Patent Publication Number: US-2023155567-A1

Title: Vibrator device

Description:
The present application is based on, and claims priority from JP Application Serial Number 2021-187667, filed Nov. 18, 2021, the disclosure of which is hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a vibrator device. 
     2. Related Art 
     In related art, as shown in JP-A-2006-67552, a piezoelectric oscillator (vibrator device) in which a piezoelectric vibrator and an IC chip as a circuit for oscillating the piezoelectric vibrator are placed in upward and downward directions of a substrate is known. The piezoelectric vibrator, the IC chip, and the substrate are placed as described above, and thereby, the piezoelectric oscillator may be downsized. 
     However, in the piezoelectric oscillator disclosed in JP-A-2006-67552, distances between a pair of wires for electrically coupling the piezoelectric vibrator and the IC chip and oscillating the piezoelectric vibrator and a wire for electrically coupling a mounted terminal of the piezoelectric oscillator and the IC chip and outputting an output signal such as a clock signal are smaller. Accordingly, parasitic capacitances produced between the pair of wires for oscillating the piezoelectric vibrator and the wire for outputting the output signal increase. With the increase of the parasitic capacitances, the difference between the parasitic capacitance between one wire of the pair of wires for oscillating the piezoelectric vibrator and the wire for outputting the output signal and the parasitic capacitance between the other wire of the pair of wires for oscillating the piezoelectric vibrator and the wire for outputting the output signal increases. There is a problem that, when the difference in parasitic capacitance increases, frequency-power characteristics of the piezoelectric oscillator are deteriorated. 
     Note that the frequency-power characteristics refer to fluctuations of the output frequency relative to fluctuations of the power supply voltage, and the deterioration of the frequency-power characteristics means that the fluctuations of the output frequency relative to the fluctuations of the power supply voltage are larger. 
     SUMMARY 
     A vibrator device is a vibrator device having a base, a semiconductor element having an oscillation circuit, and a vibrator having an excitation electrode sequentially stacked and including a first wire electrically coupling between the excitation electrode and the semiconductor element, a second wire electrically coupling between an external output terminal placed on the base and the semiconductor element, and a shield wire placed between at least a part of the first wire and at least a part of the second wire. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a sectional view of a vibrator device according to embodiment 1. 
         FIG.  2    is a plan view of the vibrator device according to embodiment 1. 
         FIG.  3    is a plan view of a base according to embodiment 1. 
         FIG.  4    is a sectional view of a vibrator according to embodiment 1. 
         FIG.  5    is a plan view of a vibrator element according to embodiment 1. 
         FIG.  6    is a sectional view of a vibrator device according to embodiment 2. 
         FIG.  7    is a sectional view of the vibrator device according to embodiment 3. 
         FIG.  8    is a sectional view of a vibrator device according to embodiment 4. 
         FIG.  9    is a plan view of a first base substrate according to embodiment 4. 
         FIG.  10    is a plan view of a base according to embodiment 4. 
         FIG.  11    is a plan view of the vibrator device according to embodiment 4. 
         FIG.  12    is a sectional view along line A-A in  FIG.  10   . 
         FIG.  13    is a sectional view of a vibrator device according to embodiment 5. 
         FIG.  14    is a plan view of the vibrator device according to embodiment 5. 
         FIG.  15    is a plan view of a base according to embodiment 5. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Next, referring to the drawings, embodiments of the present disclosure will be explained. 
     For convenience of explanation, the following respective drawings show an X-axis, a Y-axis, and a Z-axis as three axes orthogonal to one another. Directions along the X-axis are referred to as “X directions”, directions along the Y-axis are referred to as “Y directions”, and directions along the Z-axis are referred to as “Z directions”. Further, head sides of arrows in the respective axial directions are referred to as “plus sides” and tail sides of the arrows are referred to as “minus sides”. For example, the Y directions refer to both directions toward the plus side in the Y direction and the minus side in the Y direction. Furthermore, the plus side in the Z direction is also referred to as “upper” and the minus side in the Z direction is also referred to as “lower”. A plan view from the Z direction is also simply referred to as “plan view”. 
     1. Embodiment 1 
     A vibrator device  1  according to embodiment 1 will be explained with reference to  FIGS.  1  to  5   . In the embodiment, the vibrator device  1  is an oscillator. Note that the vibrator device  1  is not necessarily the oscillator. For example, the vibrator device  1  may be an inertial sensor. 
     As shown in  FIGS.  1  and  2   , the vibrator device  1  has the base  2 , the semiconductor element  3 , and the vibrator  4 . The base  2 , the semiconductor element  3 , and the vibrator  4  are sequentially stacked along the Z directions as upward and downward directions. In the embodiment, the semiconductor element  3  is placed on an upper surface of the base  2  and the vibrator  4  is placed on an upper surface of the semiconductor element  3 . A mold portion M is provided at an upper surface side of the base  2  to seal the semiconductor element  3  and the vibrator  4 . Note that, in  FIG.  2   , the mold portion M is omitted for convenience of explanation. 
     The respective units of the vibrator device  1  including the semiconductor element  3  and the vibrator  4  may be protected from water, dust, impact, etc. by the mold portion M. The material forming the mold portion M is not particularly limited. As the material forming the mold portion M, e.g. a thermosetting resin such as epoxy resin may be used. The mold portion M may be formed using e.g. compression molding. Note that the mold portion M is used in the embodiment, however, the semiconductor element  3  and the vibrator  4  may be sealed by bonding of a lid member having a recessed portion that can house the semiconductor element  3  and the vibrator  4  to the upper surface of the base  2 . 
     First, the base  2  will be explained. 
     In the embodiment, the base  2  is in a plate shape. The base  2  has the upper surface as a surface facing the semiconductor element  3  in the base  2 , the lower surface having a front-back relation to the upper surface of the base  2 , and a side surface coupling the upper surface and the lower surface of the base  2 . The material forming the base  2  is not particularly limited. For example, a ceramic substrate or the like may be used as the base  2 . 
     As shown in  FIGS.  1  and  3   , on the lower surface of the base  2 , a first external terminal  221 , a second external terminal  222 , a third external terminal  223 , and a fourth external terminal  224  are placed. The first external terminal  221 , the second external terminal  222 , the third external terminal  223 , and the fourth external terminal  224  are external terminals for electrically coupling the vibrator device  1  to the outside. 
     The first external terminal  221  is placed in a corner at the plus side in the X direction and the plus side in the Y direction on the lower surface of the base  2 . The second external terminal  222  is placed in a corner at the plus side in the X direction and the minus side in the Y direction on the lower surface of the base  2 . The third external terminal  223  is placed in a corner at the minus side in the X direction and the minus side in the Y direction on the lower surface of the base  2 . The fourth external terminal  224  is placed in a corner at the minus side in the X direction and the plus side in the Y direction on the lower surface of the base  2 . 
     The first external terminal  221  is a ground terminal for coupling to a ground potential. The ground potential in the present disclosure refers to a reference potential having a fixed potential. The second external terminal  222  is an external output terminal for outputting a reference signal such as a clock signal. The third external terminal  223  is a power supply terminal for coupling to a power supply. The fourth external terminal  224  is an output enable terminal for controlling the output from the second external terminal  222  as an external output terminal. 
     Further, in the base  2 , a plurality of vias  231 ,  232 ,  233 ,  234  penetrating between the upper surface and the lower surface of the base  2  are provided. The vias  231 ,  232 ,  233 ,  234  are respectively through electrodes formed by filling of through holes penetrating the base  2  with conductors. The via  231 , the via  232 , the via  233 , and the via  234  are placed to overlap with the first external terminal  221 , the second external terminal  222 , the third external terminal  223 , and the fourth external terminal  224  in the plan view, respectively. 
     As shown in  FIGS.  2  and  3   , on the upper surface of the base  2 , a first coupling wire  211 , a second coupling wire  212 , a third coupling wire  213 , a fourth coupling wire  214 , a fifth coupling wire  215 , and a sixth coupling wire  216  respectively electrically coupled to the semiconductor element  3  are placed. 
     The first coupling wire  211  is placed to overlap with the via  231  in the plan view. The first coupling wire  211  and the first external terminal  221  are electrically coupled via the via  231 . That is, the first coupling wire  211  is electrically coupled to the ground potential via the first external terminal  221  as the ground terminal and the via  231 . Note that the first coupling wire  211  may function as a shield wire  20  as will be described later. 
     The second coupling wire  212  is placed to overlap with the via  232  in the plan view. Further, the second coupling wire  212  and the second external terminal  222  are electrically coupled via the via  232 . 
     The third coupling wire  213  is placed to overlap with the via  233  in the plan view. Further, the third coupling wire  213  and the third external terminal  223  are electrically coupled via the via  233 . A part of the fourth coupling wire  214  is placed to overlap with the fourth external terminal  224  and the via  234  in the plan view. Further, the fourth coupling wire  214  and the fourth external terminal  224  are electrically coupled via the via  234 . 
     The fifth coupling wire  215  and the sixth coupling wire  216  are placed between the third coupling wire  213  and the fourth coupling wire  214  on the upper surface of the base  2 . The third coupling wire  213 , the fifth coupling wire  215 , the sixth coupling wire  216 , and the fourth coupling wire  214  are sequentially placed toward the plus side in the Y direction. 
     Further, the fifth coupling wire  215  and sixth coupling wire  216  and the second coupling wire  212  are placed with the vibrator  4  in between in the plan view. Specifically, the fifth coupling wire  215  and sixth coupling wire  216  forming parts of first wires  101 ,  102  are placed at the minus side in the X direction as one side of the vibrator  4  in the plan view. The second coupling wire  212  forming a part of a second wire  103  is placed at the plus side in the X direction as the other side of the vibrator  4  in the plan view. Note that the first wires  101 ,  102  and the second wire  103  will be described later. 
     Next, the semiconductor element  3  will be explained. 
     As shown in  FIG.  1   , the semiconductor element  3  has a semiconductor substrate  31  and a circuit unit  32 . In the embodiment, the circuit unit  32  is placed on a lower surface of the semiconductor substrate  31 . That is, the upper surface of the semiconductor element  3  is an upper surface of the semiconductor substrate  31  and the lower surface of the semiconductor element  3  is a lower surface of the circuit unit  32 . 
     The semiconductor substrate  31  is in a plate shape. The material forming the semiconductor substrate  31  is not particularly limited. For example, silicon, germanium, silicon germanium, or the like may be used as the semiconductor substrate  31 . 
     The circuit unit  32  is an integrated circuit in which active elements including a plurality of transistors (not shown) are electrically coupled by wires (not shown). The circuit unit  32  has an oscillation circuit  33  generating the frequency of the reference signal such as a clock signal by oscillating a vibrator element  5  of the vibrator  4 . Note that the circuit unit  32  may have a temperature compensated circuit correcting the vibration characteristics of the vibrator element  5  according to temperature changes, a processing circuit processing an output signal from the oscillation circuit  33 , an electrostatic protection circuit, or the like in addition to the oscillation circuit  33 . 
     As shown in  FIGS.  1  and  2   , on the lower surface of the semiconductor element  3 , a first coupling terminal  321 , the second coupling terminal  322 , a third coupling terminal  323 , a fourth coupling terminal  324 , a fifth coupling terminal  325 , and a sixth coupling terminal  326  are placed. The first coupling terminal  321 , the second coupling terminal  322 , the third coupling terminal  323 , the fourth coupling terminal  324 , the fifth coupling terminal  325 , and the sixth coupling terminal  326  are electrically coupled to the circuit unit  32  by wires (not shown). 
     The fifth coupling terminal  325  and sixth coupling terminal  326  and the second coupling terminal  322  are placed with the vibrator  4  in between in the plan view. Specifically, the fifth coupling terminal  325  and sixth coupling terminal  326  are placed at the minus side in the X direction as one side of the vibrator  4  in the plan view. The second coupling terminal  322  is placed at the plus side in the X direction as the other side of the vibrator  4  in the plan view. 
     The first coupling terminal  321  is a ground terminal for coupling to a ground potential. The second coupling terminal  322  is a reference signal output terminal for outputting the reference signal such as a clock signal. The third coupling terminal  323  is a power supply terminal for coupling to a power supply. The fourth coupling terminal  324  is an output enable terminal for controlling the output from the second coupling terminal  322  as the reference signal output terminal. The fifth coupling terminal  325  and the sixth coupling terminal  326  are drive signal output terminals for outputting drive signals that oscillate the vibrator  4 . The vibrator  4  oscillates according to the drive signals output from the fifth coupling terminal  325  and the sixth coupling terminal  326 . 
     Further, bumps B 1 , B 2 , B 3 , B 4 , B 5 , B 6  are placed between the base  2  and the semiconductor element  3 . The base  2  and the semiconductor element  3  are bonded via the bumps B 1 , B 2 , B 3 , B 4 , B 5 , B 6 . That is, the semiconductor element  3  is mounted on the upper surface of the base  2  via the bumps B 1 , B 2 , B 3 , B 4 , B 5 , B 6  using flip-chip bonding. The bumps B 1 , B 2 , B 3 , B 4 , B 5 , B 6  are not particularly limited as long as the bumps have conductivity and bondability. For example, gold bumps, silver bumps, copper bumps, solder bumps, or the like may be used. 
     Specifically, for example, the bump B 1  is placed to overlap with the first coupling wire  211  placed on the upper surface of the base  2  and the first coupling terminal  321  placed on the lower surface of the semiconductor element  3  in the plan view. In this manner, the first coupling terminal  321  and the first coupling wire  211  are electrically coupled via the bump B 1 . 
     Similarly, the second coupling terminal  322  and the second coupling wire  212  are electrically coupled via the bump B 2 . The third coupling terminal  323  and the third coupling wire  213  are electrically coupled via the bump B 3 . The fourth coupling terminal  324  and the fourth coupling wire  214  are electrically coupled via the bump B 4 . The fifth coupling terminal  325  and the fifth coupling wire  215  are electrically coupled via the bump B 5 . The sixth coupling terminal  326  and the sixth coupling wire  216  are electrically coupled via the bump B 6 . Note that the bumps B 1 , B 2 , B 3 , B 4 , B 5 , B 6  may be provided on any one of the base  2  and the semiconductor element  3 . 
     The vibrator  4  is placed on the upper surface of the semiconductor element  3 . The semiconductor element  3  and the vibrator  4  are bonded via an adhesive D 1 . 
     Next, the vibrator  4  will be explained. 
     As shown in  FIGS.  1  and  4   , the vibrator  4  has the vibrator element  5  and a package  6  housing the vibrator element  5 . 
     First, the vibrator element  5  will be explained. As shown in  FIGS.  4  and  5   , the vibrator element  5  has a vibrator substrate  51  and electrodes  52  placed on surfaces of the vibrator substrate  51 . 
     The vibrator substrate  51  is in a plate shape. The vibrator substrate  51  has a thin vibrating portion  511  and a thick portion  512  located around the vibrating portion  511  and having a larger thickness than the vibrating portion  511 . In the embodiment, the vibrator substrate  51  is an AT cut quartz crystal substrate. 
     The electrodes  52  have a pair of excitation electrodes  521 ,  522 , a pair of pad electrodes  523 ,  524 , and a pair of lead wires  525 ,  526 . The excitation electrode  521  is placed on an upper surface of the vibrating portion  511 . The excitation electrode  522  is placed on a lower surface of the vibrating portion  511 . The excitation electrode  521  and the excitation electrode  522  are placed in positions facing via the vibrator substrate  51 . The pad electrode  523  is placed on an upper surface of the thick portion  512 . The pad electrode  524  is placed on a lower surface of the thick portion  512 . The pad electrode  523  and the pad electrode  524  are placed in positions facing via the vibrator substrate  51 . The lead wire  525  is placed on the upper surface of the thick portion  512  and electrically couples the excitation electrode  521  and the pad electrode  523 . The lead wire  526  is placed on the lower surface of the thick portion  512  and electrically couples the excitation electrode  522  and the pad electrode  524 . 
     Drive signals are applied to the excitation electrodes  521 ,  522  via the pad electrodes  523 ,  524  and the lead wires  525 ,  526 , and thereby, a thickness-shear vibration may be excited in the vibrating portion  511  sandwiched between the excitation electrodes  521 ,  522 . 
     As above, the vibrator element  5  is briefly explained. 
     Note that the configuration of the vibrator element  5  is not limited to the above described configuration. For example, the vibrator element  5  is not limited to a vibrator element in a plate shape that produces a thickness-shear vibration. For example, a vibrator element having a plurality of vibrating arms flexurally vibrating in in-plane directions or a vibrator element having a plurality of vibrating arms flexurally vibrating in out-of-plane directions may be employed. Further, for example, a vibrator element using an X cut quartz crystal substrate, a Y cut quartz crystal substrate, a Z cut quartz crystal substrate, a BT cut quartz crystal substrate, an SC cut quartz crystal substrate, an ST cut quartz crystal substrate, or the like as the vibrator substrate  51  may be employed. Alternatively, for example, a vibrator element using another piezoelectric material than the quartz crystal may be employed. Alternatively, for example, a SAW (Surface Acoustic Wave) resonator or an MEMS (Micro Electro Mechanical Systems) vibrator in which a piezoelectric element is placed on a semiconductor substrate of silicon or the like may be employed. 
     Next, the package  6  housing the vibrator element  5  will be explained. 
     As shown in  FIG.  4   , the package  6  has a base member  61  and a lid  62  as a lid member. In the embodiment, the lid  62  is placed on a lower surface of the base member  61 . That is, the upper surface of the vibrator  4  is an upper surface of the base member  61  and the lower surface of the vibrator  4  is a lower surface of the lid  62 . 
     The base member  61  is in a box shape having a recessed portion  611 . The recessed portion  611  has an opening part at the lower surface side of the base member  61 . In other words, the base member  61  has a base portion  612  in a plate shape and a side wall portion  613  in a frame shape stood downward from the outer peripheral part of the base portion  612 . 
     The lid  62  is in a plate shape. The lid  62  is bonded to the lower surface of the base member  61  to close the opening part of the recessed portion  611 . The recessed portion  611  is closed by the lid  62 , and thereby, a housing space S is formed. The vibrator element  5  is housed in the housing space S. For example, the housing space S is depressurized. 
     Materials forming the base member  61  and the lid  62  are not particularly limited. As the base member  61  and the lid  62 , e.g. ceramics substrates of aluminum oxide, glass substrates, semiconductor substrates of silicon, or the like may be used. Note that, when the base member  61  is a ceramics substrate, an alloy such as kovar having a coefficient of linear expansion approximating the ceramics substrate may be used for the lid  62 . 
     Further, internal electrodes  615 ,  616  are placed on a bottom surface of the recessed portion  611 . 
     The vibrator element  5  is placed so that the upper surface of the vibrator substrate  51  may face the bottom surface of the recessed portion  611 . The pad electrode  523  placed on the upper surface of the vibrator substrate  51  and the internal electrode  615  are bonded via a conductive adhesive  617 . That is, by the conductive adhesive  617 , the vibrator element  5  is fixed to the bottom surface of the recessed portion  611  and the pad electrode  523  and the internal electrode  615  are electrically coupled. The pad electrode  524  placed on the lower surface of the vibrator substrate  51  and the internal electrode  616  are electrically coupled via a conductive wire W 1 . 
     As shown in  FIGS.  2  and  4   , on the upper surface of the base member  61 , the first electrode terminal  63 , the second electrode terminal  64 , the third electrode terminal  65 , and the fourth electrode terminal  66  are placed. 
     As shown in  FIG.  4   , the first electrode terminal  63  is electrically coupled to the internal electrode  615  via an internal wire (not shown) provided within the base member  61 . That is, as shown in  FIGS.  4  and  5   , the first electrode terminal  63  is electrically coupled to the excitation electrode  521  via the internal electrode  615 , the pad electrode  523 , and the lead wire  525 . Further, as shown in  FIGS.  1  and  2   , the first electrode terminal  63  and the fifth coupling wire  215  placed on the upper surface of the base  2  are electrically coupled via a conductive wire W 2 . 
     As shown in  FIG.  4   , the second electrode terminal  64  is electrically coupled to the internal electrode  616  via an internal wire (not shown) provided within the base member  61 . That is, as shown in  FIGS.  4  and  5   , the second electrode terminal  64  is electrically coupled to the excitation electrode  522  via the internal electrode  616 , the pad electrode  524 , and the lead wire  526 . Further, as shown in  FIGS.  1  and  2   , the second electrode terminal  64  and the sixth coupling wire  216  placed on the upper surface of the base  2  are electrically coupled via a conductive wire W 3 . 
     The third electrode terminal  65  is a ground terminal for coupling to the ground potential. The third electrode terminal  65  is electrically coupled to the respective units of the vibrator  4 , e.g. the vibrator element  5  and the lid  62  via internal wires (not shown) provided within the base member  61 . Further, the third electrode terminal  65  and the first coupling wire  211  placed on the upper surface of the base  2  are electrically coupled via a conductive wire W 4 . Note that the third electrode terminal  65  may be a dummy terminal not electrically coupled to the respective units of the vibrator  4 . Alternatively, the third electrode terminal  65  may be omitted. 
     The wires W 2 , W 3 , W 4  are bonding wires formed using wire bonding. As the wires W 2 , W 3 , W 4 , e.g. gold wires, copper wires, aluminum wires, or the like may be used. 
     The fourth electrode terminal  66  is a dummy terminal not electrically coupled to the respective units of the vibrator  4 . In the embodiment, the fourth electrode terminal  66  as the dummy terminal electrically floats, however, may be coupled to the ground potential like the third electrode terminal  65 . Alternatively, the fourth electrode terminal  66  may be omitted. 
     As above, the base  2 , the semiconductor element  3 , and the vibrator  4  are explained. 
     Next, the first wires  101 ,  102 , the second wire  103 , and the shield wire  20  of the vibrator device  1  will be explained. 
     First, the first wires  101 ,  102  will be explained. 
     As shown in  FIGS.  1  and  2   , the first wires  101 ,  102  are wires electrically coupling between the excitation electrodes  521 ,  522  of the vibrator  4  and the semiconductor element  3 . That is, the first wires  101 ,  102  are a pair of drive wires for applying drive signals to the excitation electrodes  521 ,  522  and oscillating the vibrator  4 . Note that, as below, when the first wire  101  electrically coupling between the excitation electrode  521  and the semiconductor element  3  and the first wire  102  electrically coupling between the excitation electrode  522  and the semiconductor element  3  are distinguished, the first wire  101  electrically coupling between the excitation electrode  521  and the semiconductor element  3  is also referred to as “first drive wire  101 ” and the first wire  102  electrically coupling between the excitation electrode  522  and the semiconductor element  3  is also referred to as “second drive wire  102 ”. 
     In the embodiment, the first drive wire  101  has the first electrode terminal  63  placed on the upper surface of the vibrator  4 , the fifth coupling wire  215  placed on the upper surface of the base  2 , and the wire W 2  electrically coupling the first electrode terminal  63  and the fifth coupling wire  215 . The second drive wire  102  has the second electrode terminal  64  placed on the upper surface of the vibrator  4 , the sixth coupling wire  216  placed on the upper surface of the base  2 , and the wire W 3  electrically coupling the second electrode terminal  64  and the sixth coupling wire  216 . 
     The drive signals output from the fifth coupling terminal  325  and the sixth coupling terminal  326  formed on the lower surface of the semiconductor element  3  are applied to the excitation electrodes  521 ,  522  via the first drive wire  101  and the second drive wire  102 , respectively. Thereby, the vibrator  4  oscillates. 
     Next, the second wire  103  will be explained. 
     As shown in  FIGS.  1  and  3   , the second wire  103  is a wire electrically coupling between the second external terminal  222  as the external output terminal placed on the base  2  and the semiconductor element  3 . That is, the second wire  103  is the output wire for outputting the reference signal output from the semiconductor element  3  to the outside of the vibrator device  1 . 
     In the embodiment, the second wire  103  has the second external terminal  222 , the second coupling wire  212 , and the via  232  electrically coupling the second external terminal  222  and the second coupling wire  212 . The reference signal output from the second coupling terminal  322  placed on the lower surface of the semiconductor element  3  is output to the outside of the vibrator device  1  via the second wire  103  as the output wire. 
     Next, the shield wire  20  will be explained. 
     As shown in  FIGS.  1  and  2   , the shield wire  20  is a wire placed between the first wires  101 ,  102  and the second wire  103 . The shield wire  20  is placed between the first wires  101 ,  102  and the second wire  103 , and thereby, electric fields generated between the first wires  101 ,  102  and the second wire  103  are shielded by the shield wire  20 . That is, the shield wire  20  is placed between the first wires  101 ,  102  and the second wire  103 , and thereby, parasitic capacitances produced between the first wires  101 ,  102  for oscillating the vibrator  4  and the second wire  103  outputting the reference signal may be reduced. The parasitic capacitances produced between the first wires  101 ,  102  and the second wire  103  are reduced, and thereby, the difference between the parasitic capacitance between the first drive wire  101  and the second wire  103  and the parasitic capacitance between the second drive wire  102  and the second wire  103  may be reduced. Therefore, the fluctuations of the output frequency relative to the fluctuations of the power supply voltage are smaller and the vibrator device  1  with good frequency-power characteristics may be provided. 
     Next, the shield wire  20  will be explained in detail. 
     In the embodiment, the first coupling wire  211  placed on the upper surface of the base  2  functions as the shield wire  20 . Specifically, the first coupling wire  211  has the function as the shield wire  20  coupled to the ground potential in addition to the function of electrically coupling the first external terminal  221  as the ground terminal of the vibrator device  1  and the first coupling terminal  321  as the ground terminal of the semiconductor element  3 . 
     As shown in  FIGS.  2  and  3   , the first coupling wire  211  has a part overlapping with the vibrator  4  in the plan view. Of the first coupling wire  211 , the part overlapping with the vibrator  4  in the plan view has substantially the same shape as the vibrator  4 . Of the first coupling wire  211 , the part overlapping with the vibrator  4  in the plan view functions as the shield wire  20 . 
     As shown in  FIGS.  1  and  2   , in the embodiment, for example, the first coupling wire  211  as the shield wire  20  is placed between the fifth coupling wire  215  and sixth coupling wire  216  of the first wires  101 ,  102  and the second coupling wire  212  of the second wire  103 . Further, for example, the first coupling wire  211  as the shield wire  20  is placed between the wires W 2 , W 3  of the first wires  101 ,  102  and the second external terminal  222  of the second wire  103 . 
     That is, the first coupling wire  211  as the shield wire  20  is placed between at least a part of the first wires  101 ,  102  and at least a part of the second wire  103 . 
     In other words, there is a straight line passing all of the first wires  101 ,  102 , the first coupling wire  211  as the shield wire  20 , and the second wire  103 . Specifically, there is a straight line passing all of the first drive wire  101 , the shield wire  20 , and the second wire  103  or a straight line passing all of the second drive wire  102 , the shield wire  20 , and the second wire  103 . Alternatively, there may be both the straight line passing all of the first drive wire  101 , the shield wire  20 , and the second wire  103  and the straight line passing all of the second drive wire  102 , the shield wire  20 , and the second wire  103 . 
     As described above, the first coupling wire  211  as the shield wire  20  is placed between at least a part of the first wires  101 ,  102  and at least a part of the second wire  103 , and thereby, the difference between the parasitic capacitance between the first drive wire  101  and the second wire  103  and the parasitic capacitance between the second drive wire  102  and the second wire  103  may be reduced. Therefore, the fluctuations of the output frequency relative to the fluctuations of the power supply voltage are smaller and the vibrator device  1  with good frequency-power characteristics may be provided. 
     In the embodiment, the shield wire  20  is placed on the base  2 , however, the member on which the shield wire  20  is placed is not limited to the base  2 . The shield wire  20  may be placed between at least a part of the first wires  101 ,  102  and at least a part of the second wire  103  to shield at least a part of the electric fields generated between the first wires  101 ,  102  and the second wire  103 . For example, the shield wire  20  may be placed on the semiconductor element  3  or the vibrator  4 . 
     Further, in the embodiment, the shield wire  20  is placed on the upper surface as the surface facing the semiconductor element  3  in the base  2 , however, may be placed inside of the base  2 . 
     Furthermore, in the embodiment, the shield wire  20  is placed between a part of the first wires  101 ,  102  and a part of the second wire  103 , however, may be placed between the entire of the first wires  101 ,  102  and the entire of the second wire  103 . For example, the shield wires  20  are placed not only on the upper surface of the base  2  but also in a plurality of locations inside of the base  2  and on the semiconductor element  3 , and thereby, the shield wires  20  may be placed between the entire of the first wires  101 ,  102  and the entire of the second wire  103 . 
     As described above, the following effects may be obtained according to the embodiment. 
     The vibrator device  1  has the base  2 , the semiconductor element  3  having the oscillation circuit  33 , and the vibrator  4  having the excitation electrodes  521 ,  522  sequentially stacked, and includes the first wires  101 ,  102  electrically coupling between the excitation electrodes  521 ,  522  and the semiconductor element  3 , the second wire  103  electrically coupling between the second external terminal  222  as the external output terminal placed on the base  2  and the semiconductor element  3 , and the shield wire  20  placed between at least a part of the first wires  101 ,  102  and at least a part of the second wire  103 . 
     Thereby, the difference between the parasitic capacitance between the first drive wire  101  as one wire of the first wires  101 ,  102  for oscillating the vibrator  4  and the second wire  103  as the wire outputting the reference signal and the parasitic capacitance between the second drive wire  102  as the other wire of the first wires  101 ,  102  and the second wire  103  may be reduced. Therefore, the fluctuations of the output frequency relative to the fluctuations of the power supply voltage are smaller and the vibrator device  1  with good frequency-power characteristics may be provided. 
     2. Embodiment 2 
     Next, a vibrator device  1   a  according to embodiment 2 will be explained with reference to  FIG.  6   . 
     The vibrator device  1   a  of embodiment 2 is the same as that of embodiment 1 except that the semiconductor substrate  31  of the semiconductor element  3  is coupled to a ground potential and the semiconductor substrate  31  functions as a shield wire  20   a.  Note that the same configurations as those of embodiment 1 have the same signs and the overlapping explanation will be omitted. 
     In the embodiment, the semiconductor substrate  31  of the semiconductor element  3  is coupled to the ground potential. For example, the semiconductor substrate  31  and the first coupling terminal  321  as the ground terminal shown in  FIG.  2    are electrically coupled via an internal wire (not shown) provided within the circuit unit  32 , and thereby, the semiconductor substrate  31  may be coupled to the ground potential. The semiconductor substrate  31  coupled to the ground potential corresponds to a constant potential layer held at a constant potential. That is, the semiconductor element  3  has the semiconductor substrate  31  as the constant potential layer held at the constant potential. 
     As shown in  FIG.  6   , the semiconductor substrate  31  as the constant potential layer may function as the shield wire  20   a.    
     In the embodiment, for example, the semiconductor substrate  31  as the shield wire  20   a  is placed between the first electrode terminal  63  and second electrode terminal  64  of the first wires  101 ,  102  and the second coupling wire  212  of the second wire  103 . 
     As described above, the semiconductor substrate  31  as the shield wire  20   a  is placed between at least a part of the first wires  101 ,  102  and at least a part of the second wire  103 , and thereby, the difference between the parasitic capacitance between the first drive wire  101  and the second wire  103  and the parasitic capacitance between the second drive wire  102  and the second wire  103  may be reduced. Therefore, the fluctuations of the output frequency relative to the fluctuations of the power supply voltage are smaller and the vibrator device  1   a  with good frequency-power characteristics may be provided. 
     In the embodiment, the semiconductor substrate  31  coupled to the ground potential is the constant potential layer as the shield wire  20   a,  however, the constant potential layer of the semiconductor element  3  is not necessarily the semiconductor substrate  31 . For example, a conductive layer coupled to the ground potential may be placed on the upper surface, the lower surface, or inside of the semiconductor element  3  and the conductive layer may be used as the constant potential layer as the shield wire  20   a.    
     Further, in the embodiment, the vibrator device la has the shield wire  20  in addition to the shield wire  20   a,  however, the shield wire  20  may be omitted. 
     As described above, according to the embodiment, the semiconductor substrate  31  as the constant potential layer held at the constant potential is placed as the shield wire  20   a  between at least a part of the first wires  101 ,  102  and at least a part of the second wire  103 , and thereby, the same effects as those of embodiment 1 may be obtained. 
     3. Embodiment 3 
     Next, a vibrator device  1   b  according to embodiment 3 will be explained with reference to  FIG.  7   . 
     The vibrator device  1   b  of embodiment 3 is the same as that of embodiment 1 except that the lid  62  functions as a shield wire  20   b.  Note that the same configurations as those of embodiment 1 have the same signs and the overlapping explanation will be omitted. 
     In the embodiment, the lid  62  of the vibrator  4  is formed using a conductive material. For example, the lid  62  is formed using an alloy such as kovar. 
     As shown in  FIG.  7   , the lid  62  formed using the conductive material may function as the shield wire  20   b.    
     In the embodiment, for example, the lid  62  as the shield wire  20   b  is placed between the first electrode terminal  63  and second electrode terminal  64  of the first wires  101 ,  102  and the second coupling wire  212  of the second wire  103 . 
     As described above, the lid  62  as the shield wire  20   b  is placed between at least a part of the first wires  101 ,  102  and at least a part of the second wire  103 , and thereby, the difference between the parasitic capacitance between the first drive wire  101  and the second wire  103  and the parasitic capacitance between the second drive wire  102  and the second wire  103  may be reduced. Therefore, the fluctuations of the output frequency relative to the fluctuations of the power supply voltage are smaller and the vibrator device  1   b  with good frequency-power characteristics may be provided. 
     The lid  62  as the shield wire  20   b  may electrically float or may be coupled to the ground potential. The lid  62  is coupled to the ground potential, and thereby, compared to a case where the lid  62  electrically floats, the difference between the parasitic capacitance between the first drive wire  101  and the second wire  103  and the parasitic capacitance between the second drive wire  102  and the second wire  103  may be further reduced. 
     Here, an example of the configuration in which the lid  62  as the shield wire  20   b  is coupled to the ground potential is explained. 
     For example, the adhesive D 1  bonding the upper surface of the semiconductor element  3  and the lower surface of the lid  62  may be a conductive adhesive. The conductive adhesive is used as the adhesive D 1 , and thereby, the lid  62  is electrically coupled to the semiconductor substrate  31  of the semiconductor element  3  via the adhesive D 1 . Accordingly, the semiconductor substrate  31  is coupled to the ground potential, and thereby, the lid  62  as the shield wire  20   b  may be coupled to the ground potential. 
     Note that the configuration in which the lid  62  as the shield wire  20   b  is coupled to the ground potential is not limited to the above described configuration. For example, the third electrode terminal  65  as the ground terminal placed on the upper surface of the vibrator  4  and the lid  62  may be electrically coupled via an internal wire (not shown) within the base member  61 . 
     Further, in the embodiment, the vibrator device  1   b  has the shield wire  20  in addition to the shield wire  20   b,  however, the shield wire  20  may be omitted. 
     As described above, according to the embodiment, the lid  62  is placed as the shield wire  20   b  between at least a part of the first wires  101 ,  102  and at least a part of the second wire  103 , and thereby, the same effects as those of embodiment 1 may be obtained. 
     4. Embodiment 4 
     Next, a vibrator device  1   c  according to embodiment 4 will be explained with reference to  FIGS.  8  to  12   . Note that the mold portion M is omitted in  FIG.  11    for convenience of explanation. 
     The vibrator device  1   c  of embodiment 4 is the same as that of embodiment 1 except that a base  2   c  is a multilayer substrate and a shield wire  20   c  is placed between layers of the multilayer substrate. Note that the same configurations as those of embodiment 1 have the same signs and the overlapping explanation will be omitted. 
     As shown in  FIG.  8   , the base  2   c  is the multilayer substrate in which a plurality of substrates are stacked. In the embodiment, the base  2   c  is the multilayer substrate in which a first base substrate  201  and a second base substrate  202  are stacked. The second base substrate  202  is placed on an upper surface of the first base substrate  201 . An upper surface of the second base substrate  202  is an upper surface of the base  2   c.  A lower surface of the first base substrate  20  is a lower surface of the base  2   c.    
     In the embodiment, the base  2   c  is the multilayer substrate in which two substrates of the first base substrate  201  and the second base substrate  202  are stacked, however, the base  2   c  may be a multilayer substrate in which three or more substrates are stacked. 
     First, wires placed between the layers of the first base substrate  201  and the second base substrate  202  will be explained. 
     As shown in  FIGS.  9  and  10   , a seventh coupling wire  241 , an eighth coupling wire  242 , a ninth coupling wire  243 , a tenth coupling wire  244 , an eleventh coupling wire  245 , and a twelfth coupling wire  246  are placed between the layers of the first base substrate  201  and the second base substrate  202 . The seventh coupling wire  241  is coupled to a ground potential and may function as the shield wire  20   c  as will be described later. 
     Note that, in  FIG.  9   , for convenience of explanation, the seventh coupling wire  241 , the eighth coupling wire  242 , the ninth coupling wire  243 , the tenth coupling wire  244 , the eleventh coupling wire  245 , and the twelfth coupling wire  246  placed between the layers of the first base substrate  201  and the second base substrate  202  are shown to be placed on the upper surface of the first base substrate  201 . 
     Next, the first base substrate  201  will be explained. 
     As shown in  FIG.  9   , the first external terminal  221 , the second external terminal  222 , the third external terminal  223 , and the fourth external terminal  224  are placed on the lower surface of the first base substrate  201 . 
     In the first base substrate  201 , a plurality of vias  231   c,    232   c,    233   c,    234   c  penetrating between the upper surface and the lower surface of the first base substrate  201  are provided. The vias  231   c,    232   c,    233   c,    234   c  are respectively through electrodes formed by filling of through holes penetrating the first base substrate  201  with conductors. 
     The seventh coupling wire  241  and the first external terminal  221  are electrically coupled via the via  231   c.  The eighth coupling wire  242  and the second external terminal  222  are electrically coupled via the via  232   c.  The ninth coupling wire  243  and the third external terminal  223  are electrically coupled via the via  233   c.  The tenth coupling wire  244  and the fourth external terminal  224  are electrically coupled via the via  234   c.    
     Next, the second base substrate  202  will be explained. 
     As shown in  FIGS.  10  and  11   , on the upper surface of the second base substrate  202 , the first coupling wire  211 , the second coupling wire  212 , the third coupling wire  213 , the fourth coupling wire  214 , the fifth coupling wire  215 , and the sixth coupling wire  216  are placed. 
     In the second base substrate  202 , a plurality of vias  231   d,    232   d,    233   d,    234   d,    235 ,  236  penetrating between the upper surface and the lower surface of the second base substrate  202  are provided. The vias  231   d,    232   d,    233   d,    234   d,    235 ,  236  are respectively through electrodes formed by filling of through holes penetrating the second base substrate  202  with conductors. 
     The first coupling wire  211  and the seventh coupling wire  241  are electrically coupled via the via  231   d.  The second coupling wire  212  and the eighth coupling wire  242  are electrically coupled via the via  232   d.  The third coupling wire  213  and the ninth coupling wire  243  are electrically coupled via the via  233   d.  The fourth coupling wire  214  and the tenth coupling wire  244  are electrically coupled via the via  234   d.    
     Further, the fifth coupling wire  215  and the eleventh coupling wire  245  are electrically coupled via the via  235 . The sixth coupling wire  216  and the twelfth coupling wire  246  are electrically coupled via the via  236 . 
     Next, first wires  101   c,    102   c,  a second wire  103   c,  and the shield wire  20   c  of the vibrator device  1   c  will be explained. 
     First, the first wires  101   c,    102   c  will be explained. 
     As shown in  FIGS.  8  and  11   , in the embodiment, of the first wires  101   c,    102   c,  the first drive wire  101   c  has the first electrode terminal  63  placed on the upper surface of the vibrator  4 , the fifth coupling wire  215  placed on the upper surface of the base  2   c,  the wire W 2  electrically coupling the first electrode terminal  63  and the fifth coupling wire  215 , the eleventh coupling wire  245  placed between the layers of the first base substrate  201  and the second base substrate  202 , and the via  235  electrically coupling the fifth coupling wire  215  and the eleventh coupling wire  245 . Of the first wires  101   c,    102   c,  the second drive wire  102   c  has the second electrode terminal  64  placed on the upper surface of the vibrator  4 , the sixth coupling wire  216  placed on the upper surface of the base  2   c,  the wire W 3  electrically coupling the second electrode terminal  64  and the sixth coupling wire  216 , the twelfth coupling wire  246  placed between the layers of the first base substrate  201  and the second base substrate  202 , and the via  236  electrically coupling the sixth coupling wire  216  and the twelfth coupling wire  246 . 
     Next, the second wire  103   c  will be explained. 
     As shown in  FIGS.  8  and  11   , in the embodiment, the second wire  103   c  has the second external terminal  222  placed on the lower surface of the base  2   c,  the eighth coupling wire  242  placed between the layers of the first base substrate  201  and the second base substrate  202 , the via  232   c  electrically coupling the second external terminal  222  and the eighth coupling wire  242 , the second coupling wire  212  placed on the upper surface of the base  2   c,  and the via  232   d  electrically coupling the second coupling wire  212  and the eighth coupling wire  242 . 
     Next, the shield wire  20   c  will be explained. In the embodiment, the seventh coupling wire  241  placed between the layers of the first base substrate  201  and the second base substrate  202  has a function as the shield wire  20   c  coupled to the ground potential in addition to the function of electrically coupling the first external terminal  221  as the ground terminal of the vibrator device  1   c  and the first coupling wire  211  placed on the upper surface of the base  2   c.    
     As shown in  FIGS.  9  and  10   , in the embodiment, the seventh coupling wire  241  as the shield wire  20   c  has a first partial wire  241   c  extending in the X directions and a second partial wire  241   d  extending in the Y directions. The second partial wire  241   d  has an area overlapping with the first coupling wire  211  as the shield wire  20  in the plan view. 
     As shown in  FIGS.  8  and  9   , in the embodiment, for example, the seventh coupling wire  241  as the shield wire  20   c  is placed between the eleventh coupling wire  245  and twelfth coupling wire  246  of the first wires  101   c,    102   c  and the eighth coupling wire  242  of the second wire  103   c.    
     In other words, the seventh coupling wire  241  as the shield wire  20   c  is placed between at least a part of the first wires  101   c,    102   c  and at least a part of the second wire  103   c.    
     As described above, the seventh coupling wire  241  as the shield wire  20   c  is placed between at least a part of the first wires  101   c,    102   c  and at least a part of the second wire  103   c,  and thereby, the difference between the parasitic capacitance between the first drive wire  101   c  and the second wire  103   c  and the parasitic capacitance between the second drive wire  102   c  and the second wire  103   c  may be reduced. Therefore, the fluctuations of the output frequency relative to the fluctuations of the power supply voltage are smaller and the vibrator device  1   c  with good frequency-power characteristics may be provided. 
     Note that, in the embodiment, the vibrator device  1   c  has the shield wire  20  in addition to the shield wire  20   c,  however, the shield wire  20  may be omitted. 
     Further, as shown in  FIG.  9   , in the embodiment, in the plan view, the first partial wire  241   c  of the seventh coupling wire  241  as the shield wire  20   c  placed between the layers of the first base substrate  201  and the second base substrate  202  is placed at the plus side in the Y direction with respect to the eighth coupling wire  242  as the second wire  103   c  placed between the layers of the first base substrate  201  and the second base substrate  202 . Further, the second partial wire  241   d  of the seventh coupling wire  241  as the shield wire  20   c  is placed at the minus side in the X direction with respect to the eighth coupling wire  242 . That is, the seventh coupling wire  241  as the shield wire  20   c  has the first partial wire  241   c  placed at the plus side in the Y direction with respect to the eighth coupling wire  242  and the second partial wire  241   d  placed at the minus side in the X direction with respect to the eighth coupling wire  242  in the plan view. 
     In other words, the seventh coupling wire  241  as the shield wire  20   c  placed between the layers of the first base substrate  201  and the second base substrate  202  is placed in two directions of the X direction as the first direction and the Y direction as the second direction crossing the X direction with respect to the eighth coupling wire  242  as the second wire  103   c  placed between the layers of the first base substrate  201  and the second base substrate  202  in the plan view. 
     As described above, the seventh coupling wire  241  as the shield wire  20   c  is placed in the X direction and the Y direction with respect to the eighth coupling wire  242  in the plan view, and thereby, the difference between the parasitic capacitance between the first drive wire  101   c  and the second wire  103   c  and the parasitic capacitance between the second drive wire  102   c  and the second wire  103   c  may be further reduced. 
     Further, as shown in  FIGS.  9  and  10   , in the embodiment, the first partial wire  241   c  extending in the X directions of the seventh coupling wire  241  as the shield wire  20   c  extends to a side surface of the base  2   c  at the plus side in the X direction. The second partial wire  241   d  extending in the Y directions of the seventh coupling wire  241  as the shield wire  20   c  extends to a side surface of the base  2   c  at the minus side in the Y direction. 
     As described above, the seventh coupling wire  241  as the shield wire  20   c  is extended to the side surfaces of the base  2   c,  and thereby, the difference between the parasitic capacitance between the first drive wire  101   c  and the second wire  103   c  and the parasitic capacitance between the second drive wire  102   c  and the second wire  103   c  may be further reduced. 
     Furthermore, as shown in  FIGS.  10  and  12   , in the embodiment, in the second base substrate  202 , vias  237  penetrating between the upper surface and the lower surface of the second base substrate  202  are provided. The vias  237  are through electrodes formed by filling of through holes penetrating the second base substrate  202  with conductors. 
     The vias  237  are placed in positions overlapping with the seventh coupling wire  241  as the shield wire  20   c  in the plan view. The vias  237  are bonded to the seventh coupling wire  241  and electrically coupled to the seventh coupling wire  241 . That is, the vias  237  are electrically coupled to the seventh coupling wire  241  as the shield wire  20   c,  and thereby, function as the shield wire  20   c.    
     As described above, the vias  237  electrically coupled to the seventh coupling wire  241  as the shield wire  20   c  placed between the layers of the first base substrate  201  and the second base substrate  202  are provided, and thereby, the difference between the parasitic capacitance between the first drive wire  101   c  and the second wire  103   c  and the parasitic capacitance between the second drive wire  102   c  and the second wire  103   c  may be further reduced. 
     Further, in the embodiment, the vias  237  are placed in positions overlapping with the first coupling wire  211  as the shield wire  20  in the plan view. The vias  237  are bonded to the first coupling wire  211  and electrically coupled to the first coupling wire  211 . That is, the first coupling wire  211  and the seventh coupling wire  241  are electrically coupled via the vias  237 . 
     As described above, the first coupling wire  211  as the shield wire  20  and the seventh coupling wire  241  as the shield wire  20   c  are electrically coupled via the vias  237 , and thereby, the difference between the parasitic capacitance between the first drive wire  101   c  and the second wire  103   c  and the parasitic capacitance between the second drive wire  102   c  and the second wire  103   c  may be further reduced. 
     Note that, in the embodiment, the vias  237  are electrically coupled to the first coupling wire  211  as the shield wire  20 , however, not necessarily electrically coupled to the first coupling wire  211 . Further, in the embodiment, the vias  237  are provided in the second base substrate  202 , however, may be provided in the first base substrate  201 . Furthermore, in the embodiment, the four vias  237  are provided, however, the vias  237  are not necessarily provided. When the vias  237  are provided, the number of the vias  237  may be any number equal to or larger than one. 
     As described above, according to the embodiment, the base  2   c  is the multilayer substrate having the first base substrate  201  and the second base substrate  202  and the seventh coupling wire  241  as the shield wire  20   c  is placed between the layers of the first base substrate  201  and the second base substrate  202 , and thereby, the same effects as those of embodiment 1 may be obtained. 
     5. Embodiment 5 
     Next, a vibrator device  1   d  according to embodiment 5 will be explained with reference to  FIGS.  13  to  15   . Note that the mold portion M is omitted in  FIG.  14    for convenience of explanation. 
     The vibrator device  1   d  of embodiment 5 is the same as that of embodiment 1 except that the semiconductor element  3  is placed upside down and the semiconductor element  3  and the base  2  are electrically coupled using wire bonding. Note that the same configurations as those of embodiment 1 have the same signs and the overlapping explanation will be omitted. 
     As shown in  FIG.  13   , in the embodiment, the semiconductor element  3  is placed upside down compared to that in embodiment 1. Specifically, in the embodiment, the circuit unit  32  is placed on the upper surface of the semiconductor substrate  31 . The upper surface of the semiconductor element  3  is the upper surface of the circuit unit  32  and the lower surface of the semiconductor element  3  is the lower surface of the semiconductor substrate  31 . 
     The upper surface of the semiconductor element  3  and the lower surface of the vibrator  4  are bonded via the adhesive D 1 . 
     The lower surface of the semiconductor element  3  and the upper surface of the base  2  are bonded via an adhesive D 2 . Specifically, the lower surface of the semiconductor element  3  and the first coupling wire  211  as a shield wire  20   d  placed on the upper surface of the base  2  are bonded via the adhesive D 2 . The shield wire  20   d  will be described later. 
     As shown in  FIGS.  13  and  14   , the first coupling terminal  321 , the second coupling terminal  322 , the third coupling terminal  323 , the fourth coupling terminal  324 , the fifth coupling terminal  325 , and the sixth coupling terminal  326  are placed on the upper surface of the semiconductor element  3 . 
     As shown in  FIGS.  14  and  15   , the first coupling wire  211 , the second coupling wire  212 , the third coupling wire  213 , and the fourth coupling wire  214  are placed on the upper surface of the base  2 . 
     As shown in  FIGS.  13  and  14   , the first coupling terminal  321  and the first coupling wire  211  are electrically coupled via the conductive wire W 4 . The second coupling terminal  322  and the second coupling wire  212  are electrically coupled via a conductive wire W 5 . The third coupling terminal  323  and the third coupling wire  213  are electrically coupled via a conductive wire W 6 . The fourth coupling terminal  324  and the fourth coupling wire  214  are electrically coupled via a conductive wire W 7 . 
     Further, the fifth coupling terminal  325  placed on the upper surface of the semiconductor element  3  and the first electrode terminal  63  placed on the upper surface of the vibrator  4  are electrically coupled via a conductive wire W 8 . The sixth coupling terminal  326  placed on the upper surface of the semiconductor element  3  and the second electrode terminal  64  placed on the upper surface of the vibrator  4  are electrically coupled via a conductive wire W 9 . 
     Furthermore, the first coupling terminal  321  placed on the upper surface of the semiconductor element  3  and the third electrode terminal  65  placed on the upper surface of the vibrator  4  are electrically coupled via a conductive wire W 10 . 
     Next, first wires  101   d,    102   d,  a second wire  103   d,  and the shield wire  20   d  of the vibrator device  1   d  will be explained. 
     First, the first wires  101   d,    102   d  will be explained. 
     As shown in  FIGS.  13  and  14   , in the embodiment, of the first wires  101   d,    102   d,  the first drive wire  101   d  has the first electrode terminal  63  placed on the upper surface of the vibrator  4  and the wire W 8  electrically coupling the first electrode terminal  63  and the fifth coupling wire  325  placed on the upper surface of the semiconductor element  3 . Of the first wires  101   d,    102   d,  the second drive wire  102   d  has the second electrode terminal  64  placed on the upper surface of the vibrator  4  and the wire W 9  electrically coupling the second electrode terminal  64  and the sixth coupling wire  326  placed on the upper surface of the semiconductor element  3 . 
     Next, the second wire  103   d  will be explained. 
     As shown in  FIGS.  13  and  14   , in the embodiment, the second wire  103   d  has the second external terminal  222  placed on the lower surface of the base  2 , the second coupling wire  212  placed on the upper surface of the base  2 , the via  232  electrically coupling the second external terminal  222  and the second coupling wire  212 , and the wire W 5  electrically coupling the second coupling wire  212  and the second coupling terminal  322  placed on the upper surface of the semiconductor element  3 . 
     Next, the shield wire  20   d  will be explained. 
     In the embodiment, the first coupling wire  211  placed on the upper surface of the base  2  functions as the shield wire  20   d.    
     As shown in  FIGS.  14  and  15   , the first coupling wire  211  has an area overlapping with the semiconductor element  3  in the plan view. The area has substantially the same shape as the semiconductor element  3  in the plan view. Of the first coupling wire  211 , a part overlapping with the semiconductor element  3  in the plan view functions as the shield wire  20   d.    
     As shown in  FIG.  13   , in the embodiment, for example, the first coupling wire  211  as the shield wire  20   d  is placed between the first electrode terminal  63  and second electrode terminal  64  of the first wires  101   d,    102   d  and the second external terminal  222  of the second wire  103   d.  Further, for example, the first coupling wire  211  as the shield wire  20   d  is placed between the wires W 8 , W 9  of the first wires  101   d,    102   d  and the second external terminal  222  of the second wire  103   d.    
     In other words, the first coupling wire  211  as the shield wire  20   d  is placed between at least a part of the first wires  101   d,    102   d  and at least a part of the second wire  103   d.    
     As described above, the first coupling wire  211  as the shield wire  20   d  is placed between at least a part of the first wires  101   d,    102   d  and at least a part of the second wire  103   d,  and thereby, the difference between the parasitic capacitance between the first drive wire  101   d  and the second wire  103   d  and the parasitic capacitance between the second drive wire  102   d  and the second wire  103   d  may be reduced. Therefore, the fluctuations of the output frequency relative to the fluctuations of the power supply voltage are smaller and the vibrator device  1   d  with good frequency-power characteristics may be provided. 
     As described above, according to the embodiment, even when the semiconductor element  3  and the base  2  are electrically coupled using wire bonding, the first coupling wire  211  as the shield wire  20   d  is placed between the first wires  101   d,    102   d  and the second wire  103   d,  and thereby, the same effects as those of embodiment 1 may be obtained. 
     As above, the vibrator devices  1  to  1   d  are explained based on embodiments 1 to 5. Note that the present disclosure is not limited to those, but the configurations of the respective parts may be replaced by any configurations having the same functions. Further, any other configuration may be added to the present disclosure. Furthermore, the respective embodiments may be appropriately combined. 
     For example, the configuration of embodiment 4 may be applied to embodiments 1 to 3. 
     Further, for example, the shield wires  20  to  20   d  are coupled to the ground potential, however, not necessarily coupled to the ground potential. The shield wires  20  to  20   d  may be held at a constant potential fixed to another constant potential than the ground potential.