Patent Application
20100093294
The present invention relates to a circuit device for detection that tunes a resonant frequency given by a coil serving as a reception antenna and a resonant capacitor using tuning capacitors, and a mobile apparatus provided with the same.
In recent years, as mobile apparatuses such as cellular phones, those equipped with a reception function of a contactless communication scheme similar to a contactless IC card and the like have been used. A mobile apparatus, which incorporates a power supply such as a battery, does not need to have electric power transmitted thereto, unlike a contactless IC card, but may only be equipped with a function of detecting a reception signal as the reception function. Such a detection device outputs a reception signal induced by a coil serving as a reception antenna via a resonant circuit including the coil for reception and a capacitor and via a rectifier circuit.
As a conventional detection device, one described in Patent Document 1 is known.
As shown in
The gate terminals of the transistors 109a and 109b are connected to each other, and the tuning capacitor 106a and the tuning capacitor 106b have the same capacitance. The tuning capacitors 106a and 106b and the transistors 109a and 109b constitute a pair of tuning elements. Likewise, the gate terminals of the transistors 110a and 110b are connected to each other, and the gate terminals of the transistors 111a and 111b are connected to each other. The tuning capacitors 107a and 107b have the same capacitance, and the tuning capacitors 108a and 108b have the same capacitance. The tuning capacitors 107a and 107b and the transistors 110a and 110b constitute a pair of tuning elements, and the tuning capacitors 108b and 108b and the transistors 111a and 111b constitute a pair of tuning elements.
The bridge rectifier circuit 120 uses the reference terminal 5 as the negative pole for a rectification voltage, and the positive output from the bridge rectifier circuit 120 is outputted via the output terminal 121.
In the conventional contactless transmission system, the coil 101 receives a signal through rough magnetic coupling with a coil for transmission existing outside the detection device, and with this reception, a voltage is generated between the first terminal 3 and the second terminal 4. The voltage generated is rectified by the bridge rectifier circuit 120 and outputted from the output terminal 121 as the detection output. The reception voltage generated between the first terminal 103 and the second terminal 104 will have the largest amplitude when the transmission frequency thereof corresponds with the resonant frequency given by the coil 101 and the capacitor 102. To tune this resonant frequency so as to maximize the detection output, a capacitor pair connected to each other to constitute one tuning element pair are selected from the tuning capacitors 106a, 107a, 108a, 106b, 107b, and 108b. For example, assume that the inductance of the coil 101 is L, the capacitance of the capacitor 102 is C2, and the capacitances of the tuning capacitors 106a and 106b are both C6. When the transistors 109a and 109b are selectively turned ON (brought into conduction) by the control circuit 112, the combined capacitance of the capacitors constituting the resonant circuit will be (C2+C6/2). In this way, the capacitance of the resonant capacitor is adjusted so as to give the maximum amplitude. Also, information on the combination of the capacitor pair to be added to the capacitor 102, i.e., which ones of the transistors 109a to 111a and 109b to 111b are to be turned ON, is stored in the nonvolatile memory 113. Based on the stored information, a signal is sent to the control circuit 112 in the startup process of the apparatus, and the control circuit 112 sets the resonant frequency of the resonant circuit at an appropriate value based on this information.
In
However, the conventional configuration has the problem that if there is a difference between the capacitances connected to the first terminal 103 and the second terminal 104 due to variations in the capacitance values of the tuning capacitors 106a and 106b and the like, the detection output waveform may be distorted, causing a malfunction of a reader device due to the waveform detected at the output terminal 121.
In the case of contactless transmission using an air-core coil, the inductance of the coil is 1 to 2 μH. When the transmission frequency is ten and several MHz, a capacitor having a capacitance of about 100 pF is used as the capacitor 102. In contrast to this, the tuning capacitors 106a to 108a and 106b to 108b have a capacitance smaller than several pF, and these capacitors are normally formed inside a semiconductor integrated circuit together with the transistors 109a to 111a and 109b to 111b. For this reason, the variations in the capacitances of the tuning capacitors 106a and 106b will be as high as about ±20% although depending on the fabrication process of the integrated circuit. Since the charging/discharging currents that are generated in the resonant circuit including the coil 101 and the capacitor 102 and flow through the tuning capacitors 106a and 106b are equal to each other, the amplitudes and wave heights of the voltage waveform D at the first terminal 103 and the voltage waveform E at the second terminal 104 are inversely proportional to the capacitances of the corresponding tuning capacitors. If the capacitance of the tuning capacitor 106a is 0.8 times of the capacitance of the tuning capacitor 106b, the wave height A2 of the voltage waveform D will be 1.25 times of the wave height B2 of the voltage waveform E. The voltage waveform D having increased wave height and amplitude is subjected to clamping of its lower-limit value with the potential of the reference terminal 105 through conduction of a negative-side diode of the bridge rectifier circuit 120. At this time, since the voltage waveform E becomes roughly equal to the original reception signal, the distortion of the waveform further deteriorates. Also, there is a possibility that all transistors may be turned OFF (brought out of conduction). In such a case, it will be a series capacitance of a tuning capacitor and the parasitic capacitance of a transistor that is connected to the first terminal 103 or the second terminal 104. This will further increase the voltage variations.
As described above, the capacitance difference between the tuning capacitors causes a difference between the amplitudes of the voltage waveforms at the first terminal 103 and the second terminal 104, and this distorts the detection output waveform. Such a distorted detection waveform may sometimes cause a malfunction of a device for processing or receiving the waveform.
To solve the problem described above, an object of the present invention is to provide a detection device for tuning the resonant frequency given by a coil serving as a reception antenna and a resonant capacitor using tuning capacitors, in which distortion of a detection output waveform is suppressed, and a mobile apparatus provided with such a detection device.
To attain the above object, the circuit device for detection of the present invention is a circuit device for detection used for rectifying a voltage generated between a first terminal and a reference terminal or between a second terminal and the reference terminal by a reception inductor, the device including: the first terminal and the second terminal; the reference terminal; a reception frequency tuning section including: a first tuning capacitor provided between the first terminal and the reference terminal; a second tuning capacitor provided between the second terminal and the reference terminal; a first switch connected in series with the first tuning capacitor between the first terminal and the reference terminal for permitting or prohibiting conduction between the first tuning capacitor and the reference terminal; and a second switch connected in series with the second tuning capacitor between the second terminal and the reference terminal for permitting or prohibiting conduction between the second tuning capacitor and the reference terminal; and a control circuit section including a first control circuit for controlling the operation of the first switch and a second control circuit for controlling the operation of the second switch.
With the above configuration, which permits individual control of the first switch and the second switch, even when the capacitance varies between the tuning capacitors, the resonant frequency of the resonant circuit including the reception inductor and a capacitor can be regulated precisely by turning ON or OFF the first tuning capacitor and the second tuning capacitor as appropriate. Hence, occurrence of a distortion in the detection output waveform can be effectively suppressed. Accordingly, by using the circuit device for detection of the present invention for a mobile apparatus and the like, occurrence of a malfunction of a reader device and the like in a contactless transmission system can be suppressed.
In particular, by providing two capacitors, i.e., the first and second capacitors, connected in series with each other to constitute the resonant circuit and connecting the node between these capacitors to the reference terminal, the first tuning capacitor and the first capacitor are connected in parallel with each other while the second tuning capacitor and the second capacitor are connected in parallel with each other. This can further reduce the influence of variations in the capacitances of the first tuning capacitor and the second tuning capacitor.
The mobile apparatus of the present invention is a mobile apparatus including: a detection circuit device including a radio wave reception section having a reception inductor for receiving a signal to generate a voltage at both ends and a capacitor one electrode of which is connected to one end or the other end of the reception inductor, a reception frequency tuning section for tuning a resonant frequency to the frequency of the signal, a control circuit section for controlling the operation of the reception frequency tuning section, a tuned data storage section for storing information for allowing the control circuit section to control the reception frequency tuning section; and a detection circuit section for receiving the output of the reception frequency tuning section; and a first terminal, a second terminal, and a reference terminal provided for transmission/reception of the signal between the radio wave reception section and the reception frequency tuning section, wherein the reception frequency tuning section includes: a first tuning capacitor provided between the first terminal and the reference terminal; a second tuning capacitor provided between the second terminal and the reference terminal; a first switch connected in series with the first tuning capacitor between the first terminal and the reference terminal for permitting or prohibiting conduction between the first tuning capacitor and the reference terminal; and a second switch connected in series with the second tuning capacitor between the second terminal and the reference terminal for permitting or prohibiting conduction between the second tuning capacitor and the reference terminal, and the control circuit section includes a first control circuit for controlling the operation of the first switch and a second control circuit for controlling the operation of the second switch.
With the above configuration, which permits individual control of the first switch and the second switch, even when the capacitance varies between the tuning capacitors, the resonant frequency of the resonant circuit including the reception inductor and a capacitor can be regulated precisely by turning ON or OFF the first tuning capacitor and the second tuning capacitor as appropriate. Hence, occurrence of a distortion in the detection output waveform can be effectively suppressed. As a result, occurrence of a malfunction of the device and the like during contactless transmission can be suppressed, and hence, communication can be performed further reliably compared with the case of using a conventional mobile apparatus.
As described above, according to the present invention, in a detection device (circuit device for detection) for tuning the resonant frequency given by a coil serving as a reception antenna and a resonant capacitor using tuning capacitors, variations in tuning capacitor can be absorbed to suppress a distortion in the detection output waveform. Hence, a malfunction of a device for reading the detection can be effectively prevented.
a) is a block diagram of a detection device of Embodiment 1 of the present invention, and
a) is a block diagram of a detection device (circuit device for detection) of Embodiment 1 of the present invention, and
First, as shown in
As shown in
The reception frequency tuning section 32 includes: tuning capacitors 6a, 7a, . . . 8a provided between the first terminal 3 and the reference terminal 5 to be connected in parallel with one another; tuning capacitors 6b, 7b, . . . 8b provided between the second terminal 4 and the reference terminal 5 to be connected in parallel with one another; transistors (first switches) 9a, 10a, . . . 11 a respectively provided between the tuning capacitors 6a, 7a, . . . 8a and the reference terminal 5 to permit or prohibit conduction between the tuning capacitors 6a, 7a, . . . 8a and the reference terminal 5; and transistors (second switches) 9b, 10b, . . . 11b to permit or prohibit conduction between the tuning capacitors 6b, 7b, . . . 8b and the reference terminal 5. The tuning capacitors 6a, 7a, . . . 8a are connected in parallel with the first capacitor 2a, and the tuning capacitors 6b, 7b, . . . 8b are connected in parallel with the second capacitor 2b. The number of capacitor pairs each including a tuning capacitor provided between the first terminal 3 and the reference terminal 5 and a tuning capacitor provided between the second terminal 4 and the reference terminal 5 and designed to have the same capacitance as the counterpart tuning capacitor, is not limited specifically, but may be set arbitrarily. The tuning capacitors 6a and 6b, the tuning capacitors 7a and 7b, and the tuning capacitors 8a and 8b respectively have the same capacitances.
The control circuit section 33 includes: a first control circuit 12a for controlling the operation of the transistors 9a, 10a and 11a individually; and a second control circuit 12b for controlling the operation of the transistors 9b, 10b and 11b individually.
The tuned data storage section 34 includes a nonvolatile memory 13 for storing information on which ones of the transistors 9a to 11a and 9b to 11b should be turned ON. The information is supplied to the first control circuit 12a and the second control circuit 12b. The transistor control information may be stored in advance, or may be received from outside the detection device. As the nonvolatile memory 13, a ROM writable after fabrication of the detection circuit, an FeRAM, an MRAM, a MONOS and the like may be used. In the case of supplying control information from outside the detection device, a latch circuit, a DRAM, and the like may be used in place of the nonvolatile memory 13.
The detection circuit section 35 includes: an output terminal 21, an output capacitor 22 provided between the reference terminal 5 and the output terminal 21; and a bridge rectifier circuit 20 provided between the first and second terminals 3 and 4 and the output terminal 21. The output terminal 21, which is also the output terminal of the detection device, serves as the positive pole for the bridge rectification voltage. The reference terminal 5 serves as the negative pole for the rectification voltage. The bridge rectifier circuit 20 includes: a first diode whose anode is connected to the first terminal 3 and whose cathode is connected to the output terminal 21; a second diode whose anode is connected to the second terminal 4 and whose cathode is connected to the output terminal 21; a third diode whose anode is connected to the reference terminal 5 and whose cathode is connected to the anode of the first diode and the first terminal 3; and a fourth diode whose anode is connected to the reference terminal 5 and whose cathode is connected to the anode of the second diode and the second terminal 4. The output capacitor 22 is provided for smoothing the detection output, which may be omitted depending on the circuit configuration.
In the example shown in
The capacitances of the tuning capacitors 6a, 7a, 8a, 6b, 7b, and 8b are considerably small compared with the capacitances of the first capacitor 2a and the second capacitor 2b.
The operation of the detection device configured as described above will be described.
In the detection device of this embodiment, the coil 1 receives a signal through rough magnetic coupling with a coil for transmission existing outside the detection device. With this signal reception, a voltage is generated between the first terminal 3 and the second terminal 4. The voltage generated between the terminals is rectified by the bridge rectifier circuit 20 and outputted from the output terminal 21 as the detection output. The frequency of the reception signal is about 13.56 MHz to 14 MHz, for example. The reception voltage generated between the first terminal 3 and the second terminal 4 will have the largest amplitude when the frequency of the reception signal corresponds with the resonant frequency of a resonant circuit including the coil 1, the first capacitor 2a, and the second capacitor 2b. To tune this resonant frequency so as to maximize the detection output, a pair of capacitors to be connected to the resonant circuit are selected from the tuning capacitors 6a to 8a and 6b to 8b. For example, assume that the inductance of the coil 1 is L, the capacitances of the first capacitor 2a and the second capacitor 2b are both C2, and the capacitances of the tuning capacitors 6a and 6b are both C6. When the transistors 9a and 9b are turned ON by the first control circuit 12a and the second control circuit 12b, the tuning capacitor 6a is in parallel connection with the first capacitor 2a, and the tuning capacitor 6b is in parallel connection with the second capacitor 2b. Hence, the combined capacitance of the capacitors constituting the resonant circuit is (C2+C6)/2. In this way, the capacitance of the resonant capacitors is adjusted so as to obtain the maximum amplitude. Also, information on the combination of capacitors added to the first capacitor 2a and the second capacitor 2b, i.e., which ones of the transistors 9a to 11a and 9b to 11b are to be turned ON, is stored in the nonvolatile memory 13 as described above. Based on the stored information, the tuned data storage section 34 transmits a signal to the first control circuit 12a and the second control circuit 12b in the startup process of the apparatus, so that the resonant frequency of the resonant circuit is set to an appropriate value.
In the detection device of this embodiment shown in
Next, the waveforms observed when the capacitances of the tuning capacitors vary will be described. For example, when the inductance of the coil 1 is 1 to 2 μH and the transmission frequency of the reception signal is ten and several MHz, a capacitor having a capacitance of about 200 pF is used as the first capacitor 2a and the second capacitor 2b individually since the first and second capacitors 2a and 2b are connected in series with each other. In contrast to this, the tuning capacitors 6a to 8a and 6b to 8b have a capacitance not more than several pF and are often formed inside a semiconductor integrated circuit together with the transistors 9a to 11a and 9b to 11b. For this reason, the variations in the capacitances of the tuning capacitors will be as high as about ±20% although depending on the fabrication process of the integrated circuit. For example, assume that only the transistors 9a and 9b are ON, the capacitances of the first and second capacitors 2a and 2b are both 200 pF, the capacitance of the tuning capacitor 6a is 4 pF, and the capacitance of the tuning capacitor 6b is 5 pF. In this case, while the parallel capacitance of the first capacitor 2a and the tuning capacitor 6a, 204 pF, is connected between the first terminal 3 and the reference terminal 5, the parallel capacitance of the second capacitor 2b and the tuning capacitor 6b, 205 pF, is connected between the second terminal 4 and the reference terminal 5. This difference in capacitance is minute compared with the capacitance of the resonant circuit. Since the first capacitor 2a and the second capacitor 2b are provided separately from the integrated circuit, variations in the capacitances of these capacitors can be suppressed greatly compared with those of the tuning capacitors. Hence, in the detection device of this embodiment, since the capacitances of the first and second capacitors 2a and 2b are far greater than and dominant over those of the tuning capacitors, and the capacitance difference between the first capacitor 2a and the second capacitor 2b is minute, the variations in tuning capacitor are absorbed. As a result, the difference in amplitude between the waveform at the first terminal 3 and the waveform at the second terminal 4 is only about 0.002%, hardly causing a distortion in the detection waveform at the output terminal 21. Hence, the waveforms at the first terminal 3, the second terminal 4, and the output terminal 21 in the detection device of this embodiment are roughly like the ideal waveforms A, B, and C shown in
In this embodiment, also, the transistors 9a to 11a and the transistors 9b to 11b can be individually turned ON/OFF.
With the above configuration, variations in the capacitances of the first capacitor 2a and the second capacitor 2b can also be adjusted. For example, when the capacitance of the first capacitor 2a is 200 pF and the capacitance of the second capacitor 2b is 204 pF, the transistor 9a and the transistor 9b may be turned ON and OFF, respectively, so that a capacitance of 204 pF will be connected to both the first terminal 3 and the second terminal 4. In this case, tuning of the resonant frequency can be performed using other tuning capacitors, and this almost eliminates the difference in amplitude between the waveforms at the first terminal 3 and the second terminal 4. Hence, occurrence of a distortion in the detection waveform is suppressed.
In the detection device of this embodiment, the voltage changes occurring at the first terminal 3 and the second terminal 4 provide waveforms having phases inverted 180° from each other and the same amplitude. The bottom points of these voltage waveforms are equal to or more than the potential of the reference terminal 5, and hence, the two negative-side diodes connected to the reference terminal 5 in the bridge rectifier circuit 20 shown in
However, the configuration having the bridge rectifier circuit 20 is desired to ensure that the voltages at the first terminal 3 and the second terminal 4 are prevented from becoming a negative potential even when the amplitude of the reception waveform varies during startup and in a transient state in which the positional relationship between the coil for reception and the coil for transmission changes.
In the detection device of this embodiment, the first capacitor 2a and the second capacitor 2b can be integrated on the same semiconductor substrate as the reception frequency tuning section 32, the control circuit section 33, and the like. In this case, the variations in the capacitances of the first and second capacitors 2a and 2b may increase compared with the case of forming these capacitors separately from the integrated circuit. However, with the individual control of the transistors 9a, 10a, . . . 11a and the transistors 9b, 10b, . . . 11b, the variations in capacitance can be reduced. Hence, by placing the first and second capacitors 2a and 2b inside the integrated circuit, the mounted area of the detection device can be widely reduced compared with the case of placing the capacitors outside the integrated circuit.
In the reception frequency tuning section 32, when a plurality of tuning capacitors are connected to the first terminal 3, the capacitances of the tuning capacitors may be equal to each other or may be different from each other as appropriate. This also applies to tuning capacitors connected to the second terminal 4.
The detection device of this embodiment is different from the detection device of Embodiment 1 shown in
In other words, a feature of the detection device of this embodiment is that the positive-side rectifier circuit is configured as a synchronous rectifier circuit with respect to negative-side diodes 24a and 24b that are ON only during transition when the reception state changes and are not ON during steady-state operation. The other configuration is similar to the detection device of Embodiment 1.
In the detection device of this embodiment, the transistor 16a connected in parallel with the diode 23a is ON when the voltage at the first terminal 3 is higher than the voltage at the second terminal 4, and the transistor 16b connected in parallel with the diode 23b is ON when the voltage at the second terminal 4 is higher than the voltage at the first terminal 3. Since a voltage drop caused by ON resistance of a transistor is small compared with a voltage drop caused by a diode, this configuration suppresses a forward voltage drop in the positive-side rectifier circuit, and hence can increase the level of the detection output.
In the detection devices of Embodiments 1 and 2, the capacitance difference due to variations in tuning capacitor was described as occurring because the tuning capacitors were formed in the same semiconductor integrated circuit as the transistors. However, the detection device of the present invention is not limited to the configurations described above. Even in the case of placing variation-suppressed tuning capacitors outside the integrated circuit, there is a possibility that all transistors may become OFF unexpectedly to during operation. In such a case, it will be a series capacitance of a tuning capacitor and the parasitic capacitance of a transistor that is connected to the first terminal 3 and the second terminal 4, and this will further increase the variations in capacitance. Hence, the configurations of the present invention provide an effect of suppressing distortion in detection waveform irrespective of whether the tuning capacitors are placed inside or outside the integrated circuit, and hence can effectively suppress occurrence of a malfunction and the like in a contactless transmission system.
Also, by forming major components of the detection device of the present invention on the same semiconductor substrate as one integrated circuit, the convenience of the device is facilitated. For example, as shown in
As mentioned earlier, the numbers of tuning capacitors and transistors corresponding to the tuning capacitors are not limited. By increasing the number of the tuning elements, wider-range regulation, or fine-tuning, of the capacitance can be achieved. This makes it easy to respond to a change in the reception state of the detection device, switching of the communication frequency, and the like.
In the detection device of this embodiment, the first terminal 3 serves as the junction point between the tuning capacitors 6a to 8a and the radio wave reception section, and the second terminal 4 serves as the junction point between the tuning capacitors 6b to 8b and the radio wave reception section.
Specifically, in the detection device of this embodiment, a non-divided capacitor 2 constitutes a resonant circuit together with the coil 1, and the first terminal 3 and the second terminal 4 are connected to the same end (one end) of the coil 1 and the same electrode (one electrode) of the capacitor 2. The reference terminal 5 is connected to the other end of the coil 1 and the other electrode of the capacitor 2. The tuning capacitors 6a and 6b are designed to have the same capacitance and are both connected in parallel with the capacitor 2. The transistor 9a is provided between the tuning capacitor 6a and the reference terminal 5, and the transistor 9b is provided between the tuning capacitor 6b and the reference terminal 5. The operations of the transistor 9a and the transistor 9b are individually controlled by the first control circuit 12a and the second control circuit 12b, respectively. The anode of a diode 17 is connected to the coil 1, the capacitor 2, the first terminal 3, and the second terminal 4, and the cathode thereof is connected to an output terminal 21a and the output capacitor 22. The nonvolatile memory 13 is connected to the third terminal 40.
With the above configuration, also, in which the transistors 9a and 9b can be individually controlled, the variations in the capacitances of the tuning capacitors 6a and 6b can be suppressed.
In the detection device of this embodiment, also, the convenience can be facilitated by integrating the tuning capacitors 6a and 6b, the transistors 9a and 9b, the first control circuit 12a, the second control circuit 12b, the nonvolatile memory, and the like on the same semiconductor substrate.
In the integrated circuit, the numbers of tuning capacitors connected to the first terminal 3 and tuning capacitors connected to the second terminal 4 are not specifically limited.
As Embodiment 4 of the present invention, a configuration of a mobile apparatus equipped with the detection device of the present invention will be described.
As shown in
The detection device 30 includes the radio wave reception section 31, the reception frequency tuning section 32, the control circuit section 33, the tuned data storage section 34, and the detection circuit section 35.
In the mobile apparatus of
In the radio wave reception section 31, which corresponds to the coil 1 for reception, the first capacitor 2a, and the second capacitor 2b shown in
The reception frequency tuning section 32 corresponds to the tuning capacitors 6a to 8a and 6b to 8b and the transistors 9a to 11a and 9b to lib shown in
The resonant frequency in the radio wave reception section 31 is tuned in the reception frequency tuning section 32, and the detection output from the detection circuit section 35 is sent to the data processing section 36. The data processing section 36 processes the data to a logic signal and sends the logic signal to the baseband section 37. The baseband section 37 sends a signal for frequency tuning to the tuned data storage section 34, so that the operation of frequency tuning as described above is performed repeatedly, until the frequency is set to a value with which the detection output level is appropriate.
Once the resonant frequency in the radio wave reception section 31 becomes an appropriate frequency, the tuned data is stored in the tuned data storage section 34. The tuned data storage section 34 sends a control signal to the control circuit section 33 based on the stored information in the startup process of the mobile apparatus 39, so that the resonant frequency in the radio wave reception section 31 is set to an appropriate value every time the startup process is performed. With the tuned data storage section 34 storing a once-tuned value, it is unnecessary to perform the frequency tuning operation in the startup process. Note that similar operation to that described above will also be performed when the tuned data storage section 34 includes a volatile memory such as a latch circuit.
The mobile apparatus of this embodiment, which uses a detection device absorbing variations in tuning capacitor to thereby suppress a distortion in the detection output waveform, can suppress occurrence of a malfunction during communication and hence can perform contactless data communication more reliably.
The detection device in this embodiment may have any of the configurations described in Embodiments 1 to 3.
The present invention is useful for terminal apparatuses and the like equipped with a reception function of a contactless communication scheme.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2007-316651 | Dec 2007 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2008/002916 | 10/15/2008 | WO | 00 | 6/17/2009 |
