JP2005348066A - Antenna arrangement structure and communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize antenna arrangement structure and communication terminals for arrangement of antenna with well workability, capable of communicating with a reader/writer device of both weak and strong methods. <P>SOLUTION: In the antenna arrangement structure, an antenna 15 for non-contact communication is arranged in steps at the body lower part 3 of a portable telephone. The communication terminal comprises a body upper part provided with a display screen, and the body lower part 3 provided with a battery housing part 10. The antenna 15 for non-contact communication is arranged in circles at the body lower part 3, with the area surrounded by the antenna 15 being larger than that of maximum surface of the battery housing 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an antenna arrangement structure used for contactless communication and a communication terminal in which an antenna is arranged using the antenna arrangement structure.

  Conventionally, for example, in a ticket gate of a transportation system such as a train or an entrance / exit system of a large-scale office building, a non-contact IC card with a built-in IC is several centimeters to a reader / writer (read / write) device. A non-contact IC card system that can realize data communication between the IC card and the reader / writer device by being held in a state where it is separated by several tens of centimeters is employed.

  The non-contact IC card system is configured such that an antenna mounted on an IC card substrate operates by capturing minute electromagnetic waves from a reader / writer device. Since this non-contact IC card system can perform data communication by simply holding the IC card without contacting the reader / writer device, high-speed processing such as a ticket gate system for transportation, for example, is possible. Suitable for systems that require

  On the other hand, mobile terminals such as mobile phones and PHS are widely used, and the specific gravity of the information terminal is increasing, not limited to simple calling means. Since the non-contact IC card exchanges data by non-contact communication, it is not necessary to insert it into a reading device like a magnetic card or a contact IC card, and can be mounted on a portable terminal and used. For this reason, there is an attempt to adopt a non-contact IC card in a mobile phone. For example, Patent Documents 1 and 2 disclose a technique for mounting this non-contact IC card on a mobile phone.

  Patent Document 1 describes a wireless communication module that is incorporated inside a battery lid of a mobile device and configured integrally with the mobile device. This wireless communication module includes an antenna coil that transmits and receives signals to and from an external reader / writer device, and an IC chip that is connected to the antenna coil and exhibits a contactless IC card function. In the wireless communication module described in Patent Document 1, an antenna coil and an IC chip are mounted or built in a battery lid.

  In Patent Document 2, a non-contact IC card functional component including an antenna having a metal conductor wired in a coil shape and an IC component electrically connected thereto is incorporated and sealed in at least a part of a housing made of resin. A mobile phone casing is described. In the cellular phone casing described in Patent Document 2, an antenna coil and a non-contact IC card functional component are embedded and sealed in the resin of the battery unit cover.

  It should be noted that the antenna characteristics of the antenna mounted on the non-contact IC card deteriorate if a metal part constituting a liquid crystal display device, an ear receiver, or the like built in the cellular phone is nearby. In this case, in order to improve the communication state between the mobile phone and the reader / writer device, it is necessary to dispose the antenna as far as possible from the metal part. However, if the distance between the antenna and the reader / writer device is sufficiently secured, the thickness of the mobile phone itself increases and the size increases.

In consideration of this point, Patent Document 3 discloses a portable communication terminal in which an antenna is mounted without being affected by metal parts, the communication distance of the antenna is sufficiently secured, and the thickness is reduced. . In the mobile communication terminal described in Patent Document 3, a non-contact IC card and an antenna are provided independently, and the antenna is arranged in a ring shape along the vicinity of the outer periphery of the terminal body, or the antenna is a mold. Embedded in the part.
JP 2003-67692 A (published March 7, 2003) JP 2003-37861 A (published February 7, 2003) JP 2003-258972 A (published on September 12, 2003)

  However, as in Patent Documents 1 to 3, when the antenna coil or IC chip is built in the strong body of the terminal, it is necessary to mold the casing while incorporating the antenna coil or IC chip, and the workability is very high. In addition to being bad, it has the problem of complicated manufacturing.

  In addition, as in Patent Documents 1 and 2, when an antenna coil or IC chip is attached to a removable part such as a battery lid, the antenna coil or IC chip is damaged by removing them. There is a risk. In other words, there is a possibility that the user will be damaged by normal use.

  Furthermore, in recent years, the size of the battery tends to become smaller and the lid for the battery is also getting smaller. For this reason, when the antenna coil is attached to the battery lid, the area surrounded by the antenna coil cannot be sufficiently secured. In general, the larger the area surrounded by the antenna coil, the higher the accuracy of communication, and the smaller the battery cover, the more difficult it is to perform high-accuracy communication. Have.

  Note that non-contact communication is performed by communication between the antenna and the reading / writing device. This communication is performed when the antenna is brought close to the reading / writing device and a predetermined electric field strength is reached. In general, the read / write device includes a strong electric type having a communicable distance of about 10 cm and a weak type having a communicable distance of about 2 cm.

  In the configuration of Patent Document 3, communication with a high-power type reading / writing device is possible, but communication with a weak type reading / writing device is difficult due to the influence of an obstacle such as metal. That is, there is a problem that communication cannot be performed with both the high-power type and the weak type reading / writing devices.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to be able to arrange an antenna with good workability and to communicate with both weak type and high power type reading / writing devices. The object is to realize an antenna arrangement structure and a communication terminal.

  In order to solve the above problems, an antenna arrangement structure according to the present invention is an antenna arrangement structure in which an antenna that performs non-contact communication with a reading / writing device is arranged in a communication terminal. It is characterized by being arranged in steps so as to have a step in the direction with respect to the apparatus.

  In general, when performing non-contact communication, the communication distance between the antenna and the reading / writing device varies depending on whether the reading / writing device is a high-power type or a weak type. In the case of a high-power type reading / writing device, the communication distance is long, and in the case of a weak type reading / writing device, the communication distance is short. When a weak type read / write device is used, since the communication distance is short, a sufficient communication distance cannot be ensured depending on the arrangement position of the antenna, and sensitivity may be insufficient, and good communication may not be performed.

  On the other hand, according to the above configuration, since the antenna is arranged in a stepped manner so as to have a step in the direction with respect to the reading / writing device, the antenna is connected to the reading / writing device in a stepped high portion. The distance is long and the distance to the reading / writing device is short in the lower part. That is, the antenna has a portion with a different distance from the reading / writing device. For this reason, even if the antenna of the stepped high part becomes insufficient in sensitivity, it becomes possible to perform good communication with the antenna of the low part.

  Thereby, it is possible to obtain an antenna arrangement structure in which communication with both high-power type and weak type reading / writing devices can be performed with one antenna.

  In the antenna arrangement structure according to the present invention, the antenna is preferably arranged in an annular shape. By arranging the antenna in a ring shape, the area of the portion surrounded by the antenna can be increased. As the area of the portion surrounded by the antenna is larger, the communication characteristics can be improved, so that an antenna arrangement structure capable of better communication can be obtained.

  In order to solve the above problems, a communication terminal according to the present invention includes a first casing provided with a display unit and a second casing provided with a battery storage unit, and is not in contact with the second casing. A communication terminal having an antenna for wireless communication, wherein the antenna is arranged in an annular shape, and an area surrounded by the antenna is larger than an area of a maximum surface of the battery storage unit. It is a feature.

  According to said structure, since the antenna is arrange | positioned cyclically | annularly, the area of the part enclosed by the antenna can be enlarged. The larger the area surrounded by the antenna, the better the communication characteristics. In the strong electric type having a long communication distance, the merit of improving the communication characteristics by the size of the area surrounded by the antenna is larger than the deterioration of the communication characteristics due to the influence of the battery. For this reason, it is possible to perform good communication without being affected by the battery.

  When performing non-contact communication, the communication distance between the antenna and the reading / writing device varies depending on whether the reading / writing device is a high-power type or a weak type. When a weak type with a short communication distance is used, if a battery exists between the antenna and the reading / writing device, the communication characteristics deteriorate due to the influence of the battery.

  However, according to the above configuration, since the area surrounded by the annular antenna is larger than the area of the maximum surface of the battery housing portion, the outermost peripheral portion of the antenna is connected to the reading / writing device. No battery is present. Therefore, it is possible to perform good communication even when a weak type reading / writing device is used.

  Therefore, with the above configuration, even when antennas are arranged in the second housing having the battery housing portion, one antenna can be used without increasing the number of antennas or using special parts. Thus, a communication terminal capable of communicating with both high-power type and weak-type reading / writing devices can be provided.

  In the communication terminal according to the present invention, the inner surface side of the second casing includes an upper stage portion that is a portion provided with the battery storage portion, a lower step portion that is a portion where the battery storage portion is not provided, an upper step portion, and a lower step. It is preferable that the antenna has a stepped structure including a step portion that is a portion connecting the portions, and the antenna is disposed across the upper step portion, the step portion, and the lower step portion of the second casing.

  According to said structure, the 2nd housing | casing of a communication terminal has the step-shaped structure in the inner surface side. In addition, the antenna is disposed over the upper, step, and lower steps of the step structure. That is, the antenna itself has a stepped structure. There is no battery between the antenna of the lower part and the reading / writing device, and the antenna arranged at the lower part of the antenna is arranged before the battery when performing communication. To approach. For this reason, the battery is not affected. Therefore, even in the case of a weak type read / write device, it is possible to perform better communication.

  In the communication terminal according to the present invention, it is preferable that at least a part of the antenna is disposed on a peripheral portion of the inner surface of the second housing. If the antenna is arranged so that at least a part thereof is located at the peripheral edge portion of the inner surface of the second housing, the area of the antenna portion can be further increased. In particular, when the antenna is arranged in a ring shape, the area surrounded by the antenna can be increased. Therefore, it is possible to obtain a communication terminal that can perform better communication.

  In the communication terminal according to the present invention, the antenna is preferably attached to the second housing. Since the antenna can be disposed by simply attaching the antenna to the second housing, the antenna can be easily disposed on the second housing with good workability.

  As described above, the antenna arrangement structure according to the present invention is an antenna arrangement structure in which an antenna that performs non-contact communication with a reading / writing device is arranged in a communication terminal, and the antenna is oriented with respect to the reading / writing device. Are arranged in steps so as to have a step. Further, as described above, the communication terminal according to the present invention includes the first casing provided with the display unit and the second casing provided with the battery storage unit, and the second casing is contactless. A communication terminal in which an antenna for communication is arranged, wherein the antenna is arranged in an annular shape, and an area surrounded by the antenna is larger than an area of a maximum surface of the battery storage unit. . For this reason, there is an effect that communication with both high-power type and weak type reading / writing devices can be performed with one antenna.

  An embodiment of the present invention will be described with reference to FIGS. 1 to 8 as follows. In this embodiment, a foldable mobile phone (hereinafter abbreviated as a mobile phone) will be described as an example of the communication terminal of the present invention.

  2 and 3 are plan views showing a schematic configuration of the mobile phone (communication terminal) 1 according to the present embodiment. 2 and 3 show a state in which the mobile phone 1 is opened. FIG. 2 is a view from the front, and FIG. 3 is a view from the back.

  As shown in FIGS. 2 and 3, the mobile phone 1 is composed of a main body upper part (first housing) 2 and a lower body lower part (second housing) 3. It can be opened and closed via. The main body upper part 2 includes a display screen 5 and a speaker 6 on the front side, and includes a back side display screen 7 and the like on the back side. A liquid crystal display device is used for the display screen 5 and the rear display screen 7. Further, the main body lower part 3 includes an operation button 8 and a microphone 9 on the front side, and a battery storage unit 10 on the back side. The battery storage part 10 is a part which stores a battery inside, and is covered with a cover.

  FIG. 4 is a perspective view showing a schematic configuration of the lower body 3 viewed from the outside in a state where no battery is stored in the battery storage unit 10 and a cover is removed. 1 is a perspective view showing a schematic configuration of the main body lower portion 3 as viewed from the inside, and FIG. 5 is a cross-sectional view showing a schematic configuration of the main body lower portion 3 in a state where the battery 11 is stored in the battery storage portion 10.

  As shown in FIG. 4, the battery storage unit 10 has a structure in which a part for storing the battery 11 is recessed inside the housing, and the battery 11 is stored in this recess. For this reason, as shown in FIGS. 1 and 5, the main body lower portion 3 has a structure in which a portion of the battery housing portion 10 protrudes when viewed from the inside of the housing. That is, the main body lower part 3 has a stepped structure in which the inner surface side has two steps.

  As shown in FIG. 1 and FIG. 5, the specific structure on the inner surface side of the main body lower part 3 includes a portion that protrudes inside the housing (the portion where the battery storage unit 10 is provided) and a portion that does not protrude inside the housing ( A portion having no battery housing portion) and an inclined portion connecting these portions. In the present embodiment, for the sake of convenience of explanation, in this stepped structure, a portion protruding into the housing is the upper step portion 12, a portion not protruding into the housing is the lower step portion 13, and the upper step portion 12 and the lower step portion 13. An inclined portion between the two is called a stepped portion 14.

  As shown in FIGS. 1 and 5, in the mobile phone 1, an antenna 15 is disposed (mounted) from an upper step 12 to a step 14 and a lower step 13 of the lower body 3. That is, the antenna 15 is arranged in a step shape having a step in the direction with respect to the reader / writer device, and has a step structure corresponding to the step structure of the lower body 3. In the present embodiment, the antenna 15 is affixed to the housing of the lower main body 3. Data can be exchanged by wireless communication by holding the antenna 15 over a reader / writer device (reading / writing device) (not shown).

  FIG. 6 is a plan view showing a schematic configuration of the antenna 15 in the present embodiment, and a side view showing a state of being attached to the lower part 3 of the main body. The antenna 15 is made of a flexible substrate having a copper foil pattern formed in an annular shape (loop shape) of several turns, and is affixed on the inner surface of the lower portion 3 of the main body. The flexible substrate is made of a material containing a polyimide resin, and copper foil is formed on both surfaces thereof. The communication characteristics of the antenna 15 improve as the area surrounded by the copper foil pattern formed in the loop shape increases. For this reason, in this Embodiment, the antenna 15 is affixed on the peripheral part of main body lower part 3 housing | casing inner surface. This makes it possible to obtain good communication characteristics.

  When forming the antenna 15, the thickness of the copper foil pattern and the interval between the copper foil patterns can be appropriately changed so that good communication characteristics can be obtained. For example, when the interval between the copper foil patterns is narrowed, the area surrounded by the antenna 15 can be increased.

  Further, the interval between the copper foil patterns is widened, and the copper foil patterns of several turns are arranged on the upper 12 parts, the lower stage 13 and the like, and the remaining copper foil patterns are arranged on the standing surface on the inner surface of the lower part 3 of the main body. It may be affixed to. In this case, the area surrounded by the antenna 15 can be further increased. Thus, the affixing position of the antenna 15 suffices if at least a part of the antenna 15 is arranged from the upper step portion 12 to the step portion 14 and the lower step portion 13 and can be changed as appropriate in consideration of communication characteristics.

  In the present embodiment, the antenna 15 is affixed using a double-sided tape containing a magnetic material. If there is a metal near the antenna 15, interference occurs due to the influence of the metal and communication characteristics deteriorate, but this interference can be reduced by providing a magnetic material between the antenna 15 and the metal. It becomes. Since the battery 11 used in the cellular phone 1 has many metal parts, the communication characteristic of the antenna 15 disposed in the upper stage 12 may be deteriorated. However, the communication characteristic is deteriorated by providing a magnetic material. Is suppressed. That is, the double-sided tape containing a magnetic material is not only for sticking the antenna 15 but also for suppressing deterioration of communication characteristics.

  Although the said double-sided tape should just contain a magnetic body, it is preferable that the seal | sticker which consists of a magnetic body is used. Any magnetic material that can suppress interference can be used. For example, ferrite can be used.

  Further, as shown in FIGS. 4 and 5, the outer shape of the battery housing portion 11 is smaller than the outer shape of the lower portion 3 of the main body. For this reason, when the antenna 15 is affixed to the peripheral portion of the inner surface of the lower body 3 of the main body, the area surrounded by the antenna 15 is larger than the area of the maximum surface of the battery storage unit (the area of the maximum surface of the battery 11). Can be bigger. That is, the antenna 15 can be arranged so as to be larger than the outline of the battery 11 (a loop larger than the battery 11). In this case, even in the antenna 15 arranged in the upper stage 12, a portion where no metal exists between the reader / writer device can be provided, so that it is possible to further suppress deterioration in communication characteristics.

  The antenna 15 is connected to a non-contact IC chip (not shown) which is a non-contact communication IC. For this reason, the antenna 15 is provided with a contact 16 for connecting the antenna 15 and the non-contact IC chip. This contact 16 consists of a part of copper foil pattern which comprises the antenna 15, and specifically consists of each edge part of the copper foil pattern formed in loop shape. Since the loop-shaped antenna 15 has a copper foil formed in a so-called spiral shape, one of the contacts is electrically connected to the antenna 15 via the copper foil formed on the back surface of the flexible substrate. Specifically, the copper foil patterns on both sides are electrically connected to the points A and B shown in FIG. 6 through the copper through holes.

  Note that a printed circuit board (not shown) on which electronic components for controlling the operation buttons 8, the microphone 9, and the like are mounted is disposed in the lower body 3. An upper non-contact IC chip is also disposed on the printed board. For this reason, a spring contact (not shown) is provided on the printed circuit board so as to contact the contact 16 of the antenna 15. The antenna 15 and the non-contact IC chip are electrically connected by the contact 16 and the spring contact of the printed circuit board coming into contact with each other.

  Although the contact 16 is provided in the vicinity of the center line in the longitudinal direction of the housing in this embodiment, it may be provided at a position where the antenna 15 and the non-contact IC chip can be connected. For example, you may provide in the side surface side of a housing | casing rather than the said centerline vicinity, and you may provide in a corner | angular part.

  When the cellular phone 1 is exposed to a high temperature state for a certain period of time, the casing expands. In general, the degree of expansion is greatest near the center line. For this reason, when the contact 16 is provided in the vicinity of the center line, the distance from the printed circuit board increases due to expansion of the housing, and the contact state between the contact 16 and the spring contact may be poor. In the case where the contact 16 is provided on the side surface side or corner of the housing relative to the center line, it is possible to prevent the distance from the printed circuit board from being separated even when the housing is expanded. For this reason, it becomes possible to maintain a favorable contact state by providing the contact 16 on the side surface side of the housing.

  The stepped portion 14 preferably has a certain slope. This is because it is difficult to attach the antenna 15 when the boundary between the upper step portion 12 and the lower step portion 13 has a steep slope. Although the inclination angle is not particularly limited, it is preferable that the inclination is such that the antenna 15 can be easily attached and does not hinder the arrangement of other electronic components.

  Next, a mechanism for performing non-contact communication between the mobile phone 1 on which the antenna 15 is disposed (mounted) and the reader / writer device will be described.

  Communication between the mobile phone 1 and the reader / writer device is performed by bringing the antenna 15 of the mobile phone 1 closer to the reader / writer device. Specifically, communication is performed when the antenna 15 approaches the reader / writer device and reaches a predetermined electric field strength. Note that the reader / writer device includes a strong electric type having a communicable distance of about 10 cm and a weak type having a communicable distance of about 2 cm (the high electric type can communicate from about 0 to 10 cm, and the weak type is about 0). Communication is possible up to 2 cm). For this reason, when the reader / writer device is a weak type, if the antenna 15 is disposed (mounted) in the back (inside) of the housing, the communication distance becomes short, and a metal is formed between the antenna 15 and the housing. If there is an obstacle such as, the communication distance is further shortened. Therefore, it is preferable to mount the antenna 15 on the outer side of the inner surface of the housing that increases the communication distance.

  FIG. 7 is a diagram showing a state in which communication is performed between the antenna 15 and the reader / writer device 17 when the high-power type reader / writer device 17 is used. As shown in FIG. 7, in the case of a high-power type reader / writer device 17, the antenna 15 is brought closer to the reader / writer device 17, and communication is performed when these distances are about 10 cm.

  As described above, the communication characteristics may be deteriorated due to the influence of the battery 11 existing between the antenna 15 and the reader / writer device 17. On the other hand, the antenna 15 in the present embodiment has improved communication characteristics by increasing the area surrounded by the antenna 15. When the distance between the antenna 15 and the reader / writer device 17 is about 10 cm, the merit of improving the communication characteristics due to the larger area surrounded by the antenna 15 than the deterioration of the communication characteristics due to metal interference Is bigger. Therefore, when the high-power type reader / writer device 17 is used, good communication is possible due to the effect of the antenna 15 arranged in the upper stage 12.

  On the other hand, FIG. 8 shows a state where communication is performed between the antenna 15 and the reader / writer device 18 when the weak reader / writer device 18 is used. As shown in FIG. 8, in the case of the weak type reader / writer device 18, the antenna 15 is brought closer to the reader / writer device 18, and communication is performed when these distances are about 2 cm.

  Unlike the case of the high-power type reader / writer device 17, when the distance between the antenna 15 and the reader / writer 18 device is about 2 cm, these distances are close and affected by metal. For this reason, even when the area surrounded by the antenna 15 is large, it is difficult to perform communication with high sensitivity.

  However, in the present embodiment, the antenna 15 is also arranged in the lower step portion 13 of the main body lower portion 3. There is no metal (battery 11) between the antenna 15 arranged in the lower stage 15 and the reader / writer device 18, and the antenna 15 arranged in the lower stage 13 is less affected by metal. Further, as shown in FIG. 5, the antenna 15 is directly attached to the lower body 3 housing, whereas the battery 11 housed in the battery housing 10 is slightly inside the body lower 3 housing. Has been placed. For this reason, the antenna 15 affixed to the lower stage part 13 will be arrange | positioned outside the battery 11 accommodated in the battery accommodating part 10 (outer peripheral side of a housing | casing). That is, when the antenna 15 is brought closer to the reader / writer device 18, the antenna 15 gets closer to the reader / writer device 18 than the battery 11. Also by this, the influence received from the metal of the antenna 15 arrange | positioned at the lower stage part 13 becomes small.

  That is, when the weak reader / writer device 18 is used, the effect of the portion not affected by the metal (battery) is greater than the merit of the area surrounded by the antenna 15, and the lower step portion Good communication is possible due to the effect of the antenna 15 arranged at 13. Accordingly, communication with the weak reader / writer device 18 is possible even when the battery 11 is stored.

  Thus, in order to perform good communication by non-contact communication, when the reader / writer device is a high-power type, the size of the area surrounded by the antenna 15 becomes an important factor, and the weak type In some cases, the presence or absence of metal influence is an important factor.

  In the present invention, with the antenna arrangement structure described above, it is possible to arrange an antenna having two distances from the reader / writer device even though it is a single antenna. In addition, the antenna according to the present invention has an area that allows sufficient communication, and also has a portion that is not affected by metal. For this reason, even when antennas are arranged in the lower part of the main body having the battery storage part, both the strong electric type and the weak type are used with one antenna without increasing the number of antennas or using special parts. It is possible to communicate with the reader / writer device.

  In the above description, the foldable mobile phone has been described. However, the present invention is not a foldable mobile phone, or a foldable mobile phone in which the upper part of the main body is pivotally connected to the lower part of the main body. Even applicable.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately changed within the scope of the claims are also included in the technical scope of the present invention.

  As described above, in the communication terminal according to the present invention, the antenna is arranged from the upper step portion of the lower part of the main body to the step portion and the lower step portion. For this reason, it is a communication terminal capable of communicating with both a weak type of about 2 cm and a strong type of about 10 cm with a single antenna, although an antenna is arranged in the battery housing part. Can do. Therefore, not only various industrial fields related to communication terminals, but also industrial fields that manufacture and use various parts used for non-contact communication such as non-contact communication antennas and non-contact ICs and reader / writers equipped with the antenna. Can be suitably used.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, showing an embodiment of the present invention, is a perspective view showing a schematic configuration of a lower part of a main body of a mobile phone. 1, showing an embodiment of the present invention, is a plan view showing a schematic configuration of a mobile phone. FIG. 1, showing an embodiment of the present invention, is a plan view showing a schematic configuration of a mobile phone. FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, showing an embodiment of the present invention, is a perspective view showing a schematic configuration of a lower part of a main body of a mobile phone. 1, showing an embodiment of the present invention, is a cross-sectional view showing a schematic configuration of a lower part of a main body of a mobile phone. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention, and is a plan view and a side view illustrating a schematic configuration of an antenna. FIG. 1, showing an embodiment of the present invention, is a diagram illustrating a state in which communication is performed between an antenna and a reader / writer device. FIG. 1, showing an embodiment of the present invention, is a diagram illustrating a state in which communication is performed between an antenna and a reader / writer device.

Explanation of symbols

1 Mobile phone (communication terminal)
2 Upper part of the body (first housing)
3 Lower part of main body (second housing)
5 Display screen (display section)
DESCRIPTION OF SYMBOLS 10 Battery storage part 11 Battery 12 Upper stage part 13 Lower stage part 14 Step part 15 Antenna 17 Reader / writer apparatus (reading / writing apparatus)
18 Reader / writer device (read / write device)

Claims (6)

An antenna arrangement structure in which an antenna that performs contactless communication with a reading / writing device is arranged in a communication terminal,
The antenna arrangement structure according to claim 1, wherein the antenna is arranged in a step shape so as to have a step in a direction with respect to the reading / writing device.   The antenna arrangement structure according to claim 1, wherein the antenna is arranged in a ring shape. A communication terminal including a first casing provided with a display unit and a second casing provided with a battery storage unit, wherein an antenna for non-contact communication is arranged in the second casing,
The antenna is arranged in an annular shape,
The communication terminal characterized in that an area surrounded by the antenna is larger than an area of a maximum surface of the battery storage unit. The inner surface side of the second casing is an upper step portion where the battery storage portion is provided, a lower step portion where the battery storage portion is not provided, and a step which is a portion connecting the upper step portion and the lower step portion. Has a stepped structure consisting of
4. The communication terminal according to claim 3, wherein the antenna is arranged over an upper stage part, a step part, and a lower stage part of the second casing.   5. The communication terminal according to claim 3, wherein at least a part of the antenna is disposed on a peripheral portion of the inner surface of the second housing.   The communication terminal according to claim 3, wherein the antenna is attached to the second housing.

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