WO2013187018A1 - 静電容量式物理量センサ - Google Patents
静電容量式物理量センサ Download PDFInfo
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- WO2013187018A1 WO2013187018A1 PCT/JP2013/003546 JP2013003546W WO2013187018A1 WO 2013187018 A1 WO2013187018 A1 WO 2013187018A1 JP 2013003546 W JP2013003546 W JP 2013003546W WO 2013187018 A1 WO2013187018 A1 WO 2013187018A1
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- detection
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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
- G01P15/135—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 making use of contacts which are actuated by a movable inertial mass
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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
- G01P15/125—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 capacitive pick-up
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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
- G01C19/574—Structural details or topology the devices having two sensing masses in anti-phase motion
- G01C19/5747—Structural details or topology the devices having two sensing masses in anti-phase motion each sensing mass being connected to a driving mass, e.g. driving frames
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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
- G01P15/0802—Details
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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
- G01P15/13—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 measuring the force required to restore a proofmass subjected to inertial forces to a null position
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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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- 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
- G01P2015/0862—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 particular means being integrated into a MEMS accelerometer structure for providing particular additional functionalities to those of a spring mass system
- G01P2015/0882—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 particular means being integrated into a MEMS accelerometer structure for providing particular additional functionalities to those of a spring mass system for providing damping of vibrations
Definitions
- the present disclosure is formed on a substrate, an anchor fixed to one surface of the substrate, a detection beam connected to the substrate through the anchor, a weight portion connected to the detection beam, and the weight portion.
- the present invention relates to a capacitance type physical quantity sensor including a movable electrode and a fixed electrode facing the movable electrode.
- Patent Document 1 a movable electrode formed on a weight, a fixed electrode facing the movable electrode, a first beam connected to the weight and displaceable according to acceleration
- a semiconductor acceleration sensor including a first stopper that regulates the amount of displacement of the first beam and a second beam that supports the first stopper.
- the first beam is composed of a plurality of beams having different spring constants, the displacement amount of each beam is regulated by the corresponding stopper, and the adjacent beam and the stopper are connected.
- the displacement amount of the first beam is regulated by the first stopper. Therefore, even when a strong impact such as a rear-end collision is applied, the acceleration generated at that time can be detected.
- the first beam is composed of a plurality of beams having different spring constants, the displacement amount of each beam is regulated by the corresponding stopper, and the adjacent beam and the stopper are connected. According to this, when the above-described strong impact is applied, there is a possibility that the weight on which the movable electrode is formed rotates and the posture of the weight fluctuates. When the posture of the weight varies, the facing area between the movable electrode and the fixed electrode varies, and the acceleration detection accuracy may be reduced.
- an object of the present disclosure is to provide a capacitance-type physical quantity sensor in which a decrease in physical quantity detection accuracy is suppressed by attitude control.
- a capacitance type physical quantity sensor includes a substrate whose one surface is along an xy plane defined by an x direction and a y direction that are orthogonal to each other; An anchor fixed to one surface of the substrate, a detection beam connected to the substrate via the anchor, a weight portion connected to the detection beam, a movable electrode formed on the weight portion, and the movable electrode And a fixed electrode opposed to each other in the xy plane, wherein the detection beam has flexibility in the y direction, and the movable electrode includes the first movable detection electrode, The second movable detection electrode and the first movable damping electrode are included.
- the fixed electrode includes the first fixed detection electrode, the second fixed detection electrode, and the first fixed damping electrode.
- the detection electrode is separated from the first movable detection electrode in the first y direction, which is one direction in the y direction.
- the second fixed detection electrode is located away from the second movable detection electrode in the second y direction, which is opposite to the first y direction.
- the second movable detection electrodes are opposed to each other in the second y direction, and each of the plurality of first movable damping electrodes is located at the center between the corresponding two first fixed damping electrodes, and one of the first fixed damping electrodes Are opposed to each other in the first y direction, and are opposed to each other in the second y direction, and the plurality of first movable damping electrodes are symmetric with respect to the center of the weight portion, or in the y direction. Along the center line passing through the center of the weight portion.
- the damping when a speed is applied in the y direction, the damping is generated between the first movable damping electrode and the first fixed damping electrode in the y direction of the weight portion. Excessive displacement is suppressed. Therefore, even when a strong impact such as a rear-end collision is applied, a physical quantity such as acceleration generated at that time can be detected.
- the plurality of first movable damping electrodes are point-symmetrical via the center of the weight part or line-symmetrical via a center line passing through the center of the weight part along the y direction. positioned.
- a capacitance type physical quantity sensor includes a substrate having one surface along an xy plane defined by an x direction and a y direction that are orthogonal to each other, and is fixed to the one surface of the substrate.
- Anchors detection beams connected to the substrate via the anchors, weights connected to the detection beams, movable electrodes formed on the weights, and the movable electrodes on the xy plane
- a capacitance type physical quantity sensor having fixed electrodes facing each other in the orthogonal z direction, and is configured as follows.
- the detection beam has flexibility in the z direction.
- the movable electrode includes a first movable detection electrode, a second movable detection electrode, and a first movable damping electrode.
- the fixed electrode includes a first fixed detection electrode, a second fixed detection electrode, and a first fixed damping electrode.
- the first fixed detection electrode is located away from the first movable detection electrode in the first z direction, which is one direction in the z direction, and faces the first movable detection electrode in the first z direction.
- the second fixed detection electrode is located away from the second movable detection electrode in the second z direction, which is opposite to the first z direction, and faces the second movable detection electrode in the second z direction.
- Each of the plurality of first movable damping electrodes is located in the center between the corresponding two first fixed damping electrodes, and one of the corresponding two first fixed damping electrodes and the first z direction Of the corresponding two first fixed damping electrodes and the other first fixed damping electrode in the second z direction.
- the plurality of first movable damping electrodes are positioned point-symmetrically through the center of the weight portion or line-symmetrically through a center line passing through the center of the weight portion along the z direction.
- FIG. 1 is a top view showing a schematic configuration of the acceleration sensor according to the first embodiment.
- 2 is a cross-sectional view taken along line II-II in FIG. 1 for detecting acceleration in the y direction.
- FIG. 3 is a top view showing a modification of the acceleration sensor.
- FIG. 4 is a top view showing another modification of the acceleration sensor.
- FIG. 5 is a top view showing another modification of the acceleration sensor.
- FIG. 6 is a top view showing a modification of the first movable damping electrode and the first fixed damping electrode.
- FIG. 7 is a top view showing another modification of the first movable damping electrode and the first fixed damping electrode.
- FIG. 8 is a top view showing another modification of the first movable damping electrode and the first fixed damping electrode.
- FIG. 9 is a cross-sectional view showing an acceleration sensor that detects acceleration in the z direction.
- FIG. 10 is a top view showing a schematic configuration of the first semiconductor layer and the fifth semiconductor shown in FIG.
- FIG. 11 is a top view showing a schematic configuration of the second semiconductor layer and the fourth semiconductor layer shown in FIG.
- FIG. 12 is a top view illustrating a schematic configuration of the third semiconductor layer illustrated in FIG. 9.
- FIG. 13 is a cross-sectional view for explaining a manufacturing process of the acceleration sensor shown in FIG.
- FIG. 14 is a cross-sectional view for explaining a manufacturing process of the acceleration sensor shown in FIG. 15 is a cross-sectional view for explaining a manufacturing process for the acceleration sensor shown in FIG.
- FIG. 16 is a cross-sectional view for explaining a process for manufacturing the acceleration sensor shown in FIG.
- FIG. 17 is a cross-sectional view for explaining a process for manufacturing the acceleration sensor shown in FIG. 18 is a cross-sectional view for explaining a manufacturing process for the acceleration sensor shown in FIG.
- FIG. 19 is a cross-sectional view for explaining a process for manufacturing the acceleration sensor shown in FIG. 20 is a cross-sectional view for explaining a manufacturing process of the acceleration sensor shown in FIG.
- FIG. 21 is a cross-sectional view for explaining a process for manufacturing the acceleration sensor shown in FIG.
- FIG. 22 is a cross-sectional view for explaining a process for manufacturing the acceleration sensor shown in FIG.
- FIG. 23 is a top view showing a modification of the third semiconductor layer.
- FIG. 24 is a top view showing another modification of the third semiconductor layer.
- FIG. 25 is a top view showing a modification of the second semiconductor layer and the fourth semiconductor layer.
- 26 is a cross-sectional view showing a modification of the acceleration sensor shown in FIG. 27 is a cross-sectional view showing another modification of the acceleration sensor shown in FIG.
- FIG. 28 is a cross-sectional view showing a detailed configuration of the acceleration sensor shown in FIG.
- FIG. 29 is a top view showing a schematic configuration of the angular velocity sensor.
- FIG. 1 Based on FIG.1 and FIG.2, the acceleration sensor which concerns on this embodiment is demonstrated.
- FIGS. 1 and 2 hatching is applied as necessary to clarify the configuration.
- two directions orthogonal to each other are indicated as an x direction and a y direction, and a plane defined by these two directions is indicated as an xy plane.
- a line passing along the center of the acceleration sensor 100 (center CP of the weight portion 17) along the y direction is indicated as a center line CL.
- the acceleration sensor 100 is formed by forming a fine structure on a semiconductor substrate 10.
- the semiconductor substrate 10 is an SOI substrate in which an insulating layer 13 is sandwiched between two semiconductor layers 11 and 12, and a sensor element 14 corresponding to the fine structure described above is formed on the semiconductor substrate 10.
- the first semiconductor layer 11 corresponds to an example of a substrate.
- the sensor element 14 is formed by etching the second semiconductor layer 12 and the insulating layer 13 into a predetermined shape using a known exposure technique.
- the sensor element 14 includes the floating portion 15 in which the second semiconductor layer 12 is floated with respect to the first semiconductor layer 11 without the insulating layer 13, and the first semiconductor layer 11 with respect to the first semiconductor layer 11. 2 and a fixing portion 16 to which the semiconductor layer 12 is fixed.
- the floating portion 15 includes a weight portion 17 that forms the center of mass, a movable electrode 18 formed on the weight portion 17, a fixed electrode 19 that faces the movable electrode 18, and a detection beam 20 that has a spring property in the y direction.
- the fixed portion 16 includes a first anchor 30 that supports the weight portion 17 via the detection beam 20 and a second anchor 31 that supports the fixed electrode 19.
- the second anchor 31 supports a third anchor 32 that supports a first fixed detection electrode 24 described later, a fourth anchor 33 that supports a second fixed detection electrode 25 described later, and a first fixed damping electrode 26 described later.
- a fifth anchor 34 is a fifth anchor 34.
- the weight portion 17 has two first rod portions 17a along the y direction and two second rod portions 17b along the x direction, and a frame in which the respective end portions are connected. It has a shape.
- the detection beam 20 is connected to the inner surface of each of the two second rod portions 17b constituting the weight portion 17, and each of the detection beams 20 is connected to the end portion of the first anchor 30 having a shape extending in the y direction. Yes.
- the weight portion 17 can be displaced in the y direction.
- acceleration along the y direction is applied to the acceleration sensor 100
- the weight portion 17 is displaced according to the magnitude of the applied acceleration, and the amount of displacement is converted into the capacitance of a detection capacitor described later. .
- This converted capacitance is output to an external element as an acceleration detection signal.
- the movable electrode 18 includes a first movable detection electrode 21, a second movable detection electrode 22, and a first movable damping electrode 23.
- a first movable detection electrode 21 whose longitudinal direction extends in the x direction is formed in a comb shape, and the other first rod is formed.
- the second movable detection electrode 22 whose longitudinal direction extends in the x direction is formed in a comb shape.
- the 1st movable damping electrode 23 which a longitudinal direction extends in ax direction on each outer surface of the two 1st rod parts 17a is formed in the comb-tooth shape.
- the plurality of first movable damping electrodes 23 are positioned point-symmetrically via the center CP of the weight portion 17 and are also positioned line-symmetrically via the center line CL in the present embodiment.
- the fixed electrode 19 has a first fixed detection electrode 24, a second fixed detection electrode 25, and a first fixed damping electrode 26.
- the first fixed detection electrode 24 whose longitudinal direction extends in the x direction is formed in a comb-tooth shape on the surface facing the first rod portion 17 a of the third anchor 32 having a shape extending in the y direction.
- the second fixed detection electrode 25 whose longitudinal direction extends in the x direction is formed in a comb-tooth shape on the surface of the fourth anchor 33 that is formed in the y direction and that faces the other first rod portion 17a.
- a first fixed damping electrode 26 whose longitudinal direction extends in the x direction is formed in a comb-teeth shape on the surface of the fifth anchor 34 having a frame shape facing the first rod portion 17a.
- the first fixed detection electrode 24 is located away from the corresponding first movable detection electrode 21 in the first y direction that is one direction of the y direction (the direction from the lower side of the paper to the upper side of the paper).
- the second fixed detection electrodes 25 are located away from the corresponding second movable detection electrodes 22 in the second y direction (the direction from the upper side of the paper toward the lower side of the paper), which is opposite to the first y direction.
- the first detection electrodes 21 and 24 having a comb shape are engaged with each other so as to face each other in the first y direction, thereby forming a plurality of first detection capacitors, and facing each other in the second y direction.
- a plurality of second detection capacitors are configured by the comb-shaped second detection electrodes 22 and 25 meshing with each other.
- the first movable damping electrode 23 is positioned at the center between the two first fixed damping electrodes 26, and is opposed to one first fixed damping electrode 26 in the first y direction, and the other first fixed damping electrode. 26 and the second y direction.
- the first movable damping electrode 23 and the first fixed damping electrode 26 are similar to each other, and the facing distance between the first movable damping electrode 23 and the first fixed damping electrode 26 is constant.
- the first detection electrodes 21 and 24 face each other in the first y direction
- the second detection electrodes 22 and 25 face each other in the second y direction. Therefore, when the weight portion 17 moves in the first y direction, the first detection electrodes 21 and 24 are displaced so as to approach each other, while the second detection electrodes 22 and 25 are displaced so as to be separated from each other. On the contrary, when the weight portion 17 moves in the second y direction, the first detection electrodes 21 and 24 are displaced away from each other, while the second detection electrodes 22 and 25 are displaced so as to approach each other. In this way, the increase and decrease of the capacitances of the first detection capacitor and the second detection capacitor are reversed. Based on the difference between the capacitances of these two detection capacitors, the acceleration in the y direction is detected.
- the first anchor 30 has a shape extending in the y direction, and the detection beams 20 are connected to both ends thereof.
- the anchors 32 and 33 each have a shape extending in the y direction, and fixed detection electrodes 24 and 25 are formed on the side surfaces thereof.
- the fifth anchor 34 has a frame shape, and the first fixed damping electrode 26 is formed on the inner surface thereof.
- a movable detection pad 30a for applying a constant voltage is formed in the center of the first anchor 30, and a first fixed detection pad for taking out the capacitance change of the first detection capacitor in the center of the third anchor 32. 32a is formed, and a second fixed detection pad 33a for taking out the capacitance change of the second detection capacitor is formed at the center of the fourth anchor 33.
- the fifth anchor 34 is formed with a damping pad 34a for applying a diagnostic voltage having a polarity different from that of the voltage applied to the movable detection pad 30a.
- the acceleration sensor 100 performs a normal operation for detecting acceleration and a failure diagnosis operation for diagnosing its own failure.
- a constant voltage is applied to the movable detection pad 30a, and the capacitance change of the detection capacitor caused by the application of acceleration is output from each of the fixed detection pads 32a and 33a.
- the damping pad 34a is connected to the ground in order to maintain the potential of the acceleration sensor 100.
- the first movable damping electrode 23 is formed on the weight portion 17 so as to be positioned point-symmetrically via the center CP of the weight portion 17, and the first movable damping electrode 23 is formed by two first fixed electrodes. It is located at the center between the damping electrodes 26 and faces one first fixed damping electrode 26 in the first y direction and faces the other first fixed damping electrode 26 in the second y direction. According to this, when a speed is applied in the y direction, excessive displacement in the y direction of the weight portion 17 is suppressed by damping that occurs between the first damping electrodes 23 and 26.
- the plurality of first movable damping electrodes 23 are positioned point-symmetrically via the center CP of the weight portion 17. Thereby, when the above-described strong impact is applied, the weight portion 17 is suppressed from rotating in the xy plane, and the posture of the weight portion 17 is controlled. Therefore, the displacement of the weight portion 17 in the x direction is suppressed, and fluctuations in the facing area between the first detection electrodes 21 and 24 and between the second detection electrodes 22 and 25 are suppressed. As a result, a decrease in acceleration detection accuracy is suppressed.
- the plurality of first movable damping electrodes 23 are also positioned symmetrically with respect to the center line CL. This also suppresses the rotation of the weight portion 17 in the xy plane, and the posture of the weight portion 17 is controlled. Therefore, a decrease in acceleration detection accuracy is suppressed.
- the first movable damping electrode 23 and the first fixed damping electrode 26 have a similar relationship, and the facing distance between the first movable damping electrode 23 and the first fixed damping electrode 26 is constant. According to this, the first movable damping electrode and the first fixed damping electrode are not similar, and the first movable damping electrode and the first fixed damping electrode are not similar to each other, and the first movable damping electrode and the first fixed damping electrode are indefinite. It is difficult for bias to occur in the damping generated between the damping electrode 23 and the first fixed damping electrode 26. Therefore, as compared with the comparative configuration described above, the weight portion 17 is suppressed from rotating in the xy plane, and the posture of the weight portion 17 is controlled. As a result, a decrease in acceleration detection accuracy is suppressed.
- a diagnosis voltage is applied to the damping pad 34a to displace the weight portion 17 in the y direction, thereby determining whether or not the acceleration sensor 100 has failed.
- the failure of the acceleration sensor 100 can be self-diagnosed by using the first damping electrodes 23 and 26 and the damping pad 34a.
- the embodiment of the present disclosure is not limited to the above-described embodiment, and includes variously modified embodiments without departing from the gist of the present disclosure.
- the first movable damping electrode 23 is formed on the outer surface of the first rod portion 17a, and the first fixed damping electrode 26 is formed on the fifth anchor 34 having a frame shape.
- the first movable damping electrode 23 is formed on the inner surface of the first rod portion 17a, and the first fixed damping electrode 26 is formed on the side surface of the fifth anchor 34 having a shape extending in the y direction. It is also possible to adopt the configuration described above.
- the 1st movable damping electrode 23 is formed in the outer surface of the 1st rod part 17a, and the 1st fixed damping electrode 26 is formed in the surface facing the 1st rod part 17a in the 5th anchor 34 which comprises frame shape.
- the example formed is shown.
- the second movable damping electrode 27 is formed on the outer surface of the second rod portion 17b, and the second rod in the fifth anchor 34 having a frame shape.
- a configuration in which the second fixed damping electrode 28 is formed on the surface facing the portion 17b can also be adopted.
- the second movable damping electrode 27 is located at the center between the two second fixed damping electrodes 28 and is in one direction with the second fixed damping electrode 28 in the first x direction (from the left side to the right side on the page). In the 2x direction (the direction from the right side of the drawing to the left side of the drawing) opposite to the other second fixed damping electrode 28.
- the plurality of second movable damping electrodes 27 are positioned point-symmetrically via the center CP of the weight portion 17. According to this, due to the damping that occurs between the second movable damping electrode 27 and the second fixed damping electrode 28, the weight portion 17 is more effective in the xy plane than the configuration described in the present embodiment. The rotation is suppressed and the posture of the weight portion 17 is controlled. As a result, a decrease in acceleration detection accuracy is further effectively suppressed.
- the weight portion 17 has two first rod portions 17a along the y direction and two second rod portions 17b along the x direction, and has a frame shape in which respective end portions are connected.
- An example is shown.
- the weight portion 17 may have a shape extending in the y direction.
- both end portions of the weight portion 17 are connected to the first anchor 30 via the detection beam 20, and movable electrodes 21 to 23 are formed on the side surfaces of the weight portion 17.
- each of the first damping electrodes 23 and 26 is a rectangle.
- the planar shapes of the first damping electrodes 23 and 26 may be similar to each other as long as the facing distance between them is constant.
- the planar shape of each of the first damping electrodes 23 and 26 may be a zigzag shape, a crank shape, or a wave shape.
- the opposing area of each of the first damping electrodes 23 and 26 is increased as compared with the configuration in which the planar shape of each of the first damping electrodes 23 and 26 is rectangular.
- the configuration example of the acceleration sensor 100 that detects the acceleration in the y direction is shown.
- an acceleration sensor 200 that detects acceleration in the z direction may be employed.
- the acceleration sensor 200 will be described with reference to FIGS. 9 to 28.
- the components are indicated by being surrounded by a broken line or a dot-dash line as necessary.
- the semiconductor substrate 110 constituting the acceleration sensor 200 has five semiconductor layers 111 to 115 and insulating layers 116 to 119 provided between these semiconductor layers 111 to 115.
- the semiconductor layers 111 and 115 correspond to the first semiconductor layer 11 shown in this embodiment, and the semiconductor layers 112 to 114 and the insulating layers 117 and 118 correspond to the second semiconductor layer 12 shown in this embodiment.
- the insulating layers 116 and 119 correspond to the insulating layer 13 shown in this embodiment.
- the first insulating layer 116 is provided between the first semiconductor layer 111 and the second semiconductor layer 112, and the second insulating layer 117 is provided between the second semiconductor layer 112 and the third semiconductor layer 113. Is provided.
- a third insulating layer 118 is provided between the third semiconductor layer 113 and the fourth semiconductor layer 114, and a fourth insulating layer 119 is provided between the fourth semiconductor layer 114 and the fifth semiconductor layer 115.
- the semiconductor layers 111 and 115 have the same thickness, and the semiconductor layers 112 and 114 have the same thickness.
- the insulating layers 116 to 119 are also equal in thickness to each other, and the distance between two of the semiconductor layers 111 to 115 facing each other through one of the insulating layers 116 to 119 is equal.
- the sensor element 120 is formed by etching the semiconductor substrate 110 into a predetermined shape using a known exposure technique.
- the sensor element 120 includes the floating portion 121 in which the semiconductor layers 112 to 114 and the insulating layers 117 and 118 are floated with respect to the semiconductor layers 111 and 115 and the insulating layers 116 and 119 without the insulating layers 116 and 119 interposed therebetween.
- the semiconductor layers 112 to 114 and the insulating layers 117 and 118 are fixed to the semiconductor layers 111 and 115, respectively.
- the floating portion 121 includes a weight portion 123 that forms the center of mass, a movable electrode 124 formed on the weight portion 123, a fixed electrode 125 that faces the movable electrode 124 in the z direction, and a detection beam that is flexible in the z direction. 126.
- the fixing part 122 has a first anchor 127 that supports the weight part 123 via the detection beam 126. Note that a fixed electrode 125 is also formed on a part of each of the semiconductor layers 111 and 115.
- the weight portion 123 is formed by connecting the central portions of the semiconductor layers 112 to 114 with insulating layers 117 and 118. A part of each of the semiconductor layers 112 and 114 constituting the weight portion 123 carries the movable electrode 124.
- the third semiconductor layer 113 constituting the weight portion 123 is connected to the first anchor 127 via the detection beam 126. With this configuration, the weight portion 123 can be displaced in the z direction. When acceleration along the z direction is applied to the acceleration sensor 200, the weight portion 123 is displaced in the z direction in accordance with the magnitude of the applied acceleration, and the amount of displacement corresponds to the capacitance of the detection capacitor described later. Converted. This converted capacitance is output to an external element as an acceleration detection signal.
- the movable electrode 124 includes a first movable detection electrode 128, a second movable detection electrode 129, and a first movable damping electrode 130.
- the first movable detection electrode 128 is formed on the second semiconductor layer 112 constituting the weight portion 123
- the second movable detection electrode 129 is formed on the fourth semiconductor layer 114 constituting the weight portion 123. It is configured.
- the first movable damping electrode 130 is configured at each end of the second semiconductor layer 112 and the fourth semiconductor layer 114 that configure the weight portion 123.
- the plurality of first movable damping electrodes 130 are positioned symmetrically with respect to the center CP of the weight portion 123. In the present embodiment, the plurality of first movable damping electrodes 130 are also positioned symmetrically with respect to the center line CL passing through the center CP in the z direction.
- the fixed electrode 125 includes a first fixed detection electrode 131, a second fixed detection electrode 132, and a first fixed damping electrode 133.
- the first semiconductor layer 111 is formed with a portion insulated and separated by the insulating layer 111a, and this portion faces the first movable detection electrode 128 in the z direction.
- a portion facing the first movable detection electrode 128 in the z direction corresponds to the first fixed detection electrode 131.
- the fifth semiconductor layer 115 is formed with a portion that is insulated and separated by the insulating layer 115a, and this portion faces the second movable detection electrode 129 in the z direction.
- a portion facing the second movable detection electrode 129 in the z direction corresponds to the second fixed detection electrode 132.
- the detection electrodes 128, 129, 131, and 132 constitute a detection capacitor. Further, as shown in FIG. 9, the end portions of the semiconductor layers 111 and 115 to which the first anchor 127 is fixed and the end portions of the third semiconductor layer 113 are part of the first movable damping electrode in the z direction. 130. This facing portion corresponds to the first fixed damping electrode 133. As described above, only the first fixed damping electrode 133 including the end portion of the third semiconductor layer 113 among the fixed electrodes 131 to 133 is included in the floating portion 121.
- the first fixed detection electrode 131 is located away from the corresponding first movable detection electrode 128 in the first z direction that is one direction of the z direction (the direction from the upper side to the lower side of the paper).
- the second fixed detection electrodes 132 are positioned away from the corresponding second movable detection electrodes 129 in the second z direction (the direction from the lower side of the paper to the upper side of the paper), which is opposite to the first z direction.
- a first detection capacitor is configured by the first detection electrodes 128 and 131 facing each other in the first z direction
- a second detection capacitor is configured by the second detection electrodes 129 and 132 facing each other in the second z direction.
- the first movable damping electrode 130 is located at the center between the two first fixed damping electrodes 133, and is opposed to one first fixed damping electrode 133 in the first z direction, and the other first fixed damping electrode. 133 and the second z-direction are opposed to each other. More specifically, the first movable damping electrode 130 made of the second semiconductor layer 112 has a first fixed damping electrode 133 made of the first semiconductor layer 111 and a first fixed damping electrode 133 made of the third semiconductor layer 113 in the z direction. Located between.
- the first movable damping electrode 130 made of the fourth semiconductor layer 114 is located between the first fixed damping electrode 133 made of the third semiconductor layer 113 and the first fixed damping electrode 133 made of the fifth semiconductor layer 115 in the z direction. Is located. Thereby, even if the weight part 123 is displaced in either the first z direction or the second z direction, damping occurs between the damping electrodes 130 and 133.
- the semiconductor layers 111 to 115 are respectively provided with annular insulating layers 111a and 115a for separating potentials.
- the portions of the semiconductor layers 111 and 115 surrounded by the insulating layers 111a and 115a correspond to the fixed detection electrodes 131 and 132 described above.
- each of the semiconductor layers 112 and 114 includes a part constituting the floating part 121 and a part constituting the fixing part 122 in order to mechanically separate the floating part 121 and the fixing part 122.
- An annular etching is performed between the two.
- the third semiconductor layer 113 is etched in a predetermined shape, and a part of each of the weight portion 123, the first anchor 127, the detection beam 126, and the first movable damping electrode 130 is formed.
- the first anchor 127 has an annular shape
- the weight portion 123 has a rectangular shape.
- the first movable damping electrode 130 also has a rectangular shape, and the detection beam 126 has a zigzag shape. More specifically, the detection beam 126 extends in the x direction and connects the two L-shaped portions 126a and 126b having an L-shape in the xy plane and the two L-shaped portions 126a and 126b.
- An installation portion 126c is provided in a predetermined shape, and a part of each of the weight portion 123, the first anchor 127, the detection beam 126, and the first movable damping electrode 130 is formed.
- the first anchor 127 has an annular shape
- the weight portion 123 has a rectangular shape.
- Each of the L-shaped portions 126a and 126b has a portion extending in the x direction and a portion extending in the y direction, and the ends of the two portions are connected to each other, so that the shape in the xy plane is It is L-shaped.
- One end of a portion extending in the x direction of the first L-shaped portion 126a is connected to the first anchor 127, and one end of a portion extending in the x direction of the second L-shaped portion 126b is connected to the weight portion 123.
- each of the L-shaped portions 126a and 126b are arranged side by side in the x direction, and the end of the portion opposite to the connection end with the portion extending in the x direction is the extended portion 126c. It is connected through.
- the detection beam 126 has a zigzag shape.
- each of the semiconductor layers 112 to 114 has a plurality of notches for adjusting the etching rate.
- FIG. 13 a substrate having a first insulating layer 116 formed on a first semiconductor layer 111 is prepared.
- the central portions of the first semiconductor layer 111 and the first insulating layer 116 are etched.
- etching for forming the first fixed detection electrode 131 is performed on the first semiconductor layer 111.
- an insulating layer 111a is also formed, which is omitted.
- the description of the insulating layer 111a is omitted.
- the second semiconductor layer 112 on which the second insulating layer 117 is formed is stacked on the first semiconductor layer 111 with the first insulating layer 116 interposed therebetween. Then, as shown in FIG. 17, etching for mechanically separating the floating portion 121 and the fixing portion 122 is performed on each of the second semiconductor layer 112 and the second insulating layer 117.
- the third semiconductor layer 113 in which the third insulating layer 118 is formed is stacked on the second semiconductor layer 112 with the second insulating layer 117 interposed therebetween. Then, as shown in FIG. 19, the third semiconductor layer 113 and the third insulating layer 118 are etched to form the weight portion 123, the first anchor 127, the detection beam 126, and the damping electrodes 130 and 133, respectively.
- the fourth semiconductor layer 114 is stacked on the third semiconductor layer 113 with the third insulating layer 118 interposed therebetween. Then, as shown in FIG. 21, the fourth semiconductor layer 114 is subjected to etching for mechanically separating the floating portion 121 and the fixing portion 122.
- the first movable damping is arranged so as to be point-symmetrical via the center CP of the weight portion 123 and line-symmetrical via the centerline CL.
- An electrode 130 is formed on the weight portion 123.
- this 1st movable damping electrode 130 is located in the center between the two 1st fixed damping electrodes 133, and is mutually opposed in the 1st z direction with one 1st fixed damping electrode 133, and the other 1st fixed damping electrode 133 and the second z-direction are opposed to each other.
- the weight portion 123 when a speed is applied in the z direction, excessive displacement in the z direction of the weight portion 123 is suppressed by damping that occurs between the first damping electrodes 130 and 133. Therefore, even when a strong impact such as a rear-end collision is applied, the acceleration generated at that time can be detected.
- the plurality of first movable damping electrodes 130 are positioned symmetrically about the center CP of the weight portion 123 and symmetrical about the center line CL. As a result, when the above-described strong impact is applied, the weight portion 123 is suppressed from rotating in the zx plane, and the posture of the weight portion 123 is controlled.
- a plurality of first movable damping electrodes 130 are positioned in line symmetry and point symmetry via a first reference line passing through the center CP of the weight portion 123 in the x direction and a second reference line passing through the y direction. .
- the weight portion 123 is suppressed from rotating in the zx plane, and the posture of the weight portion 123 is controlled. Therefore, the displacement of the weight portion 123 in the x direction is suppressed, and fluctuations in the facing area between the first detection electrodes 128 and 131 and between the second detection electrodes 129 and 132 are suppressed. As a result, a decrease in acceleration detection accuracy is suppressed.
- the third semiconductor layer 113 has the shape shown in FIG.
- the shape of the third semiconductor layer 113 is not limited to the above example.
- the shapes shown in FIGS. 23 and 24 can be employed.
- four first anchors 127 and four detection beams 126 are formed.
- the first movable damping electrode 130 is formed on each of the four sides of the rectangular weight portion 123
- the first movable damping electrode 130 is formed on each of two sides of the four sides of the weight portion 123. Has been.
- FIG. 25 a configuration in which the detection beam 126 is formed in the semiconductor layers 112 and 114 may be employed.
- the detection beam 126 shown in FIG. 25 is connected to an extending portion 126d extending in the y direction and both ends of the extending portion 126d connected to the central portions of the semiconductor layers 112 and 114 (part of the weight portion 123).
- 1 connection part 126e and the 2nd connection part 126f which connects the center part of the extension part 126d to the edge part (a part of 1st anchor 127) of the semiconductor layers 112,114.
- a plurality of rectangular cutouts are formed in each of the semiconductor layers 112 and 114, but these cutouts are for adjusting the etching rate.
- the cross-sectional shape of the acceleration sensor 200 is the shape shown in FIG. In this case, the plurality of first movable damping electrodes 130 are positioned symmetrically with respect to the center line CL.
- the cross-sectional shape of the acceleration sensor 200 is the shape shown in FIG. In this case, the plurality of first movable damping electrodes 130 are positioned symmetrically with respect to the center CP, and are also symmetrical with respect to the center line CL.
- FIG. 27 shows the schematic configuration of the acceleration sensor 200
- the configuration shown in FIG. 28 is adopted as a more specific configuration of the acceleration sensor 200.
- the basic configuration is the same as that of the acceleration sensor 200 shown in FIG.
- an acceleration sensor that detects acceleration as a physical quantity is exemplified as the capacitance type physical quantity sensor.
- the configuration of the capacitance type physical quantity sensor is not limited to the example of the acceleration sensor.
- an angular velocity sensor that detects an angular velocity as a physical quantity may be employed as the capacitance type physical quantity sensor.
- the angular velocity sensor 300 shown in FIG. 29 will be outlined.
- An angular velocity sensor 300 shown in FIG. 29 includes two vibrating portions 210, a coupled beam 220 for coupling the two vibrating portions 210 to couple the two vibrating portions 210, and an antiphase of the vibrating portion 210. And a detecting unit 240 for detecting displacement (vibration) of the vibrating unit 210 due to the Coriolis force generated by application of the angular velocity, and a damping unit 250 for maintaining the vibration posture of the vibrating unit 210.
- the vibration part 210 has a first frame part 211 and a second frame part 212, and the second frame part 212 is provided in a space surrounded by the inner surface of the first frame part 211.
- a fixed beam 213 for fixing to the anchor 214 is connected to the outer surface of the first frame portion 211, and the first frame portion 211 and the second frame portion 212 are connected via a detection beam 241 to be described later.
- the fixed beam 213 has flexibility in the x direction
- the detection beam 241 has flexibility in the y direction.
- the two vibrating parts 210 are arranged side by side in the x direction, and both are mechanically connected via the coupled beam 220.
- the coupled beam 220 has flexibility in the x direction so that the two vibrating sections 210 can couple and vibrate in opposite phases in the x direction.
- the vibration unit 230 includes a first excitation electrode 231 provided on the outer surface of the portion along the x direction in the first frame portion 211 of each of the two vibration units 210, and a second excitation electrode 232 fixed to the anchor 214. Have.
- the two vibrating parts 210 are coupled and vibrated in opposite phases in the x direction by the electrostatic force acting between the excitation electrodes 231 and 232.
- the detection unit 240 is fixed to the detection beam 241 having one end connected to the inner surface of the first frame portion 211 and the other end connected to the outer surface of the second frame portion 212, and the second frame portion 212 of the vibration unit 210.
- the two vibrating portions 210 vibrate in the x direction with opposite phases. Therefore, when an angular velocity is applied in the z direction, opposite Coriolis forces in the y direction are generated in each of the two vibrating portions 210.
- the detection beams 241 corresponding to the two vibrating portions 210 are bent in the opposite directions in the y direction, and the two vibrating portions 210 are displaced in the opposite directions in the y direction.
- the displacement in the reverse direction in the y direction of the two vibrating parts 210 is detected as the capacitance of the detection capacitor formed by the detection electrodes 242 and 243 described above.
- the displacement of the vibrating part 210 in the y direction depends on the angular velocity.
- the angular velocity is detected based on the difference between the capacitances of the detection capacitors corresponding to the two vibration units 210, respectively.
- the vibration unit 210 vibrates in the x direction when the angular velocity is not applied, and is displaced in the y direction when the angular velocity is applied.
- the angular velocity depends on the vibration state in the x direction and the amount of displacement in the y direction. For this reason, when the vibration unit 210 rotates in the xy plane, the angular velocity detection accuracy may be reduced.
- the angular velocity sensor 300 includes the damping unit 250 that maintains the vibration posture of the vibration unit 210.
- the damping unit 250 includes a first movable damping electrode 251 fixed to the outer surface of the first frame portion 211 of the vibration unit 210 and the first movable damping unit in order to suppress the rotational movement of the vibration unit 210 in the xy plane.
- Each of the damping electrodes 251 and 252 is arranged point-symmetrically via the center CP of the two vibrating parts 210 forming the center of mass, and is also line-symmetrical via a center line CL that penetrates the center CP in the y direction. ing.
- each of the damping electrodes 251 and 252 corresponding to one vibration part 210 is arranged point-symmetrically even through the center of the vibration part 210, and is line-symmetrical via a center line passing through the center in the y direction. It is also.
- Each of the plurality of first movable damping electrodes 251 is positioned at the center between the corresponding two first fixed damping electrodes 252 and faces one of the first fixed damping electrodes 252 in the first y direction, The first fixed damping electrode 252 faces each other in the second y direction.
- a capacitance-type physical quantity sensor is fixed to one surface of a substrate along one surface of an xy plane defined by an x direction and a y direction that are orthogonal to each other.
- An anchor a detection beam connected to the substrate via the anchor, a weight portion connected to the detection beam, a movable electrode formed on the weight portion, and the movable electrode and the xy plane
- An electrostatic capacitance type physical quantity sensor having an opposing fixed electrode, wherein the detection beam has flexibility in the y direction
- the movable electrode includes a first movable detection electrode, a second movable detection electrode, A fixed movable electrode having a first fixed detection electrode, a second fixed detection electrode, and a first fixed damping electrode, wherein the first fixed detection electrode is a first movable detection electrode.
- the first movable detector is located away from the detection electrode in the first y direction, which is one direction of the y direction.
- the second fixed detection electrode is positioned away from the second movable detection electrode in the second y direction opposite to the first y direction, and the second movable detection electrode and the second y detection electrode Facing each other in the direction, each of the plurality of first movable damping electrodes is located at the center between the corresponding two first fixed damping electrodes, facing each other in the first y direction with one of the first fixed damping electrodes,
- the other first fixed damping electrode is opposed to each other in the second y direction, and the plurality of first movable damping electrodes are point-symmetric via the center of the weight part, or a center passing through the center of the weight part along the y direction. It is located symmetrically with respect to the line.
- the damping when a speed is applied in the y direction, the damping is generated between the first movable damping electrode and the first fixed damping electrode in the y direction of the weight portion. Excessive displacement is suppressed. Therefore, even when a strong impact such as a rear-end collision is applied, a physical quantity such as acceleration generated at that time can be detected.
- the plurality of first movable damping electrodes are point-symmetrical via the center of the weight part or line-symmetrical via a center line passing through the center of the weight part along the y direction. positioned.
- the weight portion has a frame shape by connecting two first rod portions along the y direction and two second rod portions along the x direction.
- a first movable damping electrode is formed on the first rod portion, the movable electrode has a second movable damping electrode, the fixed electrode has a second fixed damping electrode, and the second rod portion has A second movable damping electrode is formed, and the second movable damping electrode is located at the center between the two second fixed damping electrodes, and is in the first x direction, which is one direction of the x direction with one second fixed damping electrode.
- each other and facing each other in the second x direction opposite to the first x direction with the other first fixed damping electrode, and the plurality of second movable damping electrodes are symmetric with respect to the center of the weight part, or
- the configuration is located symmetrically with respect to the center line. It may be. According to such a configuration, the damping generated between the second movable damping electrode and the second fixed damping electrode further effectively suppresses the weight part from rotating in the xy plane, The attitude is controlled more effectively. As a result, a decrease in physical quantity detection accuracy is further effectively suppressed.
- the first movable damping electrode and the first fixed damping electrode may have a similar relationship, and the opposed distance between the first movable damping electrode and the first fixed damping electrode may be constant.
- the first movable damping electrode and the first fixed damping electrode are not similar, and the opposed distance between the first movable damping electrode and the first fixed damping electrode is indefinite, It is difficult for bias to occur in the damping that occurs between the first movable damping electrode and the first fixed damping electrode. Therefore, as compared with the comparative configuration described above, the weight portion is suppressed from rotating and the posture of the weight portion is controlled. As a result, a decrease in physical quantity detection accuracy is suppressed.
- the capacitance type physical quantity sensor may be configured as follows.
- a first fixed detection pad for taking out the capacitance of the first detection capacitor formed by the first movable detection electrode and the first fixed detection electrode is formed on the first fixed detection electrode.
- a second fixed detection pad for taking out the capacitance of the second detection capacitor constituted by the second movable detection electrode and the second fixed detection electrode is formed on the second fixed detection electrode.
- a movable detection pad for applying a constant voltage is formed on the weight portion.
- a damping pad for applying a diagnostic voltage having a polarity different from the voltage applied to the movable detection pad is formed on the first fixed damping electrode.
- voltages having different polarities are applied to the first fixed detection pad and the second fixed detection pad for a predetermined time.
- a diagnostic voltage is applied to the damping pad.
- the capacitance of the detection capacitor is taken out from the first fixed detection pad, and the capacitance of the second detection capacitor is taken out from the second fixed detection pad.
- a diagnosis voltage is applied to the damping pad to determine whether or not there is a failure in the capacitance type physical quantity sensor.
- a capacitance type physical quantity sensor includes a substrate having one surface along an xy plane defined by an x direction and a y direction that are orthogonal to each other, and is fixed to the one surface of the substrate.
- Anchors detection beams connected to the substrate via the anchors, weights connected to the detection beams, movable electrodes formed on the weights, and the movable electrodes on the xy plane
- a capacitance type physical quantity sensor having fixed electrodes facing each other in the orthogonal z direction, and is configured as follows.
- the detection beam has flexibility in the z direction.
- the movable electrode includes a first movable detection electrode, a second movable detection electrode, and a first movable damping electrode.
- the fixed electrode includes a first fixed detection electrode, a second fixed detection electrode, and a first fixed damping electrode.
- the first fixed detection electrode is located away from the first movable detection electrode in the first z direction, which is one direction in the z direction, and faces the first movable detection electrode in the first z direction.
- the second fixed detection electrode is located away from the second movable detection electrode in the second z direction, which is opposite to the first z direction, and faces the second movable detection electrode in the second z direction.
- Each of the plurality of first movable damping electrodes is located in the center between the corresponding two first fixed damping electrodes, and one of the corresponding two first fixed damping electrodes and the first z direction Of the corresponding two first fixed damping electrodes and the other first fixed damping electrode in the second z direction.
- the plurality of first movable damping electrodes are positioned point-symmetrically through the center of the weight portion or line-symmetrically through a center line passing through the center of the weight portion along the z direction.
Abstract
Description
(第1実施形態)
図1及び図2に基づいて、本実施形態に係る加速度センサを説明する。図1及び図2では、構成を明りょうとするために、必要に応じてハッチングを施している。以下においては、互いに直交の関係にある2方向をx方向、y方向と示し、これら2つの方向によって規定される平面をx-y平面と示す。また、図1に破線で示すように、y方向に沿い、加速度センサ100の中心(錘部17の中心CP)を通る線を中心線CLと示す。
例えば、本開示の一例に係る静電容量式物理量センサは、互いに直交の関係にあるx方向とy方向とによって規定されるx-y平面に一面が沿う基板と、該基板の一面に固定されたアンカーと、該アンカーを介して基板に連結された検出梁と、該検出梁に連結された錘部と、該錘部に形成された可動電極と、該可動電極とx-y平面にて対向する固定電極と、を有する静電容量式物理量センサであって、検出梁は、y方向に可撓性を有し、可動電極は、第1可動検出電極と、第2可動検出電極と、第1可動ダンピング電極と、を有し、固定電極は、第1固定検出電極と、第2固定検出電極と、第1固定ダンピング電極と、を有し、第1固定検出電極は、第1可動検出電極から、y方向の一方向である第1y方向に離れて位置して、第1可動検出電極と第1y方向にて互いに対向し、第2固定検出電極は、第2可動検出電極から、第1y方向の反対である第2y方向に離れて位置して、第2可動検出電極と第2y方向にて互いに対向し、複数の第1可動ダンピング電極それぞれは、対応する2つの第1固定ダンピング電極の間の中心に位置し、一方の第1固定ダンピング電極と第1y方向で互いに対向し、他方の第1固定ダンピング電極と第2y方向で互いに対向しており、複数の第1可動ダンピング電極は、錘部の中心を介して点対称、若しくは、y方向に沿い錘部の中心を通る中心線を介して線対称に位置している。
Claims (6)
- 互いに直交の関係にあるx方向とy方向とによって規定されるx-y平面に一面が沿う基板(11)と、該基板(11)の一面に固定されたアンカー(30)と、該アンカー(30)を介して前記基板(11)に連結された検出梁(20)と、該検出梁(20)に連結された錘部(17)と、該錘部(17)に形成された可動電極(18)と、該可動電極(18)と前記x-y平面にて対向する固定電極(19)と、を有する静電容量式物理量センサであって、
前記検出梁(20)は、前記y方向に可撓性を有し、
前記可動電極(18)は、第1可動検出電極(21)と、第2可動検出電極(22)と、第1可動ダンピング電極(23)と、を有し、
前記固定電極(19)は、第1固定検出電極(24)と、第2固定検出電極(25)と、第1固定ダンピング電極(26)と、を有し、
前記第1固定検出電極(24)は、前記第1可動検出電極(21)から、前記y方向の一方向である第1y方向に離れて位置して、前記第1可動検出電極(21)と前記第1y方向にて互いに対向し、
前記第2固定検出電極(25)は、前記第2可動検出電極(22)から、前記第1y方向の反対である第2y方向に離れて位置して、前記第2可動検出電極(22)と前記第2y方向にて互いに対向し、
複数の前記第1可動ダンピング電極(23)それぞれは、対応する2つの前記第1固定ダンピング電極(26)の間の中心に位置し、該対応する2つの前記第1固定ダンピング電極のうち一方の前記第1固定ダンピング電極(26)と前記第1y方向で互いに対向し、該対応する2つの前記第1固定ダンピング電極のうち他方の前記第1固定ダンピング電極(26)と前記第2y方向で互いに対向しており、
複数の前記第1可動ダンピング電極(23)は、前記錘部(17)の中心(CP)を介して点対称、若しくは、前記y方向に沿い前記錘部(17)の中心を通る中心線(CL)を介して線対称に位置している静電容量式物理量センサ。 - 前記錘部(17)は、前記y方向に沿う2つの第1棒部(17a)、及び、前記x方向に沿う2つの第2棒部(17b)それぞれの端部が連結されて枠形状を成し、
前記第1棒部(17a)に前記第1可動ダンピング電極(23)が形成されている請求項1に記載の静電容量式物理量センサ。 - 前記可動電極(18)は、第2可動ダンピング電極(27)を有し、
前記固定電極(19)は、第2固定ダンピング電極(28)を有し、
前記第2棒部(17b)に、前記第2可動ダンピング電極(27)が形成され、
前記第2可動ダンピング電極(27)は、2つの前記第2固定ダンピング電極(28)の間の中心に位置し、該2つの前記第2固定ダンピング電極(28)のうち一方の前記第2固定ダンピング電極(28)と前記x方向の一方向である第1x方向で互いに対向し、該2つの前記第2固定ダンピング電極(28)のうち他方の前記第2固定ダンピング電極(28)と前記第1x方向の反対である第2x方向で互いに対向しており、
複数の前記第2可動ダンピング電極(27)は、前記錘部(17)の中心を介して点対称、若しくは、前記y方向に沿い前記錘部(17)の中心を通る中心線を介して線対称に位置している請求項2に記載の静電容量式物理量センサ。 - 前記第1可動ダンピング電極(23)と前記第1固定ダンピング電極(26)とは、相似の関係にあり、
前記第1可動ダンピング電極(23)と前記第1固定ダンピング電極(26)との対向間隔は、一定である請求項1~3いずれか1項に記載の静電容量式物理量センサ。 - 前記第1固定検出電極(24)に、前記第1可動検出電極(21)と前記第1固定検出電極(24)とによって構成される第1検出コンデンサの静電容量を取り出すための第1固定検出パッド(32a)が形成され、
前記第2固定検出電極(25)に、前記第2可動検出電極(22)と前記第2固定検出電極(25)とによって構成される第2検出コンデンサの静電容量を取り出すための第2固定検出パッド(33a)が形成され、
前記錘部(17)に、一定の電圧を印加するための可動検出パッド(30a)が形成され、
前記第1固定ダンピング電極(26)に、前記可動検出パッド(30a)に印加されている電圧とは極性の異なる診断電圧を印加するためのダンピングパッド(34a)が形成されており、
故障診断時において、前記第1固定検出パッド(32a)と前記第2固定検出パッド(33a)それぞれに、極性の異なる電圧が所定時間印加され、該電圧印加直後、前記ダンピングパッド(34a)に前記診断電圧が印加され、該電圧印加時における前記第1検出コンデンサの静電容量が第1固定検出パッド(32a)から取り出され、前記第2検出コンデンサの静電容量が第2固定検出パッド(33a)から取り出される請求項1~4いずれか1項に記載の静電容量式物理量センサ。 - 互いに直交の関係にあるx方向とy方向とによって規定されるx-y平面に一面が沿う基板(11)と、該基板(11)の一面に固定されたアンカー(30)と、該アンカー(30)を介して前記基板(11)に連結された検出梁(20)と、該検出梁(20)に連結された錘部(17)と、該錘部(17)に形成された可動電極(18)と、該可動電極(18)と前記x-y平面に直交するz方向にて対向する固定電極(19)と、を有する静電容量式物理量センサであって、
前記検出梁(20)は、前記z方向に可撓性を有し、
前記可動電極(18)は、第1可動検出電極(21)と、第2可動検出電極(22)と、第1可動ダンピング電極(23)と、を有し、
前記固定電極(19)は、第1固定検出電極(24)と、第2固定検出電極(25)と、第1固定ダンピング電極(26)と、を有し、
前記第1固定検出電極(24)は、前記第1可動検出電極(21)から、前記z方向の一方向である第1z方向に離れて位置して、前記第1可動検出電極(21)と前記第1z方向にて互いに対向し、
前記第2固定検出電極(25)は、前記第2可動検出電極(22)から、前記第1z方向の反対である第2z方向に離れて位置して、前記第2可動検出電極(22)と前記第2z方向にて互いに対向し、
複数の前記第1可動ダンピング電極(23)それぞれは、対応する2つの前記第1固定ダンピング電極(26)の間の中心に位置し、該対応する2つの前記第1固定ダンピング電極(26)のうち一方の前記第1固定ダンピング電極(26)と前記第1z方向で互いに対向し、該対応する2つの前記第1固定ダンピング電極(26)のうち他方の前記第1固定ダンピング電極(26)と前記第2z方向で互いに対向しており、
複数の前記第1可動ダンピング電極(23)は、前記錘部(17)の中心を介して点対称、若しくは、前記z方向に沿い前記錘部(17)の中心を通る中心線を介して線対称に位置している静電容量式物理量センサ。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106082105A (zh) * | 2015-04-27 | 2016-11-09 | 罗伯特·博世有限公司 | 用于加速度传感器的微机械结构 |
CN114814293A (zh) * | 2022-06-29 | 2022-07-29 | 成都华托微纳智能传感科技有限公司 | 一种锯齿形梳齿结构的mems加速度计 |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI126599B (en) | 2014-02-26 | 2017-03-15 | Murata Manufacturing Co | Microelectromechanical frame structure |
JP6575187B2 (ja) * | 2015-07-10 | 2019-09-18 | セイコーエプソン株式会社 | 物理量センサー、物理量センサー装置、電子機器および移動体 |
GB201514319D0 (en) | 2015-08-12 | 2015-09-23 | Atlantic Inertial Systems Ltd | Accelerometers |
FI127042B (en) * | 2015-09-09 | 2017-10-13 | Murata Manufacturing Co | Electrode of a microelectromechanical device |
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JP6939475B2 (ja) * | 2017-11-28 | 2021-09-22 | セイコーエプソン株式会社 | 物理量センサー、物理量センサーデバイス、複合センサーデバイス、慣性計測装置、移動体測位装置、携帯型電子機器、電子機器および移動体 |
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JP7134931B2 (ja) * | 2019-08-28 | 2022-09-12 | 株式会社東芝 | センサ |
DE102020211928A1 (de) | 2020-09-23 | 2022-05-19 | Robert Bosch Gesellschaft mit beschränkter Haftung | Dämpfungsvorrichtung für mikromechanisches Bauelement |
JP7238954B2 (ja) * | 2021-01-13 | 2023-03-14 | 株式会社村田製作所 | 蛇行電極を有するmemsデバイス |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06160419A (ja) * | 1992-11-19 | 1994-06-07 | Omron Corp | 半導体加速度センサならびにその検出装置 |
JPH1151967A (ja) * | 1997-08-08 | 1999-02-26 | Mitsubishi Electric Corp | 多軸加速度センサ及びその製造方法 |
JP2009047649A (ja) * | 2007-08-22 | 2009-03-05 | Toyota Motor Corp | 音叉振動型センサ、力学量検出装置、及び力学量検出方法 |
JP2009168777A (ja) * | 2008-01-21 | 2009-07-30 | Hitachi Ltd | 慣性センサ |
JP2010203990A (ja) * | 2009-03-05 | 2010-09-16 | Seiko Epson Corp | 複合センサー |
JP2011058819A (ja) * | 2009-09-07 | 2011-03-24 | Seiko Epson Corp | Memsセンサーおよびその製造方法 |
US20110083506A1 (en) * | 2009-10-06 | 2011-04-14 | Johannes Classen | Micromechanical structure and method for manufacturing a micromechanical structure |
JP2011163967A (ja) * | 2010-02-10 | 2011-08-25 | Mitsubishi Electric Corp | 加速度センサ |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH075192A (ja) | 1993-06-16 | 1995-01-10 | Nissan Motor Co Ltd | 半導体加速度センサ及びその製造方法 |
JPH0989927A (ja) | 1995-09-28 | 1997-04-04 | Zexel Corp | 多軸加速度センサ |
US6257059B1 (en) * | 1999-09-24 | 2001-07-10 | The Charles Stark Draper Laboratory, Inc. | Microfabricated tuning fork gyroscope and associated three-axis inertial measurement system to sense out-of-plane rotation |
JP3435665B2 (ja) | 2000-06-23 | 2003-08-11 | 株式会社村田製作所 | 複合センサ素子およびその製造方法 |
JP2002040044A (ja) * | 2000-07-21 | 2002-02-06 | Denso Corp | 力学量センサ |
US6504385B2 (en) * | 2001-05-31 | 2003-01-07 | Hewlett-Pakcard Company | Three-axis motion sensor |
JP2003344445A (ja) | 2002-05-24 | 2003-12-03 | Mitsubishi Electric Corp | 慣性力センサ |
US7243545B2 (en) | 2003-03-20 | 2007-07-17 | Denso Corporation | Physical quantity sensor having spring |
JP4569322B2 (ja) | 2005-03-02 | 2010-10-27 | 株式会社デンソー | 可動センサ素子 |
CN100425993C (zh) * | 2006-01-25 | 2008-10-15 | 哈尔滨工业大学 | 框架结构差分电容式加速度传感器 |
JP4310325B2 (ja) * | 2006-05-24 | 2009-08-05 | 日立金属株式会社 | 角速度センサ |
JP2010230441A (ja) | 2009-03-26 | 2010-10-14 | Seiko Epson Corp | Memsセンサー及びその製造方法 |
JP5115618B2 (ja) | 2009-12-17 | 2013-01-09 | 株式会社デンソー | 半導体装置 |
CN201852851U (zh) * | 2010-05-28 | 2011-06-01 | 南京理工大学 | 框架式电容硅微机械加速度计 |
CN101865933A (zh) * | 2010-06-07 | 2010-10-20 | 瑞声声学科技(深圳)有限公司 | 差分电容式加速度传感器 |
JP5874609B2 (ja) * | 2012-03-27 | 2016-03-02 | 株式会社デンソー | 半導体装置およびその製造方法 |
-
2013
- 2013-05-15 JP JP2013103188A patent/JP5772873B2/ja not_active Expired - Fee Related
- 2013-06-06 KR KR20147034481A patent/KR20150007347A/ko not_active Application Discontinuation
- 2013-06-06 DE DE201311002941 patent/DE112013002941T5/de not_active Withdrawn
- 2013-06-06 US US14/405,177 patent/US9964562B2/en not_active Expired - Fee Related
- 2013-06-06 WO PCT/JP2013/003546 patent/WO2013187018A1/ja active Application Filing
- 2013-06-06 CN CN201380031033.6A patent/CN104380120B/zh not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06160419A (ja) * | 1992-11-19 | 1994-06-07 | Omron Corp | 半導体加速度センサならびにその検出装置 |
JPH1151967A (ja) * | 1997-08-08 | 1999-02-26 | Mitsubishi Electric Corp | 多軸加速度センサ及びその製造方法 |
JP2009047649A (ja) * | 2007-08-22 | 2009-03-05 | Toyota Motor Corp | 音叉振動型センサ、力学量検出装置、及び力学量検出方法 |
JP2009168777A (ja) * | 2008-01-21 | 2009-07-30 | Hitachi Ltd | 慣性センサ |
JP2010203990A (ja) * | 2009-03-05 | 2010-09-16 | Seiko Epson Corp | 複合センサー |
JP2011058819A (ja) * | 2009-09-07 | 2011-03-24 | Seiko Epson Corp | Memsセンサーおよびその製造方法 |
US20110083506A1 (en) * | 2009-10-06 | 2011-04-14 | Johannes Classen | Micromechanical structure and method for manufacturing a micromechanical structure |
JP2011163967A (ja) * | 2010-02-10 | 2011-08-25 | Mitsubishi Electric Corp | 加速度センサ |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106082105A (zh) * | 2015-04-27 | 2016-11-09 | 罗伯特·博世有限公司 | 用于加速度传感器的微机械结构 |
CN114814293A (zh) * | 2022-06-29 | 2022-07-29 | 成都华托微纳智能传感科技有限公司 | 一种锯齿形梳齿结构的mems加速度计 |
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DE112013002941T5 (de) | 2015-03-19 |
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US20150143906A1 (en) | 2015-05-28 |
US9964562B2 (en) | 2018-05-08 |
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