Patent Publication Number: US-2020298350-A1

Title: Electronic device manufacturing method, electronic device, electronic apparatus, and vehicle

Description:
The present application is based on, and claims priority from JP Application Serial Number 2019-054301, filed Mar. 22, 2019, the disclosure of which is hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to an electronic device manufacturing method, an electronic device, an electronic apparatus, and a vehicle. 
     2. Related Art 
     In an electronic device such as a quartz crystal vibrator or a gyro sensor, an electronic component such as a vibrator element is generally contained in a package. The package includes a base on which the electronic component is mounted and a lid bonded to the base, and a space for containing the electronic component is formed therebetween. For example, seam welding is used for bonding the base and the lid, as disclosed in JP-A-8-274208. In JP-A-8-274208, an annular seal frame is previously soldered to a ceramic package, and the seal frame and a metal lid are seam-welded. In the seam welding, a roller electrode comes into pressure contact with an edge of the metal lid. 
     In a welding method described in JP-A-8-274208, since a contact position of the metal lid with the roller electrode is the outermost position of the metal lid, a difference between a length of a path of a current flowing from the contact position toward an inner peripheral edge of a portion to be welded and a length of a path of a current flowing toward an outer peripheral edge of the portion is large. Accordingly, in the welding method of JP-A-8-274208, a variation of the current in the portion to be welded increases, and as a result, there is a problem that welding unevenness occurs. Here, when there is too little current contributing to the welding, melting is insufficient, and meanwhile, when too much current contributes to the welding, a void is generated. In either case, there is a possibility that airtightness of bonding is reduced. 
     SUMMARY 
     An electronic device manufacturing method according to an aspect of the present disclosure includes mounting an electronic component on a base, placing a lid on the base, and bringing a roller electrode to come into contact with the lid at a contact position overlapping a region where the base and the lid are welded inside an outer edge of the lid in a plan view, and bonding the lid to the base by seam welding. 
     An electronic device according to an aspect of the present disclosure includes an electronic component, a base on which the electronic component is mounted, and a lid welded to the base in a state in which the electronic component is contained between the base and the lid, wherein a surface of the lid opposite to the base forms a shape such that a distance from the base is the maximum inside an outer edge of the lid in a portion overlapping a region where the base and the lid are welded in a plan view. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a plan view illustrating an electronic device according to a first embodiment. 
         FIG. 2  is a cross-sectional view taken along line II-II in  FIG. 1 . 
         FIG. 3  is a cross-sectional view illustrating a shape of a lid according to the first embodiment. 
         FIG. 4  is a diagram illustrating a flow of an electronic device manufacturing method. 
         FIG. 5  is a cross-sectional view illustrating a state before pressing when the lid is manufactured by the processing. 
         FIG. 6  is a cross-sectional view illustrating a state when performing the processing when the lid is manufactured by the processing. 
         FIG. 7  is a cross-sectional view illustrating an arrangement state of each member during a component mounting step. 
         FIG. 8  is a plan view illustrating a positional relationship between a base and the lid during a lid placing step. 
         FIG. 9  is a cross-sectional view illustrating an outline of seam welding during a bonding step. 
         FIG. 10  is a view illustrating a state of a current flowing from the lid toward the base during the seam welding in the first embodiment. 
         FIG. 11  is a view illustrating a state of a current flowing from the lid toward the base during seam welding of related art. 
         FIG. 12  is a cross-sectional view illustrating a shape of a lid according to a second embodiment. 
         FIG. 13  is a cross-sectional view illustrating a shape of a lid according to a third embodiment. 
         FIG. 14  is a cross-sectional view illustrating a shape of a lid according to a fourth embodiment. 
         FIG. 15  is a perspective view schematically illustrating a configuration of a mobile type or notebook type personal computer that is an example of an electronic apparatus. 
         FIG. 16  is a plan view schematically illustrating a configuration of a smartphone that is an example of the electronic apparatus. 
         FIG. 17  is a perspective view schematically illustrating a configuration of a digital still camera which is an example of the electronic apparatus. 
         FIG. 18  is a perspective view schematically illustrating an automobile which is an example of a vehicle. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, preferred embodiments of the present disclosure will be described with reference to the accompanying drawings. In the drawings, dimensions or scales of the respective portions are different from actual dimensions or scales as appropriate, and some portions are schematically illustrated for easy understanding. Further, the scope of the present disclosure is not limited to the embodiments unless stated otherwise to limit the present disclosure in particular. 
     A. Electronic Device 
     A 1 . First Embodiment 
     A 1 - 1 . Outline of Electronic Device 
       FIG. 1  is a plan view illustrating an electronic device  1  according to a first embodiment.  FIG. 2  is a cross-sectional view taken along line II-II in  FIG. 1 . Hereinafter, for the sake of convenient description, an X axis, a Y axis, and a Z axis that are orthogonal to each other will be used as appropriate. In the following respective figures, arrows representing the axes are appropriately illustrated. A side indicated by the arrow is a +side, and an opposite side thereof is a −side. Further, one or both of a +X direction and a −X direction are simply referred to as an “X direction”, and one or both of a +Y direction and a −Y direction are simply referred to as a “Y direction”, and one or both of a +Z direction and a −Z direction are simply referred to as a “Z direction”. Here, the Z direction is a thickness direction of a plate-shaped lid  42  described below. Viewing from the −Z direction or the +Z direction is called a “plan view”. 
     The electronic device  1  illustrated in  FIGS. 1 and 2  is a vibration type gyro sensor that detects the angular velocity co around the Z axis. The electronic device  1  includes the vibrator elements  10 , a support member  20 , a circuit element  30 , and a package  40 . Each of the vibrator elements  10 , the support member  20 , and the circuit element  30  is an example of an electronic component and is contained in the package  40 . Here, the vibrator element  10  is supported by the package  40  via the support member  20 . Hereinafter, each unit of the electronic device  1  will be briefly described in sequence. 
     The vibrator element  10  illustrated in  FIGS. 1 and 2  is a sensor element made of a piezoelectric material. An example of the piezoelectric material includes a piezoelectric material such as quartz crystal, lithium tantalate, or lithium niobate. Among these, it is preferable to use the quartz crystal as a configuration material of the vibrator element  10 . In this case, frequency-temperature characteristics of the vibrator element  10  can be improved as compared with a case where other piezoelectric materials are used. Hereinafter, a case where the vibrator element  10  is made of the quartz crystal will be described. The X-axis, the Y-axis, and the Z-axis illustrated in the respective figures correspond to an electric axis, a mechanical axis, and an optical axis, respectively, which are crystal axes of quartz crystal configuring the vibrator element  10 . In  FIGS. 1 and 2 , illustration of an electrode provided on a surface of the vibrator element  10  is omitted. 
     The vibrator element  10  has a so-called double T-type structure. Specifically, the vibrator element  10  includes a base portion  11 , a first detection arm  12   a  and a second detection arm  12   b  extending from the base portion  11  in the +Y direction and the -Y direction, a first connection arm  13   a  and a second connection arm  13   b  extending from the base portion  11  in the +X direction and the −X direction, a first drive arm  14   a  and a first drive arm  14   b  extending from the first connection arm  13   a  in the +Y direction and the −Y direction, and a second drive arm  15   a  and a second drive arm  15   b  extending from the second connection arm  13   b  in the +Y direction and the −Y direction. A shape of each unit of the vibrator element  10  is not limited to the shape illustrated in  FIG. 1 . For example, each arm of the vibrator element  10  may be appropriately provided with a groove or a hole that opens in the Z direction along a direction in which the arm extends. Further, a width of each arm may be constant. 
     Although not illustrated, the first drive arm  14   a,  the first drive arm  14   b,  the second drive arm  15   a,  and the second drive arm  15   b  are provided with a pair of drive electrodes that make the respective drive arms perform flexural vibration in the X direction. Further, although not illustrated, the first detection arm  12   a  and the second detection arm  12   b  are provided with a pair of detection electrodes for detecting charges generated by flexural vibration in the X direction of each of the detection arms. Further, the base portion  11  is provided with a plurality of terminals that are electrically connected to the pair of drive electrodes and the pair of detection electrodes. Configuration materials of the above-described drive electrode, detection electrode, and terminal are not limited in particular, and an example thereof includes a metal material such as gold (Au) , chromium (Cr) , or titanium (Ti). 
     Hereinafter, detection of the angular velocity ω will be briefly described by using the vibrator element  10 , and first, an alternating voltage is applied between a pair of drive electrodes (not illustrated) as a drive signal. Then, the first drive arm  14   a  and the second drive arm  15   a  perform the flexural vibration in opposite side in the X direction and are in the same phase with the first drive arm  14   a  and the second drive arm  15   a,  and the first drive arm  14   b  and the second drive arm  15   b  perform the flexural vibration in opposite sides in the X direction. At this time, when no angular velocity is applied to the vibrator element  10 , the first drive arms  14   a  and  14   b  and the second drive arms  15   a  and  15   b  vibrate symmetrically with respect to a YZ plane passing through the center of gravity G of the vibrator element  10 , and thereby, the base portion  11 , the first connection arm  13   a,  the second connection arm  13   b,  the first detection arm  12   a,  and the second detection arm  12   b  hardly vibrate. 
     When the angular velocity co around the Z axis is applied to the vibrator element  10  in a state where the first drive arms  14   a  and  14   b  and the second drive arms  15   a  and  15   b  perform the flexural vibration as described above, a Coriolis force in the Y direction is applied to each of the drive arms. The first connection arm  13   a  and the second connection arm  13   b  perform the flexural vibration in opposite side in the Y direction due to the Coriolis force. According to this, the flexural vibrations of the first detection arm  12   a  and the second detection arm  12   b  in the X direction are excited as detection vibrations so as to cancel the flexural vibration. Electric charges generated between the pair of detection electrodes by the detection vibration are output as a detection signal. The angular velocity co is obtained based on the detection signal. As described above, the angular velocity co can be detected. 
     The support member  20  illustrated in  FIGS. 1 and 2  is a substrate for mounting tape automated bonding (TAB). The support member  20  includes a film  21  and a plurality of wires  22 . The film  21  is an insulating material made of a resin material such as polyimide. A device hole  21   a  is formed at the center of the film  21 . The plurality of wires  22  are provided corresponding to a pair of drive electrodes and a pair of detection electrodes (not illustrated) in the vibrator element  10  described above. The plurality of wires  22  are bent and extended from one surface of the film  21  to the other surface side of the film  21  through the device hole  21   a.  Each of the plurality of wires  22  is connected to the base portion  11  of the above-described vibrator element  10  through a metal bump  72 . With this connection, the plurality of wires  22  support the vibrator element  10  in a state of being electrically connected to the pair of drive electrodes and the pair of detection electrodes (not illustrated) in the vibrator element  10 . 
     The circuit element  30  illustrated in  FIGS. 1 and 2  is an integrated circuit including a drive circuit that drives the vibrator element  10  and a detection circuit that detects electric charges output from the vibrator element  10 . Although not illustrated, the circuit element  30  is provided with a plurality of terminals that output a drive signal for driving the above-described vibrator element  10 , and a plurality of terminals that receive a detection signal from the vibrator element  10 . 
     The package  40  illustrated in  FIGS. 1 and 2 , is a container that contains the vibrator element  10 , the support member  20 , and the circuit element  30 . The package  40  includes a base  41 , the lid  42 , and a bonding member  43 . The base  41  and the lid  42  are bonded to each other via the bonding member  43 . As illustrated in  FIG. 2 , a space S that contains the vibrator element  10 , the support member  20 , and the circuit element  30  is formed between the base  41  and the lid  42 . The space S is, for example, in a reduced pressure state of  10  Pa or less. The space S may be filled with an inert gas such as argon or nitrogen. 
     The base  41  is a box-shaped member having a concave portion  411 . An outer shape of the base  41  in a plan view is substantially rectangular. Although not limited in particular, various ceramics such as aluminum oxide are used as a configuration material of the base  41 . In the example illustrated in  FIG. 2 , the base  41  has a flat substrate  41   a,  three frame-shaped substrates  41   b,    41   c,  and  41   d,  which are sequentially stacked in the +Z direction. Although not illustrated, wires made of metal or the like are appropriately provided between the plurality of substrates configuring the base  41 . The number of substrates configuring the base  41  is not limited to the example illustrated in  FIG. 2  and is random. Further, a shape of the base  41  may be a shape that allows seam welding described below, is not limited to the shape illustrated in  FIG. 2 , and is random. 
     A concave portion  411  includes a bottom surface  411   a  configured by a surface on the +Z direction side of the substrate  41   a,  a stepped surface  411   b  configured by a surface on the +Z direction side of the substrate  41   b,  and a stepped surface  411   c  configured by a surface on the +Z direction side of the substrate  41   c.    
     The circuit element  30  is fixed to the bottom surface  411   a  via a fixing member  51  in a state of being fitted inside the substrate  41   b.  The fixing member  51  is an adhesive formed to include, for example, an epoxy resin or an acrylic resin. A plurality of internal terminals  61  are provided on the stepped surface  411   b.  The plurality of internal terminals  61  are electrically connected to a plurality of terminals (not illustrated) of the circuit element  30  via a plurality of wires  71 . Each of the plurality of wires  71  is configured by, for example, a bonding wire. A plurality of internal terminals  62  are provided on the stepped surface  411   c.  The plurality of internal terminals  62  are provided corresponding to the plurality of wires  22  of the support member  20  described above. 
     The plurality of wires  22  of the support member  20  are fixed to the plurality of internal terminals  62  via a plurality of conductive fixing members  52 . By the fixing, the plurality of internal terminals  62  are electrically connected to a plurality of a pair of drive electrodes and a pair of detection electrodes (not illustrated) in the vibrator element  10  described above. Each of the plurality of fixing members  52  is made of, for example, solder, silver paste, a conductive adhesive, or the like. 
     Although not illustrated, the plurality of internal terminals  61  and the plurality of internal terminals  62  are appropriately connected to a plurality of wires provided inside the base  41 . Specifically, the plurality of wires include a plurality of wires that connect some of the plurality of internal terminals  61  to the plurality of internal terminals  62 , and a plurality of wires that connect the remaining terminals of the plurality of internal terminals  61  to a plurality of external terminals  63  on an outer surface of the base  41 . The plurality of external terminals  63  are used when the electronic device  1  is mounted on an external apparatus (not illustrated). The internal terminals  61  and  62  and the external terminals  63  are respectively formed by metal films obtained by plating a metallized layer of, for example, tungsten (W) or the like with a film of nickel (Ni), gold (Au), or the like on. 
     The lid  42  is a plate-shaped member that has a substantially rectangular outer shape in a plan view and closes an opening of the concave portion  411  of the base  41  described above. A material of the lid  42  may be a material that can be seam-welded to the base  41  or the bonding member  43 , and includes metals such as Kovar,  42  alloy, and stainless steel. Further, a surface on the base  41  side in the lid  42  is appropriately plated with a film of, for example, nickel (Ni) or the like. A groove  421  is provided in the surface on the base  41  side of the lid  42  illustrated in  FIGS. 1 and 2 . The groove  421  allows the inside and the outside of the space S to communicate when the electronic device  1  is manufactured and is used as an exhaust hole when the space S is depressurized. The groove  421  is closed by a sealing portion  80  formed by solidifying one or both of the lid  42  and the bonding member  43  after being melted by energy rays. A shape of the lid  42  will be described in detail below. 
     The bonding member  43  is a frame-like member that is interposed between the base  41  and the lid  42  and bonds the base  41  to the lid  42 . The bonding member  43  is also referred to as a seal ring in general. The bonding member  43  is made of, for example, a metal such as Kovar,  42  alloy, or stainless steel. Further, a surface of the bonding member  43  is appropriately plated with, for example, a film of nickel (Ni), gold (Au) or the like. The above-described bonding member  43  is airtightly bonded to the base  41  by soldering using a silver solder or the like. Further, the bonding member  43  is airtightly bonded to the lid  42  by seam welding. By the bonding, the base  41  and the lid  42  are bonded together via the bonding member  43 . Instead of the bonding member  43 , a metal film formed by plating a metallized layer of tungsten (W) or the like with a film of nickel (Ni) , gold (Au) , or the like may be provided on the base  41 . 
     The above is a brief description of each unit of the electronic device  1 . In the electronic device  1  described above, although the base  41  and the lid  42  are bonded by seam welding, a stepped surface  44  is provided on a surface opposite to the base  41  in the lid  42  so as to reduce welding unevenness in the seam welding. Hereinafter, a shape of the lid  42  will be described in detail. Since the actual lid  42  is slightly deformed due to pressurization and melting by the seam welding, the shape is slightly different before and after the seam welding. Hereinafter, description will be made by assuming that the shape of the lid  42  is the same before and after the seam welding. However, actually, it can be said that the shape of the lid  42  is substantially the same before and after the seam welding, except that a slight mark due to contact with a roller electrode  201  described below is formed by the seam welding. 
     A 1 - 2 . Shape of Lid 
       FIG. 3  is a cross-sectional view illustrating the shape of the lid  42  according to the first embodiment. As illustrated in  FIG. 3 , the lid  42  is bonded to the base  41  in a region R. The lid  42  includes a first portion  45  and a second portion  46  thinner than the first portion  45  in a portion overlapping the region R in a plan view. The first portion  45  has a constant thickness T 1 . The second portion  46  includes an outer edge E 0  of the lid  42  and is a portion between the outer edge E 0  and the first portion  45 . The second portion  46  has a constant thickness T 2  smaller than the thickness T 1 . 
     A stepped surface  44  due to a difference between the thicknesses T 1  and T 2  is provided on a surface of the lid  42  opposite to the base  41  in the first portion  45  and the second portion  46 . That is, the surface of the lid  42  opposite to the base  41  has the stepped surface  44  of a stepped shape that approaches the base  41  toward the outer edge E 0  of the lid  42  in a portion overlapping the region R in a plan view. As described above, the surface of the lid  42  opposite to the base  41  has a shape in which a distance from the base  41  is maximum inside the lid  42  more than at the outer edge E 0  of the lid  42  in a portion overlapping the region R where the base  41  and the lid  42  are welded in a plan view. The maximum distance in the present embodiment is equal to the thickness T 1 . 
     The region R is a region where the base  41  and the lid  42  are welded. Further, the region R is a region where the lid  42  and the bonding member  43  overlap in a plan view and can also be said to be a region where the base  41  and the lid  42  are to be welded before welding. In the present embodiment, the outer edge E 0  overlaps the region R in a plan view. The outer edge E 0  may not overlap the region R in a plan view. 
     In the present embodiment, the stepped surface  44  is provided over an entire circumference of the lid  42 . However, the stepped surface  44  may not be provided over the entire circumference of the lid  42 , and may be missed, for example, at a portion corresponding to the above-described groove  421 . 
     A dimension of each part of the first portion  45  and the second portion  46  is designed suitably such that the roller electrode  201  used for the seam welding described below may contact a corner of the stepped surface  44  in a contact position PC without being in contact with the outer edge E 0 . Here, the thickness T 1  of the first portion  45  is not limited in particular and is in a range, for example, more than or equal to 50 μm and less than or equal to 200 μm. The thickness T 2  of the second portion  46  is not limited in particular and is in a range, for example, more than or equal to 40 μm and less than or equal to 150 μm. A difference D between the thickness T 1  and the thickness T 2  is not limited in particular and is in a range, for example, more than or equal to 10 μm and less than or equal to 50 μm. A width W 1  of the first portion  45  and a width W 2  of the second portion  46  are not limited in particular and are in a range, for example, more than or equal to 30 μm and less than or equal to 150 μm. 
     The electronic device  1  described above includes the vibrator element  10  that is an electronic component, the support member  20 , and the circuit element  30 , the base  41  on which the vibrator element  10 , the support member  20 , and the circuit element  30  are mounted, and the lid  42  that is welded to the base  41  in a state of containing the vibrator element piece  10 , the support member  20 , and the circuit element  30 . Further, a surface of the lid  42  opposite to the base  41  has a shape in which a distance from the base  41  is maximum inside the lid  42  more than at the outer edge E 0  in a portion overlapping the region R where the base  41  and the lid are welded in a plan view. Accordingly, it is possible to reduce welding unevenness between the base  41  and the lid  42  when performing the seam welding described below. 
     A 1 - 3 . Electronic Device Manufacturing Method 
       FIG. 4  is a diagram illustrating a flow of a method of manufacturing the electronic device  1 . As illustrated in  FIG. 4 , the method of manufacturing the electronic device  1  includes a component mounting step S 10 , a lid placing step S 20 , and a bonding step S 30 . Hereinafter, each step will be described sequentially. 
     A 1 - 3 a. Component Mounting Step S 10   
     In the component mounting step S 10 , first, each component configuring the electronic device  1  is prepared. Specifically, the vibrator element piece  10 , the support member  20 , the circuit element  30 , the base  41 , the lid  42 , and the bonding member  43  are prepared. The vibrator element  10 , the support member  20 , the circuit element  30 , the base  41 , and the bonding member  43  are each manufactured by, for example, a known method. A method of manufacturing the lid  42  is not limited in particular, and includes, for example, a method of etching a metal plate and a method of pressing the metal plate, but it is preferable to use the method of pressing the metal plate. In this case, there is an advantage that it is easy to achieve both the dimensional accuracy of the lid  42  and productivity. This point will be specifically described below. 
       FIG. 5  is a cross-sectional view illustrating a state before pressing when the lid  42  is manufactured by pressing. As illustrated in  FIG. 5 , a flat metal plate  420  is first installed between a pair of molds  101  and  102 . The metal plate  420  is a plate member formed of a metal such as Kovar,  42  alloy, stainless steel, or the like. The mold  101  has a surface  101   a  that forms one surface of the lid  42 . The surface  101   a  includes a portion having a shape corresponding to the stepped surface  44  described above. The mold  102  has a surface  102   a  forming another surface of the lid  42 . The surface  102   a  has a portion forming a shape corresponding to the groove  421  described above. 
       FIG. 6  is a cross-sectional view illustrating a state when pressing when the lid  42  is manufactured by pressing. As illustrated in  FIG. 6 , the lid  42  is obtained by pressure-forming the metal plate  420  by using a pair of molds  101  and  102 . The above-described pressing has an advantage that the shape of the lid  42  in a plan view, the groove  421 , and the stepped surface  44  are formed collectively. 
       FIG. 7  is a cross-sectional view illustrating an arrangement state of each member in the component mounting step S 10 . In the component mounting step S 10 , the vibrator element  10 , the support member  20 , and the circuit element  30  are mounted on the base  41  as illustrated in  FIG. 7 . More specifically, for example, the vibrator element  10  is fixed previously to the support member  20  by the metal bumps  72 , the circuit element  30  is fixed to the base  41  by the fixing member  51 , and thereafter the support member  20  is fixed to each of the vibrator elements  10  by the fixing member  52 . Further, the bonding member  43  is bonded to the base  41  by soldering or the like. 
     A 1 - 3 b. Lid placing step S 20   
       FIG. 8  is a plan view illustrating a positional relationship between the base  41  and the lid  42  in the lid placing step S 20 . In the lid placing step S 20 , the lid  42  is placed on the base  41  via the bonding member  43  as illustrated in  FIG. 8 . Here, a corner of the stepped surface  44  of the lid  42  is located between an inner circumference and an outer circumference of the region R where the lid  42  and the bonding member  43  overlap in a plan view. The outer edge E 0  of the lid  42  is also located between the inner circumference and the outer circumference of the region R where the lid  42  and the bonding member  43  overlap in a plan view. In  FIG. 8 , the region R is illustrated in a dot pattern. 
     A 1 - 3 c. Bonding step S 30   
       FIG. 9  is a cross-sectional view illustrating an outline of the seam welding in the bonding step S 30 . As illustrated in  FIG. 9 , during the bonding step S 30 , the base  41  and the lid  42  are bonded by the seam welding via the bonding member  43  by using a seam welding machine  200 . The seam welding machine  200  includes a pair of roller electrodes  201  and a power source  202  that allows a current to flow between the electrodes. 
     The pair of roller electrodes  201  can rotate around the same axis line AX and are spaced apart from each other in a direction parallel to the axis line AX. An interval is determined according to a length of the lid  42  in the X direction or the Y direction. Each of the pair of roller electrodes  201  has a circular shape in a cross section perpendicular to the axis line AX, and has a shape in which an outer diameter becomes smaller at a predetermined taper angle θ 0  when going between the electrodes. The taper angle θ 0  is not limited in particular, and is in a range, for example, more than or equal to 5° and less than or equal to 25°. 
     The pair of roller electrodes  201  is in pressure contact with the lid  42  by a pressure mechanism (not illustrated. The pair of roller electrodes  201  travels at a predetermined speed along a pair of sides of the lid  42  parallel to each other in a plan view while rotating around the axis lines. At this time, the power source  202  causes Joule heat to be generated in the bonding member  43  by causing a current to flow between the pair of roller electrodes  201  via the lid  42  and the bonding member  43  along a path RT illustrated in  FIG. 9 . By melting the lid  42  and the bonding member  43  by using the Joule heat, the lid  42  and the bonding member  43  are bonded together. In the same manner as described above, the lid  42  and the bonding member  43  are also bonded to the remaining pair of sides of the lid  42  parallel to each other in a plan view. 
       FIG. 10  is a view illustrating a state of a current flowing from the lid  42  toward the base  41  during the seam welding in the first embodiment. As illustrated in  FIG. 10 , a stepped surface  44  is provided on the surface of the lid  42  opposite to the base  41 . Here, when viewed from a cross section perpendicular to the direction in which the outer edge E 0  extends, an angle θ 1  formed by a line segment coupling the outer edge E 0  to the corner of the stepped surface  44  and a line segment perpendicular to the thickness direction of the lid  42  is larger than the taper angle θ 0  of the roller electrode  201 . Accordingly, the roller electrode  201  does not come into contact with the outer edge E 0  but comes into contact with the corner of the stepped surface  44  at the contact position PC. Here, a difference between the angle θ 1  and the taper angle θ 0  is not limited in particular, and is preferably within a range, for example, more than or equal to 5° and less than or equal to 20° from a viewpoint of ease and the like of manufacturing the lid  42 , and it is more preferably to be in a range more than or equal to 10° and less than or equal to 15°. 
     A ratio between the width W 2  and a width W of the region R is preferably in a range more than or equal to 0.4 and less than or equal to 0.6. If the ratio is within the range, the roller electrode  201  can come into contact with the lid  42  near the center in a width direction of the region R. As a result, as illustrated in  FIG. 10 , it is possible to extremely reduce a difference between a length of a path RT 2  of a current flowing from the roller electrode  201  toward an inner circumference of the region R and a length of a path RT 1  of a current flowing toward an outer circumference of the region R. The width W is a length of the region R in the direction along an axis of the roller electrode  201 . The width W 2  is a distance between the outer edge E 0  of the lid  42  in the direction along the axis of the roller electrode  201  and the contact position PC. In the case illustrated in  FIG. 10 , a length of a path RT 3  of the current flowing from the roller electrode  201  toward the center of the region R is slightly smaller than the length of each of the paths RT 1  and RT 2 . 
       FIG. 11  is a diagram illustrating a state of a current flowing from a lid  42 X toward the base  41  during seam welding of related art. In the related art, since a thickness of the lid  42 X is uniform, the roller electrode  201  is in contact with an outer edge EX of the lid  42 X. Accordingly, as illustrated in  FIG. 11 , the difference between the length of the path RT 2  of a current flowing from the roller electrode  201  toward the inner peripheral edge of the region R and the length of the path RT 1  of a current flowing toward the outer peripheral edge of the region R is extremely large. In the case illustrated in  FIG. 11 , the length of the path RT 2  is longer than the length of the path RT 1 . In the case illustrated in  FIG. 11 , the length of the path RT 3  of a current flowing from the roller electrode  201  toward the center of the region R is a length between the length of the path RT 1  and the length of the path RT 2 . 
     After the above-described seam welding, in the present embodiment, the space S is depressurized by using the groove  421  of the lid  42  as an exhaust hole. Thereafter, the groove  421  of the lid  42  is closed by using an energy ray such as laser light or an electron beam in a depressurization atmosphere or an inert gas atmosphere. Thereby, the electronic device  1  is obtained. 
     In the method of manufacturing the electronic device described above, the vibrator element  10  which is an electronic component, the support member  20 , and the circuit element  30  are mounted on the base  41 , the lid  42  is placed on the base  41 , and the base  41  and the lid  42  are bonded by seam welding. In the seam welding, the roller electrode  201  and the lid  42  are brought into contact with each other at the contact position PC that overlaps the region R to be welded between the base  41  and the lid  42  inside the outer edge E 0  of the lid  42  in a plan view. Accordingly, compared with the case where the roller electrode  201  comes into contact with the outer edge E 0  of the lid  42 , the difference between the length of the path RT 2  of the current flowing from the roller electrode  201  toward the inner peripheral edge of the region R and the length of the path RT 1  of the current flowing toward the outer peripheral edge of the region R can be reduced. As a result, it is possible to reduce a variation in current in the region R to be welded and to reduce welding unevenness between the base  41  and the lid  42 . 
     In the present embodiment, a surface of the lid  42  opposite to the base  41  includes the stepped surface  44  having a stepped shape that approaches the base  41  toward the outer edge E 0  of the lid  42  in a portion overlapping the region R in a plan view. According to the lid  42  including the stepped surface  44 , when the lid  42  is manufactured by pressing, there is an advantage that the lid  42  can be easily and accurately formed together with other portions of the lid  42 . 
     A 2 . Second Embodiment 
     Next, a second embodiment will be described. The present embodiment is the same as the first embodiment described above except that the lid has a different shape. In the following description, the second embodiment will be described by focusing on a difference from the first embodiment described above, and description on the same matter will be omitted. Further, in the figure used for description of the second embodiment, the same symbol or reference numeral is attached to the same configuration as in the first embodiment described above. 
       FIG. 12  is a cross cross-sectional view illustrating a shape of a lid  42 A according to the second embodiment. The lid  42 A used for an electronic device  1 A illustrated in  FIG. 12  includes the first portion  45  and a second portion  46 A thinner than the first portion  45  in a portion overlapping the region R in a plan view. The second portion  46 A has a shape in which a thickness continuously decreases from the first portion  45  toward the outer edge E 0  of the lid  42 A. Here, a surface of the second portion  46 A opposite to the base  41  is a flat inclined surface  44 A that is inclined at an angle θ 1  with respect to a plane perpendicular to a thickness direction of the lid  42 A. 
     As described above, the surface of the lid  42 A opposite to the base  41  has the inclined surface  44 A that approaches the base  41  toward the outer edge E 0  of the lid  42 A in a portion overlapping the region R in a plan view. The inclined surface  44 A has an advantage that, when being manufactured by pressing, the lid  42 A can be easily and highly accurately formed together with other portions of the lid  42 A. In the present embodiment, since there is no step difference between the first portion  45  and the second portion  46 A, there is an advantage that, when the lid  42 A is manufactured by pressing, releasability is better than the releasability in the first embodiment. 
     In the lid  42 A having the above-described configuration, an end of the inclined surface  44 A on the first portion  45  side is in contact with the roller electrode  201  as the contact position PC during seam welding. The second embodiment described above also provides the same effects as in the first embodiment described above. 
     Here, the angle θ 1  formed by a plane orthogonal to the thickness direction of the base  41  and the inclined surface  44 A is larger than the taper angle θ 0  that is an angle formed by the outer peripheral surface of the roller electrode  201  and a central axis of the roller electrode  201 . Accordingly, it is possible to prevent the roller electrode  201  and the outer edge E 0  of the lid  42 A from coming into contact with each other. 
     A 3 . Third Embodiment 
     Next, a third embodiment will be described. The present embodiment is the same as the first embodiment described above except that the lid has a different shape. In the following description, the third embodiment will be described by focusing on a difference from the first embodiment described above, and description on the same matters will be omitted. Further, in the figure used for description of the third embodiment, the same symbol or reference numeral is attached to the same configuration as in the first embodiment described above. 
       FIG. 13  is a cross cross-sectional view illustrating a shape of a lid  42 B according to the third embodiment. The lid  42 B used for an electronic device  1 B illustrated in  FIG. 13  includes a first portion  45 B and a second portion  46 B thinner than the first portion  45 B in a portion overlapping the region R in a plan view. The first portion  45 B has a constant thickness T 1 . The second portion  46 B includes the outer edge E 0  of the lid  42 B and is a portion between the outer edge E 0  and the first portion  45 B. The second portion  46 B has a shape in which a thickness continuously decreases from the first portion  45 B toward the outer edge E 0  of the lid  42 B. Here, a surface of the second portion  46 B opposite to the base  41  is a curved surface  44 B of a projection shape that is inclined with respect to a plane perpendicular to a thickness direction of the lid  42 A. 
     As described above, a surface of the lid  42 B opposite to the base  41  has the curved surface  44 B that approaches the base  41  toward the outer edge E 0  of the lid  42 B in a portion overlapping the region R in a plan view. The curved surface  44 B has an advantage that, when being manufactured by pressing, the lid  42 B can be easily and accurately formed together with other portions of the lid  42 B. In the present embodiment, since the curved surface  44 B is a projection surface, there is also an advantage that a variation in a contact area between the roller electrode  201  and the lid  42 B can be reduced. 
     In the lid  42 B having the above-described configuration, the curved surface  44 B is in contact with the roller electrode  201  during seam welding. The third embodiment described above also provides the same effects as in the first embodiment described above. 
     A 4 . Fourth Embodiment 
     Next, a fourth embodiment will be described. The present embodiment is the same as the first embodiment described above except that the lid has a different shape. In the following description, the fourth embodiment will be described by focusing on a difference from the first embodiment described above, and description on the same matters will be omitted. Further, in the figure used for description of the fourth embodiment, the same symbol or reference numeral is attached to the same configuration as in the first embodiment described above. 
       FIG. 14  is a cross cross-sectional view illustrating a shape of a lid  42 C according to the fourth embodiment. The lid  42 C used for an electronic device  1 C illustrated in  FIG. 14  includes a first portion  45 C and the second portion  46  and a third portion  47  thinner than the first portion  45 C in a portion overlapping the region R in a plan view. The first portion  45 C is provided between the second portion  46  and the third portion  47 . Thicknesses of the second portion  46  and the third portion  47  may be the same or different. Here, a projection portion  44 C by the first portion  45 C is provided in a surface of the lid  42   c  opposite to the base  41 . 
     As described above, the surface of the lid  42 C opposite to the base  41  has a projection portion  44 C provided along the outer edge E 0  of the lid  42 C on the inner side more than on the outer edge E 0  of the lid  42 C in a portion overlapping the region R in a plan view. The projection portion  44 C has an advantage that a variation of the contact position PC between the roller electrode  201  and the lid  42 C can be easily reduced. A width of the projection portion  44 C is not limited in particular and is preferably in a range more than or equal to 1/10 times and less than or equal to ½ times the width W of the region R from a viewpoint of suitably obtaining the advantage. 
     In the lid  42 C having the above-described configuration, the projection portion  44 C is in contact with the roller electrode  201  during seam welding. The fourth embodiment described above also provides the same effects as in the first embodiment described above. 
     B. Electronic Apparatus 
       FIG. 15  is a perspective view schematically illustrating a configuration of a mobile type or notebook type personal computer  1100  that is an example of an electronic apparatus. In this figure, the personal computer  1100  includes a main body portion  1104  having a keyboard  1102  and a display unit  1106  having a display portion  1108 . The display unit  1106  is rotatably supported to the main body portion  1104  via a hinge structure. The above-described electronic device  1  that functions as a gyro sensor is embedded in the personal computer  1100  described above. 
       FIG. 16  is a plan view schematically illustrating a configuration of a smartphone  1200  that is an example of the electronic apparatus. In this figure, the smartphone  1200  includes a plurality of operation buttons  1202 , an earpiece  1204  and a mouthpiece (not illustrated), and a display portion  1208  disposed between the operation buttons  1202  and the earpiece  1204 . The above-described electronic device  1  that functions as a gyro sensor is embedded in the smartphone  1200  described above. 
       FIG. 17  is a perspective view schematically illustrating a configuration of a digital still camera  1300  which is an example of the electronic apparatus. In this figure, a connection with an external device is also simply illustrated. The digital still camera  1300  generates an imaging signal (image signal) by photoelectrically converting an optical image of an object by using an imaging element such as a charge coupled device (CCD). 
     A display portion  1310  that performs display based on an imaging signal from the CCD is provided on the back of a case  1302  in the digital still camera  1300 . The display portion  1310  functions as a viewfinder that displays an object as an electronic image. A light receiving unit  1304  including an optical lens (imaging optical system), a CCD, and the like is provided on a front side (a back side in the drawing) of the case  1302 . 
     If a photographer confirms an object image displayed on the display portion  1310  and presses a shutter button  1306 , a CCD imaging signal at that time is transferred to the memory  1308  to be stored therein. In the digital still camera  1300 , a video signal output terminal  1312  and an input/output terminal  1314  for data communication are provided on a side surface of the case  1302 . As illustrated in the figure, a television monitor  1430  is connected to a video signal output terminal  1312 , and a personal computer  1440  is connected to an input/output terminal  1314  for data communication as necessary. Further, the imaging signal stored in the memory  1308  is output to the television monitor  1430  or the personal computer  1440  by a predetermined operation. The above-described electronic device  1  that functions as a gyro sensor is embedded in the digital still camera  1300  described above. 
     Since the above-described electronic apparatus includes the electronic device  1 , characteristics of the electronic apparatus can be improved by a high reliability of the electronic device  1 . 
     In addition to the personal computer, the smartphone, and the digital still camera described above, for example, a mobile phone other than the smartphone, a tablet terminal, a timepiece, a car body posture detection device, a pointing device, a head-mounted display, an ink jet printer, a laptop personal computer, a television, a video camera, a video tape recorder, a navigation device, a pager, an electronic notebook, an electronic dictionary, a calculator, an electronic game device, a game controller, a word processor, a workstation, a video phone, a TV monitor for security, electronic binoculars, a point of sale system (POS) terminal, an electronic thermometer, a blood pressure meter, a blood glucose meter, an electrocardiogram measurement device, an ultrasonic diagnosis device, an electronic endoscope, a fish detector, various measurement apparatuses, various measurement instruments, a flight simulator, and the like can be used as an electronic apparatus in which the electronic device  1  is mounted. 
     C. Vehicle 
       FIG. 18  is a perspective view schematically illustrating an automobile  1500  which is an example of a vehicle. In this figure, the above-described electronic device  1  that functions as a gyro sensor is embedded in the automobile  1500 . The electronic device  1  can be widely applied to an electronic control unit (ECU)  1501  such as a keyless entry, an immobilizer, a navigation system, an air conditioner, an antilock brake system (ABS), an airbag, a tire pressure monitoring system (TPMS), an engine control, a battery monitor for a hybrid car or an electric car, a car body posture control system, or the like. In addition to the automobile, for example, a vehicle, an aircraft, a rocket, a ship, and the like can be used as the vehicle in which the electronic apparatus is mounted. 
     Since the above-described vehicle includes the electronic device  1 , characteristics of the vehicle can be improved by a high reliability of the electronic device  1 . 
     D. Modification Example 
     As described above, the electronic manufacturing method, the electronic device, the electronic apparatus, and the vehicle according to the present disclosure are described based on the illustrated embodiments, and the present disclosure is not limited to these. Further, configurations of the respective units of the present disclosure can be substituted by any structure which exhibits the same function of the embodiment described above, and any configuration can also be added thereto. Further, in the present disclosure, any configurations of the respective embodiments described above may be combined with each other. 
     Although a case where the vibrator element is made of a piezoelectric material is exemplified in the above-described embodiment, the configuration material of the vibrator element is not limited to the exemplification and may be, for example, a non-piezoelectric material such as silicon or quartz. In this case, for example, the piezoelectric element may be provided on a base made of the non-piezoelectric material. Further, when the vibrator element is made of silicon, the vibrator element with high dimensional accuracy can be manufactured at a relatively low cost by using a known fine processing technique such as etching. 
     Although a case where a piezoelectric drive method is used as a method of driving the vibrator element is exemplified in the above-described embodiment, the method of driving the vibrator element is not limited to the exemplification and may be, for example, an electrostatic drive method or an electromagnetic drive method. Likewise, although a case where a piezoelectric detection method is used as a method of detecting the vibrator element is exemplified in the above-described embodiment, the method of detecting the vibrator element is not limited to this and may be, for example, a capacitance detection method, a piezoresistance detection method or an electromagnetic detection method. 
     Furthermore, although a case where the vibrator element is a double T-type sensor element is exemplified in the above-described embodiment, the vibrator element is not limited to the exemplification and may be, for example, an H tuning fork type sensor element or another sensor element of a tuning fork type or may be a vibrator element or the like for oscillator. 
     Further, although a case where a vibrator element, a support member, and a circuit element are used as electronic components to be mounted on a base is exemplified in the above-described embodiment, the electronic component may be an electronic component other than the exemplification, and any one or more electronic components may be mounted on the base. However, in the vibrator element in the above-described embodiment, airtightness in the package has an extremely large influence on characteristics of the electronic device compared to other electronic components, and thus, effects of the present disclosure are remarkably exhibited. 
     Furthermore, although a configuration in which a base has a box shape and a lid has a plate shape is illustrated in the above-described embodiment, the present disclosure is not limited to the configuration. For example, the base may have a plate shape and the lid may have a box shape or a hat shape. 
     Further, although a case where a groove used as an exhaust hole is provided in a lid is exemplified in the above-described embodiment, the groove may be omitted. In this case, a hole used as the exhaust hole may be provided in the base. The hole is closed with a sealing material formed of, for example, an Au—Ge alloy or the like.