JP2006121339A - Mobile information processing terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent interference between coil antennas provided in a plurality of housing during non-contact near field communication by electromagnetic coupling. <P>SOLUTION: A non-contact data communication system 1 comprises a mobile telephone 10 having an antenna for non contact communication and a reader/writer 50 which writes and reads data to and from the mobile telephone 10 in a non-contact manner, and the mobile telephone 10 is equipped with a 1st housing 10a in which a display screen is incorporated and a 2nd housing 10b in which operation buttons etc., are incorporated, and looped coil antennas are incorporated in the 1st housing 10a and 2nd housing 10b. When they are turnably connected together, winding directions of the looped coil 13a and looped coil 13b to an electromagnetic field from the reader writer 50 become different in an open state and a closed state, so each looped coil is provided with a rectifying circuit which make the output current from the looped coil always equal to that of post stage circuit constitution so that currents generated in the looped coil 13a and looped coil 13b do not interfere with each other. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a portable information processing terminal provided with data communication means for writing and reading data to and from a non-contact IC card, a wireless tag or the like that inductively couples an electromagnetic field.

  In recent years, so-called RFID (Radio Frequency IDentification) systems using non-contact IC cards and wireless tags have been introduced in the fields of railway automatic ticket gates, security systems for entering and exiting buildings, electronic money systems, etc. Being started. As schematically shown in FIG. 7, the RFID system includes a non-contact IC card 100 and a read / write device (hereinafter referred to as a reader / writer) that writes data to and reads data from the IC card 100. 101.

  In this RF system, based on the principle of electromagnetic induction, the loop antenna 102 on the reader / writer 101 side and the loop antenna 103 on the IC card 100 side are magnetically coupled by inductive coupling, and the IC card 100 and the reader / writer 101 are connected. Communication takes place between them.

  Such an RFID system eliminates the trouble of loading an IC card or contacting a metal contact with a reader / writer like a conventional contact IC card system, so that data can be written and read out easily and at high speed. It can be carried out. In addition, in this RFID system, an induced current is generated in the IC card 100 by an electromagnetic field excited by the reader / writer 101, so that it is not necessary to have a power source such as a battery in the IC card. Therefore, it has excellent maintainability, high operational reliability, and low price.

  By the way, in the above-described RFID system, in order to ensure a sufficient communication range between the IC card 100 and the reader / writer 101, the loop antenna 102 capable of emitting an electromagnetic field having a certain magnetic field strength is provided with the reader / writer 101. Must be provided on the side.

  In general, the loop antenna 102 for the reader / writer 101 is composed of a loop coil 200 in which a conducting wire is wound in a planar shape as shown in FIG. 8, and the loop coils 200 are opposed to each other across the central portion. It has a symmetrical shape with equal spacing and line width between the windings. Specific examples of these include a main body antenna connected to the Reader / Writer module (see, for example, Patent Document 1) and AG1, AG2, AG3 of the read / write device RW2 (see, for example, Patent Document 2). .) Etc.

  In these reader / writer antennas, in order to efficiently drive the antenna drive circuit and efficiently electromagnetically couple the communication carrier wave to the RFID tag antenna or the IC card antenna, the reader / writer IC drive circuit method and power supply voltage used An antenna circuit corresponding to the characteristics of the circuit is used.

  For example, when a portable information processing terminal, a portable telephone device, or the like is applied to an RFID system, the configuration of the IC card 100 may be mounted on the device side. In particular, since the reader / writer antenna is a loop antenna formed of a planar coil, when the configuration of the IC card 100 is mounted inside the housing of the apparatus 300 as shown in FIG. A loop antenna 102 can be mounted parallel to 301.

Japanese Patent Laid-Open No. 10-144048 JP 2001-331829 A

  In recent years, in order to meet the demand for miniaturization, a portable type has a structure in which the operation unit and the display unit are folded in two by a hinge structure, etc., and the operation unit and the display unit are overlapped and opened and closed in a sliding manner. Electronic equipment has appeared.

  For example, it is conceivable that a two-fold type portable telephone device is provided with loop antennas in both housings so that data can be transmitted and received on either side when it is closed with a read / write device. In such a case, if the loop coil antenna is mounted so that the direction of the induced current generated in both loop coil antennas is induced by the magnetic field generated on the read / write device side with the portable telephone device open, it is closed. When this occurs, both loop antennas overlap, and the direction of the two loop coil antennas with respect to the direction of the magnetic field is reversed, resulting in problems such as the reception voltage being weakened and the communication distance being shortened. On the other hand, when the loop coil antenna is mounted so that the directions of the induced currents generated in both loop coil antennas are induced by the magnetic field generated on the read / write device side with the portable telephone device closed. When opened, the direction of the two loop coil antennas is reversed with respect to the direction of the magnetic field, and there is a problem that the reception voltage is weakened and the communication distance is shortened.

  Therefore, the present invention has been proposed in view of such conventional circumstances, and in non-contact proximity communication by electromagnetic coupling, loop coil antennas provided in a plurality of cases interfere with each other's antenna efficiency. An object of the present invention is to provide a portable information processing terminal including a non-contact proximity communication antenna.

  In order to achieve the above-described object, a portable information processing terminal according to the present invention is capable of rotating a first housing having a first usage surface and a second housing having a second usage surface. Connected to each other, and can be used in a state in which the use surfaces of each other face each other and in a state in which the use surfaces of each other are developed on substantially the same surface, and between the loop coil antennas of other data communication devices. In a portable information processing terminal including a non-contact communication antenna that transmits at least data in a non-contact manner by inductive coupling, a first loop coil antenna in which a conducting wire is wound in a planar shape is parallel to the first use surface A data storage means provided in the first housing, provided with a second loop coil antenna in which a conducting wire is wound in a plane, in the second housing parallel to the second use surface, and storing data; For loop antennas on other data communication devices A rectifying means for rectifying the induced current generated in the first loop coil antenna by the induced magnetic field and the induced current generated in the second loop coil antenna by the magnetic field, and the electric signal rectified by the rectifying means Demodulating means for demodulating, and control means for executing processing for storing write data in the data storage means or reading data stored in the data storage means based on the data demodulated by the demodulation means. As a result, the portable information processing terminal according to the present invention sets reverse voltages in the same direction when induced currents in opposite directions are generated in the first loop coil antenna and the second loop coil antenna.

  Even if the first loop coil antenna and the second loop coil antenna are wound in the same direction with the first casing and the second casing closed, they are in the same direction in the opened state. It may be wound around. In any case, the induced current generated in the other loop coil antenna is reversed with respect to the induced current generated in one loop coil antenna.

  In the portable information processing terminal according to the present invention, the first housing having the first usage surface and the second housing having the second usage surface are rotatably connected to each other. It can be used in a state in which the use surfaces face each other and in a state in which the use surfaces are spread on substantially the same surface, and at least by non-contact by electromagnetic induction coupling with the loop coil antenna of another data communication device. In a portable information processing terminal including a non-contact communication antenna for transmitting data, a first loop coil antenna provided in a first casing parallel to a first use surface and having a conductive wire wound in a planar shape A first rectifier that rectifies the induced current generated in the first loop coil antenna by being induced by the magnetic field generated by the loop antenna on the other data communication device side, and the electric current rectified by the first rectifier Demodulate the signal A first signal processing unit having a demodulating means, a second loop coil antenna provided in a second casing parallel to the second use surface and having a conducting wire wound in a planar shape, and guided to a magnetic field Second signal processing comprising second rectifying means for rectifying the induced current generated in the second loop coil antenna and second demodulating means for demodulating the electric signal rectified by the second rectifying means And a data storage means for storing data, and selects either the first signal processing unit or the second signal processing unit according to the open / closed state of the first casing and the second casing And a control means for executing a process of storing the data for writing in the data storage means or reading the data stored in the data storage means based on the data demodulated in the selected signal processing section.

  In addition, the portable information processing terminal according to the present invention is induced in the voltage of the induced current generated in the first loop coil antenna by the magnetic field generated by the loop antenna on the other data communication apparatus side and the second loop coil antenna. You may provide the voltage detection means which detects the voltage of the induced current which arises. At this time, the control unit selects the signal processing unit having a large induced current voltage detected by the voltage detection unit, and stores the write data in the data storage unit based on the data demodulated by the selected signal processing unit. Or reading the data stored in the data storage means.

  The portable information processing terminal according to the present invention also includes a first error detecting means for detecting an error in the data demodulated in the first signal processing unit and an error in the data demodulated in the second signal processing unit. You may provide the 2nd error detection means to detect. At this time, the control means compares the error detected by the first error detection means with the error detected by the second error detection means, and outputs the data demodulated in the signal processing unit with few detected errors. Based on this, the processing for storing the write data in the data storage means or reading the data stored in the data storage means is executed.

  Further, the portable information processing terminal according to the present invention is guided by the magnetic field generated by the loop antenna on the other data communication device side in accordance with the open / closed states of the first casing and the second casing. There may be provided switching means for switching the direction of adding the induced current voltage generated in the second loop coil antenna and the induced current voltage generated in the second loop coil antenna. At this time, the control means stores the write data in the data storage means or reads out the data stored in the data storage means based on the data demodulated in the signal processing unit that demodulates the electric signal added by the switching means. Execute the process.

  According to the portable information processing terminal according to the present invention, in non-contact proximity communication by electromagnetic coupling, an induced current generated in the first loop coil antenna by being induced by the magnetic field generated on the data communication device side for recording and reproduction; Since the induced current generated in the second loop coil antenna is induced by the magnetic field and rectified, the loop coil antennas provided in a plurality of cases do not interfere with each other's antenna efficiency and prevent deterioration in communication quality it can.

  The present invention is a portable information processing terminal applied to a so-called RFID (Radio Frequency IDentification) system using a non-contact type IC card, a wireless tag, etc., and a memory corresponding to a memory unit of the IC card and the wireless tag. A planar coil antenna for non-contact communication (hereinafter referred to as a loop coil antenna) that includes at least a partial and non-contact proximity communication circuit and transmits at least data to and from a reader / writer device by non-contact by electromagnetic inductive coupling Some parts are marked as.) In particular, the portable information processing terminal shown in the embodiment is a portable telephone device (hereinafter referred to as a cellular phone), and a display screen and an operation surface including an operation unit are rotatably connected by a hinge or the like. It is a so-called two-fold type mobile phone that can be used in a “closed state” in which the use surfaces of each other are opposed to each other and in an “open state” in which the use surfaces of each other are developed on substantially the same surface. . In the present invention, when a flat coil antenna for non-contact communication is built in the display unit and the operation unit of the two-fold type mobile phone, interference of dielectric voltage generated in both antennas is prevented and the antenna efficiency is not lowered. A method that enables data transmission and reception is proposed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  A non-contact data communication system 1 shown as a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, a contactless data communication system 1 includes a mobile phone 10 having an antenna for contactless communication, and a reader / writer 50 that writes and reads data to and from the mobile phone 10 in a contactless manner. Consists of

  The mobile phone 10 includes a first housing 10a in which a display screen as a first usage surface is incorporated, and a second housing 10b in which operation buttons and the like are incorporated as a second usage surface. Are rotatably connected. A first loop coil antenna, in which a conducting wire is wound in a plane, is built in the first casing 10a in parallel with the use surface, and a conducting wire is wound in a plane in the second casing 10b. The second loop coil antenna is built in parallel to the use surface. The mobile phone 10 has a built-in communication circuit similar to a batteryless IC card having no power source such as a battery conforming to ISO7810.

  In addition to the basic configuration for communication as a mobile phone, the mobile phone 10 is connected to an external electromagnetic field on a substrate provided inside, and is connected to an external electromagnetic field to transmit / receive data to and from the loop coil antenna circuits 11a and 11b. And an integrated circuit (IC) 12 in which electronic circuits for performing various processes for writing and reading are performed.

  The telephone side loop coil antenna circuit 11a is built in the first casing 10a, and the telephone side loop coil antenna circuit 11b is built in the second casing 10b. a and b are used to distinguish and represent the two loop coil antenna circuits provided in the first casing 10a and the second casing 10b, but since the same configuration can be applied to both, However, a and b are not distinguished except when each explanation is necessary.

  As an example of the telephone-side loop coil antenna circuit 11, a resonant antenna circuit or the like in which a conductive wire is wound in a planar shape and a loop coil 13 as a loop coil antenna and a capacitor 14 are connected in parallel can be applied. The loop coil 13a in the telephone-side loop coil antenna circuit 11a and the loop coil 13b in the telephone-side loop coil antenna circuit 11b are radiated by the reader / writer 50 with the first casing 10a and the second casing 10b closed. It is wound so as to be in the same direction with respect to the electromagnetic field. The telephone-side loop coil antenna circuit 11 is electromagnetically coupled to an electromagnetic field radiated from a reader / writer antenna circuit 54 on the reader / writer 50 side described later, converts the combined electromagnetic field into an electric signal, and supplies the electric signal to the IC 12.

  The IC 12 includes a rectifier circuit 15a as a rectifier for rectifying and smoothing an electric signal generated in the telephone-side loop coil antenna circuit 11a induced by an electromagnetic field generated by the antenna of the reader / writer 50, and a telephone-side loop coil antenna circuit 11b. And a rectifier circuit 15b as a rectifier for rectifying and smoothing an electric signal generated as an induced current. Further, a regulator 16 that converts electric signals supplied from the rectifier circuits 15a and 15b into DC power, an HPF (High Pass-Filter) 17 that extracts high frequency components of the electric signals supplied from the rectifier circuits 15a and 15b, and , A demodulation circuit 18 that demodulates a signal of a high-frequency component input from the HPF 17, a sequencer 19 that controls writing and reading of data corresponding to the data supplied from the demodulation circuit 18, and a demodulation circuit 18 A memory 20 that stores data and a modulation circuit 21 that modulates data transmitted by the loop coil 13 are included.

  The rectifier circuit 15 includes a diode 22, a resistor 23, and a capacitor 24. Among these, the anode terminal of the diode 22 is connected to one end of the loop coil 13 and the capacitor 14, the cathode terminal of the diode 22 is connected to one end of the resistor 23 and the capacitor 24, and the other end of the resistor 23 and the capacitor 24 is connected to the loop coil 13. And the other end of the capacitor 14. The rectifier circuit 15 outputs an electric signal obtained by rectifying and smoothing the electric signal supplied from the loop coil 13 to the regulator 16 and the HPF 17.

  The regulator 16 is connected to the cathode terminal of the diode 22, the resistor 23, and one end of the capacitor 24 of the rectifier circuits 15 a and 15 b described above. The regulator 16 suppresses the voltage fluctuation (data component) of the electric signal supplied from the rectifier circuits 15a and 15b, stabilizes it, and supplies it to the sequencer 19 as DC power. As a result, voltage fluctuations caused by, for example, the movement of the position of the mobile phone 10, and voltage fluctuations caused by changes in power consumption in the mobile phone 10, which cause malfunction of the sequencer 19 or the like, are suppressed.

  The HPF 17 includes a capacitor 25 and a resistor 26, extracts a high frequency component of the electric signal supplied from the rectifier circuits 15 a and 15 b described above, and outputs the high frequency component to the demodulation circuit 18.

  The demodulating circuit 18 is connected to the other end of the capacitor 25 of the HPF 17 and one end of the resistor 26, and demodulates the high frequency component signal input from the HPF 17 and outputs it to the sequencer 19.

  The sequencer 19 has a ROM (Read Only Memory) and a RAM (Random Access Memory) inside, and is connected to the demodulation circuit 18 described above. The sequencer 19 stores the signal (command) input from the demodulation circuit 18 in the RAM, analyzes it according to the program built in the ROM, and based on the analyzed result, if necessary. Data stored in the memory 20 is read. Alternatively, the data supplied from the demodulation circuit 18 is written in the memory 20. The sequencer 19 generates a response signal corresponding to the command and supplies it to the modulation circuit 21.

  As a method for supplying power to the sequencer 19, as described above, in addition to supplying the stabilized DC power by rectifying the induced electromotive force generated in the loop coil 13 by the electromagnetic field radiated by the reader / writer antenna circuit 54, Power may be supplied from the battery of the telephone 10 via the regulator 16.

  The memory 20 can be a non-volatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory) that does not require power to hold data, and is connected to the sequencer 19 described above. The memory 20 stores data supplied from the demodulation circuit 18 based on the analysis result of the sequencer 19.

  The modulation circuit 21 is composed of a series circuit of an impedance 27 and a field effect transistor (FET) 28, of which one end of the impedance 27 is connected to the cathode terminal of the diode 22 of the rectifier circuit 15 described above. The other end of the FET 28 is connected to the drain terminal of the FET 28, the source terminal of the FET 28 is connected to the ground point, and the gate terminal of the FET 28 is connected to the sequencer 19. The modulation circuit 21 is connected in parallel with the loop coil 13 constituting the above-described resonance circuit, and causes the FET 28 to perform a switching operation in response to a signal from the sequencer 19 to load the loop coil 13 with an impedance 27. A so-called load modulation method is used.

  On the other hand, the reader / writer 50 includes a modulation circuit 52 and a demodulation circuit 53 that modulate and demodulate data, and a reader / writer antenna circuit 54 that transmits and receives data by being coupled with an electromagnetic field. The control circuit 51 performs overall control. The demodulation circuit 53 may be provided with a protection circuit for reducing a large signal when it is input.

  For example, the control circuit 51 generates control signals for various controls in accordance with external commands and built-in programs, controls the modulation circuit 52 and the demodulation circuit 53, and generates transmission data corresponding to the commands. This is supplied to the modulation circuit 52. Further, the control circuit 51 generates reproduction data based on the response data from the demodulation circuit 53 and outputs it to the outside.

  In the modulation circuit 52, the transmitter modulates the transmission data input from the control circuit 51, and supplies the modulated signal to the reader / writer antenna circuit 54. The demodulating circuit 53 demodulates the modulated wave from the reader / writer antenna circuit 54 and supplies the demodulated data to the control circuit 51.

  The reader / writer antenna circuit 54 includes a loop coil around which a conducting wire is wound in a planar shape, and radiates an electromagnetic field corresponding to the modulated wave supplied from the modulation circuit 52 and loads the loop coil 13 on the mobile phone 10 side. Detect fluctuations.

  In the contactless data communication system 1 configured as described above, when a command to write predetermined data is instructed to the mobile phone 10, the control circuit 51 of the reader / writer 50 receives a command signal for writing based on this command. And transmission data (write data) corresponding to the command is generated and supplied to the modulation circuit 52. The modulation circuit 52 modulates the amplitude of the oscillation signal based on the input signal and supplies it to the reader / writer antenna circuit 54. The reader / writer antenna circuit 54 emits an electromagnetic wave corresponding to the input modulation signal.

  The resonance frequency of the parallel resonance antenna circuit including the loop coil 13 and the capacitor 14 of the mobile phone 10 corresponds to the oscillation frequency (carrier frequency) from the reader / writer 50 (in this specific example, 13.56 MHz). Is set to Therefore, this parallel resonance antenna circuit receives the radiated electromagnetic field by a resonance operation, converts the received electromagnetic field into an electric signal, and then supplies the electric signal to the IC 12.

  The electric signal converted from the electromagnetic field in the telephone side loop coil antenna circuit 11 a is input to the rectifier circuit 15, rectified and smoothed, and then supplied to the regulator 16. The electric signal converted from the electromagnetic field in the telephone loop coil antenna circuit 11b is input to the rectifier circuit 15b, rectified and smoothed, and then supplied to the regulator 16. The regulator 16 suppresses and stabilizes voltage fluctuations (data components) of the electric signals supplied from the rectifier circuits 15 a and 15 b, and then supplies them to the sequencer 19 as DC power.

  The signals rectified and smoothed by the rectifier circuits 15a and 15b are supplied to the HPF 17 via the modulation circuit 21, and after the high frequency components are extracted, the signals are supplied to the demodulation circuit 18. The demodulation circuit 18 demodulates the input high frequency component signal and supplies it to the sequencer 19. The sequencer 19 stores the signal (command) input from the demodulation circuit 18 in the RAM, analyzes the signal according to the program built in the ROM, and supplies the signal from the demodulation circuit 18 based on the result obtained by the analysis. The written data is written into the memory 20.

  On the other hand, when the signal (command) input from the demodulation circuit 18 is a read command, the sequencer 19 reads the read data corresponding to the command from the memory 20. In the sequencer 19, the FET 28 of the modulation circuit 21 is switched in accordance with the read data. That is, in the modulation circuit 21, the impedance 27 and the loop coil 13 are connected in parallel when the FET 28 is turned on, and the parallel connection between the impedance 27 and the loop coil 13 is released when the FET 28 is turned off.

  As a result, the impedance of the reader / writer antenna circuit 54 on the reader / writer 50 side that is magnetically coupled to the telephone-side loop coil antenna circuit 11 on the mobile phone 10 side changes corresponding to the read data. Therefore, the terminal voltage of the reader / writer antenna circuit 54 fluctuates in accordance with the change in impedance, and the reader / writer 50 can receive read data by the demodulation circuit 53 demodulating the fluctuation. As described above, writing and reading of data between the mobile phone 10 and the reader / writer 50 are performed in a non-contact manner.

  FIG. 2 shows a “closed state” in which both use surfaces of the mobile phone 10 are opposed to each other, and FIG. 3 shows an “open state” in which both use surfaces of the mobile phone 10 are developed on substantially the same surface. Yes. 4 and 5 schematically show the direction of current induced from the electromagnetic field generated in the reader / writer 50 when the mobile phone 10 is used in a closed state and when it is used in an open state.

  Since the cellular phone 10 has the open / close structure shown in FIGS. 2 and 3, when the antenna circuit is provided in both of the two main body parts, the reader / writer 50 can be opened and closed. The winding direction of the loop coil 13a and the loop coil 13b with respect to the electromagnetic field is different.

  In FIG. 4, Ha represents the strength of the magnetic field that the loop coil 13a of the telephone side loop coil antenna circuit 11a receives from the reader / writer 50, and Hb represents the magnetic field that the loop coil 13b of the telephone side loop coil antenna circuit 11b receives from the reader / writer 50. Represents the strength of FIG. 4 shows a case where the first housing 10a side is held over the reader / writer 50. In this case, since the magnetic field applied by the loop coil 13b is shielded by the first housing 10a, Ha> Hb It has become. Ia represents an induced current generated in the loop coil 13a by Ha, and Ib represents an induced current generated in the loop coil 13b by Hb. The cellular phone 10 is wound so that the loop coil 13a and the loop coil 13b are in the same direction with respect to the electromagnetic field radiated by the reader / writer 50 with the first casing 10a and the second casing 10b closed. Therefore, in the closed state, Ia and Ib are in the same direction.

  On the other hand, in the opened state as shown in FIG. 5, in the mobile phone 10, the loop coil 13 a and the loop coil 13 b are radiated by the reader / writer 50 with the first casing 10 a and the second casing 10 b closed. Since it is wound in the same direction with respect to the electromagnetic field, Ia and Ib are in opposite directions when opened. The magnitudes of the magnetic fields Ha and Hb applied to the loop coil 13a and the loop coil 13b are different from each other in that the strength of the magnetic field is reduced on the first housing 10a side located away from the electromagnetic field irradiation region of the reader / writer 50. Is considered. H ′ and I ′ represent the magnetic field and current generated when the second case 10 b is held over the reader / writer in the opposite direction.

  Therefore, in this specific example, a rectifier circuit in which the output current from each loop coil is always in the same direction with respect to the circuit configuration of the subsequent stage is provided in each loop coil so that currents generated in the loop coil 13a and the loop coil 13b do not interfere with each other. Provided.

  Therefore, the cellular phone 10 is connected to the first housing with the reader / writer 50 without losing the antenna efficiency regardless of whether the cellular phone 10 is closed or opened as shown in FIGS. Data can be transmitted and received on the surface of either 10a or the second housing 10b.

  Next, a non-contact data communication system 2 shown as a second embodiment of the present invention will be described with reference to FIG.

  The non-contact data communication system 2 shown in FIG. 6 is a high-frequency circuit for data transmission / reception for each antenna as another countermeasure against the difference in the direction of current generated in the antenna between the closed state and the open state in the cellular phone 30. This is an example in which a system and a signal processing system are provided.

  The cellular phone 30 in the non-contact data communication system 2 includes a first casing 10a in which a display screen as a first usage surface is incorporated, an operation button or the like as a second usage surface, like the cellular phone 10 described above. And a second housing 10b in which are incorporated, and these are rotatably connected. The first casing 10a has a first loop coil antenna in which a conducting wire is wound in a flat shape and is built in parallel to the use surface, and the second casing has a conducting wire wound in a planar shape. A second loop coil antenna is built in parallel to the use surface.

  Similar to the mobile phone 10, the mobile phone 30 has a basic configuration for communication as a mobile phone, and in addition to this, on the substrate provided inside, a phone-side loop that couples with an external electromagnetic field and transmits / receives data The coil antenna circuits 11a and 11b and the rectifier circuit 15, the regulator 16, the HPF 17, the demodulation circuit 18, and the modulation circuit 21 as a signal processing system for performing various signal processing for data writing and reading are provided for each telephone side loop coil antenna circuit. Is provided.

  The telephone side loop coil antenna circuit 11a is built in the first casing 10a, and the telephone side loop coil antenna circuit 11b is built in the second casing 10b. a and b are used to distinguish and represent the two loop coil antenna circuits provided in the first casing 10a and the second casing 10b, but since the same configuration can be applied to both, However, a and b are not distinguished except when each explanation is necessary. Further, components having the same functions as those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  The cellular phone 30 includes a telephone-side loop coil antenna circuit 11a, a rectifier circuit 15a, a regulator 16a, an HPF 17a, a demodulation circuit 18a, an electric signal from a first signal processing system including a modulation circuit 21a, and a telephone-side loop coil antenna circuit 11b. A selection circuit 31 that selects any one of the electric signals from the second signal processing system including the rectifier circuit 15b, the regulator 16b, the HPF 17b, the demodulation circuit 18b, and the modulation circuit 21b. In addition, the mobile phone 10 includes a detection sensor 32 that detects whether the first housing 10a and the second housing 10b are in a closed state or an open state.

  The control unit 33 compares the error of the data demodulated in the demodulation circuit 18a with the error of the data demodulated in the demodulation circuit 18b, and stores the memory based on the data demodulated in the signal processing system with few detected errors. Data for writing is stored in 20. Alternatively, a process of reading data stored in the memory 20 is executed.

In addition, the control unit 33 and the telephone-side loop coil antenna circuit 11a are connected to the telephone side by the electromagnetic field that is induced and radiated by the magnetic field generated by the reader / writer antenna circuit 54 according to the open / closed state of the housing detected by the detection sensor 32. The direction in which the voltage of the induced current generated in the side loop coil antenna circuit 11b is added is switched. Then, the write data is stored in the memory 20 based on the data demodulated by the demodulation circuit 18 that demodulates the added electric signal. Alternatively, a process of reading data stored in the memory 20 is executed.

  Further, the control unit 33 monitors the voltage of the output current of the regulators 16a and 16b, so that the signal processing system having the higher output value is independent of the open / closed state of the first casing 10a and the second casing 10b. The electrical signal from can also be selected. For example, when in the open state, the strength of the magnetic field decreases on the housing side away from the electromagnetic field irradiation region of the reader / writer 50, so the control unit 33 is a signal that generates a weak reverse current. Shut off the processing system.

  In the non-contact data communication system 1 configured as described above, in particular, as shown in FIG. 3, both the loop coils 13 a and 13 b against the electromagnetic field from the reader / writer 50 when the mobile phone 30 is open. Even if the direction of the current induced by the signal is different, the signal processing system is switched according to the opening / closing and according to the voltage of the output current of the regulators 16a and 16b, so that the reader efficiency is not impaired. Data can be transmitted to and received from the writer 50 from either side of the first casing 10a and the second casing 10b.

  The portable information processing terminal according to the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. For example, the information processing terminal such as a PDA (Personal Digital Assistants) or a small PC (Personal Computer) is not limited to the mobile phone shown as the embodiment, and the main body portion incorporating the loop coil antenna is operable. The present invention can be applied to the case where the positional relationship between the loop coil and the magnetic field is partially different and an induced current in the reverse direction is generated.

It is a block diagram explaining the non-contact data communication system shown as an Example of this invention. It is the schematic explaining the case where it uses in the state which closed the mobile phone applied to the said non-contact data communication system. It is the schematic explaining the case where it uses in the state which opened the said mobile telephone. It is a figure explaining the current excited by the reader / writer antenna circuit and its direction when the mobile phone is used in a closed state. It is a figure explaining the electric current excited by the reader / writer antenna circuit and its direction when using it in the state which opened the said mobile phone. It is a block diagram explaining the non-contact data communication system shown as 2nd Example of this invention. It is the schematic explaining the conventional RFID system. It is the schematic diagram explaining the loop antenna in the conventional RFID system. It is a figure which shows the example which mounted the loop antenna in the housing | casing of the apparatus in parallel with the use surface.

Explanation of symbols

1, 2 contactless data communication system, 10 mobile phone, 11 telephone side loop coil antenna circuit, 12 IC, 13 loop coil, 14 capacitor, 15 rectifier circuit, 16 regulator, 17 HPF, 18 demodulator circuit, 19 sequencer, 20 memory , 21 Modulation circuit

Claims (9)

A state in which the first housing having the first use surface and the second housing having the second use surface are rotatably connected to face each other's use surface, A portable phone equipped with a non-contact communication antenna that can be used in a state where it is deployed on substantially the same plane, and transmits at least data by non-contact by electromagnetic induction coupling with a loop coil antenna of another data communication device. Type information processing terminal,
A first loop coil antenna in which a conducting wire is wound in a plane is provided in the first casing in parallel with the first use surface,
A second loop coil antenna having a conductive wire wound in a plane is provided in the second casing in parallel with the second use surface,
Data storage means for storing data;
The induced current generated in the first loop coil antenna induced by the magnetic field generated by the loop antenna on the other data communication device side and the induced current generated in the second loop coil antenna induced by the magnetic field are rectified. Rectifying means;
Demodulating means for demodulating the electrical signal rectified by the rectifying means;
Control means for executing a process of storing data for writing in the data storage means based on data demodulated by the demodulating means or reading data stored in the data storage means Type information processing terminal.   The first loop coil antenna and the second loop coil antenna are wound in the same direction with the first casing and the second casing closed. The portable information processing terminal according to claim 1.   The first loop coil antenna and the second loop coil antenna are wound in the same direction with the first casing and the second casing open. The portable information processing terminal according to claim 1. A state in which the first housing having the first use surface and the second housing having the second use surface are rotatably connected to face each other's use surface, A portable phone equipped with a non-contact communication antenna that can be used in a state where it is deployed on substantially the same plane, and transmits at least data by non-contact by electromagnetic induction coupling with a loop coil antenna of another data communication device. Type information processing terminal,
A magnetic field generated by a first loop coil antenna provided in the first casing parallel to the first use surface and having a conducting wire wound in a planar shape, and a loop antenna on the other data communication device side. A first rectifier that rectifies the induced current that is induced and is generated in the first loop coil antenna; and a first demodulator that demodulates the electrical signal rectified by the first rectifier. A signal processing unit;
A second loop coil antenna provided in the second casing parallel to the second use surface and having a conducting wire wound in a planar shape, and induced in the magnetic field to be generated in the second loop coil antenna. A second signal processing unit having a second rectifying means for rectifying the induced current and a second demodulating means for demodulating the electric signal rectified by the second rectifying means;
Data storage means for storing data,
Either the first signal processing unit or the second signal processing unit is selected according to the open / closed state of the first casing and the second casing, and demodulated in the selected signal processing section A portable information processing terminal comprising: control means for executing processing for storing data for writing in the data storage means or reading data stored in the data storage means based on data. Voltage detection for detecting the voltage of the induced current generated in the first loop coil antenna and the voltage of the induced current generated in the second loop coil antenna induced by the magnetic field generated by the loop antenna on the other data communication device side With means,
The control unit selects either the first signal processing unit or the second signal processing unit according to the voltage detected by the voltage detection unit, and the data demodulated by the selected signal processing unit 5. The portable information processing terminal according to claim 4, wherein the processing for storing the write data in the data storage means or reading the data stored in the data storage means is executed based on the data. First error detecting means for detecting an error in data demodulated in the first signal processing section and second error detecting means for detecting an error in data demodulated in the second signal processing section. ,
The control means compares the error detected by the first error detection means with the error detected by the second error detection means, and the data demodulated in the signal processing unit with few detected errors. 5. The portable information processing terminal according to claim 4, wherein the processing for storing the write data in the data storage means or reading the data stored in the data storage means is executed based on the data. A voltage of an induced current generated in the first loop coil antenna by being induced by a magnetic field generated by a loop antenna on the other data communication device side according to an open / close state of the first casing and the second casing; Switching means for switching the direction of adding the voltage of the induced current generated in the second loop coil antenna;
The control means stores the data for writing in the data storage means based on the data demodulated in the signal processor for demodulating the electrical signal added by the switching means, or the data stored in the data storage means The portable information processing terminal according to claim 4, wherein a process for reading out is executed.   The first loop coil antenna and the second loop coil antenna are wound in the same direction with the first casing and the second casing closed. The portable information processing terminal according to claim 4. The first loop coil antenna and the second loop coil antenna are wound in the same direction with the first casing and the second casing open. The portable information processing terminal according to claim 4.

Images