KR200226768Y1 - Mobile phone hands-free device for vehicle - Google Patents

Abstract

The present invention relates to a handsfree device for a mobile phone, and more particularly, to a mobile phone handsfree device for converting a voice output from a mobile phone into an infrared signal and transmitting it through a transmitter, and receiving the infrared signal with an earphone and an infrared receiver. .

According to the present invention, the external connection line of the infrared transmitter is plugged into the earphone jack of the cellular phone, and the infrared transmitter body is inserted into the cigar jack of the vehicle and installed. Then, while the infrared receiver (receiving earphone) is attached to the infrared transmitter, the receiver is automatically switched to receiving the incoming earphone when the receiver rings when the phone rings. can do.

Description

Mobile phone hands-free device {Mobile phone hands-free device for vehicle}

The present invention relates to a handsfree device for a mobile phone, and more particularly, to a mobile phone handsfree device for converting a voice output from a mobile phone into an infrared signal and transmitting it through a transmitter, and receiving the infrared signal with an earphone and an infrared receiver. .

Currently, many hands-free devices for vehicles are developed, which can be broadly classified into a wired type and a wireless type. The wired type connects an adapter with a microphone and a speaker to the auxiliary (AUX) connector of the cellular phone, and listens to the audio output from the cellular phone from the adapter and talks to the microphone of the adapter, just like a conventional speakerphone.

In the wireless system, a transceiver is attached to a cellular phone, and a user carries a second receiver, which receives the audio output from the cellular phone and speaks into the microphone of the transceiver. This is the way it is sent. In addition, there is also a method of wirelessly receiving the audio output from the mobile phone by frequency modulation (FM).

The streamlined type has the advantages of simple structure, low cost, and low breakdown, but there is a problem that obstructs driving because the microphone line must be installed in the vehicle for a long time. In addition, in the wireless type, electromagnetic waves are communicated by the communication between the cellular phone transceiver and the user side transceiver. Therefore, there is a danger of causing electromagnetic noise (EMI) to the ECU and other electronic devices. You may get confused with regular broadcasting.

In order to solve the above problems, the present inventors have a structure that does not generate any radio noise at all by using a generalized infrared communication method to transmit the voice signal between the mobile phone and the user, it is optimal for use in the interior of the vehicle In one structure, a hands-free device was devised.

Accordingly, an object of the present invention is to provide a mobile phone hands-free device for a vehicle configured to convert a voice output from a mobile phone into an infrared signal and transmit it through a transmitter, and receive the infrared signal into an infrared receiver and output the same to an earphone.

1 is a system configuration of an embodiment according to the present invention.

Figure 2 is an appearance configuration of an embodiment according to the present invention.

3A is a circuit diagram of an infrared transmitter.

3b is a circuit diagram of a receiving earphone.

<Explanation of drawing code>

Infrared transmitter 100, plug 102, low frequency amplifier (AF AMP) 104, volume control unit 106, infrared modulator 108, infrared amplification / transmitter 110, infrared diode 112, cigar jack (114), receiving earphone charging unit 116, receiving earphone 200, infrared transistor 202, infrared receiver 204, demodulator 206, low frequency amplifier 208, earphone 210, power supply 212 ), The reception switching unit 300, the reception switching switch 300a, the pressing plate 300b, the charging connection unit 302, the projecting terminal 302a, the metal plate 302b

Overview of the devise

Most modern phones have jacks for plugging in earphones. Earphones for mobile phones are equipped with a microphone and a reception switch. According to the present invention, the external jack of the infrared transmitter is plugged into the earphone jack, and the infrared transmitter body is inserted into the cigar jack of the vehicle and installed. Then, while the infrared receiver (receiving earphone) is attached to the infrared transmitter, the receiver is automatically switched to receiving the incoming earphone when the receiver rings when the phone rings. can do.

In the present invention, the microphone is connected directly to the earphone terminal of the cellular phone via an infrared transmitter for simplicity of the circuit. The user may install a microphone in a suitable position of the vehicle (for example, near a room mirror, near a driver's seat visor, etc.). The microphone is wired to the infrared transmitter, but there's not much inconvenience with the wire because it's always fixed. Rather, it is much cheaper and simpler to structure than a wireless microphone.

Example

1 shows a system configuration of a hands-free device according to the present invention, FIG. 2 shows an external configuration of the present invention, and FIGS. 3A and 3B show a circuit. Hands-free device according to the present invention is largely composed of the infrared transmitter 100 and the receiving earphone 200 and their coupling means.

Infrared transmitter configuration

The infrared transmitter 100 includes a plug 102 connected to the earphone / microphone jack of the cellular phone, a low frequency amplifier (AF AMP 104) for amplifying a sound signal from the cellular phone input through the plug 102, And an infrared modulator 108 for modulating the amplified sign tone signal for infrared transmission, and an infrared amplification / transmitter 110 for amplifying and transmitting the modulated infrared signal.

The low frequency amplifier 104 includes a volume control unit 106 for adjusting the volume of the sign language. Volume control unit 106 may be implemented by a variable resistor (VR) as shown in Figures 2 and 3a. In FIG. 3A, it can be seen that VR is connected to the voice input terminal IN.

The transmitter of the infrared amplification / transmitter 110 uses an infrared diode 112. Infrared diodes are widely used in electronic device remote controls and interrupt sensors.

As the infrared modulator 108, a commercially available IC may be used. Therefore, by adding only an external circuit to the infrared modulation IC, the size can be reduced, manufacturing cost can be reduced, and reliability can be increased.

On the other hand, the power supply unit of the infrared transmitter 100, the receiver earphone charging unit 116 for charging and supplying power to the cigar jack 114 and the receiving earphone 200 to obtain power from the battery and generator of the vehicle to be suitable for use in the vehicle ) Is included. The receiving earphone charging unit 116 sends out a voltage through P1 and P2 in FIG. 3A.

In addition, the microphone is connected directly from the earphone / microphone jack of the cellular phone and extended by a wire to the outside. As shown in FIG. 1, the microphone (MIC) wire can be installed to be installed at a suitable place in the car so that the user can easily use it. 2 shows an example in which the infrared diode 112 is provided in the body of the microphone MIC. Since the microphone is generally installed near the user's mouth and the receiving earphone 200 is used by being plugged into the user's ear, it is advantageous to install the infrared diode 112 close to the microphone body for communication. However, the position of the infrared diode is not limited thereto.

Receive earphone configuration

The receiving earphone 200 includes an infrared receiver 204 for receiving an infrared signal transmitted from the infrared diode 112 of the infrared transmitter, a demodulator 206 for extracting original voice from the received infrared signal, and a voice signal. The low frequency amplifier 208 to amplify, and the earphone 210 for reproducing the amplified voice signal.

The infrared receiver 204 may receive infrared rays using a phototransistor, a photodiode 202, or the like. 2 shows an example in which the infrared transistor 202 is attached to a protrusion formed like an antenna. The demodulator 206 may be configured by a commercially available ready-made IC, and the earphone 210 may use a magnet method or a crystal method. 2, it can be seen that the earphone 210 protrudes to a size that can be inserted into the ear.

On the other hand, the power supply unit 212 of the receiving earphone 200 is charged by the receiving earphone charging unit 116 of the infrared transmitter 100. Small NiCd batteries may be used.

Receiving earphone 200 is produced in a small size as shown in Figure 1 can be used directly plugged into the user's ear, it is preferable to produce not heavy. According to the present invention, since the receiver earphone 200 only receives a signal from the infrared transmitter 100, the size of the battery may be small or there is no transmission circuit, thereby simplifying the overall circuit configuration. An example of the appearance configuration of the receiving earphone 200 is shown in FIG. 2.

Combined structure of infrared transmitter and receiver earphone

The coupling structure of the infrared transmitter 100 and the receiving earphone 200 is made by the charging connection unit 302 and the reception switching unit 300 shown in FIG. 1, and is made as shown in FIG.

The charging connection unit 302 serves to contact the receiving earphone charging unit 116 of the infrared transmitter 100 and the power supply unit 212 of the receiving earphone 200 when the receiving earphone 200 is placed on the infrared transmitter 100. To do. 2, the protruding terminal 302a is provided on the infrared transmitter 100 side, and the metal plate 302b is provided at the corresponding position of the receiving earphone 200. As shown in FIG. Therefore, when the reception earphone 200 is placed on the infrared transmitter 100 in the normal standby, the protruding terminal 302a and the metal plate 302b contact each other, and the power from the vehicle is supplied to the power supply unit 212 of the reception earphone 200. It is charged. 3A and 3B, when P3 and P4 are connected to each other, the voltage from the receiver earphone charging unit 116 of the infrared transmitter 100 is applied to the battery of the receiver earphone 200 to be charged.

The reception switching unit 300 serves to switch to a reception state when the cellular phone rings in a waiting state of reception. Since a line for receiving a switching switch is provided at the earphone / microphone terminal of the cellular phone, a receiving switching switch 300a is installed on the infrared transmitter 100 side as shown in FIG. 2, and a pressing plate 300b is provided at a corresponding position of the receiving earphone 200. Install). Under this structure, when the reception earphone 200 is placed on the infrared transmitter 100, the reception switch 300a is pressed, and when the reception earphone 200 is lifted to receive the call, the reception switch 300a returns. The state is switched.

2 shows an example of the charging connection unit 302 and the reception switching unit 300, but this can be implemented in various ways. For example, the charging connection unit 302 may be implemented by an insert connector method, and the reception switching unit 300 may be implemented as a magnet reed switch instead of a push switch. In addition, it is preferable to use a magnet, a mechanical device, or the like so that the receiving earphone 200 is completely attached to the infrared transmitter 100 in a shaking vehicle.

How to use

The use method of the present invention is configured as described above can be inferred from the description of the operation already described, but summarized as follows.

1) Insert the cigar plug 114 into the cigarette lighter jack in the car, shape the microphone wire and install the microphone in an appropriate place (for example, attach it to a room mirror or a driver's seat sun visor).

2) Insert the plug of the infrared transmitter 100 into the earphone / microphone terminal of the mobile phone. The mobile phone is mounted at an appropriate position (for example, a separate holder or a suitable storage space).

3) The receiving earphone 200 is put on the receiving standby so as to be connected to the charging connection unit 302 and the receiving switching unit 300 of the infrared transmitter 100.

4) When the cell phone rings, pick up the incoming earphone 200 and plug it into your ear. At this time, the reception earphone 200 is operated by the power charged by the charging connection unit 302, and the mobile phone is switched to the reception state by the reception switching unit 300.

5) The user listens to the handset sound from the incoming earphone 200 which is plugged into the ear and makes a mobile phone call while inputting his or her own voice into the microphone. At this time, the near field communication by the infrared signal is made between the infrared transmitter 100 and the receiving earphone 200.

6) After the call is finished, if the receiver earphone 200 is placed on the infrared transmitter 100 again, the reception switching unit 300 switches the reception state of the mobile phone to the standby state, and the reception earphone 200 is connected to the charging connection unit ( 302) to a charged state.

According to the present invention, by implementing an in-vehicle mobile phone hands-free device by infrared rays, it is possible to eliminate the problem of electromagnetic noise and the inconvenience in use by wires. In addition, since the earphone only receives the infrared signal, the battery and all the parts can be miniaturized, which is convenient to use and easy to manufacture, thereby reducing the cost.

Claims (6)

A hands-free device that is applied to a mobile phone in which an earphone / microphone jack including a reception switch line and an earphone line and a microphone line for connecting a mobile phone to a reception state is provided. A plug 102 connected to the earphone / microphone jack of the cellular phone, a low frequency amplifier 104 for amplifying the cellular phone receiver sound input from the earphone line of the earphone / microjack of the cellular phone via the plug 102; An infrared modulator 108 for modulating the amplified sign tone signal for infrared transmission, an infrared amplification / transmitter 110 for amplifying and transmitting the modulated infrared signal, and a cigar jack 114 for obtaining power from a battery and a generator of the vehicle And an infrared transmitter 100 configured to be connected to a microphone line of an earphone / microphone jack of a mobile phone, and a receiver earphone charging unit 116 for supplying and charging power to the receiver earphone 200, An infrared receiver 204 for receiving an infrared signal transmitted from the infrared amplification / transmitter 110 of the infrared transmitter 100, a demodulator 206 for extracting an original voice from the received infrared signal, and an extracted voice; A receiving earphone comprising a low frequency amplifier 208 for amplifying a signal, an earphone 210 for reproducing an amplified voice signal, and a power supply 212 charged by the receiving earphone charging unit 116 of the infrared transmitter 100. 200, The charging connection unit 302 which charges the power supply unit 212 of the receiving earphone by contacting the receiving earphone charging unit 116 of the infrared transmitter 100 and the receiving earphone 200, A mobile phone hands-free device for a vehicle, comprising: a reception switching unit 300 connected to a reception switching switch line of an earphone / microphone terminal of the mobile phone in order to switch the mobile phone from a standby state to a reception state. The vehicle hands-free device for a vehicle according to claim 1, wherein the low frequency amplification unit (104) of the infrared transmitter (100) includes a volume control unit (106) for adjusting the volume of a sign language sound. In claim 1, the transmitting end of the infrared amplification / transmission unit 110 of the infrared transmitter 100 is made of an infrared diode 112, the infrared diode 112 is characterized in that installed in the body of the microphone (MIC) Car mobile phone handsfree device. In claim 1, Earphones 210 of the receiving earphone 200 is a mobile phone hands-free device for a vehicle, characterized in that formed to protrude to a size that can be inserted into the ear. In claim 1, the charging connection unit 302 is composed of a protruding terminal 302a provided on the infrared transmitter 100 side, and a metal plate 302b provided at the corresponding position of the receiving earphone 200, When the reception earphone 200 is placed on the infrared transmitter 100 at the reception standby, the protruding terminal 302a and the metal plate 302b contact each other so that the power from the vehicle is charged in the power supply unit 212 of the reception earphone 200. In-vehicle mobile phone hands-free device, characterized in that. In claim 1, the reception switching unit 300 is composed of a reception switching switch 300a installed on the infrared transmitter 100 side, and the pressing plate 300b installed at the corresponding position of the receiving earphone 200, The mobile phone hands-free device for a vehicle, characterized in that when the reception earphone 200 is placed on the infrared transmitter 100 and the reception earphone 200 is lifted up, the reception switching switch 300a operates to switch the cellular phone to a reception state. .