JP2019121849A - Mobile wireless communication apparatus and information identification device using the same - Google Patents

Abstract

To provide a mobile wireless communication apparatus with less quality variations, which can be produced in low cost and high-volume.SOLUTION: A mobile wireless communication apparatus includes: an insulation base material; a coil antenna arranged in a loop state in the insulation base material; and an IC chip electrically connected to the coil antenna. The coil antenna includes a plurality of penetration electrodes which is arranged on a first surface side of the insulation base material, arranged in a plurality of first electrodes having a first part and a second part, and a plurality of second electrodes having a third part and a fourth part, while being arranged in a second surface side of the insulation base material, and arranged in the insulation base material. The first part of one of the first electrode of the plurality of first electrodes is connected to the fourth part of one second electrode of the plurality of second electrodes by using one penetration electrode of the plurality of penetration electrodes, and the second part of one first electrode of the plurality of first electrodes is connected to the third part of the other one second electrode of the plurality of second electrodes by using the other one penetration electrode of the plurality of penetration electrodes.SELECTED DRAWING: Figure 1

Description

  One embodiment of the present invention relates to a portable wireless communication device and an information identification apparatus using the portable wireless communication device.

  In recent years, an information transmission method using non-contact short distance communication technology has dramatically spread and has been used in various fields. In the noncontact short distance communication, a portable wireless communication device having a semiconductor element on which an integrated circuit is mounted and an antenna as a basic structure is used. Power is induced in the antenna by electromagnetic induction by a reader / writer or radio waves, which drives an integrated circuit (IC) chip that includes various elements that do not have a power supply. The IC chip performs various processes such as reading information embedded in the IC chip, writing information in the IC chip, generating and transmitting an instruction, and receiving an instruction from a reader / writer. Such a wireless communication device is generally called RFID (Radio Frequency Identification), but various names are given according to its shape and application. For example, it is also called an IC tag, a wireless tag, an RF tag, an IC card or the like.

  Due to the variety of stored information and the excellent portability of the wireless communication device itself, wireless communication devices are widely used as a means of product management, personal identification, security measures, electronic tickets, game cards, commerce decisions, etc. It's being used.

  In the case of an IC tag, reading may be performed by a reader / writer in a state where a plurality of IC tags are overlapped. At this time, when the respective IC tags interfere with each other, the resonance frequency which maximizes the electromotive force applied to the IC tag may fluctuate. In order to suppress the fluctuation of the resonant frequency, for example, Patent Document 1 discloses that a non-contact information medium is provided with a chip coil. Further, Patent Document 2 discloses that a plurality of coils smaller than the main antenna are provided without using a chip coil.

JP, 2006-67479, A JP, 2009-147560, A

  On the other hand, in the case of Patent Document 1, the need to provide a chip coil may cause variations in the quality of the coil or may increase the manufacturing cost of the IC tag. Further, in the case of Patent Document 2, it is difficult to increase the manufacturing tact of the antenna, so it is necessary to provide many manufacturing devices.

  In view of the above problems, an embodiment of the present invention has an object to provide a portable wireless communication device with less variation in quality, which can be mass-produced inexpensively.

  According to one embodiment of the present invention, an insulating substrate having a first surface and a second surface opposite to the first surface, a coil antenna disposed in a loop on the insulating substrate, and a coil antenna An electrically connected IC chip, wherein the coil antenna is disposed on the first surface side of the insulating substrate, and a plurality of first electrodes having a first portion and a second portion, the insulating substrate A plurality of second electrodes disposed on the second surface side and having a third portion and a fourth portion, and a plurality of through electrodes disposed in the insulating substrate, the first of the plurality of first electrodes The first portion of one electrode is connected to the fourth portion of one second electrode of the plurality of second electrodes using one of the plurality of through electrodes, and one of the plurality of first electrodes is selected. The second portion of the first electrodes of one of the plurality of first electrodes uses one other of the plurality of through electrodes and Of the electrodes is connected to the third portion of the other one of the second electrode, the portable radio communication device is provided.

  In the portable wireless communication device, at least one of the plurality of first electrodes and the plurality of second electrodes may have a serpentine shape.

  According to one embodiment of the present invention, there is provided a portable type including a coil antenna arranged in a loop and an IC chip electrically connected to the coil antenna, the coil antenna having a helical shape in a circumferential direction. A wireless communication device is provided.

  In the portable wireless communication device, the coil antenna includes a looped first antenna and a looped second antenna disposed inside the first antenna in plan view, and the first antenna and the second antenna May be connected in part.

  In the portable wireless communication device, the coil antenna includes a loop-shaped first antenna and a loop-shaped second antenna disposed to overlap the first antenna, and the first antenna and the second antenna are one. It may be connected in a part.

  According to one embodiment of the present invention, an insulating substrate having a first surface and a second surface opposite to the first surface, a coil antenna disposed in a loop on the insulating substrate, and a coil antenna An electrically connected IC chip, wherein the coil antenna is disposed on the first surface or the second surface of the insulating substrate and disposed on the plurality of insulating layers, the plurality of electrodes, and the plurality of insulating layers There is provided a portable wireless communication device including a plurality of through electrodes connecting each of a plurality of electrodes, and having a spiral shape in a cross sectional view.

  The portable wireless communication device may include a shield disposed so as to overlap with the coil antenna.

  In the portable wireless communication device, the coil antenna may have a circular shape in plan view.

  In the portable wireless communication device, the coil antenna may have a rectangular shape in plan view.

  According to one embodiment of the present invention, there is provided an information identification device including one or more of the above-described portable wireless communication devices and a reader / writer.

  According to one embodiment of the present invention, it is possible to provide a portable wireless communication device which can be mass-produced inexpensively and with less variation in quality.

It is a perspective view of the information identification device of one embodiment of the present invention. FIG. 1A is a top view and a cross-sectional view of a portable wireless communication device according to an embodiment of the present invention. It is a perspective view of the antenna part of the portable radio | wireless communication apparatus of one Embodiment of this invention. FIG. 1 is a block diagram of a portable wireless communication device and a reader / writer according to an embodiment of the present invention. It is sectional drawing which shows the drive state of the portable wireless communication apparatus of one Embodiment of this invention, and a reader / writer. It is a schematic diagram which shows the magnetic force line in the portable radio | wireless communication apparatus of one Embodiment of this invention. It is sectional drawing which shows the drive state of the portable wireless communication apparatus of one Embodiment of this invention, and a reader / writer. It is a perspective view which shows the manufacturing method of the antenna part of the portable wireless communication apparatus of one Embodiment of this invention. It is a perspective view which shows the manufacturing method of the antenna part of the portable wireless communication apparatus of one Embodiment of this invention. It is a perspective view which shows the manufacturing method of the antenna part of the portable wireless communication apparatus of one Embodiment of this invention. It is a perspective view which shows the manufacturing method of the antenna part of the portable wireless communication apparatus of one Embodiment of this invention. FIG. 1 is a top view of a portable wireless communication device according to an embodiment of the present invention. FIG. 1 is a top view of a portable wireless communication device according to an embodiment of the present invention. FIG. 1A is a top view and a cross-sectional view of a portable wireless communication device according to an embodiment of the present invention. FIG. 1 is a perspective view of a portable wireless communication device according to an embodiment of the present invention. It is sectional drawing of the antenna part of the portable wireless communication apparatus of one Embodiment of this invention. It is a specific example of the portable radio | wireless communication apparatus of one Embodiment of this invention. FIG. 1 is a top view of a portable wireless communication device according to an embodiment of the present invention. It is a top view of a portable wireless communication device of one embodiment of the present invention, and a top view of a shield. FIG. 1 is a cross-sectional view of a portable wireless communication device according to an embodiment of the present invention. It is sectional drawing which shows the drive state of the portable wireless communication apparatus of one Embodiment of this invention, and a reader / writer. FIG. 1 is a top view of a portable wireless communication device according to an embodiment of the present invention. It is sectional drawing which shows the drive state of the conventional portable wireless communication apparatus and reader / writer.

  Hereinafter, embodiments of the invention disclosed in the present application will be described with reference to the drawings. However, the present invention can be implemented in various forms without departing from the scope of the present invention, and the present invention is not interpreted as being limited to the description of the embodiments exemplified below.

  In the drawings referred to in this embodiment, the same portions or portions having similar functions are denoted by the same reference numerals or similar reference numerals (reference numerals with only -1, -2, etc. appended after numbers), The repeated description may be omitted. Further, the dimensional ratio of the drawings may be different from the actual ratio for convenience of explanation, or part of the configuration may be omitted from the drawings.

  Furthermore, in the detailed description of the present invention, when defining the positional relationship between a certain component and another component, the terms “above” and “below” are only when positioned directly above or below a certain component. However, unless otherwise specified, the case of further intervening other components is included.

  Moreover, in this specification, the words "conductive layer", "electrode", and "wiring" have the same meaning, and can be replaced depending on the situation.

First Embodiment
Hereinafter, a portable wireless communication device (hereinafter referred to as an IC tag) and an information identification device including the IC tag according to an embodiment of the present invention will be described.

  FIG. 1 is a schematic view of the information identification device 10. The information identification device 10 includes an IC tag 100 and a reader / writer 300.

(1-1. Configuration of IC tag)
As shown in FIG. 1, the IC tag 100 includes an IC chip 110, a coil antenna 130, a support portion 140, and a base material 145. The IC chip 110 and the coil antenna 130 are provided on the base 145. The IC chip 110 and the coil antenna 130 are electrically connected in part.

  The IC chip 110 is configured to generate a signal in accordance with an instruction from a reader / writer 300 (described later). The signal is transmitted to reader / writer 300 by coil antenna 130.

  The support portion 140 has a function of supporting the IC chip 110, the coil antenna 130, and the substrate 145. For the support portion 140, a material such as polyethylene terephthalate (PET), polyvinyl chloride (PVC), or paper is used. The thickness of the support portion 140 is not particularly limited, but can be appropriately selected from several hundred μm to several cm according to the purpose.

(1-2. Configuration of antenna unit)
FIG. 2 is a top view of the IC tag 100 and a cross-sectional view of the coil antenna 130 between A1 and A2. FIG. 3 is a perspective view of the coil antenna 130. As shown in FIG. The coil antenna 130 is an electromagnetic induction antenna and is arranged in a loop. The coil antenna 130 has a circular shape in plan view. An electromotive force (voltage) having a magnitude corresponding to a change in magnetic flux density passing through the area surrounded by the coil antenna 130 is generated in the coil antenna 130. The electromotive force is applied to the IC chip 110 electrically connected to the coil antenna 130, and the IC chip 110 is driven. The coil antenna 130 is configured to resonate in a frequency band of, for example, a short wave (HF) or an ultra high frequency (UHF). Specifically, the short wave corresponds to the 13.56 MHz frequency band. Moreover, the ultra high frequency corresponds to the frequency band of 860 to 960 MHz.

  As shown in FIGS. 2B and 3, the coil antenna includes an electrode 133, an electrode 137, and a through electrode 135. The electrode 133 and the electrode 137 are electrically connected via the through electrode 135. The electrode 133 may be referred to as a first electrode, and the electrode 137 may be referred to as a second electrode.

  The substrate 145 is a plate-like member having a first surface 145A and a second surface 145B. For the substrate 145, a high-resistance insulating material is used. For example, a glass epoxy resin substrate is used as the base material 145. In addition, the base material 145 is not limited to glass epoxy resin, and resin materials such as acrylic resin and polyethylene terephthalate resin may be used, and paper phenol resin in which a paper base material is made to contain phenol resin and hardened A substrate may be used.

The base 145 is a quartz glass substrate, a soda glass substrate, a borosilicate glass substrate, an alkali-free glass substrate, a sapphire substrate, a silicon substrate, a silicon carbide substrate, an alumina (Al ₂ O ₃ ) substrate, an aluminum nitride (AlN) substrate Inorganic materials such as zirconia (ZrO ₂ ) substrates may be used.

  A plurality of electrodes 133 are disposed on the upper surface (first surface 145A) side of the base material 145. For example, copper is used for the electrode 133.

  The electrode 133 is not limited to copper, and a material with low resistivity, such as aluminum, silver, or gold may be used. In addition, the electrode 133 may include a conductor having magnetism such as iron, nickel, cobalt, or ferrite. The magnetic conductor may be a single element or an alloy. In addition, the electrode 133 may contain boron in a magnetic conductor. The electrode 133 is not limited to a magnetic material, and may be a shape memory alloy such as a titanium-nickel alloy, or stainless steel.

  A plurality of electrodes 137 are disposed on the lower surface (second surface 145 B) side of the base 145. For the electrode 137, the same material as the electrode 133 is used.

  A plurality of through electrodes 135 are provided on the base 145. Copper is used for the through electrode 135. The through electrode 135 is not limited to copper, and a material containing gold, silver, copper, nickel or tin may be used.

  As shown in FIG. 2A, FIG. 2B, and FIG. 3, each of the plurality of electrodes 133 is radially arranged. Each of the plurality of electrodes 137 is disposed to be inclined at a predetermined angle with respect to the direction in which the electrodes 133 are disposed. The electrode 133 has a portion 133A at one end and a portion 133B at the other end. Similarly, the second electrode 137 has a portion 137A at one end and 137B at the other end. At this time, the portion 133A of the electrode 133 is connected to the portion 137B of the electrode 137-1 of the plurality of electrodes 137 using the through electrode 135-1 of the plurality of through electrodes 135. Similarly, the portion 133 </ b> B of the electrode 133 is connected to the portion 137 </ b> A of the electrode 137-2 of the plurality of electrodes 137 using the through electrode 135-2 of the plurality of through electrodes 135. The above connection is repeated for the other electrode 133, the other through electrode 135, and the other electrode 137. Thus, the coil antenna 130 is configured as one connected wire. (Specifically, it is structured as a one-stroke writing). At this time, it can be said that the coil antenna 130 has a helical shape as a whole.

(1-3. Configuration of IC chip)
Next, FIG. 4A shows a configuration example of the IC chip 110. As shown in FIG.

  The IC chip 110 can mainly include a voltage limit circuit 111, a rectifier circuit 113, a demodulation circuit 115, a modulation circuit 117, a control circuit 119, a storage portion 121, a resistor 123, and the like. Furthermore, the IC chip 110 may include a capacitance for resonance frequency adjustment.

  The voltage limit circuit 111 has a function of protecting the IC chip 110 from a voltage input when an excessive voltage is induced in the coil antenna 130. When an excessive voltage is induced, an unnecessary portion of the generated current is converted to heat using the resistor 123 and released to the outside.

  The rectifier circuit 113 has a function of converting alternating current induced in the coil antenna 130 into direct current. The power supply voltage that has become direct current by the rectifier circuit 113 is supplied to all the circuits that make up the IC tag 100.

  The demodulation circuit 115 has a function of converting the information (signal) superimposed on the carrier wave input from the reader / writer 300 into a 1 or 0 signal sequence.

  The control circuit 119 has a function of controlling transmission / reception between the reader / writer 300, interpreting an instruction, reading information from the storage unit 121, writing to the storage unit 121, and the like. The control circuit 119 is composed of various logic circuits. For the control circuit 119, a CPU (Central Processing Unit) or the like may be used.

  Further, the control circuit 119 generates a response to the command received from the reader / writer 300 and sends this data to the modulation circuit 117. The modulation circuit 117 modulates the carrier wave based on the data to be transmitted to generate a signal for transmission. The generated signal is transmitted from coil antenna 130 as a carrier wave.

  The storage unit 121 includes a memory device for storing data. The storage unit 121 stores unique information and various rewritable information.

(1-4. Configuration of reader / writer)
FIG. 4B shows a configuration example of the reader / writer 300. As shown in FIG. The reader / writer 300 includes a control circuit 310, a storage unit 313, a modulation circuit 320, a transmission circuit 330, an antenna 340, a reception circuit 350, a demodulation circuit 360, an oscillation circuit 370, and the like.

  The control circuit 310 controls the entire reader / writer 300, interprets received data and commands, writes data to the storage unit 313, reads data from the storage unit 313, and responds to the received instruction. And so on.

  The modulation circuit 320 superimposes and modulates the instruction and data sent from the control circuit 310 on the carrier wave generated by the oscillation circuit 370. The modulated carrier wave is sent to the transmission circuit 330, which amplifies the signal, attenuates unnecessary frequencies, etc., and takes out only the frequency to be transmitted. The signal thus processed is transmitted to the IC tag 100 via the antenna 340.

  The receiving circuit 350 has a function of receiving a carrier wave transmitted from the IC tag 100 received by the antenna 340. The receiver circuit 350 removes noise contained in the carrier wave and amplifies the necessary signal. The amplified signal is sent to the demodulation circuit 360 and demodulated into necessary instructions and data.

  The oscillator circuit 370 has a function of generating a carrier wave necessary for communication. For example, a high frequency of 13.56 MHz is generated as a carrier wave.

(1-5. Operation of Information Identification Device 10)
Next, the operation of the information identification device 10 will be described. FIG. 5 is a cross-sectional view for explaining the information identification method of the IC tag 100 when the reader / writer 300 is driven.

  As shown in FIG. 5, first, the reader / writer 300 is driven. When the reader / writer 300 is driven, the carrier wave 380 is sent from the reader / writer 300 to the coil antenna 130 of the IC tag 100. At this time, magnetic lines of force M130 are generated inside the ring of the coil antenna 130. The magnetic lines of force M130 cause electromagnetic induction and an induced electromotive force is supplied to the IC chip 110. As a result, the IC chip 110 is activated and transmission / reception with the reader / writer 300 becomes possible.

  At this time, since a current flows in the coil antenna 130, magnetic lines of force M131 are generated. FIG. 6 is a schematic view showing magnetic lines of force in the coil antenna 130. As shown in FIG. In FIG. 6, the coil antenna 130 has the above-described shape, so that the generated magnetic field lines M131 remain inside the coil antenna 130.

  FIG. 7 is a cross-sectional view for explaining the information identification method of the IC tag 100 when the reader / writer 300 is driven in a state where a plurality of IC tags 100 are stacked. As a comparative example, FIG. 23 shows an example in which a conventional general IC tag 99 is overlapped. As shown in FIG. 23, when the general IC tag 99 is overlapped, mutual interference occurs due to the magnetic field M 99 generated from the IC tag 99 (specifically, the mutual inductance changes), so the resonance frequency changes. There is a case. In this case, the IC tag 99 may not be able to read the information of the IC tag 99 without generating an electromotive force.

  On the other hand, in the case of the present embodiment, as shown in FIG. 6, even when the other IC tag 100 is disposed overlapping on one IC tag by the magnetic force M131 remaining inside the coil antenna. And mutual interference can be suppressed. As a result, the change in the resonant frequency of the IC tag 100 is suppressed, and even when a plurality of IC tags 100 are stacked, reading of the IC tag 100 becomes possible.

(1-6. Manufacturing method of coil antenna)
Next, a method of manufacturing the coil antenna 130 will be described with reference to FIGS.

  First, as shown in FIG. 8, the through holes 147 are formed in the base material 145.

  For the substrate 145, a high resistance material is used. For example, a resin material such as glass and epoxy resin is used for the base material 145.

  The through holes 147 are formed on the base 145 by mechanical processing using a drill or the like. The diameter of the through hole 147 is not particularly limited, but is appropriately set in the range of 10 μm to 1000 μm.

  The through holes 147 may be formed by a laser irradiation method (which can be called a laser ablation method). As the laser, an excimer laser, a neodymium: Yag laser (Nd: YAG) or the like is used. For example, when using xenon chloride in an excimer laser, light with a wavelength of 308 nm is emitted. The through holes 147 may be formed by photolithography and etching when a silicon substrate or a glass substrate is used.

  Next, as shown in FIG. 9, the through electrode 135 is formed in the through hole 147. Copper is used for the through electrode 135. The through electrode 135 may be formed by electrolytic plating or electroless plating. For example, when forming the through electrode 135 using copper, a copper thin film is formed on the side wall of the through hole 147 by sputtering. Next, using a copper thin film as a seed layer, a copper film is formed by electrolytic plating. Finally, the copper film formed on the first surface 145A and the second surface 145B of the base material 145 is formed on the first surface 145A and the second surface 145B of the base material 145 by chemical mechanical polishing (CMP). The through electrode 135 is filled and formed by removing copper.

  Next, as shown in FIG. 10, the electrode 133 is formed on the first surface 145A side of the base material 145. Copper is used for the electrode 133. The electrode 133 is formed by plating, for example. When the electrode 133 is formed by plating, for example, the following method may be used. First, a copper thin film (seed layer) is formed by sputtering. Next, after forming a resist film on the seed layer, the resist film is processed into a predetermined shape by photolithography or the like. Next, an electrode 133 is formed on the exposed seed layer. A copper film is formed on the electrode 133 by electrolytic plating. Finally, the resist film and the seed layer under the resist film are removed.

  The electrode 133 is not limited to the plating method, and may be formed by a printing method, sputtering, a CVD method, a coating method, or the like. At this time, the electrode 133 may be processed into a predetermined shape by a photolithography method and an etching method.

  Next, as shown in FIG. 11, the electrode 137 is formed on the second surface 145 B of the base material 145. The electrode 137 may be formed by the same material and method as the electrode 133.

  The coil antenna 130 is manufactured by the above method. By using this embodiment, it is possible to provide an IC tag that can be read even when a plurality of sheets are stacked without using a chip inductor. Moreover, by using this embodiment, since the chip inductor is not used, the variation in performance depending on the chip inductor can be suppressed, and an IC tag with excellent quality can be provided. In addition, since the plurality of first electrodes, the plurality of second electrodes, and the plurality of through electrodes are formed at one time by the above-described manufacturing method, it is possible to manufacture a coil antenna rather than manufacturing one by one using a winding machine or the like. Manufacturing tact can be improved. Moreover, in the case of this embodiment, it can manufacture using the existing installation. Therefore, it is not necessary to newly provide equipment as compared with a winding machine used for manufacturing a coil antenna. Also, the manufacturing equipment may not have a high function. That is, the coil antenna can be manufactured using a general electronic component manufacturing apparatus.

  Moreover, the coil antenna 130 can be controlled by the thickness of the base 145 by using the above manufacturing method. That is, the coil antenna 130 can be further reduced by reducing the thickness of the base 145. Therefore, by reducing the size of the coil antenna 130, the IC tag can be miniaturized and thinned.

Second Embodiment
In the present embodiment, a portable wireless communication apparatus having a coil antenna different in form from the first embodiment will be described.

  FIG. 12 is a top view of the IC tag 100-1. In FIG. 12, in order to make the electrode 133-1 of the coil antenna 130-1 of the IC tag 100-1 easier to see, the electrode 137 and the through electrode 135 are not shown, but are omitted in the first embodiment. As in the embodiment, the first electrode 133-1, the electrode 137, and the through electrode 135 are connected so as to form one wiring as a whole.

As shown in FIG. 12, the electrode 133-1 includes an electrode 133-1-1 disposed outside and an electrode 133-1-2 disposed inside. At this time, the coil antenna 130-1 is formed using a loop antenna (sometimes called a first antenna) formed using the electrode 133-1-1 and an electrode 133-1-2. And a loop antenna (sometimes referred to as a second antenna) disposed inside the first antenna in plan view. The first antenna and the second antenna are electrically connected in part. The coil antenna 130-1 can increase the number of turns as a whole of the coil antenna by including the electrode 133-1-1 and the electrode 133-1-2 disposed inside. At this time, the number N of turns of the coil, the magnetic flux 貫 penetrating the coil, and the time t have the relationship of Formula 1. That is, since the number of turns of the coil can be increased, the induced electromotive force generated in the coil antenna 130-1 can be increased. This leads to the IC tag 100-1 increasing the sensitivity to the reader / writer 300.

  FIG. 13 is a top view of the IC tag 100-2. In FIG. 13, in order to facilitate visual recognition of the electrode 133-2 of the coil antenna 130-2 of the IC tag 100-2, the electrode 137 and the through electrode 135 are not shown. As shown in FIG. 13, the electrode 133-2 has a serpentine shape. The electrode 137 may have a meandering shape as well. Thereby, the capacitance between the electrodes can be increased in at least one of the electrode 133-2 and the electrode 137.

At this time, the inductance value L and the capacitance value C required for a specific resonance frequency f (for example, 13.56 MHz) are in the relationship shown in Formula 2. Since the capacitance of the IC tag 100-2 can be increased based on Equation 2, the inductance value L can be lowered.

Furthermore, there is a relationship of Formula 3 among the inductance value L, the cross-sectional area S of the coil, the number of turns N of the coil antenna, and the length l of the coil. Based on the above, since the inductance value L can be reduced, the number of turns of the coil antenna 130-2 can be reduced. That is, the coil antenna can be formed more easily.

  As mentioned above, the manufacturing accuracy of a coil antenna can be lowered by using this embodiment. As a result, the IC tag including the above-mentioned coil antenna can be manufactured even if a manufacturing apparatus with low specification is used, and the manufacturing cost can be reduced.

Third Embodiment
In the present embodiment, a portable wireless communication apparatus including a coil antenna having a form different from the first embodiment and the second embodiment will be described.

  FIG. 14 is a top view of the IC tag 100-3 and a cross-sectional view of A1-A2 of the coil antenna 130-3. In FIG. 14A, the IC chip 110 is electrically connected to the coil antenna 130-3. The coil antenna 130-3 is arranged in a loop.

  As shown in FIG. 14B, in addition to the plurality of electrodes 133 on the first surface 145A of the base material 145, a plurality of electrodes 151 (electrodes 151-1) are provided between A1 and A2. , Electrode 151-2, electrode 151-3, electrode 151-4, electrode 151-5, electrode 151-6), and a plurality of insulating layers 153 (insulating layer 153-1, insulating layer 153-2, insulating layer 153-3) , Insulating layer 153-4, insulating layer 153-5, insulating layer 153-6), and a plurality of through electrodes 155 (through electrodes 155-1, through electrodes 155-2, through electrodes 155-3, through electrodes 155-4). , Through electrodes 155-5 and through electrodes 155-6).

  At this time, the electrode 151-1 is disposed on the first surface 145A of the base 145. The insulating layer 153-1 is disposed on the base material 145 and the electrode 151-1. The electrode 151-2 is disposed on the insulating layer 153-1. The insulating layer 153-2 is disposed on the insulating layer 153-1 and the electrode 151-2. The electrode 151-3 is disposed on the insulating layer 153-2. The insulating layer 153-3 is disposed on the insulating layer 153-2 and the electrode 151-3. The electrode 151-4 is disposed on the insulating layer 153-3. The insulating layer 153-4 is disposed on the insulating layer 153-3 and the electrode 151-4. The electrode 151-5 is disposed on the insulating layer 153-4. The insulating layer 153-5 is disposed on the insulating layer 153-4 and the electrode 151-5. The electrode 151-6 is disposed on the insulating layer 153-5. The insulating layer 153-6 is disposed on the insulating layer 153-5 and the electrode 151-6. The electrode 133 is disposed on the insulating layer 153-6.

  The plurality of through electrodes 155 connect each of the plurality of electrodes 151. Specifically, the through electrode 155-1 connects the electrode 151-3 and the electrode 151-4. The through electrode 155-2 connects the electrode 151-3 and the electrode 151-5. The through electrode 155-3 connects the electrode 151-2 and the electrode 151-5. The through electrode 155-4 connects the electrode 151-2 and the electrode 151-6. The through electrode 155-5 connects the electrode 151-1 and the electrode 151-6. The through electrode 155-6 connects the electrode 151-1 and the electrode 133 (corresponding to the portion 133 </ b> A in FIG. 3). At this time, the through electrodes 155-1 to 155-6 are disposed in at least one of the insulating layers 153-1 to 153-6. Further, as shown in FIG. 14A, the electrode 151-4 is connected to the electrode 133 (corresponding to the portion 133B in FIG. 3) by a through electrode (not shown).

  As shown in FIG. 14 (B), the coil antenna 130-3 has a spiral shape in a cross sectional view. By having this shape, the inductance can be increased in a small area.

Fourth Embodiment
In this embodiment, a portable wireless communication device including a coil antenna having a form different from the first to third embodiments will be described.

  FIG. 15 is a perspective view of the IC tag 100-4. FIG. 16 is a schematic cross-sectional view showing a part of the coil antenna 130-4 of the IC tag 100-4. As shown in FIGS. 15 and 16, the coil antenna 130-4 includes an antenna 130-4-1 and an antenna 130-4-2. The antenna 130-4-1 is disposed on the base material 145-4-1 and has a loop shape. The antenna 130-4-2 is disposed on the substrate 145-4-2 and has a loop shape. The antenna 130-4-1 and the antenna 130-4-2 are disposed to overlap with each other. An insulating layer 160 is disposed between the base 145-4-1 and the base 145-4-2. The material of the insulating layer 160 is not particularly limited, but an inorganic insulating material, an organic insulating material, or one containing an inorganic insulating material and an organic insulating material may be used. For example, for the insulating layer 160, a plastic molding material containing an epoxy resin on a fibrous glass base may be used. An adhesive may be provided between the base 145-1-1 and the base 145-4-2 and the insulating layer 160.

  The antenna 130-4-1 has a plurality of electrodes 133-4-1, a plurality of electrodes 137-4-1 and a plurality of through electrodes 135-4-1. The portion 133-4-1A of the electrode 133-4-1 is connected to the portion 137-4-1B of one electrode 137-4-1 via the one through electrode 135-4-1. The portion 133-4-1B of the electrode 133-4-1 is connected to the portion 137-4-1A of the other electrode 137-4-1 via the other through electrode 135-4-1 .

  Similarly, the antenna 130-4-2 has a plurality of electrodes 133-4-2, a plurality of electrodes 137-4-2 and a plurality of through electrodes 135-4-2. The portion 133-4-2A of the electrode 133-4-2 is connected to the portion 137-4-2B of one electrode 137-4-2 through the one through electrode 135-4-2. The portion 133-4-2B of the electrode 133-4-2 is connected to the portion 137-4-2A of the other electrode 137-4-2 via the other through electrode 135-4-2. .

  The electrode 133-4-3 disposed on the first surface 145-4-1A of the substrate 145-4-1 and the electrode 137- disposed on the second surface 145-4-2B of the substrate 145-4-2 4-3 are connected through the through electrodes 135-4-3. That is, the antenna 130-4-1 and the antenna 130-4-2 are partially connected.

  By having the above-described structure, two coil antennas shown in FIG. 1 and FIG. 3 are stacked to form one coil antenna. Thereby, since the number of turns can be increased as the whole coil antenna, the induced electromotive force can be increased. Furthermore, the outer diameter can be reduced while maintaining the aperture area of the coil antenna large. Therefore, the sensitivity of the coil antenna can be enhanced while reducing the shape of the IC tag.

  Hereinafter, specific examples in which the IC tag 100 described in the first to fourth embodiments is mounted will be described.

  FIG. 17 is a view for explaining a portable medium on which the IC tag 100 is mounted. The IC tag 100 is used, for example, in various situations such as product management, personal identification, security measures, electronic tickets, game cards, and commerce decisions. FIG. 17A is a schematic view of a coin 1000. FIG. FIG. 17B is a schematic view of the playing card 2000. FIG. 17C is a schematic view of an ID (Identification) card 3000.

  Information can be obtained even if a plurality of IC tags 100 are stacked in these media.

  The embodiments described above as the embodiments of the present invention can be implemented in combination as appropriate as long as they do not contradict each other. In addition, those to which a person skilled in the art appropriately adds, deletes, or changes the design of components based on each embodiment are also included in the scope of the present invention as long as the gist of the present invention is included.

  In addition, even if other functions and effects different from the functions and effects provided by the above-described embodiments are apparent from the description of the present specification or those that can be easily predicted by those skilled in the art, it is natural. It is understood that the present invention provides.

(Modification 1)
In addition, in 1st Embodiment of this invention, although IC tag which has circular shape in planar view was demonstrated, it is not limited to this. FIG. 18 is a top view of the IC tag 100-5. The IC tag 100-5 includes an IC chip 110, a coil antenna 130-5, and a base 145. The IC chip 110 and the coil antenna 130-5 are provided on the base 145. As shown in FIG. 18, the coil antenna 130-5 may have a rectangular shape in plan view.

(Modification 2)
In addition, the IC tag 100 may further have a shielding material. FIG. 19 is a top view of the IC tag 100-6 and a top view of the shield 180. FIG. 20 is a cross-sectional view of A1 to A2 of the IC tag 100-6. As shown in FIG. 19B, the shield 180 is annular, but has a notch. (Thus, it can be said that the shield 180 has a shape like C.) In FIG. 20, the IC tag 100-6 has the insulating layer 170 (insulating layer 170 on the first surface 145A side of the base 145). -1) and the shield 180 (shield 180-1). In addition, the IC tag 100-6 includes the insulating layer 170 (insulating layer 170-2) and the shield 180 (shield 180-2) on the second surface 145B side of the base 145. At this time, it can be said that the shield 180 is disposed so as to be superimposed on the coil antenna 130. The same material as the insulating layer 160 is used for the insulating layer 170 (the insulating layer 170-1 and the insulating layer 170-2). A magnetic material is used for the shield 180 (the shield 180-1 and the shield 180-2). Specifically, as the shield 180, a magnetic substance having magnetism such as iron (Fe), nickel (Ni), cobalt (Co), ferrite, etc. is used. The shield 180 is not limited to a magnetic material, and a conductor such as copper (Cu) or aluminum (Al) may be provided. In addition, the shielding body 180 may be arrange | positioned in either of the 1st surface 145A and the 2nd surface 145B.

  FIG. 21 is a cross-sectional view in the case where a plurality of IC tags 100-6 are stacked. In FIG. 21, the IC tag 100-6 has a shield 180, thereby shielding the magnetic field emitted by each coil antenna 130. Even when a plurality of sheets are stacked, mutual interference is prevented. Thus, even when a plurality of IC tags are stacked, information of the IC tag can be read stably.

(Modification 3)
In the first embodiment of the present invention, the through electrode is formed by plating, but is not limited thereto. For example, a wiring pattern is formed of a highly spreadable material such as aluminum on the first surface 145A and the second surface 145B of the base 145, and pressure is physically applied from both sides of the first surface 145A and the second surface 145B at the opening. The first electrode and the second electrode may be connected by providing a connection portion to be a through electrode by caulking (sometimes called caulking).

(Modification 4)
In the first to fourth embodiments of the present invention, the coil antenna having the upper electrode, the lower electrode, and the through electrode on the insulating substrate has been described, but the present invention is not limited to this. FIG. 22 is a top view of the IC tag 100-7. The IC tag 100-7 includes an IC chip 110, a coil antenna 130-7 and a support 149. The support 149 is used to support the form of the coil antenna 130-7, and may not necessarily be provided.

  In FIG. 22, the coil antenna 130-7 has a helical shape in the circumferential direction. The coil antenna 130-7 may be formed using a winding machine. Also in the IC tag 100-7, the magnetic field generated by the coil antenna 130-7 does not go outside, so even when a plurality of IC tags 100-7 are stacked, reading of the IC tag is possible.

  100 ... IC tag, 110 ... IC chip, 111 ... voltage limit circuit, 113 ... rectification circuit, 115 ... demodulation circuit, 117 ... modulation circuit, 119 ... control circuit, 121 ... memory unit, 123 ... resistance, 130 ... coil antenna, 133 ... electrode, 135 ... penetration electrode, 137 ... electrode, 140 ... support part, 145 ... Base material 149 ... support body 151 ... electrode ... 153 ... insulating layer, 155 ... penetrating electrode, 160 ... insulating layer, 170 ... insulating layer, 180 ... shield 300: reader / writer 310: control circuit 313: storage unit 320: modulation circuit 330: transmission circuit 340: antenna 350: reception circuit 360 ··· Demodulation circuit, 370 ··· Oscillator circuit 380 ... carrier, 1000 ... coin, 2000 ... playing cards, 3000 ··· ID (Identification) card

Claims (10)

An insulating substrate having a first surface and a second surface opposite to the first surface;
A coil antenna disposed in a loop on the insulating substrate;
An IC chip electrically connected to the coil antenna;
The coil antenna is disposed on the first surface side of the insulating substrate, and is disposed on a plurality of first electrodes having a first portion and a second portion, and on the second surface side of the insulating substrate. A plurality of second electrodes having a third portion and a fourth portion, and a plurality of through electrodes disposed in the insulating substrate,
The first portion of one first electrode of the plurality of first electrodes uses one through electrode among the plurality of through electrodes, and the first portion of one second electrode of the plurality of second electrodes. Connected with the fourth part,
The second portion of the one first electrode of the plurality of first electrodes uses another one of the plurality of through electrodes and uses the other one of the plurality of second electrodes. Connected to the third portion of the second electrode,
Portable wireless communication device. At least one of the plurality of first electrodes and the plurality of second electrodes has a serpentine shape,
The portable wireless communication device according to claim 1. A coil antenna arranged in a loop,
An IC chip electrically connected to the coil antenna;
The coil antenna has a helical shape in a circumferential direction,
Portable wireless communication device. The coil antenna includes a looped first antenna and a looped second antenna disposed inside the first antenna in plan view, and the first antenna and the second antenna are partially connected To be
The portable wireless communication device according to any one of claims 1 to 3. The coil antenna includes a looped first antenna and a looped second antenna disposed to overlap the first antenna, and the first antenna and the second antenna are partially connected The
The portable wireless communication device according to any one of claims 1 to 3. An insulating substrate having a first surface and a second surface opposite to the first surface;
A coil antenna disposed in a loop on the insulating substrate;
An IC chip electrically connected to the coil antenna;
The coil antenna is
A plurality of insulating layers, a plurality of electrodes, and a plurality of insulating layers disposed on the first surface or the second surface of the insulating substrate, and a plurality of electrodes connecting each of the plurality of electrodes Has a spiral shape in cross section, including a through electrode
Portable wireless communication device. Including a shield disposed superimposed on the coil antenna,
The portable wireless communication device according to any one of claims 1 to 6. The coil antenna has a circular shape in plan view.
The portable wireless communication device according to any one of claims 1 to 7. The coil antenna has a rectangular shape in plan view,
The portable wireless communication device according to any one of claims 1 to 7.   An information identification device comprising: at least one portable wireless communication device according to any one of claims 1 to 9; and a reader / writer.

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