JP2005176286A - Handsfree apparatus for portable telephone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a handsfree apparatus for portable telephones which is small-sized, light, and inexpensive. <P>SOLUTION: This is a handsfree apparatus for enabling a driver to make a handsfree telephone conversation using a portable telephone 1 in a car, and is provided with a handsfree apparatus body 2 which can be attached to the speaker portion 10 of the portable telephone 1 easily by the use of a clip 25, a microphone 20 provided in the body 2, an oscillator 21, and an FM modulation means 22. The body 2 has a function of transmitting by radio through the use of an FM carrier, a received sound signal from a telephone conversation partner received by the portable telephone 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hands-free device for a mobile phone that allows a driver of a car to talk without gripping the mobile phone.

When driving a car, making a call with a mobile phone is a one-handed operation, which is extremely dangerous.
For this reason, various hands-free devices have been developed that allow a driver to make a phone call without driving with one hand (see, for example, Patent Documents 1, 2, and 3).
Japanese Patent Laid-Open No. 11-17793 Japanese Patent Laid-Open No. 11-59283 JP 2002-118635 A

However, the conventional hands-free device is complicated and expensive, and has to be incorporated in a car in advance.
In addition, it is necessary to connect the mobile phone with a cable, which is a cumbersome work for the driver who gets into the car and immediately leaves the car, and it is necessary to remove the mobile phone from the cable when getting out of the car. In some cases, the mobile phone may be left in the car.
Furthermore, routing the cable around a narrow driver's seat in the vehicle may hinder driving.
Moreover, the headset type thing provided with the microphone and the headphone has to attach the headset during driving, which is troublesome.

The present invention has been conceived in view of the above-described conventional problems, and an object thereof is to provide a small, lightweight, and inexpensive hands-free device for a mobile phone.
It is another object of the present invention to provide a hands-free device for a mobile phone that can easily connect the mobile phone to the hands-free device with one touch without requiring a complicated operation.
Another object of the present invention is to provide a hands-free device for a mobile phone that does not route a cable around the driver's seat.

  In order to achieve the above object, a hands-free device for a mobile phone according to the present invention is a hands-free device for a driver to perform a hands-free call using a mobile phone in a car. A hands-free main body that is attached to the hand-free device via a clip, and a microphone, an oscillator, and FM modulation means provided on the hands-free main body. This is characterized in that it has a function of wirelessly transmitting a radio wave using an FM carrier wave.

The effect | action by the said problem-solving means is as follows.
Attach the microphone of the hands-free body to the earpiece of the mobile phone, and turn on the power of the hands-free body.
The hands-free main body has a function of wirelessly transmitting the received voice signal from the other party received by the mobile phone using the FM carrier wave. For example, the received voice signal of the other party is sent to the car stereo equipped in the automobile. Can be transmitted on the FM carrier.
In the car stereo, the receiving process is performed by the FM demodulating means, and the received voice from the other party is reproduced from the speaker of the car stereo.

Since the present invention has been described above, the following effects can be obtained.
<A> There is no need to install an expensive hands-free device in a car, and a small and lightweight hands-free main body can be simply attached to the earpiece of a mobile phone by holding it with a clip.
<B> As described above, since it can be easily attached just by pinching the earpiece of the mobile phone, there is no troublesome connection with a cable or the like.
<C> A car equipped with a car stereo capable of receiving FM carrier waves can be easily used anytime and anywhere.

Embodiments according to the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a state in which a hands-free main body is attached to a mobile phone. FIG. 2 is a side view of the hands-free body. FIG. 3 is a block diagram showing the relationship between the mobile phone, the hands-free main body, and the car stereo, and FIG. 4 is an explanatory diagram showing the state of use.

<A> Overall Configuration FIGS. 3 and 4 show configuration examples when the mobile phone hands-free device of the present invention is used in an automobile.
A hands-free main body 2 is attached to the mobile phone 1 and wireless transmission is performed between the hands-free main body 2 and the car stereo 3.
The mobile phone 1 is a normal type having an earpiece 10 and a mouthpiece 11.

<B> Hands-free body The hands-free body 2 includes a microphone 20, an oscillator 21, FM modulation means 22, an amplifier 23, and a transmission antenna 24.
The microphone 20 converts call voice from a call partner into an electrical signal, and corresponds to the earpiece 10 when the hands-free main body 2 is attached to the mobile phone 1 as shown in FIG.
The oscillator 21 generates a predetermined carrier frequency, in this example, a carrier frequency (weak FM radio wave) of FM 88.9 MHz.
The FM modulation means 22 is, for example, a mixing circuit or the like, and synthesizes the electric signal from the microphone 20 and the weak FM radio wave from the oscillator 21 and performs FM modulation. The FM modulation means 22 converts the FM signal from the transmission antenna 24 to FM88.9 MHz. Wireless transmission is performed toward the car stereo 3 with weak FM radio waves (see FIG. 3).
That is, the hands-free main body 2 converts the received voice into an electric signal, generates a weak FM radio wave of FM 889 MHz by the oscillator 21, and outputs the electric signal as an FM carrier wave.
The hands-free main body 2 is small and lightweight so as to be attached to the mobile phone 1, and can be easily attached to the mobile phone 1 with a clip 25 with one touch.
The clip 25 may use a torsion spring and a pressing plate used for, for example, stationery, and one end of the pressing plate is in contact with the microphone 20 in a normal state where the clip 25 is not attached to the mobile phone 1 (see FIG. 2).
The hands-free main body 2 is supplied with power by a built-in battery (not shown), and a power switch 26 is provided on the side surface.

<C> Car Stereo The car stereo 3 is a system including at least an FM tuner 30, an amplifier 31, and a speaker 32, and has a wireless system capable of short-range wireless communication with the hands-free main body 2 using FM carriers.
Since the car stereo 3 usually has a tuning circuit for tuning to an FM radio wave having a predetermined frequency from the received radio wave, the frequency of the received radio wave is set to FM88.9 cycles by, for example, an adjustment knob. Thus, the FM carrier wave from the hands-free main body 2 can be received.
The car stereo 3 includes a receiving antenna 33 and an FM demodulating unit 34, and a weak FM radio wave (electric signal of received voice) received by the receiving antenna 33 is demodulated by the FM demodulating unit 34. It is played and becomes a call voice and is heard by the driver.
Reference numeral 35 denotes a switching knob for selectively switching the FM tuner 30, the CD device 36, and the FM demodulation means 34.

<F> Action The hands-free main body 2 is attached to the mobile phone 1 so that the microphone 20 and the earpiece 10 correspond to each other, and the power switch 26 is pressed to turn on the power. The power supply may be turned on when there is an incoming call to the mobile phone 1.
The frequency of the received radio wave is set to FM88.9 cycle with the adjustment knob of the car stereo 3, and this is stored.
Moreover, as shown in FIG. 4, the mobile phone 1 with the hands-free main body 2 attached is placed around the driver's seat such as a dashboard.
When the mobile phone 1 receives an incoming call and switches to a call state, the call voice from the earpiece 10 is transmitted to the microphone 20 of the hands-free main body 2.
The voice is converted into an electric signal by the microphone 20, and this electric signal is synthesized with the weak FM radio wave (FM88.9) generated by the oscillator 21 by the FM modulation means 22, and the received voice signal is hands-free as an FM carrier from the transmission antenna 24. It is transmitted from the main body 2 to the car stereo 3.
At this time, when the driver is listening to the CD or the car radio, the FM switch 34 is switched by the changeover switch 35 so that the FM radio wave (FM88.9) can be received.
As a result, the sound of the car stereo 3 is switched to the call voice from the call partner, so that a hands-free call with the call partner can be performed while listening to the call sound reproduced from the speaker 32.
When the mobile phone 1 is turned off and the power switch 26 of the hands-free main body 2 is turned off at the same time after the communication is completed, the transmission of the FM carrier wave is stopped.
Thereafter, the changeover switch 35 can be switched to listen to music on a car radio or a CD.

As described above, according to the present invention, even when the car stereo 3 is being listened to or the hand cannot be released while the car is being driven, the mobile phone 1 can be obtained only by the outgoing / incoming operation of the mobile phone 1 and the operation of the switch 35. You can talk without having, and you can concentrate on driving.
According to the present invention, it is only necessary to attach the hands-free main body 2 to the mobile phone 1 with the clip 25, and the connection is simple.
In addition, since the hands-free main body 2 and the car stereo 3 are connected cordlessly by weak FM radio waves, the surroundings of the driver's seat are not complicated by the cord.

The perspective view which shows the state which attached the hands-free main body to the mobile phone. Side view of the hands-free body. The block diagram which shows the relationship between a mobile telephone, a hands-free main body, and a car stereo. Explanatory drawing which shows a use condition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mobile phone 10 ... Earpiece 2 ... Hands free main body 20 ... Microphone 21 ... Oscillator 22 ... FM modulation means 24 ... Transmitting antenna 25 ... Clip 3 .... Car stereo 32 ... Speaker 33 ... Receiving antenna 34 ... FM demodulation means 35 ... Changeover switch

Claims (1)

  A hands-free device for a driver to perform a hands-free call using a mobile phone in a car, the hands-free main body being attached to the earpiece of the mobile phone with a one-touch via a clip, and provided in the hands-free main body The mobile phone comprising a microphone, an oscillator, and FM modulation means, wherein the hands-free main body has a function of wirelessly transmitting an incoming voice signal received from a call partner received by a mobile phone using an FM carrier. Hands-free device for telephones.

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