JPS6012327Y2 - bar antenna - Google Patents

Description

[Detailed Description of the Invention] In the present invention, a bobbin with a coil is slidably arranged around a bar antenna core, and in this case, a knob provided on the bobbin is attached to a housing case of the bar antenna core and the bobbin. This invention relates to a bar antenna exposed through an opening.

Conventionally, as shown in Fig. 1, this type of bar antenna 1 was rotatably attached to the back panel 3 of a tuner 2 by means of a connecting plate 4, and was placed on the side of the back panel 3 when not in use.
It is known that the device is designed to be inserted into the device and lifted toward the back when in use.

Note that 5 is the front panel of the tuner, and 16 is a tuning knob.

As shown in FIGS. 2 and 3, such a bar antenna 1 includes a coil bobbin with a coil 8 surrounding a ferrite bar 7 housed in a bar antenna case 6 in order to adjust the sensitivity of the tuner to the best point. 9 is arranged so as to be slidable in the length direction of the bar 7, and by adjusting the position of the bobbin 9, the coil 8
controls the position of.

The case 6 is divided at its center into a pair of case parts 6a and 6b that have a semicircular cross section and can be opened and closed.

These case parts are integrally connected at one side edge, and at the other side edge, the case 6 is in the closed state.

In this closed state, the slit-like cutout 12 provided in one case portion 6a forms a slit 14 that exposes the protrusion-like knob portion 13 of the bobbin 9 described above.

Therefore, along this slit 14, the knob 1 of the bobbin 9
3 and slid the bobbin 9 in the length direction of the bar 7, and was able to set it in a predetermined position.

In Figs. 2 and 3, a pair of left and right bobbins 9 are provided, of which the left one is for L band and the right one is for MW band.
It is used as a band, and the sensitivity can be adjusted depending on the purpose.

Therefore, in such a bar antenna, it is important to fix the position of the coil bobbin 9, that is, the coil 8 after adjustment.

A conventionally known fixing method generally involves applying adhesive 15 or sealing wax between core 7 and bobbin 9 through the above-mentioned slit 14.

However, in this case, the bar antenna 1 is attached to the back panel 3 of the tuner, and the bobbin 9 is housed in the case 6, so it is necessary to drip the adhesive through the narrow slit 14, so this work is difficult. It was extremely troublesome and the workability was extremely poor.

The present invention has been made to correct these defects, and in the bar antenna mentioned at the beginning, the knob of the bobbin and the wall of the storage case facing the opening are fitted in a concave and convex manner. The present invention relates to a bar antenna, characterized in that the bobbin is fixed at a predetermined position.

With this configuration, the bobbin can be fixed very efficiently with one touch.

Examples of the present invention will be described below with reference to FIGS. 4 to 8.

In this embodiment, parts common to those in FIGS. 1 to 3 are denoted by common reference numerals, and explanations thereof will be omitted.

The bar antenna according to this embodiment is fundamentally different from the conventional example in that a hook portion 20 having a 7-shaped cross section and a vertical wall portion 21 that forms a pair with the hook portion 20 are integrally provided on one end side of the coil bobbin 9. It is that you are.

The hook portion 20 corresponds to the aforementioned knob portion,
It has a wedge-shaped bent piece 20a that can be elastically deformed at its tip, and the tip surface of this bent piece and the wall part 21 are inclined inwardly in opposite directions so as to easily accept the case end surface, which will be described later. are doing.

On the other hand, one case part 6b of the case 6 has a case part 6a.
A vertical small protruding wall portion 31 is provided along the joining area with the cylindrical member 31.

This projecting wall portion 31 is formed to be somewhat longer than the distance between the hook portion 20 and the vertical wall portion 21 described above.

According to the bar antenna configured in this manner, first, in the state shown in FIG. It can be freely slid within 14.

Therefore, the position of the coil 8 can be arbitrarily controlled for desired sensitivity adjustment.

Once the position of the coil is determined, as shown in FIG. 7, the hook portion 20 is pressed against the protruding wall portion 31 of the case portion 6b, and the protruding wall portion 31 is now inserted into the hook portion 20.

As a result, the bent piece 20a of the hook portion 20 is elastically deformed inward, and the protruding wall portion 31 is press-fitted into the hook portion 20 in a click motion while riding on the bent piece and the inclined surface of the wall portion 21.

In this state, the protruding wall portion 31 is firmly clamped between the hook portion 20 and the wall portion 21, so that the hook portion 20, that is, the bobbin 9, is completely locked and fixed in position.

In this case, since the protruding wall portion 31 is clamped, it is possible to securely lock the bar 7 without being influenced by dimensional tolerances of each portion or looseness between the bar 7 and the bobbin 9.

In this way, the hook portion 20 is easily fixed in position with good workability in the external posture shown in FIG.

Since this fixing is performed simply by mechanical locking without using any adhesive as in the past, the hook part 20 can be removed from the projecting wall part 31 by the reverse operation to the above, and the adjustment operation can be performed again. It is convenient because it allows you to

Although the present invention has been described above based on an embodiment, this embodiment can be further modified.

For example, depending on the size of the bobbin 9, the wall 2 of the bobbin 9
1 is no longer necessary, and the shape of the hook portion 20 can be modified in various ways.

Furthermore, the position of the slit 14 can also be changed to another location.

In the above example, the hook portion 20 is provided on the bobbin 9 side, but conversely, this type of hook portion may be provided on the case portion side, and a protrusion that fits into the protrusion may be provided on the knob portion side of the bobbin 9. is also possible.

In the present invention, as described above, since the coil bobbin and the case wall are fitted in a convex-concave manner, the bobbin can be fixed efficiently with good workability.

Moreover, since no adhesive or the like is used, the bobbin and the case wall can be mechanically separated and the bobbin can be moved again for sensitivity adjustment.

[Brief explanation of drawings]

1 to 3 show a conventional example, in which FIG. 1 is a plan view of a tuner, FIG. 2 is a perspective view of a bar antenna, and FIG. 3 is a sectional view of this bar antenna. 4 to 8 show embodiments of the present invention,
Figure 4 is a perspective view of the coil bobbin, Figure 5 is an enlarged perspective view of the main parts of the bobbin, Figure 6 is a sectional view of the bar antenna before the coil bobbin is locked, and Figure 7 is the bar with the coil bobbin locked. A sectional view of the antenna, and FIG. 8 is a perspective view of the bar antenna in the same locked state. In addition, in the symbols used in the drawings, 6...
...Case, 7...Ferrite bar (core),
8... Coil, 9... Coil bobbin,
14...Slit, 20...Hook part, 21...Vertical wall part, 31...Protruding wall part.

Claims (1)

[Scope of utility model registration request] A bar antenna in which a bobbin with a coil is slidably arranged around a bar antenna core, and in this case, a knob provided on the bobbin is exposed from an opening of a housing case for the bar antenna core and the bobbin, The bar antenna is characterized in that the knob portion of the bobbin and a wall portion of the storage case facing the opening engage in a concave-convex fit, thereby fixing the bobbin at a predetermined position.