Patent Publication Number: US-2023165154-A1

Title: Mounting Structure, Ultrasonic Device, Ultrasonic Probe, Ultrasonic Apparatus, And Electronic Apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 16/097,011 filed on Oct. 26, 2018, which is a National Stage Application of International Application No. PCT/JP2017/015920, filed on Apr. 20, 2017, and published in Japanese as WO 2017/188125 A1 on Nov. 2, 2017, which claims priority to Japanese Patent Application Nos. 2016-184369, filed on Sep. 21, 2016 and 2016-089569, filed on Apr. 27, 2016. The entire disclosures of the above applications are incorporated herein by reference. 
    
    
     BACKGROUND 
     Technical Field 
     The present invention relates to amounting structure, an ultrasonic device, an ultrasonic probe, an ultrasonic apparatus, and an electronic apparatus. 
     Related Art 
     In a case where an electric component is mounted on a circuit substrate, there is a mounting method in which a wiring on the circuit substrate side is electrically connected to a wiring on the electric component side via a bump electrode (for example, refer to JP-2007-180166). 
     JP-2007-180166 discloses the electric component in which an electronic element such as an IC chip and a conductive film as a metal wiring connected to the electronic element are formed on a substrate. A part of the conductive film is provided on a surface of a resin protrusion formed at a peripheral edge portion of the substrate, and the bump electrode is configured to have the part of the conductive film and the resin protrusion. The circuit substrate is a substrate on which a liquid crystal panel is formed, and an electrode terminal is formed outside a region in which liquid crystal is disposed. The electric component is bonded to the circuit substrate in a state in which the bump electrodes on the electric component side are brought into direct contact with the electrode terminals on the circuit substrate side. 
     However, in the configuration disclosed in JP-2007-180166, the electrode terminal of the circuit substrate is formed outside the region in which a functional element such as liquid crystal is formed, and the bump electrode of the electronic component is formed at the peripheral edge portion of the substrate. The electrode terminal is brought into contact with the bump electrode, and thus wiring connection between the circuit substrate and the electronic component is performed at a position separated from the functional element. 
     However, in the above-described wiring method, in a case where wiring connection is performed in the region in which the functional element is formed, alignment between the circuit substrate and the electronic component is required to be performed with high accuracy. In other words, in a case where the alignment accuracy is not sufficient, there is concern that the bump electrode may interfere with the functional element. As mentioned above, in the configuration of the related art, it is not easy to perform electrical connection between substrates in the region in which the functional element is formed. 
     An object of the present invention is to provide a mounting structure, an ultrasonic device, an ultrasonic probe, an ultrasonic apparatus, and an electronic apparatus as application examples and embodiments, capable of easily performing electrical connection between substrates. 
     SUMMARY 
     A mounting structure according to an application example includes: a first substrate that has a first surface on which a functional element is provided; a wiring portion that is provided at a position, which is different from a position of the functional element on the first surface, and is conductively connected to the functional element; a second substrate that has a second surface that is opposite to the first surface; and a conduction portion that is provided on the second surface, is connected to the wiring portion, and is conductively connected the functional element. The shortest distance between the functional element and the second substrate is longer than the longest distance between the second substrate and a position where the wiring portion is connected to the conduction portion. 
     In the application example, the functional element and the wiring portion conductively connected to the functional element are provided on the first surface of the first substrate. The conduction portion connected to the wiring portion is provided on the second surface of the second substrate. The shortest distance between the functional element and the second substrate is longer than the longest distance between the second substrate and the position where the wiring portion is connected to the conduction portion. In this configuration, for example, even if a position difference occurs in the conduction portion when wiring connection is performed around the functional element, it is possible to suppress interference between the conduction portion and the functional element. Therefore, it is possible to easily perform wiring connection between the first substrate and the second substrate. 
     In the mounting structure according to the application example, it is preferable that an area of a region in which the conduction portion is bonded to the second substrate is larger than an area of a region in which the wiring portion is connected to the conduction portion. 
     In the application example, the area of the region in which the conduction portion is bonded to the second substrate is larger than the area of the region in which the wiring portion is connected to the conduction portion. In other words, a sectional area of the conduction portion in a plane intersecting the first direction is reduced from the second substrate toward the first substrate. In this configuration, a distance between the conduction portion and the functional element in the plane intersecting the first direction can be increased from the first substrate toward the second substrate on which the functional element is provided. Therefore, it is possible to further suppress interference between the conduction portion and the functional element. The conduction portion and the functional element can be disposed to be closer to each other in plan view viewed from the first direction. 
     In the mounting structure according to the application example, it is preferable that at least one of the wiring portion and the conduction portion includes a resin part and a conductive part covering the resin part. 
     In the application example, at least one of the wiring portion and the conduction portion includes the resin part and the conductive part covering the resin part. In this configuration, when the conduction portion is brought into contact with the wiring portion, the resin part can be elastically deformed, and one of the wiring portion and the conduction portion can be deformed along the other thereof. Therefore, it is possible to improve close contact between the conduction portion and the wiring portion, and thus it is possible to improve connection reliability. 
     In the mounting structure according to the application example, it is preferable that in a first direction directed from the first substrate to the second substrate, a thickness of the resin part at a position overlapping a connection region between the conduction portion and the wiring portion is larger than a thickness of the conductive part. 
     In the application example, the thickness of the resin part is larger than the thickness of the conductive part in the connection region between the conduction portion and the wiring portion. The resin part is thicker than the conductive part as mentioned above, and thus the conduction portion can be easily deformed. Consequently, the stress of when the wiring portion is brought into contact with the conduction portion can be alleviated, and thus it is possible to suppress the occurrence of strain of the first substrate and the second substrate. Since a thickness of the conductive part is small, and thus the resin part is easily deformed, for example, even if an error occurs in a thickness of the wiring portion, the wiring portion can be brought into close contact with the conduction portion due to deformation of the resin part, and thus it is possible to improve the connection reliability. 
     In the mounting structure according to the application example, it is preferable that the resin part has a substantially hemispherical shape protruding from the second surface in a case where the conduction portion is not elastically deformed, and, if the maximum diameter of an end surface of the resin part on the second substrate side is indicated by L, a distance d from the second substrate to the functional element satisfies a relationship of d&gt;L/2. 
     In the application example, the resin part has the substantially hemispherical shape protruding from the second surface in a state of not being elastically deformed. If the maximum diameter (that is, a diameter) of the end surface of the resin part on the second substrate side is indicated by L, the distance d from the second substrate to the functional element satisfies the relationship of d&gt;L/2. In other words, the distance d is larger than a radius of the resin part before being elastically deformed. 
     In this configuration, the conduction portion is elastically deformed, and thus the maximum value of a distance between a tip end thereof and the second substrate is about L/2 (that is, the radius of the resin part). Therefore, the distance d from the second substrate to the functional element is made larger than L/2, and thus it is possible to further suppress interference between the conduction portion and the functional element. 
     The conduction portion may be formed by forming the resin part by heating, melting, and then solidifying a resin, and by coating the resin part with the conductive part. 
     In the mounting structure according to the application example, it is preferable that the wiring portion and the conduction portion intersect each other in plan view in a first direction directed from the first substrate to the second substrate. 
     In the application example, the wiring portion and the conduction portion intersect each other in the plan view. Consequently, a position difference between the first substrate and the second substrate is allowable in a plane intersecting the first direction during wiring connection, and thus it is possible to prevent defective connection from occurring. In other words, in the application example, it is possible to increase an allowable amount for a position difference, compared with a case where the wiring portion and the conduction portion do not intersect each other (for example, a case where the wiring portion and the conduction portion are parallel to each other or have point connection) in the plan view. Thus, alignment between the first substrate and the second substrate can be easily performed, and wiring connection can also be easily performed. It is possible to improve connection reliability. 
     In the mounting structure according to the application example, it is preferable that at least one of the wiring portion and the conduction portion includes a resin part and a conductive part covering at least a part of the resin part. 
     In the application example, at least one of the conduction portion and the wiring portion includes the resin part and the conductive part covering the resin part. In this configuration, when the conduction portion is brought into contact with the wiring portion, the resin part can be elastically deformed, and one of the wiring portion and the conduction portion can be deformed along the other thereof. Therefore, it is possible to improve close contact between the conduction portion and the wiring portion, and thus it is possible to improve connection reliability. 
     In the mounting structure according to the application example, it is preferable that one of the wiring portion and the conduction portion has a second direction, which is parallel to the first surface, as a longitudinal direction, the other of the wiring portion and the conduction portion has a third direction, which is parallel to the first surface and intersects with the second direction, as a longitudinal direction, and, in the second direction, a dimension of the conductive part is larger than a dimension of the other of the wiring portion and the conduction portion. 
     In the application example, one of the conduction portion has the second direction as the longitudinal direction, and the other thereof has the third direction as the longitudinal direction. In the second direction, a dimension of the conductive part is larger than a dimension of the other of the wiring portion and the conduction portion. Consequently, it is possible to maintain connection reliability on the basis of the elastic force while allowing a position difference between the first substrate and the second substrate in the second direction during wiring connection in the second direction. 
     In the mounting structure according to the application example, it is preferable that the conduction portion has the resin part and a conductive part covering the resin part, the first substrate is provided with an extraction wiring that is connected to the functional element and is smaller than the wiring portion in a thickness in the first direction directed from the first substrate to the second substrate, the mounting structure further including: a second conduction portion that is connected to the extraction wiring; a second resin part which is larger than the resin part in a thickness in the first direction directed from the first substrate to the second substrate; and a second conductive part, which covers the second resin part. 
     In the application example, the conduction portion has a configuration in which the resin part is covered with the conductive part. The second conduction portion has a configuration in which the second resin part larger than the second conductive part in thickness is covered with the second conductive part. The second conduction portion is brought into contact with and is connected to the extraction wiring smaller than the wiring portion in dimension in the first direction. Here, the second conduction portion is larger than the conduction portion in thickness in the first direction directed from the first substrate to the second substrate. Therefore, in a case of the same deformation amount in the first direction during the connection, a contact area between the second conduction portion and the extraction wiring may be larger than a contact area between the conduction portion and the wiring portion. Further, it is possible to reduce the contact resistance, and thus it is possible to increase a current amount. As mentioned above, the extraction wiring is provided to be smaller than the wiring portion in dimension, and thereby it is possible to perform the wiring connection using the second conduction portion larger than the conduction portion, and thus it is possible to reduce the contact resistance. 
     In the mounting structure according to the application example, it is preferable that the wiring portion is made of a metal material, and a ratio of a height of the first surface in a normal direction to a width of the first surface in a surface direction is 0.1 or more and 5 or less. 
     In the application example, in the wiring portion, the ratio (aspect ratio) of the height of the first surface in the normal direction to the width of the first surface in the surface direction is 0.1 or more and 5 or less. Consequently, it is possible to prevent the wiring portion from being deformed when force is applied from the conduction portion, and thus it is possible to improve the reliability of electrical connection. 
     In the mounting structure according to the application example, it is preferable that the functional element includes a vibrator that vibrates along a first direction directed from the first substrate to the second substrate. 
     In the application example, the functional element is configured to include the vibrator. Also in this configuration, as described above, it is possible to suppress interference between the conduction portion and the functional element. In other words, it is possible to prevent the conduction portion from hindering vibration of the vibrator, and thus it is possible to appropriately drive the vibrator. 
     In the mounting structure according to the application example, it is preferable that a connection position between the wiring portion and the conduction portion is located further toward the second substrate side than a vibration range of the vibrator in the first direction. 
     In the application example, a connection position between the wiring portion and the conduction portion is located further toward the second substrate side than a vibration range of the vibrator provided on the first substrate. In this configuration, the conduction portion can be disposed outside the drive range of the vibrator. Consequently, it is possible to further prevent the conduction portion from hindering vibration of the vibrator, and thus it is possible to appropriately drive the vibrator. 
     In the mounting structure according to the application example, it is preferable that the functional element is an ultrasonic transducer including a flexible film formed on the first substrate, and the vibrator provided on the flexible film. 
     In the application example, the functional element is the ultrasonic transducer that is configured to include the flexible film and the vibrator. In this configuration, as described above, it is possible to prevent the conduction portion from hindering vibration of the vibrator, and thus it is possible to appropriately drive the ultrasonic transducer. 
     It is preferable that the mounting structure according to the application example further includes a bonding portion that bonds the first substrate to the second substrate, the first substrate has a functional region in which a plurality of the functional elements are formed, and the bonding portion bonds the first substrate to the second substrate in the functional region. 
     In the application example, the bonding portion bonds the first substrate to the second substrate in the functional region in which the functional element is formed. Consequently, for example, even in a case where a plurality of conduction portions and wiring portions are provided in the functional region, that is, a plurality of connection positions are present, the uniformity of a distance between the first substrate and the second substrate in the functional region can be improved, and thus the connection reliability at each connection position can be improved. 
     An ultrasonic device according to an application example includes: a first substrate that has a first surface on which a vibrator is provided; a wiring portion that is provided at a position, which is different from a position of the vibrator on the first surface, and is conductively connected to the vibrator; a second substrate that has a second surface that is opposite to the first surface; and a conduction portion that is provided on the second surface, is connected to the wiring portion, and is conductively connected to the vibrator. The shortest distance between the vibrator and the second substrate is longer than the longest distance between the second substrate and a position where the wiring portion is connected to the conduction portion. 
     In the application example, the vibrator and the wiring portion and the conduction portion, which are conductively connected to the vibrator, are provided on the first surface of the first substrate. The conduction portion connected to the wiring portion is provided on the second surface of the second substrate. The shortest distance between the vibrator and the second substrate is longer than the longest distance between the second substrate and the position where the wiring portion is connected to the conduction portion. In this configuration, similar to the application example, it is possible to suppress interference between the conduction portion and the vibrator, it is possible to easily perform wiring connection between the first substrate and the second substrate, and also it is possible to easily manufacture an ultrasonic device. 
     An ultrasonic probe according to an application example includes: a first substrate that has a first surface on which a vibrator is provided; a wiring portion that is provided at a position, which is different from a position of the vibrator on the first surface, and is conductively connected to the vibrator; a second substrate that has a second surface that is opposite to the first surface; a conduction portion that is provided on the second surface, is connected to the wiring portion, and is conductively connected the vibrator; and a case in which the first substrate, the wiring portion, the second substrate, and the conduction portion are stored. The shortest distance between the vibrator and the second substrate is longer than the longest distance between the second substrate and a position where the wiring portion is connected to the conduction portion. 
     In the application example, the vibrator and the wiring portion and the conduction portion, which are conductively connected to the vibrator, are provided on the first surface of the first substrate. The conduction portion connected to the wiring portion is provided on the second surface of the second substrate. The shortest distance between the vibrator and the second substrate is longer than the longest distance between the second substrate and the position where the wiring portion is connected to the conduction portion. In this configuration, similar to the application example, it is possible to suppress interference between the conduction portion and the vibrator, it is possible to easily perform wiring connection between the first substrate and the second substrate, and also it is possible to easily manufacture an ultrasonic probe. 
     An ultrasonic apparatus according to an application example includes: a first substrate that has a first surface on which a vibrator is provided; a wiring portion that is provided at a position, which is different from a position of the vibrator on the first surface, and is connected to the vibrator; a second substrate that has a second surface that is opposite to the first surface; a conduction portion that is provided on the second surface, is connected to the wiring portion, and is conductively connected to the vibrator; and a controller that controls the vibrator. The shortest distance between the vibrator and the second substrate is longer than the longest distance between the second substrate and a position where the wiring portion is connected to the conduction portion. 
     In the application example, the vibrator and the wiring portion and the conduction portion, which are conductively connected to the vibrator, are provided on the first surface of the first substrate. The conduction portion connected to the wiring portion is provided on the second surface of the second substrate. The shortest distance between the vibrator and the second substrate is longer than the longest distance between the second substrate and the position where the wiring portion is connected to the conduction portion. In this configuration, similar to the application example, it is possible to suppress interference between the conduction portion and the vibrator, it is possible to easily perform wiring connection between the first substrate and the second substrate, and also it is possible to easily manufacture an ultrasonic apparatus. 
     An electronic apparatus according to an application example includes: a first substrate that has a first surface on which a functional element is provided; a wiring portion that is provided at a position, which is different from a position of the functional element on the first surface, and is conductively connected to the functional element; a second substrate that has a second surface that is opposite to the first surface; and a conduction portion that is provided on the second surface, is connected to the wiring portion, and is conductively connected to the functional element; and a controller that controls the functional element. The shortest distance between the functional element and the second substrate is longer than the longest distance between the second substrate and a position where the wiring portion is connected to the conduction portion. 
     In the application example, the functional element and the wiring portion and the conduction portion, which are conductively connected to the functional element, are provided on the first surface of the first substrate. The conduction portion connected to the wiring portion is provided on the second surface of the second substrate. The shortest distance between the functional element and the second substrate is longer than the longest distance between the second substrate and the position where the wiring portion is connected to the conduction portion. In this configuration, similar to the application example, it is possible to suppress interference between the conduction portion and the functional element, it is possible to easily perform wiring connection between the first substrate and the second substrate, and also it is possible to easily manufacture an ultrasonic apparatus. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a perspective view showing a schematic configuration of an ultrasonic apparatus according to a first embodiment. 
         FIG.  2    is a block diagram showing a schematic configuration of the ultrasonic apparatus according to the first embodiment. 
         FIG.  3    is a plan view showing a schematic configuration of an element substrate in an ultrasonic device according to the first embodiment. 
         FIG.  4    is a sectional view of the ultrasonic device taken along the line A-A in  FIG.  3   . 
         FIG.  5    is a sectional view showing a schematic configuration of main portions of the ultrasonic device according to the first embodiment. 
         FIG.  6    is a plan view showing a schematic configuration of a sealing plate in the ultrasonic device according to the first embodiment. 
         FIG.  7    is a flowchart showing an example of a manufacturing method of the ultrasonic device according to the first embodiment. 
         FIG.  8    illustrates sectional views schematically showing an example of a manufacturing process of the ultrasonic device according to the first embodiment. 
         FIG.  9    illustrates sectional views schematically showing an example of a manufacturing process of the ultrasonic device according to the first embodiment. 
         FIG.  10    illustrates sectional views schematically showing an example of a manufacturing process of the ultrasonic device according to the first embodiment. 
         FIG.  11    illustrates sectional views schematically showing an example of a manufacturing process of the ultrasonic device according to the first embodiment. 
         FIG.  12    illustrates sectional views schematically showing an example of a manufacturing process of the ultrasonic device according to the first embodiment. 
         FIG.  13    is a sectional view showing a schematic configuration of main portions of an ultrasonic device according to a second embodiment. 
         FIG.  14    is a sectional view showing a schematic configuration of main portions of the ultrasonic device according to the second embodiment. 
         FIG.  15    is a perspective view showing a schematic configuration of main portions of the ultrasonic device according to the second embodiment. 
         FIG.  16    is a sectional view showing a schematic configuration of an ultrasonic device according to a first modification example. 
         FIG.  17    is a sectional view showing a schematic configuration of an ultrasonic device according to a second modification example. 
         FIG.  18    is a sectional view showing a schematic configuration of an ultrasonic device according to a third modification example. 
         FIG.  19    is a sectional view showing a schematic configuration of an ultrasonic device according to a fourth modification example. 
         FIG.  20    is a sectional view showing a schematic configuration of an ultrasonic device according to a fifth modification example. 
         FIG.  21    is a sectional view showing a schematic configuration of the ultrasonic device according to the fifth modification example. 
         FIG.  22    is a sectional view showing a schematic configuration of an ultrasonic device according to another modification example. 
         FIG.  23    is a sectional view showing a schematic configuration of an ultrasonic device according to still another modification example. 
         FIG.  24    is a sectional view showing a schematic configuration of an ultrasonic device according to still another modification example. 
         FIG.  25    is a sectional view showing a schematic configuration of an ultrasonic device according to still another modification example. 
         FIG.  26    is a sectional view showing a schematic configuration of an ultrasonic device according to still another modification example. 
     
    
    
     DETAILED DESCRIPTION 
     First Embodiment 
     Hereinafter, a description will be made of an ultrasonic measuring apparatus according to a first embodiment of an ultrasonic apparatus with reference to the drawings. 
       FIG.  1    is a perspective view showing a schematic configuration of an ultrasonic measuring apparatus  1  of the embodiment.  FIG.  2    is a block diagram showing a schematic configuration of the ultrasonic measuring apparatus  1 . 
     As shown in  FIG.  1   , the ultrasonic measuring apparatus  1  of the embodiment includes an ultrasonic probe  2  and a control device  10  that is electrically connected to the ultrasonic probe  2  via a cable  3 . 
     In the ultrasonic measuring apparatus  1 , the ultrasonic probe  2  is brought into close contact with a surface of a living body (for example, a human body), and an ultrasonic wave is transmitted into the living body from the ultrasonic probe  2 . An ultrasonic wave reflected at an organ of the living body is received by the ultrasonic probe  2 , and, for example, an internal tomographic image of the living body is acquired, or a state (for example, a blood flow) of an organ of the living body is measured, on the basis of received signals. 
     Configuration of Ultrasonic Probe 
     The ultrasonic probe  2  corresponds to an ultrasonic probe and includes a case  21 , an ultrasonic device  22  stored in the case  21 , and a circuit substrate  23  (refer to  FIG.  2   ) provided with a driver circuit and the like for controlling the ultrasonic device  22 . An ultrasonic sensor  24  is formed of the ultrasonic device  22  and the circuit substrate  23 , and the ultrasonic sensor  24  forms an ultrasonic module. 
     Configuration of Case 
     As shown in  FIG.  1   , the case  21  is formed, for example, in a rectangular box shape in plan view, and a sensor window  21 B is provided on one surface (sensor surface  21 A) which is orthogonal to a thickness direction, and a part of the ultrasonic device  22  is exposed. A passing hole  21 C of the cable  3  is provided at a part of the case  21  (a side surface in the example shown in  FIG.  1   ), and the cable  3  is connected to the circuit substrate  23  inside the case  21  through the passing hole  21 C. A gap between the cable  3  and the passing hole  21 C is filled with, for example, a resin material, and thus water resistance is ensured. 
     In the embodiment, a configuration example in which the ultrasonic probe  2  and the control device  10  are connected to each other via the cable  3  is described, but, this is only an example, and, for example, the ultrasonic probe  2  and the control device  10  may be connected to each other through wireless communication, and various constituent elements of the control device  10  may be provided in the ultrasonic probe  2 . 
     Configuration of Ultrasonic Device 
       FIG.  3    is a plan view in which an element substrate  41  of the ultrasonic device  22  is viewed from a protective film  44  side.  FIG.  4    is a sectional view of the ultrasonic device  22  taken along the line A-A in  FIG.  3   .  FIG.  5    is a sectional view showing a schematic configuration of the periphery of a first conduction portion  421  which will be described below in the ultrasonic device  22 .  FIG.  6    is a plan view schematically showing an ultrasonic transducer  45  viewed from the protective film  44  side. 
     As shown in  FIG.  4   , the ultrasonic device  22  is configured to include the element substrate  41 , a sealing plate  42 , an acoustic matching layer  43 , and the protective film  44 . As shown in  FIG.  4   , the element substrate  41  and the sealing plate  42  of the members are electrically connected to each other via the first conduction portion  421  provided on the sealing plate  42  side and a second conduction portion  424 . 
     As shown in  FIG.  3   , the element substrate  41  is provided with a plurality of ultrasonic transducers  45  which transmit and receive an ultrasonic wave and are disposed in a matrix along an X direction and a Y direction intersecting (in the embodiment, orthogonal to) the X direction. An ultrasonic array AL is formed of the plurality of ultrasonic transducers  45 . 
     Configuration of Element Substrate 
     The element substrate  41  corresponds to a first substrate and includes a substrate main body  411  and a vibration film  412  laminated on the substrate main body  411 . The element substrate  41  is provided with piezoelectric elements  413 , lower electrode connection lines  414 , wiring portions  415 , an upper electrode extraction line  416 , and bonding portions  417  on the vibration film  412  on the sealing plate  42  side. The ultrasonic transducer  45  which transmits and receives an ultrasonic wave is formed of a flexible film  412 A and the piezoelectric element  413  in a vibration region of the vibration film  412  among the constituent elements. In plan view in which the element substrate  41  is viewed from a substrate thickness direction, a central region of the element substrate  41  is an array region Ar 1  in which the ultrasonic array AL formed of a plurality of ultrasonic transducers  45  is provided. The array region Ar 1  corresponds to a functional region. The plurality of ultrasonic transducers  45  are disposed in a matrix in the array region Ar 1 . 
     Here, in the following description, a surface of the element substrate  41  that is opposite to the sealing plate  42  will be referred to as a rear surface  41 A corresponding to a first surface, and a surface on an opposite side to the rear surface  41 A will be referred to as an operation surface  41 B. A normal direction to the operation surface  41 B is substantially the same as the Z direction, and a direction (first direction) from the element substrate  41  toward the sealing plate  42  is substantially parallel to the Z direction. 
     The substrate main body  411  is, for example, a semiconductor substrate made of Si or the like, for example. An opening  411 A corresponding to each ultrasonic transducer  45  is provided in the array region Ar 1  in the substrate main body  411 . The respective openings  411 A are separated by a wall portion  411 B. Each opening  411 A is closed by the vibration film  412  provided on the substrate main body  411  on the protective film  44  side (+Z side). 
     The vibration film  412  is formed of, for example, SiO 2 , or a laminate of SiO 2  and ZrO 2 , and is provided to cover the entire −Z side of the substrate main body  411 . In the vibration film  412 , a portion closing the opening  411 A forms the flexible film  412 A which is elastically deformed. A thickness dimension (thickness) of the vibration film  412  is a sufficiently small thickness dimension (thickness) relative to the substrate main body  411 . In a case where the substrate main body  411  is made of Si, and the vibration film  412  is made of SiO 2 , for example, the substrate main body  411  is subject to oxidation treatment, and thus the vibration film  412  having a desired thickness dimension (thickness) can be easily formed. In this case, the substrate main body  411  is etched with the vibration film  412  of SiO 2  as an etching stopper, and thus the opening  411 A can be easily formed. 
     Each piezoelectric element  413  is provided on the flexible film  412 A of the vibration film  412  closing the openings  411 A. A single ultrasonic transducer  45  is formed of the flexible film  412 A and the piezoelectric element  413 . The piezoelectric element  413  is formed of a laminate of a lower electrode  413 A, a piezoelectric film  413 B, and an upper electrode  413 C. 
     The lower electrode  413 A or the upper electrode  413 C is configured to include a layer made of one or two or more conductive materials. As such a conductive material, for example, electrode materials such as Au, Al, Cu, Ir, Pt, IrOx, Ti, TiW, and TiOx may be used. In the embodiment, for example, the lower electrode  413 A is formed by laminating a TiW layer (50 nm) and a Cu layer (100 nm) in this order on the vibration film  412 . 
     The piezoelectric film  413 B is formed by using, for example, a transition metal oxide having a perovskite structure, more specifically, lead zirconate titanate containing Pb, Ti, and Zr. 
     A rectangular wave voltage with a predetermined frequency is applied between the lower electrode  413 A and the upper electrode  413 C in the ultrasonic transducer  45 , and thus an ultrasonic wave can be transmitted by causing the flexible film  412 A located in the opening region of the opening  411 A to vibrate along the Z direction. If the flexible film  412 A vibrates due to an ultrasonic wave reflected from a target object, a potential difference occurs in the upper and lower portions of the piezoelectric film  413 B. Therefore, the received ultrasonic wave can be detected by detecting the potential difference occurring between the lower electrode  413 A and the upper electrode  413 C. 
     In the embodiment, as shown in  FIG.  3   , among the plurality of ultrasonic transducers  45  disposed along the X direction and the Y direction, two ultrasonic transducers  45  arranged in the Y direction form an ultrasonic transducer group  45 A which is a single transmission/reception channel. In other words, the ultrasonic array AL has a two-dimensional array structure in which the ultrasonic transducer groups  45 A are disposed at the substantially same interval along the X direction and the Y direction. That is, the ultrasonic array AL is a two-dimensional array formed by arranging a plurality of transmission/reception channels along the X direction and the Y direction. 
     Here, the lower electrodes  413 A forming the ultrasonic transducer groups  45 A are connected to each other via the lower electrode connection line  414 . The lower electrode connection line  414  is integrally formed with the respective lower electrodes  413 A and, thus, connects the lower electrodes  413 A to each other. In other words, similar to the lower electrode  413 A, the lower electrode connection line  414  is formed by laminating a TiW layer (50 nm) and a Cu layer (100 nm), and has a thickness dimension (thickness) of 150 nm, for example. The lower electrode connection line  414  may be provided separately from the lower electrode  413 A. 
     The wiring portion  415  is provided on the lower electrode connection line  414  configured as mentioned above. 
     The wiring portion  415  which is conductive includes a main body part  415 A and a coating part  415 B coating the main body part  415 A. As shown in  FIG.  3   , the wiring portion  415  is formed at a position overlapping the wall portion  411 B in plan view viewed from the Z direction and has a substantially rectangular external shape. As shown in  FIGS.  4  and  5   , the wiring portion  415  protrudes from the lower electrode connection line  414  toward the sealing plate  42  side so as to be in contact with and electrically connected to the first conduction portion  421  provided on the sealing plate  42  side. In other words, the lower electrode  413 A of each ultrasonic transducer  45  is electrically connected to the first conduction portion  421  on the sealing plate  42  side via the lower electrode connection line  414  and the wiring portion  415 . A mounting structure is configured to include at least the element substrate  41 , the wiring portion  415 , the sealing plate  42 , and the first conduction portion  421 . 
     The main body part  415 A is formed by using a conductive metal material. The main body part  415 A protrudes toward the sealing plate  42  side from a position overlapping the wall portion  411 B on the lower electrode connection line  414  in plan view viewed from the Z direction. The main body part  415 A is formed by depositing Cu which is the metal material on the lower electrode connection line  414 , for example, according to an electroplating method. The main body part  415 A is formed to be, for example, 10 μm in both of a dimension (width dimension) in the Y direction and a dimension (height dimension) in the Z direction. A width dimension of the wall portion  411 B is, for example, about 20 μm. 
     The coating part  415 B is formed by using a conductive metal material and is formed to cover a surface of the main body part  415 A. The coating part  415 B is formed by laminating a Ni layer (50 nm) and an Au layer (100 nm) from the main body part  415 A side. As mentioned above, the coating part  415 B is formed by using a material such as Au having a relatively high electric conductivity, and thus it is possible to reduce contact resistance with the first conduction portion  421 . 
     The coating part  415 B is not limited to the configuration in which the Ni layer (50 nm) and the Au layer (100 nm) are laminated and may be formed by using various conductive materials. 
     As shown in  FIG.  5   , an end surface (hereinafter, also referred to as an end part  415 C) of the wiring portion  415  on the sealing plate  42  side is located further toward the sealing plate  42  side than an end surface (hereinafter, also referred to as an end part  413 D) on the −Z side of the piezoelectric element  413  of the ultrasonic transducer  45 . In the embodiment, the end part  415 C is located further toward the sealing plate  42  side than a −Z side end part Rz of a vibration range of the ultrasonic transducer  45 . 
     In the wiring portion  415 , a ratio of a dimension (height dimension) in the Z direction to a minimum dimension (a width dimension which is a dimension in the Y direction in the embodiment) in an XY section of the wiring portion  415 , that is, an aspect ratio, is preferably 0.1 or more and 5 or less and is more preferably 0.1 or more and 1 or less. Consequently, it is possible to prevent the wiring portion  415  from being deformed or inclined by pressure from the first conduction portion  421 , and thus to improve the reliability of electrical connection. 
     A planar shape of the wiring portion  415  in plan view viewed from the Z direction is not limited to a rectangular shape and may be a circular shape, an elliptical shape, various polygonal shapes, or the like. 
     Each upper electrode  413 C of the ultrasonic transducer  45  is electrically connected to the upper electrode extraction line  416  and is electrically connected to the second conduction portion  424  on the sealing plate  42  side in a wiring region Ar 2  outside the array region Ar 1 . 
     The upper electrode extraction line  416  which corresponds to an extraction wire and is made of a conductive material is integrally formed with, for example, the upper electrode  413 C and includes a plurality of extraction portions  416 A disposed along the Y direction, connection portions  416 B connecting the extraction portions  416 A and the upper electrodes  413 C to each other, and electrical connection portions  416 C disposed in the wiring region Ar 2 . 
     For example, as shown in  FIG.  3   , each of the extraction portions  416 A is disposed between the odd-numbered and even-numbered ultrasonic transducer groups  45 A, for example, when counted along the X direction, and the upper electrodes  413 C of the ultrasonic transducer groups  45 A are connected to each other via the connection portion  416 B. 
     The electrical connection portions  416 C are formed outside of the array region Ar 1  such as in the wiring regions Ar 2  in outer peripheral portions of the element substrate  41  on the ±Y sides and are connected to the extraction portions  416 A. In  FIG.  3   , only the electrical connection portion  416 C on the +Y side is shown. The electrical connection portion  416 C is in contact with and is electrically connected to the second conduction portion  424  (refer to  FIG.  4   ) provided on the sealing plate  42  side. In other words, the upper electrode  413 C is electrically connected to the second conduction portion  424  on the sealing plate  42  side via the upper electrode extraction line  416 . Each upper electrode  413 C is connected to a ground circuit (not shown) of the circuit substrate  23  via a wiring formed on the sealing plate  42  and is set as a reference potential. 
     Since the electrical connection portion  416 C is formed in the wiring region Ar 2  in the outer peripheral portion of the element substrate  41 , the electrical connection portion can be more increased in a width dimension (dimension in the Y direction) than the electrical connection portion that is formed in the array region Ar 1 . In the embodiment, the electrical connection portion  416 C has a larger width dimension than a dimension (width dimension) of the wiring portion  415  in the Y direction large, which is connected to the first conduction portion  421 . Thus, it is possible to increase a contact area with the second conduction portion  424 , and thus it is possible to reduce contact resistance with the second conduction portion  424 . The electrical connection portion  416 C is formed by using a conductive material such as Au having a relatively high electric conductivity, and thus it is possible to more reduce the contact resistance. 
     The bonding portion  417  bonds the element substrate  41  configured as described above to the sealing plate  42 . The bonding portion  417  includes a first bonding part  417 A that is disposed along the outer edge of the element substrate  41  and a second bonding part  417 B that is disposed along the ultrasonic transducer  45 . 
     The bonding portion  417  is formed by using a material which can bond the element substrate  41  to the sealing plate  42 , for example, various adhesives or a resin material such as a photosensitive resin material (photoresist). In the embodiment, the bonding portion  417  is formed by using a photosensitive resin material. Consequently, the bonding portion  417  can be formed at a desired position in a desired shape. 
     As shown in  FIG.  3    as an example, the second bonding parts  417 B are disposed along the X direction at the positions overlapping the wall portions  411 B on the surface of the vibration film  412  on the sealing plate  42  side. The first bonding part  417 A and the second bonding part  417 B are formed on the vibration film  412 , that is, in the region in which the upper electrode extraction line  416  and the like are not formed. Consequently, thickness dimensions (thicknesses) the first bonding part  417 A and the second bonding part  417 B can be made uniform regardless of a formation position. 
     The second bonding part  417 B is disposed between the extraction portions  416 A of the upper electrode extraction line  416 , that is, the second bonding parts are disposed at positions with each wiring portion  415  interposed therebetween in the Y direction. In this configuration, the second bonding parts  417 B can be disposed such that distances between the respective wiring portions  415  and the second bonding parts  417 B are the same as each other. Therefore, the stress from the second bonding parts  417 B can be substantially uniformly applied to the respective connection positions of the wiring portions  415 . 
     The second bonding parts  417 B may be formed along the X direction. The second bonding parts  417 B are not limited to the configuration of being directly provided on the vibration film  412  and may be disposed on the extraction portion  416 A of the upper electrode extraction line  416  along the X direction. 
     Further, the second bonding parts  417 B may be disposed with each of the wiring portions  415  interposed therebetween in the Y direction, for example, may be disposed on the +Y side of the wiring portions  415 . The second bonding part  417 B is formed in at least the array region Ar 1 , and thus the connection reliability between the wiring portion  415  and the first conduction portion  421  can be improved compared with a case where only the first bonding part  417 A is provided. 
     Configuration of Sealing Plate 
     The sealing plate  42  shown in  FIGS.  4  to  6    corresponds to a second substrate, is provided for reinforcing the strength of the element substrate  41 , for example, is configured of a semiconductor substrate or the like, and is bonded to the element substrate  41  with the bonding portion  417 . A material or a thickness of the sealing plate  42  influences frequency characteristics of the ultrasonic transducer  45 , and is thus preferably set on the basis of a center frequency of a transmitted and received ultrasonic wave. 
     The sealing plate  42  is provided with the first conduction portion  421  corresponding to the conduction portion, a first through-electrode  422 , a lower electrode wire  423 , the second conduction portion  424  corresponding to the second conduction portion, a second through-electrode  425 , and an upper electrode wire  426 . 
     Configuration of First Conduction Portion 
     The first conduction portion  421  shown in  FIGS.  4  to  6    corresponds to the connection portion, is provided on a surface (corresponding to a second surface, hereinafter, also referred to as an inner surface  42 A) of the sealing plate  42  on the element substrate  41  side, is in pressure and close contact with the wiring portion  415  provided on the element substrate  41 , and is electrically connected to the wiring portion  415 . The first conduction portion  421  includes a first resin part  421 A and a first conductive film  421 B that covers the first resin part  421 A and is electrically connected to the first through-electrode  422 . 
     The first resin part  421 A corresponds to a resin part, is provided on the inner surface  42 A at a position overlapping each of the wiring portions  415  as shown in  FIG.  5   , and protrudes from the inner surface  42 A toward the element substrate  41 . The first resin part  421 A is made of an elastic resin material and is formed in a substantially hemispherical shape by thermally melting a resin material disposed on the inner surface  42 A as will be described below. The first resin part  421 A may be formed in a substantially trapezoidal shape (a state in which corners of a trapezoid are rounded) according to the kind of resin material, or a temperature condition in thermal melting. 
     A photosensitive resin material (photoresist) is used as a material of which the first resin part  421 A is formed. In this case, the first resin part  421 A may be formed in a desired shape at a desired position. As a material of which the first resin part  421 A is formed, not only a photosensitive resin material, but also various elastic resin materials, for example, polyimide resin, acrylic resin, phenol resin, epoxy resin, silicone resin, and modified polyimide resin may be used. 
     The first conductive film  421 B corresponds to the conductive part, is made of a conductive material, and coats the first resin part  421 A. The first conductive film  421 B extends to a formation position of the first through-electrode  422  along the Y direction and is connected to the first through-electrode  422 . A thickness of the first conductive film  421 B is made sufficiently smaller than a thickness of the first resin part  421 A, and thus the first conductive film  421 B can be deformed according to elastic deformation of the first resin part  421 A. 
     As a conductive material of which the first conductive film  421 B is formed, Au, Ag, TiW, Cu, Ni, Pd, Al, Cr, Ti, W, NiCr, a lead-free solder, or the like may be used. In the embodiment, for example, the first conductive film  421 B is formed by laminating a TiW layer (50 nm) and an Au layer (100 nm) in this order from the inner surface  42 A side. In this configuration, the Au layers located on the respective surfaces of the first conductive film  421 B and the coating part  415 B of the wiring portion  415  can be bonded to each other through diffusion bonding. Consequently, the reliability of electrical connection between the first conduction portion  421  and the wiring portion  415  can be further improved. 
     As shown in  FIGS.  4  and  5   , the first conduction portion  421  configured as mentioned above is in pressure contact with the end part  415 C of the wiring portion  415 , and thus the first resin part  421 A and the first conductive film  421 B are elastically deformed. In this case, the +Z side end part of the first conduction portion  421  is deformed along the end part  415 C and is thus in close contact with the end part  415 C in a first connection region C 1  (refer to  FIG.  6   ). As mentioned above, since the first resin part  421 A and the first conductive film  421 B are elastic, the first conduction portion  421  and the end part  415 C can be made in close contact with each other, and thus it is possible to improve the reliability of electrical connection between the first conduction portion  421  and the wiring portion  415 . 
     Here, as shown in  FIG.  5   , a connection position between the first conduction portion  421  and the wiring portion  415  is located further toward the sealing plate  42  side than the end part  413 D of the piezoelectric element  413 , similar to the end part  415 C of the wiring portion  415 . In other words, in this configuration, the shortest distance (a distance of a location where a distance between the end part  413 D of the piezoelectric element  413  and the sealing plate  42  is shortest) between the end part  413 D of the piezoelectric element  413  and the sealing plate  42  is longer than the longest distance (a distance of a location where a distance between the connection position and the sealing plate  42  is longest) between the sealing plate  42  and the connection position where the first conduction portion  421  and the wiring portion  415  are connected to each other. Further in other words, in this configuration, the shortest distance between the end part  413 D of the piezoelectric element  413  and the inner surface  42 A of the sealing plate  42  is longer than the longest distance between the connection position where the first conduction portion  421  is connected to the wiring portion  415  and the inner surface  42 A of the sealing plate  42 . In the embodiment, the connection position is located further toward the sealing plate  42  side than the −Z side end part Rz of the vibration range of the ultrasonic transducer  45 . Consequently, it is possible to suppress interference between the ultrasonic transducer  45  and the first conduction portion  421 . The first conduction portion  421  is in contact with the end part  415 C of the wiring portion  415 , and thus wiring connection between the element substrate  41  and the sealing plate  42  can be performed. Therefore, as described above, the connection position is located further toward the sealing plate  42  side than the piezoelectric element  413 , and thus wiring connection can be easily performed. Since a connection position can be set according to a dimension of the wiring portion  415 , it is possible to easily adjust a connection position according to the piezoelectric element  413 . 
     The first conduction portion  421  has a curved part  421 C which is curved toward the sealing plate  42  from the first connection region C 1  (in a case where the end part  415 C of the wiring portion  415  is flat, the connection position where the first conduction portion  421  is connected to the wiring portion  415  is the first connection region C 1  in plan view) to the outside in the surface direction (a surface direction of the XY plane) of the rear surface  41 A. That is, the curved part  421 C is curved to be separated from the piezoelectric element  413  toward the piezoelectric element  413  side along the XY plane. In other words, an area of the region in which the first conduction portion  421  is bonded to the sealing plate  42  is larger than an area of the region (first connection region C 1 ) in which the wiring portion  415  is connected to the first conduction portion  421 . Further in other words, of perpendicular lines that can be drawn from a region occupied when the piezoelectric element  413  is projected in the first direction to the first conduction portion  421 , a perpendicular line that can be drawn to a position at which the first conduction portion  421  is bonded to the sealing plate  42  is shorter than a perpendicular line that can be drawn to a position at which the wiring portion  415  is connected to the first conduction portion  421 . Consequently, it is possible to suppress interference between the ultrasonic transducer  45  and the first conduction portion  421 . 
     Further, the first resin part  421 A is substantially hemispherical during formation, and the end surface (surface of the first resin part  421 A that comes into contact with the sealing plate  42 ) on the inner surface  42 A is substantially circular. In a case where a diameter (that is, the maximum dimension or the maximum diameter) of the end surface is indicated by L 1 , a distance d 1  from the sealing plate  42  to the −Z side end part Rz of the vibration range of the ultrasonic transducer  45  satisfies the following Expression (1). Consequently, it is possible to further suppress interference between the ultrasonic transducer  45  and the first conduction portion  421 . In other words, in a case where the first conduction portion  421  is not elastically deformed, a tip end thereof on the +Z side is located at a distance of about L 1 /2 from the sealing plate  42 . Therefore, since the distance d 1  satisfies the following Expression (1), the first conduction portion  421  can be disposed outside the drive range of the ultrasonic transducer  45 . 
     Since the first conduction portion  421  is elastically deformed in practice, a distance from the sealing plate  42  to the tip end on the +Z side is smaller than L 1 /2. Therefore, a distance d 2  between the end part  413 D of the piezoelectric element  413  and the sealing plate  42  during drive stoppage satisfies the following Expression (2), and thus it is also possible to suppress interference between the ultrasonic transducer  45  and the first conduction portion  421 . 
       Expression 1:  d 1&gt; L   1 /2  (1)
 
         d 2&gt; L   1 /2  (2)
 
     Configurations of First Through-Electrode and Lower Electrode Wire 
     As shown in  FIGS.  4  to  6   , a pair of first through-electrodes  422  are provided at positions with the first resin part  421 A interposed therebetween along the Y direction and may be, for example, a Si through-electrode (through-silicon via: TSV) or may employ a configuration in which a through-hole is filled with a conductive material. The lower electrode wire  423  is individually formed with respect to each first through-electrode  422  on the −Z side surface (hereinafter, referred to as an outer surface  42 B) of the sealing plate  42 . The lower electrode wire  423  is connected to the first through-electrode  422  and is connected to the circuit substrate  23  via a wiring (not shown) formed along the outer surface  42 B. 
     At least one first through-electrode  422  may be formed, and three or more through-electrodes may be formed. A position where the first through-electrode  422  is formed is not limited to the above-described position, and the first through-electrode may be formed on, for example, the +X side or −X side of the first resin part  421 A in plan view viewed from the Z direction. 
     Configuration of Second Conduction Portion 
     The second conduction portion  424  shown in  FIGS.  4  and  6    corresponds to a second conduction portion, is provided on the inner surface  42 A of the sealing plate  42 , is in pressure and close contact with the electrical connection portion  416 C of the upper electrode extraction line  416  provided on the element substrate  41 , and is electrically connected to the electrical connection portion  416 C. The second conduction portion  424  includes a second resin part  424 A and a second conductive film  424 B and is configured in the substantially same manner as the first conduction portion  421  although having a larger size than that of the first conduction portion  421 . A dimension (height dimension) of the second conduction portion  424  in the Z direction in a case without elastic deformation is substantially equal to a sum of a dimension (height) of the first conduction portion  421  and a dimension (height) of the wiring portion  415 . 
     The second resin part  424 A corresponds to a second resin part, and a plurality of second resin parts are provided on the inner surface  42 A at a positions overlapping the electrical connection portion  416 C as shown in  FIG.  6    and protrude from the inner surface  42 A toward the element substrate  41 . Similar to the first resin part  421 A, the second resin part  424 A is formed by using an elastic resin material. 
     Here, similar to the first resin part  421 A, the second resin part  424 A is formed in a substantially hemispherical shape (the second resin part  424 A may be formed in a substantially trapezoidal shape according to the kind of resin material or a temperature condition in thermal melting), and an end surface (a surface of the second resin part  424 A that comes into contact with the sealing plate  42 ) on the inner surface  42 A side is substantially circular. A diameter (that is, the maximum dimension or the maximum diameter) L 2  (refer to  FIG.  4   ) is set to be larger than the diameter L 1  of the first resin part  421 A (refer to  FIG.  5   ). At least one second resin part  424 A may be formed at a position of overlapping the electrical connection portion  416 C. 
     Similar to the first conductive film  421 B, the second conductive film  424 B corresponds to a second conductive part, is made of a conductive material, and coats the second resin part  424 A. The second conductive film  424 B extends to a formation position of the second through-electrode  425  and is connected to the second through-electrode. A thickness of the second conductive film  424 B is made sufficiently smaller than a thickness of the second resin part  424 A, and thus the second conductive film  424 B can be deformed according to elastic deformation of the second resin part  424 A. In a case where the surface of the electrical connection portion  416 C and the surface of the second conductive film  424 B are formed of the Au layers, the second conduction portion  424  can be bonded to the electrical connection portion  416 C through diffusion bonding between the Au layers. 
     As illustrated in  FIG.  4   , the second conduction portion  424  configured as mentioned above is in pressure contact with the electrical connection portion  416 C and thus is elastically deformed. In this case, the +Z side end part of the second conduction portion  424  is deformed along the electrical connection portion  416 C and is thus in close contact with the electrical connection portion  416 C in a second connection region C 2  (refer to  FIG.  6   ). As mentioned above, since the first resin part  421 A and the first conductive film  421 B are elastic, the first conduction portion  421  and the end part  415 C can be made in close contact with each other, and thus it is possible to improve the reliability of electrical connection between the second conduction portion  424  and the electrical connection portion  416 C. 
     Configurations of Second Through-Electrode and Upper Electrode Wire 
     As shown in  FIGS.  4  and  6   , the second through-electrode  425  is disposed in the vicinity of the second resin part  424 A. The upper electrode wire  426  is individually formed with respect to each second through-electrode  425  on the outer surface  42 B of the sealing plate  42 . The upper electrode wire  426  is connected to the second through-electrode  425  and is connected to the circuit substrate  23  via a wiring (not shown) formed along the outer surface  42 B. 
     Configurations of Acoustic Matching Layer and Protective Film 
     The acoustic matching layer  43  is disposed on the element substrate  41  on the operation surface  41 B side. In the embodiment, the acoustic matching layer  43  fills the opening  411 A formed on the operation surface  41 B side. 
     The protective film  44  is provided on the element substrate  41  and the acoustic matching layer  43 , so as to protect the element substrate  41  and the acoustic matching layer  43 . As shown in  FIG.  1   , the protective film  44  is exposed to the outside from the sensor window  21 B of the case  21  and is brought into contact with a living body surface during ultrasonic measurement. 
     The acoustic matching layer  43  or the protective film  44  causes an ultrasonic wave transmitted from the ultrasonic transducer  45  to propagate through a living body, which is a measurement target, with high efficiency and causes an ultrasonic wave reflected inside the living body to propagate to the ultrasonic transducer  45  with high efficiency. Thus, acoustic impedance of the acoustic matching layer  43  and the protective film  44  is set to a value similar to acoustic impedance of the living body. 
     Configuration of Circuit Substrate 
     The circuit substrate  23  is provided with a driver circuit or the like which is bonded to the ultrasonic device  22  so as to control the ultrasonic transducer  45 . As illustrated in  FIG.  2   , the circuit substrate  23  includes a selection circuit  231 , a transmitting circuit  232 , and a receiving circuit  233 . 
     In the embodiment, a wiring connected to the upper electrode  413 C which is a common electrode of the ultrasonic transducers  45  is connected to a ground circuit or the like in the circuit substrate  23 , for example. Consequently, the upper electrode  413 C is set to a predetermined common potential (for example, 0 potential). 
     The selection circuit  231  is connected to the lower electrode wire  423  extracted from each ultrasonic transducer group  45 A. The selection circuit  231  switches between connection states transmitting connection for connecting the ultrasonic sensor  24  to the transmitting circuit  232  and receiving connection for connecting the ultrasonic sensor  24  to the receiving circuit  233  under the control of the control device  10 . 
     When the connection is switched to the transmitting connection in accordance with the control of the control device  10 , the transmitting circuit  232  outputs a transmitting signal indicating that the ultrasonic wave is transmitted to the ultrasonic sensor  24  via the selection circuit  231 . 
     When the connection is switched to the receiving connection in accordance with the control of the control device  10 , the receiving circuit  233  outputs a received signal input from the ultrasonic sensor  24  via the selection circuit  231 , to the control device  10 . The receiving circuit  233  is configured to include, for example, a low-noise amplification circuit, a voltage controlled alternator, a programmable gain amplifier, a low-pass filter, and an A/D converter, performs various signal processes such as conversion of the received signal into a digital signal, removal of a noise component, and amplification to a desired signal level, and then outputs the processed received signal to the control device  10 . 
     Configuration of Control Device 
     As shown in  FIG.  2   , the control device  10  corresponds to a controller and is configured to include, for example, an operation unit  11 , a display unit  12 , a storage unit  13 , and a calculation unit  14 . The control device  10  may employ, for example, a terminal device such as a tablet terminal, a smartphone, or a personal computer and may be a dedicated terminal device for operating the ultrasonic probe  2 . 
     The operating unit  11  is a user interface (UI) through which a user operates the ultrasonic measuring apparatus  1  and may be formed of, for example, a touch panel provided on the display unit  12 , operation buttons, a keyboard, and a mouse. 
     The display unit  12  is formed of, for example, a liquid crystal display and displays an image. 
     The storage unit  13  stores various programs or various pieces of data for controlling the ultrasonic measuring apparatus  1 . 
     For example, the calculation unit  14  is configured to have an arithmetic circuit such as a central processing unit (CPU), and the storage circuit such as a memory. The calculation unit  14  reads various programs stored in the storage unit  13  and executes the programs so as to control processes for causing the transmitting circuit  232  to generate and output a transmission signal, and to perform control for setting of a frequency of a received signal or gain setting in the receiving circuit  233 . 
     Manufacturing Method of Ultrasonic Device 
     Hereinafter, a description will be made of a manufacturing method of the above-described ultrasonic device  22 . 
       FIG.  7    is a flowchart showing an example of a manufacturing method of the ultrasonic device  22 .  FIGS.  8  to  12 C  illustrate views schematically showing manufacturing processes of the ultrasonic device  22 . 
     In order to manufacture the ultrasonic device  22 , as shown in  FIG.  7   , an element substrate forming process S 1 , a sealing plate forming process S 2 , a bonding process S 3 , and a processing process S 4  are executed. 
       FIGS.  8  to  12 C  schematically show sections in the vicinity of the ultrasonic transducer group  45 A shown in  FIG.  4   . 
     Element Substrate Forming Process 
     As shown in the top row of  FIG.  8   , in the element substrate forming process S 1 , first, for example, the vibration film  412 , the piezoelectric elements  413 , the lower electrode connection line  414 , and the upper electrode extraction line  416  (not shown) are formed on the substrate main body  411  made of Si (Step S 11 : element portion forming process). In Step S 11 , a film of Zr is formed on a film of SiO 2  which is formed by performing thermal oxidation treatment on the substrate main body  411 , and thermal oxidation treatment is further performed so as to form a layer of ZrO 2  and thus to form the vibration film  412 . The lower electrode  413 A, the piezoelectric film  413 B, and the upper electrode  413 C are formed on the vibration film  412 , and thus the piezoelectric element  413  is formed. The lower electrode connection line  414  is formed when the lower electrode  413 A is formed, and the upper electrode extraction line  416  is formed when the upper electrode  413 C is formed. Specifically, first, an electrode material formed as a film on the vibration film  412  through, for example, sputtering is patterned, and thus the lower electrode  413 A and the lower electrode connection line  414  are formed. Thereafter, the piezoelectric film  413 B is formed on the lower electrode  413 A. After the piezoelectric film  413 B is formed, similar to the lower electrode  413 A and the lower electrode connection line  414 , the upper electrode  413 C and the upper electrode extraction line  416  are formed. 
     Next, as shown in  FIG.  7   , the wiring portion  415  is formed on the lower electrode connection line  414  (Step S 12 : wiring portion forming process). In Step S 12 , as shown in the middle row of  FIG.  8   , a photosensitive resin layer  51  is formed. In this case, a thickness of the photosensitive resin layer  51  is adjusted such that a thickness dimension (thickness) of the photosensitive resin layer  51  on the lower electrode connection line  414  is equal to a thickness dimension (thickness) of the main body part  415 A of the wiring portion  415 . In the embodiment, the photosensitive resin layer  51  is formed to have a thickness of, for example, 10 μm by using a positive photoresist. The photosensitive resin layer  51  is exposed and developed, as shown in the bottom row of  FIG.  8   , the photosensitive resin layer  51  at the formation position of the main body part  415 A is removed, and a mask pattern having an opening  51 A at the formation position is formed. As shown in the top row of  FIG.  9   , the main body part  415 A is formed by depositing Cu on the lower electrode connection line  414  in the opening  51 A according to an electroplating method, for example, and, as shown in the middle row of  FIG.  9   , the photosensitive resin layer  51  is removed. Thereafter, as shown in the bottom row of  FIG.  9   , the coating part  415 B is formed on a surface of the main body part  415 A according to an electroless plating method, for example. In the embodiment, a Ni layer having a thickness dimension (thickness) of 50 nm and an Au layer having a thickness dimension (thickness) of 100 nm are laminated in this order. 
     Next, as shown in  FIG.  7   , the bonding portions  417  are formed on the element substrate  41  (Step S 13 : bonding portion forming process). In Step S 13 , as shown in the top row of  FIG.  10   , for example, a photosensitive resin layer  52  for forming the bonding portions  417  is formed on the element substrate  41 . In this case, a thickness of the photosensitive resin layer  52  is adjusted such that a thickness dimension (thickness) of the photosensitive resin layer  52  is equal to a thickness dimension (thickness) of the bonding portion  417  at a formation position of the bonding portion  417 . In the embodiment, the bonding portion  417  is formed on the vibration film  412  at the respective formation positions, and thus thickness dimensions (thicknesses) are the same as each other. Thus, a surface of the photosensitive resin layer  52  may be formed to be flat, and a thickness is easily adjusted. The photosensitive resin layer  52  is formed to have a thickness of 22 μm and a width (the width in the Y direction shown in  FIG.  4   ) of 10 μm at the formation position by using, for example, a negative photoresist. The photosensitive resin layer  52  is exposed and developed such that the bonding portions  417  are formed as shown in the bottom row of  FIG.  10   . 
     Sealing Plate Forming Process 
     Next, as shown in  FIG.  7   , the sealing plate forming process S 2  is performed. In Step S 2 , as shown in the first row of  FIG.  11   , first, the sealing plate  42  provided with the first through-electrodes  422  and the second through-electrode  425  (not shown) is formed (Step S 21 : substrate forming process (refer to  FIG.  7   )). 
     Next, as shown in the second and subsequent rows of  FIG.  11   , the first conduction portion  421  and the second conduction portion  424  (not shown) are formed on the inner surface  42 A side of the sealing plate  42  (Step S 22 : conduction portion forming process (refer to  FIG.  7   )). In Step S 22 , first, a resin layer  53  for forming the first resin part  421 A is formed on the inner surface  42 A of the sealing plate  42 . Thereafter, the resin layer  53  formed at positions other than the formation position of the first resin part  421 A is removed through etching. Next, the resin layer  53  is heated and melted, and is then solidified, and thus the substantially hemispherical first resin part  421 A is formed. In the embodiment, the first resin part  421 A is formed to have, for example, a width dimension (that is, the diameter L 1  of the surface on the inner surface  42 A side) of 24 μm and a height dimension (height) of 12 μm. A shape of the first resin part  421 A may be adjusted by using a volume of the resin layer  53  before being melted, the wettability of the inner surface  42 A, or the like. For example, a TiW layer (50 nm) and an Au layer (100 nm) are laminated in this order as the first conductive film  421 B. In Step S 22 , the second conduction portion  424  and the first conduction portion  421  are simultaneously formed. The second conduction portion  424  is formed to have larger width and height than that of the first conduction portion  421 . For example, the second resin part  424 A is formed to have a width dimension (width) of 44 μm and a height dimension (height) of 22 μm. 
     Bonding Process 
     Next, as shown in  FIG.  7   , a bonding process of bonding the element substrate  41  and the sealing plate  42  formed as described above together is performed (Step S 3 ). In Step S 3 , as shown in  FIG.  12   , the sealing plate  42  is disposed on the element substrate  41 . In this case, relative positions between the element substrate  41  and the sealing plate  42  are adjusted. In other words, positioning is performed so that the first conduction portion  421  overlaps the corresponding wiring portion  415 , and the second conduction portion  424  overlaps the electrical connection portion  416 C. As shown in the top row of  FIG.  12   , the height dimension (dimension in the Z direction) of the second conduction portion  424  is substantially equal to a sum of the height dimensions (heights) of the first conduction portion  421  and the wiring portion  415 . 
     After the positioning is performed, at least one of the element substrate  41  and the sealing plate  42  is pressed in a direction in which the element substrate  41  and the sealing plate  42  come close to each other. Consequently, the first conduction portion  421  is elastically deformed so as to come into close contact with the wiring portion  415 . Similarly, the second conduction portion  424  comes into close contact with the electrical connection portion  416 C. In this state, the element substrate  41  and the sealing plate  42  are heated (for example, for an hour at 200° C.). Consequently, the bonding portion  417  is melted and is, then, solidified again, and thus the element substrate  41  and the sealing plate  42  are bonded to each other. 
     Processing Process 
     Next, as shown in  FIG.  7   , a processing process of processing the element substrate  41  and the sealing plate  42  is performed (Step S 4 ). In Step S 4 , as shown in  FIG.  12   , a thickness of the substrate main body  411  of the element substrate  41  is adjusted, and then the openings  411 A are formed. A wiring including the lower electrode wires  423  and the upper electrode wires  426  is formed on the outer surface  42 B of the sealing plate  42 . The wiring on the outer surface  42 B side of the sealing plate  42  may be formed in advance. Thereafter, as shown in  FIG.  4   , the openings  411 A are filled with the acoustic matching layer  43 , and then the protective film  44  is formed. In the above-described way, the ultrasonic device  22  is manufactured. 
     Advantageous Effects of First Embodiment 
     In the embodiment, the end part  415 C of the wiring portion  415  is located further toward the sealing plate  42  side than the end part  413 D of the piezoelectric element  413 . In other words, the connection position between the first conduction portion  421  and the wiring portion  415  is located further toward the sealing plate  42  side than the end part  413 D of the piezoelectric element  413 . In the embodiment, the connection position is located further toward the sealing plate  42  side than the −Z side end part Rz of the vibration range of the ultrasonic transducer  45 . In this configuration, even if a position difference occurs in the first conduction portion  421 , since a position of the first conduction portion  421  is located further toward the sealing plate  42  side than the piezoelectric element  413 , it is possible to suppress interference between the ultrasonic transducer  45  and the first conduction portion  421 . 
     Since interference between the ultrasonic transducer  45  and the first conduction portion  421  due to a position difference can be suppressed, it is possible to appropriately perform wiring connection between the element substrate  41  and the sealing plate  42  even if alignment accuracy is lower than in a case where the wiring portion  415  is not formed. 
     It is possible to adjust a connection position between the wiring portion  415  and the first conduction portion  421  according to a height dimension (height) of the wiring portion  415 . Therefore, it is possible to easily adjust a connection position according to characteristics or the like of the ultrasonic transducer  45 . 
     An aspect ratio of the wiring portion  415  is preferably 0.1 or more and 5 or less, and is about 1 in the embodiment. Here, if the aspect ratio is equal to or less than 5, it is possible to prevent the wiring portion  415  from being inclined or bent due to pressing force from the first conduction portion  421 , and thus it is possible to improve the reliability of electrical connection. If the aspect ratio is equal to or more than 0.1, it is possible to prevent the wiring portion  415  from being deformed toward the +Z side due to pressing force from the first conduction portion  421  and thus the first conduction portion  421  from coming close to the ultrasonic transducer  45 . 
     Here, the first conduction portion  421  is in pressure contact with the wiring portion  415  so as to be elastically deformed. In this case, the first conduction portion  421  is deformed along the end part  415 C, and is thus in close contact therewith. As mentioned above, since the first resin part  421 A is elastically deformed, the first conduction portion  421  and the end part  415 C can be made in close contact with each other, and thus it is possible to improve the reliability of electrical connection between the first conduction portion  421  and the wiring portion  415 . 
     The first conductive film  421 B is thinner than the first resin part  421 A and, thus, does not hinder elastic deformation of the first resin part  421 A. Consequently, it is possible to further improve close contact between the first conduction portion  421  and the end part  415 C. Further, the stress applied to the element substrate  41  during pressure contact can be alleviated, and thus it is possible to prevent strain or damage to the element substrate  41 . 
     The first conduction portion  421  has the curved part  421 C which is curved toward the sealing plate  42  from the first connection region C 1  to the outside along the XY plane. That is, the curved part  421 C is curved to be separated from the piezoelectric element  413  toward +Z side. Consequently, it is possible to suppress interference between the ultrasonic transducer  45  and the first conduction portion  421 . 
     The first conduction portion  421  having the curved part  421 C can be easily formed by forming the first resin part  421 A by heating, melting, and then solidifying the resin layer  53 , and by coating the first resin part  421 A with the first conductive film  421 B. 
     Further, the first resin part  421 A is substantially hemispherical during formation, and the end surface thereof on the inner surface  42 A side is substantially circular. As the diameter L 1  of the end surface, the distance d 1  from the sealing plate  42  to the −Z side end part Rz of the vibration range of the ultrasonic transducer  45  satisfies the above Expression (1). Consequently, the first conduction portion  421  can be disposed outside the vibration range of the ultrasonic transducer  45 , and thus it is possible to further suppress interference between the ultrasonic transducer  45  and the first conduction portion  421 . Therefore, it is possible to appropriately drive the ultrasonic transducer  45 . 
     In the embodiment, the second conduction portion  424  is in contact with the electrical connection portion  416 C having a smaller height dimension (height) than that of the wiring portion  415  that is in contact with the first conduction portion  421 . Consequently, it is possible to perform the wiring connection using the second conduction portion  424  that is larger than the first conduction portion  421  in the wiring region Ar 2 . Therefore, it is possible to increase an area of the second connection region C 2  between the second conduction portion  424  and the electrical connection portion  416 C, and thus it is possible to reduce the contact resistance. 
     In the wiring region Ar 2 , it is easier to increase the width dimension (for example, dimensions in the X direction and the Y direction) of the electrical connection portion  416 C than in the array region Ar 1 . Thus, the second conduction portion  424  is provided at the position of overlapping the wiring region Ar 2  outside the array region Ar 1 , and thus it is easy to increase the size of the second conduction portion  424 . 
     Here, the height dimension (height) of the second conduction portion  424  before the elastic deformation is substantially equal to the sum of the height dimensions (heights) of both of the wiring portion  415  and the first conduction portion  421  before the elastic deformation. In this case, the first conduction portion  421  has substantially the same deformation amount in the Z direction as that of the second conduction portion  424  that is larger than the first conduction portion  421 , and thus an area of the second connection region C 2  can be larger than the area of the first connection region C 1 . In other words, as represented by the following Expression (3), the height dimension (height) of the second conduction portion  424  before the elastic deformation is equal to or larger than the sum of the height dimensions (heights) of both of the wiring portion  415  and the first conduction portion  421 , and thus the area of the second connection region C 2  can be larger than the area of the first connection region C 1 . Therefore, it is possible to reduce resistance in a connection part of the second conduction portion  424 , and thus a higher current can flow. It is possible to reduce the number of second conduction portions  424 , and thus it is possible to simplify the configuration thereof. 
       Expression 2:  L   2 /2≥ L   3   +L   1 /2  (3)
 
     The height dimension (height) of the second conduction portion  424  before the elastic deformation may be smaller than the sum of the height dimensions (heights) of both of the wiring portion  415  and the first conduction portion  421  before the elastic deformation. In this case, the deformation amount of the first conduction portion  421  in the Z direction is larger than that of the second conduction portion  424 , and thus the area of the first connection region C 1  can be substantially the same as the area of the end part  415 C of the wiring portion  415  or the first connection region C 1  can cover the end part  415 C of the wiring portion  415 . In other words, as represented by the following Expression (4), the height dimension (height) of the second conduction portion  424  before the elastic deformation is equal to or smaller than the sum of the height dimensions (heights) of both of the wiring portion  415  and the first conduction portion  421 , and thus the area of the first connection region C 1  can be equal to or larger than the area of the end part  415 C of the wiring portion  415 . Therefore, it is possible to reduce resistance in a connection part of the first conduction portion  421 , and thus a higher current can flow. 
       Expression 3:  L   2 /2&lt; L   3   +L   1 /2  (4)
 
     In the embodiment, the second bonding part  417 B bonds the element substrate  41  to the sealing plate  42  in the array region Ar 1 . In this configuration, for example, the uniformity of a distance between the element substrate  41  and the sealing plate  42  can be improved compared with a configuration in which the element substrate  41  and the sealing plate  42  are bonded to each other by using only the first bonding part  417 A. Consequently, for example, it is possible to prevent defective connection between the first conduction portion  421  and the wiring portion  415  from occurring due to warping or the like of the element substrate  41  in the central part of the array region Ar 1 . Therefore, it is possible to improve the reliability of wiring connection between the element substrate  41  and the sealing plate  42 . 
     Second Embodiment 
     Hereinafter, a second embodiment will be described. 
     In the first embodiment, the first conduction portion  421  has a substantially hemispherical conduction part with the wiring portion  415  and is provided to overlap the wiring portion  415  in plan view in the Z direction. In contrast, the second embodiment is mainly different from the first embodiment in that a wiring portion and a first conduction portion are provided to intersect each other in plan view in the Z direction. 
     In the following description, the same constituent elements as those in the first embodiment are given the same reference numerals, and description thereof will be omitted or will be made briefly. 
     Configuration of Ultrasonic Device 
       FIG.  13    is a sectional view showing a schematic configuration of main portions of an ultrasonic device according to the second embodiment.  FIG.  14    is a sectional view showing a schematic configuration of main portions of the ultrasonic device according to the second embodiment in  FIG.  13   .  FIG.  15    is a perspective view showing a wiring portion and a first conduction portion of the ultrasonic device according to the second embodiment.  FIG.  13    is a sectional view of an ultrasonic device  22  taken along the line B-B in  FIG.  14   . 
     As shown in  FIGS.  13  and  14   , a wiring portion  61  is provided on the element substrate  41  in the ultrasonic device  60  of the second embodiment. A first conduction portion  62  is provided on the sealing plate  42 . The wiring portion  61  and the first conduction portion  62  are in contact with and electrically connected to each other. Consequently, the lower electrode  413 A of the piezoelectric element  413  of the ultrasonic transducer  45  is electrically connected to the circuit substrate  23  via the wiring portion  61 , the first conduction portion  62 , the first through-electrode  422 , the lower electrode wire  423 , and the like. 
     As shown in  FIG.  14   , in the second embodiment, a configuration in which a single first through-electrode  422  is provided for a single first conduction portion  62  is exemplified, but the number or an arrangement position of the first through-electrodes  422  is not limited to the configuration in the second embodiment. 
     Configuration of Wiring Portion 
     The wiring portion  61  includes a main body part  611  and a coating part  612  and has conductivity. The wiring portion  61  is configured in the substantially same manner as the wiring portion  415  of the first embodiment except that the X direction is a longitudinal direction. 
     Above all, the coating part  612  which is formed by using a conductive metal material is configured in the substantially same manner as the coating part  415 B of the first embodiment and is formed to cover a surface of the main body part  611 . 
     The main body part  611  is provided at a position overlapping the wall portion  411 B such that the X direction is a longitudinal direction thereof. In the main body part  611 , for example, a dimension thereof in the X direction is substantially the same as that of the opening  411 A, and a dimension thereof in the Y direction is slightly smaller than that of the wall portion  411 B. More specifically, the main body part  611  has, for example, a dimension of 30 μm in the X direction, a dimension (width dimension) of 10 μm in the Y direction, and a dimension (height dimension) of 10 μm in the Z direction. 
     Similar to the first embodiment, the main body part  611  is formed, for example, on the lower electrode connection line  414  according to an electroplating method by using a conductive metal material. In other words, in the second embodiment, a dimension of the lower electrode connection line  414  in the X direction is substantially the same as that of the opening  411 A. 
     Configuration of First Conduction Portion 
     A longitudinal direction of the first conduction portion  62  is the Y direction, and the first conduction portion  62  is provided on the inner surface  42 A of the sealing plate  42  so as to intersect the wiring portion  61  in plan view in the Z direction (refer to  FIG.  15   ). The first conduction portion  62  includes a first resin part  621  and a first conductive film  622  which covers at least a part of the first resin part  621  and is electrically connected to the first through-electrode  422 . The first conduction portion  62  is in pressure and close contact with the wiring portion  61  provided on the element substrate  41  and is electrically connected to the wiring portion  61 . 
     The first resin part  621  is formed by using an elastic resin material in the same manner as in the first embodiment. In the second embodiment, the first resin part  621  has the Y direction as a longitudinal direction and is formed in a substantially semi-cylindrical shape in which a ZX section before being elastically deformed is substantially semi-circular. The ZX section of the first resin part  621  is not limited to being substantially semi-circular and may be substantially trapezoidal (a state in which corners of a trapezoid are rounded). 
     The first conductive film  622  is provided to stride over the first resin part  621  along the X direction by using the same conductive material as that in the first embodiment. Specifically, the first conductive film  622  is provided at a position overlapping at least the wiring portion  61  on the first resin part  621 . On the first resin part  621 , a dimension of the first conductive film  622  in the Y direction is larger than a dimension of the wiring portion  61 . A +X side end part of the first conductive film  622  extends to a position overlapping the +Z side end part of the first through-electrode  422  and is electrically connected to the first through-electrode  422 . 
     The first conduction portion  62  configured as mentioned above is in pressure contact with the −Z side end part of the wiring portion  61 . In this case, the first conduction portion  62  is in close contact with the wiring portion  61  by elastic force. As mentioned above, the wiring portion  61  and the first conduction portion  62  can be made in close contact with each other by the elastic force of the first conduction portion  62 , and thus it is possible to improve the connection reliability between the wiring portion  61  and the first conduction portion  62 . As shown in  FIG.  13   , the end part of the first conduction portion  62  on the +Z side is located further toward the sealing plate  42  side than the −Z side end part Rz of the vibration range of the ultrasonic transducer  45 . Thus, interference between the first conduction portion  62  and the ultrasonic transducer  45  is suppressed. Similar to the first embodiment, the first conductive film  622  is sufficiently thinner than the first resin part  621  in thickness. Consequently, the first conductive film  622  can be deformed according to elastic deformation of the first resin part  621 . 
     Advantageous Effects of Second Embodiment 
     The wiring portion  61  and the first conduction portion  62  intersect each other in plan view in the Z direction. Consequently, in the ultrasonic device  60 , a position difference between the element substrate  41  and the sealing plate  42  is allowable during wiring connection, and thus it is possible to prevent defective connection from occurring. In other words, in the plan view, in a case where the wiring portion  61  and the first conduction portion  62  do not intersect each other (for example, a case where the wiring portion  61  and the first conduction portion  62  are parallel to each other or a connection surface between the wiring portion  61  and the first conduction portion  62  is substantially rectangular or substantially circular), an area of a connection part may be reduced due to a position difference between the element substrate  41  and the sealing plate  42 , so that contact resistance increases. Appropriate electrical connection may not be performed due to a position difference. In contrast, since the wiring portion  61  and the first conduction portion  62  are disposed to intersect each other, an allowable amount for a position difference in the X direction and the Y direction during alignment can be increased (refer to  FIG.  15   ). Thus, alignment between the element substrate  41  and the sealing plate  42  can be easily performed, and wiring connection can also be easily performed. It is possible to improve connection reliability. 
     The wiring portion  61  has the X direction (second direction) as a longitudinal direction, and the first conduction portion  62  has the Y direction as a longitudinal direction. In the Y direction (third direction), a dimension of the first conductive film  622  of the first conduction portion  62  is larger than a dimension of the wiring portion  61 . Consequently, even if a position difference between the element substrate  41  and the sealing plate  42  occurs in the Y direction during wiring connection, it is possible to maintain connection reliability on the basis of elastic force while allowing the position difference. 
     Modification Example 
     The present invention is not limited to the above-described embodiments, and configurations obtained through modifications, alterations, and combinations of the respective embodiments as appropriate within the scope capable of achieving the object of the present invention are included in the present invention. 
     For example, in the first embodiment, as an example, a description has been made of a configuration in which wiring connection between the element substrate  41  and the sealing plate  42  is performed by using the wiring portion  415  provided on the element substrate  41  and the first conduction portion  421  provided on the sealing plate  42 . However, the present invention is not limited to the configuration of each embodiment and may employ a configuration in each modification example which will be described below. A modification example of the first embodiment will be exemplified as each modification example which will be described below, and the same modification may also be applied to the second embodiment. 
     First Modification Example 
       FIG.  16    is a sectional view showing a schematic configuration of the ultrasonic device  22  according to a first modification example. 
     As shown in  FIG.  16   , in the first modification example, a wiring portion  47  which is configured in the same manner as the first conduction portion  421  of the first embodiment is provided on the element substrate  41 . A first conduction portion  48  which is configured in the same manner as the wiring portion  415  of the first embodiment is provided on the sealing plate  42 . The wiring portion  47  and the first conduction portion  48  are in contact with and electrically connected to each other. 
     The wiring portion  47  includes a resin part  471 , and a conductive film  472  which covers the resin part  471 . The resin part  471  is configured in the same manner as the first resin part  421 A and is formed on the rear surface  41 A of the element substrate  41 . The conductive film  472  is configured in the same manner as the first conductive film  421 B and is conductively connected to the lower electrode  413 A of each ultrasonic transducer  45  forming the ultrasonic transducer group  45 A. 
     The first conduction portion  48  includes a connection line  481  extracted from the first through-electrode  422 , a main body part  482  provided on the connection line  481 , and a coating part  483  coating the main body part  482 . The connection line  481  which is configured in the same manner as the lower electrode connection line  414  connects the first through-electrode  422  to the first conduction portion  48  and is a base layer of the main body part  482  in the modification example. The main body part  482  and the coating part  483  are configured in the same manner as the main body part  415 A and the coating part  415 B described above, respectively. 
     Also in the first modification example, a height dimension (height) of the wiring portion  47  is larger than a height dimension (height) of the piezoelectric element  413 . Consequently, similar to the first embodiment, it is possible to suppress interference between the wiring portion  47  and the ultrasonic transducer  45 , and thus it is possible to easily perform wiring connection. An end part of the wiring portion  47  on the −Z side is preferably located further toward the sealing plate  42  side than the −Z side end of the drive range of the ultrasonic transducer  45 . 
     Since the wiring portion  47  is elastically deformed, close contact with the first conduction portion  48  can be improved, and the stress applied to the element substrate  41  and the sealing plate  42  during connection can be alleviated. 
     Second Modification Example 
       FIG.  17    is a sectional view showing a schematic configuration of the ultrasonic device  22  according to a second modification example. 
     As shown in  FIG.  17   , in the second modification example, the wiring portion  47  of the first modification example is provided on the element substrate  41 , and the wiring portion  47  and the first conduction portion  421  provided on the sealing plate  42  are in contact with and electrically connected to each other. 
     Also in this configuration, similar to the first embodiment, it is possible to suppress interference between the wiring portion  47  and the ultrasonic transducer  45 , and thus it is possible to easily perform wiring connection. Since the wiring portion  47  and the first conduction portion  421  are elastically deformed, close contact between the wiring portion  47  and the first conduction portion  48  can be improved, and the stress applied to the element substrate  41  and the sealing plate  42  during connection can be alleviated. 
     Since both of the wiring portion  47  and the first conduction portion  421  are elastically deformed, it is possible to further improve close contact between the wiring portion  47  and the first conduction portion  48 . 
     Third Modification Example 
       FIG.  18    is a sectional view showing a schematic configuration of the ultrasonic device  22  according to a third modification example. 
     As shown in  FIG.  18   , in the third modification example, the first conduction portion  48  of the first modification example is provided on the sealing plate  42 , and the first conduction portion  48  and the wiring portion  415  provided on the element substrate  41  are in contact with and electrically connected to each other. 
     In this configuration, similar to the first embodiment, it is possible to suppress interference between the first conduction portion  48  and the ultrasonic transducer  45 , and thus it is possible to easily perform wiring connection. 
     It is possible to adjust a distance between the element substrate  41  and the sealing plate  42  according to height dimensions (heights) of the wiring portion  415  and the first conduction portion  48 . Further, surfaces of the wiring portion  415  and the first conduction portion  48  are bonded to each other through diffusion bonding as described above, so that the element substrate  41  and the sealing plate  42  can be bonded to each other at a plurality of positions in the array region Ar 1 , and thus it is possible to improve the in-plane uniformity of a distance between the element substrate  41  and the sealing plate  42 . 
     Fourth Modification Example 
       FIG.  19    is a sectional view showing a schematic configuration of the ultrasonic device  22  according to a fourth modification example. 
     As shown in  FIG.  19   , in the fourth modification example, the main body part  415 A of the first embodiment as a wiring portion is provided on the element substrate  41 , and the main body part  415 A and the first conduction portion  421  provided on the sealing plate  42  are in contact with and electrically connected to each other. 
     In this configuration, similar to the first embodiment, it is possible to suppress interference between the first conduction portion  421  and the ultrasonic transducer  45 , and thus it is possible to easily perform wiring connection. The coating part  415 B is not formed, and thus a manufacturing process can be simplified. 
     Even in a case where bonding cannot be performed through diffusion bonding between the main body part  415 A and the first conduction portion  421 , the second bonding parts  417 B are disposed with a bonding position interposed therebetween, and thus it is possible to improve the reliability of wiring connection. 
     Fifth Modification Example 
       FIGS.  20  and  21    are sectional views showing schematic configurations of the ultrasonic device  22  according to a fifth modification example. 
     As shown in  FIG.  20   , in the fifth modification example, the element substrate  41  is provided with a wiring portion  49  instead of the wiring portion  415  of the first embodiment, and the wiring portion  49  and the first conduction portion  421  provided on the sealing plate  42  are in contact with and electrically connected to each other. Also in this configuration, similar to the first embodiment, it is possible to suppress interference between the first conduction portion  421  and the ultrasonic transducer  45 , and thus it is possible to easily perform wiring connection. 
     A first projecting portion  418  projecting toward the sealing plate  42  side is provided at a position that is opposite to the first conduction portion  421  on the substrate main body  411 . The lower electrode connection line  414  is provided to stride over the first projecting portion  418 . The wiring portion  49  is formed of the first projecting portion  418  and a part of the lower electrode connection line  414 . For example, the first projecting portion  418  is made of the same material as that of the substrate main body  411  and is bonded onto the vibration film  412 . In the modification example, the lower electrode connection line  414  may be formed by laminating a TiW layer (50 nm) and an Au layer (100 nm) in this order. As mentioned above, the Au layer is formed on the surface of the wiring portion  49 , and thus the first conduction portion  421  having an Au layer on the surface thereof and the wiring portion  49  can be bonded to each other through diffusion bonding. 
     A second projecting portion  419  is provided at a formation position of the bonding portion  417  on the substrate main body  411 . The second projecting portion  419  is formed in the same manner as the first projecting portion  418  and projects toward the sealing plate  42  side. The bonding portion  417  is formed on a surface of the second projecting portion  419  on the sealing plate  42  side. 
     There may be a configuration in which the first conduction portion  48  of the first modification example is provided instead of the first conduction portion  421 . The second projecting portion  419  is formed, and thus a bonding height between the substrate main body  411  and the sealing plate  42  can be easily determined. 
     As shown in  FIG.  21   , the first projecting portion  418  and the second projecting portion  419  may be formed by adjusting an etching amount, for example, when the rear surface  41 A side of the substrate main body  411  is formed through etching. In this case, for example, the rear surface  41 A side of the substrate main body  411  is etched such that the first projecting portion  418  and the second projecting portion  419  are formed, and then the vibration film  412  is formed. Next, the operation surface  41 B side of the substrate main body  411  is etched, and thus the opening  411 A is formed. 
     In the fifth modification example, the first projecting portion  418  and the second projecting portion  419  are formed by etching the substrate main body  411 , but, for example, the second projecting portion  419  may be formed on the sealing plate  42 . The second projecting portion  419  is formed according to the same method as that of the first projecting portion  418  and projects toward the substrate main body  411  side. The bonding portion  417  is formed on a surface of the second projecting portion  419  on the substrate main body side. The second projecting portion  419  is formed as mentioned above, and thus the substrate main body  411  can be more easily formed than in a case where the first projecting portion  418  and the second projecting portion  419  are formed on the substrate main body  411 . As described above, a bonding height between the substrate main body  411  and the sealing plate  42  can be easily determined. 
     Other Modification Examples 
       FIGS.  22  to  26    are sectional views showing schematic configurations of ultrasonic devices  22  according to other modification examples. 
     In the above-described respective embodiments and modification examples, the second bonding parts  417 B are disposed with each wiring portion interposed therebetween in one direction in the array region Ar 1 , but this is only an example. 
       FIG.  22    shows a modification example of the first embodiment, and  FIGS.  23  to  26    show respective modification examples of the first to fourth modification examples. As shown in  FIGS.  22  to  26   , for example, the second bonding part  417 B may not be provided in the array region Ar 1 . In this case, the element substrate  41  and the sealing plate  42  are bonded to each other via the first bonding part  417 A. Even in this configuration, the element substrate  41  and the sealing plate  42  have the sufficient rigidity, and thus it is possible to secure the connection reliability between the wiring portion and the first conduction portion. In a case where it is possible to perform diffusion bonding between the wiring portion and the first conduction portion, it is possible to improve connection reliability, and it is also possible to simplify a configuration due to the second bonding part  417 B not being provided. 
     A pair of the second bonding parts  417 B may be disposed for some of the wiring portions disposed in the array region Ar 1 . Not only a configuration in which two second bonding parts  417 B are disposed with the wiring portion interposed therebetween but also a configuration in which a single second bonding part  417 B is disposed may be employed. For example, the second bonding part  417 B may be disposed on the +Y side or the −Y side of each wiring portion. 
     In the above-described respective embodiments, the first conduction portion and the second conduction portion have a configuration in which the resin part is coated with the conductive film thinner than the resin part, but any other configuration may be used. For example, there may be a configuration in which a conductive layer having the substantially same thickness as that of the resin part is laminated on the resin part, and the conductive layer may be thicker than the resin part. If the resin part is thicker than the conductive layer, it is possible to further alleviate the stress applied to the element substrate  41  or the sealing plate  42  due to elasticity of the first conduction portion and the second conduction portion. 
     In the first embodiment, the first conduction portion  421  includes the curved part  421 C, but is not limited thereto, and may include an inclined part which is inclined in a direction of becoming distant from the piezoelectric element  413  toward the element substrate  41  from the sealing plate  42 . This inclined part may have a planar or curved inclined surface and may have an inclined surface including a planar surface and a curved surface. 
     In the above-described respective embodiments, the ultrasonic transducer group  45 A formed of two ultrasonic transducers  45  is used as a single transmission/reception channel, but the ultrasonic transducer group  45 A may be formed by connecting the lower electrodes  413 A of three or more ultrasonic transducers  45  to each other. There may be a configuration in which the lower electrodes  413 A of the respective ultrasonic transducers  45  are separate from each other, and thus each of the ultrasonic transducers  45  is individually driven. In this case, each ultrasonic transducer  45  may function as a single transmission/reception channel. 
     In the above-described respective embodiments, a description has been made of an example of the ultrasonic device  22  having a two-dimensional array structure in which the ultrasonic transducer groups  45 A each functioning as a single transmission/reception channel are disposed in a matrix in the array region Ar 1  of the element substrate  41 , but this is only an example. For example, the ultrasonic device may have a one-dimensional array structure in which a plurality of transmission/reception channels are disposed along one direction. For example, the ultrasonic transducer group  45 A may be formed of a plurality of ultrasonic transducers  45  disposed along the X direction, and a plurality of ultrasonic transducer groups  45 A are disposed in the Y direction so as to form the ultrasonic array AL having a one-dimensional array structure. 
     In the above-described embodiments, a description has been made of an example of a configuration in which the ultrasonic transducer  45  is formed of the vibration film  412  and the piezoelectric element  413  formed on the vibration film  412 , but this is only an example. For example, the ultrasonic transducer  45  may be configured to include a flexible film, a first electrode provided on the flexible film, and a second electrode provided at a position opposing the first electrode in a sealing plate. The first electrode and the second electrode form an electrostatic actuator as a vibrator. In this configuration, an ultrasonic wave can be transmitted by driving the electrostatic actuator, and an ultrasonic wave can be detected by detecting electrostatic capacitance between the electrodes. 
     In the above-described respective embodiments, an ultrasonic apparatus which measures an organ of a living body has been described as an example of an electronic apparatus, but the invention is not limited thereto. For example, the configurations of the above-described respective embodiments and modification examples may be applied to a measurement apparatus which measures various structural bodies, detects a defect of the structural body, or inspects aging thereof. The same is true of a measurement apparatus which measures, for example, a semiconductor package or a wafer and detects a defect of such a measurement target. 
     In the above-described embodiments, a description has been made of an example of a configuration in which the ultrasonic transducer is provided on the element substrate, but the invention is not limited thereto. For example, the configurations of the respective embodiments and modification examples may be applied to amounting structure including a first substrate provided with an electric component such as a semiconductor IC, that is, an functional element, and a second substrate electrically connected to the first substrate, or an image display device or an image forming device in which the mounting structure is provided in a case. In other words, a wiring portion which is provided on the first substrate and is connected to the electronic component and a conduction portion which is provided on the second substrate and is connected to the wiring portion are connected to each other further toward the second substrate side than the electronic component, and thus it is possible to suppress interference between the functional element and the conduction portion and thus to appropriately and easily perform wiring connection between the first substrate and the second substrate. 
     A specific structure of when the present invention is implemented may be configured as appropriate by combining the respective embodiments and modification examples within the scope of being capable of achieving the object of the present invention, and may be changed to other structures as appropriate.