KR20020035370A - A Hands Free Device For Cellular Phone - Google Patents

Abstract

PURPOSE: A handsfree device for portable phones is provided to secure a wide transmitting distance for a wireless ear set, to add a convenient installation function, and to automatically receive and output an input signal. CONSTITUTION: A handsfree device consists of a main body(100) and a wireless ear set(200). The main body(100), installed in a sun cover(1), is comprised of a speech button(110), a microphone(120), a speaker phone(130), a volume adjustment unit(140), a speaker phone/earphone selection switch(150), and a portable phone connection unit(170). The wireless ear set(200) comprises a wireless earphone(230) and a power switch(210). The speech button(110) enable a user to use the handsfree device when communication access from the external to the portable phone is started. The microphone(120) receives and sends the user's voice. The speaker phone(130) outputs an external speaker's voice signal through the portable phone. The volume adjustment unit(140) adjusts the volume of the external speaker's voice signal. The speaker phone/earphone selection switch(150) enable the user to select either the speaker phone(130) or the wireless earphone(230) for the external speaker's voice. The portable phone connection unit(170) connects the portable phone with the main body(100).

Description

Hands Free Device for Cellular Phones

The present invention relates to a hands-free device for a mobile phone, and more particularly, a magnetic field induction coil for using a wireless earphone is printed on a printed circuit board, and a signal sketch circuit is mounted on the earphone so that the wireless earphone can be conveniently used. A handsfree device for a mobile phone.

In recent years, as the spread of mobile phones has rapidly increased, the use of mobile phones has increased in vehicles. Accordingly, many traffic accidents have occurred, thereby legally restricting the use of mobile phones while driving a vehicle. However, because there are many currencies that are necessary for business while driving, this is only legal and hard to regulate. Therefore, there is a hands-free device for a mobile phone installed in a vehicle as a means to solve this problem, which has a disadvantage in that the contents of the call received by the mobile phone users to the passengers of the vehicle by the speaker and the microphone is installed in the hands-free device.

As a related art for solving the above disadvantages, FIG. 1 discloses a conventional hands-free device for a mobile phone in which a user can only know a call by using a wireless earphone.

As shown in FIG. 1, a conventional hands-free device includes a mobile phone or a portable information terminal 30, a connection device 32 installed in a vehicle to hold a mobile phone or a portable information terminal, and an output amplifier for supporting transmission and reception ( 34) and wireless amplifier set including an input amplifier 38, an induction coil 40 attached to the vehicle, and a multiplexer 38 for connecting the input / output amplifiers 34 and 38 to the induction coil. Reference numeral 50 denotes a receiving coil 52 and a transmitting coil 54, an input amplifier 56 and an output amplifier 58 connected to the receiving coil 52 and the transmitting coil 54, and an input amplifier 56, respectively. A earphone 60 connected to the s) and a microphone 62 connected to the output amplifier 58. Here, the receiving coil 52, the input amplifier 56 and the earphone 60 forms a receiving unit and the transmitting coil 54, the output amplifier 58 and the microphone 62 form a transmitting unit.

However, the hands-free device for a mobile phone using such a conventional wireless earphone must use the multiplexer 38 to improve the interference (howling) between the input voice signal and the output voice signal, which is a voice transmission and reception function for the wireless ear set. This is because howling occurs when the magnetic field induction coil simultaneously transmits and receives a signal. As a result, the hands-free device uses a multiplexer, and the radio ear set includes a signal transmitting means including a signal receiving means and a microphone, which has disadvantages of complexity and inefficiency.

In addition, the signal transmission and reception range using the magnetic field induction coil of the conventional hands-free device is a very short distance, within about 30cm has a problem that practical application is difficult. In addition, when the transmission range is increased by increasing the size of the transmission, the hands-free device is enlarged, making it difficult to install not only aesthetically, but also in the vehicle, thereby increasing the manufacturing price.

In particular, in order to use a wireless earphone, there is also the inconvenience of having to operate the remote control one by one.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hands-free device for a mobile phone which can secure a wide transmission distance of a wireless earset, and which has a miniaturization and a convenient mounting function.

Another object of the present invention is to provide a convenient and economical hands-free device for a mobile phone which automatically receives and outputs an input signal when using a wireless earphone.

1 is a block diagram schematically showing a conventional hands free device;

2 is a perspective view of a hands-free device according to the present invention;

3 is a block diagram showing the function of a hands-free main body according to the present invention;

4 is a detailed circuit diagram of a hands-free main body according to the present invention;

5 is a view showing the configuration of a substrate-printed magnetic field induction coil of the hands-free body according to the present invention;

6 is a block diagram showing the function of a wireless ear set according to the present invention;

7 is a detailed circuit diagram of a wireless ear set according to the present invention;

8 is a view showing a pickup coil of a wireless ear set according to the present invention, and

9 is a block diagram of a signal sketch of a wireless ear set according to the present invention;

10 is a diagram showing a detailed circuit diagram of the sketch circuit.

<Explanation of symbols for the main parts of the drawings>

100: hands-free main body 110: call button

120: microphone 130: speakerphone

140: volume control device 150: speakerphone / earphone selection switch

160: input signal amplifier 161: audio amplifier 1

162: power supply device 170: mobile phone connection device

180: substrate printed magnetic field induction coil 200: wireless ear set

210: power switch 230: earphone

240: volume controller 260: audio amplifier

261: signal sketch means 262: automatic power switch

263: audio amplifier 2280: pickup coil

Technical means of the present invention for achieving the above object comprises a connection device for connection with a mobile phone, an input signal amplifier for amplifying an input voice signal, and an output device for outputting the amplified input signal to a wireless earphone A hands-free device for a mobile phone comprising a main body and a wireless ear set having a pickup coil for receiving a signal output from the main body, an input signal amplifier, and an earphone, wherein the output device of the main body receives the amplified input signal. Magnetic field inducing means printed on a printed circuit board for transmission to the pick-up coil of the wireless ear set.

In addition, the main body is preferably configured to include a speaker, a switching means for selecting one of the wireless earphone and the speaker, and / or a microphone for inputting a voice signal of a mobile phone user.

The wireless ear set may further include a signal sketch circuit for driving the input signal amplifier by amplifying and detecting a signal received through the pickup coil, wherein the pickup coil has a coil wound around the rod ferrite core a plurality of times. It is preferred to be configured.

In addition, the main body is preferably mounted on the vehicle windshield sunshade.

Hereinafter, a hands free device of the present invention will be described with reference to the accompanying drawings.

2 is a perspective view showing a hands-free device according to the present invention, in which the main body 100 mounted at approximately the center of the sun shader 1 of the vehicle allows the user to use the hands-free device when a communication connection is initiated from the outside to the mobile phone. Call button 110, the microphone 120 for receiving and transmitting the voice input by the user, the speakerphone 130 to output the voice signal of the external caller through the mobile phone, the volume control device for adjusting the volume of the output external caller 140, a speakerphone / earphone selection switch 150 for allowing a mobile phone user to select an external caller voice from the speakerphone or a wireless earphone, and a mobile phone connection device 170 connecting the mobile phone to the main body 100. The wireless ear set 200 is configured to include a wireless earphone 230 and a power switch 210. Here, the speakerphone / earphone selection switch 150 may be fixed to the speakerphone 130 by default so that the user may switch to the wireless earphone 230 when necessary.

3 and 4 are internal block diagrams and detailed circuit diagrams of the hands-free main body 100, respectively. The process of inputting and processing a voice signal of an external caller will be described in detail as follows.

When a specific caller makes a phone call from the outside, the mobile phone rings and the automobile driver presses the call button 110 of the hands-free main body 100. As a result, as shown in FIG. 4, the call button 110 constituted by the two-string switch is operated so that the power supply unit 162 of about 6V to 12V is connected and power is applied to the hands-free main body 100.

The voice data of the external caller is input to the audio input unit 171 through the mobile phone connection device 170, and the input voice data is input signal amplification unit 160 via the volume control device 140 composed of a variable resistor (VR). Is amplified by input. The amplified voice data is selectively connected to the speakerphone 130 and the wireless earphone 230 through the speakerphone / wireless earphone selection switch 150. That is, when the user selects the speakerphone 130 mounted on the hands-free main body 100, the user can directly receive the voice of an external caller from the main body. 5 shows a configuration of a magnetic field induction coil connected to the speakerphone / wireless earphone switch 150. A sun shader for a vehicle is manufactured as a printed circuit board (PCB) in the form of a coil on its surface. It can be configured by printing or by attaching a PCB printed with a magnetic field induction coil to a car shade. As described above, the magnetic field induction coil printed according to the present invention can be configured to be ultra-thin hands-free device, and the magnetic field induction range is about 1 m or more, which is wider than that of a coil wound on a conventional core and mounted on the driver's sun shader. It is possible to shorten the use range more effectively. In addition, if the magnetic field induction coil printed on the PCB, it is easy to manufacture, the manufacturing cost can be reduced, there is a side effect that the work efficiency is also improved.

6 and 7 are block diagrams and detailed circuit diagrams of the wireless ear set 200 according to the present invention, respectively. The external caller voice signal transmitted through the magnetic field induction coil of the hands-free main body 100 is received and the wireless earphone ( The process of output through 230 is described in detail as follows.

The wireless ear set 200 is a pickup coil 280 for receiving an external caller voice signal transmitted through the magnetic field induction coil 180 of the hands-free main body 100, a volume controller 240 composed of a variable resistor, and reception. An audio amplifier 2 263 for amplifying the external caller's voice, a wireless earphone 230 for outputting the amplified voice, signal sketching means 261 for detecting that an external voice signal is received at the pickup coil 280, and The signal sketching means includes an auto power switch 262 which operates according to the detection of the voice signal reception.

8 shows the structure of the pickup coil 280. The coil 281 is wound around the rod-like ferrite core 282 about 500 times and mounted in the wireless ear set 200. The ferrite core 282 has an audio frequency. In order to match with, the reception sensitivity can be increased.

FIG. 9 illustrates a connection configuration of the signal sketching means 261, the auto power switch 262, and the audio amplifier 2 263 built in the audio amplifier IC of FIG. 7, and FIG. The detailed circuit diagram of the sketching means 261 is shown.

The signal sketching means 261 comprises a signal detection circuit composed of transistors Q1 to Q3 and a drive circuit composed of transistors Q4 to Q4 for exciting and amplifying the signal detected by the signal detection circuit. The signal detected by the actual signal detection circuit is very weak and the excitation and amplification of the signal in the drive circuit is required to operate the auto power switches 262 and Q7 connected to the output of the drive circuit. As a result, when the auto power switches 262 and Q7 operate, the reference power source Vcc is applied to the audio amplifier 2 263 of FIG.

The operation of the wireless ear set 200 will be described with reference to FIGS. 7 and 10 as follows. First, as the user switches the speakerphone / wireless earphone selection switch of the handsfree main body 100 to the wireless earphone, the voice signal of the external caller is transmitted through the printed magnetic field induction coil 180 of the handsfree main body 100, and wirelessly. It is then received via the pickup coil 280 of the set 200. At this time, the power switch 210 in the wireless ear set should be in the ON state. This is to only use the power provided in the wireless ear set when using, to prevent unnecessary power consumption when not in use. When the voice signal is received from the pickup coil 280, the audio signal is input to the audio amplifier IC 260. Here, the voice signal received from the pickup coil 280 is rectified through the diodes D1 and D2 to be DC, and the DC voice signal is input to the sketching means. At this time, a weak signal is inputted to the input terminal IN of the signal sketching means 261. The signal is detected by the signal detecting circuit of the signal sketching means. Operate (Q7).

As a result, the power source 265 of the wireless ear set, for example, a 1.5V mercury battery (button battery), does not receive a signal to the pickup coil 280 even when the power switch 210 is in an ON state. When the signal is not connected, the auto power switch 262 is operated to apply power to the audio amplifier 2 263. As such, as power is applied, the audio amplifier 2 263 operates to amplify the input voice signal and output the same to the user through the wireless earphone 230.

Detailed configuration of the circuit diagram described so far shows the actual designed embodiment, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and such modifications and modifications belong to the appended claims It is natural.

As described above, the hands-free device of the present invention can reduce the size of the wireless ear set 200 by attaching it to the main body 200 attached to the sun shader 1 of the vehicle without attaching the speakerphone to the wireless ear set 200. In addition, the magnetic field induction coil 180 can be printed on a PCB shader to effectively increase its output range, as well as to be installed closer to the user.

In addition, by installing the signal sketching means 261 in the wireless ear set 200, the user can use the wireless earphone conveniently and simply, as well as the structure is very simple and easy to manufacture and economical. In particular, this advantage is very large in pursuing the miniaturization and convenient function of the wireless ear set.

Claims (6)

A mobile phone connection device 170 for connecting to a mobile phone, an input signal amplifier 160 for amplifying an input voice signal, and a magnetic field induction coil 180 for outputting the amplified input signal to the wireless earphone 230. With a main body 100 having a pickup, a pickup coil 280 for receiving a signal output from the main body 100, an audio amplifier 260 and a wireless ear set 200 having a wireless earphone 230 In the hands-free device for a mobile phone configured, The magnetic field induction coil 180 of the main body 100 is configured to be printed on a printed circuit board (PCB) to transmit the amplified input signal to the pickup coil 280 of the wireless ear set 200. Hands-free device for a mobile phone, characterized in that. The apparatus of claim 1, wherein the main body 100 further includes a speakerphone 130, and a speakerphone / wireless earphone switch 150 for selecting one of the wireless earphone 230 and the speakerphone 130. Hands-free device for mobile phones. The hands-free device for a mobile phone according to claim 1, wherein the main body (100) includes a microphone (120) for inputting a voice signal of a mobile phone user. The hands-free handset for a mobile phone according to claim 1, wherein the wireless ear set 200 further includes signal sketching means 261 for detecting a signal received through the pickup coil 280 to drive the audio amplifier 263. Device. The hands-free device for a mobile phone according to claim 1, wherein the pickup coil (280) is formed by winding a coil (281) a plurality of times on a rod-like ferrite core (282). The hands-free device for a mobile phone according to any one of claims 1 to 3, wherein the main body (100) is mounted on a vehicular sunshade (1).