JP2014007594A - Portable terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable terminal device having a short-range radio communication function, to which two types of lids can be interchangeably attached according to desired additional functions (portability, and contactless charging function), and capable of performing information communication suitably by short-range radio communication regardless of the types of the lid attached to the device.SOLUTION: In a portable terminal device 100, a frequency setting unit 12 sets a frequency of a radio wave used for information communication by short-range radio communication via a loop antenna 10 to a different value depending on the case where a first lid 2A provided with a charging coil 21 is attached to the device, and the case where a second lid 2B not provided with the charging coil 21 is attached to the device.

Description

  The present invention relates to a portable terminal device having a short-range wireless communication function for performing information communication by short-range wireless communication.

  A mechanism is known in which charging power for charging a secondary battery built in a portable terminal device is supplied from a charging device using electromagnetic induction by a coil without using an electrical contact. (See Patent Documents 1 to 3). Hereinafter, a function realized by a mechanism for charging a secondary battery without using an electrical contact by using electromagnetic induction is referred to as a “contactless charging function”. According to the portable terminal device having this non-contact charging function, the charging coil provided in the portable terminal device is electromagnetically coupled to the feeding coil by the alternating magnetic field generated in the feeding coil provided in the charging device, thereby Output AC power. When AC power is output from the charging coil in this way, in the mobile terminal device, the AC power is converted into DC power, and the secondary battery is charged with the converted DC power.

  On the other hand, non-contact IC (Integrated Circuit) chips such as Felica (registered trademark) and NFC (Near Field Communication) are mounted, and a loop antenna (hereinafter referred to as “loop antenna”) is used without using electrical contacts. ), A portable terminal device having a function for performing information communication by short-range wireless communication (hereinafter referred to as “short-range wireless communication function”) is known (see Patent Document 4). According to the portable terminal device having the short-range wireless communication function, for example, the radio wave transmitted from the loop antenna of the transmission side device such as the automatic ticket checker at the station or the non-contact communication reader / writer provided at the cash register of the store is portable. Information communication is performed by receiving the signal through the loop antenna of the terminal device.

  A portable terminal device having both a non-contact charging function and a short-range wireless communication function is known (see Patent Document 5). Such a portable terminal device can charge a built-in secondary battery by a contactless charging method and can perform information communication by short-range wireless communication via a loop antenna.

JP-A-8-18636 JP-A-9-63655 JP 2007-244165 A JP 2012-60406 A JP 2008-206297 A

  A portable terminal device having both a contactless charging function and a short-range wireless communication function has at least a charging coil for realizing the contactless charging function and a loop antenna for realizing the short-range wireless communication function. Therefore, for example, the portable terminal device is inferior in portability due to an increase in the thickness of the portable terminal device as compared with a portable terminal device having only the short-range wireless communication function of both functions.

  Therefore, in a portable terminal device having a short-range wireless communication function, a lid provided with a charging coil and a lid provided with no charging coil as a lid detachable from the portable terminal body It is conceivable that two types of lids are prepared, and the two types of lids can be exchanged with each other as desired by the user.

  For example, in a portable terminal device having a short-range wireless communication function, when a user desires a portable terminal device that is thin and excellent in portability, a lid that is not provided with a charging coil is mounted. You can do it. Further, when the user desires a portable terminal device having a contactless charging function, a lid provided with a charging coil may be attached. As described above, in the portable terminal device having the short-range wireless communication function, the two types of lids are configured to be replaceable, so that the user can select the lid according to the desired attached function (portability, contactless charging function). The body can be arbitrarily selected.

  However, even if any of the two types of lids is attached, the configuration (sensitivity) of information communication by short-range wireless communication via the loop antenna is not reduced. Is not easy.

  In a portable terminal device having a short-range wireless communication function, when a lid provided with a charging coil is attached to add a contactless charging function, the charging coil should be arranged close to the loop antenna. And, when the thickness of the portable terminal device is increased, the frequency of the radio wave used for information communication is shifted to a suitable band as compared with the case where the lid body without the charging coil is attached. In addition, there is a shift in the position where the mobile terminal device should be brought close to or in contact with the non-contact communication reader / writer.

  Accordingly, an object of the present invention is to allow two types of lids to be exchanged with each other in accordance with a desired accessory function (portability, contactless charging function) in a portable terminal device having a short-range wireless communication function. It is an object of the present invention to provide a portable terminal device capable of suitably performing information communication by short-range wireless communication even when any one of the lids is attached.

The present invention includes a mobile terminal body in which a secondary battery is stored;
A first lid that is detachably attached to the mobile terminal body and provided with a charging coil that outputs AC power by electromagnetic induction;
A second terminal body that is detachably attached to the portable terminal body and is not provided with a charging coil, and a portable terminal device comprising:
The first lid and the second lid are attached to the mobile terminal body so as to be interchangeable with each other,
In the mobile terminal body,
A loop antenna,
An information communication unit for performing information communication by short-range wireless communication via the antenna;
A first lid mounting signal output unit that outputs a first lid mounting signal indicating that the first lid is mounted when the first lid is mounted on the mobile terminal body;
When the first lid mounting signal output unit is outputting the first lid mounting signal, the AC power output from the charging coil provided in the first lid is converted into DC power, A power converter that outputs the converted DC power;
A charge controller that connects the secondary battery and the power converter, and charges the secondary battery with DC power output from the power converter;
When the first lid mounting signal is output by the first lid mounting signal output unit and when the first lid mounting signal is not output, it is used for information communication by the information communication unit. And a frequency setting unit that sets the frequency of the radio wave to a different frequency.

  Moreover, the portable terminal device of this invention WHEREIN: The said 1st cover mounting | wearing signal output part is a said 1st cover body, when the said coil for charge provided in the said 1st cover body is connected to the said power conversion part. A mounting signal is output.

  In the mobile terminal device of the present invention, the frequency setting unit outputs the first lid mounting signal when the first lid mounting signal output unit outputs the first lid mounting signal. The frequency of the radio wave used for information communication by the information communication unit is set to a higher value than when there is not.

Moreover, in the mobile terminal device of the present invention, the frequency setting unit includes:
When the first lid mounting signal output unit outputs the first lid mounting signal, the radio wave frequency used for information communication by the information communication unit is set to 13.66 MHz,
When the first lid mounting signal output unit does not output the first lid mounting signal, the frequency of the radio wave used for information communication by the information communication unit is set to 13.56 MHz.

  In the mobile terminal device of the present invention, the first lid and the second lid serve as marks for positions where the first lid and the second lid are brought close to or in contact with the communication target when information communication is performed via the antenna. It is characterized by a figure.

  According to the present invention, a mobile terminal device includes a mobile terminal body in which a secondary battery is stored, and a first lid and a second lid that are detachable from the mobile terminal body. The first lid is a lid provided with a charging coil that outputs AC power by electromagnetic induction, and the second lid is a lid provided with no charging coil.

  The first lid and the second lid are attached to the mobile terminal body so as to be interchangeable. For example, when a user desires a portable terminal device that is thin and excellent in portability, a second lid that is not provided with a charging coil may be attached. In addition, when the user desires a portable terminal device having a contactless charging function, the first lid provided with a charging coil may be attached. Thus, in the portable terminal device of the present invention, the first lid and the second lid can be exchanged according to the function desired by the user (portability, contactless charging function).

  In the mobile terminal device of the present invention, the mobile terminal body is provided with a loop-shaped antenna, an information communication unit, a first lid mounting signal output unit, and a frequency setting unit. The information communication unit performs information communication by short-range wireless communication via a loop antenna. The first lid mounting signal output unit indicates that the first lid is mounted when the first lid provided with the charging coil is mounted on the mobile terminal body. Outputs a wearing signal. The frequency setting unit includes information by the information communication unit when the first lid mounting signal is output by the first lid mounting signal output unit and when the first lid mounting signal is not output. The frequency of the radio wave used for communication is set to a different frequency. Here, when the first lid attachment signal is output, the first lid is attached to the portable terminal body, and when the first lid attachment signal is not output, the second lid is attached to the portable terminal body. The body is attached.

  The portable terminal device of the present invention having a loop antenna and an information communication unit has a short-range wireless communication function, and transmits a radio wave transmitted from a loop antenna of a transmission side device such as a non-contact communication reader / writer to the portable terminal device. Information communication by short-range wireless communication can be performed. In the mobile terminal device of the present invention, the frequency setting is performed when the first lid provided with the charging coil is attached and when the second lid not provided with the charging coil is attached. Since the frequency of the radio wave used for information communication is set to a different value, information communication by short-range wireless communication can be performed regardless of whether the first cover body or the second cover body is attached. It can be suitably performed.

  In the mobile terminal device of the present invention, the mobile terminal main body is provided with a power conversion unit and a charge control unit. When the first lid mounting signal output unit outputs a first lid mounting signal, that is, when the first lid is mounted on the mobile terminal body, the power conversion unit The AC power output from the charging coil provided in is converted to DC power, and the converted DC power is output. And a charge control part connects a secondary battery and a power converter, and charges a secondary battery with the direct-current power output from a power converter. Therefore, the portable terminal device of the present invention is a portable terminal device having a contactless charging function when the first lid is attached to the portable terminal body.

  According to the invention, the first lid mounting signal output unit outputs the first lid mounting signal when the charging coil provided in the first lid is connected to the power conversion unit. Can be configured.

  Further, according to the present invention, the frequency setting unit is more informed when the first lid mounting signal is output by the first lid mounting signal output unit than when the first lid mounting signal is not output. The frequency of the radio wave used for information communication by the communication unit is set to a high value. As a result, the mobile terminal device can suitably perform information communication by short-range wireless communication even when either the first lid or the second lid is attached.

  According to the invention, the frequency setting unit is configured to output the first lid mounting signal output from the first lid mounting signal output unit, that is, when the first lid is mounted on the mobile terminal body. The frequency of the radio wave used for information communication by the information communication unit is set to 13.66 MHz. In addition, the frequency setting unit uses the information communication unit when the first lid mounting signal output unit does not output the first lid mounting signal, that is, when the second lid is mounted on the mobile terminal body. The frequency of the radio wave used for information communication is set to 13.56 MHz. As a result, the mobile terminal device can suitably perform information communication by short-range wireless communication even when either the first lid or the second lid is attached.

  According to the present invention, the first lid and the second lid are brought close to or in contact with a communication target (for example, a non-contact communication reader / writer) when information communication is performed via a loop antenna. A figure that serves as a mark of the position is attached. When performing information communication by short-range wireless communication using a portable terminal device to which either the first lid or the second lid is attached, the figure attached to the lid is used as a mark. Information communication by short-distance wireless communication can be suitably performed by approaching or contacting the communication body.

It is a block diagram which shows the structure of the portable terminal device 100 which concerns on one Embodiment of this invention. It is a figure which shows the structure of 2 A of 1st cover bodies. It is a figure which shows the structure of the 2nd cover body 2B. It is a figure for demonstrating the frequency switching operation | movement by the frequency setting part. 5 is a flowchart showing a frequency switching operation by a frequency setting unit 12.

  FIG. 1 is a block diagram showing a configuration of a mobile terminal device 100 according to an embodiment of the present invention. FIG. 2 is a diagram showing a configuration of the first lid 2A. 2A is a diagram illustrating an inner surface of the first lid body 2A (a surface on the side facing the mobile terminal body 1), and FIG. 2B illustrates an outer surface of the first lid body 2A. FIG. FIG. 3 is a diagram showing a configuration of the second lid 2B. FIG. 3A is a diagram showing an inner surface of the second lid 2B (a surface facing the mobile terminal body 1), and FIG. 3B shows an outer surface of the second lid 2B. FIG. In addition, in FIG. 1, while showing the structure of the portable terminal device 100 in the state with which the 1st cover body 2A was mounted | worn, the structure of the charging device 200 and the non-contact communication reader / writer 300 is shown.

  The mobile terminal device 100 is, for example, a mobile phone device. The mobile terminal device 100 includes a mobile terminal main body 1 in which the secondary battery 6 is stored, and a first lid 2A and a second lid 2B that are detachable from the mobile terminal main body 1.

  The first lid body 2 </ b> A is a lid body in which a charging coil 21 that outputs AC power by electromagnetic induction is provided on the inner surface facing the mobile terminal body 1 in a state of being attached to the mobile terminal body 1. The second lid 2B is a lid that is not provided with the charging coil 21.

  The first lid body 2 </ b> A and the second lid body 2 </ b> B are attached to the mobile terminal body 1 in an exchangeable manner. For example, when the user desires the portable terminal device 100 that is thin and excellent in portability, the second lid 2B that is not provided with the charging coil 21 may be attached. When the user desires the portable terminal device 100 having a contactless charging function, the first lid 2A provided with the charging coil 21 may be attached. As described above, in the mobile terminal device 100 according to the present embodiment, the first lid 2A and the second lid 2B can be exchanged in accordance with functions desired by the user (portability and contactless charging function).

  Moreover, the magnetic sheet 22 is affixed on the inner surface which opposes the portable terminal main body 1 in the state with which the 1st lid 2A and the 2nd lid 2B were mounted | worn with the portable terminal main body 1. FIG. This magnetic sheet 22 prevents eddy currents from occurring when information communication by short-range wireless communication via the loop antenna 10 described later is performed, and prevents communication performance of information communication from deteriorating. To do.

  In addition, the outer surfaces of the first lid 2A and the second lid 2B are brought close to or in contact with the non-contact communication reader / writer 300 that is a communication object when information communication is performed via the loop antenna 10. A reference position mark 23 is provided as a position mark. When performing information communication by short-range wireless communication using the mobile terminal device 100 to which either the first lid 2A or the second lid 2B is attached, the first lid 2A and the second lid By using the reference position mark 23 attached to the body 2B as a landmark, the mobile terminal device 100 is brought close to or in contact with the non-contact communication reader / writer 300, whereby information communication by short-range wireless communication can be suitably performed.

  The reference position mark 23 is attached to a position where information communication by short-range wireless communication between the mobile terminal device 100 and the non-contact communication reader / writer 300 can be suitably performed. In the second lid 2B, the reference position mark 23 is attached at a different position depending on whether or not the charging coil 21 is provided.

  In the mobile terminal device 100 of the present embodiment, the mobile terminal body 1 includes a capacitive element 3 such as a capacitor, a rectifier circuit 4 that functions as a power conversion unit, a charge control circuit 5 that functions as a charge control unit, a secondary battery 6, A plus terminal 7A, a minus terminal 7B, an electronic circuit 8, a charging coil detection unit 9, a loop antenna 10, an information communication circuit 11 functioning as an information communication unit, and a frequency setting unit 12 are provided.

  The information communication circuit 11 is realized by a non-contact IC (Integrated Circuit) chip such as Felica (registered trademark) and NFC (Near Field Communication), and performs information communication by short-range wireless communication via the loop antenna 10.

  The charging coil detection unit 9 functions as a first lid mounting signal output unit. The charging coil detection unit 9 indicates that the first lid 2A is attached when the first lid 2A provided with the charging coil 21 is attached to the mobile terminal body 1. A charging coil detection signal is output as a lid mounting signal.

  Specifically, the charging coil detector 9 monitors the impedance value between the terminals of the capacitive element 3 and monitors the resonance frequency of the capacitive element 3 when the terminals are short-circuited. When a change occurs in the resonance frequency, it is detected that the charging coil 21 of the first lid 2A is connected to the capacitive element 3. In this way, the charging coil detector 9 is configured such that when the terminals 211 and 212 of the charging coil 21 provided on the first lid 2A are connected to the rectifier circuit 4 via the capacitive element 3, The charging coil detection signal is output.

  The frequency setting unit 12 performs information communication by the information communication circuit 11 when the charging coil detection signal is output by the charging coil detection unit 9 and when the charging coil detection signal is not output. Set the frequency of the radio wave used to a different frequency. Here, when the charging coil detection signal is output, the first lid 2A is attached to the portable terminal body 1, and when the charging coil detection signal is not output, the second terminal 2A is connected to the portable terminal body 1. The lid 2B is attached.

  The mobile terminal device 100 according to the present embodiment having the loop antenna 10 and the information communication circuit 11 has a short-range wireless communication function, and information is transmitted via the loop antenna 301 of a transmission side device such as the non-contact communication reader / writer 300. By receiving the radio wave transmitted by the communication circuit 302 with the loop antenna 10 of the mobile terminal device 100, information communication by short-range wireless communication can be performed. At this time, the mobile terminal device 100 is brought close to the non-contact communication reader / writer 300 so that the reference position mark 23 attached to the mobile terminal device 100 overlaps the reference position mark attached to the non-contact communication reader / writer 300. Alternatively, information communication by short-range wireless communication is performed by abutting.

  In the mobile terminal device 100 of the present embodiment, when the first lid 2A provided with the charging coil 21 is attached, and the second lid 2B not provided with the charging coil 21 is attached. Sometimes, the frequency setting unit 12 sets the frequency of the radio wave used for information communication to a different value. Therefore, even if either the first lid 2A or the second lid 2B is attached. Information communication by short-range wireless communication can be suitably performed.

  The frequency setting unit 12 is used for information communication by the information communication circuit 11 when the charging coil detection signal is output by the charging coil detection unit 9 than when the charging coil detection signal is not output. It is preferable to set the frequency of the radio wave to a high value. As a result, the mobile terminal device 100 can suitably perform information communication by short-range wireless communication regardless of whether the first lid 2A or the second lid 2B is attached. .

  In the present embodiment, when the charging coil detection signal is output by the charging coil detector 9, that is, when the first lid 2A is attached to the mobile terminal body 1, the frequency setting unit 12 The frequency of the radio wave used for information communication by the communication circuit 11 is set to 13.66 MHz. Further, the frequency setting unit 12 is configured to display the information communication circuit 11 when the charging coil detection signal is not output by the charging coil detection unit 9, that is, when the second lid 2 </ b> B is attached to the mobile terminal body 1. The frequency of the radio wave used for information communication is set to 13.56 MHz. As a result, the mobile terminal device 100 can suitably perform information communication by short-range wireless communication regardless of whether the first lid 2A or the second lid 2B is attached. .

  FIG. 4 is a diagram for explaining the frequency switching operation by the frequency setting unit 12. FIG. 5 is a flowchart showing the frequency switching operation by the frequency setting unit 12.

  The frequency setting unit 12 makes one of the first line 121 and the second line 122 connected to the loop antenna 10 conductive by the switch unit SW, so that the radio wave used for information communication by the information communication circuit 11 is transmitted. Change the frequency setting.

  For example, when the inductance value of the loop antenna 10 is 1 μH, a fixed capacitance element 1211 having a capacitance value of 130 pF and a variable capacitance element 1212 having a capacitance value of 6 pF are connected in series to the first line 121. The second line 122 is connected in parallel to the first line 121, and a fixed capacitance element 1221 having a capacitance value of 130 pF and a variable capacitance element 1222 having a capacitance value of 8 pF are connected in series to the second line 122. .

  In step S <b> 1, the frequency setting unit 12 determines whether or not the charging coil detection signal is output by the charging coil detection unit 9. When the frequency setting unit 12 determines that the charging coil detection signal is output, the process proceeds to step S2, and when it is determined that the charging coil detection signal is not output, the process proceeds to step S3.

  In step S2, the frequency setting unit 12 switches the switch unit SW so that the first line 121 is in a conductive state.

  As described above, the frequency setting unit 12 switches the switch unit SW so that the first line 121 is in a conductive state when the charging coil detection signal is output by the charging coil detection unit 9, thereby The frequency of the radio wave used for information communication by the communication circuit 11 can be set to 13.66 MHz.

  In step S <b> 3 after it is determined in step S <b> 1 that the charging coil detection signal is not output, the frequency setting unit 12 switches the switch unit SW so that the second line 122 becomes conductive.

  As described above, the frequency setting unit 12 switches the switch unit SW so that the second line 122 is in a conductive state when the charging coil detection signal is not output by the charging coil detection unit 9, thereby The frequency of the radio wave used for information communication by the communication circuit 11 can be set to 13.56 MHz.

  Returning to FIG. 1, the mobile terminal device 100 of the present embodiment has a contactless charging function. Based on FIG. 1, the structure of the portable terminal device 100 for implement | achieving a non-contact charge function and the structure of the charging device 200 are demonstrated.

  As a configuration for realizing the contactless charging function in the mobile terminal device 100, the mobile terminal body 1 includes a capacitive element 3, a rectifier circuit 4, a charge control circuit 5, a secondary battery 6, a positive terminal 7 </ b> A, a negative terminal 7 </ b> B, And an electronic circuit 8 is provided. The charging device 200 also includes a power feeding coil 201, a coil driver circuit 202, a control circuit 203, a booster circuit 204, an AC adapter 205, and an AC plug plug 206.

  First, the charging device 200 will be described. The AC plug plug 206 is a plug for connecting to an outlet of a commercial AC power supply having a frequency of, for example, 50 Hz or 60 Hz. The AC adapter 205 serving as an AC / DC converter converts the AC voltage of the commercial AC power supplied via the AC plug 206 into a DC voltage, and supplies the converted DC voltage to the booster circuit 204. The booster circuit 204 boosts the DC voltage supplied from the AC adapter 205 to a voltage necessary for contactless power feeding, and supplies the boosted DC voltage to the coil driver circuit 202.

  The control circuit 203 controls the coil driver circuit 202. The coil driver circuit 202 converts the DC voltage supplied from the booster circuit 204 into an AC voltage having a high frequency, for example, 105 Hz to 1.4 MHz, in accordance with an instruction from the control circuit 203, and the converted AC voltage is supplied to the power supply coil 201. Apply.

  The feeding coil 201 forms an alternating magnetic field symmetrically on both sides of the planar coil when the alternating voltage from the coil driver circuit 202 is applied. The feeding coil 201 is electromagnetically coupled to the charging coil 21 provided on the first lid 2 </ b> A in the mobile terminal device 100, and supplies power for charging the secondary battery 6 to the charging coil 21.

  Since the charging device 200 can increase the voltage and convert it into a high-frequency AC voltage by the AC adapter 205, the booster circuit 204, and the coil driver circuit 202, a commercial AC power source is used for charging as a power supply source. Can do.

  When the charging coil detection signal is output by the charging coil detector 9, that is, when the first lid 2 </ b> A is attached to the mobile terminal body 1, the mobile terminal device 100 of the present embodiment is A contactless charging function is developed.

  When the secondary battery 6 provided in the mobile terminal main body 1 is contactlessly charged by the charging device 200, the mobile terminal device 100 includes the charging coil 21 provided in the first lid 2 </ b> A by the power supply coil 201. It is arrange | positioned with respect to the charging device 200 so that it may be located in an alternating current magnetic field. The charging coil 21 located in the AC magnetic field formed by the power supply coil 201 outputs AC power by being electromagnetically coupled to the power supply coil 201.

  The capacitive element 3 is connected in parallel with the charging coil 21. The capacitive element 3 and the charging coil 21 constitute a parallel resonance circuit. The resonance frequency of the capacitive element 3 and the charging coil 21 is a frequency that approximates the frequency of power transfer from the feeding coil 201.

  The AC power output from the charging coil 21 is supplied to the rectifier circuit 4. The rectifier circuit 4 includes, for example, a diode and a smoothing capacitor, converts AC power output from the charging coil 21 into DC power, and outputs smoothed DC power.

  The DC power output from the rectifier circuit 4 is supplied to the charge control circuit 5. The charging control circuit 5 connects the secondary battery 6 and the rectifier circuit 4, and charges the secondary battery 6 with DC power output from the rectifier circuit 4. The charging control circuit 5 controls the charging current supplied to the secondary battery 6 according to the state of the secondary battery 6 so that the secondary battery 6 is charged with an appropriate current.

  The secondary battery 6 has a positive potential side connected to the plus terminal 7A and a ground potential side connected to the minus terminal 7B. The plus terminal 7A and the minus terminal 7B are connected to an electronic circuit 8 that is a load. The secondary battery 6 supplies DC power charged to the secondary battery 6 to the electronic circuit 8 via the plus terminal 7A and the minus terminal 7B. The electronic circuit 8 is a circuit for realizing the function of the mobile terminal device 100. For example, if the mobile terminal device 100 is a mobile phone device, the electronic circuit 8 is a circuit for realizing a communication function.

  Thus, the portable terminal device 100 of the present embodiment is a portable terminal device having a contactless charging function when the first lid 2A provided with the charging coil 21 is attached.

DESCRIPTION OF SYMBOLS 1 Mobile terminal main body 2A 1st cover body 2B 2nd cover body 3 Capacitance element 4 Rectification circuit 5 Charge control circuit 6 Secondary battery 7A Positive terminal 7B Negative terminal 8 Electronic circuit 9 Charging coil detection part 10 Loop antenna 11 Information communication circuit 12 Frequency Setting Unit 21 Charging Coil 22 Magnetic Sheet 23 Reference Position Mark 100 Mobile Terminal Device

Claims (5)

A mobile terminal body in which a secondary battery is stored;
A first lid that is detachably attached to the mobile terminal body and provided with a charging coil that outputs AC power by electromagnetic induction;
A second terminal body that is detachably attached to the portable terminal body and is not provided with a charging coil, and a portable terminal device comprising:
The first lid and the second lid are attached to the mobile terminal body so as to be interchangeable with each other,
In the mobile terminal body,
A loop antenna,
An information communication unit for performing information communication by short-range wireless communication via the antenna;
A first lid mounting signal output unit that outputs a first lid mounting signal indicating that the first lid is mounted when the first lid is mounted on the mobile terminal body;
When the first lid mounting signal output unit is outputting the first lid mounting signal, the AC power output from the charging coil provided in the first lid is converted into DC power, A power converter that outputs the converted DC power;
A charge controller that connects the secondary battery and the power converter, and charges the secondary battery with DC power output from the power converter;
When the first lid mounting signal is output by the first lid mounting signal output unit and when the first lid mounting signal is not output, it is used for information communication by the information communication unit. And a frequency setting unit that sets the frequency of the radio wave to a different frequency.   The first lid mounting signal output unit outputs the first lid mounting signal when the charging coil provided in the first lid is connected to the power conversion unit. The portable terminal device according to claim 1.   When the first lid mounting signal is output by the first lid mounting signal output unit, the frequency setting unit is more capable of transmitting the information communication unit than when the first lid mounting signal is not output. The mobile terminal device according to claim 1, wherein the frequency of the radio wave used for information communication is set to a high value. The frequency setting unit includes:
When the first lid mounting signal output unit outputs the first lid mounting signal, the radio wave frequency used for information communication by the information communication unit is set to 13.66 MHz,
The radio wave frequency used for information communication by the information communication unit is set to 13.56 MHz when the first lid mounting signal output unit does not output the first lid mounting signal output unit. 3. The mobile terminal device according to 3.   The first lid body and the second lid body are provided with a figure that serves as a mark for a position to be brought close to or in contact with the communication body when information communication is performed via the antenna. The portable terminal device according to any one of claims 1 to 4.

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