JPH088629A - Built-in antenna for compact radio equipment - Google Patents

Abstract

PURPOSE:To keep the excellent appearance and electrical characteristic of an antenna for a long period of time and also to reduce the cost and the manufacturing period of the antenna by applying the coating on the surface on a plate type antenna substrate excluding its both ends which are connected to a printed board. CONSTITUTION:An insulated material of high heat resistance and high hardness is applied on the entire surface of an antenna substrate 102 including its outer surface and excluding its both end parts 101 which are connected to the circuits of a printed board. In, other words, the parts 101 are masked by taping, etc., and an antenna 10 is totally put into a bath containing the fused insulated material such as epoxy resin, nylon resin, etc., for coating. Otherwise the heated antenna 10 is put in an atmosphere where the insulated material is turned into the fine powder, and this powder attached on the antenna surface is welded. Thus a silver plated layer 103 is formed on the surface of the substrate 102, and furthermore an insulated layer 104 is formed on time entire surface of the substrate 102 excluding both parts 101. As a result, the antenna 10 of such a constitution is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna incorporated in a small radio equipment such as a radio call receiver, and more particularly to an antenna which has an easily oxidized surface finish such as silver plating, and a printed board in the equipment. The present invention relates to a built-in antenna of a small wireless device that is installed close to each other.

[0002]

2. Description of the Related Art FIG. 3 is an exploded perspective view showing a general antenna mounting structure of a radio paging receiver. As shown in the figure, in the radio paging receiver, circuit components are mounted on the printed board 1, and the antenna 4 is also mounted on the printed board 1 together with the battery case 2, the ROM 3, etc. The structure is accommodated in the cover 6. Here, the antenna 4 forms a loop antenna by forming an intermediate portion in a loop shape.

4 and 5 show the antenna 4 shown in FIG.
4A and 4B are a perspective view and a cross-sectional view for explaining FIG. In both figures,
In the antenna 4, an antenna substrate 41 formed of a brass plate, a phosphor bronze plate or the like is formed into a predetermined loop shape, and a silver plating layer 42 is provided on the entire surface for the purpose of improving electrical characteristics.

The silver plated layer 42 is easily oxidized, and in particular, due to a sulfidizing effect, the silver plated layer 42 is darkened during the manufacturing process and during use, and its appearance is likely to deteriorate. Therefore, conventionally, in order to prevent the deterioration of the external appearance, the insulating layer 43 is formed by spray coating on the external surface.

Further, as described above, since the antenna 4 is mounted close to the printed board 1, there is a risk of short-circuiting with the electrical component leads, the chip component mounting solder, etc. on the printed board 1. Therefore, conventionally, on the inner surface of the antenna 4,
The insulator 7 made of polyester film was attached with double-sided tape.

[0006]

In the above-mentioned conventional antenna, since the rust-proof treatment of the silver plating layer 42 is applied only to the outer surface, the electrical characteristics may be deteriorated due to the oxidation of the inner surface.

Further, since the insulator 7 is attached for insulation, the cost of the insulator 7 is high, and the production lead time is increased by the amount of the attaching work.

Further, since the insulating layer 43 on the surface is formed by spray coating, the coating cannot be made to have a uniform thickness, and the precision varies.

The present invention has been made in view of the above-mentioned problems, and it is possible to maintain excellent appearance and electrical characteristics for a long period of time, and to reduce cost and manufacturing time by eliminating the need for an insulator. It is an object of the present invention to provide a built-in antenna for a small wireless device that can be used.

[0010]

In order to achieve the above object, in a built-in antenna of a small radio equipment of the present invention, a plate antenna board is formed in a loop shape in the vicinity of a printed board on which electric parts are mounted. Moreover, both ends thereof are connected to a printed circuit board, and coating is applied to surfaces of both ends of the plate-shaped antenna substrate which are connected to the printed circuit board. For coating, either dipping means for immersing the antenna in a bath in which the insulating material is melted, or powder coating means for heating the antenna and putting the insulating material in a fine powder atmosphere is adopted. . Then, with this type of coating, an insulating layer having high heat resistance and hardness can be formed with a uniform thickness.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of an antenna showing an embodiment of the present invention, showing both ends of the antenna. 2 is a partial cross-sectional view of the antenna shown in FIG.

The antenna of this embodiment is a modification of the built-in antenna of a general radio paging receiver as shown in FIG. 4, and the antenna shape and the mounting structure on the receiver are the same as those described above. It is similar to the case of.

As shown in FIG. 1, the characteristic configuration of the antenna 10 of this embodiment is that it has heat resistance and hardness not only on the outer surface but also on the entire surface except both end portions 101 connected to the circuit on the printed board. It is a coating of high insulation. As the insulating material, for example, epoxy resin, nylon resin or the like is used.

The above-mentioned coating is performed by using the following means, which is different from the conventional means of spray coating.

First, both ends 101 shown in FIG. 2 are masked by taping or the like. Next, the entire antenna is dipped in a bath in which an insulating material such as epoxy resin or nylon resin is melted to perform coating (dipping means). Alternatively, the heated antenna 10 may be placed in an atmosphere in which the insulating material is in the form of fine powder, so that the powder adheres to the antenna surface and at the same time the powder is welded (powder coating means). By such means, the uniform insulating layer 104 can be formed, and the accuracy can be improved. In addition, these means,
Has a sufficient track record of quality and accuracy in the field of IC manufacturing. By these means, the insulating layer 104 having a thickness of about 0.1 mm can be formed.

In this way, the silver-plated layer 103 is formed on the surface of the antenna substrate 102 as shown in FIG. 2, and the insulating layer 104 is formed on the entire surface (excluding both ends 101).
It is possible to manufacture the antenna 10 having the structure. Both ends 1
01 is connected to the printed board by soldering as usual.

It should be noted that the present invention is not limited to the above-described embodiment, but can be carried out in modes other than the built-in antenna for the radio paging receiver shown in FIG. 3, for example. Further, if the insulating material forming the insulating layer is colored in black or the like, a stain-free appearance can be obtained.

[0019]

As described above, according to the present invention, the insulating layer having excellent heat resistance and high hardness is formed on the entire antenna surface (excluding both ends) by the dipping means and the powder coating means. In addition, it is possible to eliminate the conventionally required insulator, and it is possible to reduce the cost and the manufacturing time.

Further, since the insulating layer is formed on the entire surface (excluding both ends), there is an effect that even if it is touched with a finger during manufacturing, there is no fear of oxidation or discoloration in the future.

Further, as compared with the case where the insulating layer 7 is formed by spraying and sticking a tape, it is possible to form an insulating layer having a uniform thickness.

[Brief description of drawings]

FIG. 1 is a perspective view showing both ends of an antenna showing an embodiment of the present invention.

FIG. 2 is a partial sectional view of the antenna shown in FIG.

FIG. 3 is an exploded perspective view showing a general antenna mounting structure of a conventional radio paging receiver.

FIG. 4 is a perspective view illustrating the antenna shown in FIG.

5 is a cross-sectional view illustrating the antenna illustrated in FIG.

[Explanation of symbols]

 1 Printed Circuit Board 2 Battery Case 3 ROM 4 Antenna 5 Case 6 Top Cover 7 Insulator 41 Antenna Substrate 42 Silver Plated Layer 43 Insulation Layer 10 Antenna 102 Antenna Substrate 103 Silver Plated Layer 104 Insulation Layer

Claims (6)

[Claims] 1. A plate-shaped antenna substrate is formed in a loop shape in the vicinity of a printed circuit board on which electrical components are mounted, and both ends thereof are connected to the printed circuit board and connected to the printed circuit board of the plate-shaped antenna circuit board. The built-in antenna of a small radio device characterized in that an insulating layer having high heat resistance and hardness is formed with a uniform thickness by coating the surface other than both ends by immersing it in a bath in which the insulating material is molten. . 2. The built-in antenna for a small radio device according to claim 1, wherein the insulating material is an epoxy resin. 3. The built-in antenna for a small radio device according to claim 1, wherein the insulating material is nylon resin. 4. An atmosphere in which a plate-shaped antenna substrate is formed in a loop shape in the vicinity of a printed circuit board on which electric parts are mounted, and both ends thereof are connected to the printed circuit board, and an insulating material is in the form of fine powder. By putting the heated plate-shaped antenna inside, the surface of the plate-shaped antenna substrate other than both ends connected to the printed circuit board is coated,
A built-in antenna for a small radio, which is characterized by forming an insulating layer having high heat resistance and hardness with a uniform thickness. 5. The built-in antenna for a small radio device according to claim 3, wherein the insulating material is an epoxy resin. 6. The built-in antenna for a small radio device according to claim 3, wherein the insulating material is nylon resin.