Patent Publication Number: US-2023138452-A1

Title: Physical Quantity Sensor and Inertial Measurement Unit

Description:
The present application is based on, and claims priority from JP Application Serial Number 2021-177282, filed Oct. 29, 2021, the disclosure of which is hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a physical quantity sensor, an inertial measurement unit, and the like. 
     2. Related Art 
     In the related art, a physical quantity sensor that detects a physical quantity such as acceleration is known. As such a physical quantity sensor, for example, a sensor disclosed in JP-A-2021-032820 is known. JP-A-2021-032820 discloses a physical quantity sensor including two inertial sensors each including a fixed electrode and a movable electrode. 
     The physical quantity sensor disclosed in JP-A-2021-032820 includes a plurality of inertial sensors in order to detect a physical quantity with high sensitivity. However, when the plurality of inertial sensors are juxtaposed in a Y direction in the physical quantity sensor, a dead space is likely to be formed, and it is difficult to miniaturize the physical quantity sensor. 
     SUMMARY 
     An aspect of the present disclosure relates to a physical quantity sensor including: a first fixed electrode portion provided at a substrate; a first movable electrode portion provided such that a movable electrode faces a fixed electrode of the first fixed electrode portion; at least one first fixed portion fixed to the substrate; a first support beam having one end coupled to the first fixed portion; a second support beam having one end coupled to the first fixed portion; and a first coupling portion coupling the other end of the first support beam and the other end of the second support beam to the first movable electrode portion, in which when three directions orthogonal to one another are defined as a first direction, a second direction, and a third direction, in a plan view in the third direction orthogonal to the substrate, the first movable electrode portion and the first fixed portion are disposed along the first direction, the first support beam and the second support beam are disposed along the second direction, and the first coupling portion includes a first portion disposed along the second direction side by side with the first support beam and the second support beam, and a second portion coupled to the first portion and the first movable electrode portion and disposed along the first direction. 
     Another aspect of the present disclosure relates to an inertial measurement unit including the physical quantity sensor described above and a control unit that performs control based on a detection signal output from the physical quantity sensor. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a configuration example of a physical quantity sensor according to the present embodiment. 
         FIG.  2    is a diagram illustrating an arrangement of the physical quantity sensor. 
         FIG.  3    is a view illustrating an operation of a detection portion. 
         FIG.  4    is a diagram illustrating the operation of the detection portion. 
         FIG.  5    is a view illustrating rotational motion. 
         FIG.  6    is a view illustrating a comparative example of the physical quantity sensor according to the present embodiment. 
         FIG.  7    is a plan view showing another configuration example of the physical quantity sensor. 
         FIG.  8    is a plan view showing another configuration example of the physical quantity sensor. 
         FIG.  9    is a plan view showing another configuration example of the physical quantity sensor. 
         FIG.  10    is a plan view showing another configuration example of the physical quantity sensor. 
         FIG.  11    is a plan view showing a first detailed example of the physical quantity sensor. 
         FIG.  12    is a plan view showing another configuration example of the first detailed example of the physical quantity sensor. 
         FIG.  13    is a plan view showing a second detailed example of the physical quantity sensor. 
         FIG.  14    is a diagram illustrating an arrangement of the second detailed example of the physical quantity sensor. 
         FIG.  15    is a diagram illustrating an arrangement of a comparative example of the second detailed example of the physical quantity sensor. 
         FIG.  16    is a plan view showing a third detailed example of the physical quantity sensor. 
         FIG.  17    is a plan view showing a modification of the third detailed example of the physical quantity sensor. 
         FIG.  18    is a plan view showing a modification of the third detailed example of the physical quantity sensor. 
         FIG.  19    is a plan view showing a modification of the third detailed example of the physical quantity sensor. 
         FIG.  20    is an exploded perspective view showing a schematic configuration of an inertial measurement unit including the physical quantity sensor. 
         FIG.  21    is a perspective view of a circuit board of the physical quantity sensor. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, the present embodiment will be described. The present embodiment to be described below does not unduly limit contents described in the claims. Not all configurations described in the present embodiment are necessarily essential constituent elements. 
     1. Physical Quantity Sensor 
     A configuration example of a physical quantity sensor  1  according to the present embodiment will be described with reference to  FIG.  1    by taking an acceleration sensor that detects acceleration in a vertical direction as an example.  FIG.  1    is a plan view of the physical quantity sensor  1  when viewed in a direction orthogonal to a substrate  2 . The physical quantity sensor  1  is a micro electro mechanical systems (MEMS) device, and is, for example, an inertial sensor. 
     In  FIG.  1   , and  FIGS.  2  to  4  and  6  to  19    to be described later, for convenience of description, dimensions of members, an interval between the members, and the like are schematically illustrated, and not all constituent elements are illustrated. For example, electrode wiring and an electrode terminal are not illustrated. In the following description, a case where a physical quantity detected by the physical quantity sensor  1  is acceleration will be mainly described as an example, and the physical quantity is not limited to the acceleration, and may be another physical quantity such as a velocity, pressure, displacement, an angular velocity, or gravity. The physical quantity sensor  1  may be used as a pressure sensor, an MEMS switch, or the like. In  FIG.  1   , directions orthogonal to one another are defined as a first direction DR 1 , a second direction DR 2 , and a third direction DR 3 . The first direction DR 1 , the second direction DR 2 , and the third direction DR 3  are, for example, an X-axis direction, a Y-axis direction, and a Z-axis direction, respectively, and are not limited thereto. For example, the third direction DR 3  corresponding to the Z-axis direction is, for example, a direction orthogonal to the substrate  2  of the physical quantity sensor  1 , and is, for example, a vertical direction. The first direction DR 1  corresponding to the X-axis direction and the second direction DR 2  corresponding to the Y-axis direction are directions orthogonal to the third direction DR 3 , and an XY plane which is a plane along the first direction DR 1  and the second direction DR 2  is, for example, along a horizontal plane. The term “orthogonal” includes not only a case of crossing at 90° but also a case of crossing at an angle slightly inclined from 90°. 
     The substrate  2  is, for example, a silicon substrate made of semiconductor silicon or a glass substrate made of a glass material such as borosilicate glass. However, a constituent material for the substrate  2  is not particularly limited, and a quartz substrate, a silicon on insulator (SOI) substrate, or the like may be used. 
     Further, as shown in  FIG.  1   , the physical quantity sensor  1  according to the present embodiment includes first fixed electrode portions  10 , a first movable electrode portion  20 , a first coupling portion  30 , a first fixed portion  40 , a first support beam  42 , and a second support beam  43 . 
     These first fixed electrode portions  10 , the first movable electrode portion  20 , the first coupling portion  30 , the first fixed portion  40 , the first support beam  42 , and the second support beam  43  constitute a first detection element  100  of the physical quantity sensor  1 . The first detection element  100  detects, for example, acceleration in the third direction DR 3  which is the Z-axis direction, in a detection portion Z 1  and a detection portion Z 2 . 
     The first fixed electrode portions  10  are provided at the substrate  2 . Specifically, the first fixed electrode portions  10  are fixed to the substrate  2  by fixed portions  3  and  4 , respectively. The first fixed electrode portions  10  include a plurality of fixed electrodes. The plurality of fixed electrodes extend, for example, along the first direction DR 1  which is the X-axis direction. For example, the first fixed electrode portions  10  are first fixed electrode groups. 
     The first movable electrode portion  20  is provided such that a movable electrode faces the fixed electrode of the first fixed electrode portions  10 . The first movable electrode portion  20  includes the plurality of movable electrodes. The plurality of movable electrodes extend, for example, along the first direction DR 1  which is the X-axis direction. For example, the first movable electrode portion  20  is a first movable electrode group. Specifically, a first movable electrode  21  and a second movable electrode  22  of the first movable electrode portion  20  respectively face a first fixed electrode  11  and a second fixed electrode  12  of the first fixed electrode portions  10  in the second direction DR 2  which is the Y-axis direction. 
     For example, in  FIG.  1   , the first movable electrode portion  20  is a comb teeth-shaped movable electrode group in which the plurality of movable electrodes are arranged in a comb teeth shape in a plan view in the third direction DR 3 , and the first fixed electrode portions  10  are the comb teeth-shaped fixed electrode groups in which the plurality of fixed electrodes are arranged in a comb teeth shape in the plan view in the third direction DR 3 . 
     In the detection portions Z 1  and Z 2  of the first detection element  100 , the movable electrodes of the comb teeth-shaped movable electrode group of the first movable electrode portion  20  and the fixed electrodes of the comb teeth-shaped fixed electrode groups of the first fixed electrode portions  10  are arranged in a manner of alternately facing one another. 
     The first fixed portion  40  is fixed to the substrate  2 . Further, one end of the first support beam  42  is coupled to the first fixed portion  40 , and one end of the second support beam  43  is also coupled to the first fixed portion  40 . For example, the first support beam  42  and the second support beam  43  are torsion springs. In  FIG.  1   , two support beams along the second direction DR 2 , that is, the first support beam  42  extending from the first fixed portion  40  in a direction opposite the second direction DR 2  and the second support beam  43  extending from the first fixed portion  40  in the second direction DR 2 , are provided. 
     The first fixed portion  40  is used as an anchor of a first movable body including the first movable electrode portion  20  and the first coupling portion  30 . Further, the first movable body including the first movable electrode portion  20  swings about a rotation shaft along the second direction DR 2  with the first fixed portion  40  as a fulcrum. For example, the first movable body swings around the rotation shaft while twisting and deforming the first support beam  42  and the second support beam  43  with the first support beam  42  and the second support beam  43  along the second direction DR 2  as the rotation shaft. Accordingly, the first detection element  100  having a one-sided seesaw structure is achieved. 
     The first coupling portion  30  includes a first portion  31  disposed along the second direction DR 2  side by side with the first support beam  42  and the second support beam  43 , and a second portion  32  coupled to the first portion  31  and the first movable electrode portion  20  and disposed along the first direction DR 1 . As described above, the one end of the first support beam  42  is coupled to the first fixed portion  40 , and the one end of the second support beam  43  is also coupled to the first fixed portion  40 . Further, the first portion  31  is coupled to the other end of the first support beam  42  which is not coupled to the first fixed portion  40  and the other end of the second support beam  43  which is not coupled to the first fixed portion  40 . One end of the second portion  32  is coupled to the first portion  31 , and the other end of the second portion  32  is coupled to the first movable electrode portion  20 . The first portion  31  and the second portion  32  of the first coupling portion  30  contribute to an inertia moment I to be described later with reference to  FIG.  5   . 
     As described above, the physical quantity sensor  1  according to the present embodiment includes the first fixed electrode portions  10  provided at the substrate  2 , the first movable electrode portion  20  provided such that the movable electrode faces the fixed electrode of the first fixed electrode portions  10 , at least one first fixed portion  40  fixed to the substrate  2 , the first support beam  42  having the one end coupled to the first fixed portion  40 , the second support beam  43  having the one end coupled to the first fixed portion  40 , and the first coupling portion  30  coupling the other end of the first support beam  42  and the other end of the second support beam  43  to the first movable electrode portion  20 . Further, when the three directions orthogonal to one another are defined as the first direction DR 1 , the second direction DR 2 , and the third direction DR 3  in the plan view in the third direction DR 3  orthogonal to the substrate  2 , the first movable electrode portion  20  and the first fixed portion  40  are disposed along the first direction DR 1 , and the first support beam  42  and the second support beam  43  are disposed along the second direction DR 2 . Further, the first coupling portion  30  includes the first portion  31  disposed along the second direction DR 2  side by side with the first support beam  42  and the second support beam  43 , and the second portion  32  coupled to the first portion  31  and the first movable electrode portion  20  and disposed along the first direction DR 1 . 
       FIG.  2    shows a state of the first detection element  100  of the physical quantity sensor  1  in which the first movable electrode portion  20 , the first coupling portion  30 , and the first fixed portion  40  are disposed in the first direction DR 1  in an order of the first movable electrode portion  20 , the first coupling portion  30 , the first fixed portion  40 , and the like in the plan view in the third direction DR 3  orthogonal to the substrate  2 .  FIG.  3    is a view illustrating structures of the electrodes of the detection portions Z 1  and Z 2  of the first detection element  100 . As shown in  FIG.  3   , the movable electrodes and the fixed electrodes of the detection portions Z 1  and Z 2  have different thicknesses in the third direction DR 3 . Specifically, as shown in  FIG.  3   , in the detection portion Z 1 , a thickness of a movable electrode  24  of the first movable electrode portion  20  in the third direction DR 3  is larger than a thickness of a fixed electrode  14  of the first fixed electrode portion  10  in the third direction DR 3 . On the other hand, in the detection portion Z 2 , a thickness of the movable electrode  24  of the first movable electrode portion  20  in the third direction DR 3  is smaller than a thickness of a fixed electrode  14  of the first fixed electrode portion  10  in the third direction DR 3 . Here, the movable electrodes  24  in  FIG.  3    respectively correspond to the first movable electrode  21  and the second movable electrode  22  in  FIG.  1   , and the fixed electrodes  14  respectively correspond to the first fixed electrode  11  and the second fixed electrode  12 . 
       FIG.  4    is a diagram illustrating operation of the detection portions Z 1  and Z 2  in the first detection element  100 . In  FIG.  4   , in an initial state, the fixed electrodes  14  and the movable electrodes  24  are flush since positions of end portions of the movable electrodes  24  and the fixed electrodes  14  on a fourth direction DR 4  side coincide in a side view of the detection portions Z 1  and Z 2  in the second direction DR 2 . Here, the initial state is a stationary state. A fourth direction DR 4  is a direction opposite the third direction DR 3 , and is, for example, a direction on a negative side in the Z-axis direction. 
     When the acceleration in the third direction DR 3  is generated from this initial state, the movable electrodes  24  in the detection portions Z 1  and Z 2  are displaced to the fourth direction DR 4  side, which is the direction opposite the third direction DR 3 , as shown in  FIG.  4   . Accordingly, a facing area between the movable electrode  24  and the fixed electrode  14  is maintained in the detection portion Z 1 , and a facing area between the movable electrode  24  and the fixed electrode  14  decreases in the detection portion Z 2 . Therefore, the acceleration in the third direction DR 3  can be detected by detecting a change in a capacitance due to the decrease in the facing area in the detection portion Z 2 . 
     On the other hand, when acceleration in the fourth direction DR 4  is generated from the initial state, the movable electrodes  24  are displaced to the third direction DR 3  in the detection portions Z 1  and Z 2 , as shown in  FIG.  4   . Accordingly, the facing area between the movable electrode  24  and the fixed electrode  14  decreases in the detection portion Z 1 , and the facing area between the movable electrode  24  and the fixed electrode  14  is maintained in the detection portion Z 2 . Therefore, the acceleration in the fourth direction DR 4  can be detected by detecting a change in a capacitance due to the decrease in the facing area in the detection portion Z 1 . Therefore, the acceleration in the third direction DR 3  and the acceleration in the fourth direction DR 4  can be detected by the detection portions Z 1  and Z 2 . The detection of the change in the capacitance can be achieved by, for example, coupling the first fixed electrode portion  10  of the detection portion Z 1  to a differential amplifier circuit QV via first fixed electrode wiring LF 1 A and a pad PF 1 A, coupling the first fixed electrode portion  10  of the detection portion Z 2  to the differential amplifier circuit QV via first fixed electrode wiring LF 1 B and a pad PF 1 B, and coupling the first movable electrode portion  20  to the differential amplifier circuit QV via first movable electrode wiring LV and a pad PV. 
     In the above description, in the physical quantity sensor  1 , the case where the detection portion Z 1 , the detection portion Z 2 , and the rotation shaft including the first fixed portion  40  and the like are arranged in an order of the detection portion Z 1 , the detection portion Z 2 , and the rotation shaft including the first fixed portion  40  and the like along the first direction DR 1  has been described as an example. Here, the detection portion Z 1  and the detection portion Z 2  may be arranged side by side along the second direction DR 2 . That is, by changing the thicknesses of the fixed electrodes  14  and the movable electrodes  24  in the second direction DR 2 , the detection portion Z 1  and the detection portion Z 2  can also be arranged side by side along the second direction DR 2 . 
     As an acceleration sensor in the Z direction, for example, as described above, an acceleration sensor using a change in electric charge appearing in facing electrodes is known. For example, in an acceleration sensor in a Z direction disclosed in JP-A-2021-032820, when a force in the Z direction is applied, a movable electrode swings around a rotation shaft provided in a direction along a Y axis, and a facing area between an electrode plate of the movable electrode and an electrode plate of a fixed electrode changes, so that acceleration in the Z direction can be detected by detecting a change in electric charge. 
     As described above, the physical quantity sensor  1  according to the present embodiment detects the acceleration in the Z-axis direction by rotational motion of the first movable electrode portion  20  with the Y axis or the X axis as a rotation axis. Here, the rotational motion with the Y axis as the rotation axis will be considered.  FIG.  5    shows a state in which a rigid body RB having a mass m is coupled to a torsion spring S disposed along the Y-axis direction via a rod having a length r. When the torsion spring S is twisted around the Y axis, the rigid body RB can move on a circular orbit in an XZ plane away from the torsion spring S by the length r. 
     In a rotational motion system shown in  FIG.  5   , an equation of motion in the initial state is represented by Formula (1), in which co (rad/sec) represents an angular velocity of the rotational motion about the Y axis, I (kg·m 2 ) represents the inertia moment of the rigid body RB, T (N·m) represents torque acting on the rigid body RB, and k (N) represents a spring constant of the torsion spring S. The inertia moment I is mr 2 . 
     
       
         
           
             
               
                 
                   
                     I 
                     ⁢ 
                     
                       
                         d 
                         ⁢ 
                         ω 
                       
                       dt 
                     
                   
                   = 
                   
                     
                       
                         mgcos 
                         ⁢ 
                         
                           
                             θ 
                             0 
                           
                           · 
                           r 
                         
                       
                       - 
                       
                         k 
                         ⁢ 
                         
                           
                             θ 
                             0 
                           
                           · 
                           r 
                         
                       
                     
                     = 
                     0 
                   
                 
               
               
                 
                   ( 
                   1 
                   ) 
                 
               
             
           
         
       
     
     That is, in the initial state, in a state where the rigid body RB is inclined by an angle θ 0  from the X axis, torque of a gravity component and torque of a component of the torsion spring S are balanced and stationary. Further, when torque is applied to the rigid body RB in the stationary state, the equation of motion is represented by Formula (2). 
     
       
         
           
             
               
                 
                   
                     I 
                     ⁢ 
                     
                       
                         d 
                         ⁢ 
                         ω 
                       
                       dt 
                     
                   
                   = 
                   
                     
                       mgcos 
                       ⁢ 
                       
                         
                           ( 
                           
                             
                               θ 
                               0 
                             
                             + 
                             Δθ 
                           
                           ) 
                         
                         · 
                         r 
                       
                     
                     - 
                     
                       k 
                       ⁢ 
                       
                         
                           ( 
                           
                             
                               θ 
                               0 
                             
                             + 
                             Δθ 
                           
                           ) 
                         
                         · 
                         r 
                       
                     
                   
                 
               
               
                 
                   ( 
                   2 
                   ) 
                 
               
             
           
         
       
     
     That is, when the rigid body RB receives the torque, the rigid body RB is inclined by Δθ from the stationary state and rotates at angular acceleration dω/dt. Here, when the angle Δθ is in a range near zero, cos (θ 0 +Δθ) can be approximated to cos θ 0 −Δθ sin θ 0 , and Formula (2) is approximately expressed as Formula (3). 
     
       
         
           
             
               
                 
                   
                     I 
                     ⁢ 
                     
                       
                         d 
                         ⁢ 
                         ω 
                       
                       dt 
                     
                   
                   
                     
                       = 
                       
                               
                         · 
                       
                     
                     
                       · 
                            
                     
                   
                   
                     
                       ( 
                       
                         
                           mgsin 
                           ⁢ 
                           
                             θ 
                             0 
                           
                         
                         + 
                         k 
                       
                       ) 
                     
                     ⁢ 
                     
                       Δθ 
                       · 
                       r 
                     
                   
                 
               
               
                 
                   ( 
                   3 
                   ) 
                 
               
             
           
         
       
     
     When Δθ/(dω/dt) indicating sensitivity of angular acceleration is solved from Formula (3), the sensitivity of the angular acceleration is represented by Formula (4). 
     
       
         
           
             
               
                 
                   
                     Δθ 
                     
                       
                         d 
                         ⁢ 
                         ω 
                       
                       dt 
                     
                   
                   
                     
                       = 
                       
                               
                         · 
                       
                     
                     
                       · 
                            
                     
                   
                   
                     mr 
                     
                       
                         mgsin 
                         ⁢ 
                         
                           θ 
                           0 
                         
                       
                       + 
                       k 
                     
                   
                 
               
               
                 
                   ( 
                   4 
                   ) 
                 
               
             
           
         
       
     
     From Formula (4), when the angle θ 0  in the stationary state is small, the sensitivity of the angular acceleration is increased as the length r corresponding to a distance between the rotation shaft and the rigid body RB is increased, and the sensitivity of the angular acceleration is increased as the mass m of the rigid body RB is increased. Therefore, regarding sensitivity of the acceleration in the Z direction, the sensitivity of the acceleration in the Z-axis direction is improved as the mass m of an electrode at a tip of a seesaw is increased, and the sensitivity of the acceleration in the Z-axis direction is improved as a distance between the rotation shaft and the electrode or the like is increased. 
     In this regard, the physical quantity sensor in the Z-axis direction disclosed in JP-A-2021-032820 adopts a structure in which a sufficient distance from the rotation shaft of the movable electrode to a position where the fixed electrode and the movable electrode face each other is ensured. Therefore, from Formula (4) indicating the sensitivity of the acceleration in the Z direction described above, by adopting such a structure, the length r in Formula (4) can be increased, and the sensitivity of the acceleration in the Z-axis direction can be improved. By increasing the distance, a mass of a movable body including the movable electrode in the rotational motion system around the rotation shaft is also increased, and the sensitivity of the acceleration in the Z direction is improved. Furthermore, the sensitivity of the acceleration in the Z direction can also be improved by adopting a structure in which two detection portions each including one set of the movable electrode and the fixed electrode are provided in one physical quantity sensor, that is, a structure in which two one-sided seesaws are provided. 
     On the other hand, a dead space is increased by increasing the distance between the movable electrode and the rotation shaft or providing a plurality of detection elements in one physical quantity sensor. That is, by disposing the movable electrode at a distance from the rotation shaft, the detection sensitivity of the acceleration in the Z-axis direction is improved, an area from the rotation shaft to the movable electrode is increased, and a size of the acceleration sensor is increased. Although the sensitivity of the acceleration in the Z direction can be improved by providing two detection elements in one physical quantity sensor as in JP-A-2021-032820, since the detection elements are juxtaposed in an XY plane in JP-A-2021-032820, an arrangement area is increased as the number of the detection elements is increased, and a size of the physical quantity sensor is increased. As described above, both the improvement of the detection sensitivity of the acceleration of the physical quantity sensor and miniaturization cannot be achieved at the same time. 
     In the present embodiment shown in  FIG.  1   , a distance corresponding to the length r in the rotational motion system described with reference to  FIG.  5    is a distance from the rotation shaft including the first fixed portion  40  to the first movable electrode portion  20 . Therefore, as shown in the present embodiment, by providing the first coupling portion  30  with the first portion  31  and the second portion  32  and lengthening the second portion  32  in the first direction DR 1 , the length r in Formula (4) can be increased, and the detection sensitivity of the acceleration of the physical quantity sensor  1  can be improved. 
     Here, when the rotation shaft including the first support beam  42  and the second support beam  43  is coupled to the first movable electrode portion  20  via the second portion  32  of the first coupling portion  30 , the mass m in the second portion  32  in Formula (4) is reduced as a width of the second portion  32  in the second direction DR 2  is narrowed. Therefore, the sensitivity of the acceleration is reduced. However, since the second portion  32  is close to the rotation shaft and has a small length r in Formula (4), an influence on the rotational motion of the movable body including the first movable electrode portion  20  is small. Therefore, it is possible to ensure the effective length r of the movable body and improve the detection sensitivity of the physical quantity sensor  1  while preventing deterioration of the sensitivity of the acceleration due to a decrease of the mass m in the second portion  32 . 
     From the viewpoint of the miniaturization of the physical quantity sensor  1 , for example, the first coupling portion  30  may be configured as in a comparative example shown in  FIG.  6   . Even when the first coupling portion  30  is configured in this manner, by increasing the distance between the rotation shaft including the first fixed portion  40  and the first movable electrode portion  20  to provide an opening portion, formation of a dead space can be prevented, and both the improvement of the detection sensitivity of the acceleration of the physical quantity sensor  1  and the miniaturization can be achieved at the same time. However, in the comparative example, since the one end of the first support beam  42  and the one end of the second support beam  43  are coupled at a position separated from the rotation shaft including the first fixed portion  40 , the rotation shaft is unstable, and detection accuracy of the acceleration in the third direction DR 3  deteriorates. 
     Therefore, according to the present embodiment, since the first portion  31  disposed along the second direction DR 2  side by side with the first support beam  42  and the second support beam  43  is provided in the first coupling portion  30 , the end sides of the first support beam  42  and the second support beam  43  of which the other ends are coupled to the first fixed portion  40  can be coupled and held by the first portion  31  of the first coupling portion  30 . Accordingly, swinging of the rotation shaft by the first support beam  42  and the second support beam  43  can be prevented by using rigidity of the first portion  31 . Since the second portion  32  coupled to the first portion  31  and the first movable electrode portion  20  and disposed along the first direction DR 1  is provided in the first coupling portion  30 , the opening portion is formed in a region surrounded by the first portion  31  and the second portion  32 , and a vacant space can be ensured. Accordingly, the miniaturization and the like of the physical quantity sensor  1  can be achieved by disposing other elements and the like in the vacant space. Even when such an opening portion is formed in the movable body including the first movable electrode portion  20 , since a position of the opening portion is closer to the rotation shaft including the first support beam  42  and the second support beam  43  than the first movable electrode portion  20 , a decrease in the sensitivity of the physical quantity sensor  1  can be prevented. 
     In the present embodiment, the first coupling portion  30  may include a third portion  33  coupled to the second portion  32  and disposed along the second direction DR 2  side by side with the first movable electrode portion  20 . 
     In this way, the third portion  33  of the first coupling portion  30  functioning as a mass portion can be provided at a position distant from the rotation shaft including the first support beam  42  and the second support beam  43 . Therefore, a mass of the entire movable body including the first movable electrode portion  20  and a distance from the rotation shaft can be gained. Therefore, the mass m and the length r in Formula (4) indicating the sensitivity of the acceleration can be gained, and the detection sensitivity of the acceleration in the Z axis can be improved. 
     In the physical quantity sensor  1  according to the present embodiment, the fixed electrode  14  of the first fixed electrode portion  10  and the movable electrode  24  of the first movable electrode portion  20  can be provided in a manner of facing each other in the second direction DR 2 . 
     In this way, a voltage is applied between the fixed electrode  14  of the first fixed electrode portion  10  and the movable electrode  24  of the first movable electrode portion  20 , which are provided in a manner of facing each other, whereby electric charge is accumulated in the facing portions of both of the electrodes. Further, when a force is applied in the direction along the Z direction, the first movable electrode portion  20  moves along the Z-axis direction, so that the facing area between both of the electrodes changes, and accordingly, an amount of the electric charge accumulated in both of the electrodes changes. By providing the fixed electrode  14  and the movable electrode  24  in a manner of facing each other in the second direction DR 2 , when the first movable electrode portion  20  rotates around the rotation shaft including the first support beam  42  and the second support beam  43 , the fixed electrode  14  and the movable electrode  24  can move such that the facing area between both of the electrodes changes while maintaining a state in which the fixed electrode  14  and the movable electrode  24  face each other in parallel. Therefore, the acceleration in the third direction DR 3  can be detected by the rotation of the movable body including the first movable electrode portion  20  and the like. 
     In the physical quantity sensor  1  according to the present embodiment, the first movable electrode portion  20  may include a first base movable electrode  23 , the first movable electrode  21  extending from the first base movable electrode  23  in the first direction DR 1 , and the second movable electrode  22  extending from the first base movable electrode  23  in a direction opposite the first direction DR 1 , and the first fixed electrode portions  10  may include the first fixed electrode  11  facing the first movable electrode  21  and the second fixed electrode  12  facing the second movable electrode  22 . 
     In  FIG.  1   , in the first movable electrode portion  20 , the first movable electrode  21  and the second movable electrode  22  extend from the first base movable electrode  23  extending in a direction along the second direction DR 2  to both sides along the first direction DR 1 . With such a structure, for example, when acceleration occurs in the first direction DR 1  which is another axis direction, the facing area between the first fixed electrode  11  and the first movable electrode  21  decreases, while the facing area between the second fixed electrode  12  and the second movable electrode  22  increases. Therefore, with respect to the acceleration, the facing area between the first fixed electrode  11  and the first movable electrode  21  and the facing area between the second fixed electrode  12  and the second movable electrode  22  change in a manner of cancelling each other out. When the acceleration occurs in the direction opposite the first direction DR 1 , the facing area between the first fixed electrode  11  and the first movable electrode  21  increases, while the facing area between the second fixed electrode  12  and the second movable electrode  22  decreases. Therefore, with respect to the acceleration, the facing area between the first fixed electrode  11  and the first movable electrode  21  and the facing area between the second fixed electrode  12  and the second movable electrode  22  change in a manner of cancelling each other out. In this way, with respect to the acceleration in the direction along the first direction DR 1 , the change in the facing area between the fixed electrode  14  and the movable electrode  24  in the detection portion Z 1  and the change in the facing area between the fixed electrode  14  and the movable electrode  24  in the detection portion Z 2  cancel each other out. Therefore, the total facing area between the fixed electrodes  14  and the movable electrodes  24  does not change in the whole portion including the detection portions Z 1  and Z 2 , and it is possible to prevent a situation where when acceleration in, for example, the first direction DR 1  other than the third direction DR 3  occurs, the acceleration in the first direction DR 1  is erroneously detected as the acceleration in the third direction DR 3 . Therefore, deterioration of sensitivity of the physical quantity sensor  1  in another axis can be prevented. 
       FIG.  7    shows another configuration example of the physical quantity sensor  1  according to the present embodiment. The configuration example shown in  FIG.  7    is different from the configuration example shown in  FIG.  1    in shapes of the first fixed electrode portions  10  and the first movable electrode portion  20  and a positional relationship thereof. In the configuration example shown in  FIG.  1   , the first fixed electrode portions  10  and the first movable electrode portion  20  are provided in the order of the first fixed electrode portion  10 , the first movable electrode portion  20 , and the first fixed electrode portion  10  in the first direction DR 1 . On the other hand, in the configuration example shown in  FIG.  7   , the first fixed electrode portion  10  and the first movable electrode portion  20  are provided in an order of the first movable electrode portion  20 , the first fixed electrode portion  10 , and the first movable electrode portion  20  in the first direction DR 1 . That is, in the configuration example shown in  FIG.  1   , one first movable electrode portion  20  is provided between the two first fixed electrode portions  10 , whereas in the configuration example shown in  FIG.  7   , one first fixed electrode portion  10  is provided between two portions that constitute one first movable electrode portion  20  and that are coupled on the second direction DR 2  side. Therefore, regarding the fixed portions  3  and  4  that fix the first fixed electrode portions  10  to the substrate  2  in  FIG.  1   , the fixed portion  4  is not present in the configuration example shown in  FIG.  7   . In the configuration example shown in  FIG.  7   , the first movable electrode portion  20  is provided in a manner of surrounding the first fixed electrode portion  10 . Further, the first movable electrode portion  20  on the first direction DR 1  side is integrated with the third portion  33  of the first coupling portion  30 . That is, in the physical quantity sensor  1  according to the present embodiment, the first fixed electrode portion  10  may include a first base fixed electrode  13 , the first fixed electrode  11  extending from the first base fixed electrode  13  in the first direction DR 1 , and the second fixed electrode  12  extending from the first base fixed electrode  13  in the direction opposite the first direction DR 1 , and the first movable electrode portion  20  may include the first movable electrode  21  facing the first fixed electrode  11  and the second movable electrode  22  facing the second fixed electrode  12 . 
     In this way, the first detection element  100  can be provided with the detection portion Z 2  that includes the first fixed electrode  11  extending from the first base fixed electrode  13  in the first direction DR 1  and the first movable electrode  21  facing the first fixed electrode  11  and that has a parallel plate capacitance, and the detection portion Z 1  that includes the second fixed electrode  12  extending from the first base fixed electrode  13  in the direction opposite the first direction DR 1  and the second movable electrode  22  facing the second fixed electrode  12  and that has a parallel plate capacitance. That is, the detection portions Z 1  and Z 2  can be configured by one first base fixed electrode  13  provided in the first fixed electrode portion  10 . Therefore, similarly to the above, for example, when acceleration is applied in the first direction DR 1 , a capacitance between the first fixed electrode  11  and the first movable electrode  21  increases, while a capacitance between the second fixed electrode  12  and the second movable electrode  22  decreases. Therefore, since the capacitances of the detection portions Z 1  and Z 2  provided in one one-sided seesaw structure change in a manner of canceling each other out, the deterioration of the sensitivity in another axis can be prevented. 
       FIG.  8    shows another configuration example according to the present embodiment. The configuration example shown in  FIG.  8    is different from the configuration example shown in  FIG.  1    in a configuration of the first fixed portion  40  and a shape of the first portion  31  of the first coupling portion  30 . In the configuration example shown in  FIG.  1   , the first fixed portion  40  is a single fixed portion, whereas in the configuration example shown in  FIG.  8   , the first fixed portion  40  includes first fixed portions  40 A and  40 B. Specifically, one end of the movable body including the first movable electrode portion  20  and the first coupling portion  30  is fixed by the first fixed portions  40 A and  40 B provided in a direction along the second direction DR 2 . Further, one end of the first support beam  42  is coupled to the first fixed portion  40 A, and one end of the second support beam  43  is coupled to the first fixed portion  40 B. As described above, in the configuration example shown in  FIG.  8   , the movable body including the first movable electrode portion  20  and the first coupling portion  30  is fixed by the first fixed portions  40 A and  40 B. Therefore, the first portion  31  of the first coupling portion  30  couples, between the first fixed portion  40 A and the first fixed portion  40 B, the other end of the first support beam  42  which is not coupled to the first fixed portion  40 A and the other end of the second support beam  43  which is not coupled to the first fixed portion  40 B. That is, in the physical quantity sensor  1  according to the present embodiment, at least one first fixed portion  40  may include two fixed portions, the one end of the first support beam  42  may be coupled to one of the two fixed portions, and the one end of the second support beam  43  may be coupled to the other of the two fixed portions. 
     In this way, the movable body including the first movable electrode portion  20  and the first coupling portion  30  is fixed to the substrate  2  by the two fixed portions, that is, the first fixed portions  40 A and  40 B, and the first movable electrode portion  20  can swing around a rotation shaft along the second direction DR 2 . 
     In the configuration examples shown in  FIGS.  1  and  7   , since the first support beam  42  and the second support beam  43  serving as the rotation shaft of the movable body are fixed to the substrate  2  by one first fixed portion  40 , the first support beam  42  and the second support beam  43  are in a state of being easily swung. On the other hand, in the configuration example shown in  FIG.  8   , the rotation shaft including the first support beam  42  and the second support beam  43  is fixed to the substrate  2  by the first fixed portion  40 A and the first fixed portion  40 B. With such a configuration, ease of the swinging around the rotation shaft including the first support beam  42  and the second support beam  43  does not change, but rigidity against wobbling with the second direction DR 2  as a rotation axis is increased even in the same spring dimension. Therefore, when an impact is applied in the second direction DR 2 , the rotation shaft including the first support beam  42  and the second support beam  43  is less likely to be displaced, and thus impact resistance is improved. Therefore, the detection accuracy when the physical quantity sensor  1  detects the acceleration in the third direction DR 3  can be improved. 
       FIGS.  9  and  10    show modifications of the configuration example of the physical quantity sensor  1  shown in  FIG.  1   . A configuration example shown in  FIG.  9    is different from the configuration example in  FIG.  1    in the arrangement of the first portion  31  of the first coupling portion  30 . That is, in the configuration example shown in  FIG.  9   , the first portion  31  of the first coupling portion  30  is provided at the first direction DR 1  side of the first fixed portion  40  in a direction along the second direction DR 2  in a plan view seen from the third direction DR 3 , and couples the one end of the first support beam  42  and the one end of the second support beam  43 . Even in this case, the same effect as that of the physical quantity sensor  1  of the configuration example shown in  FIG.  1    can be obtained. 
     In a configuration example shown in  FIG.  10   , the first portion  31  of the first coupling portion  30  includes first portions  31 A and  31 B. That is, the one end of the first support beam  42  which is not coupled to the first fixed portion  40  and the one end of the second support beam  43  which is not coupled to the first fixed portion  40  are coupled to each other by the first portion  31 B on the first direction DR 1  side of the first fixed portion  40 , and are coupled to each other by the first portion  31 A in a direction opposite the first direction DR 1  of the first fixed portion  40 . Even in this case, the same effect as that of the physical quantity sensor  1  of the configuration example shown in  FIG.  1    can be obtained. 
     In the configuration examples shown in  FIGS.  1  and  7  to  10   , as described with reference to  FIG.  4   , the case where the end portions of the fixed electrode  14  and the movable electrode  24  in the direction opposite the third direction DR 3  in the initial state are flush with each other has been described, but the present embodiment is not limited thereto. For example, when the initial state in  FIG.  4    is described as an example, in the detection portion Z 1 , one end of the movable electrode  24  may be offset with respect to one end of the fixed electrode  14  on the third direction DR 3  side, and the other end of the fixed electrode  14  and the other end of the movable electrode  24  are not offset on the side opposite the third direction DR 3  side, but the other end of the fixed electrode  14  may be offset with respect to the other end of the movable electrode  24  on the side opposite the third direction DR 3 . In the detection portion Z 2 , one end of the fixed electrode  14  is offset with respect to one end of the movable electrode  24  on the third direction DR 3  side, and the other end of the fixed electrode  14  and the other end of the movable electrode  24  are not offset in the direction opposite the third direction DR 3 , but the other end of the movable electrode  24  may be offset with respect to the other end of the fixed electrode  14  on the side opposite the third direction DR 3 . That is, in the initial state, in each of the detection portions Z 1  and Z 2 , the one end of the fixed electrode  14  and the one end of the movable electrode  24  on the third direction DR 3  side may not be flush with each other, and the other end of the fixed electrode  14  and the other end of the movable electrode  24  on the side opposite the third direction DR 3  side may not be flush with each other. In this way, for example, when the acceleration occurs in the third direction DR 3 , the facing area increases and the capacitance increases in the detection portion Z 1 , and the facing area decreases and the capacitance decreases in the detection portion Z 2 . On the other hand, when the acceleration occurs in the direction opposite the third direction DR 3 , the facing area decreases and the capacitance decreases in the detection portion Z 1 , and the facing area increases and the capacitance increases in the detection portion Z 2 . Accordingly, each of the detection portions Z 1  and Z 2  can detect both the acceleration in the third direction DR 3  and the acceleration in the direction opposite the third direction DR 3 , and thus the detection sensitivity of the acceleration can be improved. In this way, for example, the acceleration in both the third direction DR 3  and the direction opposite the third direction DR 3  can be detected by a pair of the first fixed electrode portion  10  and the first movable electrode portion  20  in the detection portion Z 1 , and thus the two detection portions Z 1  and Z 2  are not required to be provided as the detection portions. Therefore, according to the present embodiment, the acceleration can be detected by one detection portion, and the physical quantity sensor  1  can be miniaturized. 
     2. Detailed Configuration Examples 
     Next, detailed configuration examples of the physical quantity sensor  1  according to the present embodiment will be described.  FIG.  11    is a first detailed example of the physical quantity sensor  1  according to the present embodiment. In the first detailed example, as compared with the physical quantity sensor  1  shown in  FIG.  1   , a second detection element  102  is provided in a region surrounded by the first portion  31  and the second portion  32  of the first coupling portion  30 . The second detection element  102  is, for example, an acceleration sensor that detects acceleration in a direction along the first direction DR 1 . That is, the physical quantity sensor  1  detects the acceleration in the third direction DR 3 , which is a direction perpendicular to a plane of the substrate  2 , by the first detection element  100 , and detects, for example, the acceleration in the first direction DR 1  in the plane by the second detection element  102 . The second detection element  102  may be an element that detects acceleration in the second direction DR 2  instead of the acceleration in the first direction DR 1 . 
     That is, the physical quantity sensor  1  according to the present embodiment may include the first detection element  100  including the first fixed electrode portions  10 , the first movable electrode portion  20 , the first fixed portion  40 , the first support beam  42 , the second support beam  43 , and the first coupling portion  30 , and the second detection element  102 , and the second detection element  102  may be disposed in the region surrounded by the first portion  31  and the second portion  32  of the first coupling portion  30 . 
     In this way, the physical quantity sensor  1  shown in  FIG.  1    can detect the physical quantity such as acceleration in the first direction DR 1  or the second direction DR 2  together with the acceleration in the third direction DR 3 . 
     In the first detailed example shown in  FIG.  11   , the third portion  33  may be provided in the first coupling portion  30 . That is, in the physical quantity sensor  1  according to the present embodiment, the first coupling portion  30  may include the third portion  33  coupled to the second portion  32  and disposed along the second direction DR 2  side by side with the first movable electrode portion  20 , and the second detection element  102  may be disposed in the region surrounded by the first portion  31 , the second portion  32 , and the third portion  33  of the first coupling portion  30 . 
     As described with reference to  FIG.  1   , in this way, the third portion  33  provided at a position distant from the rotation shaft including the first support beam  42  and the second support beam  43  functions as a mass in the rotational motion of the first movable electrode portion  20 , and thus the detection sensitivity of the acceleration in the third direction DR 3 , that is, the Z-axis direction can be improved. 
     As shown in  FIG.  12   , in the first detailed example and the like of  FIG.  11   , the first fixed electrode wiring LF 1 A and LF 1 B coupled to the first fixed electrode portion  10 , the first movable electrode wiring LV coupled to the first movable electrode portion  20 , and a first wiring group L 1  coupled to the second detection element  102  can be provided. The first wiring group L 1  includes L 11 , L 12 , and L 13 . The first wiring group L 1  may include either wiring L 12  or L 13 . 
     That is, the present embodiment may include the first fixed electrode wiring LF 1 A and LF 1 B coupled to the first fixed electrode portions  10 , the first movable electrode wiring LV coupled to the first movable electrode portion  20 , and the first wiring group L 1  coupled to the second detection element  102 , and the first fixed electrode wiring LF 1 A and LF 1 B, the first movable electrode wiring LV, and the first wiring group L 1  may be wired along the second direction DR 2 . In this way, the first fixed electrode portion  10  of the detection portion Z 1  is coupled to the differential amplifier circuit QV (not shown) via the first fixed electrode wiring LF 1 A and the pad PF 1 A, the first fixed electrode portion  10  of the detection portion Z 2  is coupled to the differential amplifier circuit QV via the first fixed electrode wiring LF 1 B and the pad PF 1 B, and the first movable electrode portion  20  is coupled to the differential amplifier circuit QV via the first movable electrode wiring LV and the pad PV, whereby the acceleration in the direction along the third direction DR 3  can be detected. The wiring L 11 , L 12 , and L 13  of the first wiring group L 1  are coupled to the differential amplifier circuit QV via pads P 1 , P 2 , and P 3 , whereby the acceleration in the direction along the first direction DR 1  can be detected. Since the plurality of wiring can be wired along the second direction DR 2 , terminals coupled to the wiring can be collected on one side, and the physical quantity sensor  1  can be miniaturized. 
     In the present embodiment, the first coupling portion  30  may not be provided in a space surrounded by the first portion  31 , the second portion  32 , and the third portion  33  of the first coupling portion  30  in the direction opposite the second direction DR 2 . Further, the first fixed electrode wiring LF 1 A and LF 1 B coupled to the first fixed electrode portions  10  and the first wiring group L 1  coupled to the second detection element  102  are wired along the second direction DR 2 . Therefore, the first wiring group L 1  can be wired in a manner of being led out to the direction opposite the second direction DR 2  in which the first coupling portion  30  is not provided. Therefore, according to the present embodiment, the second portion  32  of the first coupling portion  30  is not disposed in a region where the first wiring group L 1  is wired, and the first wiring group L 1  can be wired without straddling the second portion  32 . Therefore, generation of a capacitance between the first wiring group L 1  and the second portion  32  can be prevented, and the second detection element  102  can be provided without deteriorating the accuracy of the acceleration detection in the third direction DR 3 . 
       FIG.  13    is a second detailed example of the physical quantity sensor  1  according to the present embodiment. The second detailed example is different from the configuration example shown in  FIG.  1    in the configuration of the first detection element  100 . That is, the first detection element  100  of the second detailed example includes a first element portion  91  and a second element portion  92 . 
     The first element portion  91  has a configuration similar to that of the first detection element  100  of the physical quantity sensor  1  shown in  FIG.  1   . That is, the first element portion  91  includes the first fixed electrode portions  10 , the first movable electrode portion  20 , the first coupling portion  30 , the first fixed portion  40 , the first support beam  42 , and the second support beam  43 . Here, the first fixed electrode portions  10 , the first movable electrode portion  20 , the first coupling portion  30 , the first fixed portion  40 , the first support beam  42 , and the second support beam  43  are as described with reference to  FIG.  1   . 
     The second element portion  92  includes second fixed electrode portions  50 , a second movable electrode portion  60 , a second coupling portion  70 , a second fixed portion  80 , a third support beam  82 , and a fourth support beam  83 . Here, the second fixed electrode portions  50 , the second movable electrode portion  60 , the second coupling portion  70 , the second fixed portion  80 , the third support beam  82 , and the fourth support beam  83  of the second element portion  92  correspond to the first fixed electrode portions  10 , the first movable electrode portion  20 , the first coupling portion  30 , the first fixed portion  40 , the first support beam  42 , and the second support beam  43  of the first element portion  91 , respectively. A third fixed electrode  51 , a fourth fixed electrode  52 , a second base fixed electrode  53 , and fixed electrodes  54  of the second element portion  92  respectively correspond to the first fixed electrode  11 , the second fixed electrode  12 , the first base fixed electrode  13 , and the fixed electrodes  14  of the first element portion  91 , and the third movable electrode  61 , the fourth movable electrode  62 , the second base movable electrode  63 , and movable electrodes  64  of the second element portion  92  respectively correspond to the first movable electrode  21 , the second movable electrode  22 , the first base movable electrode  23 , and the movable electrodes  24  of the first element portion  91 . Further, a fourth portion  71  and a fifth portion  72  in the second coupling portion  70  of the second element portion  92  correspond to the first portion  31  and the second portion  32  in the first coupling portion  30  of the first element portion  91 , respectively. 
     As shown in  FIG.  14   , in the first element portion  91  of the physical quantity sensor  1 , the first movable electrode portion  20 , the first coupling portion  30 , the first fixed portion  40 , and the like are arranged in the order of the first movable electrode portion  20 , the first coupling portion  30 , the first fixed portion  40 , and the like along the first direction DR 1  in the plan view in the third direction DR 3  orthogonal to the substrate  2 . In the second element portion  92 , the second movable electrode portion  60 , the second coupling portion  70 , the second fixed portion  80 , and the like are arranged in an order of the second fixed portion  80 , the second coupling portion  70 , the second movable electrode portion  60 , and the like along the first direction DR 1  in the plan view in the third direction DR 3 . Further, the first element portion  91  and the second element portion  92  are arranged in the order of the first element portion  91  and the second element portion  92  along the first direction DR 1  in the plan view in the third direction DR 3  orthogonal to the substrate  2 . 
     That is, the physical quantity sensor  1  according to the present embodiment includes the second fixed electrode portions  50  provided at the substrate  2 , the second movable electrode portion  60  provided such that the movable electrode  64  faces the fixed electrode  54  of the second fixed electrode portions  50 , at least one second fixed portion  80  fixed to the substrate  2 , the third support beam  82  having one end coupled to the second fixed portion  80 , the fourth support beam  83  having one end coupled to the second fixed portion  80 , and the second coupling portion  70  coupling the other end of the third support beam  82  and the other end of the fourth support beam  83  to the second movable electrode portion  60 . Further, in the plan view, the second fixed portion  80  and the second movable electrode portion  60  may be disposed along the first direction DR 1 , the third support beam  82  and the fourth support beam  83  may be disposed along the second direction DR 2 , and the second coupling portion  70  may include the fourth portion  71  disposed along the second direction DR 2  side by side with the third support beam  82  and the fourth support beam  83 , and the fifth portion  72  coupled to the fourth portion  71  and the second movable electrode portion  60  and disposed along the first direction DR 1 . 
     In this way, similar to the case of the configuration example in  FIG.  1   , the acceleration in the third direction DR 3  and the fourth direction DR 4  can be detected by the first element portion  91  of the first detection element  100 . Further, in the second element portion  92  of the first detection element  100 , a movable body including the second movable electrode portion  60  swings along the third direction DR 3  using the third support beam  82  and the fourth support beam  83  as torsion springs, whereby the acceleration in the third direction DR 3  or the fourth direction DR 4  can also be detected. That is, the acceleration in the fourth direction DR 4  can be detected by the detection portion Z 1  of the second element portion  92 , and the acceleration in the third direction DR 3  can be detected by the detection portion Z 2 . Therefore, according to the present embodiment, the acceleration in the third direction DR 3  and the fourth direction DR 4  can be detected by elements of both the first element portion  91  and the second element portion  92 , and the acceleration in the third direction DR 3  and the fourth direction DR 4  can be detected with high sensitivity. 
       FIG.  15    is a diagram showing a comparative example of the present embodiment.  FIG.  15    is a plan view of the physical quantity sensor  1  according to the present embodiment in the third direction DR 3  orthogonal to the substrate  2  as in the case of  FIG.  14   . This comparative example shows the physical quantity sensor  1  in which the first fixed portion  40 , the first coupling portion  30 , the first movable electrode portion  20 , the second movable electrode portion  60 , the second coupling portion  70 , the second fixed portion  80 , and the like are arranged in this order along the first direction DR 1  in the plan view in the third direction DR 3 . In this comparative example, the first fixed portion  40  and the second fixed portion  80  are provided at positions separated from each other as compared with the case of the second detailed example shown in  FIGS.  13  and  14   . Therefore, when warpage occurs in the substrate  2  due to stress, influences of the warpage on the first fixed portion  40  and the second fixed portion  80  are different, and thus the accuracy of the detection of the acceleration in the third direction DR 3  deteriorates. Therefore, in the comparative example shown in  FIG.  15   , there is a problem that the detection sensitivity of the acceleration is easily affected by the warpage of the substrate  2  due to thermal stress or external stress. That is, in the acceleration sensor in the Z-axis direction which is the third direction DR 3 , in the case where two detection elements which have a shape of a seesaw structure are provided, when portions which are fixed portions of the seesaws are disposed apart from each other by the detection elements, the portions are easily affected by the warpage of the substrate  2  and the like, and it is difficult to detect the acceleration with high accuracy. 
     In this regard, according to the second detailed example shown in  FIG.  13   , the first fixed portion  40  of the first element portion  91  and the second fixed portion  80  of the second element portion  92  can be disposed close to each other. Therefore, even if the warpage of the substrate  2  and the like of the physical quantity sensor  1  occurs, the deterioration of the accuracy of the acceleration detection due to the influence of the warpage can be prevented. Although the case where the two detection elements each having the seesaw structure are provided has been described above, the same applies to a case where three or more detection elements are provided. 
       FIG.  16    is a third detailed example of the physical quantity sensor  1  according to the present embodiment. The physical quantity sensor  1  of the third detailed example includes the second detection element  102  and a third detection element  104  in addition to the configuration of the second detailed example. The second detection element  102  is, for example, an acceleration sensor in the first direction DR 1  other than the third direction DR 3 . The third detection element  104  is, for example, an acceleration sensor in the second direction DR 2  other than the third direction DR 3 . 
     That is, the physical quantity sensor  1  according to the present embodiment includes the first detection element  100  including the first fixed electrode portions  10 , the first movable electrode portion  20 , the first fixed portion  40 , the first support beam  42 , the second support beam  43 , the first coupling portion  30 , the second fixed electrode portion  50 , the second movable electrode portion  60 , the second fixed portion  80 , the third support beam  82 , the fourth support beam  83 , and the second coupling portion  70 , the second detection element  102 , and the third detection element  104 . Further, the second detection element  102  may be disposed in a region surrounded by the first portion  31  and the second portion  32  of the first coupling portion  30 , and the third detection element  104  may be disposed in a region surrounded by the fourth portion  71  and the fifth portion  72  of the second coupling portion  70 . 
     According to the third detailed example, as shown in  FIG.  16   , the second detection element  102  and the third detection element  104  are provided. Therefore, the acceleration in the first direction DR 1  can be detected by the second detection element  102 , and the acceleration in the second direction DR 2  can be detected by the third detection element  104 . Therefore, the physical quantity sensor  1  can detect the acceleration in the first direction DR 1  and the second direction DR 2  together with the acceleration in the third direction DR 3 . 
     According to the third detailed example, in the plan view in the third direction DR 3  orthogonal to the substrate  2 , the second detection element  102  is disposed in a region surrounded by the first portion  31  and the second portion  32  of the first coupling portion  30  and the first fixed electrode portion  10 , and the third detection element  104  is disposed in a region surrounded by the fourth portion  71  and the fifth portion  72  of the second coupling portion  70  and the second fixed electrode portion  50 . Therefore, in the plan view in the third direction DR 3  orthogonal to the substrate  2 , the first element portion  91 , the second element portion  92 , the second detection element  102 , and the third detection element  104  can be arranged side by side in a rectangular region of the substrate  2 . Therefore, these elements can be provided without generating the dead space, and the physical quantity sensor  1  can be miniaturized. 
     In the third detailed example shown in  FIG.  16   , the first element portion  91  may include the third portion  33  in the first coupling portion  30 , and the second element portion  92  may include a sixth portion  73  in the second coupling portion  70 . Here, the third portion  33  of the first coupling portion  30  is the same as the third portion  33  described with reference to  FIG.  1   . The sixth portion  73  of the second coupling portion  70  in the second element portion  92  is a portion corresponding to the third portion  33  of the first coupling portion  30  in the first element portion  91 . 
     That is, in the physical quantity sensor  1  according to the present embodiment, the first coupling portion  30  includes the third portion  33  coupled to the second portion  32  and disposed along the second direction DR 2  side by side with the first movable electrode portion  20 . The second coupling portion  70  includes the sixth portion  73  coupled to the fifth portion  72  and disposed along the second direction DR 2  side by side with the second movable electrode portion  60 . Further, the second detection element  102  may be disposed in the region surrounded by the first portion  31 , the second portion  32 , and the third portion  33  of the first coupling portion  30 , and the third detection element  104  may be disposed in a region surrounded by the fourth portion  71 , the fifth portion  72 , and the sixth portion  73  of the second coupling portion  70 . 
     As described above, the third portion  33  of the first coupling portion  30  functioning as the mass portion at the position distant from the rotation shaft including the first support beam  42  and the second support beam  43  can be provided, the mass of the entire movable body including the first movable electrode portion  20  and the distance from the rotation shaft can be gained. Therefore, the detection sensitivity of the acceleration in the Z axis can be improved. Similarly, in the sixth portion  73  of the second coupling portion  70 , a mass of the entire movable body including the second movable electrode portion  60  and a distance from a rotation shaft including the third support beam  82  and the fourth support beam  83  can be gained, and the detection sensitivity of the acceleration in the Z axis can be improved. 
     In the third detailed example shown in  FIG.  16   , the first fixed electrode wiring LF 1 A and LF 1 B coupled to the first fixed electrode portions  10 , the first movable electrode wiring LV coupled to the first movable electrode portion  20 , the first wiring group L 1  coupled to the second detection element  102 , second fixed electrode wiring LF 2 A and LF 2 B coupled to the second fixed electrode portions  50 , second movable electrode wiring LV coupled to the second movable electrode portion  60 , and a second wiring group L 2  coupled to the third detection element  104  may be provided. Here, the first fixed electrode wiring LF 1 A and LF 1 B, the first movable electrode wiring LV, and the first wiring group L 1  are as described with reference to  FIG.  12   . The second fixed electrode wiring LF 2 A and LF 2 B, the second movable electrode wiring LV, and the second wiring group L 2  are wiring corresponding to the first fixed electrode wiring LF 1 A and LF 1 B, the first movable electrode wiring LV, and the first wiring group L 1  on the second element portion  92  side, respectively. Further, the first fixed electrode wiring LF 1 A and LF 1 B and the first movable electrode wiring LV are coupled to the differential amplifier circuit QV provided outside the physical quantity sensor  1  via the pads PF 1 A, PF 1 B, and PV, respectively, as described with reference to  FIG.  12   . The second fixed electrode wiring LF 2 A and LF 2 B and the second movable electrode wiring LV are coupled to the differential amplifier circuit QV via pads PF 2 A, PF 2 B, and PV, respectively. 
     That is, the physical quantity sensor  1  according to the present embodiment may include the first fixed electrode wiring LF 1 A and LF 1 B coupled to the first fixed electrode portions  10 , the first movable electrode wiring LV coupled to the first movable electrode portion  20 , the second fixed electrode wiring LF 2 A and LF 2 B coupled to the second fixed electrode portions  50 , the second movable electrode wiring LV coupled to the second movable electrode portion  60 , the first wiring group L 1  coupled to the second detection element  102 , and the second wiring group L 2  coupled to the third detection element  104 . Further, the first fixed electrode wiring LF 1 A and LF 1 B, the first movable electrode wiring LV, the second fixed electrode wiring LF 2 A and LF 2 B, the second movable electrode wiring LV, the first wiring group L 1 , and the second wiring group L 2  may be wired along the second direction DR 2 . In this way, similarly to the case in  FIG.  12   , the acceleration in the direction along the third direction DR 3  and the acceleration in the direction along the first direction DR 1  can be detected. The second fixed electrode portion  50  of the detection portion Z 1  is coupled to the differential amplifier circuit QV via the second fixed electrode wiring LF 2 A and the pad PF 2 A, the second fixed electrode portion  50  of the detection portion Z 2  is coupled to the differential amplifier circuit QV via the second fixed electrode wiring LF 2 B and the pad PF 2 B, and the second movable electrode portion  60  is coupled to the differential amplifier circuit QV via the second movable electrode wiring LV and the pad PV, whereby the acceleration in the direction along the third direction DR 3  can be detected. Further, the second wiring group L 2  is coupled to the differential amplifier circuit QV via pads P 4 , P 5 , and P 6 , whereby the acceleration in the direction along the second direction DR 2  can be detected. According to the present embodiment, since the plurality of wiring can be wired along the second direction DR 2 , the pads coupled to the wiring can be collected on one side, and the physical quantity sensor  1  can be miniaturized. 
     As described with reference to  FIG.  12   , according to the present embodiment, the second portion  32  of the first coupling portion  30  is not disposed in the region where the first wiring group L 1  is wired, and the first wiring group L 1  can be wired in a manner of not straddling the second portion  32 , and thus the generation of the capacitance between the first wiring group L 1  and the second portion  32  can be prevented. Similarly, in the third detection element  104 , the second wiring group L 2  can be wired in a manner of not straddling the fifth portion  72 , and generation of capacitance between the second wiring group L 2  and the fifth portion  72  can be prevented. Therefore, the second detection element  102  and the third detection element  104  can be provided without deteriorating the accuracy of the acceleration detection in the third direction DR 3 . 
     In the third detailed example shown in  FIG.  16   , the detection portion Z 1  and the detection portion Z 2  of the first element portion  91  may be arranged along the second direction DR 2 , and the detection portion Z 1  and the detection portion Z 2  of the second element portion  92  may also be arranged along the second direction DR 2 . For example, by changing thicknesses of the fixed electrodes  14  and the movable electrodes  24  of the first element portion  91  in the second direction DR 2  and changing thicknesses of the fixed electrodes  54  and the movable electrodes  64  of the second element portion  92  in the second direction DR 2 , the detection portion Z 1  and the detection portion Z 2  can be arranged along the second direction DR 2  in each of the first element portion  91  and the second element portion  92 . 
       FIGS.  17  and  18    are modifications of the third detailed example shown in  FIG.  16   . The modification shown in  FIG.  17    is different from the third detailed example in the arrangement of the first element portion  91  and the second element portion  92 . Specifically, in the modification shown in  FIG.  17   , the first element portion  91  and the second element portion  92  are arranged in an order of the second element portion  92  and the first element portion  91  in the second direction DR 2 . In  FIG.  18   , as in  FIG.  17   , the first element portion  91  and the second element portion  92  are arranged along the second direction DR 2 . Differences from  FIG.  17    are that the fixed portions  3  and  4  of the first element portion  91  are provided at the second direction DR 2  side, and the fixed portions  5  and  6  of the second element portion  92  are also provided at the second direction DR 2  side. Further, the first coupling portion  30  and the first movable electrode portion  20  are arranged in a manner of being coupled in an S-shape via the third portion  33  of the first coupling portion  30 . Similarly, in the second element portion  92 , the second coupling portion  70  and the second movable electrode portion  60  are arranged in a manner of being coupled in an S-shape via the sixth portion  73  of the second coupling portion  70 . The modifications shown in  FIGS.  17  and  18    can also obtain the same effect as that of the third detailed example. 
       FIG.  19    is another modification of the third detailed example shown in  FIG.  16   . The modification shown in  FIG.  19    is different from the third detailed example in arrangement methods of the detection portions Z 1  and Z 2 . In the modification shown in  FIG.  19   , the first element portion  91  includes the detection portion Z 1 , and the second element portion  92  includes the detection portion Z 2 . That is, in the modification shown in  FIG.  19   , the first element portion  91  may not include one of the detection portions Z 1  and Z 2 , and the second element portion  92  may not include the other one thereof. In this case, as described with reference to  FIG.  4   , the first element portion  91  can detect the acceleration in the fourth direction DR 4  by the detection portion Z 1 , and the second element portion  92  can detect the acceleration in the third direction DR 3  by the detection portion Z 2 . Therefore, the acceleration in the third direction DR 3  and the fourth direction DR 4  can be detected by the first detection element  100  including the first element portion  91  and the second element portion  92 . Even when the detection portions Z 1  and Z 2  are provided in this manner, the same effect as that of the third detailed example can be obtained. 
     3. Inertial Measurement Unit 
     Next, an example of an inertial measurement unit  2000  according to the present embodiment will be described with reference to  FIGS.  20  and  21   . The inertial measurement unit (IMU)  2000  shown in  FIG.  20    is a device that detects inertial momentum such as a posture or a behavior of a moving body such as an automobile or a robot. The inertial measurement unit  2000  is a six-axis motion sensor including an acceleration sensor that detects acceleration ax, ay, and az in directions along three axes and an angular velocity sensor that detects angular velocities cox, coy, and coz around the three axes. 
     The inertial measurement unit  2000  has a rectangular parallelepiped shape and has a substantially square planar shape. Screw holes  2110  as mount portions are formed in the vicinity of two vertexes located in a diagonal direction of the square. Two screws can be inserted into the two screw holes  2110  to fix the inertial measurement unit  2000  to a mounted surface of a mounted body such as an automobile. It is also possible to reduce a size of the inertial measurement unit  2000  to a size that can be mounted on a smartphone or a digital camera, for example, by selecting a component or changing a design. 
     The inertial measurement unit  2000  includes an outer case  2100 , a bonding member  2200 , and a sensor module  2300 , and has a configuration in which the sensor module  2300  is inserted inside the outer case  2100  with the bonding member  2200  interposed therebetween. The sensor module  2300  includes an inner case  2310  and a circuit board  2320 . The inner case  2310  is formed with a recess  2311  for preventing contact with the circuit board  2320  and an opening  2312  for exposing a connector  2330  to be described later. Further, the circuit board  2320  is bonded to a lower surface of the inner case  2310  via an adhesive. 
     As shown in  FIG.  21   , the connector  2330 , an angular velocity sensor  2340   z  that detects an angular velocity around the Z axis, an acceleration sensor unit  2350  that detects acceleration in the x-axis, y-axis, and z-axis directions, and the like are mounted on an upper surface of the circuit board  2320 . An angular velocity sensor  2340   x  that detects an angular velocity around the X axis and an angular velocity sensor  2340   y  that detects an angular velocity around the Y axis are mounted on a side surface of the circuit board  2320 . 
     The acceleration sensor unit  2350  includes at least the physical quantity sensor  1  that measures the acceleration in the Z-axis direction described above, and can detect the acceleration in one axial direction or the acceleration in two axial directions or three axial directions as necessary. The angular velocity sensors  2340   x ,  2340   y , and  2340   z  are not particularly limited, and for example, a vibration gyro sensor using a Coriolis force can be used. 
     A control IC  2360  is mounted on a lower surface of the circuit board  2320 . The control IC  2360  as a control unit that performs control based on a detection signal output from the physical quantity sensor  1  is, for example, a micro controller unit (MCU), includes a storage unit including a nonvolatile memory, an A/D converter, and the like, and controls units of the inertial measurement unit  2000 . Besides, a plurality of electronic components are mounted on the circuit board  2320 . 
     As described above, the inertial measurement unit  2000  according to the present embodiment includes the physical quantity sensor  1  and the control IC  2360  as the control unit that performs the control based on the detection signal output from the physical quantity sensor  1 . According to the inertial measurement unit  2000 , since the acceleration sensor unit  2350  including the physical quantity sensor  1  is used, the inertial measurement unit  2000  capable of obtaining the effect of the physical quantity sensor  1  and achieving the high accuracy and the like can be provided. 
     The inertial measurement unit  2000  is not limited to the configurations in  FIGS.  20  and  21   . For example, the inertial measurement unit  2000  may have a configuration in which only the physical quantity sensor  1  is provided as the inertial sensor without providing the angular velocity sensors  2340   x ,  2340   y , and  2340   z . In this case, for example, the inertial measurement unit  2000  may be implemented by accommodating the physical quantity sensor  1  and the control IC  2360  that implements the control unit in a package that is an accommodating container. 
     As described above, the physical quantity sensor according to the present embodiment relates to a physical quantity sensor including: a first fixed electrode portion provided at a substrate; a first movable electrode portion provided such that a movable electrode faces a fixed electrode of the first fixed electrode portion; at least one first fixed portion fixed to the substrate; a first support beam having one end coupled to the first fixed portion; a second support beam having one end coupled to the first fixed portion; and a first coupling portion coupling the other end of the first support beam and the other end of the second support beam to the first movable electrode portion. Further, when three directions orthogonal to one another are defined as a first direction, a second direction, and a third direction, in a plan view in the third direction orthogonal to the substrate, the first movable electrode portion and the first fixed portion are disposed along the first direction, the first support beam and the second support beam are disposed along the second direction, and the first coupling portion includes a first portion disposed along the second direction side by side with the first support beam and the second support beam, and a second portion coupled to the first portion and the first movable electrode portion and disposed along the first direction. 
     According to the present embodiment, by forming an opening portion in a movable body including the first movable electrode portion, the first movable electrode portion serving as a mass portion can be separated by a width of the opening portion, and the sensitivity of the physical quantity sensor can be improved. 
     In the present embodiment, the first coupling portion may include a third portion coupled to the second portion and disposed along the second direction side by side with the first movable electrode portion. 
     In this way, the third portion of the first coupling portion functioning as the mass portion can be provided at a position distant from a rotation shaft including the first support beam and the second support beam, and the detection sensitivity of the physical quantity sensor can be improved. 
     In the present embodiment, the fixed electrode of the first fixed electrode portion and the movable electrode of the first movable electrode portion may be provided in a manner of facing each other in the second direction. 
     In this way, when a force is applied in the third direction, the first movable electrode portion can rotate about the second direction as a rotation axis while maintaining a state in which the fixed electrode and the movable electrode face each other in parallel. Therefore, a facing area between the fixed electrode and the movable electrode changes, and a physical quantity in the third direction can be detected. 
     In the present embodiment, the first movable electrode portion may include a first base movable electrode, a first movable electrode extending from the first base movable electrode in the first direction, and a second movable electrode extending from the first base movable electrode in a direction opposite the first direction, and the first fixed electrode portion may include a first fixed electrode facing the first movable electrode and a second fixed electrode facing the second movable electrode. 
     In this way, when a physical quantity in another axis direction changes, for example, one of a facing area between the first movable electrode and the first fixed electrode and a facing area between the second movable electrode and the second fixed electrode decreases, the other facing area increases, and deterioration of sensitivity in another axis can be prevented. 
     In the present embodiment, the first fixed electrode portion may include a first base fixed electrode, a first fixed electrode extending from the first base fixed electrode in the first direction, and a second fixed electrode extending from the first base fixed electrode in a direction opposite the first direction, and the first movable electrode portion may include a first movable electrode facing the first fixed electrode and a second movable electrode facing the second fixed electrode. 
     In this way, when a physical quantity in another axis direction changes, for example, one of a facing area between the first movable electrode and the first fixed electrode and a facing area between the second movable electrode and the second fixed electrode decreases, the other facing area increases, and the deterioration of the sensitivity in another axis can be prevented. 
     In the present embodiment, the at least one first fixed portion may include two fixed portions, the one end of the first support beam may be coupled to one of the two fixed portions, and the one end of the second support beam may be coupled to the other one of the two fixed portions. 
     In this way, a movable body including the first movable electrode portion and the first coupling portion is fixed to the substrate by the two fixed portions. Therefore, a position of a rotation shaft including the first support beam and the second support beam on the substrate can be stabilized. 
     The present embodiment may include: a first detection element including the first fixed electrode portion, the first movable electrode portion, the first fixed portion, the first support beam, the second support beam, and the first coupling portion; and a second detection element, and the second detection element may be disposed in a region surrounded by the first portion and the second portion of the first coupling portion. 
     In this way, the second detection element can be disposed using the region surrounded by the first portion and the second portion of the first coupling portion, and the physical quantity sensor can be miniaturized. 
     In the present embodiment, the first coupling portion may include a third portion coupled to the second portion and disposed along the second direction side by side with the first movable electrode portion, and the second detection element may be disposed in a region surrounded by the first portion, the second portion, and the third portion of the first coupling portion. 
     In this way, the third portion provided at a position distant from a rotation shaft including the first support beam and the second support beam functions as a mass in a rotational motion of the first movable electrode portion, and thus the detection sensitivity of the physical quantity sensor can be improved. 
     The present embodiment may include: a first fixed electrode wiring coupled to the first fixed electrode portion; a first movable electrode wiring coupled to the first movable electrode portion; and a first wiring group coupled to the second detection element, and the first fixed electrode wiring, the first movable electrode wiring, and the first wiring group may be wired along the second direction. 
     In this way, since a plurality of wiring can be wired along the second direction, pads coupled to the wiring can be collected on one side, and the physical quantity sensor can be miniaturized. 
     The present embodiment includes: a second fixed electrode portion provided at the substrate; a second movable electrode portion provided such that a movable electrode faces a fixed electrode of the second fixed electrode portion; at least one second fixed portion fixed to the substrate; a third support beam having one end coupled to the second fixed portion; a fourth support beam having one end coupled to the second fixed portion; and a second coupling portion coupling the other end of the third support beam and the other end of the fourth support beam to the second movable electrode portion, and in the plan view, the second fixed portion and the second movable electrode portion are disposed along the first direction, and the third support beam and the fourth support beam are disposed along the second direction. The second coupling portion includes a fourth portion disposed along the second direction side by side with the third support beam and the fourth support beam, and a fifth portion coupled to the fourth portion and the second movable electrode portion and disposed along the first direction. 
     In this way, by arranging the first fixed portion of a first detection element and the second fixed portion of a second detection element close to each other, even if warpage and the like of the substrate of the physical quantity sensor occurs, deterioration of accuracy of acceleration detection due to an influence of the warpage and the like can be prevented. 
     The present embodiment may include: a first detection element including the first fixed electrode portion, the first movable electrode portion, the first fixed portion, the first support beam, the second support beam, the first coupling portion, the second fixed electrode portion, the second movable electrode portion, the second fixed portion, the third support beam, the fourth support beam, and the second coupling portion; a second detection element; a third detection element. Further, the second detection element may be disposed in a region surrounded by the first portion and the second portion of the first coupling portion, and the third detection element may be disposed in a region surrounded by the fourth portion and the fifth portion of the second coupling portion. 
     In this way, the second detection element and the third detection element can be effectively provided in a dead space generated along with increase in the sensitivity of the physical quantity sensor, and a physical quantity in the first direction or the second direction can be detected together with a physical quantity in the third direction. 
     In the present embodiment, the first coupling portion may include a third portion coupled to the second portion and disposed along the second direction side by side with the first movable electrode portion, and the second coupling portion may include a sixth portion coupled to the fifth portion and disposed along the second direction side by side with the second movable electrode portion. Further, the second detection element may be disposed in a region surrounded by the first portion, the second portion, and the third portion of the first coupling portion  30 , and the third detection element may be disposed in a region surrounded by the fourth portion, the fifth portion, and the sixth portion of the second coupling portion. 
     In this way, the third portion of the first coupling portion functioning as a mass portion can be provided at a position distant from a rotation shaft including the first support beam and the second support beam, and a mass of an entire movable body including the first movable electrode portion and a distance from the rotation shaft can be gained, and the detection sensitivity of the physical quantity sensor can be improved. Similarly, in the sixth portion of the second coupling portion, a mass of an entire movable body including the second movable electrode portion and a distance from the rotation shaft can be gained, and detection sensitivity of acceleration in the third direction can be improved. 
     The present embodiment may include: a first fixed electrode wiring coupled to the first fixed electrode portion; a first movable electrode wiring coupled to the first movable electrode portion; a second fixed electrode wiring coupled to the second fixed electrode portion; a second movable electrode wiring coupled to the second movable electrode portion; a first wiring group coupled to the second detection element; and a second wiring group coupled to the third detection element. Further, the first fixed electrode wiring, the first movable electrode wiring, the second fixed electrode wiring, the second movable electrode wiring, the first wiring group, and the second wiring group may be wired along the second direction. 
     In this way, since a plurality of wiring can be wired along the second direction, pads coupled to the wiring can be collected on one side, and the physical quantity sensor can be miniaturized. 
     The present embodiment relates to an inertial measurement unit including a control unit configured to perform control based on a detection signal output from the physical quantity sensor. 
     Although the present embodiment has been described in detail above, it will be easily understood by those skilled in the art that many modifications can be made without substantially departing from the novel matters and effects of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure. For example, a term cited with a different term having a broader meaning or the same meaning at least once in the specification or in the drawings can be replaced with the different term in any place in the specification or in the drawings. All combinations of the present embodiment and the modifications are also included within the scope of the present disclosure. The configurations, operations, and the like of the physical quantity sensor and the inertial measurement unit are not limited to those described in the present embodiment, and various modifications can be made.