed by screws at two positions corresponding to the hook metal 12. These engaging pieces 16 are used for the antenna body 1
Is fixed so as to straddle each arcuate guide 2b formed on the bottom surface of the base 2 facing the ground plate 5. Then, by fitting the peripheral edge of the cover 3 of the antenna main body 1 into the peripheral wall 2a of the base 2 and rotating the cover 3 in a predetermined direction, the hook metal fittings of the antenna main body 1 are guided along the guides 2b of the base 2. 12 is moved, and the hooking claw portions 12b of the hooking metal fitting 12 can be hooked and engaged with the engaging pieces 16, respectively.

Further, the bottom of the base 2 is provided with notches 2c, 2c for leading out an arc-shaped coaxial cable, and also functions as an escape hole for the connectors 6, 6 when the antenna body 1 is attached to the base 2. . Further, the pitch (8 mm) of the mounting screw holes of the ready-made switch box (not shown)
3.5 mm), a pair of screw insertion holes, a screw insertion hole for directly inserting and fixing wood screws or tapping screws on the installation surface, or a fixing metal fitting mounting portion (neither is shown) is provided. It can be attached directly to the ceiling surface or wall surface, or can be attached using a ready-made switch box.

According to the antenna device of the above-described embodiment, the waterproof plate 14 having an outer shape equal to or larger than that of the drainage hole 3a is installed at the opposite position inside the drainage hole 3a, so that ventilation can be performed as usual. As a result, dew condensation is prevented, and at the same time, water spray splashes against the waterproof plate 14 and can be prevented from entering the inside. The ribs 3b also prevent the sprayed water droplets hitting the waterproof plate 14 from spreading inside the cover 3. Further, the cover 3 in which the waterproof plate 14 constitutes a storage body
Therefore, the waterproof plate 14 can be installed at a position facing the drain hole regardless of the internal structure or size of the housing.

[Second Embodiment] FIG. 3 is a partial view of a drain hole which is a main part of an antenna device according to a second embodiment.
(A) shows a normal state, (b) shows a closed state. FIG.
It is a partial perspective view of the drainage hole which is the principal part of the antenna device shown in FIG. 3, (a) is an exploded view, (b) is an assembly state figure. This antenna device is provided with a drainage hole 3 which also serves as a ventilation hole of the cover 3.
Only the configuration around a is different from that of the first embodiment, and the other components are the same as those of the first embodiment.

The drain hole 3a of the cover 3 has a lid 15 which can be closed so as to prevent the splash of water from the outside from entering the inside. 3 and 4
In the example shown in (1), the lid body 15 is made of a thermoplastic resin material and has a circular lid portion 15a having an outer shape larger than the drainage hole 3a, and a locking portion 15b for locking the lid portion 15a to the cover 3. Is formed. The lid portion 15a is connected to the locking portion 15b by a connecting portion 15c having an outer diameter smaller than the inner diameter of the drainage hole 3a in which the lid body 15 is locked. The locking portion 15b has a conical shape with a substantially elliptical bottom having a major axis slightly larger than the inner diameter of the drainage hole 3a, and is connected by a slit 15d having a predetermined width dividing the center of the conical shape with springiness. It is connected to the portion 15c. This lid 1
5 is a locking portion 15b from the outer side of the cover 3 in the drainage hole 3a.
The lid portion 15a is arranged at a position facing the drainage hole 3a outside the cover by abutting and press-fitting the tip of the locking portion 15b.
The drainage hole 3a is openably and closably locked by the drainage hole 3a.
The gap between the connecting portion 15c and the connecting portion 15c functions as a drain hole that also serves as a vent hole.

The lid 15 described above is disposed in the drainage hole 3a provided below the cover 3, and in a normal state, as shown in FIG. 3A, the drainage hole 3a and the drainage hole 3a.
Ventilation is performed through the opening of the gap between the substantially elliptical bottom of the locking portion 15b having a shorter diameter smaller than the inner diameter. Further, when water is sprayed in the vicinity of the antenna device, the cover portion 15a prevents the intrusion of water spray from the drain hole 3a, and in the case of direct water spray, the water is sprayed to the F shown in FIG. The lid portion 15a closes the drain hole 3a by the force of water pressure in the direction of, and prevents the sprinkling of water into the cover.

According to the above-described antenna device, the drain hole 3a can be closed by the lid 15 so as to prevent the sprinkling of splashed water from entering the inside, so that the ventilation is normally performed to prevent dew condensation. As well as being sprayed, the invasion of sprinkled water droplets is prevented during water sprinkling. Further, the drain hole 3a is closed at a position facing the drain hole 3a outside the storage body by the lid portion 15a of the lid body 15 having an outer shape larger than that of the drain hole 3a locked so as to open and close the drain hole 3a. As it becomes a thing, the invasion of sprinkling spray into the inside is further blocked and it is automatically closed by the water pressure during sprinkling,
There is no need to manually close the door.

[0026]

In the antenna device according to the first aspect of the present invention, since the waterproof plates having an outer shape equal to or larger than that of the drain hole are installed at positions facing each other inside the drain hole, ventilation is performed as usual to prevent dew condensation. As well as being sprayed, it is possible to prevent water spray from entering the inside.

In addition to the effect of the first aspect of the invention, the antenna device according to the second aspect has the waterproof plate fixed to the container, so that the antenna device is independent of the internal structure or size of the container. The waterproof plate can be installed at a position facing the drain hole.

Further, in the antenna device according to the third aspect of the present invention, the drain hole can be closed by the lid so as to prevent the splash of water from the outside from entering the inside, so that the ventilation is normally performed and the dew condensation occurs. In addition to being prevented, the invasion of spray droplets is prevented during spraying.

In addition to the effect of the antenna device according to claim 3, the antenna device according to claim 4 has a drain hole which is locked at a position facing the drain hole outside the housing so as to open and close the drain hole. Since the drain hole is closed by the lid part of the larger outer shape, it is possible to further prevent the splash of water from entering the inside and to automatically close it by the water pressure at the time of water spraying, and to close it manually. Is unnecessary.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an antenna device according to a first embodiment of the present invention.

2 is a perspective view of a waterproof plate which is a main part of the antenna device shown in FIG. 1, in which (a) is an exploded view and (b) is an assembled state view.

FIG. 3 is a partial view of a drain hole which is a main part of the antenna device according to the second embodiment, in which (a) shows a normal state and (b) shows a closed state.

FIG. 4 is a partial perspective view of a drainage hole which is a main part of the antenna device shown in FIG. 3, in which (a) is an exploded view and (b) is an assembled state view.

FIG. 5 is a sectional view of a conventional antenna device.

[Explanation of symbols]

 3 Cover (Housing) 3a Drainage Hole 4 Antenna Element 5 Ground Plate (Housing) 14 Waterproof Plate 15 Lid 15a Lid 15b Locking

Front page continuation (72) Inventor Keishi Iriyama 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (4)

[Claims] 1. An antenna device having a housing attached to a construction surface such as a ceiling and having a drain hole that also serves as a vent hole for housing one or more antenna elements, the inside of the drain hole facing each other. An antenna device having a waterproof plate having an outer shape equal to or larger than the drain hole at a position. 2. The antenna device according to claim 1, wherein the waterproof plate is fixed to the housing. 3. An antenna device having a housing attached to a construction surface such as a ceiling and having a drain hole that also functions as a vent hole for housing one or a plurality of antenna elements, wherein the drain hole is provided from the outside. An antenna device having a lid capable of being closed so as to prevent the water spray from entering the inside. 4. The lid body has a lid portion having an outer shape larger than the drainage hole, and a locking portion for locking the lid portion to the storage body, and the lid portion faces the drainage hole outside the storage body. The antenna device according to claim 3, wherein the antenna device is arranged at a position where the drain hole is opened and closed by a locking portion.