JP4578728B2 - Portable equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable device including an antenna coil and a control circuit, and a data carrier that transmits and receives electromagnetic waves is fixed in a case.
[0002]
[Prior art]
For portable devices such as mobile phones and personal digital assistants (PDAs), when manufacturing management, distribution management, recycling management, etc., the manufacturer name, date of manufacture, and manufacturing lot number of the mobile device Various unique information such as model, specification, etc. is important.
[0003]
Conventionally, in order to attach such information to individual portable devices, for example, a method of attaching a paper on which various kinds of information are written inside a case of the portable device or attaching a stamped name plate is employed.
[0004]
However, since mobile phones and the like are reduced in size and weight year by year, the amount of information to be recorded is limited by the above method. Further, information by paper or a metal plate cannot be read and managed by an electronic reader machine and connected to a computer online.
[0005]
It is also conceivable to attach personal information to the portable device. Personal information includes name, address, date of birth, cash card, and personal identification number for opening and closing the door. By attaching the personal information to the portable device, it is possible to use the device as if the IC card is built in the portable device. Examples of such usage include authentication in the case of theft or loss, personal authentication of government offices, hospitals, etc., personal authentication of commuter passes in transportation facilities such as JR, etc., and personal search and cooperation with GPS.
[0006]
On the other hand, an extremely small RFID tag (Radio frequency Identification TAG) equipped with an antenna coil and control circuit, etc. for storing information electronically and transmitting and receiving information to and from a reader machine in a non-contact manner using electromagnetic waves Data carriers are known.
[0007]
There are two types of these data carriers (slave devices): a portable type, or a fixed type that can be mounted on a device, machine, or various parts, both of which are high frequency electromagnetic waves in the wireless communication area. Data transmission / reception (communication) is performed without contact with a reader / writer (or reader).
[0008]
Normally, the data carrier itself does not have a power source such as a battery for operation, and is configured to use a part of the electromagnetic wave transmitted from the reader / writer machine as the power source.
[0009]
FIGS. 7A and 7B are views for explaining the structure of a data carrier having cylindrical and disk-shaped antenna coils, and FIG. 8 is a block diagram thereof. As shown in FIG. 7, a general data carrier 1a, 1b has an antenna coil 2a formed by winding a copper wire around a core 10 into an elongated cylinder shape, or a disk-shaped antenna coil formed by winding a conducting wire around an air core coil. 2b and an IC circuit 3 connected to both ends of the antenna coils 2a and 2b.
[0010]
As shown in FIG. 8, the IC circuit 3 includes a transmission / reception circuit 4, a CPU (Central Processing Unit) 5, a memory 6 having a writable nonvolatile memory element, and a capacitor 7 for storing power. These antenna coils 2a, 2b and IC circuit 3 are integrally formed into a thin rod shape, a thin disk shape or a card shape using a glass container 8 which is a non-conductive material or a sealed container 9 such as a resin, or Laminated to form a sealed mold that is protected from the external environment.
[0011]
The transmission / reception method of the data carriers 1a and 1b will be described with reference to FIG. 8. First, a reader / writer device (not shown) transmits the electromagnetic waves for calling the data carriers 1a and 1b and transmitting power in the first step. Then, the data carriers 1 a and 1 b receive the electromagnetic waves by the tuning action of the antenna coils 2 a and 2 b and the transmission / reception circuit 4 and store the electric power in the capacitor 7. As a result, the data carriers 1a and 1b are in an operating state, and in the next step, read electromagnetic waves are transmitted from the reader / writer machine to the data carriers 1a and 1b.
[0012]
The electromagnetic waves are input from the antenna coils 2a and 2b of the data carriers 1a and 1b to the CPU 5 through the transmission / reception circuit 4, and the CPU 5 reads out necessary information from the memory 6 accordingly, and reads the information from the transmission / reception circuit 4 to the antenna coils 2a and 2b. Then, it is transmitted as electromagnetic waves to the reader / writer. The writing of data from the reader / writer machine to the memory 6 of the data carriers 1a and 1b is also executed according to the above method. These series of steps are performed almost instantaneously.
[0013]
9 and 10 explain the relationship between the antenna coils 2a and 2b and the electromagnetic waves. In general, an electromagnetic wave can be represented by an electric field and a magnetic field that propagate in an alternating manner with a phase difference of 90 degrees, and a current (high-frequency current) that flows through the antenna coils 2a and 2b when the magnetic field and the antenna coils 2a and 2b are linked. Is used for transmission and reception.
[0014]
For example, when electromagnetic waves are transmitted from the antenna coils 2a and 2b, a high-frequency magnetic field component H as shown in each figure due to a high-frequency current flowing through the antenna coils 2a and 2b passes through the center of the antenna coils 2a and 2b (magnetic flux). When the antenna coil of the reader / writer device is placed in this magnetic flux region, the reader / writer device can receive information from the data carriers 1a and 1b.
[0015]
Similarly, when electromagnetic waves are transmitted from the reader / writer machine, a magnetic field component H as shown is distributed around the antenna coils 2a and 2b of the data carriers 1a and 1b, and the antenna coils 2a and 2b receive it. It will be.
[0016]
The distance at which the data carriers 1a and 1b configured as described above can communicate with the reader / writer, that is, the communication distance is usually several millimeters to several centimeters. For example, in the case of an automatic ticket gate of a railway, a data carrier such as a commuter pass can be read by being inserted into the insertion slot and passing through a reader section provided inside the apparatus, so there is almost no problem of communication distance. .
[0017]
[Problems to be solved by the invention]
However, in the case where management is performed by attaching an RFID tag or the like as a data carrier to an article, the range of use is limited if the communication distance is short. Further, depending on the management form, it may be required that communication directivity is high in a specific direction. Thus, various proposals have been made for methods for extending the communication distance of a data carrier or improving directivity.
[0018]
As described above, an electromagnetic wave is composed of an electric field wave and a magnetic field wave of 90 degrees different from each other, and transmission and reception are performed using an electromotive force (or current) induced by the magnetic flux constituting the magnetic field component H interlinking the antenna coil. I can do it.
[0019]
However, if the data carrier is placed close to a conductive member such as metal, the transmission / reception magnetic flux is linked to the conductive member, generating eddy currents there, thereby reducing the magnetic flux available for transmission / reception. There is a problem.
[0020]
In fact, the inventors have tried to attach the data carriers 1a and 1b in the case of the mobile phone and send / receive data to / from the reader device from the outside. However, in the case, a printed circuit board or a metal battery container that uses a lot of copper. It has been found that there are many cases where transmission / reception cannot be performed due to a decrease in magnetic flux for the above-mentioned reason, because conductive members such as the above or metal parts are densely accommodated.
[0021]
In particular, in the case of the data carrier 1b having the disk-shaped antenna coil 2b that has been generally used as a data carrier in each field, it has been difficult to communicate at all locations in the case of the mobile phone. In addition, when the case is made of a conductive material such as aluminum, or when it has conductivity, such as when the surface is plated with a conductive material, either a cylindrical or disk-shaped antenna is used. Transmission and reception were difficult even with the data carriers 1a and 1b having the coils 2a and 2b.
[0022]
The present invention solves the above-mentioned problems, and an object of the present invention is to attach a data carrier in a case of a portable device, and in the case of the portable device, the direction of the magnetic flux that the data carrier uses for transmission and reception. It is an object of the present invention to provide a portable device that can reliably transmit and receive a large amount of unique information by effectively using the formed magnetic flux leakage path to ensure a magnetic flux level that can be transmitted and received.
[0023]
[Means for Solving the Problems]
To achieve the above object, a portable device according to the present invention is provided. A A portable device comprising an antenna coil and a control circuit, in which a data carrier that transmits and receives by electromagnetic waves is fixed in a case, wherein the antenna coil has a disk shape, and the antenna coil surface is formed on the case surface of the portable device. While fixing in parallel, the first sheet-like magnetic body having a high relative permeability is extended from one side of the antenna coil, and the second sheet-like magnetic body having a high relative permeability is extended in the opposite direction from the other side. The first and second sheet-like magnetic bodies form a continuous magnetic flux path that passes through the antenna coil, and further on the extension of the first and second sheet-like magnetic bodies outside the case of the portable device. A magnetic flux leakage path is formed.
[0024]
According to the above configuration, the first sheet-like magnetic body having a high relative permeability is extended from one side of the disk-shaped antenna coil, and the second sheet-like magnetic body having a high relative permeability is extended in the opposite direction from the other side. The first and second sheet-like magnetic bodies form a continuous magnetic flux path passing through the disk-shaped antenna coil, and the portable device is further extended on the extension of the first and second sheet-like magnetic bodies. By forming a magnetic flux leakage path outside the case, even if the conductive member is densely present inside the case of the portable device, the unique information recorded on the data carrier can be reliably transmitted to the external reader by non-contact with electromagnetic waves. Can be sent to. Further, by providing a sheet-like magnetic body having a high relative permeability, communication directivity can be improved, and the communication distance in that direction can be increased.
[0025]
Therefore, a large amount of unique information can be attached to the inside of a portable device having an extremely small volume, and online computer management can be performed stably. It is particularly effective for miniaturized portable devices.
[0026]
Further, when the portable device case has conductivity and is divided, and the magnetic flux leakage path is formed in the divided portion of the portable device case, the portable device case has conductivity. Even if it is a case, it can communicate reliably with the outside.
[0027]
In addition, when the data carrier is fixed to the bottom surface or the back surface of the battery mounting portion where the battery unit is detachably mounted, the data carrier having a disk-shaped antenna coil is stabilized in order to effectively use the usable space. And can be fixed.
[0028]
Further, when the portable device is a mobile phone, the present invention is extremely miniaturized, and the effect is further enhanced by applying it to a mobile phone in which conductive members are tightly accommodated. In addition, the number of mobile phones used is rapidly increasing due to their convenience, which is advantageous when performing production management, distribution management, recycling management, and the like.
[0029]
In addition, as a portable device, a portable information terminal (PDA) and the like can be configured in the same manner in addition to the cellular phone, and the same effect can be obtained.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment when applied to a mobile phone as an example of a portable device according to the present invention will be specifically described with reference to the drawings. FIG. 1 is an exploded explanatory view showing a configuration of a portable device according to the present invention, and shows a state in which data carriers are provided in upper and lower cases, respectively.
[0031]
2A and 2B are a side view and a front view showing a state in which a data carrier having a cylindrical antenna coil is attached by a holding member provided on the inner surface side of the case of the portable device, FIG. (C) is a front view which shows a mode that the data carrier which has a cylindrical antenna coil was attached using the hole provided in thick parts, such as a corner part of the case of a portable apparatus.
[0032]
FIG. 3 shows a data carrier having a cylindrical antenna coil, in which a sheet-like magnetic body having a high relative permeability extending outward from a magnetic flux generation site formed on the antenna coil is arranged on one side of the antenna coil. It is side sectional explanatory drawing which shows a mode that it attached to the inner surface side of the case of a portable apparatus.
[0033]
4 and 5 show a data carrier having a disk-like antenna coil, in which a first sheet-like magnetic body having a high relative permeability is extended from one side of the antenna coil and a high relative permeability is provided from the other side. It is side sectional explanatory drawing and plane explanatory drawing which show a mode that 2 sheet-like magnetic bodies were extended and arrange | positioned in the reverse direction, and were attached to the inner surface side of the case of a portable apparatus.
[0034]
FIG. 6 shows a data carrier having a disk-shaped antenna coil, in which a sheet-like magnetic body having a high relative permeability extending outward from a magnetic flux generation site formed on the antenna coil is arranged on one side of the antenna coil. It is side sectional explanatory drawing which shows a mode that it attached to the back surface side of the battery unit mounting part of the case of an apparatus.
[0035]
In FIG. 1, a mobile phone 11 as an example of a portable device includes an upper case 11a and a lower case 11b, and the upper and lower cases 11a and 11b are fitted in a fitting manner. Conductive members such as the printed circuit board 13 are densely accommodated in the upper and lower cases 11a and 11b. The lower case 11b is provided with a battery mounting portion 11c for detachably mounting the battery unit 12.
[0036]
In FIG. 1, 14 is a key operated when making a call using the mobile phone 11, sending and receiving e-mails, and using the Internet, and 15 is configured to be rotatable about a shaft 15a. A lid for opening and closing the portion of the key 14. Reference numeral 16 denotes a telescopic antenna attached to the mobile phone 11.
[0037]
FIG. 1 shows three examples in which various data carriers 1a and 1b described later in detail are fixed in the upper and lower cases 11a and 11b. In the first example, the data carrier 1a having the cylindrical antenna coil 2a is fixed to the inner surface of the upper case 11a. In the second example, the data carrier 1a having the same cylindrical antenna coil 2a on the inner surface of the lower case 11b. The third example is an example in which the data carrier 1b having the disk-shaped antenna coil 2b is fixed to the bottom surface or the back surface of the battery mounting portion 11c.
[0038]
Since the outer diameter of the data carrier 1b having the disk-shaped antenna coil 2b is large, it is desirable to fix the data carrier 1b to the battery mounting portion 11c that can ensure a relatively large installation area.
[0039]
Each data carrier 1a, 1b includes a cylindrical antenna coil 2a or disk-shaped antenna coil 2b and an IC circuit 3 serving as a control circuit as described above with reference to FIGS. Do.
[0040]
The upper case 11a and the lower case 11b are formed in a U-shaped cross section with a bottom surface and a peripheral wall having a low height, and as shown in FIG. 7, a data carrier 1a having an elongated cylindrical antenna coil 2a in which a copper wire is wound around a core 10. Are fixed parallel to the printed circuit board 13 and parallel to the surfaces of the upper and lower cases 11a and 11b, and a magnetic flux leakage path to the outside of the upper and lower cases 11a and 11b is formed on the axial extension of the antenna coil 2a.
[0041]
When the upper and lower cases 11a and 11b of the mobile phone 11 are conductive, a magnetic flux leakage path is formed in the divided portion of the split type upper and lower cases 11a and 11b.
[0042]
The amount of leakage magnetic flux in the magnetic flux leakage path increases as the gap to be formed increases. Accordingly, the gap width is determined by the desired communication sensitivity, but in order to stably secure a good communication sensitivity level by a normal reader device, the gap width should be several μm to several hundred μm. More preferably, it is about several tens of micrometers to several hundreds of micrometers. In some cases, it may be several mm, but the upper limit is limited by the sealing property desired by the case.
[0043]
2 (a) and 2 (b), the upper and lower cases 11a and 11b of the mobile phone 11 are made of resin, and a fixing member 17 made of a pair of opposing springy holding pieces is integrally formed on the inner surfaces of the upper and lower cases 11a and 11b. And a cylindrical antenna coil between them 2 In this example, a data carrier 1a having a is inserted and fixed with an adhesive 18 or the like. When the upper and lower cases 11a and 11b are made of resin, the entire upper and lower cases 11a and 11b form a magnetic flux leakage path.
[0044]
By making the axial direction of the antenna coil 2a parallel to the surfaces of the upper and lower cases 11a and 11b, the data carrier 1a can be efficiently fixed even in a narrow space, and the direction of magnetic flux used for transmission and reception can be easily set. Can be directed to the magnetic flux leakage path. It should be noted that a space may be provided at the front or back end of the printed circuit board 13 in the upper and lower cases 11a and 11b, and the data carrier 1a may be fixed thereto by bonding or the like.
[0045]
When the upper and lower cases 11a and 11b of the mobile phone 11 are conductive, or when the printed circuit board 13 is in close proximity, the axial direction of the cylindrical antenna coil 2a is arranged in the short direction of the mobile phone 11. Communication can be easily performed by increasing the directivity and communication distance of communication by using the magnetic flux leakage path in the direction where the width of the device is narrow.
[0046]
FIG. 2C uses a thick portion 11d such as a corner portion of the upper and lower cases 11a and 11b made of resin, and the cylinder is inserted into the insertion hole 11e provided in parallel with the upper and lower cases 11a and 11b in the thick portion 11d. This is an example in which a data carrier 1 a having a rectangular antenna coil 2 a is inserted and accommodated and fixed with an adhesive 18. The data carrier 1a may be integrally molded and fixed to the inner surfaces of the upper and lower cases 11a and 11b when the upper and lower cases 11a and 11b are formed.
[0047]
FIG. 3 shows a data carrier 1a having a cylindrical antenna coil 2a. In the data carrier 1a, an amorphous magnetic sheet is used as a sheet-like magnetic body 19 having a high relative permeability extending outward from a magnetic flux generating portion formed in the antenna coil 2a. It is an example arrange | positioned on the single side | surface (this embodiment upper and lower case 11a, 11b side) of the coil 2a.
[0048]
The data carrier 1a and the sheet-like magnetic body 19 are sealed with a protective case 20 such as a resin, and the protective case 20 such as a resin is bonded to the inner surfaces of the upper and lower cases 11a and 11b with an adhesive 18.
[0049]
Since the sheet-like magnetic body 19 has a remarkably smaller magnetic resistance than the air, the magnetic flux interlinking with the antenna coil 2a can be easily extended in the longitudinal direction of the sheet-like magnetic body 19 to form a magnetic flux loop passing through the tip of the sheet-like magnetic body 19 Distributed. Therefore, the communication distance is extended mainly in the longitudinal direction of the sheet-like magnetic body 19, and the communication directivity in this direction is increased.
[0050]
The communication sensitivity of the data carrier 1 a is proportional to the magnetic flux density of the magnetic flux path φ, and the magnetic flux density is proportional to the relative permeability of the sheet-like magnetic body 19. Accordingly, the sheet-like magnetic body 19 should be selected as high as possible in the relative permeability, and a magnetic body having a relative permeability of at least 10,000 or more is desirable. An example of a magnetic body made of a magnetic material having such a high relative permeability is an amorphous magnetic body formed in a sheet shape.
[0051]
Generally, the relative magnetic permeability of an amorphous magnetic material is in the range of tens of thousands to millions, and the relative magnetic permeability is extremely high. For example, there is a sheet-like amorphous magnetic material with a relative permeability of 800,000 based on the Fe—Ni—Mo—B—S system commercially available from Allied Chemical Co. in the United States, and a sheet shape with a higher relative permeability with a similar composition. Amorphous magnetic materials are commercially available from Hitachi Metals, and any of them can be used in the present invention.
[0052]
Cylinder antenna coil 2 In the case of a, there is a magnetic flux generation site near the tip of the core 10, and the magnetic flux forms a loop from the magnetic flux generation site in the axial direction toward the tip on the opposite side.
[0053]
Therefore, a cylindrical antenna coil 2 When it is desired to increase the directivity on the outside in the axial direction in a, the sheet-like magnetic body 19 is extended outward in the axial direction from the magnetic flux generation site. Then, a considerable part of the magnetic flux from the magnetic flux generation site is guided outward in the axial direction by the high magnetic permeability sheet-like magnetic body 19, and as a result, the communicable magnetic flux region in the axial direction is expanded.
[0054]
Note that a magnetic flux region that can be three-dimensionally communicated is expanded around the axial direction in which the sheet-like magnetic body 19 is extended. In addition, since the magnetic flux loop becomes large with this configuration, as a result, a phenomenon occurs in which the communicable magnetic flux region on the outer side in the axial direction from the tip portion on the opposite side is enlarged by substantially the same size.
[0055]
Note that if the sheet-like magnetic body 19 is simultaneously extended from the magnetic flux generation portion in the axial center direction, the communicable magnetic flux region gradually decreases, and when the axial center point is exceeded, it rapidly decreases. Therefore, the sheet-like magnetic body 19 disposed in the cylindrical antenna coil 2a is preferably extended outward in the axial direction from the magnetic flux generation site, and should be kept at a relatively short distance when extending in the axial center direction at the same time.
[0056]
Carrying When the upper and lower cases 11a, 11b of the mobile phone 11 are conductive, or when the printed circuit board 13 is in close proximity, the axial direction of the cylindrical antenna coil 2a (extending direction of the sheet-like magnetic body 19) is carried. If the telephone 11 is arranged in the short direction, communication can be easily performed by increasing the communication directivity and communication distance using the magnetic flux leakage path in the direction in which the width of the device is narrow.
[0057]
4 and 5 show an example in which the data carrier 1b having the disk-shaped antenna coil 2b is fixed to the bottom or back surface of the battery mounting portion 11c provided in the lower case 11b of the mobile phone 11 with an adhesive 18 or the like.
[0058]
In FIG. 4, a first sheet-like magnetic material having a high relative permeability from one surface of the antenna coil 2b in parallel with the antenna coil surface of the disk-shaped antenna coil 2b sealed by the sealed container 9. body Extending 19a, the second sheet-like magnetism with high relative permeability from the other side body 19b is extended in the opposite direction and accommodated and fixed in a protective case 20 made of resin, etc., and the protective case 20 made of resin is arranged parallel to the bottom or back surface of the battery mounting portion 11c and fixed with an adhesive 18 Thus, the antenna coil surface of the antenna coil 2b is fixed in parallel to the upper and lower cases 11a and 11b of the mobile phone 11.
[0059]
1st and 2nd sheet-like magnetism body 19a and 19b form a continuous magnetic flux path passing through the antenna coil 2b, and the first and second sheet-like magnets. body Magnetic flux leakage paths to the outside of the upper and lower cases 11a and 11b of the mobile phone 11 are formed on the extensions of 19a and 19b.
[0060]
The example shown in FIG. 4 uses a standard data carrier 1b that is mass-produced and distributed in the market, and combines the first sheet-like magnetic body 19a and the second sheet-like magnetic body 19b with a resin or the like. It is housed in a protective case 20. The data carrier 1b in FIG. 4 is configured by sealing a disk-shaped antenna coil 2b and an IC circuit 3 in a sealed container 9 made of a thin and non-conductive material such as resin.
[0061]
Then, the first sheet-like magnetic body 19a is arranged in parallel along the upper surface of the sealed container 9 and fixed by bonding or the like, and the second sheet-like magnetic body 19b is similarly arranged along the lower surface of the sealed container 9. Place them in parallel and fix them by bonding or the like.
[0062]
The tip of the first sheet-like magnetic body 19a is extended from the left side of the antenna coil 2b arranged in the sealed container 9 slightly to the right side from the center in FIG. The tip end portion is extended from the right side to the outside in the left direction slightly from the central portion in FIG. 4 of the antenna coil 2b disposed in the sealed container 9.
[0063]
Then, the first sheet-like magnetic body 19a and the second sheet-like magnetic body 19b are accommodated in a protective case 20 such as a resin together with the sealed container 9, filled with an adhesive or the like and molded. The end portions of the first sheet-like magnetic body 19a and the second sheet-like magnetic body 19b located on the center side of the antenna coil 2b partially overlap each other (overlap).
[0064]
As shown in FIG. 4, the first sheet-like magnetic body 19a, the second sheet-like magnetic body 19b, and the antenna coil 2 in which at least a part of the magnetic flux has significantly less magnetic resistance than in the air. b A flat and enlarged magnetic flux path (magnetic flux loop) φ as shown by a broken line is formed. FIG. 4 shows a magnetic flux path (magnetic flux loop) φ when the battery mounting portion 11c is made of resin.
[0065]
5 omits the protective case 20 made of resin or the like in FIG. 4, and the data carrier 1b and the first and second sheet-like magnets. body In this example, 19a and 19b are arranged parallel to the bottom or back surface of the battery mounting portion 11c and fixed by an adhesive or the like.
[0066]
4 and 5 also, when the lower case 11b of the mobile phone 11 is conductive, when the printed circuit board 13 is close to the battery mounting portion 11c, or when the metal battery unit 12 is mounted. The first and second sheet-like magnetism body If the extending direction of 19a and 19b is arranged in the short direction of the mobile phone 11, it is possible to easily communicate by increasing the communication directivity and communication distance by using the magnetic flux leakage path in the direction where the width of the device is narrow. .
[0067]
4 and 5, the first sheet-like magnetic body 19a is extended from one side of the antenna coil 2b to the outside, and the second sheet-like magnetic body 19b is further extended from the opposite surface to the outside in the opposite direction. The first and second sheet-like magnetic bodies 19a and 19b extend to form a continuous magnetic flux path φ passing through the antenna coil 2b.
[0068]
In the case of the disk-shaped antenna coil 2b, a magnetic flux generation site exists in the vicinity of the center between the diameter center of the antenna coil 2b and the inner periphery of the antenna coil 2b, and the magnetic flux passes through the magnetic flux generation site and passes through the antenna coil. 2b A relatively high density loop is formed around the lead wire.
[0069]
The magnetic flux generation site is not a point, but exists as a relatively narrow region centered on the center of the diameter of the antenna coil 2b and the middle point of the inner peripheral portion of the antenna coil 2b. Therefore, when it is desired to increase the directivity outside the specific surface direction (radial direction) in the disk-shaped antenna coil 2b, the first and second elements having high permeability in the surface direction from which the magnetic flux is generated to the directivity. Sheet magnetism body 19a and 19b are extended and arranged.
[0070]
Then, a considerable part of the magnetic flux from the magnetic flux generation site is a high permeability first and second sheet-like magnetism. body 19a and 19b are guided in the surface direction (radial direction), and as a result, the communicable magnetic flux region on the outer side in the surface direction is expanded. Since the magnetic flux has a spreading characteristic, a magnetic flux region that can be three-dimensionally communicated is expanded around the extended outer side in the plane direction.
[0071]
On the other hand, the first and second sheet-like magnets are simultaneously formed in the antenna coil 2b, for example, in the direction toward the radial center of the antenna coil 2b from the magnetic flux generation site. body When 19a and 19b are extended, the communicable magnetic flux region tends to gradually decrease in proportion to the extension distance, and when extending to the radial center of the antenna coil 2b, the first and second sheet-like magnetism body It has been experimentally found that the number decreases compared with the case where 19a and 19b are not arranged.
[0072]
The first and second sheet-like magnets are provided on both sides of the disk-shaped antenna coil 2b in the surface direction. body When 19a and 19b are extended, the first and second sheet-like magnetism body Since the effects of 19a and 19b are canceled out, it is not preferable.
[0073]
Accordingly, the first and second sheet-like magnets disposed on the disc-shaped antenna coil 2b. body It is preferable that 19a and 19b extend to one of the outer sides in the plane direction than the magnetic flux generating portion, and at the same time, the antenna coil 2b When extending inwardly in the radial center direction, it should be kept at a relatively small distance.
[0074]
Further, the data carrier 1b can be efficiently fixed even in a narrow space by attaching the antenna coil surface of the antenna coil 2b to the battery mounting portion 11c in parallel with the bottom or back surface of the battery mounting portion 11c. .
[0075]
The direction of the magnetic flux used for transmission / reception is a direction perpendicular to the antenna coil surface of the antenna coil 2b, but the magnetic flux 19a, 19b induces the magnetic flux in a direction parallel to the antenna coil surface to communicate in that direction. Since the directivity can be increased and the magnetic flux leaking through the magnetic flux leakage path formed on the extension can be increased, transmission / reception can be performed with high communication sensitivity.
[0076]
The concept of the magnetic flux leakage path when the upper and lower cases 11a, 11b are non-conductive or conductive is the same as that of the data carrier 1a having the cylindrical antenna coil 2a.
[0077]
FIG. 6 shows an example in which a sheet-like magnetic body 19 having a high relative permeability extending outward from the magnetic flux generating portion formed in the disk-shaped antenna coil 2b is arranged on one side of the antenna coil 2b. in this case 4 is substantially the same as the configuration described above with reference to FIG. 4. The case where the lower case 11 b of the mobile phone 11 is conductive, the case where the printed circuit board 13 is brought close to the battery mounting portion 11 c, and the case where the metal battery unit 12 is provided. When attached, sheet magnetic body If the 19 extending directions are arranged in the short direction of the mobile phone 11, communication can be easily performed by increasing the communication directivity and communication distance using the magnetic flux leakage path in the direction in which the width of the device is narrow.
[0078]
【The invention's effect】
Since the present invention has the configuration and operation as described above, a data carrier is mounted in the case of the portable device, the direction of the magnetic flux used by the data carrier for transmission and reception, and the magnetic flux leakage formed in the case of the portable device. By effectively using the path, it is possible to provide a portable device that reliably ensures a magnetic flux level that can be transmitted and received and enables communication of large-capacity unique information.
[0079]
Also ,Circle A first sheet-like magnetic body having a high relative permeability is extended from one side of the disk-shaped antenna coil, and a second sheet-like magnetic body having a high relative permeability is extended in the opposite direction from the other side. The second sheet-like magnetic body forms a continuous magnetic flux path that passes through the disk-shaped antenna coil, and the magnetic flux leaks outside the case of the portable device on the extension of the first and second sheet-like magnetic bodies. By forming the path, even if the conductive member is densely present inside the case of the portable device, the unique information recorded on the data carrier can be reliably transmitted to an external reader device or the like by non-contact with electromagnetic waves. I can do it. Further, by providing a sheet-like magnetic body having a high relative permeability, communication directivity can be improved, and the communication distance in that direction can be increased.
[0080]
Therefore, a large amount of unique information can be attached to the inside of a portable device having an extremely small volume, and online computer management can be performed stably. It is particularly effective for miniaturized portable devices.
[0081]
Further, when the portable device case is conductive and divided, and the magnetic flux leakage path is formed in the divided portion of the portable device case, the portable device case has conductivity. Even so, it is possible to reliably communicate with the outside.
[0082]
In addition, when a data carrier having a disk-shaped antenna coil is fixed to the bottom or back surface of the battery mounting portion where the battery unit is detachably mounted, the data carrier can be stabilized by effectively using the usable space. And can be fixed.
[0083]
When the portable device is a mobile phone, the present invention is extremely miniaturized, and the effect is further enhanced by applying it to a mobile phone in which conductive members are tightly accommodated. In addition, the number of mobile phones used is rapidly increasing due to their convenience, which is advantageous when performing production management, distribution management, recycling management, and the like.
[0084]
In addition, as a portable device, a portable information terminal (PDA) and the like can be configured in the same manner in addition to the cellular phone, and the same effect can be obtained.
[Brief description of the drawings]
FIG. 1 is an exploded view showing a configuration of a portable device according to the present invention, and shows a state where data carriers are provided in upper and lower cases, respectively.
FIGS. 2A and 2B are a side view and a front view showing a state in which a data carrier having a cylindrical antenna coil is attached by a holding member provided on the inner surface side of a case of a portable device; ) Is a front view showing a state in which a data carrier having a cylindrical antenna coil is attached using a hole provided in a thick portion such as a corner portion of a case of a portable device.
FIG. 3 is a diagram showing a data carrier having a cylindrical antenna coil, in which a sheet-like magnetic body having a high relative permeability extending outward from a magnetic flux generation site formed on the antenna coil is arranged on one side of the antenna coil. It is side sectional explanatory drawing which shows a mode that it attached to the inner surface side of the case of a type | mold apparatus.
FIG. 4 shows a data carrier having a disk-shaped antenna coil, in which a first sheet-like magnetic body having a high relative permeability is extended from one side of the antenna coil and a second sheet-like shape having a high relative permeability is formed from the other side. It is side sectional explanatory drawing which shows a mode that the magnetic body was extended and arrange | positioned in the reverse direction and it attached to the bottom face side of the battery unit mounting part of the case of a portable apparatus.
FIG. 5 shows a data carrier having a disk-shaped antenna coil, in which a first sheet-like magnetic body having a high relative permeability is extended from one side of the antenna coil and a second sheet-like shape having a high relative permeability is formed from the other side. It is plane explanatory drawing which shows a mode that the magnetic body was extended and arrange | positioned in the reverse direction and it attached to the bottom face side of the battery unit mounting part of the case of a portable apparatus.
FIG. 6 shows a data carrier having a disk-shaped antenna coil, and a sheet-like magnetic body having a high relative permeability extending outward from a magnetic flux generation site formed on the antenna coil is disposed on one side of the antenna coil. It is side sectional explanatory drawing which shows a mode that it attached to the back surface side of the battery unit mounting part of the case of a type | mold apparatus.
7A is a diagram showing a configuration of a data carrier having a cylindrical antenna coil, and FIG. 7B is a diagram showing a configuration of a data carrier having a disk-shaped antenna coil.
FIG. 8 is a block diagram showing a configuration of a data carrier control circuit.
FIG. 9 is a diagram showing a magnetic field component generated from a data carrier having a cylindrical antenna coil.
FIG. 10 is a diagram illustrating a magnetic field component generated from a data carrier having a disk-shaped antenna coil.
[Explanation of symbols]
1a, 1b ... data carrier
2a, 2b ... Antenna coil
3 ... IC circuit
4. Transmission / reception circuit
5 ... CPU
6 ... Memory
7 ... Capacitor
8 ... Glass container
9 ... Sealed container
10 ... Core
11… Mobile phone
11a ... Upper case
11b ... Lower case
11c ... Battery mounting part
11d ... Thick part
11e ... Insertion hole
12 ... Battery unit
13 ... Printed circuit board
14 ... Key
15 ... lid
16 ... antenna
17 ... Fixing member
18… Adhesive
19, 19a, 19b ... sheet-like magnetic material
20… Protective case
H ... Magnetic field component
φ ... Magnetic flux path

Claims (4)

A portable device having an antenna coil and a control circuit, and a data carrier that transmits and receives electromagnetic waves, fixed in the case,
The antenna coil has a disk shape, and the antenna coil surface is fixed in parallel with the case surface of the portable device, and the first sheet-like magnetic body having a high relative permeability is extended from one surface of the antenna coil. The second sheet-like magnetic body having a high relative permeability is extended in the opposite direction from the other surface, and the first and second sheet-like magnetic bodies form a continuous magnetic flux path through the antenna coil, and A portable device characterized in that a magnetic flux leakage path outside the case of the portable device is formed on the extension of the first and second sheet-like magnetic bodies. 2. The portable device according to claim 1, wherein the case of the portable device has conductivity and is of a divided type, and a magnetic flux leakage path is formed in a divided portion of the case of the portable device. The portable device according to claim 1 or 2 , wherein the data carrier is fixed to a bottom surface or a back surface of a battery mounting portion on which a battery unit is detachably mounted. The portable device according to any one of claims 1 to 3, wherein the portable device is a mobile phone.

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