Patent Grant
8400307
1. Field of the Invention
The present invention relates to radio frequency IC devices, and, more particularly, to a radio frequency IC device including a radio frequency IC chip used in an RFID (Radio Frequency Identification) system and an electronic apparatus including the radio frequency IC device.
2. Description of the Related Art
Recently, an RFID system has been developed as a product management system in which a reader/writer arranged to generate an induction field communicates with an IC chip (hereinafter also referred to as an IC tag or a radio frequency IC chip) attached to a product or a case in a non-contact manner so as to obtain predetermined information stored in the IC chip.
Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 11-515094 discloses an RFID tag including an IC chip mounted on the main surface of a printed circuit board and an antenna provided in the printed circuit board. In this RFID tag, the antenna and the IC chip are electrically connected to each other. The miniaturization of the RFID tag is achieved by providing the antenna in the printed circuit board.
However, the number of manufacturing processes required to produce the RFID tag is increased in order to prepare the dedicated antenna, and a space is required for the dedicated antenna. This leads to increases in the manufacturing cost and size of the RFID tag. As illustrated in FIG. 2 in Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 11-515094, the number of manufacturing processes is increased especially if an antenna having a meander shape is formed, since internal electrodes included in a plurality of layers must be processed. Furthermore, in order to achieve the impedance matching between the IC chip and the antenna, a matching section is required. If the matching section is disposed between the antenna and the IC chip, the size of the antenna is increased. Furthermore, if the IC chip is modified, the shape of the antenna must be changed.
To overcome the problems described above, preferred embodiments of the present invention provide a small radio frequency IC device capable of easily achieving impedance matching without using a dedicated antenna and an electronic apparatus including the radio frequency IC device.
A radio frequency IC device according to a first preferred embodiment of the present invention includes a radio frequency IC chip arranged to process a transmitted/received signal, a circuit board on which the radio frequency IC chip is mounted, an electrode arranged on the circuit board, and a loop electrode that is arranged on the circuit board so that the loop electrode is coupled to the radio frequency IC chip and the electrode.
A radio frequency IC device according to a second preferred embodiment of the present invention includes an electromagnetic coupling module including a radio frequency IC chip arranged to process a transmitted/received signal and a power supply circuit board that includes an inductance element coupled to the radio frequency IC chip, a circuit board on which the electromagnetic coupling module is mounted, an electrode arranged on the circuit board, and a loop electrode that is arranged on the circuit board so that the loop electrode is coupled to the power supply circuit board and the electrode.
In the radio frequency IC device according to the first preferred embodiment, a radio frequency IC chip or a power supply circuit board is preferably coupled to an electrode arranged at a circuit board, for example, a ground electrode via a loop electrode. The electrode arranged on the circuit board functions as a radiation plate (an antenna) for the radio frequency IC chip. That is, the electrode receives a signal, and the radio frequency IC chip receives the signal from the electrode via the loop electrode and is operated by the received signal. A response signal output from the radio frequency IC chip is transmitted to the electrode via the loop electrode, and is then emitted from the electrode to the outside. Accordingly, a dedicated antenna is not required, and a space is not required for the dedicated antenna. The loop electrode can perform the impedance matching between the radio frequency IC chip and the electrode. Accordingly, a matching section is not necessarily required. Therefore, the efficiency of signal transmission between the radio frequency IC chip and the electrode is improved.
In a radio frequency IC device according to the second preferred embodiment, a power supply circuit board is disposed between a radio frequency IC, for example, a radio frequency IC chip and a loop electrode. This power supply circuit board includes a resonance circuit including an inductance element and/or a matching circuit. A frequency to be used is set by the resonance circuit and/or the matching circuit. If the radio frequency IC chip is changed in accordance with a frequency used by an RFID system, only a change in design of the resonance circuit and/or the matching circuit is required. It is not necessary to change the shape, size, and/or location of a radiation plate (electrode) or the state of coupling between the loop electrode and the electrode or the power supply circuit board. The resonance circuit and/or the matching circuit can also function to achieve the impedance matching between the radio frequency IC chip and the electrode. Accordingly, the efficiency of signal transmission between the radio frequency IC chip and the electrode is improved.
In the radio frequency IC device, the loop electrode is preferably coupled to the radio frequency IC chip or the power supply circuit board may preferably include a plurality of layers included in a multilayer circuit board.
The radio frequency IC chip stores various pieces of information about a product to which the radio frequency IC device is attached, and, furthermore, may be a re-writable radio frequency IC chip. That is, the radio frequency IC chip may have an information processing function in addition to an RFID system function.
According to preferred embodiments of the present invention, an existing electrode included in a circuit board can preferably be used as an antenna. Since a dedicated antenna is not required, a radio frequency IC device and an apparatus including the radio frequency IC device can be miniaturized. A resonance circuit and/or a matching circuit included in a loop electrode and/or a power supply circuit board may have an impedance matching function. Accordingly, a matching section is not necessarily required.
Other features, elements, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the present invention with reference to the attached drawings.
A radio frequency IC device and an electronic apparatus according to preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same numerals are used for similar components and portions so as to avoid repeated explanation.
The radio frequency IC chip 5 includes a clock circuit, a logic circuit, and a memory circuit, and stores necessary information. As illustrated in
The loop electrode 22 is arranged near the edge of the ground electrode 21 in the horizontal direction, whereby the loop electrode 22 and the ground electrode 21 are coupled to each other by electric field coupling. That is, by arranging the loop electrode 22 near the ground electrode on the same surface, a loop magnetic field H (denoted by a dotted line in
The electromagnetic coupling between the loop electrode 22 and the ground electrode 21 enables a high-frequency signal received by the ground electrode 21 from a reader/writer to be transmitted to the radio frequency IC chip 5 via the loop electrode 22 so as to activate the radio frequency IC chip 5, and enables a response signal output from the radio frequency IC chip 5 to be transmitted to the ground electrode 21 via the loop electrode 22 and then be emitted from the ground electrode 21 toward the reader-writer.
The ground electrode 21 may preferably be defined by an existing component included in the printed circuit board 20 of an electronic apparatus containing the radio frequency IC device. Alternatively, a ground electrode used for another electronic component included in an electronic apparatus may be used as the ground electrode 21, for example. Accordingly, in this radio frequency IC device, a dedicated antenna is not required, and a space is not required for the antenna. Furthermore, since a large ground electrode 21 is used, a radiation characteristic is improved.
By controlling the length and width of the loop electrode 22 and the space between the loop electrode 22 and the ground electrode 21, the impedance matching between the radio frequency IC chip 5 and the ground electrode 21 can be achieved.
The ground electrode 21 and the loop electrode 22 are coupled in substantially the same manner as that described in the first preferred embodiment. The operational advantages of a radio frequency IC device according to the second preferred embodiment are substantially the same as those of a radio frequency IC device according to the first preferred embodiment. In this preferred embodiment, a large space for another electronic component can be obtained on the upper surface of the circuit board 20.
The loop electrode 25 is arranged near the ground electrode 21 in the vertical direction, and is coupled to the ground electrode 21 by electric field coupling. That is, a magnetic flux is generated from the loop electrode 25 near the surface on which the ground electrode 21 is arranged, and an electric field that intersects the magnetic field substantially at right angles is generated from the ground electrode 21. As a result, an electric field loop is excited on the ground electrode 21. The excited electric field loop generates a magnetic field loop. Thus, the electric field loop and the magnetic field loop are generated on substantially the entire surface of the ground electrode 21, such that a high-frequency signal is emitted. That is, by arranging the loop electrode 25 near the ground electrode 21 in the vertical direction while providing the electric isolation between the loop electrode 25 and the ground electrode 21, the flexibility in the placement of the loop electrode 25 can be increased.
The operation and operational advantages of a radio frequency IC device according to the third preferred embodiment are substantially the same as those of a radio frequency IC device according to the first preferred embodiment. In this preferred embodiment, since the loop electrode 25 is disposed in the printed circuit board 20, interference caused by the penetration of a magnetic field from the outside can be prevented. The ground electrode 21 may be formed in the printed circuit board 20. In this case, since a large space can be obtained on the main surface and the bottom surface of the printed circuit board 20, another line or another electronic component may be disposed thereon so as to increase the packing density.
In the fourth preferred embodiment, the loop electrode 31 is electrically coupled to the ground electrode 21. The radio frequency IC chip 5 is coupled to the ground electrode 21 via the loop electrode 31 arranged therebetween. The operation and operational advantages of a radio frequency IC device according to the fourth preferred embodiment are substantially the same as those of a radio frequency IC device according to the first preferred embodiment.
In the fifth preferred embodiment, the loop electrode 32 is electrically coupled to the ground electrode 21. The radio frequency IC chip 5 and the ground electrode 21 are coupled to each other via the loop electrode 32 disposed therebetween. The operation and operational advantages of a radio frequency IC device according to the fifth preferred embodiment are substantially the same as those of a radio frequency IC device according to the first preferred embodiment.
One of the input-output terminal electrodes 6 of the radio frequency IC chip 5, which are illustrated in
The power supply circuit board 10 includes a resonance circuit (not illustrated in
That is, the power supply circuit board 10 includes a resonance circuit having a predetermined resonance frequency so as to transmit a transmission signal of a predetermined frequency output from the radio frequency IC chip 5 to the ground electrode 21 via the outer electrodes 19a and 19b and the loop electrode 35, or select a received signal of a predetermined frequency from among signals received by the ground electrode 21 and supply the selected received signal to the radio frequency IC chip 5. Accordingly, in this radio frequency IC device, the radio frequency IC chip 5 is operated by a signal received by the ground electrode 21, and a response signal output from the radio frequency IC chip 5 is emitted from the ground electrode 21.
In the electromagnetic coupling module 1, the outer electrodes 19a and 19b provided on the bottom surface of the power supply circuit board 10 are coupled to the resonance circuit included in the power supply circuit board 10 by electromagnetic field coupling, and are electrically connected to the loop electrode 35 that is coupled to the ground electrode defining an antenna by electric field coupling. In this preferred embodiment, since a relatively large antenna element is not required as a separate component, the size of the electromagnetic coupling module 1 can be reduced. Furthermore, the size of the power supply circuit board 10 can be reduced. Accordingly, IC mounters that have been widely used can be used to mount the radio frequency IC chip 5 on the power supply circuit board 10. This reduces the cost of mounting. When a frequency band to be used is changed, only the design of the resonance circuit needs to be changed.
An inductance element alone may be used as an element provided in the power supply circuit board 10. The inductance element has a function of achieving the impedance matching between the radio frequency IC chip 5 and a radiation plate (the ground electrode 21).
Similar to the loop electrode described in the fourth preferred embodiment (see,
Referring to
The impedance (Z) between the connection electrodes 22a and 22b is represented by the sum of a real part and an imaginary part (X). As the size of the loop electrode 22 is reduced, the length of a current path is reduced. As the length of the current path is reduced, the resistance generated at the loop electrode 22 and the impedance (X=ωL) of an inductance (L) generated by a current passing through the path are reduced. If a space for the loop electrode 22 is reduced in accordance with the miniaturization of an apparatus, such as a mobile telephone, for example, the impedance of the loop electrode 22 is significantly reduced. This produces a large impedance difference between the loop electrode 22 and a radio frequency IC chip or a power supply (resonance/matching) circuit. Consequently, sufficient electric power cannot be supplied from the radio frequency IC chip 5 or the power supply circuit to a radiation plate.
In order to solve this problem, a higher impedance (Z) must be set for the loop electrode 22, that is, the real part or the imaginary part (X) must be increased. The eighth to thirteenth preferred embodiments solve such a problem. Accordingly, in the eighth preferred embodiment, the ground electrode 50A functions as an antenna and provides the same operational advantages as those described in the first preferred embodiment. Furthermore, in the eighth preferred embodiment, the size of the loop electrode 51A, which is provided on the first layer 41A and coupled to the radio frequency IC chip 5 or the power supply circuit board 10, is greater than that of the other loop electrodes, that is, the loop electrodes 51B to 51D. Accordingly, the length of a current path passing through the loop electrode 51A at the time of communication is increased, the resistance is increased, and the real part is increased. As a result, a higher impedance (Z) is obtained.
Similar to the above-described preferred embodiments, in the tenth preferred embodiment, the ground electrode 21 functions as an antenna, and provides substantially the same operational advantages as those described in the first preferred embodiment. The meandering matching electrode 37 disposed on the inner side of the loop electrode 31 increases the length of a current path flowing through the loop electrode 31. The resistance and the real part are therefore increased. As a result, the impedance (Z) is increased. The exemplary shape of the matching electrode 37 illustrated in
Similar to the tenth preferred embodiment, in this preferred embodiment, the connection electrodes 37a and 37b which are the ends of the matching electrode 37 are coupled to the radio frequency IC chip 5 or the power supply circuit board 10. The ground electrode 21 functions as an antenna, and provides the same operational advantages as those described in the first and tenth preferred embodiments.
The loop electrodes 51A to 51D are obtained by providing the cutouts 50a to 50d at the ground electrodes 50A to 50D provided on the layers 41A to 41D, respectively. Connection electrodes 55a and 55b provided on the first layer 41A are respectively electrically connected to the input-output terminal electrodes 6 of the radio frequency IC chip 5, or are electromagnetically coupled to the power supply circuit board 10 (the electromagnetic coupling module 1). The ground electrodes 50A to 50D may be electrically connected to each other through via-hole conductors. An electrode functioning as an antenna may not necessarily be a ground electrode.
Furthermore, matching electrodes 56a and 56b are disposed on the inner side of the loop electrode 51B, and matching electrodes 57a and 57b are disposed on the inner side of the loop electrode 51C. The connection electrode 55a is connected to one end of the matching electrode 57a through a via-hole conductor 58a, and the other end of the matching electrode 57a is connected to one end of the matching electrode 56a through a via-hole conductor 58b. The other end of the matching electrode 56a is connected to an end 50Aa of the ground electrode 50A through a via-hole conductor 58c. The connection electrode 55b is connected to one end of the matching electrode 57b through a via-hole conductor 58d, and the other end of the matching electrode 57b is connected to one end of a matching electrode 56b through a via-hole conductor 58e. The other end of the matching electrode 56b is connected to an end 50Ab of the ground electrode 50A through a via-hole conductor 58f.
Similar to the above-described preferred embodiments, in the twelfth preferred embodiment, the ground electrode 50A functions as an antenna, and provides the same operational advantages as those described in the first preferred embodiment. Furthermore, the length of a current path passing through the loop electrode 51A is increased by the matching electrodes 56a and 56b, which are disposed on the inner side of the loop electrode 51B, and the matching electrodes 57a and 57b, which are disposed on the inner side of the loop electrode 51C. The resistance and the real part are therefore increased. As a result, the impedance (Z) can be increased. In the twelfth preferred embodiment, since the matching electrodes 56a, 56b, 57a, and 57b are included in a laminated structure, the length of a current path can be increased even in a small apparatus and a relatively high impedance (Z) can be obtained.
The loop electrodes 51A to 51D are obtained by providing the cutouts 50a to 50d in the ground electrodes 50A to 50D provided on the layers 41A to 41D, respectively. A connection electrode 61 provided on the first layer 41A and the end 50Aa of the ground electrode 50A are electrically connected to the input-output terminal electrodes 6 of the radio frequency IC chip 5, or are electromagnetically coupled to the power supply circuit board 10 (the electromagnetic coupling module 1). The ground electrodes 50A to 50D may be electrically connected to each other through via-hole conductors. An electrode functioning as an antenna may not necessarily be a ground electrode.
Furthermore, matching electrodes 62 and 63 are disposed on the inner sides of the loop electrode 51B and 51c, respectively. The connection electrode 61 is connected to one end of the matching electrode 63 through a via-hole conductor 64a, and the other end of the matching electrode 63 is connected to one end of the matching electrode 62 through a via-hole conductor 64b. The other end of the matching electrode 62 is connected to the end 50Ab of the ground electrode 50A through a via-hole conductor 64c.
Similar to the above-described preferred embodiments, in the thirteenth preferred embodiment, the ground electrode 50A functions as an antenna, and provides the same operational advantages as those described in the first preferred embodiment. Furthermore, the length of a current path passing through the loop electrode 51A is increased by the matching electrodes 62 and 63 which are disposed on the inner sides of the loop electrodes 51B and 51C, respectively. The resistance and the real part are therefore increased. As a result, the impedance (Z) can be increased. Similar to the twelfth preferred embodiment, in the thirteenth preferred embodiment, since the matching electrodes 62 and 63 are included in a laminated structure, the length of a current path can be increased in a small apparatus and a relatively high impedance (Z) can be obtained.
By laminating the sheets 11A to 11H, an inductance element L1, an inductance element L2, a capacitance element C1, and a capacitance element C2 are provided. The inductance element L1 includes the conductor patterns 16a that are helically connected by the via-hole conductors 14c, 14d, and 14g. The inductance element L2 includes the conductor patterns 16b that are helically connected by the via-hole conductors 14b, 14e, and 14f. The capacitance element C1 includes the capacitor electrodes 18a and 18b. The capacitance element C2 includes the capacitor electrodes 18b and 17.
One end of the inductance element L1 is connected to the capacitor electrode 18b through the via-hole conductor 13d, the conductor pattern 15a, and the via-hole conductor 13c. One end of the inductance element L2 is connected to the capacitor electrode 17 through the via-hole conductor 14a. The other ends of the inductance elements L1 and L2 are combined on the sheet 11H, and are then connected to the connection electrode 12a through the via-hole conductor 13e, the conductor pattern 15b, and the via-hole conductor 13a. The capacitor electrode 18a is electrically connected to the connection electrode 12b through the via-hole conductor 13b.
The connection electrodes 12a and 12b are respectively electrically connected via the metal bump 8 to the terminal electrodes 6 of the radio frequency IC chip 5. The electrodes 12c and 12d are respectively connected to the terminal electrodes 7 of the radio frequency IC chip 5.
On the bottom surface of the power supply circuit board 10, the outer electrodes 19a and 19b are provided by applying a coating of conductive paste thereto, for example. The outer electrode 19a is coupled to the inductance element L (L1 and L2) by magnetic field coupling. The outer electrode 19b is electrically connected to the capacitor electrode 18b through the via-hole conductor 13f. As described above, the outer electrodes 19a and 19b are electrically connected to the connection electrodes 35a and 35b of the loop electrode 35, or are electrically connected to the connection electrodes 36a and 36b of the loop electrode 36.
In this resonance circuit, the inductance elements L1 and L2 are obtained by the substantially parallel arrangement of two conductor patterns, that is, the conductor patterns 16a and 16b. Since the line lengths of the conductor patterns 16a and 16b are different from each other, the resonance frequencies of the inductance elements L1 and L2 are different from one another. Accordingly, a wider frequency band of a radio frequency IC device can be obtained.
Each of the ceramic sheets 11A to 11H may preferably be a ceramic sheet made of a magnetic material, for example. In this case, the power supply circuit board 10 can be easily obtained by a multilayer board manufacturing process including a sheet lamination method and a thick film printing method, for example.
Each of the sheets 11A to 11H may preferably be a flexible sheet made of a dielectric material, such as polyimide or liquid crystal polymer, for example. In this case, the inductance elements L1 and L2 and the capacitance elements C1 and C2 may be included in a laminate obtained by forming an electrode and a conductor on each of the flexible sheets using a thick film formation method and laminating these sheets by thermocompression bonding.
In the power supply circuit board 10, the inductance elements L1 and L2 and the capacitance elements C1 and C2 are disposed at different locations in a perspective plan view. The inductance elements L1 and L2 are coupled to the outer electrode 19a by magnetic field coupling. The outer electrode 19b functions as one electrode of the capacitance element C1.
Accordingly, in the electromagnetic coupling module 1 in which the radio frequency IC chip 5 is mounted on the power supply circuit board 10, the ground electrode 21 receives high-frequency signals (for example, UHF signals) emitted from a reader/writer (not illustrated). The electromagnetic coupling module 1 causes a resonance circuit, which is coupled to the outer electrodes 19a and 19b by magnetic field coupling and electric field coupling, to resonate via the loop electrode 35 or 36 so as to supply only a received signal that falls within a predetermined frequency range to the radio frequency IC chip 5. On the other hand, predetermined energy is extracted from the received signal, and is then used to cause the resonance circuit to match the frequency of information stored in the radio frequency IC chip 5 to a predetermined frequency and then transmit the information to the ground electrode 21 via the outer electrodes 19a and 19b and the loop electrode 35 or 36. The ground electrode 21 transmits or transfers the information to the reader/writer.
In the power supply circuit board 10, a resonance frequency characteristic is determined by a resonance circuit including the inductance elements L1 and L2 and the capacitance elements C1 and C2. The resonance frequency of a signal emitted from the ground electrode 21 is determined based on the self-resonance frequency of the resonance circuit.
The resonance circuit also functions as a matching circuit to perform the impedance matching between the radio frequency IC chip 5 and the ground electrode 21. The power supply circuit board 10 may include a matching circuit separately from a resonance circuit including an inductance element and a capacitance element (in this sense, a resonance circuit is also referred to as a matching circuit). If a matching circuit function is added to a resonance circuit, the design of the resonance circuit becomes complicated. If a matching circuit is provided separately from a resonance circuit, they can be separately designed. The loop electrodes 35 and 36 may have an impedance matching function or a resonance circuit function. In this case, by designing a resonance circuit (matching circuit) included in the power supply circuit board 10 in view of the shape of a loop electrode and the size of a ground electrode functioning as a radiation plate, a radiation characteristic can be improved.
Similar to the above-described first example of a resonance circuit, a resonance circuit included in the power supply circuit board 70 includes the inductance element L and the capacitance element C, and is coupled to the electrode 35a or 36a facing the inductance element L by magnetic field coupling and the electrode 35b or 36b facing the capacitance element C by electric field coupling. In this second example, since the power supply circuit board 70 is made of a flexible film, the height of the electromagnetic coupling module 1 is reduced. In the inductance element L, a resonance frequency can be adjusted by changing an inductance value. Preferably, the inductance value can be changed by changing the line width or line space of the conductor pattern 72, for example.
Similar to the first example, in the second example, the inductance element L is obtained by helically arranging two conductor patterns, that is, the conductor patterns 72, and connecting them at a central portion of the helical structure. The conductor patterns 72 have different inductance values L1 and L2. Accordingly, similar to the first example, since the resonance frequencies of the conductor patterns 72 can be different from one another other, a wider usable frequency band of a radio frequency IC device can be obtained.
Next, a mobile telephone will be described as an example of an electronic apparatus according to a preferred embodiment of the present invention. A mobile telephone 80 illustrated in
As illustrated in
A radio frequency IC device according to the present invention and an electronic apparatus according to the present invention are not limited to the above-described preferred embodiments, and various changes can be made to the present invention without departing from the spirit and scope of the present invention.
For example, as an electrode for transmitting and receiving a high-frequency signal, not only a ground electrode but also various other electrodes disposed in or on a circuit board can be used. Furthermore, various types of resonance circuits can be used. A material for each of the outer electrode and the power supply circuit board which have been described in the above-described preferred embodiments is provided only as an example. Any suitable material having the required characteristics may be used. A power supply circuit board may also have a radio frequency IC chip function so as to define a radio frequency IC chip and a power supply circuit on a single substrate. In this case, the size and profile of a radio frequency IC device can be reduced.
In the first to fifth preferred embodiments, instead of a radio frequency IC chip, the electromagnetic coupling module 1 described in the sixth and seventh preferred embodiments may be used, for example.
In order to mount a radio frequency IC chip on a power supply circuit board, another method other than a method using a metal bump may be used. A dielectric may be disposed between the electrode of a radio frequency IC chip and the connection electrode of a power supply circuit board so as to provide the capacitive coupling between these electrodes, for example. Furthermore, the capacitive coupling between a radio frequency IC chip and a loop electrode or between a power supply circuit board and a loop electrode may be provided.
An apparatus including a radio frequency IC device is not limited to a radio frequency communication apparatus, such as a mobile telephone. Various apparatuses each provided with a circuit board including a ground electrode, for example, home electric appliances such as a television set and a refrigerator, may be used.
As described above, preferred embodiments of the present invention are useful for a radio frequency IC device including a radio frequency IC chip and an electronic apparatus including the radio frequency IC device, and, in particular, has an advantage of obtaining a reduction is size and easily achieving impedance matching without a dedicated antenna.
While preferred embodiments of the present invention have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing the scope and spirit of the present invention. The scope of the present invention, therefore, is to be determined solely by the following claims.
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| Number | Date | Country | |
|---|---|---|---|
| 20110074584 A1 | Mar 2011 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12235753 | Sep 2008 | US |
| Child | 12959454 | US | |
| Parent | PCT/JP2008/052129 | Feb 2008 | US |
| Child | 11851661 | US | |
| Parent | PCT/JP2008/055962 | Mar 2008 | US |
| Child | PCT/JP2008/052129 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11851661 | Sep 2007 | US |
| Child | 12235753 | US |
