JP2003152606A - Magnetic communication apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic communication apparatus in which a space for integrating a transmitting/receiving antenna coil is decreased and the costs of the transmitting/receiving antenna coil can be reduced in the magnetic communication apparatus to be provided in equipment such as a portable telephone set having a speaker. SOLUTION: A magnetic material 40 for high frequency for magnetic communication is added to a pole piece 32 of the speaker, a voice coil 30 is operated as an acoustic coil. This voice coil 30 is operated as a communication antenna coil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic communication device for transmitting a communication signal from a transmitting section as a magnetic field from a transmitting antenna coil, and a receiving section receiving the magnetic field at a receiving antenna coil to process the communication signal. The present invention is characterized in that the above-mentioned transmitting antenna coil and receiving antenna coil are provided in the acoustic unit.

[0002]

2. Description of the Related Art FIG. 9 shows a basic configuration example of a magnetic communication device. As illustrated, the communication signal transmitted from the transmission / reception unit 10 is generated as a modulated magnetic field by the antenna coil 11 of the transmission / reception unit 10, and the magnetic field 12 is transmitted. Then, in the transmitting / receiving unit 20, the antenna coil 21 electromagnetically induced by the magnetic field 12 receives the communication signal and processes the signal.

The same applies when transmitting from the transmitting / receiving section 20, and a communication signal is transmitted as a modulated magnetic field from the antenna coil 21 and received by the antenna coil 11 of the transmitting / receiving section 10. The antenna coils 11 and 21 are adjacently arranged with a small interval.

The magnetic communication device as described above, which communicates by using a magnetic field as a transmission / reception medium, is provided in an IC card information reading device and the like, as is widely known, but recently, it has been used in various portable devices, for example, various devices. Incorporating the magnetic communication technology into mobile phones has been actively developed.

Since the mobile phone has come to be used as a multifunctional information terminal as well as a dialog, it has many advantages by incorporating the above magnetic communication technology.

[0006]

When the magnetic communication technology is incorporated in a mobile device such as a mobile phone, a special housing for installing a dedicated transmitting / receiving antenna coil is required in order to install a dedicated transmitting / receiving antenna coil. Therefore, a space for incorporating the transmission / reception antenna coil is required, which causes a problem in reducing the size and weight of the mobile device.

In view of the above-mentioned circumstances, the present invention reduces the space required for installing a magnetic communication device in a device such as a mobile phone as much as possible by providing an acoustic unit with a transmitting / receiving antenna coil, and also, An object of the present invention is to provide a magnetic communication device adapted to reduce the cost of an antenna coil.

[0008]

In order to achieve the above object, the present invention provides, as a first invention, a voice coil provided around a pole piece, and an audio signal supplied to the voice coil. In a magnetic communication device of a device provided with an acoustic unit having a vibrating diaphragm,
A high-frequency magnetic material for magnetic communication is added to the pole piece, the voice coil is operated as an acoustic coil, and the voice coil is operated as a communication antenna coil. A magnetic communication device is proposed.

The magnetic communication device according to the first aspect of the present invention can perform communication using the voice coil as a communication antenna coil.

That is, when a high-frequency communication signal is supplied to the voice coil, the communication signal is generated as a magnetic field by the action of the voice coil and the high-frequency magnetic material. send.

Further, when the magnetic field of the communication signal is sent, the voice coil receives this magnetic field as the communication antenna coil, so that the communication signal sent from the voice coil can be processed by the receiving unit.

If an audio signal in the audible frequency band is supplied to the voice coil, the acoustic unit can be operated as a normal speaker.
Can be pronounced as.

As a second aspect of the present invention, an acoustic unit having a voice coil provided around the pole piece and a diaphragm vibrating according to an audio signal supplied to the voice coil is provided. In a magnetic communication device of a device, a high-frequency magnetic material for magnetic communication is added to the pole piece, and a communication antenna coil is provided around the pole piece together with a voice coil. A magnetic communication device is provided which is provided with a voice coil for acoustic operation and a communication antenna coil for transmission and reception.

In the second aspect of the invention, since the voice coil and the communication antenna coil are provided around the pole piece, the communication antenna coil causes the communication signal magnetic field to be emitted and received, and the voice coil receives the voice signal. Can be supplied to produce sound.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment in which the present invention is applied to a speaker (acoustic unit) provided in a mobile phone will be described with reference to the drawings.

1 to 3 are sectional views of a moving coil type speaker in which a voice coil is also used as a communication antenna coil. In these drawings, 30 is a voice coil wound around a bobbin in a coil shape.
0 is fixed to the central portion of the conical diaphragm 31 together with the bobbin.

Reference numeral 32 is a pole piece protruding into the voice coil 30. The pole piece 32 forms a magnetic path by the yoke plates 33 and 34 and the ring-shaped magnet 35 to vibrate the vibrating plate 31 to produce an acoustic sound.

In addition, 36 is a damper and 37 is a frame.
A reference numeral 38 denotes a center cap provided as needed. Each of the above-mentioned members 30 to 38 constitutes a speaker as an acoustic unit.

On the other hand, the above-mentioned speaker is provided with a high frequency magnetic material 40 for magnetic communication. The magnetic body 40 effectively enhances the magnetic field generated by supplying the voice coil 30 with a high-frequency communication signal that is higher than the frequency band (audible frequency band) of the audio signal.

Specifically, the speaker shown in FIG. 1 has a structure in which a magnetic material 40 for high frequency is embedded in the pole piece 32.

In the speaker shown in FIG. 2, the high frequency magnetic material 40 is elongated and one side portion thereof is a pole pull.
It is embedded in the space 32, and the other side portion is projected from the pole piece 32. By providing the magnetic body 40 in this way, the magnetic field for communication can be strengthened.

Further, the speaker shown in FIG. 3 has a structure in which a magnetic material 40 for high frequency is fixed to the upper end of the pole piece 32. With such a configuration, manufacturing workability can be improved.

Each of the above-mentioned speakers is a voice coil 3
0 is used as a communication antenna coil in addition to the acoustic coil. FIG. 4 is a voice coil 30 of the speaker shown in FIG.
FIG. 3 is a circuit block diagram showing a configuration example in which is used as a communication antenna coil.

As shown in the figure, in this configuration example, a changeover switch 50 is provided, and by this changeover switch 50, an acoustic mode for supplying the voice signal of the voice signal generating section 51 to the voice coil 30 and the communication of the transmitting / receiving section 52. A signal is supplied to the voice coil 30 and a communication mode for inputting a communication signal from the voice coil 30 is switched.

The transmitting / receiving section 53 and the antenna coil 54 shown in the figure are the same as the transmitting / receiving section 10 and the antenna coil 11 shown as a conventional example. The changeover switch 50 can also be configured as a semiconductor switch.

With this configuration, when the changeover switch 50 is turned on at the terminal a, a voice signal is supplied to the voice coil 30 and the speaker operates as an acoustic sounding body.

When the changeover switch 50 is turned on at the terminal b, the communication signal output from the transmitter / receiver 52 is sent to the voice coil 30, and the voice coil 30 generates a magnetic field 55 as a communication antenna coil. Therefore, a communication signal can be sent to the transmitting / receiving unit 53 which is received by the communication antenna coil 54.

Further, in this communication mode, when a communication signal is transmitted from the transmission / reception section 53, the voice coil 30 receives the transmission magnetic field as a communication antenna coil and sends the reception signal to the transmission / reception section 52.

FIG. 5 shows the changeover switch 5 of the above-mentioned configuration example.
In place of 0, a high frequency cutoff circuit 56 is provided in the audio signal supply path, and the audible band cutoff circuit 5 is provided in the transmission / reception path of the transmission / reception unit 52.
7 is provided.

According to this structure, when the transmitting / receiving section 52 is operated in the acoustic mode in which the voice signal is supplied to the voice coil 30, the voice signal is converted into the audible band cutoff circuit 5.
7 and the communication signal is cut off by the high-frequency cutoff circuit 56, so that the operations of the voice signal generator 51 and the transmitter / receiver 52 are not affected.

That is, while a voice signal is supplied to the voice coil 30 to acoustically operate the voice coil 30, a communication signal is supplied to the voice coil 30 to operate as a transmitting antenna coil, and the voice coil 30 is also operated. Can be operated as a receiving antenna coil. The low frequency included in the received signal can be blocked by the receiving unit.

As described above, since magnetic communication can be performed between the transmitting / receiving sections 52 and 53 via the voice coil 30, a transmitting antenna coil and a receiving antenna coil for magnetic communication are not required. In addition, the speed of FIG. 1 and FIG.
The car can also be configured in the same manner as the circuit block described above.

FIG. 6 shows another embodiment in which the communication antenna coil 60 is provided separately from the voice coil 30.
With this configuration, the communication antenna coil 60 can be formed with the optimum number of turns for magnetic communication. The other construction is the same as that of FIG.

FIG. 7 shows an embodiment in which the communication antenna coil 61 and the voice coil 30 are wound with a conductive wire having the same wire diameter, and the other parts have the same speaker structure as in FIG. In the case of such a configuration, the communication antenna coil 6
1 and the voice coil 30 are wound on the same bobbin, and a part of the winding is formed as an intermediate tap.

That is, as shown in FIG. 8, the voice coil 30 is connected to the coil portion 70b on one side from the intermediate tap 70a.
The coil portion 70c on the other side is formed as the communication antenna coil 61. With this configuration, the coil portion 70c can be formed with the number of turns suitable for magnetic communication.

As described above, the communication antenna coils 60, 6
By separately providing 1 for the voice coil 30, it is possible to have a circuit configuration in which the voice signal generating unit and the transmitting / receiving unit are independent, which is advantageous in circuit arrangement and built-in space. Communication antenna coils 60 and 6 configured in this way
1 can be similarly provided for the speaker shown in FIGS.

Although the embodiment of the moving coil type loudspeaker of the present invention has been described above, the present invention is not limited to the loudspeaker having a fixed voice coil and other acoustic units. The same can be applied to the device.

Also in this configuration example, in addition to selectively operating the voice coil 30 and the communication antenna coils 60 and 61, transmission and reception are performed using the communication antenna coils 60 and 61 during the acoustic operation of these voice coils 30. can do.

[0039]

As described above, according to the present invention, since the voice coil of the acoustic unit is also used as the communication antenna coil, and the communication antenna coil is provided integrally with the voice coil, transmission / reception for magnetic communication is performed. The antenna coil can be incorporated into the acoustic unit.

As a result, the space for incorporating the transmitting antenna coil and the receiving antenna coil can be reduced as much as possible as a magnetic communication device for a device having an acoustic unit, and the magnetic communication device is suitable for low cost of the antenna coil. Becomes

[Brief description of drawings]

FIG. 1 is a sectional view of a speaker showing an embodiment in which a voice coil is also used as a communication antenna coil.

FIG. 2 is a cross-sectional view of a speaker similar to FIG. 1 showing another embodiment.

FIG. 3 is a cross-sectional view of a speaker similar to FIG. 1 showing still another embodiment.

FIG. 4 is a circuit block diagram showing a configuration example in which magnetic communication is performed using the voice coil of the speaker described above.

FIG. 5 is a circuit block diagram similar to FIG. 4, showing another configuration example for magnetic communication.

FIG. 6 is a cross-sectional view of a speaker showing an embodiment in which a communication antenna coil is attached to a voice coil.

FIG. 7 is a cross-sectional view of a speaker similar to FIG. 6, showing another embodiment in which a communication antenna coil is attached to a voice coil.

8 is a perspective view of the voice coil and the communication antenna coil shown in FIG. 7, showing the winding state of the coil.

FIG. 9 is a diagram showing a basic configuration example of a magnetic communication device.

[Explanation of symbols]

30 voice coils 31 diaphragm 32 Pol Pace 40 Magnetic material for high frequency 50 Changeover switch 51 Audio signal generator 52 Transmitter / receiver 53 Transmitter / receiver 54 antenna coil 60 communication antenna coil 61 Communication antenna coil

Claims (2)

[Claims] 1. A magnetic communication device of a device, comprising: an acoustic unit having a voice coil provided around a pole piece and a diaphragm vibrating in accordance with an audio signal supplied to the voice coil. A high frequency magnetic material for magnetic communication is additionally configured in the pole piece, and the voice coil is operated as an acoustic coil.
A magnetic communication device characterized in that the voice coil is operated as a communication antenna coil. 2. A magnetic communication device of a device comprising an acoustic unit having a voice coil provided around a pole piece and a diaphragm vibrating in accordance with an audio signal supplied to the voice coil. A high-frequency magnetic material for magnetic communication is additionally configured in the pole piece, and a voice antenna and a communication antenna coil are provided around the pole piece so that the voice coil can be operated acoustically. A magnetic communication device having a structure for transmitting and receiving by a communication antenna coil.