WO2007020700A1 - 加速度センサ装置およびセンサ装置 - Google Patents
加速度センサ装置およびセンサ装置 Download PDFInfo
- Publication number
- WO2007020700A1 WO2007020700A1 PCT/JP2005/015096 JP2005015096W WO2007020700A1 WO 2007020700 A1 WO2007020700 A1 WO 2007020700A1 JP 2005015096 W JP2005015096 W JP 2005015096W WO 2007020700 A1 WO2007020700 A1 WO 2007020700A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acceleration sensor
- substrate
- silicon
- sensor device
- thermal expansion
- Prior art date
Links
- 230000001133 acceleration Effects 0.000 title claims abstract description 89
- 239000000758 substrate Substances 0.000 claims abstract description 59
- 230000008646 thermal stress Effects 0.000 claims abstract description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 40
- 229910052710 silicon Inorganic materials 0.000 claims description 40
- 239000010703 silicon Substances 0.000 claims description 40
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 36
- 239000011521 glass Substances 0.000 claims description 23
- 239000000853 adhesive Substances 0.000 claims description 17
- 230000001070 adhesive effect Effects 0.000 claims description 17
- 239000004593 Epoxy Substances 0.000 claims description 10
- 230000005389 magnetism Effects 0.000 claims description 2
- 230000003139 buffering effect Effects 0.000 abstract 1
- 230000006866 deterioration Effects 0.000 description 11
- 230000008602 contraction Effects 0.000 description 8
- 239000000919 ceramic Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/02—Housings
- G01P1/023—Housings for acceleration measuring devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/006—Details of instruments used for thermal compensation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/12—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by alteration of electrical resistance
- G01P15/123—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by alteration of electrical resistance by piezo-resistive elements, e.g. semiconductor strain gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/18—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration in two or more dimensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P2015/0805—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration
- G01P2015/0822—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining out-of-plane movement of the mass
- G01P2015/084—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining out-of-plane movement of the mass the mass being suspended at more than one of its sides, e.g. membrane-type suspension, so as to permit multi-axis movement of the mass
Definitions
- the present invention relates to an acceleration sensor device that detects acceleration and a sensor device that includes a plurality of sensors.
- acceleration sensor has been used in an airbag system or the like mounted on an automobile.
- accelerometers have come to be installed in small information terminals such as mobile phones due to miniaturization and power saving of accelerometers!
- Piezoresistive acceleration sensors using the piezoresistive effect are known as one of the forces for which various methods have been proposed as the operating principle of the acceleration sensor.
- a piezoresistive-type calorie velocity sensor a silicon substrate is processed by etching to form a structure including a weight part, a beam part that supports the weight part, and a frame that supports the beam part.
- a piezoresistor whose resistance value changes when stress is applied is formed.
- the acceleration sensor element is integrally joined to the upper surface of the pedestal formed of glass to constitute an acceleration sensor chip. When acceleration is applied to the acceleration sensor chip, the beam portion is squeezed by the inertial force of the weight portion, and the resistance value of the piezoresistor changes, so that an electrical signal corresponding to the acceleration can be taken out.
- Such an acceleration sensor chip has a larger thermal expansion coefficient difference than silicon, and when mounted on a substrate made of a material such as glass epoxy, thermal stress is caused by thermal expansion or contraction due to temperature changes in the external environment. Occurs, the acceleration sensor chip is distorted, and the output characteristics deteriorate.
- Patent Document 1 discloses an example in which an acceleration sensor chip is mounted on a ceramic substrate having a thermal expansion coefficient close to that of silicon.
- Patent Document 1 Japanese Patent Laid-Open No. 10-12805
- the present invention has been made in view of such circumstances, and an object thereof is to provide an acceleration sensor device and a sensor device that can suppress deterioration of output characteristics due to thermal expansion or thermal contraction. .
- an acceleration sensor device supports a substrate, an acceleration sensor element including a weight portion that swings according to applied acceleration, and the acceleration sensor element.
- An acceleration sensor device comprising an acceleration sensor chip having a pedestal portion, and a buffer that absorbs thermal stress generated when the pedestal portion and the substrate are thermally expanded or contracted between the pedestal portion and the substrate. A member is provided.
- the buffer member provided between the pedestal portion and the substrate absorbs thermal stress generated when the thermal expansion or thermal contraction occurs. Even if there is a difference in the thermal expansion coefficient between the base part of the acceleration sensor chip and the substrate, the buffer member can suppress the distortion of the acceleration sensor chip and suppress the deterioration of the output characteristics. Get higher.
- the thermal expansion coefficient of the buffer member may be substantially the same as the thermal expansion coefficient of the pedestal! By making the thermal expansion coefficients of the buffer member and the pedestal portion substantially the same, it is possible to suitably absorb thermal stress and prevent deterioration of output characteristics.
- the substrate is a glass epoxy substrate
- the pedestal portion is formed using silicon or glass having a thermal expansion coefficient close to that of silicon or silicon
- the buffer member is made of glass having a thermal expansion coefficient close to that of silicon or silicon. It may be formed! Even when using a glass substrate whose thermal expansion coefficient is more than 10 times that of silicon, the buffer material using glass absorbs thermal stress and prevents deterioration of output characteristics near the thermal expansion coefficient of silicon or silicon. Can do. Since the glass epoxy substrate is cheaper than the ceramic substrate, the manufacturing cost of the acceleration sensor device can be reduced.
- the pedestal portion and the buffer member are fixed using a silicon-based adhesive, and the buffer member, the substrate, May be fixed using a silicon-based adhesive.
- generation of thermal stress due to thermal expansion or contraction of the adhesive can be suppressed, and deterioration of output characteristics can be more preferably suppressed.
- the sensor device includes the acceleration sensor device described above, a magnetic sensor that detects magnetism, and a pressure sensor that detects pressure.
- a sensor device in which a plurality of sensors are integrated can be configured. Since the degree of freedom in selecting the substrate is increased, a cheaper substrate can be selected, and the manufacturing cost of the sensor device can be reduced.
- FIG. 1 is a cross-sectional view of an acceleration sensor device according to an embodiment of the present invention.
- FIG. 2 is a perspective view of an acceleration sensor chip.
- FIG. 3 (a) is a diagram showing a sensor device in which a plurality of types of sensors are packaged in one package, and (b) is a cross-sectional view taken along the line BB ′ of the sensor device shown in (a). .
- FIG. 1 is a cross-sectional view of an acceleration sensor device 10 that works according to an embodiment of the present invention.
- the acceleration sensor device 10 is a BGA (Ball Grid Array) type acceleration sensor device.
- the acceleration sensor device 10 is mounted on a small information terminal such as a mobile phone, and is used for applications such as detecting the inclination of the small information terminal by detecting acceleration in three axis directions.
- an acceleration sensor chip 20 and a signal processing chip 40 are mounted on a package 15 including a substrate 12 and a cap 14.
- the substrate 12 has circuit wiring (not shown) formed on the upper surface and inside the substrate.
- a plurality of solder balls 38 functioning as external terminals for inputting / outputting acceleration signals and power supply voltages are formed on the lower surface of the substrate 12.
- the substrate 12 may be a glass epoxy substrate.
- FIG. 2 is a perspective view of the acceleration sensor chip 20.
- the acceleration sensor chip 20 shown in FIG. 1 is a cross section taken along the line AA ′ of FIG.
- the acceleration sensor chip 20 includes an acceleration sensor element 16 that is an element that detects acceleration, and a pedestal 18 that supports the acceleration sensor element 16.
- the acceleration sensor element 16 is formed by dry etching using silicon as a base material to form a structure body including a frame body 30, a beam part 26, and a weight part 28, and a piezoresistive element 42 is formed on the beam part 26. ing.
- the frame 30 is a base of the acceleration sensor chip 20, and is formed in a quadrangular shape.
- the beam portions 26 extend from the four inner surfaces of the frame body 30 toward the inner side of the frame body 30, and intersect each other near the center of the opening of the frame body 30.
- the thickness of the frame 30 is about 250 ⁇ m.
- the beam portion 26 is formed so that its upper surface is flush with the upper surface of the frame 30.
- the beam portion 26 may be formed such that the upper surface thereof also separates the upper surface force of the frame body 30. That is, the beam portion 26 may extend from a position between the upper surface and the lower surface of the inner side surface of the frame 30.
- the thickness of the beam portion 26 is formed to be thin so as to have elasticity, and is preferably formed to about 5 ⁇ m.
- the weight portion 28 swings in accordance with the magnitude of the applied acceleration, and changes the amount of stagnation of the beam portion 26.
- the weight portion 28 is formed at a portion where the four beam portions 26 intersect so as to extend downward from the lower surface of the beam portion 26.
- the weight portion 28 is a quadrangular prism-shaped lump.
- the piezoresistive element 42 converts the amount of sag when the beam portion 26 is deformed into an electrical signal.
- the piezoresistive element 42 is formed on the surface of the beam portion 26, and four elements per axis are arranged at a position where the stress is most concentrated on the beam portion 26, and a total of 12 elements are arranged on three axes.
- the signal proportional to the acceleration rate forms a Wheatstone bridge circuit with four elements on each axis, and detects resistance changes due to stress as voltage changes.
- the detected acceleration signal is output by 32 bonding pads.
- the pedestal 18 is formed of silicon or glass having a thermal expansion coefficient close to that of silicon.
- the coefficient of thermal expansion of silicon is about 3 X 10 _6 Z ° C, and the coefficient of thermal expansion is 2.5 to 4.5 X 10 _6 Z ° between glass and silicon that has a similar coefficient of thermal expansion. It is about C glass.
- the pedestal portion 18 is a rectangular flat plate, and as shown in FIG. 1, a part of the upper surface is dug to secure a space in which the weight portion 28 swings.
- the pedestal 18 is joined to the acceleration sensor element 16 by anodic bonding at the peripheral edge of the opening of the frame 30.
- the thickness of the pedestal 18 is about 250 ⁇ m.
- the signal processing chip 40 shown in FIG. 1 is integrated with a Wheatstone / bridge circuit force of the piezoresistive element 42 and a processing circuit for arithmetically processing an acceleration signal obtained for each axial direction. Further, although not shown in the figure, a storage element chip such as an EEPROM for storing data necessary for arithmetic processing may be provided.
- the acceleration sensor chip 20 and the signal processing chip 40 are mounted on the substrate 12 and are electrically connected via wires 34 and wiring (not shown) provided on the substrate 12.
- the acceleration sensor chip 20 and the signal processing chip 40 are sealed with a cap 14.
- the signal processing chip 40 is directly fixed to the substrate 12 via the adhesive 64.
- the acceleration sensor chip 20 has a gap between the pedestal 18 and the substrate 12.
- a buffer member 46 is provided for absorbing thermal stress generated when thermal expansion or contraction occurs.
- the buffer member 46 is a rectangular flat plate.
- the upper surface of the buffer member 46 is preferably formed to be at least the same size as the lower surface of the pedestal portion 18, and more preferably larger than the lower surface of the pedestal portion 18.
- the thickness of the buffer member 46 is about 100 m.
- the substrate 12 and the buffer member 46 are fixed via an adhesive 44, and the buffer member 46 and the pedestal 18 are fixed via an adhesive 48.
- the substrate 12 and the pedestal portion 18 thermally expand or contract due to a temperature change in the external environment.
- the substrate 12 for example, when using a glass epoxy substrate, Garasue epoxy because the thermal expansion coefficient is in 50 ⁇ 70 X 10 _6 Z ° C approximately and silicon 10 times or more, between the base plate 12 and the pedestal portion 18 Thermal stress is generated.
- the acceleration sensor element 16 joined to the pedestal 18 16 will bend and the resistance value of the piezoresistive element 42 will change. Output characteristics will deteriorate.
- the buffer member 46 provided between the pedestal portion 18 and the substrate 12 absorbs thermal stress and suppresses distortion of the pedestal portion 18. As a result, the stagnation of the beam portion 26 is suppressed and the change in the resistance value of the piezoresistive element 42 can be suppressed, so that the output characteristics of the acceleration sensor device 10 can be prevented from deteriorating.
- the acceleration sensor device 10 it was necessary to select a substrate having a thermal expansion coefficient close to that of the acceleration sensor chip 20 in order to prevent deterioration of output characteristics due to thermal stress.
- a substrate having a thermal expansion coefficient close to that of the acceleration sensor chip 20 when the acceleration sensor chip 20 is made of silicon and glass, a ceramic substrate having a thermal expansion coefficient close to that of silicon was used.
- the buffer member 46 by providing the buffer member 46, even if there is a difference in the thermal expansion coefficient between the acceleration sensor chip 20 and the substrate 12, the distortion of the acceleration sensor chip 20 is suppressed. Therefore, the degree of freedom in selecting the substrate 12 is increased. For example, since the glass epoxy substrate is less expensive than the ceramic substrate, the manufacturing cost of the acceleration sensor device 10 can be reduced.
- the thermal expansion coefficient of the buffer member 46 is substantially the same as the thermal expansion coefficient of the pedestal 18.
- the buffer member 46 is also preferably formed using glass or glass having a thermal expansion coefficient close to that of silicon.
- the thermal expansion coefficients of the buffer member 46 and the pedestal portion 18 are substantially the same, the thermal stress can be suitably absorbed and the deterioration of the output characteristics can be prevented.
- silicon is used as the buffer member 46, a silicon mirror wafer is used.
- the buffer member 46 can be formed by dicing into the following shape.
- the pedestal 18 and the buffer member 46 are fixed using a silicon-based adhesive, and the buffer member 46 and the substrate 12 are fixed using a silicon-based adhesive.
- a silicon-based adhesive it is possible to suppress deterioration of output characteristics due to the influence of the adhesive. Since the signal processing chip 40 does not have a mechanically varying portion, it is not necessary to provide a buffer member, and the type of the adhesive 64 is not limited.
- FIG. 3 (a) is a diagram showing a hybrid sensor device 100 in which a plurality of types of sensors are packaged.
- FIG. 3B is a cross-sectional view of the hybrid sensor device 100 shown in FIG.
- the hybrid sensor device 100 includes an acceleration sensor chip 20, a magnetic sensor chip 50 that detects geomagnetism, a pressure sensor chip 60 that detects pressure, and a signal processing chip 40 that processes signals output from these sensors. .
- the hybrid sensor device 100 is mounted on a small information terminal, for example, and the azimuth angle measured by the magnetic sensor chip 50 is corrected by the signal processing chip 40 using the inclination angle measured by the acceleration sensor chip 20, respectively.
- the sensors can cooperate to perform sensing. Since the hybrid sensor device 100 has a plurality of sensors in one package, a small sensor device 100 can be realized. In FIGS. 3A and 3B, illustration of wires for electrically connecting the chips is omitted.
- the buffer member 46 is provided between the substrate 12 and the acceleration sensor chip 20 in order to suppress deterioration of output characteristics due to temperature changes in the external environment.
- the signal processing chip 40, the magnetic sensor chip 50, and the like do not have a mechanically changing portion, they are directly fixed to the substrate 12 via an adhesive.
- the substrate of the entire sensor device is close to the thermal expansion coefficient of silicon, for example, a material such as ceramic.
- the degree of freedom of board selection is low.
- the buffer member 46 absorbs thermal stress generated between the substrate 12 and the base portion of the calorie velocity sensor chip 20. Even if it is a substrate made of a material such as glass epoxy having a thermal expansion coefficient larger than that of silicon, it can be used. As described above, since the glass epoxy substrate is less expensive than the ceramic substrate, the manufacturing cost of the hybrid sensor device 100 can be reduced.
- the present invention can be applied to the field related to acceleration sensor devices and sensor devices.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Pressure Sensors (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/990,501 US20090095076A1 (en) | 2005-08-18 | 2005-08-18 | Acceleration Sensor Device and Sensor Apparatus |
PCT/JP2005/015096 WO2007020700A1 (ja) | 2005-08-18 | 2005-08-18 | 加速度センサ装置およびセンサ装置 |
JP2007530883A JPWO2007020700A1 (ja) | 2005-08-18 | 2005-08-18 | 加速度センサ装置およびセンサ装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2005/015096 WO2007020700A1 (ja) | 2005-08-18 | 2005-08-18 | 加速度センサ装置およびセンサ装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007020700A1 true WO2007020700A1 (ja) | 2007-02-22 |
Family
ID=37757372
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/015096 WO2007020700A1 (ja) | 2005-08-18 | 2005-08-18 | 加速度センサ装置およびセンサ装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US20090095076A1 (ja) |
JP (1) | JPWO2007020700A1 (ja) |
WO (1) | WO2007020700A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017092115A (ja) * | 2015-11-04 | 2017-05-25 | セイコーエプソン株式会社 | 電子デバイスの製造方法、電子デバイス、電子機器および移動体 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10615111B2 (en) * | 2014-10-31 | 2020-04-07 | The Board Of Trustees Of The Leland Stanford Junior University | Interposer for multi-chip electronics packaging |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03125219U (ja) * | 1990-03-30 | 1991-12-18 | ||
JPH06160423A (ja) * | 1992-11-20 | 1994-06-07 | Hitachi Ltd | 容量式加速度検出器 |
JP2002098709A (ja) * | 2000-09-26 | 2002-04-05 | Matsushita Electric Works Ltd | 半導体加速度センサ |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6768196B2 (en) * | 2002-09-04 | 2004-07-27 | Analog Devices, Inc. | Packaged microchip with isolation |
-
2005
- 2005-08-18 WO PCT/JP2005/015096 patent/WO2007020700A1/ja active Application Filing
- 2005-08-18 JP JP2007530883A patent/JPWO2007020700A1/ja active Pending
- 2005-08-18 US US11/990,501 patent/US20090095076A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03125219U (ja) * | 1990-03-30 | 1991-12-18 | ||
JPH06160423A (ja) * | 1992-11-20 | 1994-06-07 | Hitachi Ltd | 容量式加速度検出器 |
JP2002098709A (ja) * | 2000-09-26 | 2002-04-05 | Matsushita Electric Works Ltd | 半導体加速度センサ |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017092115A (ja) * | 2015-11-04 | 2017-05-25 | セイコーエプソン株式会社 | 電子デバイスの製造方法、電子デバイス、電子機器および移動体 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2007020700A1 (ja) | 2009-02-19 |
US20090095076A1 (en) | 2009-04-16 |
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