JP2008022469A - Mobile terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal device restraining occurrence of an out-of-service area regardless of location and angle of an antenna for a noncontact IC card function, and performing communication with the noncontact IC card function. <P>SOLUTION: In the mobile terminal device, resonant coils 7, 8 forming a parasitic resonant circuit which changes impedance of an antenna coil provided in a reader/writer for the noncontact IC card are placed apart from the antenna 10 for the noncontact IC card function located in a lower housing 3 of the sliding type mobile terminal device 1, and placed inside an upper housing 2 and adjacent to an operation button unit 6 and an LCD unit 4 of the upper housing 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable terminal device having a function as a non-contact type IC card.

When operating as a non-contact IC card, a portable terminal device having a non-contact IC card function communicates with a reader / writer for the non-contact IC card at a distance of about 10 cm, for example. Communication by this non-contact type IC card function is performed by electromagnetic coupling between an antenna coil mounted on a portable terminal device and an antenna coil provided in a reader / writer such as a ticket gate, that is, data communication using radio waves. Is called. Usually, a portable terminal device is provided with an antenna coil used in the above-described non-contact type IC card function in a planar manner on an arbitrary housing surface.
Communication with the reader / writer is performed with the surface of the portable terminal device on the side where the antenna coil is disposed facing the reader / writer, and the antenna coil used for the non-contact IC card function on the same surface as the surface of the battery cover When using a portable terminal device equipped with, for example, when passing through an automatic ticket gate, the surface of the battery cover of the portable terminal device is brought close to the touch part provided on the ticket gate, and predetermined data communication is performed to check the ticket gate / The payment is processed.

For example, there is a foldable portable terminal device in which a non-contact type coil antenna is fixed to an upper housing having a liquid crystal display. This is because a non-contact coil antenna for IC interface that communicates with a reader / writer of an IC card is fixed to a flexible substrate provided in the upper casing, and the non-contact coil antenna for IC interface is softened. Electromagnetic coupling with an electronic device that performs other communication or the like by appropriately covering with a magnetic wave absorber is prevented (see, for example, Patent Document 1).
Further, there is a card type transceiver in which a dielectric substrate having a low dielectric constant and a ground plate made of a dielectric metal are laminated, and antennas having directivity are provided on both surfaces of the laminated body. Each antenna provided in the laminate is connected to a multiplier circuit, a power supply rectifier circuit, or a modulation circuit via a coupler (see, for example, Patent Document 2).

JP 2004-153463 A (pages 3 and 4, FIG. 1 and FIG. 2) Japanese Patent Laid-Open No. 2-65529 (page 3, FIGS. 1 to 3)

  Since the conventional portable terminal device having a non-contact type IC card function is configured as described above, a portion of the case of the portable terminal device where the antenna coil for the non-contact type IC card function is not arranged is a reader.・ When facing the writer, the metal member, etc. constituting the portable terminal device approaches the antenna coil of the reader / writer, and the impedance of the antenna coil changes, making it impossible to communicate using the non-contact IC card function. An area where communication is impossible, a so-called communication hole may occur. Therefore, if the antenna coil for the non-contact type IC card function is not provided, for example, if the part where the liquid crystal display is installed is brought close to the reader / writer, etc., there may be a problem in the settlement process for the non-contact type IC card function. Becomes higher. In addition, in order to prevent the occurrence of a non-communication area, when a plurality of non-contact IC card function antenna coils are appropriately arranged and connected to a circuit that performs non-contact IC card function processing, the circuit configuration and each antenna coil are There existed a subject that the structure of the housing | casing to install became complicated.

  The present invention has been made in order to solve the above-described problem, and communication by a non-contact type IC card function by suppressing the occurrence of a non-communication area regardless of the position and orientation of the antenna for the non-contact type IC card function. An object of the present invention is to obtain a portable terminal device that performs the above.

  A portable terminal device according to the present invention provides a resonance coil that forms a non-excited resonance circuit that changes the impedance of an antenna coil provided in a reader / writer for a non-contact type IC card from the antenna for the non-contact type IC card function. It is provided at a remote site.

  According to the present invention, the part of the resonance coil that forms the non-excited resonance circuit that changes the impedance of the antenna coil provided in the reader / writer for the non-contact type IC card is separated from the antenna for the non-contact type IC card function. Therefore, there is an effect that it is possible to improve the reliability of communication by the non-contact type IC card function by suppressing the occurrence of the communication impossible area with a simple configuration.

An embodiment of the present invention will be described below.
Embodiment 1 FIG.
FIG. 1 is an explanatory view showing the appearance of a portable terminal device according to Embodiment 1 of the present invention. This figure shows a schematic external appearance of the slide type mobile terminal device 1, and shows a state in which the upper housing 2 and the lower housing 3 are slid and extended. Further, this figure shows, for example, an external appearance when a liquid crystal display section (hereinafter referred to as an LCD section) 4 is viewed from the front, an external appearance when the mobile terminal device 1 is viewed from the side, and a battery equipped with a battery. The appearance of the portion 9 when viewed from the front, that is, the appearance of the back surface portion of the mobile terminal device 1 is shown in correspondence with the position of each portion. In each of the following embodiments, an antenna coil and the like related to the non-contact type IC card function will be described, and description of portions used for functions such as a telephone call and Internet communication will be omitted.

  As described above, the sliding portable terminal device 1 includes the upper housing 2 having the LCD unit 4 for displaying a screen and the lower housing 3 having the operation button unit 5 for inputting numbers and characters. The upper casing 2 is adjacent to the operation button section 5 of the lower casing 3 below the LCD section 4 with the display screen facing the front of the mobile terminal apparatus 1, specifically in a state where the mobile terminal apparatus 1 is stretched. The operation button unit 6 including a plurality of push buttons for selecting or setting the operation of the mobile terminal device 1 is provided in the part. Further, for example, in the upper casing 2, a non-excitation coil 7 indicated by a broken line in the figure is arranged around the LCD unit 4, and a resonance coil 8 indicated by a broken line in the figure is arranged around the operation button part 6. Has been. The lower housing 3 includes a non-contact type IC card function antenna 10 around the battery unit 9 inside the housing. A non-contact IC card function antenna 10 indicated by a broken line in the figure is connected to a circuit board or the like that performs a non-contact IC card function operation (not shown). For example, a battery mounted on the battery unit 9 It is a coil-shaped antenna constructed / arranged so as to be wound around the outer periphery of the like. The mobile terminal device 1 includes components used for a call function, an image shooting / display function, an e-mail creation / transmission function, and the like that are not shown and described here. Further, as will be described later, in order to secure a communication distance by the non-contact type IC card function, the mobile terminal device 1 is provided with either one of the resonance coil 7 or the resonance coil 8 and a resonance circuit.

FIG. 2 is an explanatory diagram showing a configuration of a resonance coil constituting a non-excited resonance circuit provided in the portable terminal device according to the first embodiment. This figure shows the configuration of the resonance coil 8 of the mobile communication terminal 1 illustrated in FIG. 1, and the resonance formed on the key substrate 11 on which the plurality of push buttons 6 a constituting the operation button unit 6 are mounted. The coil 8 is illustrated.
In the slide-type mobile terminal device 1 illustrated in FIG. 1, the operation button unit 6 composed of direction keys and the like is arranged at the lower part of the screen of the LCD 4, and therefore resonates with the key substrate 11 constituting the operation button unit 6. The coil 8 is formed by patterning like a coil pattern 8a in FIG. The coil pattern 8a is formed on the key substrate 11 so as to surround a portion where the plurality of push buttons 6a are mounted, that is, to wind around the operation button portion 6. FIG. 2 shows a coil pattern 8a forming the resonance coil 8 and a capacitor 8b connected in parallel to the coil pattern 8a. A non-excited parallel resonance circuit is configured by the coil pattern 8a and the capacitor 8b. For example, when the inductance of the coil pattern 8a is L and the capacitance of the capacitor 8b is C, the resonance frequency f = 1 / (2π√ (LC)). It is configured to resonate and act on load modulation of a non-contact type IC card function to be described later. Note that the capacitor 8b connected to the coil pattern 8a may be a plurality of capacitors connected in parallel as shown in FIG. Further, the resonance coil 7 shown in FIG. 1 is also arranged / fixed like a coil wound around the outer periphery of the display screen of the LCD unit 4, and a capacitor (not shown) is connected in parallel like the resonance coil 8. It constitutes a non-excited parallel resonant circuit.

  The mobile terminal device 1 illustrated in FIG. 1 includes the non-contact IC card function antenna 10 inside the housing of the device as described above, and is installed / fixed in parallel with the bottom surface of the lower housing 3. ing. Further, for example, it is installed / fixed to the upper housing 2 so that the winding portions of the resonance coils 7 and 8 are parallel to the non-contact IC card function antenna 10. The non-contact IC card function antenna 10 and the resonance coils 7 and 8 are spaced apart from each other to avoid interference with each other. The non-contact IC card function antenna 10 is disposed on the back surface side of the lower housing 3, and more specifically, disposed in the battery unit 9 in which a battery or the like is mounted inside the lower housing 3. 3, the outer surface portion of the battery unit 9, that is, the bottom surface of the lower housing 3 serves as a communication surface with the reader / writer. In addition, the direction and arrangement | positioning of the winding part of the resonant coils 7 and 8 are not restricted to what was illustrated here, but are arrange | positioned suitably so that the impedance frequency characteristic as mentioned later may be acquired.

Next, the operation will be described.
There are various types of reader / writers for non-contact type IC cards and non-contact type IC cards, and communication distances and communication areas are various. For each reader / writer and non-contact type IC card, it is necessary to ensure good communication performance, that is, to ensure a large communication distance and to suppress the occurrence of a non-communication area, and functions equivalent to the above non-contact type IC card. The above-described communication performance is also required for the portable terminal device 1 of the present invention having
Usually, communication processing by a non-contact type IC card is performed as follows. First, a carrier wave is transmitted from the reader / writer side. The non-contact type IC card existing in the carrier wave communication area detects the induced current induced in the antenna coil provided to represent the data set in advance by the termination processing of the antenna coil, for example. Perform load modulation. The reader / writer detects the impedance fluctuation of the antenna coil provided with load modulation by the non-contact type IC card, and performs data communication by demodulating the detection signal. The communication distance at this time is the strength of electromagnetic coupling between the antenna coil provided in the reader / writer and the antenna coil of the non-contact type IC card, the induced current detection capability of the non-contact type IC card, or the load modulation of the reader / writer. Depends on detection capability. However, even when a sufficiently induced current is generated on the non-contact type IC card side with a high degree of electromagnetic coupling, a communication impossible area where a load modulation cannot be detected by a reader / writer, that is, a communication hole may occur.

  The non-communication area is likely to occur as the electromagnetic coupling between the non-contact type IC card and the reader / writer becomes stronger. When performing data communication by the non-contact type IC card function between the portable terminal device 1 and the reader / writer, the battery mounted in the portable terminal device 1, the metal members such as each substrate constituting the device, and the An antenna coil or the like greatly shifts the impedance frequency characteristic of the antenna coil on the reader / writer side, and the detection voltage on the reader / writer side decreases at the carrier frequency used for data communication, making it impossible to detect load modulation. There is. In particular, when the outer surface of the casing on which the non-contact IC card function antenna 10 of the portable terminal device 1 is not placed is brought close to the reader / writer, a large communication impossible region is generated due to the influence of the metal member and the like. Even if the terminal device 1 is brought close to the reader / writer, there is a problem that the processing of the non-contact type IC card function cannot be performed.

FIG. 3 is an explanatory diagram showing a communication operation between the non-contact type IC card and the reader / writer. In this figure, the vertical axis represents impedance, the horizontal axis represents frequency, and impedance frequency characteristics when the reader / writer detects load modulation by a non-contact type IC card.
When a non-contact type IC card is present in a region where the carrier wave from the reader / writer reaches, the antenna coil provided in the non-contact type IC card reflects the carrier wave from the reader / writer. The impedance of the antenna coil changes so as to repeat the ON level and the OFF level shown in FIG. The reader / writer performs data communication with the non-contact type IC card by detecting this impedance change.

  For example, the impedance detected by the reader / writer as load modulation ON has a frequency characteristic as shown by curve A in FIG. 3, and the impedance detected as load modulation OFF has a frequency characteristic as shown by curve B. Thus, there is a portion where the curve A and the curve B overlap each other, and there is a null point N1 having the same impedance when the detected load modulation is ON and OFF. Here, since the null point N1 is different from the frequency of the carrier wave, data communication is possible. However, when the non-contact type IC card and the reader / writer are brought close to each other, the impedance frequency characteristics of the reader / writer antenna coil change due to the influence of the metal member as described above, for example, the impedance frequency indicating ON by load modulation. The characteristic becomes a curve C, and the impedance frequency characteristic indicating OFF by load modulation becomes a curve D. In the curves C and D, a null point N2 in which the impedance indicating the ON level and the level indicating the OFF level are the same value in the frequency of the carrier wave is generated, and a communication disabled area is generated.

  FIG. 4 is an explanatory diagram showing a communication operation of the non-contact IC card function of the mobile terminal device according to the first embodiment. As in FIG. 3, the vertical axis indicates impedance and the horizontal axis indicates frequency, and impedance frequency characteristics of the antenna coil of the reader / writer when detecting load modulation by the non-contact type IC card function of the mobile terminal device 1. Is shown. FIG. 4 illustrates an ideal characteristic curve for easy understanding of the description to be described later, and is different from the actual one. In the figure, the curve E shows the impedance frequency characteristic when the load modulation is ON, and the curve F shows the impedance frequency characteristic when the load modulation is OFF. A circuit that operates with a non-contact IC card function (not shown) and the antenna 10 for the non-contact IC card function resonates at the carrier frequency shown in FIG. 4 to perform data communication with the reader / writer. The configured resonance circuit resonates at a frequency different from the above carrier frequency.

  As shown in FIG. 1, when the casing of the portable terminal device 1 is appropriately provided with the resonance coil 7 or the resonance coil 8, that is, an independent non-excited resonance circuit, the portable terminal device 1 and the reader / writer are described above. When performing communication using such a non-contact type IC card function, the impedance frequency characteristics of the antenna coil of the reader / writer become curves E and F, and no null point is generated. That is, when impedance frequency characteristics such as curves E and F are obtained, even when the antenna 10 for the non-contact type IC card function of the portable terminal device 1 and the antenna coil of the reader / writer approach each other, the portable terminal device Even when the metal member 1 approaches and the impedance frequency characteristic of the antenna coil of the reader / writer changes, it is possible to suppress the occurrence of the communication disabled area.

  As shown in FIG. 4, the inductance of the resonance coils 7 and 8 and the capacitance of the capacitor are set so that the null point disappears from the impedance frequency characteristics of the antenna coil of the reader / writer, that is, the resonance coils 7 and 8 are provided. Sets the resonant frequency of the resonant circuit. The resonance frequency or resonance characteristic of the parasitic resonance circuit depends on the impedance frequency characteristic of the reader / writer, the configuration of the metal member included in the portable terminal device 1, and the characteristics and arrangement of the non-contact IC card function antenna 10. Accordingly, as shown in FIG. 4, it is set to a value at which a null point does not occur. At this time, as shown in FIG. 4, the impedance of the antenna coil of the reader / writer becomes a peak at the carrier frequency while taking into account that the impedance increases at frequencies other than the carrier frequency due to the above-described resonance characteristics. In addition, the arrangement of the resonance coils 7 and 8 and the resonance frequency of the resonance circuit are determined so that the impedance indicating ON and the impedance indicating OFF do not have the same value at the same frequency. The above resonance frequency or resonance characteristic is an impedance that indicates the above-mentioned ON even if the impedance frequency characteristic of the reader / writer antenna coil changes due to various factors at least at the carrier frequency used for communication in the non-contact IC card function. And so that the impedance indicating OFF can be discriminated.

  Note that the resonance coil constituting the resonance circuit may act so as to prevent communication between the portable terminal device 1 and the reader / writer, and therefore, at a sufficient distance from the reader / writer in communication by the non-contact type IC card function. The portable terminal device 1 includes one of the resonance circuit 7 and the resonance coil of the resonance coil 7 and the resonance coil 8 illustrated in FIG. 1 so that data communication can be performed. If the communication distance by the non-contact type IC card function can be sufficiently secured, both the resonance coils 7 and 8 may be provided.

As described above, according to the first embodiment, the resonance circuit for changing the impedance of the antenna coil provided in the reader / writer for the non-contact type IC card is formed in the portable terminal device 1 having the non-contact type IC card function. Since the resonance coils 7 and 8 are provided, there is an effect that it is possible to improve the reliability of the processing operation by the non-contact type IC card function by suppressing the occurrence of the communication impossible area with a simple configuration.
In addition, by suppressing the occurrence of a non-communication area, the non-contact type IC card function can be communicated even when the battery unit 9 including the non-contact type IC card function antenna 10 is not directed to the reader / writer. There is an effect that can be.

Embodiment 2. FIG.
FIG. 5 is an explanatory diagram showing the configuration of the portable terminal device according to the second embodiment of the present invention. This figure is a perspective view showing a schematic appearance of a foldable portable terminal device 20 having a non-contact type IC card function, and an upper housing 21 having an LCD unit 27 (not shown in FIG. 5) and an operation button not shown. The hinge part 20a is rotated and folded so as to overlap the lower casing 22 having a part. The upper casing 21 includes a sub LCD section 23 that exposes the display screen on the casing upper end surface 21a on the back side of the display screen of the LCD section 27 described above. Further, a resonance coil 24 that forms a non-excited resonance circuit (not shown) is disposed / fixed inside the upper housing 21 so as to wind around the sub LCD unit 23. The lower housing 22 has a non-contact type IC card function antenna 25 arranged / fixed on the side of the battery unit 22a on which a battery or the like is mounted, that is, in the vicinity of the bottom surface inside the lower housing 22. The non-contact IC card function antenna 25 is the same as the non-contact IC card function antenna 10 described in the first embodiment. The mobile terminal device 20 includes components used for a call function, an image shooting / display function, an e-mail creation / transmission / reception function, and the like that are not shown and described here.

FIG. 6 is an explanatory diagram showing a schematic configuration of the mobile terminal device according to the second embodiment. The same parts as those shown in FIG. 5 are denoted by the same reference numerals, and the description thereof is omitted. This figure shows the arrangement of the resonance coil 24 and the non-contact type IC card function antenna 25 when the mobile terminal device 20 shown in FIG. 5 is viewed from the side, and is arranged inside each casing. The main part is represented by a broken line.
The foldable portable terminal device 20 is wound, for example, along the outer surface of the battery part 22a of the lower housing 22, that is, the bottom surface of the portable terminal device 20, similarly to the portable terminal device 1 described in the first embodiment. The non-contact type IC card function antenna 25 arranged as described above is provided inside the lower casing 22. The non-contact type IC card function antenna 25 is connected to a circuit that performs a processing operation of a non-contact type IC card function (not shown). In addition, an LCD unit 27 that is connected and fixed to the LCD substrate 26 is provided inside the upper housing 21. The LCD unit 27 is installed so that its display screen faces the lower housing 22 in the figure, that is, when the portable terminal device 20 is opened and opened by rotating the hinge unit 20a, the display screen faces the user side. The LCD substrate 26 is connected and fixed to the back side of the display screen.

  The sub LCD unit 23 is connected and fixed to the back surface of the LCD substrate 26, that is, the back surface of the substrate surface connected and fixed to the LCD unit 27. The resonance coil 24 is wound and fixed, for example, on the substrate surface of the LCD substrate 26 on the side on which the sub LCD unit 23 is fixed, or a coil pattern is formed on the substrate, and the sub LCD unit 23 is formed as described above. It is equipped so that the outer periphery of a display screen may be wound. The configuration of the resonance coil 24 is not limited to that described above. The resonance coil 24 constitutes a resonance circuit as described above. For example, like the resonance coils 7 and 8 described in the first embodiment, the resonance coil 24 is connected in parallel with a capacitor (not shown) and operates without power supply. A non-excited resonance circuit is configured. That is, this resonant circuit is configured to be electrically independent from the circuit used for the non-contact type IC card function and the like, as in the resonant circuit described in the first embodiment. In the same way as described, the null point disappears from the impedance frequency characteristics of the antenna coil of the reader / writer, or the impedance indicating the ON level and the impedance indicating the OFF level in the data communication by the non-contact type IC card function Is set so as to influence the impedance frequency characteristic.

  In general, when the non-contact type IC card function of the foldable portable terminal device 20 is used, the upper casing 21 and the lower casing 22 are used in a state of being overlapped as shown in FIG. When the mobile terminal device 20 is folded in this manner, the resonance coil is located at a position sufficiently away from the non-contact IC card function antenna 25 disposed in the vicinity of the battery unit 22a, for example, in the vicinity of the upper end surface 21a of the housing. 24 is arranged / fixed. Note that the non-contact type IC card function antenna 25 and the resonance coil 24 are arranged at a distance at which no interference occurs as described in the first embodiment.

Next, the operation will be described.
A duplicate description of the same operations and effects as those of the mobile terminal device 1 described in the first embodiment is omitted. When the foldable portable terminal device 20 uses the non-contact IC card function as described above, the processing operation is performed in a state in which the upper housing 21 and the lower housing 22 are overlapped with each other. Communication is performed with the battery unit 22a of the mobile terminal device 20 including the IC card function antenna 25, that is, the bottom surface of the mobile terminal device 20 directed toward the reader / writer. At this time, the communication operation performed with the reader / writer is the same as that described in the first embodiment. By providing the upper casing 21 with the resonance coil 24 as in the mobile terminal device 20, the battery unit 22a of the mobile terminal device 20, that is, the communication surface including the non-contact IC card function antenna 25 is provided as a reader / writer. Even when not directed to the antenna, the resonance coil 24 forming the resonance circuit similarly to the one described in the first embodiment affects the impedance frequency characteristics of the antenna coil of the reader / writer, and the portable terminal device 20 and the reader / writer are not affected. Communication of the non-contact type IC card function is performed while suppressing the occurrence of a non-communication area in the middle, that is, in front of the casing upper surface 21a of the portable terminal device 20 and in the vicinity thereof.

As described above, according to the second embodiment, the reader / writer is provided around the sub LCD unit 23 provided in the upper casing 21 of the foldable portable terminal device 20 and directing the display screen to the outside. Since the resonance coil 24 that changes the impedance frequency characteristic of the antenna coil is provided, it is possible to suppress the occurrence of a non-communication area with a simple configuration, and the reliability of the operation processing by the contactless IC card function of the foldable portable terminal device 20 This has the effect of improving the performance.
Further, by suppressing the occurrence of a non-communication area, communication of the non-contact type IC card function is performed even when the battery unit 22a including the non-contact type IC card function antenna 25 is not directed to the reader / writer. There is an effect that can be.

Embodiment 3 FIG.
FIG. 7 is an explanatory diagram showing the configuration of the mobile terminal device according to Embodiment 3 of the present invention. The same reference numerals are used for the same parts as those shown in FIG. The mobile terminal device 1a shown in FIG. 7 includes a resonance coil 30 in the lower casing 3 of the sliding mobile terminal device 1 described in the first embodiment, and the other parts are the same as those in the first embodiment. The configuration is almost the same as described. Here, the overlapping description of the parts configured in the same manner as the mobile terminal device 1 described in the first embodiment is omitted. Note that the mobile terminal device 1a illustrated here includes the resonance coils 7 and 8 described in the first embodiment and the resonance circuit constituted by the resonance coil in order to secure a communication distance by the non-contact type IC card function. I do not have.

  As described above, the lower housing 3 is wound around the battery unit 9 on which the battery or the like is mounted, that is, around the bottom surface of the lower housing 3 so as to surround the outer periphery of the battery or the like (not shown). The non-contact IC card function antenna 10 is disposed and fixed inside the housing. The lower casing 3 of the mobile terminal device 1a is substantially on the same plane as the above-described non-contact IC card function antenna 10, in other words, inside the lower casing 3 and in the vicinity of the bottom surface of the casing. Is placed / fixed.

  The resonance coil 30 is connected to a capacitor (not shown), for example, so as to operate without power supply, like the resonance coils 7 and 8 described in the first embodiment and the resonance coil 24 described in the second embodiment. In the same manner as the resonance circuit described in the first and second embodiments, it is configured independently from a circuit (not shown) used for the non-contact type IC card function, and is electrically connected. It has not been. The resonance characteristic of this circuit affects the impedance frequency characteristic of the antenna coil of the reader / writer in the same way as the above-described resonance circuits, and the null point disappears from the characteristic, or in data communication by the non-contact type IC card function The impedance frequency characteristic is affected so that the impedance indicating the ON level and the impedance indicating the OFF level can be distinguished. In other words, the resonance circuit is configured to have resonance characteristics that exclude the null point from the above characteristics of the antenna coil of the reader / writer, and the resonance coil 30 is configured / arranged. Furthermore, when the resonance coil 30 is arranged, as described in the first embodiment, the resonance coil 30 is arranged / configured so that data communication with the reader / writer can be performed at a communication distance required as a non-contact type IC card function. In addition, it is not limited to the arrangement | positioning which orient | assigns the said resonance coil 30 so that it may wind in parallel with the bottom face of a housing | casing as illustrated in FIG.

Next, the operation will be described.
The mobile terminal device 1a operates in substantially the same manner as the mobile terminal device 1 described in the first embodiment. Here, redundant description of the operation described in the first embodiment is omitted. The mobile terminal device 1a includes the resonance circuit and the resonance coil 30 that operate as described above, and in front of and around the bottom of the mobile terminal device 1a, that is, between the communication surface of the lower housing 3 and the reader / writer. In this case, the occurrence of a communication impossible area is suppressed.
As described in the first embodiment, the upper casing 2 may be provided with the resonance coils 7 and 8 and the resonance circuit on the assumption that the communication distance with the reader / writer can be ensured.

  In addition, the resonance coil 30 provided along the bottom surface of the housing provided with the antenna for contactless IC card function is not limited to the slide-type mobile terminal device 1a. For example, the foldable mobile phone described in the second embodiment is used. You may arrange | position similarly to the bottom face vicinity with which the antenna for non-contact-type IC card functions, such as the lower side housing | casing 22 of the terminal device 20, is provided.

  As described above, according to the third embodiment, the resonance coil 30 along the bottom surface of the casing together with the non-contact IC card function antenna 10 near the bottom surface of the lower casing 3 of the sliding portable terminal device 1a. Since the impedance frequency characteristic of the antenna coil provided in the reader / writer is affected by arranging / fixing the signal, the communication impossible area in front of the bottom surface of the portable terminal device 1a and in the vicinity thereof with a simple configuration. It is possible to improve the reliability of communication processing by the non-contact type IC card function by suppressing the occurrence of the above.

It is explanatory drawing which shows the external appearance of the portable terminal device by Embodiment 1 of this invention. FIG. 3 is an explanatory diagram illustrating a configuration of a resonance coil that forms a resonance circuit included in the mobile terminal device according to the first embodiment. It is explanatory drawing which shows the communication operation of a non-contact type IC card and a reader / writer. 6 is an explanatory diagram illustrating a communication operation of a non-contact IC card function of the mobile terminal device according to Embodiment 1. FIG. It is explanatory drawing which shows the structure of the portable terminal device by Embodiment 2 of this invention. FIG. 5 is an explanatory diagram showing a schematic configuration of a mobile terminal device according to a second embodiment. It is explanatory drawing which shows the structure of the portable terminal device by Embodiment 3 of this invention.

Explanation of symbols

  1, 1a, 20 Mobile terminal device, 2, 21 Upper casing, 3, 22 Lower casing, 4, 27 LCD section, 5, 6 Operation button section, 6a Push button, 7, 8, 24, 30 Resonant coil , 8a Coil pattern, 8b Capacitor, 9, 22a Battery part, 10, 25 Non-contact IC card function antenna, 11 Key board, 20a Hinge part, 21a Case upper end surface, 23 Sub LCD part, 26 LCD board.

Claims (7)

In a portable terminal device having a non-contact IC card function,
A resonance coil that forms a non-excited resonance circuit that changes the impedance of an antenna coil provided in a reader / writer for a non-contact type IC card is provided at a site away from the antenna for the non-contact type IC card function. Mobile terminal device.   The resonance coil has a resonance characteristic that changes the impedance frequency characteristic of the antenna coil so that the impedance indicating ON and the impedance indicating OFF detected by the antenna coil of the reader / writer are not the same. The mobile terminal device according to 1.   3. The portable terminal device according to claim 1, wherein the resonance coil is connected in parallel with a capacitor to form a resonance circuit independent of a circuit used for a non-contact type IC card function.   2. The portable terminal device according to claim 1, wherein the resonance coil is disposed on a portion of the device casing which is on the back side of the portion where the non-contact IC card function antenna is disposed.   5. The resonance coil is disposed in an upper casing of a sliding portable terminal device that slides an upper casing having a display screen and a lower casing having a non-contact IC card function antenna. The portable terminal device described.   The resonance coil is arranged on the outer surface side of the upper casing of the folding portable terminal device in which the upper casing having the display screen and the lower casing having the non-contact IC card function antenna are folded and overlapped by the hinge portion. The portable terminal device according to claim 4.   2. The portable terminal device according to claim 1, wherein the resonance coil is disposed in the vicinity of a bottom surface of a housing including a non-contact type IC card function antenna.

Images