JPH0221765Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an antenna mounting structure, and particularly to a mounting structure of a loop antenna housed in a housing of an electronic device such as a thin, small radio device.

[Technical background of the invention]

FIG. 1 is an exploded perspective view of a small radio device 1 showing a conventional antenna mounting structure.

A printed wiring board 6 on which electronic components 5 are mounted is housed inside a casing 4 consisting of an upper cover 2 and a lower cover 3 of the small radio device 1. Further, the transmitting and receiving loop antennas 7, 8 used in the radio device 1 are constructed of loop-shaped metal plates 9, 10 having a predetermined thickness. To mount the loop antennas 7 and 8 inside the housing 4,
The bases 9a, 9b, 10a, 10b protruding from both ends of the antennas 7, 8 are fitted into the holes 6a formed at predetermined positions of the printed wiring board 6, and then soldered to the bases 9a, 9b, 10a, 10b. Base portions 7a, 7b, 8
This is done by connecting circuit patterns a, 8b and a circuit pattern (not shown) formed on the printed wiring board 6.

[Problems with background technology]

By the way, according to the conventional antenna mounting structure described above, the loop antennas 7 and 8 are formed by the rigid metal plates 9 and 10, and in order to fit and support the loop antennas 7 and 8 into the holes 6a of the printed wiring board 6, the metal plates are 9,10
The opposite ends of the bases 9a, 9b, 10a, 10b become free ends and tend to wobble, so thick metal plates 9, 10 are used to securely fix the loop antennas 7, 8. , the weight of the radio device 1 increases, and this also becomes a factor in increasing costs. In addition, loop antennas 7 and 8 made of rigid bodies
must be installed in a thin and small casing 4 without reducing the gain, so when designing the casing and mounting electronic components within this casing
These must be fully taken into account when designing or arranging them, which makes the housing structure complex, and during assembly and maintenance work, careful attention must be paid to avoid reducing the antenna gain. As a result, assembly and maintenance and inspection work have become extremely complicated. Furthermore, since the conventional loop antennas 7 and 8 are rigid and large, they occupy a large space. Therefore, it is difficult to further reduce the size of the radio device 1 by increasing the mounting density of electronic components housed in the housing. I couldn't do it. Furthermore, if the conventional loop antennas 7 and 8 come into contact with other parts during assembly or maintenance and inspection work and are damaged, there is a risk of corrosion or insulation breakdown, so preventive measures should be taken. Plating to prevent rust and coating with insulators had to be applied, which added to the number of steps.

[Purpose of invention]

This invention aims to eliminate the above-mentioned drawbacks, form a lightweight loop antenna that occupies a small space, and provide an antenna mounting structure that allows this antenna to be easily installed in the housing of an electronic device. purpose.

[Summary of the idea]

In this idea, a loop antenna is formed on the surface of a flexible substrate, and the surface of the pattern is covered with a coating film to form a loop antenna. The above-mentioned purpose is achieved by attaching it across a printed wiring board.

[Example of idea]

Hereinafter, the present invention will be described in detail based on embodiments of the present invention.

FIG. 2 is an exploded perspective view of the small radio device 1 showing the antenna mounting structure of the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals.

The printed wiring board 6 housed in the casing 4 of the small radio device 1 includes both ends 6a of the printed wiring board 6,
A loop antenna 20 made of a flexible substrate 10 is attached across the antenna 6b. As shown in FIG. 2 and FIG. 3, which is a partial cross-sectional view taken along line AA in FIG. 11 and 12 are formed, respectively. Note that the loop-shaped antenna patterns 11 and 12 are formed by etching or the like in the same manner as a normal printed wiring board. Further, a coating film 13 is attached to the substrate base 10a of the flexible substrate 10 to cover the loop-shaped antenna patterns 11 and 12, so that the loop-shaped antenna patterns 11 and 12 are protected from the environment such as corrosion. protected.

On the other hand, in order to mount the above-described flexible substrate 10 across the ends 6a and 6b of the printed wiring board 5, as shown in FIG. 4, which is a perspective view of the main part of FIG.
Parts 11a and 12a of the antenna patterns 11 and 12 exposed at one end of the flexible substrate 10 are
A flexible connector is soldered to a power supply pattern 6c formed on one end 6a of the printed wiring board 6, and the other end is placed on the other end 6b of the printed wiring board 6 as shown in FIG. It is passed to the board connector 14, fitted, and supported there.

According to the mounting structure of the loop antenna 20 described above, the loop antenna 20 is mounted on the flexible substrate 10.
Because of its flexibility, it can be mounted across the top surface of the printed wiring board 6 and with a gap between it and the electronic components 5 mounted on the printed wiring board 6. Figure 3). Furthermore, since one end of the flexible substrate 10 is detachably connected to the connector 14, when this end is removed from the connector 14, the upper surface of the printed wiring board 6 can be easily opened.

In addition, in the above embodiment, the flexible substrate 10
Part 11 of antenna pattern 11, 12 at one end of
a, 12a are exposed and soldered to the power supply pattern 6c formed on the printed wiring board 6, but the present invention is of course not limited to the above embodiment, and the same parts as shown in FIG. As shown in the main part perspective view of FIG. 5, in which the same reference numerals are used, the ends 11b and 12b of the antenna patterns 11 and 12 formed on the flexible substrate 10 are formed to protrude from the flexible substrate 10, and these ends are Part 11
b, 12b is fitted into a hole 6d formed in one end 6a of the printed wiring board 6, and a pattern of a power feeding part (not shown) formed in this printed wiring board 6 and the ends 11b of the antenna patterns 11, 12 are fitted. , 12b may be connected by soldering.

[Effect of idea]

As explained above, in this invention, the loop antenna is formed from a flexible substrate and is mounted by passing it across the printed wiring board housed in the electronic device housing, so the space occupied by the loop antenna is small. , and it is lightweight. Therefore, the casing of the electronic device can be made small and thin, and the packaging density of electronic components housed inside the electronic device can also be improved. Furthermore, when mounting the flexible board, one end of the flexible board is detachably attached to the printed wiring board, which facilitates assembly and maintenance/inspection work.

[Brief explanation of the drawing]

FIG. 1 is an assembled and disassembled perspective view of a small radio device showing a conventional antenna mounting structure, FIG. 2 is an assembled and disassembled perspective view of a small radio device showing an antenna mounting structure according to the present invention, and FIG. 4 is a perspective view of the main part of FIG. 2, and FIG. 5 is a perspective view of the main part of FIG. 2 showing another embodiment. 1... Small radio device, 4... Housing, 6... Printed wiring board, 10... Flexible board, 10a... Board base, 11, 12... Loop pattern, 1
3...Coating film, 14...Flexible board connector, 20...Loop antenna.

Claims (1)

[Claims for Utility Model Registration] (1) In an antenna mounting structure in which a loop antenna is attached to a printed wiring board housed in a housing of an electronic device, the loop antenna is attached to a flexible substrate base made of an insulator. A loop-shaped pattern made of a conductor formed on this substrate base is formed to form a flexible substrate, and both ends of this flexible substrate are passed onto the printed wiring board via connecting means arranged on the printed wiring board. An antenna mounting structure characterized in that the antenna is mounted on the antenna. (2) Utility model registration claim No. (1) characterized in that a coating film is attached to the upper surface of the substrate base of the flexible substrate to cover the loop-shaped pattern.
Antenna mounting structure described in section. (3) The antenna mounting structure according to claim 1, wherein one of the connecting means is at least a flexible board connector.