JPH10215115A - External antenna coupler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect an external antenna to the receiver of a radio-cassette recorder or the like not equipped with an external antenna connection terminal. SOLUTION: A coil is housed inside a case and a loop antenna 12 is connected to the coil. A coupling tape is adhered and attached to the case. This coupler 1 constituted in such a manner is attached to the outside of the receiver 11 by the coupling tape. At the time of attaching it, the coupler 1 is moved, a place housing a bar antenna inside is found from the change of reception sensitivity and it is attached there. Thus, since radio waves received by the loop antenna 12 are inductively coupled to the bar antenna inside the receiver 11 in terms of high frequencies, the sensitivity of the receiver 11 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external antenna coupler which can be used for a simple audio equipment called, for example, a boombox.

[0002]

2. Description of the Related Art When a radio-controlled cassette recorder becomes large, it is equipped with a rod antenna so that radio reception in an area where electric field strength is weak is not hindered. However, in the case of a small-sized device, a rod antenna is usually not provided, and a connection terminal for an external antenna is not provided. Since it is difficult to capture a weak radio wave with this kind of boombox, only the broadcast of the local station can be received.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of this point. Even in a radio-cassette without a connection terminal for an external antenna (only a radio may be used) or the like, an external antenna is connected. An object of the present invention is to provide an antenna coupler capable of obtaining an approximate sensitivity.

[0004]

According to the present invention, as a means for solving the above-mentioned problems, according to the first aspect of the present invention, a coil is housed in a case, and the coil is provided in the case. And a terminal for antenna connection.

[0005] According to the invention described in claim 2, according to claim 1 of the present invention.
In the apparatus described in (1), means for attaching / detaching to / from another object is provided outside the case.

With such a configuration, by attaching the case to a case such as a boombox by attaching and detaching means, the bar antenna inside the boombox and the like and the coil of the coupler are inductively coupled at a high frequency. If an appropriate external antenna is connected to the coupler, a receiver such as a boombox can receive signals with high sensitivity. Since the coupler and the receiver such as a radio-cassette are connected by attaching / detaching means, the detector can be moved from outside the receiver to find an optimum position.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 4, reference numeral 1 denotes an external antenna coupler (hereinafter, referred to as a coupler) according to the present invention, and reference numeral 2 denotes a case formed of a synthetic resin. Case 2
Are formed integrally with the lower case 3 with the bolts 5 over the upper case 4. Inside this case 2,
As is clear from FIGS. 1 and 3, the coil 6 is accommodated near one side.

The coil 6 is formed by winding an insulated wire around a ferrite core 7 as shown in FIG. 5, and has a winding number suitable for the frequency of a radio wave to be received. 8 is a lead wire. The difference in length is that the terminal 9 described below is the case 1
This is because they are leaning to one side of. In FIG. 1 to FIG. 4, reference numeral 9 denotes a terminal, which is a RCA type jack having a hole for fitting a chip in the center, and connecting both ends of an external antenna at an outer peripheral portion insulated from the hole. The lead wires 8 at both ends of the coil 6 are connected to the terminal 9.

A bonding tape 10 is attached to the outside of the case 2 (the lower surface is shown in the figure, but may be the upper surface). This bonding tape 10 is generally widely used as a magic tape or Velcro fastener (both are registered trademarks), and a similar structure (not shown) is bonded to an appropriate portion of a receiver 11 such as a radio-cassette shown in FIG. By doing so, attachment and detachment of the coupler 1 becomes possible. This bonding site will be described later.

The method of use will be described. As shown in FIG.
A lead wire 13 from an appropriate loop antenna 12 is connected to the terminal 9 of the coupler 1. Various types of antennas can be considered depending on the frequency of the radio wave to be received. If the frequency to be received is in the range of medium waves, the loop antenna 12 or a simple vinyl wire as shown in the figure may be used. If so, a feeder antenna or an FM antenna mounted on a roof can be considered.

After the antenna is connected, the coupler 1 is moved to the upper center of the receiver 11 or the like. This allows
If the receiving sensitivity of the receiver 11 increases, the bar antenna 14 is provided inside that portion, so that the coupling tape is adhered to the upper surface thereof. After bonding the bonding tape, the coupler 1 with the bonding tape 10 bonded thereto can be attached at any time as needed. The reason why the receiving sensitivity is increased by bringing the coupler 1 closer to the receiving antenna in the receiver 11 is that high-frequency inductive coupling is performed.

[0012]

EXAMPLE A case was molded from a synthetic resin, and a ferrite core having a diameter of 6 mm and a length of 40 mm was placed inside the case with a wire diameter of 0.5 mm.
When the polyurethane wire of 60 mm was wound 60 times, a considerable gain could be obtained in reception in the medium wave band.

[0013]

Since the present invention is an external antenna coupler constructed as described above, it is applied to a relatively small receiver having neither a rod antenna nor an antenna connection terminal, and receiving with high sensitivity. You can do it. And since it can be easily attached to the receiver by the attaching / detaching means, it can be used only when necessary, and can be used for any receiver, which is extremely convenient.

[Brief description of the drawings]

FIG. 1 is a plan view showing the inside of an embodiment of the present invention.

FIG. 2 is a side view of a part of FIG.

FIG. 3 is a front view of FIG. 1 as viewed from the left.

FIG. 4 is a rear view of that of FIG.

FIG. 5 is a front view showing a single coil.

FIG. 6 is an explanatory diagram showing a use state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coupler 2 Case 5 Bolt 6 Coil 7 Ferrite core 9 Terminal 10 Coupling tape 11 Receiver 12 Loop antenna 13 Lead wire 14 Bar antenna

Claims (2)

[Claims] 1. An external antenna coupler wherein a coil is housed inside a case, and an antenna connection terminal provided on the case is connected to the coil. 2. The external antenna coupler according to claim 1, further comprising means for attaching / detaching to / from another object outside the case.