JPH0595215A - Antenna system - Google Patents

Abstract

PURPOSE:To obtain the antenna system with a high performance/efficiency, excellent installation work and whose external appearance is not damaged for a device on a wall face mount or built in a ceiling face recessed mount radio circuit. CONSTITUTION:A folded dipole antenna element A1 of an antenna A is disposed to fully the rear side of a plate of a removable decoration cover 6 made of a dielectric material covering a device main body 1 with the adhesion of a conductive sheet, the feeding points of a feeding connector 8 of the device main body 1 are in pressurized contact with each other on the mounting of the decoration cover 6 or are constituted open so as to be in elastic contact via 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 buried in a vertical wall surface, a ceiling surface, or the like (hereinafter, simply referred to as "wall surface"), is constructed as shown in any of the following. .. That is, 1) An antenna having a size within the shape dimension of the device is arranged in or near the housing of the device. Alternatively, 2) an antenna having a sufficient size is provided on the back surface of the device, that is, the back side of the wall surface, or 3) an antenna having a sufficient size size on the front surface of the device, that is, the front side of the wall surface. And so on.

[0003]

However, each of the conventional antenna configurations as described above has the following problems. That is, 1) In the case of the configuration 1), the size and size of the antenna are Since it is limited by the housing, etc., the required impedance characteristics may be limited, and the characteristics are shielded by metal objects such as equipment mounting brackets and fireproof plates that may be necessary for disaster prevention. There was a possibility of deterioration. Also,
2) In the case of the above configuration 2), the workability is poor because it is on the back side of the wall surface, and there is a possibility that the antenna shape may be deformed by the wiring on the back wall, the pillar material, the heat insulating material, etc., and the efficiency may deteriorate. Furthermore, 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 has high performance / efficiency, excellent workability, and does not impair the external appearance. The purpose is to provide an antenna for use.

[0005]

Therefore, according to the present invention, in a device system with a built-in wireless circuit embedded in a wall surface or a ceiling surface, a dielectric cover for concealing the boundary between the burying wall hole and the device is provided. An antenna is formed by pasting a conductive sheet on the inner surface, and when this dielectric cover is attached, the power feeding connector part of the device can be electrically opened by mutual pressure bonding or elastic contact by spring means. By connecting the dielectric cover to the container so that it can be attached to and detached from the device by being connected, the above object is achieved.

[0006]

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. Also, since it is easy to put on and take off, the workability is good and the antenna is not subjected to excessive stress. Furthermore, since the antenna shape can be increased to the full inner surface of the dielectric (decorative) cover, which is larger than itself for shielding the device, the impedance characteristics are good even at low frequencies, and the appearance is improved due to the inner surface of the decorative cover. There is no fear of damaging it.

Further, since the antenna is formed thin like a sheet, it is not necessary to make the decorative cover thicker than before.

[0008]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a vertical cross-sectional view of a main part of a ceiling-embedded wireless device system including an antenna device according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) show the back surface of the dielectric decorative cover. Two examples of a top view are shown.

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 placed on the entire back surface of the plate portion of the decorative cover 6 and the folded dipole antenna element A made of a conductive sheet as shown in FIG.
It is configured by arranging ₁ . The antenna element A ₁ has a pair of feeding points 7 at its ends, and is connected to the device body 1 by the feeding connector section 8 shown in FIG. The connector portion 8 is provided in a hole formed in the mounting member 2 and the fireproof plate portion, and when the decorative cover 6 is attached, the feeding points 7 of the antenna element A ₁ are pressed or not contacted. When the decorative cover 6 is removed by elastically contacting it through the illustrated spring means, this electrical contact is opened.

Next, an example of the process of forming the antenna A will be described. In the antenna element A ₁ , an antenna-shaped conductive sheet is attached to the inner surface of the decorative cover 6, or an antenna-shaped conductive portion is provided on a sheet having a size that covers the entire back surface of the decorative cover 6 so as to be easily attached. It may be one. Alternatively, the conductive sheet may be insert-molded when the decorative cover 6 is molded. After forming the antenna A by the above method, the surface can be coated with a suitable resin paint or the like to improve the stability, durability, productivity and the like of the antenna.

(Other Embodiment) FIG. 2 (b) is a view corresponding to FIG. 2 (a) of another embodiment having an antenna element A ₂ using a disc-shaped conductive sheet. Reference numerals 7 and 9 respectively denote a single feeding point and a grounding point, and are configured to be connected / opened to the feeding connector section 8 of the corresponding device body in the same manner as the above example. It should be noted that the shape of these antenna elements may adopt various types such as a loop antenna and an inverted F-shaped antenna in addition to the above, and the materials and configurations thereof are not limited to the illustrated examples.

[0013]

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. Also, since it is easy to attach and detach, it has excellent workability, and there is no fear of applying undue stress to 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. Furthermore, since the conductive sheet is laminated, it is resistant to mechanical shock, and since it is sheet-shaped, it is not necessary to increase the conventional thickness of the decorative cover 6.

[Brief description of drawings]

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

[FIG. 2] 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 8 Feed connector A Antenna A ₁ Conductive sheet antenna element

Claims (2)

[Claims] 1. In a wall-mounted or ceiling-surface-embedded wireless circuit built-in device system, a conductive sheet is attached to the inner surface of a dielectric cover for concealing the boundary between the buried wall hole and the device, thereby forming an antenna. In addition to forming the dielectric cover, when the dielectric cover is attached, the power feeding connector part to the antenna of the device is electrically openable by mutual pressure bonding or elastic contact by the spring means, so that the dielectric cover is An antenna device characterized by being configured to be attachable to and detachable from a container in a device. 2. The antenna device according to claim 1, wherein the antenna has a folded dipole antenna shape.