JP2005057795A - Portable telephone set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable telephone set having a circuit configuration and an internal structure wherein a low-frequency signal processing part is hardly affected by transmission radio waves. <P>SOLUTION: In the portable telephone set which performs transmission/reception by radio, an area to dispose a high-frequency signal processing part including an antenna and an area to dispose a low-frequency signal processing part including a speaker are determined, the area to dispose the high-frequency signal processing part and the area to dispose the low-frequency signal processing part are arranged separately within the portable telephone set in an active state, and particularly, the high-frequency signal processing part is provided near a microphone. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to the internal structure of a portable telephone that transmits and receives wirelessly, and particularly relates to the arrangement of a low-frequency signal processing unit and an antenna.

  Conventionally, an antenna of a portable telephone such as a cordless telephone, a PHS (personal, handy phone, system), or a mobile telephone that performs transmission / reception wirelessly is generally arranged at an upper end portion of the casing. is there. In addition, the microphone for transmitting / receiving is arranged at the lower end of the casing so as to be close to the mouth, and the speaker for receiving is placed at the upper end of the casing so as to be in close contact with the ear. It is a structure arranged at a position close to the antenna. Further, a high-frequency signal processing unit that processes high-frequency radio waves for reception or transmission is provided in the vicinity of the antenna in the casing of the portable telephone. Further, a low frequency signal processing unit for processing voice as a low frequency signal is provided, and the low frequency signal processing unit is disposed in the vicinity of the microphone for transmission. The receiving speaker is wired from the low frequency signal processing unit.

  In this portable telephone, the received radio wave is converted into a low-frequency signal that can be heard by the user's ear in the high-frequency signal processing unit, and the low-frequency signal is amplified and supplied to the receiving speaker. Can be heard. In addition, the transmission sound input through the transmission microphone is amplified by the low frequency signal processing unit, modulated by the high frequency signal processing unit, converted into a high frequency signal, and transmitted through the antenna. The transmitted radio wave is connected to the other telephone through a telephone line via a relay station or the like, or is again connected to the other portable telephone or the like in the state of radio waves from the relay station or the like.

  By the way, an antenna of a mobile phone is a part that receives or transmits high-frequency radio waves for wireless transmission and reception, and has a length (wavelength corresponding to the wavelength of the frequency to be used to efficiently transmit and receive radio waves. A 1/2 or 1/4) antenna is employed. The wavelength becomes shorter as the frequency becomes higher, and conversely becomes longer as the frequency becomes lower. However, the wavelength of the frequency adopted for the cordless telephone, PHS, mobile phone, etc. is about several tens to several hundreds cm, Thus, the wiring material corresponding to the length of 1/2 or 1/4 or the copper wire of the printed circuit board functions in the same manner as the antenna, so that the transmission radio wave easily enters.

  The low-frequency signal processing unit is a part that handles low-frequency signals and does not respond to high-frequency signals, but the inductance of the lead wires of the high-frequency attenuation capacitors used in the low-frequency signal processing unit and the wiring part of the printed circuit board Since the component forms a high impedance to the high frequency signal, the operation of the low frequency signal processing unit becomes unstable when it receives a strong high frequency signal, sometimes causing oscillation and generating unnecessary noise. . The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a portable telephone having a circuit configuration and an internal structure in which a low-frequency signal processing unit is hardly affected by a transmission radio wave.

  The invention described in claim 1 is a portable telephone that performs transmission and reception wirelessly, and defines an arrangement region of a high-frequency signal processing unit including an antenna and an arrangement region of a low-frequency signal processing unit including a speaker, and performs high-frequency signal processing The arrangement area of the unit and the arrangement area of the low-frequency signal processing unit are arranged apart from each other in the mobile phone in use.

  According to a second aspect of the present invention, in the mobile phone according to the first aspect, the arrangement region of the high-frequency signal processing unit including the antenna is in the vicinity of the microphone.

  According to the present invention, in the mobile phone in use, the arrangement area of the high-frequency signal processing unit including the antenna and the arrangement area of the low-frequency signal processing unit including the speaker are arranged apart from each other. It is possible to eliminate the influence of the radio wave radiated from the processing unit on the low frequency signal processing unit.

  According to the present invention, since the high-frequency signal processing unit including the antenna and the low-frequency signal processing unit including the speaker are arranged apart from each other in the usage state, the transmission radio wave is radiated from the high-frequency signal processing unit when transmitted. The influence of the radio wave on the low frequency signal processing unit can be reduced, and good transmission / reception can be performed. Moreover, since the gain value of the high frequency amplifier can be adjusted to an optimum value as necessary, the power consumption can be kept low, so that the power consumption of the battery is reduced and a long-time call is possible.

  FIG. 1 (a) is an external view of a portable telephone according to the first embodiment of the present invention, and FIG. 1 (b) shows a side view thereof. As shown in FIG. 1, on the front surface of the portable telephone 1, there is a reception unit 2 for listening to a reception sound, an operation panel unit 3 on which various operation buttons such as a numeric keypad button, a transmission button, and a reception button are arranged, a telephone number And a display window 4 for displaying the intensity of radio waves and the like, a transmitter 5 and the like. An antenna 7 is provided on the side surface of the portable telephone 1 so as to be rotatable about an antenna fixing screw 6.

  The antenna 7 is provided on the antenna bottom 7b of the antenna 7 when the antenna head 7a rotates in a direction away from the side surface of the mobile phone 1 (arrow direction in the figure) and the antenna 7 is separated to a predetermined position. The position detection circuit 28 is configured to operate. Further, as shown in FIG. 1B, a high-frequency signal processing unit 10 that processes transmission / reception signals and a low-frequency signal processing unit 20 that processes low-frequency signals are provided. Since the high-frequency signal processing unit 10 is connected to the antenna 7 via the antenna fixing screw 6, it is disposed in the vicinity of the microphone 22 near the antenna bottom 7b. Further, the low frequency signal processing unit 20 is disposed adjacent to the speaker 21 in order to shorten the wiring with the speaker 21. In addition, the display unit 26 is disposed on the display window 4 side so that the display surface thereof comes.

  The circuit configuration and the operation thereof will be described with reference to the circuit block diagram of the portable telephone shown in FIG. 2 and the operation flowchart shown in FIG. First, in the circuit block diagram of FIG. 2, the radio wave received by the antenna 7 is extracted only by the DPX (Duplexer) 11 which is a demultiplexer provided in the high frequency signal processing unit 10, and the matching circuit in the next stage is extracted. 12 is supplied to the high-frequency amplifier 13. The high frequency signal amplified with a predetermined gain in the high frequency amplifier 13 is converted into a low frequency signal which is an audio frequency by the demodulation circuit 14, amplified by the low frequency signal processing unit 20 in the next stage, and output as a received sound from the speaker 21. The

  On the other hand, an audio signal (speech sound) supplied via the microphone 22 is amplified by the low frequency signal processing unit 20 and then modulated by the modulation circuit 15 of the high frequency signal processing unit 10 into a transmission radio wave form. The high frequency signal modulated in the form of the transmission radio wave is amplified by the high frequency amplifier 16 and then supplied from the DPX 11 to the antenna 7 via the matching circuit 17 and emitted as the transmission radio wave. In addition to performing operation control related to transmission / reception of the mobile phone 1 to be described later, the CPU 23 is provided in the operation unit 24 when a reception sound is generated from a sounding body (not shown) or transmitted when a radio wave is received. The telephone number of the other party is displayed on the display unit 26 via a numeric keypad or the like. A program related to such operation control is stored in the ROM 27 in advance.

  The mobile phone according to the first embodiment of the present invention is provided with a position detection circuit 28 made of, for example, conductive rubber or the like to detect the position of the antenna 7, and the antenna 7 is rotated to a predetermined position. Is detected and a detection signal is supplied to the CPU 23. The high-frequency signal processing unit 10 is provided with a level detection circuit 19 that detects the intensity (level) of the received radio wave, and the gain value of the high-frequency amplifier is set according to the obtained intensity (level) of the received radio wave. Set by CPU23.

  Next, the operation of the mobile phone 1 will be described using the operation flowchart of FIG. First, in step S1, based on a command from the CPU 23, for example, initial setting values of gain values of the high frequency amplifiers 13 and 16 stored in the ROM 27 are read and set. Next, in step S2, the output signal of the position detection circuit 28 is monitored to detect the position of the antenna 7. If the antenna 7 is in a predetermined position in step S3 (step S3: yes), the high frequency circuit is detected in step S4. The power supply unit 18 is turned on. The predetermined position of the antenna 7 mentioned here indicates a case where the antenna 7 is rotated in a direction away from the side surface of the mobile phone 1 and the position detection circuit 28 is turned on. If the antenna 7 is not at the predetermined position (step S3: no), the process returns to step S2 and the output signal of the position detection circuit 28 is monitored. That is, high-frequency power is not supplied until the antenna reaches a predetermined position.

  After the high-frequency circuit power supply unit 18 of the portable telephone 1 is turned on in step S4, a command is issued from the CPU 23 to the high-frequency signal processing unit 10 and the low-frequency signal processing unit 20 in step S5. Perform various operations. That is, the high-frequency signal processing unit 10 amplifies the received radio wave and supplies the demodulated signal to the low-frequency signal processing unit 20, and the low-frequency signal processing unit 20 receives from the sound generator in accordance with the signal supplied from the demodulation circuit 14. A series of reception processing operations such as generating sound are performed. Next, the process proceeds to step S 6, where the level of the received radio wave is detected by the level detection circuit 19 and the signal is supplied to the CPU 23.

  In step S7, the CPU 23 compares the reception level detected in step S6 with the reference level, uses the ratio (reference level / reception level) as a coefficient, and multiplies the reference gain set in step S1 as a new gain. Update as a value. That is, in an area where the electric field strength of the received radio wave is large, such as near a relay station, the gain of the high-frequency amplifier is lowered, and transmission / reception is performed with low power. On the other hand, in a region where the electric field strength of the received radio wave is small, such as a position just between the relay station and the relay station, the gain of the high-frequency amplifier is increased, and transmission / reception is performed with large power. With this configuration, it is possible to suppress power consumption more than necessary. Note that the reference level and the reference gain are, for example, the minimum value of the electric field strength that guarantees good communication according to the standard, and the gain value to be set when the radio wave having the minimum value is received.

  In steps S1 to S7, conditions necessary for reception and transmission are established, and transmission / reception is performed with the other party. Then, in step S8, it is monitored whether or not the call is continued. If the call is continued (step S8: no), the process returns to step S6, and the operation after step S6 is continued to perform the optimum gain adjustment. Do. That is, even if the electric field strength changes with movement, steps S6 and S7 are repeatedly executed during a call in order to always call with an optimum gain. When the call is completed (step S8: yes), the process proceeds to step S9, and after performing the operation sequence of communication termination, the power of the high-frequency circuit 13 is turned off by the high-frequency circuit power supply unit 18 to terminate the communication.

  In this step S8, when the call is terminated from the other party, the call termination data sent from the other party's telephone included in the received radio wave is supplied to the CPU 23 via the demodulation circuit 14, and the CPU 23 Based on this call end data, a call end sound is output from the speaker 21 to notify the receiver of the end of the call, and the high frequency power supply circuit 18 is turned off (step S9) to end the call. When the end of the call is made from the receiver side, the call end signal is modulated by the modulation circuit 15 based on the call end data output from the operation unit 24, and the radio wave is transmitted through the high frequency amplifier 16 and the antenna 7. In addition to notifying the other party of the end of the call, the call is ended through the operation of step S9. In step S8, when ending the call, the position detection circuit 28 detects that the antenna 7 has been returned to the original position, and the operation of step S9 is performed by a signal from the position detection circuit 28. good.

  The mobile phone according to the first embodiment of the present invention is arranged at a position where the antenna 7 is in close contact with the side surface of the mobile phone 1 during standby when receiving radio waves, as shown in FIG. Therefore, a signal indicating that the antenna 7 is closed is sent from the position detection circuit 28 to the CPU 23, and no power supply voltage is supplied to the high-frequency amplifier 16 according to a command from the CPU 23. When receiving a radio wave and starting a call, or when making a call by itself, the detection signal is output from the position detection circuit 28 by first rotating the antenna 7 away from the side surface of the portable telephone 1. Then, the power supply voltage is supplied to the high-frequency amplifier 16 according to a command from the CPU 23, and communication is enabled.

  FIG. 4 is an external view of a portable telephone according to the second embodiment of the present invention. The difference between the portable telephone according to the second embodiment and the portable telephone according to the first embodiment is that the position of the antenna is changed. As shown in FIGS. 1B and 4B, the portable telephone 1 according to the first and second embodiments has the low frequency signal processing unit 20 disposed at a position adjacent to the speaker 21, and the antenna 7 is provided. A structure in which the high-frequency signal processing unit 10 including the microphone is disposed in the vicinity of the microphone 22 is employed. The function of the antenna 7 used in the mobile phone 1 according to the second embodiment of the present invention is similar to that of the mobile phone 1 of the first embodiment described above, provided with a position detection circuit 28, and transmission. Is started, the position detection circuit 28 is activated by pulling out the antenna 7 below the portable telephone 1, and the power of the high-frequency amplifier 16 is supplied by a command from the CPU 23 to enable transmission / reception.

1 is an external view of a mobile phone according to a first embodiment of the present invention. 1 is a circuit block diagram of a mobile phone according to a first embodiment of the present invention. The operation | movement flowchart of the mobile telephone by 1st Embodiment of this invention. The external view of the portable telephone by 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portable telephone 2 Reception part 3 Operation panel part 4 Display window 5 Transmission part 6 Antenna fixing screw 7 Antenna 7a Antenna head 7b Antenna bottom part 10 High frequency signal processing part 20 Low frequency signal processing part 21 Speaker 22 Microphone 26 Display part 28 Position detection circuit

Claims (2)

In mobile phones that send and receive wirelessly,
Determine the arrangement area of the high frequency signal processing unit including the antenna and the arrangement area of the low frequency signal processing unit including the speaker,
A cellular phone characterized in that an arrangement area of the high-frequency signal processing unit and an arrangement area of the low-frequency signal processing unit are arranged apart from each other in a portable phone in use.   2. The portable telephone according to claim 1, wherein an arrangement area of the high-frequency signal processing unit including the antenna is in the vicinity of the microphone.

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