JPH0138967Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of an AM receiving antenna device.

Conventional configurations and their problems Ferrite bar antennas are often used in AM receivers.

A conventional antenna device will be explained below.

FIG. 1 shows a conventional antenna device, where 1 is an antenna case with a built-in ferrite bar antenna, 2 is a holder, and as shown in the cross-sectional view of FIG. 2, a part thereof has a recess 2a. 3 is a holder attached to the board 6 of the chassis, rear plate, etc.;
As shown in the cross-sectional view of the figure, there is a dowel 3a. After inserting and fixing the antenna case 1 into the holder 2, insert the holder 2 into the holder 3, and make the recess 2.
A is fitted into the dowel 3a, and the holder 3 is further inserted and attached to a substrate 6 such as a rear plate.

However, in the conventional antenna device configured as described above, since one side of the holder 3 is closed, the direction of the ferrite antenna can only be rotated by about 90 degrees around the center line connecting the upper and lower dowels of the holder 3. Can not. Furthermore, since the antenna cannot be removed from the board 6, it is not possible to remove the antenna and move it to a location where it is most sensitive and is not subject to other interference (such as the recording bias of a tape deck). Furthermore, since two types of holders are required, the cost is high.

Purpose of the invention This invention solves the above conventional problems.
To provide an antenna device for AM reception in which the direction of the antenna can be rotated by about 180 degrees, the antenna can be easily removed and moved to another place where it will not be subjected to interference, and only one holder is required. purpose.

Structure of the invention The invention consists of an antenna case with a through hole provided at a predetermined position from one end in a direction perpendicular to the central axis, and a cross section with one dowel on each flexible surface facing each other. The antenna device is equipped with a U-shaped holder, and by fitting the dowels into the through holes, the antenna can rotate approximately 180 degrees horizontally about the center line connecting the two dowels, and each of the holders By expanding the surface, the antenna can be easily removed and moved.

DESCRIPTION OF EMBODIMENTS FIGS. 4 and 5 illustrate an antenna device according to an embodiment of the present invention. In Figures 4 and 5, 4 is a pipe-shaped antenna case with through holes 4a and 4a' provided at predetermined positions from one end in a direction perpendicular to the central axis, and 5 is a drop strength of two pieces facing each other. It is a U-shaped holder having dowels 5a and 5a' that can withstand In addition, 6 is a board, 7 is a ferrite antenna housed in the antenna case 4, and 8 is a lead wire.

As shown in the cross-sectional view of Fig. 5, the antenna case 4
When the dowels 5a, 5a' of the holder 5 are inserted into the through holes 4a, 4a', respectively, the two dowels 5a, 5
The antenna case 4 is centered around the center line connecting a′.
Can be rotated 180°. Furthermore, since the opposing pieces of the holder 5 have elasticity, the antenna case 4 can be easily removed and moved by unfolding them. However, the antenna lead wire 8 needs to be long enough to allow the antenna case 4 to move freely.

In the above embodiments, a ferrite bar antenna is used as an example, but the same applies to a loop antenna.

Effects of the invention In the present invention, a through hole is provided in the antenna case, and the antenna case is attached to a holder having a U-shaped cross section and having one dowel on each flexible surface facing each other. The antenna can be rotated approximately 180 degrees horizontally around the center line of the two dowels, making it possible to point the antenna in the direction of the broadcast station for the most sensitive reception. Since the antenna can be easily removed and moved, it is less susceptible to interference such as the recording bias of a tape deck. Furthermore, the holder requires only one component, making it possible to realize an excellent antenna device that can be provided at low cost.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional antenna device, Figure 2 is a perspective view of a conventional antenna device.
3 is a cross-sectional view of the main part thereof, FIG. 4 is a perspective view of an antenna device according to an embodiment of the present invention, and FIG.
The figure is a sectional view of FIG. 4. 4...Antenna case, 4a, 4a'...Through hole, 5...Holder, 5a, 5a'...Dowel, 6...
... Board, 7... Ferrite antenna, 8... Lead wire.

Claims (1)

[Scope of utility model registration request] An antenna case with a through hole in a direction perpendicular to the central axis at a predetermined position from one tip, and a holder with a U-shaped cross section that has one dowel on each flexible surface facing each other. , fit the through hole of the antenna case to the dowel of the holder, attach the holder to the object to be attached so that the two dowels are perpendicular, and insert the holder into the antenna case with the center line of the two dowels as the axis. Antenna device that rotates the antenna horizontally by approximately 180 degrees.