Patent Publication Number: US-2023155568-A1

Title: Vibrator device

Description:
The present application is based on, and claims priority from JP Application Serial Number 2021-187670, 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 oscillating the piezoelectric vibrator are placed in upward and downward directions of a substrate and the substrate and the IC chip are electrically coupled by wire bonding is known. In the configuration, generally, bonding between the substrate and the IC chip is bonding using an adhesive. 
     Further, in the configuration, to secure bonding quality, the adhesive is generally applied to a position overlapping with a pad provided on the IC chip in a plan view. As shown in JP-A-2006-67552, the pad provided on the IC chip is provided in an end portion of an upper surface of the IC chip. That is, the adhesive is applied to an end portion on a lower surface of the IC chip. 
     In the piezoelectric oscillator disclosed in JP-A-2006-67552, the adhesive may run over from the end portion of the IC chip bonded to the substrate. When the distance between the end portion of the IC chip and the pad provided on the substrate is short, the pad provided on the substrate is contaminated by the run-over adhesive. When the pad is contaminated, it is hard to bond a wire to the pad. Accordingly, it is necessary to set the distance between the end portion of the IC chip bonded to the substrate and the pad provided on the substrate to be sufficiently long. However, there is a problem that, when the distance between the end portion of the IC chip and the pad is set to be longer, further downsizing of the piezoelectric oscillator is harder. 
     SUMMARY 
     A vibrator device is a vibrator device including a base, a semiconductor element flip-chip mounted on the base, a vibrator mounted on the semiconductor element via an adhesive, a first coupling wire formed on the base, a first bump electrically coupling the semiconductor element and the first coupling wire, a first wire electrically coupling the first coupling wire and the vibrator, and a mold portion placed on the base and covering the semiconductor element and the vibrator. 
     A vibrator device is a vibrator device including a base, a semiconductor element flip-chip mounted on the base, a vibrator mounted on the semiconductor element via an adhesive, a first bump electrically coupling the semiconductor element and the base, a first wire electrically coupling the base and the vibrator, and a mold portion placed on the base and covering the semiconductor element and the vibrator. 
    
    
     
       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 3. 
         FIG.  7    is a plan view of the vibrator device according to embodiment 3. 
         FIG.  8    is a plan view of a base according to embodiment 3. 
     
    
    
     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. 
     First, a schematic configuration of the vibrator device  1  will be explained, and then, respective units including a base  2 , a semiconductor element  3 , and a vibrator  4  of the vibrator device  1  will be explained. 
     The schematic configuration of the vibrator device  1  is explained. 
     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 . The semiconductor element  3  and the vibrator  4  are covered by a mold portion M placed on the base  2 . Note that, in  FIG.  2   , the mold portion M is omitted for convenience of explanation. 
     Further, the vibrator device  1  has a first drive wire  101 , a second drive wire  102 , and an external output wire  103 . The first drive wire  101  and the second drive wire  102  are a pair of drive wires for applying drive signals output from the semiconductor element  3  to the vibrator  4  and oscillating the vibrator  4 . The external output wire  103  is an output wire for outputting a reference signal such as a clock signal output from the semiconductor element  3  to the outside of the vibrator device  1 . 
     A plurality of coupling wires are formed on the base  2 . Specifically, 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  are formed as the plurality of coupling wires. 
     The semiconductor element  3  is flip-chip mounted on the upper surface of the base  2 . 
     That is, a plurality of coupling terminals are formed on the lower surface of the semiconductor element  3 . Further, the plurality of coupling terminals formed on the lower surface of the semiconductor element  3  and the plurality of coupling wires formed on the upper surface of the base  2  are electrically and mechanically coupled via bumps. 
     Specifically, on the lower surface of the semiconductor element  3 , a first coupling terminal  321 , a 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 formed. Further, the first coupling terminal  321  and the first coupling wire  211  are electrically and mechanically coupled via a first bump B 1 . Similarly, 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  and 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 electrically and mechanically coupled via a second bump B 2 , a third bump B 3 , a fourth bump B 4 , a fifth bump B 5 , and a sixth bump B 6 , respectively. 
     The first bump B 1 , the second bump B 2 , the third bump B 3 , the fourth bump B 4 , the fifth bump B 5 , and the sixth bump B 6  are not particularly limited as long as the bumps have conductivity and bondability. For example, metal bumps such as gold bumps, silver bumps, copper bumps, or solder bumps may be used. 
     The vibrator  4  is mounted on an upper surface of the semiconductor element  3  via an adhesive D 1 . 
     A plurality of electrode terminals are formed on an upper surface of the vibrator  4 . Specifically, on the upper surface of the vibrator  4 , a first electrode terminal  63 , a second electrode terminal  64 , a third electrode terminal  65 , and a fourth electrode terminal  66  are formed. 
     The base  2  and the vibrator  4  are electrically coupled by wire bonding. Specifically, the first coupling wire  211  formed on the upper surface of the base  2  and the first electrode terminal  63  formed on the upper surface of the vibrator  4  are electrically coupled via a conductive first wire W 1 . Similarly, the second coupling wire  212  and fourth coupling wire  214  and the second electrode terminal  64  and third electrode terminal  65  are electrically coupled via conductive second wire W 2  and third wire W 3 , respectively. The first wire W 1 , the second wire W 2 , and the third wire W 3  are not particularly limited as long as the wires have conductivity and bondability. For example, gold wires, copper wires, aluminum wires, or the like may be used. 
     Here, the first coupling wire  211 , the second coupling wire  212 , and the fourth coupling wire  214  coupled to the first wire W 1 , the second wire W 2 , and the third wire W 3 , respectively, will be explained. 
     First, the first coupling wire  211  will be explained. 
     The first coupling wire  211  has a first coupling electrode E 1  bonded to the first wire W 1  and a second coupling electrode E 2  bonded to the first coupling terminal  321  of the semiconductor element  3  via the first bump B 1 . In the embodiment, the first coupling electrode E 1  is a part of the first coupling wire  211  not overlapping with the semiconductor element  3  in the plan view. The second coupling electrode E 2  is a part of the first coupling wire  211  overlapping with the semiconductor element  3  in the plan view. In the embodiment, the first coupling electrode E 1  and the second coupling electrode E 2  are adjacently placed. The boundary between the first coupling electrode E 1  and the second coupling electrode E 2  overlaps with an end portion of the semiconductor element  3  in the plan view. 
     Note that “adjacently” in the present disclosure means “next to each other”. 
     In a case where the base  2  and the semiconductor element  3  are bonded via an adhesive as in related art, deformation of the adhesive when the base  2  and the semiconductor element  3  are bonded is large and the adhesive may run over from the end portion of the semiconductor element  3 . On the other hand, in the embodiment, deformation of the first bump B 1  when the base  2  and the semiconductor element  3  are bonded is smaller than that of the adhesive. Accordingly, running over of the first bump B 1  from the end portion of the semiconductor element  3  may be suppressed. Therefore, the first coupling electrode E 1  bonded to the first wire W 1  may be placed near the end portion of the semiconductor element  3 . For example, the first coupling electrode E 1  may be placed adjacent to the end portion of the semiconductor element  3  in the plan view like the embodiment. 
     As described above, the distance between the end portion of the semiconductor element  3  bonded to the base  2  and the first coupling electrode E 1  provided on the base  2  may be made shorter, and further downsizing of the vibrator device  1  may be realized. 
     Next, the second coupling wire  212  will be explained. 
     The second coupling wire  212  has a third coupling electrode E 3  bonded to the second wire W 2  and a fourth coupling electrode E 4  bonded to the second coupling terminal  322  of the semiconductor element  3  via the second bump B 2 . In the embodiment, the third coupling electrode E 3  is a part of the second coupling wire  212  not overlapping with the semiconductor element  3  in the plan view. The fourth coupling electrode E 4  is a part of the second coupling wire  212  overlapping with the semiconductor element  3  in the plan view. In the embodiment, the third coupling electrode E 3  and the fourth coupling electrode E 4  are adjacently placed. The boundary between the third coupling electrode E 3  and the fourth coupling electrode E 4  overlaps with an end portion of the semiconductor element  3  in the plan view. 
     Deformation of the second bump B 2  when the base  2  and the semiconductor element  3  are bonded is smaller than that of the adhesive, and the third coupling electrode E 3  bonded to the second wire W 2  may be placed near the end portion of the semiconductor element  3 . For example, the third coupling electrode E 3  may be placed adjacent to the end portion of the semiconductor element  3  in the plan view like the embodiment. 
     Next, the fourth coupling wire  214  will be explained. 
     The fourth coupling wire  214  has a fifth coupling electrode E 5  bonded to the third wire W 3  and a sixth coupling electrode E 6  bonded to the fourth coupling terminal  324  of the semiconductor element  3  via the fourth bump B 4 . In the embodiment, the fifth coupling electrode E 5  is a part of the fourth coupling wire  214  not overlapping with the semiconductor element  3  in the plan view. The sixth coupling electrode E 6  is a part of the fourth coupling wire  214  overlapping with the semiconductor element  3  in the plan view. In the embodiment, the fifth coupling electrode E 5  and the sixth coupling electrode E 6  are adjacently placed. The boundary between the fifth coupling electrode E 5  and the sixth coupling electrode E 6  overlaps with an end portion of the semiconductor element  3  in the plan view. 
     Deformation of the fourth bump B 4  when the base  2  and the semiconductor element  3  are bonded is smaller than that of the adhesive, and the fifth coupling electrode E 5  may be placed near the end portion of the semiconductor element  3 . For example, the fifth coupling electrode E 5  may be placed adjacent to the end portion of the semiconductor element  3  in the plan view like the embodiment. 
     As described above, in the embodiment, the third coupling electrode E 3  of the second coupling wire  212  and the fifth coupling electrode E 5  of the fourth coupling wire  214  may be placed near the end portions of the semiconductor element  3  like the first coupling electrode E 1  of the first coupling wire  211 . Therefore, as long as the effect that further downsizing of the vibrator device  1  may be realized is exerted, the second coupling wire  212 , the third coupling electrode E 3 , the fourth coupling electrode E 4 , the second bump B 2 , and the second wire W 2  may be read as the first coupling wire  211 , the first coupling electrode E 1 , the second coupling electrode E 2 , the first bump B 1 , and the first wire W 1 , respectively. Similarly, the fourth coupling wire  214 , the fifth coupling electrode E 5 , the sixth coupling electrode E 6 , the fourth bump B 4 , and the third wire W 3  may be read as the first coupling wire  211 , the first coupling electrode E 1 , the second coupling electrode E 2 , the first bump B 1 , and the first wire W 1 , respectively. 
     As above, the schematic configuration of the vibrator device  1  will be explained. 
     Next, the respective units of the base  2 , the semiconductor element  3 , and the vibrator  4  of the vibrator device  1  will be explained. 
     First, the base  2  will be explained. 
     As shown in  FIGS.  2  and  3   , in the embodiment, the base  2  is in a plate shape formed to have a substantially rectangular planar shape. The base  2  has the upper surface as a surface facing the semiconductor element  3  in the base  2  and the lower surface having a front-back relation to the upper 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 . 
     Note that “substantially rectangular shape” in the present disclosure includes e.g. a square, an oblong, a parallelogram, a trapezoid, and other quadrangles and further includes shapes that may be regarded as being equal to quadrangles in addition to the shapes conforming with the quadrangles. The shapes that may be regarded as being equal to quadrangles include e.g. a shape having at least one corner portion convexly or concavely curved, a shape having at least one corner portion cut off, and a shape having an entire or a part of at least one side curved or bent in a quadrangle. 
     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 formed. 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 an external output terminal for outputting a reference signal such as a clock signal. The second external terminal  222  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 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 first external terminal  221 . 
     Note that, in the embodiment, the four external terminals of the first external terminal  221 , the second external terminal  222 , the third external terminal  223 , and the fourth external terminal  224  are formed, however, the number of the external terminals is not particularly limited. The number of external terminals may be appropriately set according to the configuration of the vibrator device  1 . 
     The first external terminal  221  is placed in a corner at the plus side in the X direction and the minus side in the Y direction. The second external terminal  222  is placed in a corner at the plus side in the X direction and the plus side in the Y direction. 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. 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. 
     Note that, in the embodiment, the first external terminal  221 , the second external terminal  222 , the third external terminal  223 , and the fourth external terminal  224  are placed as described above, however, the placement of the external terminals is not particularly limited, but may be appropriately set according to the configuration of the vibrator device  1 . 
     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 , 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  respectively electrically coupled to the semiconductor element  3  are formed. 
     As described above, the first coupling wire  211  is electrically coupled to the first coupling terminal  321  of the semiconductor element  3  via the first bump B 1  and electrically coupled to the first electrode terminal  63  of the vibrator  4  via the first wire W 1 . 
     As described above, the second coupling wire  212  is electrically coupled to the second coupling terminal  322  of the semiconductor element  3  via the second bump B 2  and electrically coupled to the second electrode terminal  64  of the vibrator  4  via the second wire W 2 . 
     As described above, the third coupling wire  213  is electrically coupled to the third coupling terminal  323  of the semiconductor element  3  via the third bump B 3 . 
     Further, the third coupling wire  213  is placed to overlap with the via  231  in the plan view. The third coupling wire  213  is electrically coupled to the first external terminal  221  as the external output terminal via the via  231 . 
     As described above, the fourth coupling wire  214  is electrically coupled to the fourth coupling terminal  324  of the semiconductor element  3  via the fourth bump B 4  and electrically coupled to the third electrode terminal  65  of the vibrator  4  via the third wire W 3 . 
     Further, the fourth coupling wire  214  is placed to overlap with the via  232  in the plan view. The fourth coupling wire  214  is electrically coupled to the second external terminal  222  via the via  232 . 
     As described above, the fifth coupling wire  215  and the sixth coupling wire  216  are electrically coupled to the fifth coupling terminal  325  and the sixth coupling terminal  326  of the semiconductor element  3  via the fifth bump B 5  and the sixth bump B 6 , respectively. 
     Further, the fifth coupling wire  215  and the sixth coupling wire  216  are placed to overlap with the vias  233 ,  234  in the plan view, respectively. The fifth coupling wire  215  and the sixth coupling wire  216  are electrically coupled to the third external terminal  223  and the fourth external terminal  224  via the vias  233 ,  234 , respectively. 
     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 . 
     Further, as shown in  FIG.  2   , in the embodiment, the semiconductor element  3  has the substantially rectangular planar shape. The semiconductor element  3  has a first side  3 A, a second side  3 B, a third side  3 C, and a fourth side  3 D in the plan view. The first side  3 A of the semiconductor element  3  is a side defining an end portion at the minus side in the X direction of the semiconductor element  3 . The second side  3 B of the semiconductor element  3  is a side facing the first side  3 A and defining an end portion at the plus side in the X direction of the semiconductor element  3 . The third side  3 C and the fourth side  3 D of the semiconductor element  3  are sides respectively coupling the first side  3 A and the second side  3 B. The third side  3 C is the side defining an end portion at the plus side in the Y direction of the semiconductor element  3 . The fourth side  3 D is the side facing the third side  3 C and defining an end portion at the minus side in the Y direction of the semiconductor element  3 . 
     The semiconductor substrate  31  is in a plate shape formed to have a substantially rectangular planar 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 , 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 formed. 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 . 
     The first coupling terminal  321  and the second coupling terminal  322  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 first coupling terminal  321  and the second coupling terminal  322 . The third coupling terminal  323  is a reference signal output terminal for outputting the reference signal such as a clock signal. The fourth coupling terminal  324  is a ground terminal for coupling to a ground potential. The fifth coupling terminal  325  is a power supply terminal for coupling to a power supply. The sixth coupling terminal  326  is an output enable terminal for controlling the output from the third coupling terminal  323  as the reference signal output terminal. 
     Note that, in the embodiment, the six coupling terminals of 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 formed, however, the number of the coupling terminals formed on the semiconductor element  3  is not particularly limited. The number of coupling terminals may be appropriately set according to the configuration of the semiconductor element  3 . 
     Further, the first bump B 1 , the second bump B 2 , the third bump B 3 , the fourth bump B 4 , the fifth bump B 5 , and the sixth bump B 6  are placed between the base  2  and the semiconductor element  3 . 
     The first bump B 1  is placed to overlap with the first coupling wire  211  formed 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 and mechanically coupled via the first bump B 1 . 
     Similarly, 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  and 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 electrically and mechanically coupled via the second bump B 2 , the third bump B 3 , the fourth bump B 4 , the fifth bump B 5 , and the sixth bump B 6 , respectively. Note that the first bump B 1 , the second bump B 2 , the third bump B 3 , the fourth bump B 4 , the fifth bump B 5 , and the sixth bump 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 . 
     Further, as shown in  FIG.  2   , in the embodiment, the vibrator  4  is formed to have a substantially rectangular planar shape. The vibrator  4  has a first side  4 A, a second side  4 B, a third side  4 C, and a fourth side  4 D in the plan view. The first side  4 A of the vibrator  4  is a side defining an end portion at the minus side in the X direction of the vibrator  4 . The second side  4 B of the vibrator  4  is a side facing the first side  4 A and defining an end portion at the plus side in the X direction of the vibrator  4 . The third side  4 C and the fourth side  4 D of the vibrator  4  are sides respectively coupling the first side  4 A and the second side  4 B. The third side  4 C is a side defining an end portion at the plus side in the Y direction of the vibrator  4 . The fourth side  4 D is a side facing the third side  4 C and defining an end portion at the minus side in the Y direction of the vibrator  4 . 
     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 first excitation electrode  521  and a second excitation electrode  522  as a pair of excitation electrodes, a pair of pad electrodes  523 ,  524 , and a pair of lead wires  525 ,  526 . The first excitation electrode  521  is placed on an upper surface of the vibrating portion  511 . The second excitation electrode  522  is placed on a lower surface of the vibrating portion  511 . The first excitation electrode  521  and the second 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 first 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 second excitation electrode  522  and the pad electrode  524 . 
     Drive signals are applied to the first excitation electrode  521  and the second excitation electrode  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 first excitation electrode  521  and the second excitation electrode  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 . In the embodiment, the base member  61  is formed to have a substantially rectangular planar shape. 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 wire  618  formed using a conductive wire. 
     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 formed. 
     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 first 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 first coupling wire  211  formed on the base  2  are electrically coupled via the first wire W 1 . That is, the first coupling wire  211  and the first excitation electrode  521  are electrically coupled via the first wire W 1 . 
     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 second 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 second coupling wire  212  placed on the upper surface of the base  2  are electrically coupled via the second wire W 2 . That is, the second coupling wire  212  and the second excitation electrode  522  are electrically coupled via the second wire W 2 . 
     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 fourth coupling wire  214  placed on the upper surface of the base  2  are electrically coupled via the third wire W 3 . 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 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. 
     Note that, in the embodiment, the four electrode terminals of the first electrode terminal  63 , the second electrode terminal  64 , the third electrode terminal  65 , and the fourth electrode terminal  66  are formed, however, the number of the electrode terminals formed on the vibrator  4  is not particularly limited. The number of electrode terminals may be appropriately set according to the configuration of the vibrator  4 . 
     Further, in the embodiment, the four electrode terminals of the first electrode terminal  63 , the second electrode terminal  64 , the third electrode terminal  65 , and the fourth electrode terminal  66  are placed in a square lattice form, however, the placement of the electrode terminals formed on the vibrator  4  is not particularly limited. For example, the four electrode terminals of the first electrode terminal  63 , the second electrode terminal  64 , the third electrode terminal  65 , and the fourth electrode terminal  66  may be placed in a triangular lattice form. 
     As above, the base  2 , the semiconductor element  3 , and the vibrator  4  are explained. 
     Here, returning to  FIG.  2   , the first coupling wire  211 , the second coupling wire  212 , and the fourth coupling wire  214  formed on the base  2  will be explained in detail. 
     First, the first coupling wire  211  will be explained. 
     As described above, the first coupling wire  211  has the first coupling electrode E 1  bonded to the first wire W 1  and the second coupling electrode E 2  bonded to the first coupling terminal  321  of the semiconductor element  3  via the first bump B 1 . In the embodiment, the first coupling wire  211  is placed in a position overlapping with the first side  3 A of the semiconductor element  3  in the plan view. The first side  3 A of the semiconductor element  3  is the end portion at the minus side in the X direction in the semiconductor element  3  in the plan view. The first coupling electrode E 1  is the part not overlapping with the semiconductor element  3  in the plan view and placed at the minus side in the X direction of the first side  3 A. The second coupling electrode E 2  is the part overlapping with the semiconductor element  3  in the plan view and placed at the plus side in the X direction of the first side  3 A. In the embodiment, the first coupling electrode E 1  is placed adjacent to the first side  3 A of the semiconductor element  3  in the plan view. As described above, the distance between the end portion of the semiconductor element  3  bonded to the base  2  and the first coupling electrode E 1  provided on the base  2  may be made shorter, and further downsizing of the vibrator device  1  may be realized. 
     Note that, in the embodiment, the first coupling electrode E 1  and the second coupling electrode E 2  are adjacent to each other with the first side  3 A of the semiconductor element  3  as a boundary in the plan view, however, the first coupling electrode E 1  and the second coupling electrode E 2  are not necessarily adjacent to each other as long as the first coupling electrode E 1  and the second coupling electrode E 2  are electrically coupled. For example, the first coupling wire  211  may further have a wiring portion electrically coupling the first coupling electrode E 1  and the second coupling electrode E 2  in addition to the first coupling electrode E 1  and the second coupling electrode E 2 . According to the configuration, the first coupling electrode E 1  and the second coupling electrode E 2  may be formed apart at a distance while being electrically coupled. 
     Next, the second coupling wire  212  will be explained. 
     As described above, the second coupling wire  212  has the third coupling electrode E 3  bonded to the second wire W 2  and the fourth coupling electrode E 4  bonded to the second coupling terminal  322  of the semiconductor element  3  via the second bump B 2 . In the embodiment, the second coupling wire  212  is placed in a position overlapping with the first side  3 A of the semiconductor element  3  in the plan view. The third coupling electrode E 3  is the part not overlapping with the semiconductor element  3  in the plan view and placed at the minus side in the X direction of the first side  3 A. The fourth coupling electrode E 4  is the part overlapping with the semiconductor element  3  in the plan view and placed at the plus side in the X direction of the first side  3 A. In the embodiment, the third coupling electrode E 3  is placed adjacent to the first side  3 A of the semiconductor element  3  in the plan view. As described above, the distance between the end portion of the semiconductor element  3  bonded to the base  2  and the third coupling electrode E 3  provided on the base  2  may be made shorter, and further downsizing of the vibrator device  1  may be realized. 
     Note that, in the embodiment, the third coupling electrode E 3  and the fourth coupling electrode E 4  are adjacent to each other with the first side  3 A of the semiconductor element  3  as a boundary in the plan view, however, the third coupling electrode E 3  and the fourth coupling electrode E 4  are not necessarily adjacent to each other as long as the third coupling electrode E 3  and the fourth coupling electrode E 4  are electrically coupled. 
     Next, the fourth coupling wire  214  is explained. 
     As described above, the fourth coupling wire  214  has the fifth coupling electrode E 5  bonded to the third wire W 3  and the sixth coupling electrode E 6  bonded to the fourth coupling terminal  324  of the semiconductor element  3  via the fourth bump B 4 . In the embodiment, the fourth coupling wire  214  is placed in a position overlapping with the second side  3 B of the semiconductor element  3  in the plan view. The second side  3 B of the semiconductor element  3  is the end portion at the plus side in the X direction in the semiconductor element  3  in the plan view. The fifth coupling electrode E 5  is the part not overlapping with the semiconductor element  3  in the plan view and placed at the plus side in the X direction of the second side  3 B. The sixth coupling electrode E 6  is the part overlapping with the semiconductor element  3  in the plan view and placed at the minus side in the X direction of the second side  3 B. In the embodiment, the fifth coupling electrode E 5  is placed adjacent to the second side  3 B of the semiconductor element  3  in the plan view. As described above, the distance between the end portion of the semiconductor element  3  bonded to the base  2  and the fifth coupling electrode E 5  provided on the base  2  may be made shorter, and further downsizing of the vibrator device  1  may be realized. 
     Note that, in the embodiment, the fifth coupling electrode E 5  and the sixth coupling electrode E 6  are adjacent to each other with the second side  3 B of the semiconductor element  3  as a boundary in the plan view, however, the fifth coupling electrode E 5  and the sixth coupling electrode E 6  are not necessarily adjacent to each other as long as the fifth coupling electrode E 5  and the sixth coupling electrode E 6  are electrically coupled. 
     As above, the first coupling wire  211 , the second coupling wire  212 , and the fourth coupling wire  214  are explained. 
     Next, the first drive wire  101 , the second drive wire  102 , and the external output wire  103  of the vibrator device  1  will be explained. 
     First, the first drive wire  101  and the second drive wire  102  are explained. 
     As shown in  FIGS.  1  and  2   , the first drive wire  101  and the second drive wire  102  are the pair of drive wires for applying drive signals output from the semiconductor element  3  to the vibrator  4  and oscillating the vibrator  4 . 
     In the embodiment, the first drive wire  101  has the first electrode terminal  63  formed on the vibrator  4 , the first coupling wire  211  formed on the base  2 , and the first wire W 1  electrically coupling the first electrode terminal  63  and the first coupling wire  211 . The second drive wire  102  has the second electrode terminal  64  formed on the vibrator  4 , the second coupling wire  212  formed on the base  2 , and the second wire W 2  electrically coupling the second electrode terminal  64  and the second coupling 
     As described above, the first coupling terminal  321  and second coupling terminal  322  formed on the semiconductor element  3  and the first coupling wire  211  and second coupling wire  212  are electrically coupled, respectively. Further, the first electrode terminal  63  and second electrode terminal  64  formed on the vibrator  4  and the first excitation electrode  521  and second excitation electrode  522  are electrically coupled, respectively. 
     Accordingly, the drive signals output from the first coupling terminal  321  and second coupling terminal  322  formed on the semiconductor element  3  are applied to the first excitation electrode  521  and second excitation electrode  522  of the vibrator  4  via the first drive wire  101  and second drive wire  102 , and thereby, the vibrator  4  may be oscillated. 
     Next, the external output wire  103  is explained. 
     As shown in  FIGS.  1  and  3   , the external output wire  103  is the output wire for outputting the reference signal such as a clock signal output from the semiconductor element  3  to the outside of the vibrator device  1 . 
     In the embodiment, the external output wire  103  has the third coupling wire  213 , the first external terminal  221  as the external output terminal, and the via  231  electrically coupling the third coupling wire  213  and the first external terminal  221 . 
     As described above, the third coupling terminal  323  formed on the semiconductor element  3  and the third coupling wire  213  formed on the base  2  are electrically coupled. 
     Accordingly, the reference signal output from the third coupling terminal  323  may be output to the outside of the vibrator device  1  via the external output wire  103 . 
     Here, when the first drive wire  101  and second drive wire  102  and the external output wire  103  are close to each other, parasitic capacitances produced between the first drive wire  101  and second drive wire  102  and the external output wire  103  increase. With the increase of the parasitic capacitances, the difference between the parasitic capacitance between the first drive wire  101  and the external output wire  103  and the parasitic capacitance between the second drive wire  102  and the external output wire  103  increases. When the difference in parasitic capacitance increases, frequency-power characteristics of the vibrator device  1  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. 
     That is, the parasitic capacitances produced between the first drive wire  101  and second drive wire  102  and the external output wire  103  are reduced, and thereby, the vibrator device  1  with good frequency-power characteristics may be provided. 
     As above, the first drive wire  101 , the second drive wire  102 , and the external output wire  103  are explained. 
     Returning to  FIG.  2   , the position relationship between the first coupling wire  211  and second coupling wire  212  formed on the base  2  and the third coupling wire  213  formed on the base  2  will be explained. 
     In the embodiment, the first coupling wire  211  and the second coupling wire  212  are placed side by side in the Y directions in the plan view. 
     The first coupling wire  211  and the second coupling wire  212  are placed at the minus side in the X direction of a center line L 1  passing through a center point P 1  of the vibrator  4  and extending along the Y directions in the plan view. 
     On the other hand, the third coupling wire  213  is placed at the plus side in the X direction of the center line L 1  passing through the center point P 1  of the vibrator  4  in the plan view. 
     In other words, in the plan view, the first coupling wire  211  and the second coupling wire  212  are placed at one side of the vibrator  4 , i.e., the minus side in the X direction of the center line L 1  passing through the center point P 1  of the vibrator  4 . Further, the third coupling wire  213  is placed at the other side of the vibrator  4 , i.e., the plus side in the X direction of the center line L 1  passing through the center point P 1  of the vibrator  4 . 
     As described above, in the plan view, the first coupling wire  211  and the second coupling wire  212  are placed at one side of the vibrator  4  and the third coupling wire  213  is placed at the other side of the vibrator  4 , and thereby, the distances between the first drive wire  101  and second drive wire  102  and the external output wire  103  may be made larger. Accordingly, the parasitic capacitances produced between the first drive wire  101  and second drive wire  102  and the external output wire  103  are reduced and the vibrator device  1  with good frequency-power characteristics may be provided. 
     Further, the first coupling wire  211  and the second coupling wire  212  are placed at the outside of the first side  4 A of the vibrator  4 , i.e., the minus side in the X direction of the first side  4 A of the vibrator  4  with respect to the vibrator  4  in the plan view. 
     On the other hand, the third coupling wire  213  is placed at the outside of the second side  4 B placed to face the first side  4 A of the vibrator  4 , i.e., the plus side in the X direction of the second side  4 B of the vibrator  4  with respect to the vibrator  4  in the plan view. 
     As described above, in the plan view, the first coupling wire  211  and the second coupling wire  212  are placed at the outside of the first side  4 A of the vibrator  4  and the third coupling wire  213  is placed at the outside of the second side  4 B placed to face the first side  4 A of the vibrator  4 , and thereby, the distances between the first drive wire  101  and second drive wire  102  and the external output wire  103  may be made larger. Accordingly, the parasitic capacitances produced between the first drive wire  101  and second drive wire  102  and the external output wire  103  are reduced and the vibrator device  1  with good frequency-power characteristics may be provided. 
     Next, the position relationship between the first coupling terminal  321  and second coupling terminal  322  formed on the semiconductor element  3  and the third coupling terminal  323  formed on the semiconductor element  3  will be explained. 
     In the embodiment, the first coupling terminal  321  and the second coupling terminal  322  are placed at the first side  3 A side of the semiconductor element  3  in the plan view. The first coupling terminal  321  and the second coupling terminal  322  are placed along the Y directions in the plan view. 
     The third coupling terminal  323  is placed at the second side  3 B side placed to face the first side  3 A of the semiconductor element  3  in the plan view. The third coupling terminal  323  is placed in a corner portion in which the second side  3 B of the semiconductor element  3  and the fourth side  3 D coupling the first side  3 A and the second side  3 B of the semiconductor element  3  cross in the plan view. 
     The first coupling terminal  321  and the second coupling terminal  322  are placed at the minus side in the X direction of the center line L 1  passing through the center point P 1  of the vibrator  4  and extending along the Y directions in the plan view. 
     On the other hand, the third coupling terminal  323  is placed at the plus side in the X direction of the center line L 1  passing through the center point P 1  of the vibrator  4  in the plan view. 
     In other words, in the plan view, the first coupling terminal  321  and the second coupling terminal  322  are placed at one side of the vibrator  4 , i.e., the minus side in the X direction of the center line L 1  passing through the center point P 1  of the vibrator  4 . Further, the third coupling terminal  323  is placed at the other side of the vibrator  4 , i.e., the plus side in the X direction of the center line L 1  passing through the center point P 1  of the vibrator  4 . 
     As described above, in the plan view, the first coupling terminal  321  and the second coupling terminal  322  are placed at one side of the vibrator  4  and the third coupling terminal  323  is placed at the other side of the vibrator  4 , and thereby, the distances between the first drive wire  101  and second drive wire  102  and the external output wire  103  may be made larger. Accordingly, the parasitic capacitances produced between the first drive wire  101  and second drive wire  102  and the external output wire  103  are reduced and the vibrator device  1  with good frequency-power characteristics may be provided. 
     Further, the first coupling terminal  321  and the second coupling terminal  322  are placed at the outside of the first side  4 A of the vibrator  4 , i.e., the minus side in the X direction of the first side  4 A of the vibrator  4  with respect to the vibrator  4  in the plan view. 
     On the other hand, the third coupling terminal  323  is placed at the outside of the second side  4 B placed to face the first side  4 A of the vibrator  4 , i.e., the plus side in the X direction of the second side  4 B of the vibrator  4  with respect to the vibrator  4  in the plan view. 
     As described above, in the plan view, the first coupling terminal  321  and the second coupling terminal  322  are placed at the outside of the first side  4 A of the vibrator  4  and the third coupling terminal  323  is placed at the outside of the second side  4 B placed to face the first side  4 A of the vibrator  4 , and thereby, the distances between the first drive wire  101  and second drive wire  102  and the external output wire  103  may be made larger. Accordingly, the parasitic capacitances produced between the first drive wire  101  and second drive wire  102  and the external output wire  103  are reduced and the vibrator device  1  with good frequency-power characteristics may be provided. 
     Next, the mold portion M will be explained. 
     The mold portion M is placed on the base  2 . The semiconductor element  3  and the vibrator  4  are covered by the mold portion M. 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. 
     As described above, the following effects may be obtained according to the embodiment. 
     The vibrator device  1  includes the base  2 , the semiconductor element  3 , and the vibrator  4  sequentially stacked. The semiconductor element  3  is flip-chip mounted on the base  2 , the vibrator  4  is mounted on the semiconductor element  3  via the adhesive D 1 , the first coupling wire  211  is formed on the base  2 , the semiconductor element  3  and the first coupling wire  211  are electrically coupled via the first bump B 1 , the first coupling wire  211  and the vibrator  4  are electrically coupled via the first wire W 1 , and the semiconductor element  3  and the vibrator  4  are covered by the mold portion M placed on the base  2 . 
     Thereby, the distance between the end portion of the semiconductor element  3  and the first coupling electrode E 1  coupled to the first wire W 1  of the first coupling wire  211  may be made shorter, and further downsizing of the vibrator device  1  may be realized. 
     2. Embodiment 2 
     Next, the vibrator device  1  according to embodiment 2 will be explained with reference to  FIGS.  1  and  2   . 
     The vibrator device  1  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. 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 a ground potential. For example, the semiconductor substrate  31  and the fourth coupling terminal  324  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. 
     In the embodiment, for example, the semiconductor substrate  31  is placed between the first electrode terminal  63  and second electrode terminal  64  formed on the upper surface of the vibrator  4  and the third coupling wire  213  formed on the upper surface of the base  2 . That is, for example, the semiconductor substrate  31  as the constant potential layer is placed between the first electrode terminal  63  of the first drive wire  101  and second electrode terminal  64  of the second drive wire  102  and the third coupling wire  213  of the external output wire  103 . 
     As described above, the semiconductor substrate  31  as the constant potential layer is placed between at least a part of the first drive wire  101  and the second drive wire  102  and at least a part of the external output wire  103 , and thereby, at least a part of an electric field generated between the first drive wire  101  and second drive wire  102  and the external output wire  103  may be shielded by the semiconductor substrate  31 . At least a part of the electric field generated between the first drive wire  101  and second drive wire  102  and the external output wire  103  is shielded, and thereby, parasitic capacitances produced between the first drive wire  101  and second drive wire  102  and the external output wire  103  are reduced. Therefore, the vibrator device  1  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, however, the constant potential layer 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 described above, according to the embodiment, the following effects may be obtained in addition to the effects in embodiment 1. 
     By the semiconductor substrate  31  as the constant potential layer of the semiconductor element  3 , the parasitic capacitances produced between the first drive wire  101  and second drive wire  102  and the external output wire  103  are reduced, and thereby, the vibrator device  1  with good frequency-power characteristics may be provided. 
     3. Embodiment 3 
     Next, a vibrator device  1   b  according to embodiment 3 will be explained with reference to  FIGS.  6 ,  7 , and  8   . In  FIG.  7   , for convenience of explanation, the mold portion M is transparently shown. 
     The vibrator device  1   b  of embodiment 3 is the same as that of embodiment 1 except that a base  2   b  is formed by a conductive lead frame. Note that the same configurations as those of embodiment 1 have the same signs and the overlapping explanation will be omitted. 
     As shown in  FIGS.  6 ,  7 , and  8   , the base  2   b  is formed by the conductive lead frame. Specifically, the base  2   b  has a first lead  91 , a second lead  92 , a third lead  93 , a fourth lead  94 , a fifth lead  95 , and a sixth lead  96 . The first lead  91 , the second lead  92 , the third lead  93 , the fourth lead  94 , the fifth lead  95 , and the sixth lead  96  have conductivity. The first lead  91 , the second lead  92 , the third lead  93 , the fourth lead  94 , the fifth lead  95 , and the sixth lead  96  are formed using e.g. iron-base materials or copper-base materials. 
     The semiconductor element  3  is flip-chip mounted on the first lead  91 , the second lead  92 , the third lead  93 , the fourth lead  94 , the fifth lead  95 , and the sixth lead  96  via the first bump B 1 , the second bump B 2 , the third bump B 3 , the fourth bump B 4 , the fifth bump B 5 , and the sixth bump B 6 , respectively. 
     As shown in  FIGS.  7  and  8   , the first lead  91  has a first inner lead portion  911  and a first outer lead portion  912 . 
     The first inner lead portion  911  is electrically and mechanically coupled to the semiconductor element  3  via the first bump B 1 . The first inner lead portion  911  forms a part of the base  2   b  and corresponds to a first coupling wire. The first inner lead portion  911  is covered by the mold portion M. 
     The first outer lead portion  912  is provided to extend downward from an end portion of the first inner lead portion  911 . The first outer lead portion  912  is exposed from the mold portion M. The first outer lead portion  912  forms a part of the base  2   b  and corresponds to an external terminal for electrically coupling the vibrator device  1   b  to the outside. Note that the first outer lead portion  912  may be omitted. 
     The second lead  92  has a second inner lead portion  921  and a second outer lead portion  922 . 
     The second inner lead portion  921  is electrically and mechanically coupled to the semiconductor element  3  via the second bump B 2 . The second inner lead portion  921  forms a part of the base  2   b  and corresponds to a second coupling wire. The second inner lead portion  921  is covered by the mold portion M. 
     The second outer lead portion  922  is provided to extend downward from an end portion of the second inner lead portion  921 . The second outer lead portion  922  is exposed from the mold portion M. The second outer lead portion  922  forms a part of the base  2   b  and corresponds to an external terminal for electrically coupling the vibrator device  1   b  to the outside. Note that the second outer lead portion  922  may be omitted. 
     The third lead  93 , the fourth lead  94 , the fifth lead  95 , and the sixth lead  96  have a third inner lead portion  931  and a third outer lead portion  932 , a fourth inner lead portion  941  and a fourth outer lead portion  942 , a fifth inner lead portion  951  and a fifth outer lead portion  952 , and a sixth inner lead portion  961  and a sixth outer lead portion  962 , respectively. 
     The third inner lead portion  931 , the fourth inner lead portion  941 , the fifth inner lead portion  951 , and the sixth inner lead portion  961  are electrically and mechanically coupled to the semiconductor element  3  via the third bump B 3 , the fourth bump B 4 , the fifth bump B 5 , and the sixth bump B 6 , respectively. 
     The third inner lead portion  931 , the fourth inner lead portion  941 , the fifth inner lead portion  951 , and the sixth inner lead portion  961  form parts of the base  2   b  and correspond to a third coupling wire, a fourth coupling wire, a fifth coupling wire, and a sixth coupling wire, respectively. 
     The third inner lead portion  931 , the fourth inner lead portion  941 , the fifth inner lead portion  951 , and the sixth inner lead portion  961  are covered by the mold portion M. 
     The third outer lead portion  932 , the fourth outer lead portion  942 , the fifth outer lead portion  952 , and the sixth outer lead portion  962  are provided to extend downward from end portions of the third inner lead portion  931 , the fourth inner lead portion  941 , the fifth inner lead portion  951 , and the sixth inner lead portion  961 , respectively. 
     The third outer lead portion  932 , the fourth outer lead portion  942 , the fifth outer lead portion  952 , and the sixth outer lead portion  962  are exposed from the mold portion M. 
     The third outer lead portion  932 , the fourth outer lead portion  942 , the fifth outer lead portion  952 , and the sixth outer lead portion  962  form parts of the base  2   b  and correspond to external terminals for electrically coupling the vibrator device  1   b  to the outside. Specifically, the third outer lead portion  932 , the fourth outer lead portion  942 , the fifth outer lead portion  952 , and the sixth outer lead portion  962  correspond to a first external terminal, a second external terminal, a third external terminal, and a fourth external terminal, respectively. 
     Next, the first inner lead portion  911  as the first coupling wire, the second inner lead portion  921  as the second coupling wire, and the fourth inner lead portion  941  as the fourth coupling wire will be explained. 
     First, the first inner lead portion  911  as the first coupling wire will be explained. 
     The first inner lead portion  911  has the first coupling electrode E 1  coupled to the first wire W 1  and the second coupling electrode E 2  bonded to the first coupling terminal  321  of the semiconductor element  3  via the first bump B 1 . In the embodiment, the first inner lead portion  911  is placed in a position overlapping with the first side  3 A of the semiconductor element  3  in the plan view. The first coupling electrode E 1  is placed adjacent to the first side  3 A of the semiconductor element  3  in the plan view. As described above, the distance between an end portion of the semiconductor element  3  bonded to the base  2   b  and the first coupling electrode E 1  provided on the base  2   b  may be made shorter, and further downsizing of the vibrator device  1   b  may be realized. 
     Next, the second inner lead portion  921  as the second coupling wire will be explained. 
     The second inner lead portion  921  has the third coupling electrode E 3  bonded to the second wire W 2  and the fourth coupling electrode E 4  bonded to the second coupling terminal  322  of the semiconductor element  3  via the second bump B 2 . In the embodiment, the second inner lead portion  921  is placed in a position overlapping with the first side  3 A of the semiconductor element  3  in the plan view. The third coupling electrode E 3  is placed adjacent to the first side  3 A of the semiconductor element  3  in the plan view. As described above, the distance between an end portion of the semiconductor element  3  bonded to the base  2   b  and the third coupling electrode E 3  provided on the base  2   b  may be made shorter, and further downsizing of the vibrator device  1   b  may be realized. 
     Next, the fourth inner lead portion  941  as the fourth coupling wire will be explained. 
     The fourth inner lead portion  941  has the fifth coupling electrode E 5  bonded to the third wire W 3  and the sixth coupling electrode E 6  bonded to the fourth coupling terminal  324  of the semiconductor element  3  via the fourth bump B 4 . In the embodiment, the fourth inner lead portion  941  is placed in a position overlapping with the second side  3 B of the semiconductor element  3  in the plan view. The fifth coupling electrode E 5  is placed adjacent to the second side  3 B of the semiconductor element  3  in the plan view. As described above, the distance between an end portion of the semiconductor element  3  bonded to the base  2   b  and the fifth coupling electrode E 5  provided on the base  2   b  may be made shorter, and further downsizing of the vibrator device  1   b  may be realized. 
     As above, the first inner lead portion  911  as the first coupling wire, the second inner lead portion  921  as the second coupling wire, and the fourth inner lead portion  941  as the fourth coupling wire are explained. 
     Next, the first drive wire  101 , the second drive wire  102 , and the external output wire  103  of the vibrator device  1   b  will be explained. 
     As shown in  FIGS.  6  and  7   , in the embodiment, the first drive wire  101  has the first electrode terminal  63  formed on the vibrator  4 , the first lead  91  of the base  2   b,  and the first wire W 1  electrically coupling the first electrode terminal  63  and the first lead  91 . 
     The second drive wire  102  has the second electrode terminal  64  formed on the vibrator  4 , the second lead  92  of the base  2   b,  and the second wire W 2  electrically coupling the second electrode terminal  64  and the second lead  92 . The external output wire  103  has the third lead  93 . As described above, the third lead  93  has the third inner lead portion  931  as the third coupling wire and the third outer lead portion  932  as the first external terminal. 
     As above, the first drive wire  101 , the second drive wire  102 , and the external output wire  103  are explained. 
     Next, a position relationship between the first inner lead portion  911  as the first coupling wire and second inner lead portion  921  as the second coupling wire and the third inner lead portion  931  as the third coupling wire will be explained. 
     In the embodiment, the first inner lead portion  911  as the first coupling wire and the second inner lead portion  921  as the second coupling wire are placed side by side in the Y directions in the plan view. 
     The first inner lead portion  911  and the second inner lead portion  921  are placed at the minus side in the X direction of the center line L 1  passing through the center point P 1  of the vibrator  4  and extending along the Y directions in the plan view. 
     On the other hand, the third inner lead portion  931  is placed at the plus side in the X direction of the center line L 1  passing through the center point P 1  of the vibrator  4  in the plan view. 
     In other words, in the plan view, the first inner lead portion  911  and the second inner lead portion  921  are placed at one side of the vibrator  4 , i.e., the minus side in the X direction of the center line L 1  passing through the center point P 1  of the vibrator  4 . Further, the third inner lead portion  931  is placed at the other side of the vibrator  4 , i.e., the plus side in the X direction of the center line L 1  passing through the center point P 1  of the vibrator  4 . 
     As described above, in the plan view, the first inner lead portion  911  and the second inner lead portion  921  are placed at one side of the vibrator  4  and the third inner lead portion  931  is placed at the other side of the vibrator  4 , and thereby, the distances between the first drive wire  101  and second drive wire  102  and the external output wire  103  may be made larger. Accordingly, the parasitic capacitances produced between the first drive wire  101  and second drive wire  102  and the external output wire  103  are reduced and the vibrator device  1  with good frequency-power characteristics may be provided. 
     Further, the first inner lead portion  911  and the second inner lead portion  921  are placed at the outside of the first side  4 A of the vibrator  4 , i.e., the minus side in the X direction of the first side  4 A of the vibrator  4  with respect to the vibrator  4  in the plan view. 
     On the other hand, the third inner lead portion  931  is placed at the outside of the second side  4 B placed to face the first side  4 A of the vibrator  4 , i.e., the plus side in the X direction of the second side  4 B of the vibrator  4  with respect to the vibrator  4  in the plan view. 
     As described above, in the plan view, the first inner lead portion  911  and the second inner lead portion  921  are placed at the outside of the first side  4 A of the vibrator  4  and the third inner lead portion  931  is placed at the outside of the second side  4 B placed to face the first side  4 A of the vibrator  4 , and thereby, the distances between the first drive wire  101  and second drive wire  102  and the external output wire  103  may be made larger. Accordingly, the parasitic capacitances produced between the first drive wire  101  and second drive wire  102  and the external output wire  103  are reduced and the vibrator device  1   b  with good frequency-power characteristics may be provided. 
     As described above, the following effects may be obtained according to the embodiment. 
     The vibrator device  1   b  includes the base  2   b,  the semiconductor element  3 , and the vibrator  4  sequentially stacked. The semiconductor element  3  is flip-chip mounted on the base  2   b,  the vibrator  4  is mounted on the semiconductor element  3  via the adhesive D 1 , the semiconductor element  3  and the base  2   b  are electrically coupled via the first bump B 1 , the base  2   b  and the vibrator  4  are electrically coupled via the first wire W 1 , and the semiconductor element  3  and the vibrator  4  are covered by the mold portion M placed on the base  2   b.    
     Thereby, the distance between the end portion of the semiconductor element  3  and the first coupling electrode E 1  coupled to the first wire W 1  of the first inner lead portion  911  may be made shorter, and further downsizing of the vibrator device  1   b  may be realized. 
     That is, even when the base  2   b  is formed using a conductive base frame, the same effects as those of embodiment 1 may be obtained. 
     As above, the vibrator devices  1 ,  1   b  are explained based on embodiments 1 to 3. 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.