JPS62284503A - Auxiliary antenna for small-sized receiver - Google Patents

Abstract

PURPOSE:To prevent the portability of a small-sized receiver from being spoiled while efficiently improving the reception sensitivity without providing any electric contact connecting with an internal antenna by mounting components except an external antenna on a fastener. CONSTITUTION:A connector 11 which connects the external wire antenna 10, a ferrite core 12 which couples the external wire antenna 10 with the internal antenna 6 electrically, a trimmer capacitor 13 which tunes the external wire antenna 10 to the internal antenna 6, and an earth plate 14 to which the ground part of an auxiliary antenna circuit formed of respective members is connected are incorporated in an arm 4. Consequently, the portability of the compact, small-sized receiver is not spoiled and the receiver is coupled electromagnetically with the internal antenna by a pickup coil, so the reception sensitivity is improved efficiently without providing any electric contact connecting with the internal antenna of the small-sized receiver.

Description

Detailed Description of the Invention 8. Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to an auxiliary small receiver having a detachable fastener attached to the main body and an internal antenna inside the main body. The present invention relates to an antenna, and more particularly to an auxiliary antenna for a small receiver that is electromagnetically coupled to the internal antenna to improve the sensitivity of the small receiver.

(Prior art) Generally, a small receiver is equipped with an internal antenna inside the main body, but it is difficult to obtain sufficient sensitivity with this internal antenna alone, so an auxiliary antenna is installed outside the main body. things are being done.

Conventional auxiliary antennas of this type include external antennas that have a connector on the small receiver body and connect directly to the internal antenna through this connector, and auxiliary antenna equipment that is separate from the small receiver. Next, there is a built-in auxiliary antenna that is fully electromagnetically coupled to the internal antenna of a small receiver.

(Problems to be Solved by the Invention) Among the above-mentioned conventional auxiliary antennas, which one is the connector? If the small receiver is configured to connect directly to the internal antenna through the connector, it will have an electrical contact in the connector part, and if the internal circuit of the small receiver uses elements that are sensitive to static electricity, the reception may be affected by noise. There was a risk that the sensor whose sensitivity had deteriorated or its element would be damaged. However, in the case of an auxiliary antenna device that is separate from the small receiver, there is a problem that the structure becomes large and the portability of the small receiver is impaired.The present invention solves all of the above problems. This design has been carefully designed to efficiently improve reception sensitivity without having to make electrical contact with the internal antenna of the small receiver, and is compact enough to not impair the portability of the small receiver. The purpose is to provide an auxiliary antenna for a compact receiver.

(Measures to Solve All Problems) In order to achieve the above object, the present invention provides an auxiliary compact receiver having a right-hand armable fastener on the main body and an internal antenna metal inside the main body. In the antenna, an external antenna, a pickup coil for electromagnetically coupling the external antenna with the internal antenna, a variable capacitor arranged at e14 between the external antenna and the internal antenna, and t=VL. , all of the structural members other than the external antenna are attached to the fastener, and the ground air portion is provided to the fastener.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1(a) is a top view showing the external appearance of the auxiliary antenna of the small receiver according to this embodiment, and FIG. 1(b) is the internal structure of the same antenna. 2(a) and 2(b) are perspective views showing the external structure of the small receiver, and FIG. 3 is an explanatory diagram of an electric circuit.

As shown in FIGS. 2(a) and 2(b), the small receiver to which the auxiliary aerial edge according to this embodiment is applied has a receiver main body 1
Equipped with a lip holder type fastener 2 that can be attached and detached freely.
It is something. The clasp 2 has a clasp body 3 that is attached to the receiver body 1.
The arm 4 is rotatably attached to the support portion 3a4 of the fastener main body 3, so that the fastener body 3 can be elastically fitted to the outside in a tight state. Note that the arm 4 is biased by a spring (not shown), so that a clip structure is formed between the arm 4 and the receiver main body 1. Man, is there a receiving circuit inside the receiver body 1? An internal antenna 6 is built in together with the circuit board 4L5 to be formed.

Then, as shown in FIG. 1(b), on the arm 4,
External wire antenna 107 Connector 11 to connect, ferrite core (pickup coil) 12 to electromagnetically couple external wire antenna 10 and internal antenna 6
, a trimmer capacitor (variable capacitor) 13 for tuning between the external wire antenna 10 and the internal antenna 6;
A grounding plate 14 to which the ground portion of the auxiliary antenna circuit formed by these members is connected is incorporated.

That is, the connector 11 and the trimmer capacitor 13 are installed in the base end of the arm 4 in an internal space, and the ferrite core 12 is installed in the middle part of the arm 4 so as to face the internal antenna 6. The ground plate 14 is installed along the back of the arm 4.

The electrical circuit configuration of each of the above members is as shown in FIG. That is, the ferrite core 12 and the trimmer capacitor 13 are connected in parallel, the ground plate 14 is connected to the terminal end thereof, and the connector 11 is connected to the ferrite core 12 to form a nine-circuit configuration.

As described above, each of the auxiliary antenna intercepting members (excluding the external wire antenna 10) are incorporated into the fastener 2 as described below, so that the compactness and portability of the small radio device are not completely compromised.
Sensitivity can be improved by using the external wire antenna 10.

Since the coupling between the external wire antenna 10 and the internal antenna 6 is electromagnetic coupling via the ferrite core 12, the circuit elements of the small radio are not damaged by static electricity or the like. Furthermore, the external wire antenna 10'
! ! - Since it is removable, it can be removed and carried as needed, making it even more effective in terms of portability.

Note that the ground plate 14 also has the function of increasing the strength of the arm 40.

FIGS. 4(a) and 4(b) show a modification of the above-mentioned auxiliary antenna.

That is, a housing 11s3b (z) is provided in the main body 3 of the fastener 2, a ferrite core 12, a trimmer capacitor 13, and a ground [14] are contained within this housing s3b, and a connector 1i is attached 1412.

It should be noted that the electrical circuit interception is as shown in FIG. 3, as in the above-mentioned embodiment.

Even with such a configuration, the same effects as in the above-mentioned embodiment can be achieved.

It should be noted that the present invention is not limited to the above-mentioned embodiments or modified examples. For example, the external antenna may be directly connected to the pickup coil without using a connector. It is also possible to use a configuration in which the earth part is connected to a fastener and grounded without using a hole or a grounding plate. Furthermore, various small receivers with fasteners are targeted, and fasteners with various structures are also targeted.

(Effects of the Invention) As explained above, the present invention incorporates structural materials other than the external antenna into the fastener equipped on the small receiver, so that the portability of the compact receiver is not completely compromised. Moreover, since the pickup coil is configured to be electromagnetically coupled to the internal antenna, there is no electrical contact between the small receiver and the internal antenna, and the reception sensitivity can be efficiently improved.

[Brief explanation of the drawing]

FIG. 1(a) is a top view showing the external appearance of the auxiliary antenna antenna of a small receiver according to an embodiment of the present invention, FIG. 1(b) is a longitudinal sectional view showing the internal structure of the auxiliary antenna, and FIG. Figures (a) and (b) show the external structure of the small receiver, and figure (a) shows the clasp. FIG. 3 is a perspective view showing a state in which the fastener is attached. FIG. 3 is an explanatory diagram of an electric circuit. FIGS. 4 (a) and (b) are modifications of the present invention. An example is shown in which FIG. 11(a) is a partially cutaway top view and FIG. 6(b) is a longitudinal cross-sectional view. 1... Receiver body 2... Fastener 3... Fastener body 4... Arm 5... Circuit board
6... Internal antenna 10... External wire antenna 11... Connector 12... Ferrite core (pickup coil) 13
・・・Trimmer capacitor (variable capacitor) 14...Earth plate Patent applicant: NEC Co., Ltd. Representative Patent attorney Hisashi Inoro Fig. 21 (a) Fig. 2 (a) Fig. 3 Fig. 6 (inner pipe FT type) )

Claims (2)

[Claims] (1) An auxiliary antenna for a small receiver having a detachable fastener attached to the main body and an internal antenna inside the main body, the external antenna being electromagnetically coupled to the internal antenna. and a variable capacitor for tuning between the external antenna and the internal antenna, and a component other than the external antenna is attached to the fastener, and the An auxiliary antenna for a small receiver, characterized in that it is provided on the fastener. (2) The auxiliary antenna for a small receiver according to claim 1, wherein the external antenna is removable.