KR101234301B1 - Communication terminal - Google Patents

Abstract

The communication terminal apparatus which can communicate with a communication partner in a wide angle range is suppressed by suppressing deterioration of communication performance, regardless of the positional relationship (especially an angle relationship) with a communication partner.
On the inner layer of the circuit board 20, a ground conductor as a flat conductor is provided. In addition to the power supply circuit connected to the antenna coil 21, various electronic components for constituting a mobile communication terminal are mounted on the front and rear surfaces of the circuit board 20. The antenna coil 21 is mounted in a state in which the first main surface MS1 of the magnetic core 8 faces the circuit board 20. The antenna coil 21 is arranged so that the first conductor portion 11 of the coil conductor 9 is closer to the ground conductor GND than the second conductor portion 12. In addition, the antenna coil 21 is formed by the first conductor portion 11 of the coil conductor 9 of the longitudinal end of the housing 200 (the portion that becomes the upper end in a state in which the communication terminal device is vertically held). It is arrange | positioned so that it may be located in the vicinity.

Description

Communication terminal device {COMMUNICATION TERMINAL}

The present invention relates to a communication terminal device that can be used in an RFID (Radio Frequency Identification) system for communicating with an external device through an electromagnetic field signal.

In recent years, RFID systems using an HF band such as 13.56 MHz have been increasingly used as FeliCa (Pelika: Trademark) or NFC (Near Field Communication). For example, Patent Document 1 discloses an antenna device for an RFID system.

1 is a cross-sectional view of an antenna device portion of the communication terminal device 90 shown in Patent Document 1. As shown in FIG. The antenna device is provided with an asymmetrical coil having different winding intervals at two positions facing each other along the center of the winding region of the coil 71, and at the side 71a having a large winding interval. The magnetic body 72 is disposed on the side opposite to the surface of the input unit 94 facing the IC card 1, and on the side 71b of the small winding interval, the magnetic body ( 72). The reader / writer circuit 50 is connected to the coil 71. The antenna device is disposed in the antenna housing recess 97a formed in the metal housing 97 and protected by the resin member 98. The magnetic field distribution by this antenna device becomes asymmetrical emphasized on the side 71a at which the winding interval and line width of the coil 71 are widened. Therefore, a good communication state can be ensured in the direction perpendicular to the main surface of the antenna device.

Japanese Patent Publication No. 3755918

When the communication terminal device is placed on a communication partner such as a reader / writer, the angle formed between the communication terminal device side antenna and the counterpart antenna is not necessarily constant. Depending on the positional relationship (angle relationship), stable communication is impossible or communication is impossible. There is a concern. This tendency is particularly remarkable in RFID systems in which communication terminal devices communicate with each other, rather than RFID systems in which communication is performed between a communication terminal device (reader writer) and an IC card (IC tag).

In the communication terminal device of Patent Document 1, as shown in FIG. 1, since the antenna device is disposed in the antenna accommodating recess 97a formed in the metal housing 97, the magnetic flux is received from a direction perpendicular to the main surface of the antenna device. In this case, a good communication state can be secured. However, when the angle between the reader / writer antenna and the terminal antenna becomes large, and further, the distance between the antennas becomes large, it is difficult to secure sufficient communication characteristics.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described situation, and its object is not dependent on the positional relationship (particularly the angular relationship) with the communication partner, and the deterioration of the communication performance can be suppressed and communication with the communication partner can be performed in a wide angle range. It is to provide a communication terminal device.

The communication terminal device of the first aspect of the present application,

A communication terminal apparatus having an antenna core including a magnetic core having a first main surface and a second main surface, and a coil conductor wound around the magnetic core, and a housing for housing or holding the antenna coil,

The coil conductor is located in the first conductor portion located on the first main surface side of the magnetic core and on the second main surface side of the magnetic core and is planar in the first main surface direction or the second main surface direction. Has a second conductor portion disposed at a position different from the first conductor portion,

The said antenna coil is arrange | positioned so that the said 2nd main surface side of the said magnetic body core may face the outer surface side (communication partner side) of the said housing.

In the communication terminal device of the second aspect of the present application, the second conductor portion of the coil conductor is closer to the magnetic core than the length A of the portion where the first conductor portion of the coil conductor is close to the magnetic core. It is characterized by being comprised so that length B of the part to become may become large.

In the communication terminal device according to the third aspect of the present application, in the magnetic core and the coil conductor, the length A of the portion where the first conductor portion of the coil conductor is close to the magnetic core is equal to that of the first conductor portion. It is comprised so that it may become smaller than width C. It is characterized by the above-mentioned.

The communication terminal device according to the fourth aspect of the present application is characterized in that the antenna coil is arranged such that the first conductor portion of the coil conductor is positioned near an end portion in the longitudinal direction of the housing.

The communication terminal device of the fifth aspect of the present application is characterized in that a circuit board having a planar conductor is provided in the housing, and the antenna coil is disposed to face the planar conductor.

The communication terminal device of the sixth aspect of the present application is characterized in that the magnetic core is a hybrid of magnetic powder and a resin material or a sintered magnetic body divided into a plurality of pieces molded into a sheet shape.

The communication terminal device of the seventh aspect of the present application is characterized in that the width of one end of the magnetic core is larger than the width of the other part.

In particular, in the communication terminal apparatus of the present invention, the coil conductors constituting the antenna coil have a planar view in the principal plane direction, located on the first conductor portion located on the first principal plane side of the magnetic core and on the second principal plane side of the magnetic core. Has a second conductor portion disposed at a different position from the first conductor portion, and the antenna coil has the first main surface side of the magnetic core being the planar conductor side, and the first conductor portion of the coil conductor is located near the upper end of the housing. Since it is arrange | positioned so that it may be located, when carrying out wireless communication with a communication partner with the longitudinal end part of a housing facing a communication partner, it does not depend on the positional relationship (especially an angular relationship) with a communication partner, Communication is possible.

1 is a cross-sectional view of an antenna device portion of a communication terminal device shown in Patent Document 1. FIG.
Fig. 2 is a diagram showing an antenna coil included in the communication terminal device according to the first embodiment. 2A is a plan view of the antenna coil, and FIG. 2B is a front view.
3 is a plan view in a state in which the flexible base material 10 on which the coil conductor 9 is formed and the magnetic core 8 are separated.
4 is a diagram illustrating a configuration of a communication terminal device according to the first embodiment and an antenna device included therein. 4A is a plan view of the antenna device 101, FIG. 4B is a front view thereof, and FIG. 4C is a schematic sectional view of the communication terminal device 201.
FIG. 5 is a diagram schematically showing a state of the magnetic flux passing through the antenna coil when the angle θ shown in FIG. 4C is changed. FIG. 5 (A) shows a case where θ = 90 ° and FIG. 5 (B) shows a case where θ = 0 °.
FIG. 6 is a diagram schematically showing a state of the magnetic flux passing through the antenna coil when the angle θ shown in FIG. 4C is changed. FIG. 6 (A) is a case where θ = 0 °, and FIG. 6 (B) is a perspective view schematically showing the state of magnetic flux when θ = 0 °.
Fig. 7 is a diagram showing a state where communication terminal devices communicate with each other, Fig. 7 (A) is a perspective view of a state where communication terminal devices communicate with each other, and Fig. 7 (B) is a cross-sectional view thereof.
Fig. 8 is a diagram showing another state in which communication terminal devices communicate with each other, Fig. 8 (A) is a perspective view of a state where communication terminal devices communicate with each other, and Fig. 8 (B) is a cross-sectional view thereof.
9 is a diagram illustrating a configuration of an antenna coil according to the second embodiment. Fig. 9A is a plan view of the flexible base material 10 in a state where the coil conductor 9 is formed, and Fig. 9B is a view showing the shape of the upper coil conductor portion 9S of the coil conductor 9; 9 (C) is a view showing the shape of the lower coil conductor portion 9U of the coil conductor 9, and FIG. 9 (D) shows a state where the lower coil conductor portion 9U and the upper coil conductor portion 9S overlap. It is a figure which shows.
FIG. 10 (A) is a plan view of the antenna coil 22, and FIG. 10 (B) is a front view of the antenna device including the antenna coil 22. FIG.
Fig. 11A is a sectional view of an essential part of the communication terminal device according to the third embodiment, and Fig. 11B is a front view of the antenna coil according to the third embodiment.
12A is a plan view of the antenna coil 24 according to the fourth embodiment, and FIG. 12B is a front view of the antenna coil 24 according to the fourth embodiment.
FIG. 13A is a plan view of the magnetic core 8 provided in the antenna coil according to the fifth embodiment, and FIG. 13B is a plan view of the antenna coil 25 according to the fifth embodiment.
14A is a plan view of the magnetic core 8 provided in the antenna coil according to the sixth embodiment, and FIG. 14B is a plan view of the antenna coil 26 according to the sixth embodiment.
15 is a sectional view of an essential part of a communication terminal device according to a seventh embodiment.
Fig. 16A is a perspective view of a communication terminal device 208 according to the eighth embodiment, and Fig. 16B is a sectional view thereof.
Fig. 17A is a perspective view of a communication terminal device 209 according to the ninth embodiment, and Fig. 17B is a sectional view thereof.
18 is a sectional view of an essential part of a communication terminal device according to a tenth embodiment.
FIG. 19 is a diagram showing a change in the coupling coefficient with the reader / writer antenna when the positional relationship between the magnetic core 8 and the coil conductor is changed.
20 is a front view of an antenna coil provided in the communication terminal device according to the eleventh embodiment.
21 (A), 21 (B) and 21 (C) are front views of the antenna coil for comparison and comparison.

≪ First Embodiment >

The communication terminal apparatus according to the first embodiment is used as a mobile communication terminal such as, for example, a mobile telephone terminal. 2 is a diagram illustrating an antenna coil included in the communication terminal device. The antenna coil 21 is used as an antenna for an RFID system of the HF band, such as 13.56 MHz. 2A is a plan view of the antenna coil, and FIG. 2B is a front view. The antenna coil 21 includes a magnetic core 8 having a first main surface MS1 and a second main surface MS2, and a coil conductor 9 wound around the magnetic core 8. The coil conductor 9 is positioned on the first conductor portion 11 located on the first main surface MS1 side of the magnetic core 8 and on the second main surface MS2 side of the magnetic core 8. It has the 2nd conductor part 12 arrange | positioned at the position (non-overlapping position) different from the 1st conductor part 11 when it is planarly viewed in MS1) direction.

As shown in FIG. 2 (A), the magnetic core 8 is formed by forming a hybrid plate of ferrite powder and a resin material into a rectangular plate shape. In the coil conductor 9, metal thin films, such as copper, silver, and aluminum, are pattern-formed in rectangular vortex on the surface of the flexible base material 10, such as PET. The terminal electrode 91 is formed at one end of this coil conductor 9, and the terminal electrode 92 is formed at the other end. These terminal electrodes 91 and 92 are connected to a power feeding circuit (not shown).

3 is a plan view in a state in which the flexible base material 10 on which the coil conductor 9 is formed and the magnetic core 8 are separated. As shown in this FIG. 3, the rectangular base opening AP is provided in the flexible base material 10 in the position corresponded to the winding center part of the coil conductor 9. As shown in FIG. The magnetic core 8 is inserted into this opening AP. Therefore, the coil conductor 9 has a first conductor portion 11 located on the first main surface MS1 side of the magnetic core 8, and a second conductor located on the second main surface MS2 side of the magnetic core 8. Each part 12 is provided. The antenna coil 21 is formed of these magnetic cores 8 and coil conductors 9.

4 is a diagram illustrating a configuration of a communication terminal device according to the first embodiment and an antenna device included therein. 4A is a plan view of the antenna device 101, and FIG. 4B is a front view thereof. 4C is a schematic cross-sectional view of the communication terminal device 201.

As shown in Fig. 4A, the circuit board 20 is made of a thermosetting resin such as an epoxy resin, and a ground conductor GND as a flat plate conductor is provided on the inner layer thereof. Although not shown, various electronic components for constituting a mobile communication terminal are mounted on the front and rear surfaces of the circuit board 20 in addition to the power supply circuit connected to the antenna coil 21.

As shown in FIG. 4A, the antenna coil 21 is in a state in which the first main surface MS1 of the magnetic core 8 faces the circuit board 20, through the bonding material on the circuit board 20. It is mounted. Therefore, the first main surface MS1 of the magnetic core 8 faces the ground conductor GND. That is, the antenna coil 21 is arrange | positioned so that it may overlap with the ground conductor GND in the state planarly viewed in the 1st main surface MS1 or 2nd main surface MS2 direction of the magnetic core 8. However, the coil conductor 9 and the ground conductor GND are spaced apart by the interval G. Thus, by using the circuit board 20 in which the ground conductor GND was formed in the inner layer, the space | interval G of the coil conductor 9 and the ground conductor GND can be made wide, and azimuth angle (theta) of a magnetic flux will be mentioned later. ) Higher communication characteristics at 0 °.

Moreover, the antenna coil 21 is arrange | positioned so that the 1st conductor part 11 of the coil conductor 9 may be closer to the ground conductor GND than the 2nd conductor part 12. FIG.

In addition, the antenna coil 21 is arrange | positioned so that the 1st conductor part 11 of the coil conductor 9 may be located in the vicinity of the edge part E of the longitudinal direction of the housing 200. FIG. The longitudinal end of the housing 200 is a portion that becomes the upper end in a state in which the communication terminal device is vertically held.

In addition, the magnetic core 8 of the antenna coil 21 is configured and arranged so that the end of the magnetic core 8 protrudes by the distance T from the end of the ground conductor GND when viewed in plan view. This distance T is 1-5 mm (about 3 mm on average conditions), for example. This structure makes it easier to acquire magnetic flux.

In this communication terminal device 201, a strong magnetic field is generated at the end portion (the upper end portion) E in the longitudinal direction of the housing 200, and has good directivity at a wide angle from the A direction to the B direction in Fig. 4C. Has Therefore, when the end portion (the upper end portion) E in the longitudinal direction of the housing 200 is communicated with the communication partner while facing the communication partner, communication with the communication partner is possible in a wide angle range.

5 and 6 are diagrams schematically showing the state of the magnetic flux passing through the antenna coil when the angle θ shown in FIG. 4C is changed. In Figures 5 and 6 the magnetic flux is shown as broken lines.

When (theta) = 90 degrees, as shown to FIG. 5 (A), a magnetic flux will fall to the inner end part from the outer end part (end position of the ground conductor GND) of the magnetic core 8. When (theta) = 45 degrees, as shown to FIG. 5 (B), a magnetic flux enters in the outer edge part and the 2nd main surface MS2 of the magnetic core 8, and falls to the inner edge part of the magnetic core 8. Even when θ = 90 ° and even when θ = 45 °, the magnetic flux passes through the winding center of the coil conductor.

When (theta) = 0 degrees, as shown to FIG. 6 (A), the magnetic flux (phi) which enters into the magnetic core 8 from the 2nd main surface MS2 of the magnetic core 8, and falls to an outer edge part arises. Moreover, as shown to FIG. 6 (B) which is a perspective view, the magnetic flux (phis1, phis2) which enters the magnetic core 8 from 2nd main surface MS2 of the magnetic core 8, and falls to the side of the ground conductor GND. ) Thus, even when θ = 0 °, the magnetic flux passes through the winding center of the coil conductor as θ = 90 ° and θ = 45 °.

Fig. 7 is a diagram showing a state where communication terminal devices communicate with each other, Fig. 7 (A) is a perspective view of a state where communication terminal devices communicate with each other, and Fig. 7 (B) is a cross-sectional view thereof. Communication is performed in a state where the upper end portions E of the first communication terminal device 201A and the second communication terminal device 201B are in close proximity. In this example, if the two communication terminal devices 201A and 201B are in mirror plane symmetry, the angle formed by the housing relative to the mirror plane is almost 45 °. In addition, the antenna coil 21 is located closer to the counterpart antenna than the ground conductor GND.

As shown in Fig. 5B, the coil conductors of the antenna coil 21 are interlinked with the magnetic flux in the 45 ° direction, so that the upper ends E of the communication terminal devices face each other at an angle as shown in Fig. 7. Also, the communication terminal devices can perform wireless communication.

Fig. 8 is a diagram showing another state in which communication terminal devices communicate with each other, Fig. 8 (A) is a perspective view of a state where communication terminal devices communicate with each other, and Fig. 8 (B) is a cross-sectional view thereof. Communication is performed in a state where the upper end portions E of the first communication terminal device 201A and the second communication terminal device 201B are in close proximity. In this example, if the two communication terminal devices 201A and 201B are in mirror plane symmetry, the angle formed by the housing relative to the mirror plane is approximately 90 °. Here, in FIG. 8A, the upper end portions E of the two communication terminal apparatuses 201A and 201B are drawn to face each other with an angle, but this is only a representation in the drawing, and the upper end portions E of both sides face in parallel. Doing.

As shown in Fig. 5A, the coil conductor of the antenna coil 21 also intersects with the magnetic flux in the 90 ° direction, so that even if the upper end portions E of the communication terminal apparatus face each other as shown in Fig. 8, the communication terminal apparatus is straight. Wireless communication can be performed with each other.

In this manner, communication can be performed in a wide range of angles that bring the communication terminal device to the antenna device on the communication partner side.

≪ Second Embodiment >

9 is a diagram illustrating a configuration of an antenna coil according to the second embodiment.

9A is a plan view of the flexible base material 10 in a state where the coil conductor 9 is formed. The coil conductor 9 is formed on the upper surface of the flexible base material 10.

FIG. 9B is a diagram showing the shape of the upper coil conductor portion 9S of the coil conductor 9. FIG. 9C is a view showing the shape of the lower coil conductor portion 9U of the coil conductor 9. 9D is a view showing a state where the lower coil conductor portion 9U and the upper coil conductor portion 9S overlap.

The lower coil conductor portion 9U and the upper coil conductor portion 9S each have a substantially rectangular spiral shape, and an insulating layer is interposed between the lower coil conductor portion 9U and the upper coil conductor portion 9S. However, the inner end of the lower coil conductor part 9U and the inner end of the upper coil conductor part 9S are conductive, and both are connected in series. In this way, the coil conductor 9 is formed in a spiral shape around the coil conductor opening CW.

The flexible base 10 is provided with a terminal electrode 91 continuous to the outer end of the upper coil conductor portion 9S. Further, a terminal electrode 92 is provided which is connected to the outer end of the lower coil conductor portion 9U.

On the other hand, instead of forming the lower coil conductor portion 9U and the upper coil conductor portion 9S on one surface of the flexible substrate 10, they may be formed on both surfaces of the flexible substrate 10, respectively.

As shown to FIG. 9 (A), opening part AP is formed in the flexible base material 10 in the position corresponding to the said coil conductor opening part CW.

FIG. 10 (A) is a plan view of the antenna coil 22, and FIG. 10 (B) is a front view of the antenna device including the antenna coil 22. FIG.

The magnetic core 8 is inserted through the opening AP of the flexible base 10. Thereby, the antenna coil 22 is comprised. The antenna device is configured by placing the antenna coil 22 in close proximity or directly mounting it on the circuit board 20. The antenna coil 22 is disposed so that the forming surfaces of the terminal electrodes 91 and 92 shown in Fig. 9A face the circuit board 20, and the terminal electrodes 91 and 92 are connected to the electrodes on the circuit board 20. Is connected.

On the other hand, when the lower coil conductor part 9U and the upper coil conductor part 9S of the coil conductor 9 shown in FIG. 9 are planarized, the main part of the lower coil conductor part 9U and the upper coil conductor part 9S. It is arrange | positioned so that they may not overlap. Therefore, the stray capacitance between each conductor of the coil conductor 9 can be reduced, and the antenna coil which has a desired characteristic can be comprised.

≪ Third Embodiment >

In the third embodiment, an example of arrangement and electrical connection of the antenna coil in the housing of the communication terminal device is shown.

Fig. 11A is a sectional view of an essential part of the communication terminal device, and Fig. 11B is a front view of the antenna coil. The coil conductor 9a and the coil conductor 9b are formed in the upper surface of the flexible base material 10, respectively. These patterns are the same as those shown in FIG. 9 in the second embodiment. In the example shown in FIG. 9, two layers of coil conductors were formed on one surface of the flexible base material. In the example of FIG. 11, the coil conductors were formed on both sides of the flexible base material and connected via a via electrode at a predetermined site.

As shown in Fig. 11A, the antenna coil 23 is attached to the inner surface of the housing 200 of the communication terminal device. In addition, the antenna coil 23 is disposed so that the first conductor portion 11 located near the end portion in the longitudinal direction of the housing 200 is on the circuit board 20 side.

The housing 200 is composed of upper and lower housings that can be separated into a plane parallel to the plane of the circuit board 20. The contact pin 31 standing on the circuit board 20 is in contact with the terminal electrode 91 of the coil conductor with the upper housing on which the antenna coil 23 is mounted on the lower housing. As a result, the power feeding circuit provided on the circuit board 20 and the antenna coil 23 are electrically connected. With such a configuration, the distance G between the coil conductor and the ground conductor GND can be made larger. Therefore, in particular, as shown in FIG. 6, the directivity in the θ = 0 ° direction can be improved.

≪ Fourth Embodiment >

In 4th Embodiment, the example of the formation position of the terminal electrode of a coil conductor is shown.

12A is a plan view of the antenna coil 24, and FIG. 12B is a front view. The position of the terminal electrode of the coil conductor is different from that of the antenna coil 21 shown in FIG. In the example of FIG. 12, the terminal electrodes 91 and 92 serving as connection terminals to the power feeding circuit are arranged at positions not overlapping with the magnetic core 8 when viewed in plan view. Therefore, in the state where the contact pins are in contact with the terminal electrodes 91 and 92, the contact pins have little adverse effect on the transmission and formation of the magnetic flux. In addition, it is preferable that both of the terminal electrodes 91 and 92 are oriented on one side of the magnetic core when not planarized (not across the magnetic core 8).

`` Fifth Embodiment ''

FIG. 13A is a plan view of the magnetic core 8 provided in the antenna coil according to the fifth embodiment, and FIG. 13B is a plan view of the antenna coil 25 according to the fifth embodiment.

The difference from the antenna coil 21 shown in FIG. 3 in the first embodiment is that one end of the magnetic core 8 is formed thicker (wider) than the other part.

By using the magnetic core 8 of such a shape, the magnetic flux passing through the magnetic core 8 is strengthened, the magnetic field coupling with the antenna of the communication partner can be strengthened, and the communication distance is improved, such as the longest communication distance. . Here, in FIG. 13B, the thick portion of the magnetic core 8 is close to the first conductor portion 11 to form the antenna coil 25, but the thick portion of the magnetic core 8 is formed of the second conductor portion 12. ), An antenna coil may be formed in proximity. The thick portion (wide portion) of the magnetic core 8 is not limited to either the portion close to the first conductor portion 11 or the portion close to the second conductor portion 12. As described above, by making one end of the magnetic core 8 thicker than the other part, the dust collecting effect is increased and the communication performance is further improved. Further, by thickening the end of the magnetic core serving as the end side of the ground conductor, the magnetic resistance near the end of the ground conductor is lowered and the dust collecting effect is increased.

On the other hand, in the antenna coil 25 shown in FIG. 13, although the whole one end part of the magnetic core 8 is formed wide (bold), this part may be trapezoid shape wider toward the outer side. Further, a butterfly may be formed in which both widths are widened from the center of the magnetic core 8 to both ends.

`` Sixth Embodiment ''

14A is a plan view of the magnetic core 8 provided in the antenna coil according to the sixth embodiment, and FIG. 14B is a plan view of the antenna coil 26 according to the sixth embodiment. This antenna coil 26 is provided with the flexible base material 10 in which the coil conductor was formed, and the rectangular-shaped magnetic core 8. The difference from the antenna coil 25 shown in FIG. 13B is the structure of the magnetic core 8.

The magnetic core 8 shown in FIG. 14 (A) is obtained by breaking a laminate of both sides of a flat plate-like ferrite into which a cut line is inserted in the shape of a checkerboard with a film by breaking at the cut line. The part divided by the broken line in FIG. 14 (B) has shown the small piece of a sintered magnetic body. By such a configuration, the entire magnetic body sheet 1 has flexibility. Therefore, the antenna coil provided with this magnetic body sheet 1 can be easily arrange | positioned along the surface of a support stand. For example, it can provide along the inner surface of the housing of a portable terminal. Therefore, it can be easily embedded in the housing of various shapes.

On the other hand, in FIG. 14B, the antenna coil 22 is formed by bringing the thick portion of the magnetic core 8 close to the first conductor portion 11. However, as described in the fifth embodiment, the magnetic core 8 The thick portion (wide portion) is not limited to either the portion close to the first conductor portion 11 or the portion close to the second conductor portion 12. As described above, by making one end of the magnetic core 8 thicker than the other part, the dust collecting effect is increased and the communication performance is further improved.

`` Seventh Embodiment ''

15 is a sectional view of an essential part of a communication terminal device according to a seventh embodiment. In this example, the antenna coil 27 is attached to the inner curved surface of the housing 200. In particular, as shown in FIG. 14, when the flexible magnetic core is used and further, the flexible coil conductor provided on the flexible base material is used, the antenna coil 27 has flexibility, and therefore is not limited to a single plane in the housing 200. It can be provided along the curved surface of the housing without. Therefore, it can be easily incorporated in the housing of various shapes. In addition, by attaching the antenna coil 27 to the inner surface of the housing 200, the distance between the antenna coil 27 and the ground conductor GND in the circuit board 20 can be increased to increase the passage area of the magnetic flux. Therefore, a better communication state can be ensured.

`` Eighth Embodiment ''

The eighth embodiment shows an example applied to a clamshell type communication terminal device.

Fig. 16A is a perspective view of the communication terminal device 208, and Fig. 16B is a sectional view thereof. The housing of the communication terminal device 208 is composed of a top side housing 200A and a bottom side housing 200B. In this case, the antenna coil 21 is disposed near the upper end E of the top housing 200A. The liquid crystal display panel 41 enters the top housing 200A. Since the shield plate 41S is attached to the rear surface of the liquid crystal display panel 41, the shield plate 41S corresponds to the planar conductor according to the present invention. The bottom housing 200B is provided with a key input section 42 and a circuit board 20.

With this structure, when the top side housing 200A and the bottom side housing 200B are folded, the antenna coil 21 is sandwiched between the ground conductor GND of the bottom side housing 200B and the shield plate of the top side housing 200A. Therefore, even when folded, the antenna coil 21 can be used for wireless communication.

`` Ninth Embodiment ''

In the ninth embodiment, an example applied to a slide type communication terminal device is shown.

Fig. 17A is a perspective view of the communication terminal device 209, and Fig. 17B is a sectional view thereof. The housing of the communication terminal device 209 is composed of a top side housing 200A and a bottom side housing 200B. In this case, the antenna coil 21 is disposed near the upper end E of the top housing 200A. The liquid crystal display panel 41 enters the top housing 200A. Since a shield plate is affixed to the back surface of this liquid crystal display panel 41, this shield plate corresponds to the planar conductor which concerns on this invention. The bottom housing 200B is provided with a key input section 42 and a circuit board 20.

When the top housing 200A is housed, the ground conductor of the circuit board 20 in the bottom housing 200B is patterned so that the portion overlapping with the antenna coil 21 becomes a non-ground region. With this structure, even when the top-side housing 200A is housed, wireless communication can be performed using the antenna coil.

`` Tenth Embodiment ''

In the tenth embodiment, the relationship between the proximity position of the magnetic core to the coil conductor of the antenna coil and the coupling coefficient is shown.

18 is a sectional view of an essential part of a communication terminal device according to a tenth embodiment. The coil conductor 9a and the coil conductor 9b are formed in the upper surface of the flexible base material 10, respectively.

As shown in FIG. 18, the antenna coil 23 is attached to the inner surface of the housing 200 of the communication terminal device. In addition, the antenna coil 23 has a second conductor portion 12 located near the end portion in the longitudinal direction of the housing 200 so that the outer surface side of the housing 200 (communication side, upper side in the direction of FIG. 18). It is arranged to face.

The housing 200 is composed of upper and lower housings that can be separated into a plane parallel to the plane of the circuit board 20. The contact pin 31 standing on the circuit board 20 is in contact with the terminal electrode 91 of the coil conductor with the upper housing on which the antenna coil 23 is mounted on the lower housing. As a result, the power feeding circuit provided on the circuit board 20 and the antenna coil 23 are electrically connected.

The difference from the antenna coil 23 shown in Fig. 11 in the third embodiment is the position of the magnetic core close to the coil conductor of the antenna coil. Where A is the length of the portion where the first conductor portion 11 of the coil conductor is close to the magnetic core 8 and A is the length of the portion where the second conductor portion 12 of the coil conductor is close to the magnetic core 8. It is comprised so that it may become a relationship of A <B. The length A of the portion where the first conductor portion 11 of the coil conductor is close to the magnetic core 8 is configured to be smaller than the width C of the first conductor portion 11.

According to this configuration, the ineffective magnetic flux phi i not interlinked with respect to the antenna coil becomes small, and thus the magnetic flux phi a effectively interlinked becomes large. Therefore, the coupling coefficient with the antenna of the communication partner such as the reader / writer antenna increases.

FIG. 19 is a diagram showing a change in the coupling coefficient with the reader / writer antenna when the positional relationship between the magnetic core 8 and the coil conductor is changed. The conditions for obtaining this measurement result are as follows.

[Magnetic Core 8]

Length 15mm

Width 16mm

[Coil conductor]

Dimensions 15 × 20mm

* Width C of the first conductor portion 11 2 mm

Width B of 2nd conductor part 12 2mm

[Relation with Ground Electrode]

3 mm gap between the magnetic core 8 and the ground electrode GND

[Relation with reader / writer antenna]

17mm distance from the reader / writer antenna

The horizontal axis 'magnetic core shift amount X' in FIG. 19 refers to the length A of the portion where the first conductor portion 11 of the coil conductor is close to the magnetic core 8 and the second conductor portion 12 is the magnetic material. The dimension which subtracted from the length B of the part which adjoins the core 8 is said.

Under these conditions, as shown in FIG. 19, a high coupling coefficient is obtained in the range where the magnetic core shift amount X is in the range of 2 to 7.5 mm. The magnetic core shift amount X = 7.5 mm here corresponds to a state in which the magnetic core 8 is close to only the second conductor portion 12 of the coil conductor. Therefore, in general, the shift amount of the magnetic core exceeds 0, and it can be said that it is effective to set the magnetic core 8 within a range up to the state where the magnetic core 8 is close to only the second conductor portion 12 of the coil conductor.

The length A of the portion where the first conductor portion 11 of the coil conductor is close to the magnetic core 8, and the length of the portion where the second conductor portion 12 of the coil conductor is close to the magnetic core 8 ( In the relationship of B), it can be said that it is preferable to set it as the relationship of A <B.

`` Eleventh embodiment ''

20 is a front view of an antenna coil provided in the communication terminal device according to the eleventh embodiment. This antenna coil is provided with the magnetic core 8 which has the 1st main surface MS1 and the 2nd main surface MS2, and the flexible base material 10 in which the coil conductor of the spiral pattern was formed. The coil conductor is positioned on the first conductor portion 11 located on the first main surface MS1 side of the magnetic core 8 and on the second main surface MS2 side of the magnetic core 8. It has the 2nd conductor part 12 arrange | positioned in the position (non-overlapping position) different from the 1st conductor part 11 when it is planarly viewed in MS1) direction or 2nd main surface MS2 direction.

21 (A), 21 (B) and 21 (C) are front views of the antenna coil for comparison and comparison. 21 (A) uses the magnetic core 8 refracted in step shape, and the flexible base material 10 is made flat. FIG. 21B includes a flat magnetic core 8 and a flexible substrate 10 refracted in a step shape. FIG. 21C includes a flat magnetic core 8 and a flexible base 10 refracted in a slope shape.

In the structure of FIG. 21 (A), since the magnetic core 8 is refracted in a staircase shape, as shown by the broken arrow, the magnetic flux is large, so that the magnetic flux effectively bridges the coil conductor of the antenna coil. Low magnetic flux density In addition, the overall thickness is thick. In the structure of Fig. 21B, the coupling coefficient with the magnetic flux in the direction along the plane direction of the magnetic core 8 is high, but since the coil conductor is bent at an acute angle, the overall length of the coil conductor is long and the resistance value is high. The Q value is low. In the structure of Fig. 21C, the overall length of the coil conductor is shorter than that of Fig. 21B, but the resistance value is high and the Q value is low.

On the other hand, according to the antenna coil shown in FIG. 20, since the magnetic core 8 is not refracted at an acute angle, the leakage magnetic flux is small and effective magnetic flux can be derived. In addition, the overall length of the coil conductor is short, and the resistance value is low. Furthermore, since the magnetic core 8 and the opening surface of the coil conductor cross each other at an angle close to 90 degrees, the efficiency is good. In other words, the magnetic flux is bridged at an angle close to 90 degrees with respect to the opening surface of the coil, so that the effective opening surface can be seen to be large and generate large electromotive force.

According to the antenna coil shown in Fig. 20, a high gain is obtained over a wide angle between the angle formed by the antenna coil and the magnetic flux. In particular, a high characteristic is obtained with respect to the gain in the 45 degree direction.

`` Other Embodiments ''

On the other hand, although the antenna coil was arrange | positioned facing the planar conductor in some embodiment shown above, a planar conductor is not essential. In addition, the antenna coil may be disposed at a position that does not face the planar conductor.

In each of the embodiments described above, the shield plate disposed on the ground electrode of the circuit board or the rear surface of the liquid crystal display panel is shown as an example of the planar conductor, but the conductor film, the conductor foil, and the battery pack formed on the inner surface of the housing May be treated as a flat conductor to form an antenna device. In addition, the planar conductor is not limited to the rectangular conductor and may be various planar shapes. In addition, the planar conductor is not limited to a single layer, but may be composed of a plurality of layers. Furthermore, the planar conductor may be a planar main part thereof and may have a bent portion at another part.

The same applies to the case where the housing of the communication terminal device is a swivel type.

In addition, although each embodiment showed the example using the circuit board in which the ground conductor was formed in the inner layer, it can apply similarly to the thing provided with the circuit board in which the ground conductor was formed in the surface.

Moreover, in some embodiment shown above, although the antenna coil was arrange | positioned inside the housing, you may arrange | position an antenna coil on the outer surface of a housing (holding an antenna coil in the outer surface of a housing). In this case, the input and output terminals of the antenna coil may be pulled into the housing.

AP opening
CW coil conductor opening
E upper part of housing (length end)
GND ground conductor (flat conductor)
First principal plane of MS1 magnetic core
Second principal plane of MS2 magnetic core
8 ferrite core
9 coil conductor
9a, 9b coil conductor
9S upper layer coil conductor
9U lower layer coil conductor
10 Flexible Base
11 First conductor part
12 Second conductor part
20 Circuit Board
21 to 27 antenna coil
31 contact pin
41 LCD panel
42 key input
101 antenna unit
200 housing
200 A top-side housing
200B bottom side housing
201, 208, 209 Communication terminal device
201A 1st communication terminal device
201B 2nd communication terminal device

Claims (7)

An antenna coil comprising a magnetic core having a first main surface and a second main surface, and a coil conductor wound around the magnetic core, and a housing for housing or holding the antenna coil ( A communication terminal device having a housing)
The coil conductor is located in the first conductor portion located on the first main surface side of the magnetic core and on the second main surface side of the magnetic core and is planar in the first main surface direction or the second main surface direction. Has a second conductor portion disposed at a position different from the first conductor portion,
The antenna coil is disposed such that the second main surface side of the magnetic core faces the outer surface side of the housing,
The housing has a first main surface and a second main surface disposed opposite to the first main surface of the housing,
The antenna coil is provided on the first main surface side of the housing,
And a first conductor portion of the coil conductor is located near an end of the housing. The method of claim 1,
The length of the portion where the second conductor portion of the coil conductor is close to the magnetic core is greater than the length of the portion where the first conductor portion of the coil conductor is close to the magnetic core of the magnetic core and the coil conductor. Communication terminal device, characterized in that configured to. The method of claim 2,
The magnetic core and the coil conductor are configured so that the length of the portion where the first conductor portion of the coil conductor is close to the magnetic core is smaller than the width of the first conductor portion. 4. The method according to any one of claims 1 to 3,
And the antenna coil is arranged such that the first conductor portion of the coil conductor is positioned near an end portion in the longitudinal direction of the housing. 4. The method according to any one of claims 1 to 3,
And a circuit board having a planar conductor in the housing, wherein the antenna coil is disposed to face the planar conductor. 4. The method according to any one of claims 1 to 3,
And said magnetic core is a hybrid of magnetic powder and a resin material or a sintered magnetic body plurally compacted into a sheet shape. 4. The method according to any one of claims 1 to 3,
And said magnetic core has a width of a portion proximate said first conductor portion greater than a width of a portion proximate said second conductor portion.

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