WO2005092181A1 - 生体情報計測装置 - Google Patents
生体情報計測装置 Download PDFInfo
- Publication number
- WO2005092181A1 WO2005092181A1 PCT/JP2005/002020 JP2005002020W WO2005092181A1 WO 2005092181 A1 WO2005092181 A1 WO 2005092181A1 JP 2005002020 W JP2005002020 W JP 2005002020W WO 2005092181 A1 WO2005092181 A1 WO 2005092181A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- biological information
- main body
- measuring device
- information measuring
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6802—Sensor mounted on worn items
- A61B5/681—Wristwatch-type devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
Definitions
- the present invention relates to a biological information measuring device capable of measuring biological information such as a pulse rate while being worn on a wrist (arm).
- this type of biological information measuring device for example, one that calculates a pulse rate irradiates light toward a living body while being attached to a wrist, and measures blood pressure in a blood vessel by a pulse sensor or the like.
- the backscattered light is received, the backscattered light power pulse signal is extracted, and the pulse rate is calculated.
- the pulse rate can be easily measured while worn on the wrist, so that it is easily used by users.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-78973 (Paragraph No. 0011-0031, FIGS. 1 to 7)
- the biological information measuring device irradiates a living body with light from a light irradiating unit such as an LED (Light Emitting Diode), and transmits light from the living body to a light receiving unit such as a PD (Photo Diode).
- a light irradiating unit such as an LED (Light Emitting Diode)
- a light receiving unit such as a PD (Photo Diode).
- the backscattered light is received, and biological information such as pulse is detected based on the amount of the backscattered light received.
- the PD when receiving the backscattered light from the living body, the PD may directly receive a part of the light irradiated by the LED. Since this directly incident light does not contain any information from the living body, noise (noise) increases, causing a decrease in the S / N ratio and saturation of the detection voltage. For this reason, there was a possibility that biological information could not be detected accurately.
- the biological information measuring device Even if the biological information measuring device is securely attached to the wrist, even under strong sunlight such as outdoors, the living body information measuring device may be placed between the lower surface of the body where the LEDs and PDs are arranged and the surface of the living body. There was a possibility that the external light propagating through the tissue would enter the PD without being sufficiently attenuated. This extraneous light, as described above, caused a decrease in the SZN ratio.
- the present invention has been made in view of such circumstances, and has as its object to directly enter a light receiving unit from a light irradiation unit or to apply external light propagating through a living tissue to light.
- An object of the present invention is to provide a biological information measuring device capable of minimizing incident light to a light receiving section and improving an SZN ratio.
- the present invention provides the following means in order to solve the above problems.
- the biological information measuring device of the present invention includes a main body, fixing means for fixing the main body to an arm with the lower surface of the main body facing the living body surface side, and a living body in contact with the living body surface.
- a light emitting unit that emits light toward the light emitting unit, and a light receiving unit that receives backscattered light from a living body in the light emitted by the light emitting unit and generates a biological information signal according to the amount of received light.
- a biological sensor provided on the lower surface of the main body, and a biological information calculator provided on the main body and calculating biological information based on the biological information signal.
- a light shielding unit is provided between the light receiving unit and the light receiving unit to prevent light emitted from the light emitting unit from directly entering the light receiving unit.
- the main body is attached to the wrist (arm) with the lower surface of the main body facing the living body side by the fixing means, and then the light is emitted from the light emitting section toward the living body. Irradiate.
- the irradiated light is absorbed and scattered by tissues and blood such as fat and muscle in a living body, and a part of the irradiated light is detected by the light receiving unit as backscattered light.
- the detected light fluctuates as the blood volume changes due to pulsation.
- the light receiving unit receives the backscattered light and generates a pulse signal (biological information signal) according to a change in the amount of received light.
- the biological information calculating section can perform predetermined processing on the biological information signal to detect biological information such as a pulse rate.
- the light shielding unit is provided between the light emitting unit and the light receiving unit, the light emitted from the light emitting unit is directly incident on the light receiving unit. Sure enough to do It is actually irradiated toward the living body. Therefore, the light receiving section can collectively collect the backscattered light from the living body. Therefore, the SZN can be improved, and more accurate detection of biological information can be performed.
- the biological sensor unit in the biological information measuring device of the present invention, is disposed substantially at the center of the lower surface of the main body.
- a reflection groove for reflecting external light propagating through the living tissue from the center of the lower surface toward the outer edge of the lower surface is formed! Puru.
- the biological information measuring device when the main body is attached to a wrist (arm) to detect biological information, the device is exposed to strong sunlight such as outdoors. Even if the external light propagating through the living tissue becomes large, the external light is reflected again by the reflection groove toward the outer edge portion on the incident side. Therefore, it is possible to prevent external light from being directly incident on the biological sensor unit as much as possible. In other words, the light receiving unit can intensively receive the backscattered light of the biological force without being affected by external light. Therefore, the SZN can be improved, and biological information can be detected more accurately.
- the biological information measuring device of the present invention is the biological information measuring device of the present invention, wherein the reflection groove is formed by a reflection inclined from a center of the lower surface of the main body toward an outer edge of the lower surface. Surface.
- the reflecting surface is formed in a circular shape centering on the biological sensor portion, and the reflecting groove is formed in the biological sensor.
- a plurality of the reflecting surfaces are provided in the radial direction with the portion as the center.
- the incidence of external light can be more reliably prevented. That is, light incident on the outer edge portion is reflected by the reflection surface formed closest to the outer edge portion. Then, the light is reflected to the outer edge side, and the light intensity decreases. The light that has passed through this reflecting surface is similarly reflected by the next reflecting surface to the outer edge side, and the light intensity further decreases. As described above, since the light intensity of the external light gradually decreases toward the center of the main body, it is possible to more reliably prevent the external light from being incident on the living body sensor.
- the reflection surface is formed in a spiral shape around the biological sensor unit.
- the reflection surface is formed in a spiral shape around the biological sensor portion, light incident on the outer edge is formed closest to the outer edge. The light is reflected to the outer edge side by the reflection surface, and the light intensity is reduced. The light passing through this reflecting surface is similarly reflected by the next reflecting surface to the outer edge side, and the light intensity further decreases.
- the light intensity of the external light is reduced stepwise toward the center of the main body, it is possible to more reliably prevent the external light from being incident on the biological sensor unit.
- it is spiral it is easy to form a reflection surface.
- the lower surface of the main body reflects external light propagating through the biological tissue. It is formed of a black member that reflects at a rate of 10% or less.
- the external light propagating through the living tissue toward the living body sensor unit that is, the living tissue from the outer edge of the main body toward the center is removed.
- the propagating light is repeatedly reflected between the lower surface of the main body and the surface of the living body, and the light intensity decreases each time the light is reflected on the lower surface of the main body. Therefore, it is possible to reliably prevent the incidence of external light.
- the biological information measuring device of the present invention when detecting biological information, since the light shielding portion is provided between the light emitting portion and the light receiving portion, the light is emitted from the light emitting portion. The emitted light is surely applied to the living body without directly entering the light receiving unit. Therefore, since the light receiving unit can collect the backscattered light of the vitality in a concentrated manner, the SZN can be improved, and the biological information can be detected more accurately.
- FIG. 1 is a front view showing an embodiment of a biological information measuring device according to the present invention.
- FIG. 2 is a rear view of the biological information measuring device shown in FIG. 1.
- FIG. 3 is a side view showing a state where the biological information measuring device shown in FIG. 1 is mounted on a wrist.
- FIG. 4 is a side view showing a state in which the biological information measuring device shown in FIG. 1 is mounted on a wrist, viewed from a direction opposite to the direction shown in FIG. 3.
- FIG. 5 is a cross-sectional view taken along line CC of the biological information measuring device shown in FIG. 3.
- FIG. 6 is a sectional view taken along the line DD of the biological information measuring device shown in FIG. 1.
- FIG. 7 is an enlarged sectional view of a reflection groove formed in the biological information measuring device shown in FIG. 1.
- B surface of living body
- 1 biological information measuring device
- 2a lower surface of main body
- 2c outer edge
- 3... fixing means 4-LED (light emitting section)
- 5 ⁇ ⁇ ⁇ Light receiving unit
- 6 ⁇ biological sensor unit
- 7 ⁇ data processing unit biological information calculation unit
- 27 ⁇ ⁇ ⁇ light shielding unit 35 ⁇ ⁇ ⁇ reflective groove, 36 ⁇ ⁇ reflective surface
- the biological information measuring device 1 of the present embodiment is of a wristwatch type, and calculates a pulse rate, which is biological information, when worn on a wrist (arm). It is.
- the biological information measuring device 1 has a housing in which various electric components and electronic components are built.
- an LED Light Emitting Diode
- light emitting portion for irradiating light toward the living body while being in contact with the living body surface B side, and a light radiated by the LED 4
- a PD Photo Diode
- light receiving unit that receives backscattered light from the living body and generates a pulse signal (biological information signal) according to the amount of received light.
- the living body sensor section 6 is disposed substantially at the center of the lower surface 2a of the housing 2.
- a data processing unit (biological information calculation unit) 7 for calculating a pulse rate based on the generated pulse signal is provided.
- the housing 2 is made of a metal material such as plastic or aluminum. It has a predetermined thickness and is formed, for example, in a substantially rectangular shape when viewed from above.
- a substantially square cover glass 10 is fitted into the center of the upper surface 2b of the housing 2, and a display for displaying the calculated pulse rate and other various information is provided inside the cover glass 10.
- Part 11 is arranged.
- a main board 12 is provided in the housing 2, and the data processing section 7, the display section 11, and the charging section are provided on the main board 12.
- a possible rechargeable battery 13, a memory 14 for recording a pulse rate, a sub-board 15, and other various electronic components are electrically connected by mounting or wiring.
- the data processing unit 7 includes an IC component such as a CPU, and once amplifies the pulse signal generated by the PD 5 with an amplifier or the like, performs predetermined processing such as fast Fourier transform processing (FFT processing). It has a function to calculate the pulse rate by analyzing the processing result. In addition, the data processing unit 7 records the calculated pulse rate in the memory 14 and displays the calculated pulse rate on the display unit 11 based on the input from each button 20 described later! . Further, the data processing unit 7 has a function of comprehensively controlling other components.
- FFT processing fast Fourier transform processing
- the display unit 11 is, for example, a liquid crystal display such as an LCD (Liquid Crystal Display), and has a time display function of displaying a time counted by a crystal oscillator (not shown), for example, in addition to the pulse rate described above. And a function for displaying various other information. For example, time, date, day of the week, remaining power of the rechargeable battery 13 and the like can be displayed.
- LCD Liquid Crystal Display
- the housing 2 includes a plurality of buttons 20, for example, three buttons 20 and a housing 20 arranged on the upper surface 2b of the housing 2 and below the display unit 11.
- One button 20 is provided on the side of 2!
- various operations can be performed. For example, it is possible to perform operations such as starting and stopping the measurement of the pulse rate, switching the display between the pulse rate and the time, and transmitting the pulse rate data recorded in the memory 14 to an external device.
- an external connection terminal (charging means) 21 is provided on a side surface of the housing 2 for supplying power to the rechargeable battery 13 from outside such as a charger to charge the battery.
- a cover or the like may be attached so as to cover the external connection terminal 21 to protect the external connection terminal 21. By doing so, it becomes possible to protect the external connection terminal 21 from water drops, dust, and the like, which is more preferable. It is.
- not only the external connection terminal 21 but also a transformer and the like for supplying power in the charger and the housing 2 may be provided to charge the rechargeable battery 13 in a non-contact state. .
- a through hole 22 is formed at the center of the lower surface 2 a of the housing 2 so as to penetrate the outside and the inside of the housing 2, and a cover glass is formed so as to close the through hole 22.
- 23 is fixed to the housing 2.
- the LED 4 and PD 5 are arranged adjacent to each other in a direction perpendicular to the longitudinal direction of the housing 2 so as to be in contact with the inside of the cover glass 23.
- the LED 4 and the PD 5 are mounted on one end side of the flexible board 24 electrically connected to the sub-board 15 and are electrically connected to the sub-board 15.
- the pulse signal generated by the PD 5 is sent to the data processing unit 7 via the flexible board 24, the sub board 15, and the main board 12.
- a light shielding plate for preventing light emitted from the LED 4 from directly entering the PD. 27 are provided.
- the light shielding plate 27 is formed in a plate shape from a metal such as plastic or aluminum, and is provided on the flexible substrate 24 so as to be in contact with the cover glass 23.
- the light shielding plate 27 may be provided on the inner surface of the cover glass 23 so as to be in contact with the flexible substrate 24.
- the living body sensor unit 6 of the present embodiment has a contact detection for detecting whether the LED 4 and the PD 5 are in contact with the body surface B or not. Means 30 are provided.
- the contact detecting means 30 has a pair of electrodes 30a, 30b, and the pair of electrodes 30a, 30b is arranged on the lower surface 2a of the housing 2 with the LED 4 and the PD 5 interposed therebetween. . That is, the pair of electrodes 30a and 30b, the LED 4 and the PD 5 are arranged so as to be aligned in a direction orthogonal to the longitudinal direction of the housing 2.
- the pair of electrodes 30a and 30b are provided so that the tips thereof slightly protrude from the lower surface 2a of the housing 2, and are provided such that the base ends are electrically connected to the sub-board 15. .
- the pair of electrodes 30a and 30b contact the living body surface B based on the potential difference between the electrodes. It has a function to detect the presence or absence of a force.
- the data processing unit 7 is set to control the operation of the LED 4 so as to irradiate the LED 4 with light, for example, when it is detected that the LED 4 is in contact with the biological surface B.
- the present invention is not limited to this case. For example, it may be set so that the FFT processing is not performed when it is detected that the FFT process is not in contact with the living body surface B.
- the lower surface 2a of the housing 2 A reflection groove 35 is formed to reflect external light incident between the outer edge portion 2c and the central force of the lower surface 2a.
- the reflection groove 35 is formed in a circular shape with the biological sensor unit 6 as a center, and is formed by radially extending a reflection surface 36 formed so that the surface is inclined from the lower surface 2a of the housing 2 toward the outer edge 2c. There are a plurality of them.
- the fixing means 3 has a first band 40 and a second band 41 each having a proximal end attached to the housing 2 and capable of being attached to the wrist A.
- the first band 40 and the second band 41 are provided in the longitudinal direction of the housing 2 so as to face each other with the housing 2 interposed therebetween.
- the first band 40 has a buckle 40a and a tundler 40b attached to the tips.
- a plurality of insertion holes 4la into which the above tundas 40b are inserted are formed along the longitudinal direction of the second band 41.
- the lengths of the first band 40 and the second band 41 can be adjusted according to the thickness of the wrist A of the user.
- both bands 40 and 41 are wound around the wrist A of the user, and the tundler 40b of the first band 40 is wound according to the size of the wrist A. Insert the second band 41 into the insertion hole 41a, and attach the housing 2 to the wrist A. When the housing 2 is mounted on the wrist A, the surface of the living body B and the lower surface 2a of the housing 2 come into close contact with each other.
- the pair of electrodes 30a and 30b comes into contact with the living body surface B.
- the pair of electrodes 30a and 30b project slightly from the lower surface 2a of the housing 2. Since it is arranged so that it comes out, it is easy to come into contact with the biological surface B.
- the data processing unit 7 detects that the pair of electrodes 30a and 30b is surely in contact with the living body surface B. That is, it is detected that the living body sensor section 6 including the LEDs D4 and PD5 is securely in contact with the living body surface B.
- the data processing unit 7 When detecting that the LED 4 and the PD 5 are in contact with the living body surface B, the data processing unit 7 irradiates light from the LED 4 toward the living body. At this time, since the shielding plate 27 is provided between the LED 4 and the PD 5, a part of the irradiated light does not enter the PD 5. In other words, the emitted light is reliably emitted toward the living body.
- the irradiated light is absorbed and scattered by tissues and blood such as fat and muscle in a living body, and a part of the irradiated light is detected by PD5 as backscattered light.
- the detected light fluctuates with a change in blood volume due to pulsation.
- the PD 5 receives the backscattered light, generates a pulse signal (biological information signal) corresponding to a change in the amount of received light, and outputs the pulse signal to the data processing unit 7.
- the amount of backscattered light of the light emitted from the LED 4 fluctuates according to the blood flow fluctuation in the arteries and arterioles inside the wrist A (living body). It is possible to receive the backscattered light according to the wave. This allows the PD 5 to generate a pulse signal.
- the PD 5 concentrates the backscattered light of the biological force. Focus light. Therefore, noise and the like can be suppressed, and the S / N ratio can be improved.
- the data processing section 7 After amplifying the transmitted pulse signal, the data processing section 7 performs predetermined processing such as FFT processing, and then performs analysis to calculate the pulse rate. As described above, since the calculated pulse rate is calculated based on the pulse signal in which the influence of noise or the like is reduced, the calculated pulse rate becomes a more accurate value. Then, the data processing unit 7 records the calculated pulse rate in the memory 14 and displays the calculated pulse rate on the display unit 11 based on the operation of each button 20.
- predetermined processing such as FFT processing
- buttons 20 When necessary to display the easily calculated pulse rate. Since it can be displayed on the display unit 11 for confirmation, it is simple to use. In addition, the user can operate the buttons 20 to check other information other than the pulse rate, such as the time and the remaining power of the rechargeable battery 13, on the display unit 11. ,.
- the light that has propagated through the living tissue and is incident on the outer edge 2c is first reflected again by the reflection surface 36 formed on the outer edge 2c side toward the outer edge 2c.
- Light intensity decreases.
- the light that has passed through the first reflecting surface 36 is similarly reflected by the next reflecting surface 36 toward the outer edge 2c.
- the plurality of reflecting surfaces 36 are formed around the biological sensor unit 6, the light intensity of the external light decreases stepwise from the outer edge 2c toward the center. Therefore, it is possible to prevent external light from being directly incident on the biological sensor unit 6 as much as possible. That is, it is possible to prevent external light from directly entering the PD 5 as much as possible.
- the charging can be performed by connecting a charging cord or the like connected to a charger to the external connection terminal 21. Need not be provided separately. Accordingly, maintenance costs can be reduced.
- An audio output means such as a buzzer for outputting an audio is provided in the housing 2, and when the charged amount of the rechargeable battery 13 decreases to near "0", an audio is output to charge the battery (charging time). ) May be configured to be notified.
- the light shielding plate 27 is provided between the LED 4 and the PD 5, so that the light is emitted from the LED 4.
- the emitted light is directed toward the living body without being directly incident on PD5. Therefore, since the PD 5 can collectively receive the backscattered light of the biological force, the SZN can be improved, and the pulse rate can be calculated more accurately.
- the technical scope of the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention.
- the reflection groove is configured to have a plurality of reflection surfaces formed in a circular shape around the biological sensor unit in the radial direction, but may be one instead of a plurality.
- the reflection surface is formed in a circular shape with the biosensor portion as the center, but is not limited to a circular shape.
- the reflecting surface may be formed spirally around the biological sensor. In this case, in addition to providing the same operation and effect as in the above embodiment, it is easy to form a reflection groove on the lower surface of the housing.
- the lower surface of the housing may be formed of a black member that reflects external light incident between the lower surface and the surface of the living body at a reflectance of 10% or less.
- the light intensity decreases every time the external light is reflected on the lower surface of the housing, so that the combination with the reflection groove can more reliably prevent the external light from directly entering the biological sensor. Is preferred.
- the pulse rate is described as an example of the biological information, but the present invention is not limited to the pulse rate, and may be any biological information.
- a function such as a wireless communication unit capable of wirelessly communicating with another electronic device may be added to the housing.
- the pulse rate recorded in the memory can be transmitted to an external electronic device by wireless communication such as Bluetooth, or various information can be obtained in the memory.
- the biological information measuring device when detecting biological information, the light emitted from the light emitting unit is provided because the light shielding unit is provided between the light emitting unit and the light receiving unit. Is reliably directed toward the living body without directly entering the light receiving unit. Therefore, since the light receiving section can collect the centrally scattered back light of the biological force, the SZN can be improved and the biological information can be detected more accurately.
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004091944A JP4476665B2 (ja) | 2004-03-26 | 2004-03-26 | 生体情報計測装置 |
JP2004-091944 | 2004-03-26 |
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WO2005092181A1 true WO2005092181A1 (ja) | 2005-10-06 |
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PCT/JP2005/002020 WO2005092181A1 (ja) | 2004-03-26 | 2005-02-10 | 生体情報計測装置 |
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WO (1) | WO2005092181A1 (ja) |
Families Citing this family (2)
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US9386932B2 (en) | 2012-10-29 | 2016-07-12 | Microsoft Technology Licensing, Llc | Wearable personal information system |
JP5880536B2 (ja) * | 2013-12-26 | 2016-03-09 | セイコーエプソン株式会社 | 生体情報検出器及び生体情報測定装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11235320A (ja) * | 1998-02-23 | 1999-08-31 | Seiko Epson Corp | 生体情報計測装置 |
JP2002330936A (ja) * | 2001-02-02 | 2002-11-19 | Nippon Telegr & Teleph Corp <Ntt> | 血流計及び血流計のセンサ部 |
JP2005040261A (ja) * | 2003-07-25 | 2005-02-17 | Waatekkusu:Kk | 脈波センサ |
-
2004
- 2004-03-26 JP JP2004091944A patent/JP4476665B2/ja not_active Expired - Fee Related
-
2005
- 2005-02-10 WO PCT/JP2005/002020 patent/WO2005092181A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11235320A (ja) * | 1998-02-23 | 1999-08-31 | Seiko Epson Corp | 生体情報計測装置 |
JP2002330936A (ja) * | 2001-02-02 | 2002-11-19 | Nippon Telegr & Teleph Corp <Ntt> | 血流計及び血流計のセンサ部 |
JP2005040261A (ja) * | 2003-07-25 | 2005-02-17 | Waatekkusu:Kk | 脈波センサ |
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JP2005270545A (ja) | 2005-10-06 |
JP4476665B2 (ja) | 2010-06-09 |
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