WO2015141771A1 - センサ - Google Patents
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- WO2015141771A1 WO2015141771A1 PCT/JP2015/058216 JP2015058216W WO2015141771A1 WO 2015141771 A1 WO2015141771 A1 WO 2015141771A1 JP 2015058216 W JP2015058216 W JP 2015058216W WO 2015141771 A1 WO2015141771 A1 WO 2015141771A1
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- WIPO (PCT)
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- sensor
- weight body
- extending
- longitudinal direction
- main
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
- G01C19/5719—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces using planar vibrating masses driven in a translation vibration along an axis
- G01C19/5733—Structural details or topology
- G01C19/5755—Structural details or topology the devices having a single sensing mass
- G01C19/5762—Structural details or topology the devices having a single sensing mass the sensing mass being connected to a driving mass, e.g. driving frames
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B3/00—Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes
- B81B3/0035—Constitution or structural means for controlling the movement of the flexible or deformable elements
- B81B3/004—Angular deflection
- B81B3/0048—Constitution or structural means for controlling angular deflection not provided for in groups B81B3/0043 - B81B3/0045
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2201/00—Specific applications of microelectromechanical systems
- B81B2201/02—Sensors
- B81B2201/0228—Inertial sensors
- B81B2201/0242—Gyroscopes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2203/00—Basic microelectromechanical structures
- B81B2203/01—Suspended structures, i.e. structures allowing a movement
- B81B2203/0145—Flexible holders
- B81B2203/0154—Torsion bars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2203/00—Basic microelectromechanical structures
- B81B2203/01—Suspended structures, i.e. structures allowing a movement
- B81B2203/019—Suspended structures, i.e. structures allowing a movement characterized by their profile
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- 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
- G01P2015/0857—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 using a particular shape of the suspension spring
Definitions
- the present invention relates to a sensor capable of detecting angular velocity.
- An angular velocity sensor equipped with a vibration type sensor element is used to measure the running state of a car or the movement state of a robot.
- FIG. 10 is a view showing a conventional sensor element
- FIG. 10 (a) is a plan view
- FIG. 10 (b) is a cross-sectional view taken along line VI-VI in FIG. 10 (a).
- the sensor element shown in FIG. 1 includes a weight portion 101, a frame-shaped fixing portion 102 that surrounds the weight portion 101, a beam portion 103 that connects the weight portion 101 to the fixing portion 102, and a piezo formed on the beam portion 103. And a resistance element 104.
- the weight part 101, the fixing part 102, and the beam part 103 are integrally formed by processing a silicon substrate.
- Such a sensor element can detect the angular velocity in the three-axis directions of XYZ by the piezoresistive element 104 arranged in the beam portion 103 and the wiring connected thereto.
- Sensor sensors are required to further improve detection sensitivity. In order to improve the detection sensitivity, it is effective to reduce variations in sensitivity in the three-axis directions.
- a sensor includes a weight body, a frame body positioned so as to surround the weight body in a top view, a first end on the weight body, and a second end on the frame.
- a sensor having a flexible beam portion connected to a body, and a detection portion provided on the beam portion for detecting deformation of the beam portion as an electric signal.
- the beam portion protrudes from a main portion having a rectangular cross-sectional shape in a direction perpendicular to a longitudinal direction connecting the first end and the second end, and at least one of an upper surface and a lower surface of the main portion. And extending in the width direction perpendicular to the longitudinal direction when viewed from above.
- a sensor includes a weight body, a frame body positioned so as to surround the weight body in a top view, a first end on the weight body, and a second end on the weight body. It is a sensor having a flexible beam part connected to each frame and a detection part provided on the beam part for detecting deformation of the beam part as an electric signal.
- the beam portion includes a main portion extending in a longitudinal direction connecting the first end and the second end, and an extending portion protruding from the main portion to at least one of the upper side and the lower side,
- the amount of increase in the cross-sectional secondary moment in the thickness direction of the beam portion is larger than the amount of increase in the cross-sectional secondary moment in the plane direction of the beam portion.
- FIG. 9 is a cross-sectional view showing a step that follows FIG. 8.
- (A), (b) is the top view and sectional drawing which show the conventional sensor, respectively.
- FIG. 1 is a plan view of a sensor 100 according to an embodiment of the present invention
- FIG. 2 is a cross-sectional view taken along the line II of FIG. 3 is a cross-sectional view of the main part of the beam portion 30 taken along the line II-II in FIG.
- the sensor 100 is disposed on the frame body 10, the weight body 20 located inside the frame body 10, the beam portion 30 connecting the weight body 20 to the frame body 10, and the beam portion 30.
- a detection unit R that detects an electrical signal corresponding to the deformation.
- the sensor 100 can detect the angular velocity by rotating the weight body 20 in the XY plane.
- electrodes may be provided on the outer wall of the weight body 20 and the inner wall of the frame body 10 facing each other, and may be realized by electrostatic attraction. It may be realized by generating a magnetic force.
- a driving piezoelectric element may be disposed on a plurality of beam portions 30, and electrical signals may be sequentially input to the piezoelectric elements so that the beam portions 30 are sequentially deformed to be rotated.
- Coriolis force acts on the weight body 20, and the weight body 20 moves, so that the beam portion 30 is deformed to be twisted.
- an electrical signal corresponding to the deformation amount of the beam portion 30 is detected by the detection unit R, and the angular velocity can be detected by taking out and calculating the electrical signal by an electrical wiring (not shown).
- the sensor 100 can also detect acceleration.
- acceleration When acceleration is applied to the sensor 100, a force corresponding to the acceleration acts on the weight body 20, and the beam section 30 is bent as the weight body 20 moves.
- the acceleration can be detected by detecting an electrical signal corresponding to the amount of deflection of the beam portion 30 by the detection unit R, and extracting and calculating the electrical signal by an electrical wiring (not shown).
- an electrical wiring not shown
- the weight body 20 has a substantially square planar shape.
- the weight body 20 shown in this example has a different planar shape between a portion connected to a beam portion 30 described later and a portion located below the beam portion 30.
- the part connected to the beam part 30 of the weight body 20 and the part located below are arranged so that the centers overlap each other.
- part located below is shown with the broken line.
- the size of the part connected to the beam portion 30 of the weight body 20 is set such that the length of one side of the substantially square is 0.25 mm to 0.5 mm, for example.
- the thickness of this part is set to 5 ⁇ m to 20 ⁇ m, for example.
- the size of the portion located below is set such that the length of one side of the substantially square is 0.4 mm to 0.65 mm, for example.
- the thickness is set to 0.2 mm to 0.625 mm, for example.
- the part connected to the beam part 30 and the part located below among such weight bodies 20 may be joined by another member.
- the part connected to the beam part 30 in the weight body 20, the part located below, and the joining part for joining both are integrally formed by processing an SOI (Silicon on Insulator) substrate.
- the bonding portion is composed of an oxide layer between silicon (Si).
- the joining part has substantially the same planar shape as the part connected to the beam part 30.
- part is small compared with the site
- a frame-like frame body 10 is provided so as to surround such a weight body 20.
- the frame 10 has a substantially square planar shape, and has a substantially square opening that is slightly larger than the weight body 20 at the center.
- the length of one side of the frame body 10 is set to 1.4 mm to 3.0 mm, for example, and the width of the arm constituting the frame body 10 (width in the direction orthogonal to the longitudinal direction of the arm) is, for example, 0.3 mm to It is set to 1.8 mm.
- the thickness of the frame 10 is set to 0.2 mm to 0.625 mm, for example.
- a beam portion 30 is provided between the frame body 10 and the weight body 20.
- the beam portion 30 has a first end 31 that is one end connected to a central portion on the upper surface side of each side of the weight body 20, and a second end 32 that is the other end is the upper surface of each side on the inner periphery of the frame body 10. It is connected to the side center.
- four beam portions 30 are provided, and two of the four beam portions 30 extend in the X-axis direction and have the same straight line with the weight body 20 interposed therebetween. The other two are arranged in the same straight line extending in the Y-axis direction and sandwiching the weight body 20 therebetween.
- the direction connecting the first end 31 and the second end 32 of the beam portion 30 is referred to as a longitudinal direction. That is, in FIGS. 1 and 2, two longitudinal directions located on the upper side (+ Y side) and the lower side ( ⁇ Y side) of the weight body 20 among the four beam portions 30 are the Y-axis direction, The two longitudinal directions located on the right side (+ X side) and the left side ( ⁇ X side) of the weight body 20 are the X-axis direction.
- the beam portion 30 has a main portion 33 and an extending portion 34.
- the main portion 33 is a square member whose cross-sectional shape in the cross-sectional direction perpendicular to the longitudinal direction of the beam portion 30 is rectangular.
- the extending portion 34 is a portion that protrudes from at least one of the upper surface and the lower surface of the main portion 33.
- the extending portion 34 extends in the longitudinal direction of the beam portion 30 or is disposed so as to extend in the width direction orthogonal to the longitudinal direction of the beam portion 30 when viewed from above.
- the width direction of the beam portion 30 is the Y-axis direction when the longitudinal direction of the beam portion 30 is the X-axis direction, and the width direction of the beam portion 30 is when the longitudinal direction of the beam portion 30 is the Y-axis direction.
- the width direction is the X-axis direction.
- Extending in the longitudinal direction means a shape in which the length in the longitudinal direction is longer than the length in the width direction.
- extending in the width direction means a shape in which the length in the width direction is longer than that in the longitudinal direction. 1 to 3, the extending part 34 shows an example extending in the width direction of the beam part 30.
- the beam portion 30 is formed, for example, by processing an SOI substrate. That is, the main portion 33 is formed by processing a Si layer, and the extending portion 34 is formed by processing an oxide layer and a Si substrate called a handle substrate into a desired shape.
- the joint surface 34a with the main portion 33 is constituted by the upper surface of the oxide layer. A part of the oxide layer constituting the SOI substrate and a part of the Si substrate extend downward from the bonding surface 34a.
- the extended portion 34 can be formed into a desired shape by a part of the oxide layer and a part of the Si substrate.
- the beam portion 30 has flexibility as described above, the weight body 20 moves when acceleration is applied to the sensor 100, and the beam portion 30 bends as the weight body 20 moves.
- the beam portion 30 is shaped so as to increase the cross-sectional secondary moment in the thickness direction as compared with a rectangular body having a uniform cross-sectional shape in the direction perpendicular to the longitudinal direction, such as the main portion 33.
- the thickness is increased at the first end 31 or the second end 32 of the beam portion 30 as shown in FIG.
- the thickness is increased at the second end 32. That is, the beam portion 30 is partially thick at the portion where the extending portion 34 is arranged in this way.
- detection portions Rx1 to Rx4, Ry1 to Ry4, Rz1 to Rz4, which are resistance elements, are formed on the upper surface of the beam portion 30 (hereinafter, when these resistance elements are collectively referred to) Where appropriate, represented by the symbol R).
- the detectors Rx1 to Rx4, Ry1 to Ry4, Rz1 to Rz4 are accelerations in three axes directions (X axis direction, Y axis direction, Z axis direction in the three-dimensional orthogonal coordinate system shown in FIG. 1), and about three axes.
- the beam portion 30 is formed at a predetermined position and then connected so as to constitute a bridge circuit.
- Such a detection unit R can be formed, for example, by forming a resistor film by implanting boron into the uppermost layer of the SOI substrate and then patterning the resistor film into a predetermined shape by etching or the like. Thereby, the detection part R which consists of a piezoresistive element can be formed.
- These wirings are made of, for example, aluminum, an aluminum alloy, or the like. After these materials are formed by sputtering or the like, they are patterned into a predetermined shape, whereby the upper surface of the frame body 10, the weight body 20, or the beam portion 30 is formed. Formed.
- the senor 100 having such a configuration, it is possible to provide a sensor with little variation in detection sensitivity in three axes.
- the mechanism will be described below.
- the beam portion 30 is configured to be greatly deformed in the Z direction compared to the XY direction because of the shape and fixing method in which the extension length in the Z direction is the smallest among the three axes. That is, the resonance frequency in the Z direction when the beam portion 30 is vibrated has a large difference from the values in the X direction and the Y direction, and is extremely smaller than the values in the X direction and the Y direction. It has been confirmed that there is no large difference in the resonance frequency between the X direction and the Y direction.
- the extending part 34 by providing the extending part 34, the sectional secondary moment in the Z direction is increased, and as a result, the resonance frequency in the Z direction is brought close to the resonance frequency in the X direction and the Y direction. Can do. Thereby, it is possible to obtain a sensor with small variations in detection sensitivity in the three axes of XYZ.
- the beam portion 30 has a shape that gradually increases in thickness toward the frame body 10 at the second end 32 on the connection portion side with the frame body 10. Further, the second joint surface 34b is provided and fixed to the frame body 10 as well. That is, the resistance to displacement in the Z direction is increased at the base of the beam portion 30. Thereby, the displacement to the Z direction of the whole beam part 30 can be suppressed, and the resonant frequency in a Z direction can be raised.
- the frame body 10, the weight body 20, and the beam portion 30 may be integrally formed as in the present embodiment.
- the sensor has high strength and high reliability.
- the weight body 20 is rotated to detect the angular velocity has been described as an example.
- the beam portion 30 may be periodically vibrated.
- the extended portion 34 is provided on the lower surface of the main portion 33 on the second end 32 side has been described as an example, but other configurations may be employed.
- the extending part 34 may be provided on the first end 31 side, or the extending part 34 may be provided on both the first end 31 and the second end 32 side.
- the extending portion 34 may be provided only in the vicinity of the central portion in the longitudinal direction excluding the first end 31 side and the second end 32 side.
- the extending part 34 is not only joined to the main body 33 but also to the side surface of the frame body 10, but may not be joined to the side surface of the frame body 10. . Further, the extending part 34 may be located at the end part on the first end 31 side and may be joined to the side surface of the weight body 20. When the extending portion 34 is joined to the side surface of the frame body 10 or when the extending portion 34 is joined to the side surface of the weight body 20, the secondary moment in the Z direction can be further increased. At the same time, the beam portion 30 can be reinforced more effectively.
- the extension portion 34 has been illustrated as extending from one end portion in the width direction of the main portion 33 to the other end portion.
- the extending part 34A may be formed only in the center part in the width direction of the main part 33A (not reaching the end part).
- the cross section may be a triangular shape other than the rectangular shape, or may be a polygonal shape or a shape including a curve.
- 4A and 4B are cross-sectional views in the same direction as FIG. That is, it is a YZ cross section of the beam portion 30A along the line II-II in FIG.
- the extending part 34 is formed in the region overlapping the main part 33 in a top view is described, but the present invention is not limited to this example.
- the extending portion 34 may have a portion extending outside the region overlapping the main portion 33.
- the extending portion 34 extends in the width direction of the beam portion 30.
- the extending portion 34D extends in the longitudinal direction of the beam portion 30D.
- FIG. 5 is a plan view of a sensor 200 as a modification, and the same components as those in FIG. 6 is a cross-sectional view of the main part of the beam portion 30D taken along the line III-III in FIG.
- FIG. 5 shows an example in which the extending portion 34D extends from one end portion (first end) in the longitudinal direction of the main portion 33D to the other end portion (second end).
- the main portion 33D may be formed only at the central portion in the longitudinal direction (not reaching the first end and the second end).
- the cross-sectional secondary moment in the plane direction is lowered, The cross-sectional secondary moment in the thickness direction can be increased.
- FIG. 7A is a top view of a main part showing a modification of the beam part 30, and FIG. 7B is a cross-sectional view of the main part taken along the line IV-IV in FIG. 7A.
- FIG. 8 is a cross-sectional view of main parts taken along line VV in FIG.
- the beam portion 30 ⁇ / b> C has a narrow portion having a short length in the width direction at the end portion on the second end 32 side (frame portion 10 side).
- the cross-sectional secondary moment in the plane direction can be reduced.
- the secondary moment of the section in the thickness direction is increased by the extending portion 34C.
- the cross-sectional secondary moment in the plane direction with a high resonance frequency is reduced, and the cross-sectional secondary moment in the thickness direction with a low resonance frequency is increased.
- the cross-sectional shape in the plane perpendicular to the longitudinal direction on the second end 32 side of the beam portion 30C is smaller than the cross-sectional shape in the vicinity of the center, but remains rectangular.
- a shape other than a rectangular shape in which a side surface shape in the thickness direction is recessed inward may be used.
- the extending portion 34C extends from the main portion 33C has been shown, it may extend from a shape portion other than the rectangular shape.
- the weight body 20 is substantially square when viewed from above, but is not limited to this shape.
- a circular shape, a rectangular shape, or a shape in which an appendage is added to a square corner may be used.
- the detection unit R is described as being formed by a piezoresistor.
- the present invention is not limited to this as long as the deformation of the beam unit 30 can be detected.
- the detection unit R may be an electrode, and the magnitude of the deflection / deformation of the beam unit 30 or the direction of the deflection / deformation may be detected as an electric signal according to a change in capacitance.
- a fixed part disposed at a distance from the beam part 30 is newly provided, and an electrode facing the detection part R is provided on the fixed part. Then, the capacitance on the fixed part side and the detection part R may be made to function as a pair of electrodes and measured.
- the beam portion 34 has an example in which the cross-sectional shape in the direction perpendicular to the longitudinal direction is rectangular, but the present invention is not limited to this. That is, the beam portion has a main portion extending in the longitudinal direction and an extending portion projecting from the main portion to at least one of the upper side and the lower side, and a member composed only of the main portion is used as a reference.
- the increase amount of the cross-sectional secondary moment in the thickness direction of the beam portion only needs to be larger than the increase amount of the cross-sectional secondary moment in the plane direction of the beam portion.
- the shape of the extending portion in this case, the shapes of the various extending portions described above can be adopted.
- FIGS. 8A and 8B are cross-sectional views corresponding to the cross section taken along the line II of FIG. 1, and FIG. 8C is a top view.
- 9 is a cross-sectional view corresponding to a cross section taken along line II of FIG.
- the resistor film 51 is formed on the upper surface of the substrate 50.
- Substrate 50 is, for example, a SOI substrate having a first layer 50a made of Si, and the second layer 50b made of SiO 2, a layered structure in which a third layer 50c formed of Si are laminated in this order.
- the thickness of each layer is about 10 ⁇ m for the first layer 50a, about 1 ⁇ m for the second layer 50b, and about 500 ⁇ m for the third layer 50c.
- the resistor film 51 is formed by implanting boron, arsenic, or the like into the main surface of the first layer 50a of the substrate 50 made of such an SOI substrate by ion implantation.
- the resistor film 51 has an impurity concentration of 1 ⁇ 10 18 atms / cm 3 on the surface of the first layer 50a and a depth of about 0.5 ⁇ m.
- the resistor film 51 exposed from the resist film is removed by etching such as RIE etching. Thereafter, the detection portion R is formed on the upper surface of the substrate 50 by removing the resist film.
- wiring (not shown) and element-side electrode pads connected to the detection unit R are formed.
- the wiring and the element-side electrode pad are formed by, for example, forming a metal material such as aluminum by sputtering and then patterning it into a predetermined shape by dry etching or the like.
- the first layer 50a is patterned into a desired shape from the first layer 50a side of the substrate 50 (first patterning step). That is, a frame-shaped first region A1, a second region A2 located inside the first region A1, a beam-like third region A3 connecting the first region A1 and the second region A2 are determined, and the first layer Of the region 50a, the regions excluding the first to third regions A1, A2, A3 are removed.
- the detection unit R is arranged in the third region A3.
- an annular groove 58 that forms a closed space in a plan view is formed inside the first region A ⁇ b> 1 from the third layer 30 c side of the substrate 50.
- This groove 58 is provided between the first region A1 and the second region A2, and is formed so as to expose the lower surface of the first layer 50a by removing the third layer 50c and the second layer 50b at the corresponding part.
- the frame body 10 is formed which is formed of a stacked body of the first layer 50a, the second layer 50b, and the third layer 50c that exists continuously from the outer peripheral portion of the substrate 50. In other words, the frame 10 is separated from the other parts by the grooves 58.
- the third layer 50c is partially left so as to be continuous from the side surface of the frame body portion 10, and the second layer 50b is partially left.
- the layer 50c and the second layer 50b are removed.
- a part of the third layer 50 c and a part of the second layer 50 b remaining continuously from the side surface of the frame body 10 become the extending part 34 of the beam part 30.
- the second layer 50b is removed in a region reaching the second region A2 from the inside of the first region A1 in plan view from the third layer 50c side of the substrate 50, and the first layer 50a and the third layer 50c are removed.
- a gap 59 is formed between the two.
- the first layer 50a in the third region A3 is separated from other portions in the thickness direction, and the beam-shaped beam portion 30 is formed.
- One end (second end 32) of the beam portion 30 is connected by being integrally formed with the first layer 50a of the first region A1 (frame body 10).
- the other end (first end 31) of the beam portion 30 is connected by being formed integrally with the first layer 50a of the second region A2 (weight body 20).
- the first layer 50a and the second layer 50b are located on the inner side of the gap 59 in plan view, and the third layer 50c is located on the inner side of the groove 58 in plan view.
- a weight body 20 is formed.
- the second layer 50 b located inside the gap 59 in plan view functions as the bonding portion 24.
- a part of the third layer 50 c in the thickness direction may be removed so that the lower surface is positioned above the lower surface of the frame body 10.
- the senor 100 is originally formed by processing the integrated substrate 50. Therefore, since the gravity center position of the weight body 20 can be set to a desired position with high accuracy, the sensor 100 with stable accuracy can be provided with high productivity.
- the resistor film 51 is formed and then processed using the example in which the resistor film 51 is processed to have the desired shape of the atmospheric pressure detection unit Rp and the acceleration detection unit Ra.
- the resist film is formed on the upper surface of 50a, the resist film in the region where the detection part R is to be formed is removed, and the detection part R is formed by diffusing impurities only at a desired position (resist film opening). Also good.
- the detection unit R is flush with the upper surface of the substrate 50, and there is no step, so that the electrical connection of the wiring connected to the detection unit R is facilitated.
- Length in the longitudinal direction of the main portion 33D and the extending portion 34D (length in the X direction): 300 ⁇ m Width of main part 33D (length in the Y direction): 100 ⁇ m The thickness of the main part 33D (length in the Z direction): 20 ⁇ m The width of the extending portion 34D (the length in the Y direction): 3 ⁇ m Extension part 34D thickness (Z-direction length): 50 ⁇ m Attachment position of extension part 34D: Center of width direction of main part 33D (Y direction center)
- the cross-sectional secondary moment and resonance frequency in the Y direction and Z direction in the case where only the main portion 33D is configured were calculated by simulation.
- the cross-sectional secondary moment in the Y direction (plane direction) is reduced compared to the comparative example, and the cross-sectional secondary moment in the Z direction (thickness direction) is reduced. It can be enlarged.
- the resonant frequency of a plane direction and a thickness direction could be brought close, and the gap of a sensitivity could be suppressed by a plane direction and a thickness direction.
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Abstract
Description
上述の例では、延在部34として、主部33のうち第2端32側の下面に設けた場合を例に説明したが、他の構成としてもよい。例えば、第1端31側に延在部34を設けてもよいし、第1端31および第2端32側の双方に延在部34を設けてもよい。さらに、第1端31側および第2端32側を除く長手方向の中央部付近のみに延在部34を設けてもよい。
上述の例では、梁部30の長手方向の全領域において、主部33の長手方向に垂直な面における断面形状が一様な場合を例に説明したが、この例には限定されない。例えば、主部33の長手方向に垂直な面における断面形状が矩形状以外の部分を有していてもよい。また、主部の断面形状が一定でなくてもよい。例えば、矩形状の断面積の大きさが変化するような形状としてもよい。
上述の例では重錘体20をSOI基板を加工して形成したが、別体を接続して形成してもよい。その場合には、より密度の高い材料を用いることにより、同じ加速度でも生じる力を大きくし、それに伴い梁部30の撓み量を大きくすることができる。これにより、さらに感度の高いセンサを提供することができる。
次に、上述のセンサ100の製造方法について、図8~図9を用いて説明する。
なお、図8(a)および図8(b)は、図1のI-I線における断面に相当する断面図であり、図8(c)は、上面図である。図9は、図1のI-I線における断面に相当する断面図である。
まず、図8(a)に示すように、基板50の上面に抵抗体膜51を形成する。基板50は、例えばSOI基板であり、Siからなる第1層50aと、SiO2からなる第2層50bと、Siからなる第3層50cとがこの順に積層された積層構造を有する。各層の厚みは、第1層50aが10μm程度、第2層50bが1μm程度、第3層50cが500μm程度である。
次に、検出部Rが形成された基板50を加工することにより、重錘体20、重錘体20を囲むような枠体10および検出部Rを有し、第1端31が重錘体20に、第2端が枠体10にそれぞれ連結される梁部30を形成する。
上述の例では、抵抗体膜51を形成した後に、抵抗体膜51を所望の形状の気圧検出部Rpおよび加速度検出部Raとなるように加工した例を用いて説明したが、予め第1層50aの上面にレジスト膜を形成し、検出部Rを形成する領域のレジスト膜を除去して、所望の位置(レジスト膜開口部)のみに不純物を拡散させることにより、検出部Rを形成してもよい。この場合には、検出部Rが基板50の上面と同一面となり、段差がなくなるので、検出部Rに接続する配線の電気的接続が容易となる。
主部33Dの幅(Y方向の長さ):100μm
主部33Dの厚み(Z方向の長さ):20μm
延在部34Dの幅(Y方向の長さ):3μm
延在部34Dの厚み(Z方向の長さ):50μm
延在部34Dの取り付け位置:主部33Dの幅方向の中心(Y方向中心)
実施例
Y方向の断面二次モーメント:1.43e-18μm4
Y方向の共振周波数 :999kHz
Z方向の断面二次モーメント:1.78e-18μm4
Z方向の共振周波数 :1115kHz
Y方向の断面二次モーメント:1.67e-18μm4
Y方向の共振周波数 :1489kHz
Z方向の断面二次モーメント:6.7e-20μm4
Z方向の共振周波数 :297kHz
20 重錘体
30 梁部
31 第1端
32 第2端
33 主部
34 延在部
34a 接合面
R 検出部
100 センサ
Claims (12)
- 重錘体と、上面視して該重錘体を囲むように位置する枠体と、第1端が前記重錘体に、第2端が前記枠体にそれぞれ連結された可撓性を有する梁部と、該梁部に設けられた、該梁部の変形を電気信号として検出する検出部とを有するセンサであって、
前記梁部は、前記第1端と前記第2端とを結ぶ長手方向に対して垂直な方向における断面形状が矩形状の主部と、該主部の上面および下面の少なくとも一方から突出して、前記長手方向に延びるか、または上面視して前記長手方向に対して直交する幅方向に延びる延在部とを有するセンサ。 - 前記延在部は、前記第2端側において前記主部と前記枠体の側面との双方に接合されている、請求項1に記載のセンサ。
- 前記延在部は、前記第1端側において前記主部と前記重錘体の側面との双方に接合されている、請求項1または2に記載のセンサ。
- 前記主部は、前記長手方向の一部に前記幅方向の長さが他の部位よりも短くなっている幅狭部を有している、請求項1乃至3のいずれかに記載のセンサ。
- 前記幅狭部に前記延在部が位置している、請求項4に記載のセンサ。
- 前記幅狭部は、前記第1端側の端部および前記第2端側の端部の少なくとも一方に位置している、請求項4または5に記載のセンサ。
- 重錘体と、上面視して該重錘体を囲むように位置する枠体と、第1端が前記重錘体に、第2端が前記枠体にそれぞれ連結された可撓性を有する梁部と、該梁部に設けられた、該梁部の変形を電気信号として検出する検出部とを有するセンサであって、
前記梁部は、前記第1端と前記第2端とを結ぶ長手方向に延びる主部と、該主部から上側および下側の少なくとも一方へ突出している延在部とを有し、前記主部のみで構成される部材を基準としたときに、前記梁部の厚み方向における断面二次モーメントの増加量が、前記梁部の平面方向における断面二次モーメントの増加量よりも大きくなっているセンサ。 - 前記延在部は、前記第2端側において前記主部と前記枠体の側面との双方に接合されている、請求項7に記載のセンサ。
- 前記延在部は、前記第1端側において前記主部と前記重錘体の側面との双方に接合されている、請求項7または8に記載のセンサ。
- 前記主部は、前記長手方向の一部に前記幅方向の長さが他の部位よりも短くなっている幅狭部を有している、請求項7乃至9のいずれかに記載のセンサ。
- 前記幅狭部に前記延在部が位置している、請求項10に記載のセンサ。
- 前記幅狭部は、前記第1端側の端部および前記第2端側の端部の少なくとも一方に位置している、請求項10または11に記載のセンサ。
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JP2016508786A JP6294463B2 (ja) | 2014-03-20 | 2015-03-19 | センサ |
EP15765000.3A EP3121561B1 (en) | 2014-03-20 | 2015-03-19 | Sensor |
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US10444015B2 (en) | 2019-10-15 |
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