JPH05152820A - Antenna system - Google Patents

Abstract

PURPOSE:To obtain an antenna for a wall face buried type wireless equipment in which the impedance characteristic is not limited due to the size limit of the antenna, the deterioration in the performance/efficiency due to a problem on the installation is not caused with excellent installation performance, without loss of external appearance. CONSTITUTION:A conductive material having an antenna shape is adhered and inserted to the inner face of a dielectric cover 6 for shielding a boundary between a wall hole for burying and an equipment 1 by printing or two-color forming and a feeding connector 8 to an antenna at the time of mounting the dielectric cover 6 is connected electrically by mutual pressing or a spring means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device, and more particularly to an antenna device for a radio equipment embedded in a wall or ceiling of a building.

[0002]

2. Description of the Related Art Conventionally, an antenna for a wireless device of this type, which is embedded in a vertical wall surface, a ceiling surface or the like (hereinafter, simply referred to as a wall surface), is constructed as shown in any of the following.

1) As disclosed in, for example, Japanese Patent Application Laid-Open No. 62-171208, an antenna having a size within the shape of the device is arranged inside or very close to the housing of the device. Or 2) disposing an antenna having a sufficient size on the back surface of the device, that is, on the back side of the wall surface,
Alternatively, 3) there is a method of disposing an antenna having a sufficient size on the front surface of the device, that is, on the front surface of the wall surface.

[0004]

However, each of the conventional antenna configurations as described above has the following problems.

1) In the case of the above configuration 1), the size and size of the antenna are limited by the housing or the like, as disclosed in, for example, Japanese Patent Laid-Open No. 62-171208, which is necessary. Impedance characteristics may be limited, and the characteristics may be deteriorated by being shielded by a metal object such as a device mounting bracket or a fireproof plate that may be necessary for disaster prevention.

2) In the case of the above configuration 2), the workability is poor because of the back side of the wall surface, and the antenna shape may be deformed due to the wiring, the pillar material, the heat insulating material, etc. on the back surface of the wall, and the efficiency may deteriorate. there were.

3) In the case of the configuration 3), the appearance may be significantly impaired. The present invention has been made in view of the problems of the conventional example as described above, and provides a wall-embedded wireless device antenna of this type which has high performance / efficiency, excellent workability, and does not impair the appearance. It is intended to be provided.

[0008]

For this reason, in the present invention, in a wall- or ceiling-surface-embedded wireless circuit built-in device system, a dielectric cover for concealing the boundary between the buried wall hole and the device. While the antenna is formed on the inner surface of the device, when the dielectric cover is attached, the power feeding connector part of the device body to the antenna is connected so as to be electrically openable by mutual pressure bonding or elastic contact by spring means, The purpose of the present invention is to achieve the object by making the dielectric cover detachable from the device body.

[0009]

With the antenna configuration as described above, the antenna is disposed closer to the communication area than the metal member such as the mounting bracket or the fireproof plate of the device, so that it is not electromagnetically shielded and the characteristics may deteriorate. Absent. In addition, the dielectric cover can be easily attached and detached, and since the connection can be made only by mating, the workability is good and the antenna is not unduly stressed.

Furthermore, since the antenna shape can be increased to the full extent of the inner surface of the dielectric (decorative) cover, which is larger than itself for shielding the device, the impedance characteristic is good even at low frequencies, and the appearance is due to the inner surface of the decorative cover. There is no danger of damaging.

[0011]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a vertical cross-sectional view of an essential part of a ceiling-embedded wireless device system equipped with an embodiment of an antenna device according to the present invention, and FIGS. 2 (a) and 2 (b) show the dielectric decorative cover. 2 shows two examples of backside plan views of FIG.

In FIG. 1, reference numeral 1 denotes a device main body having a built-in radio circuit, which is embedded in a mounting hole formed in a ceiling member 3 by using a mounting bracket 2. Reference numeral 4 indicates the above ceiling. Reference numeral 5 is a metal fireproof plate for protecting the device body 1 from a fire. These devices are covered with a detachable decorative cover 6 made of a dielectric material to adjust the appearance.

The feature of this embodiment is that the antenna A is constructed by disposing a folded dipole antenna element A1 as shown in FIG.

The antenna element A1 has a pair of feeding points 7 at its ends and is connected to the device body 1 by a feeding connector section 8 shown in FIG. The connector portion 8 is provided in the holes formed in the mounting bracket 2 and the fireproof plate portion,
When the decorative cover 6 is attached, the feeding points 7 of the antenna element A1 are pressed against each other, or elastically contact with each other via spring means (not shown). When the decorative cover 6 is removed, this electrical contact is released. Is configured.

The characteristics of the step of forming the antenna A will be described. The antenna element A1 is configured by printing a conductive substance on the inner surface of the decorative cover 6.

An example of another step of forming the antenna A will be described. The feature of the second embodiment lies in that it is constructed by incorporating a conductive resin body having an antenna shape on the inner surface of the decorative cover 6 by two-color molding.

After forming the antenna A by these methods,
The surface of the antenna can be coated with an appropriate resin paint to improve the stability, durability, and productivity of the antenna.

[0018]

As described above, according to the present invention, the antenna device is electromagnetically shielded because the antenna is arranged closer to the communication area than the metal body such as the mounting bracket of the device body or the fireproof plate. Therefore, the characteristics are not deteriorated. Conversely, grounding these metal bodies stabilizes the impedance characteristics depending on the antenna.

Since it is easy to attach and detach, it has excellent workability,
There is no fear of excessive stress on the antenna. Furthermore, since the antenna shape can be made larger than that of the main body of the device, it is also advantageous for low frequencies, and does not affect the appearance because of the inner surface of the decorative cover.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of main parts of a ceiling-surface-embedded wireless device system including an antenna device according to an embodiment.

2A and 2B are two examples of backside plan views of the dielectric decorative cover.

[Explanation of symbols]

 1 Equipment main body 3 Ceiling material 6 Dielectric decorative cover 7 Feed point 8 Feed connector A Antenna A1 Folded dipole antenna element

Claims (3)

[Claims] 1. In a buried type wireless circuit built-in device system in which a wall or a ceiling is provided with a hole, the inner surface of a dielectric cover for concealing the boundary between the hole for burying and the device body is electrically conductive. An antenna is formed by printing a substance, a power feeding protrusion is provided on the conductive material printing portion of the dielectric cover, and a power feeding connector portion is provided on the device body. An antenna device, wherein a power feeding connector part is connected to the power feeding protrusion in a mating manner. 2. A buried type wireless circuit built-in device system in which a wall or a ceiling surface is provided with a hole, and the inner surface of a dielectric cover for concealing the boundary between the buried hole and the device body is bicolor. A conductive resin antenna is formed by molding, a conductive protrusion is provided on the conductive resin portion of the dielectric cover, and a power supply connector portion is provided on the device body.
An antenna device characterized in that, when the dielectric cover is attached, the power feeding connector portion of the device body is connected to the power feeding protrusion in a mating manner. 3. The antenna device according to claim 1, wherein the antenna has a folded dipole antenna shape.