JP2008104095A - Piezoelectric vibrator, piezoelectric device, and electronics - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piezoelectric vibrator whose rotating deviation in a planar direction is prevented, a piezoelectric device and electronic equipment using the piezoelectric vibrator. <P>SOLUTION: The piezoelectric vibrator 10 has a piezoelectric vibrating reed 12 and a package 14. A vibrator terminal 26 equipped with a junction electrode 32 and an inflow electrode 34 is provided on an undersurface of the package 14. The junction electrode 32 joints a connection member which is used when the piezoelectric vibrator 10 is mounted on a substrate. A diameter of the junction electrode 32 is substantially as large as the diameter of the connection member. Further, materials of the connection member which joints the junction electrode 32 are wet and spread in the inflow electrode 34. The vibrator terminals 26 equipped with the junction electrode 32 and the inflow electrode 34 can be provided at mutually facing positions on the undersurface of the piezoelectric vibrator 10, and can form mutually symmetrical shapes. Accordingly, a self-alignment effect can be obtained when the piezoelectric vibrator 10 is mounted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a piezoelectric vibrator, a piezoelectric device, and an electronic apparatus.

  The piezoelectric vibrator accommodates a piezoelectric vibrating piece in a package. A plurality of rectangular vibrator terminals are provided on the lower surface of the package. The vibrator terminal is a portion to be joined to an electrode provided on the substrate side via a connecting member when the piezoelectric vibrator is mounted on a substrate or the like. The vibrator terminal is a hot terminal in which two of the plurality are connected to the piezoelectric vibrating piece, and the other is a strength holding terminal for improving the bonding (mounting) strength between the piezoelectric vibrator and the substrate. Yes.

Such a piezoelectric vibrator is used for a piezoelectric oscillator, for example. The piezoelectric oscillator is equipped with an electronic component that becomes an oscillation circuit together with the piezoelectric vibrator. Patent Document 1 discloses such a piezoelectric oscillator. In the piezoelectric oscillator disclosed in Patent Document 1, an electronic component is mounted on a substrate, and a piezoelectric vibrator is disposed on a metal ball mounted on the substrate so that the electronic component and the piezoelectric vibrator have a two-story structure. I have to. The rectangular vibrator terminals provided at the four corners of the lower surface of the piezoelectric vibrator are joined to the metal balls.
JP 2002-185254 A

  In the conventional piezoelectric vibrator, each vibrator terminal is rectangular and its planar size is increased. This is to increase the bonding area with the connection member to improve the bonding strength or to ensure the conduction with the electrode on the substrate side. When mounting this piezoelectric vibrator on the substrate, after providing the molten connection member on the electrode on the substrate side, the piezoelectric vibrator is provided on the connection member so that the connection member and the vibrator terminal overlap, The piezoelectric vibrator and the substrate are fixed by solidifying the connecting member. However, if the planar size of the vibrator terminal is large, the connecting member joined to the vibrator terminal wets and spreads on the vibrator terminal, so that the piezoelectric vibrator rotates in the planar direction.

  FIG. 8 is a plan view when the piezoelectric vibrator according to the prior art is mounted on a substrate. FIG. 8A is a plan view when the piezoelectric vibrator can be mounted at a predetermined position on the substrate. FIG. 8B is a plan view when the piezoelectric vibrator mounted on the substrate rotates. As shown in FIG. 8A, when the piezoelectric vibrator 1 can be mounted at a predetermined position without being displaced in the plane direction, the metal ball 2 is disposed inside the vibrator terminal 4, and the substrate 3 and the side of the piezoelectric vibrator 1 are substantially parallel to each other. On the other hand, if the vibrator terminal 4 is large as described above, the rotational position shift occurs in the piezoelectric vibrator 1 as shown in FIG. 8B, and the position shifts from the predetermined position shown in FIG. Thus, the piezoelectric vibrator 1 is bonded to the substrate 3. If the rotational position deviation is large, the piezoelectric vibrator 1 may protrude from the substrate 3.

  Further, in a piezoelectric oscillator in which a piezoelectric vibrator and an electronic component are mounted on a substrate in a two-story structure as disclosed in Patent Document 1, the electronic component and the electrode on the substrate side are electrically connected by a wire. There is. In this case, when the piezoelectric vibrator rotates in the plane direction, it interferes with the wire. That is, problems such as shorting due to contact between the transducer terminal and the wire occur. Further, this piezoelectric oscillator becomes a defective product when the piezoelectric vibrator rotates in the plane direction, and the plane size increases, and when the rotational deviation of the piezoelectric vibrator exceeds an allowable amount.

  An object of this invention is to provide the piezoelectric vibrator which prevented the rotational position shift | offset | difference of the planar direction. Another object of the present invention is to provide a piezoelectric device and an electronic apparatus using the piezoelectric vibrator.

  The piezoelectric vibrator according to the present invention includes a package containing a piezoelectric vibrating piece, and vibrator terminals provided on a lower surface of the package include a joining electrode on which a connecting member is disposed, an inflow electrode connected to the joining electrode, It is characterized by having. Thereby, self-alignment works when the piezoelectric vibrator is mounted, and the piezoelectric vibrator can be arranged at a predetermined position.

  The vibrator terminal described above constitutes a hot terminal that is conducted to the piezoelectric vibrating piece and a strength holding terminal that increases the mounting strength. The areas of the hot terminal and the strength holding terminal are the same or substantially the same, and the bonding electrode and The vibrator terminal including the inflow electrode is a strength holding terminal. As a result, the amount (area) of the material of the connection member that spreads out becomes the same, so that the distance between the connection member and the vibrator terminal in each vibrator terminal, that is, the distance from the substrate to the vibrator can be made the same. . Therefore, the piezoelectric vibrator can be mounted in parallel to the substrate.

  The piezoelectric vibrator according to the present invention is characterized in that the planar shape of the bonding electrode is circular. As a result, the bonding electrode is reduced, so that the displacement amount of the piezoelectric vibrator is reduced, and self-alignment when the piezoelectric vibrator is mounted can be enhanced.

  The piezoelectric vibrator according to the present invention satisfies the relationship of (1.0 × L2) <L1 ≦ (1.3 × L2), where L1 is the diameter of the bonding electrode and L2 is the diameter of the connecting member. It is said. As a result, the connecting member can be reliably bonded to the bonding electrode, and the piezoelectric vibrator can be positioned by self-alignment. Moreover, since a fillet can be formed in a joining electrode, joining of a joining electrode and a connection terminal can be ensured.

  The vibrator terminals provided with the junction electrode and the inflow electrode described above are provided at positions facing each other, and their shapes are symmetric. Accordingly, the piezoelectric vibrator can be prevented from rotating in the plane direction, self-alignment can be improved, and the piezoelectric vibrator can be accurately arranged at a predetermined position.

  The piezoelectric device according to the present invention includes the piezoelectric vibrator described above, a substrate on which a wiring pattern is formed, an electronic component disposed on one surface of the substrate, and a piezoelectric resonator disposed on one surface of the substrate. And a plurality of connecting members for connecting the piezoelectric vibrator and the substrate with a predetermined interval between the lower surface of the substrate and one surface of the substrate. Even if the piezoelectric vibrator is arranged on the connection member, self-alignment works, so that the piezoelectric vibrator can be arranged at a predetermined position with respect to the substrate. And when the shape of the plurality of connecting members is spherical, the piezoelectric vibrator tends to rotate especially with respect to the substrate, and mounting deviation is likely to occur. However, according to the piezoelectric device according to the present invention, such a phenomenon is prevented. Can be prevented. For this reason, the planar size of the piezoelectric device can be reduced.

  In addition, the piezoelectric device according to the present invention includes a piezoelectric vibrator having a planar shape of the bonding electrode, a substrate on which a wiring pattern is formed, an electronic component disposed on one surface of the substrate, and one surface of the substrate. A plurality of connection members that are disposed on the connection member disposing electrodes formed on the substrate and connect the piezoelectric vibrator and the substrate with a predetermined interval between the lower surface of the piezoelectric vibrator and one surface of the substrate; The center of the circular joining electrode of the piezoelectric vibrator and the center of the circular connection member disposing electrode are present at substantially the same position in plan view. As a result, the center of the bonding electrode and the center of the connection member arranging electrode are positioned on a line segment extending in the direction perpendicular to the one surface of the substrate. Therefore, even if the piezoelectric vibrator is disposed on the connection member, self-alignment works, so that the piezoelectric vibrator can be disposed at a predetermined position with respect to the substrate. Even if the shape of the plurality of connection members is spherical, it is possible to prevent mounting displacement due to rotation of the piezoelectric vibrator relative to the substrate.

  An electronic apparatus according to the present invention is characterized by mounting the above-described piezoelectric device. Some electronic devices tend to be more compact. In such an electronic device, a space for mounting various electronic devices such as a piezoelectric device is limited. However, since the piezoelectric device having the above-described features is downsized in the plane direction, It can be mounted in the space.

  Hereinafter, embodiments of a piezoelectric vibrator, a piezoelectric device, and an electronic apparatus according to the present invention will be described. First, the first embodiment will be described. FIG. 1 is an explanatory diagram of a piezoelectric vibrator. Here, FIG. 1A shows a cross-sectional view of the piezoelectric vibrator, and FIG. 1B shows a bottom view of the piezoelectric vibrator. The piezoelectric vibrator 10 houses a piezoelectric vibrating piece 12 in a package 14. The package 14 includes a package base 18 and a lid 16. The package base 18 includes a recessed portion 20 that opens upward. The lid 16 is bonded to the upper surface of the package base 18 to hermetically seal the recessed portion 20. The package base 18 includes a mount electrode 22 to be joined to the piezoelectric vibrating piece 12 in the recessed portion 20. A conductive adhesive 24 is provided on the mount electrode 22, and the piezoelectric vibrating reed 12 is electrically and mechanically connected by the conductive adhesive 24. The piezoelectric vibrating piece 12 may be a piezoelectric vibrating piece using a AT-cut piezoelectric substrate or the like, a tuning fork type piezoelectric vibrating piece, a surface acoustic wave element piece, or the like.

  The package base 18 includes a plurality of vibrator terminals 26 on the lower surface. In the present embodiment, as shown in FIG. 1B, four vibrator terminals 26 are provided, and are provided in the vicinity of each corner on the lower surface of the piezoelectric vibrator 10. Of the four vibrator terminals 26, two of the four are electrically connected to the mount electrode 22 to become hot terminals 28, and the other two increase the bonding strength when the piezoelectric vibrator 10 is mounted on the substrate. Strength holding terminal 30 is provided. The strength holding terminal 30 can be set to the ground potential.

  The hot terminals 28 in the case shown in FIG. 1B are provided at both ends of any side (the short side on the left side of the drawing) that forms the lower surface of the piezoelectric vibrator 10. As for the shape of the hot terminal 28, the central portion side of the lower surface of the piezoelectric vibrator 10 is cut off, and the shape in plan view is substantially rectangular. For this reason, the hot terminal 28 can be reliably joined to the mount electrode 22 by reliably joining the conductive connection member 68 (see FIG. 5).

  The strength holding terminals 30 are provided at the corners of the lower surface of the piezoelectric vibrator 10 not provided with the hot terminals 28. In the case shown in FIG. 1B, the strength holding terminals 30 are provided at both ends of the short side on the right side of the drawing. It is. The strength holding terminal 30 includes a joining electrode 32 on which the connection member 68 is disposed, and an inflow electrode 34 connected to the joining electrode 32. Specifically, the bonding electrode 32 is a terminal that is electrically and mechanically connected to the connection member 68.

  The shape of the bonding electrode 32 may be any shape, but the area that can be bonded to the connection member 68 can be reduced if the shape is a circular shape with the center being Cr. That is, the circular bonding electrode 32 has a smaller area that can be bonded to the connection member 68 than the conventional rectangular vibrator terminal, and the displacement amount of the piezoelectric vibrator 10 can be reduced as compared with the conventional one. Further, when the shape of the bonding electrode 32 is a circle, the diameter L1 may be approximately the same as the diameter L2 of the connection member 68 such as a solder ball. Specifically, the diameter L1 of the bonding electrode 32 and the diameter L2 of the connection member 68 may satisfy the relationship of (1.0 × L2) <L1 ≦ (1.3 × L2). Thus, the piezoelectric vibrator 10 is not displaced by self-alignment, and the bonding electrode 32 and the connection member 68 are reliably bonded.

  The inflow electrode 34 is a terminal into which a part of the material of the molten connection member 68 flows when the connection member 68 is melted and fixed to the bonding electrode 32. For example, when the connection member 68 is a solder ball, the solder ball and the bonding electrode 32 are fixed to form a fillet, and a part of the molten solder wets and spreads on the inflow electrode 34. The inflow electrode 34 is formed along the long side 10 a of the side sides forming the lower surface of the piezoelectric vibrator 10, and one end thereof is connected to the bonding electrode 32. The width of the inflow electrode 34 is narrower than the diameter of the bonding electrode 32.

  All the transducer terminals 26 have the same area. That is, the substantially rectangular hot terminal 28 and the strength holding terminal 30 including the bonding electrode 32 and the inflow electrode 34 have the same or substantially the same area. As a result, when the connection member 68 is connected to the vibrator terminal 26, the area where the material of the connection member 68 wets and spreads becomes the same, and the piezoelectric material is applied from the substrate at each location where the connection member 68 and the vibrator terminal 26 are joined. The height to the vibrator 10 is the same.

  The strength holding terminal 30 may have the shape illustrated in FIG. 2 as well as the shape illustrated in FIG. FIG. 2 is a plan view showing one strength holding terminal. In the strength holding terminal 30a shown in FIG. 2A, a circular bonding electrode 32 having a center of Cr is provided in the vicinity of the corner of the lower surface of the piezoelectric vibrator 10, and substantially L is adjacent to the bonding electrode 32. An inflow electrode 34a having a letter shape is provided. The inflow electrode 34 a is provided on the center side of the lower surface of the piezoelectric vibrator 10 with respect to the bonding electrode 32. A side of the inflow electrode 34 a on the side of the bonding electrode 32 has an arc shape along the outer shape of the bonding electrode 32. A part of the inflow electrode 34 a extends toward the bonding electrode 32, and the extending portion is connected to the bonding electrode 32. Note that the width of the extended portion is narrower than the diameter of the bonding electrode 32.

  Further, the strength holding terminal 30b shown in FIG. 2B is provided with a circular bonding electrode 32 whose center is Cr near the corner of the lower surface of the piezoelectric vibrator 10. The strength holding terminal 30b has two inflow electrodes 34b, and one inflow electrode 34b is formed along the long side 10a of the side edges forming the lower surface of the piezoelectric vibrator 10. One end thereof is connected to the bonding electrode 32. The other inflow electrode 34 b is formed along the short side 10 b of the sides forming the lower surface of the piezoelectric vibrator 10, and one end thereof is connected to the bonding electrode 32. The width of these inflow electrodes 34 b is narrower than the diameter of the bonding electrode 32.

  In addition, the strength holding terminal 30c shown in FIG. 2C is provided with a circular bonding electrode 32 whose center is Cr near the corner of the lower surface of the piezoelectric vibrator 10. The inflow electrode 34 c is formed along the side that forms the lower surface of the piezoelectric vibrator 10, and one end thereof is connected to the bonding electrode 32. The other end of the inflow electrode 34 c is bent in an L shape toward the inside of the lower surface of the piezoelectric vibrator 10.

Further, the strength holding terminal 30d shown in FIG. 2D is provided with a circular bonding electrode 32 having a center of Cr in the vicinity of the corner of the lower surface of the piezoelectric vibrator 10. The strength holding terminal 30d has a plurality of inflow electrodes 34d and is formed such that the bonding electrodes 32d extend radially from the bonding electrodes 32.
The strength holding terminals 30a, 30b, 30c, and 30d shown in FIGS. 2A to 2D have the same area as the hot terminal 28 as described above.

  According to such a piezoelectric vibrator 10, the vibrator terminal 26 including the joining electrode 32 and the inflow electrode 34 is provided on the lower surface, and the diameter L1 of the joining electrode 32 and the diameter L2 of the connecting member 68 are approximately equal. Self-alignment when mounting the piezoelectric vibrator 10 can be enhanced. That is, in the piezoelectric vibrator 10, the bonding electrode 32 of the strength holding terminal 30 is slightly larger than the diameter of the connection member 68 fixed to the strength holding terminal 30, so that it is prevented from rotating in the plane direction due to self-alignment during mounting. And can be arranged at a predetermined position.

  In addition, since the diameter of the bonding electrode 32 is larger than that of the connection member 68, the connection member 68 can be reliably bonded to the bonding electrode 32 even if a positional deviation occurs in the print pattern when forming the bonding electrode 32. Can do. Moreover, a fillet can be formed with the material of the molten connection member 68, and the joining electrode 32 and the connection member 68 can be joined reliably.

  In addition, the inflow electrode 34 can prevent the connecting member 68 from staying on the bonding electrode 32 because the molten material of the connecting member 68 spreads out. If the strength holding terminal 30 is formed only by the bonding electrode 32, the connecting member 68 remains on the bonding electrode 32, and the space between the connecting member 68 and the piezoelectric vibrator 10 becomes thick. However, by connecting the inflow electrode 34 to the bonding electrode 32, it is possible to prevent the variation in the height direction. Further, by making the width of the inflow electrode 34 smaller than the diameter of the bonding electrode 32, the above-described self-alignment effect can be obtained. Therefore, the piezoelectric vibrator 10 can be stably mounted.

  Further, since the areas of the plurality of vibrator terminals 26 are made to be approximately the same, the areas where the material of the melted connection member 68 spreads out can be made the same. As a result, the thickness between the transducer terminal 26 and the connection member 68 can be made the same, and variations in the height direction at each transducer terminal 26 can be prevented.

  Next, a second embodiment will be described. In the second embodiment, a modification of the vibrator terminal will be described. Specifically, the position of the inflow electrode constituting the vibrator terminal is limited. FIG. 3 is a plan view of a pair of strength holding terminals. The strength holding terminals 30 illustrated in the respective drawings of FIGS. 3A to 3C are located near both ends of any one short side of the side forming the lower surface of the piezoelectric vibrator 10, that is, facing each other. At the position. Each strength holding terminal 30 has a symmetrical shape.

  That is, in the strength holding terminal 30 shown in FIG. 3A, a circular bonding electrode 32 having a center as Cr is provided at a position facing the short side 10b in the vicinity of the corner of the lower surface of the piezoelectric vibrator 10. Each joining electrode 32 is connected to an inflow electrode 34 extending in the direction toward the center of the lower surface of the piezoelectric vibrator 10. Such a strength holding terminal 30 has a symmetrical shape with respect to the center of the short side 10b forming the lower surface of the piezoelectric vibrator 10 (a position indicated by a one-dot chain line A in FIG. 3A). Note that the strength holding terminal 30 having the shape shown in FIG. 3A has the same area as the hot terminal 28 (not shown in FIG. 3).

  In addition, the strength holding terminal 30 shown in FIG. 3B is provided with a circular bonding electrode 32 with the center being Cr at the opposing position in the direction of the short side 10b in the vicinity of the corner of the lower surface of the piezoelectric vibrator 10. An inflow electrode 34 along the short side 10 b that forms the lower surface of the piezoelectric vibrator 10 is connected to each bonding electrode 32. Such a strength holding terminal 30 has a symmetrical shape with respect to the center of the short side 10b forming the lower surface of the piezoelectric vibrator 10 (a position indicated by a one-dot chain line B in FIG. 3B). Note that the strength holding terminal 30 having the shape shown in FIG. 3B has the same area as the hot terminal 28 (not shown in FIG. 3).

  3C has a configuration in which the inflow electrodes 34 of the strength holding terminal 30 shown in FIG. 3B are connected to each other. Such a strength holding terminal 30 has a symmetrical shape with respect to the center of the short side 10b forming the lower surface of the piezoelectric vibrator 10 (a position indicated by a one-dot chain line C in FIG. 3C).

  Further, the strength holding terminal 30 may have a shape shown in FIG. That is, the bonding electrode 32 is provided at a position facing the short side 10 b in the vicinity of the corner of the lower surface of the piezoelectric vibrator 10. An inflow electrode 34 along the long side 10 a that forms the lower surface of the piezoelectric vibrator 10 is connected to each bonding electrode 32. Even such a strength holding terminal 30 has a symmetrical shape with respect to the center of the short side 10 b forming the lower surface of the piezoelectric vibrator 10.

  Further, the strength holding terminal 30 may have a shape exemplified below. FIG. 4 is a bottom view of a piezoelectric vibrator in which strength holding terminals are provided at opposite corners. Some piezoelectric vibrators 10 are provided with hot terminals 28 at diagonal positions on the lower surface thereof. Even in this case, the strength holding terminals 30 may be provided at positions facing each other, and the shapes thereof may be symmetrical. That is, the strength holding terminal 30 is provided at a corner portion on the lower surface of the piezoelectric vibrator 10 where the hot terminal 28 is not formed.

  Specifically, the strength holding terminal 30 shown in FIG. 4A is provided with a circular bonding electrode 32 with the center being Cr at the diagonal position on the lower surface of the piezoelectric vibrator 10. The junction electrode 32 is connected with an inflow electrode 34 extending toward one of the corners where the hot terminal 28 is provided. Such a strength holding terminal 30 has a substantially symmetric shape with respect to a line (a broken line D in FIG. 4A) connecting corner portions where the hot terminals 28 are provided. The strength holding terminal 30 has the same area as the hot terminal 28.

In addition, the strength holding terminal 30 shown in FIG. 4B is provided with a circular bonding electrode 32 whose center is Cr at a diagonal position on the lower surface of the piezoelectric vibrator 10. An inflow electrode 34 extending toward the center of the lower surface of the piezoelectric vibrator 10 is connected to the bonding electrode 32. Such a strength holding terminal 30 has a substantially symmetric shape with respect to a line (a broken line E in FIG. 4B) connecting corner portions where the hot terminals 28 are provided. The strength holding terminal 30 has the same area as the hot terminal 28.
Further, the strength holding terminal 30 shown in FIG. 4C has a configuration in which the inflow electrodes 34 of the strength holding terminal 30 shown in FIG. 4B are connected to each other.

  As described above, if the strength holding terminals 30 are provided at positions opposed to each other and are formed in line-symmetrical shapes, the piezoelectric vibrator 10 is self-aligned when the piezoelectric vibrator 10 is mounted on the substrate. Can be reliably disposed at a predetermined position. That is, when the piezoelectric vibrator 10 is mounted, even if the piezoelectric vibrator 10 attempts to rotate in the direction in which one inflow electrode 34 in one strength holding terminal 30 extends, the other inflow electrode 34 in the other strength holding terminal 30 is The piezoelectric vibrator 10 cannot rotate along the other inflow electrode 34 because it extends in a direction symmetrical to the inflow electrode 34. For this reason, the piezoelectric vibrator 10 is not rotationally displaced.

  Next, a third embodiment will be described. In the third embodiment, a piezoelectric device including the piezoelectric vibrator 10 described in the first and second embodiments will be described. FIG. 5 is a sectional view of the piezoelectric device. FIG. 6 is a plan view of a substrate on which electronic components are mounted. As shown in FIG. 5, the piezoelectric device 50 has an insulating substrate 52, and an external terminal 54 is provided on the other surface of the substrate 52. As shown in FIG. 6, a connection member arrangement electrode 56, a wire bonding electrode 70, a shield electrode (not shown), and a wiring pattern 58 are provided on one surface of the substrate 52. The connection member arranging electrode 56 has a circular shape, and the connection member 68 is arranged thereon. The center of the circular connection member arrangement electrode 56 is Cs.

  Further, an insulating film 60 is provided on one surface of the substrate 52 except for the upper surfaces of the connection member arranging electrode 56 and the wire bonding electrode 70. The insulating film 60 may be a resist film, for example. Since the wiring pattern 58 and the shield electrode are covered with the insulating film 60, the wiring pattern 58 and the shield electrode are not short-circuited with other wiring patterns 58 and the like, and directly with the electronic component 62 fixed on the insulating film 60 as described later. There is no short circuit. Therefore, as shown in FIG. 5, since the wiring pattern 58 and the like can be disposed below the electronic component 62, the single-layer substrate 52 can be used, and the wiring pattern 58 can be freely routed. The degree is improved.

  An electronic component 62 is disposed on the insulating film 60. The electronic component 62 is fixed using a bonding material such as an adhesive or a tape. This bonding material is preferably non-conductive. The electronic component 62 may be provided with a circuit (oscillation circuit) that supplies an electric signal to the piezoelectric vibrator 10 to oscillate and amplify it, and is an integrated circuit (IC) chip.

  The shield electrode is disposed below the electronic component 62, and a wire bonding electrode 70 is disposed around the electronic component 62 as shown in FIG. The electronic component 62 is provided with a wire bonding pad 64 on the active surface, and is fixed on the insulating film 60 with the active surface facing upward and the inactive surface facing the substrate 52 side. Then, the wire 66 is joined to the wire bonding pad 64 and the wire bonding electrode 70 so that they are conducted. There are a plurality of wire bonding pads 64, some of which are electrically connected to the external terminal 54 via the wiring pattern 58, and the other are electrically connected to the connection member arranging electrode 56 via the wiring pattern 58 (see FIG. 5). ). That is, the electronic component 62 and the external terminal 54 are electrically connected. The shield electrode eliminates the influence of electromagnetic noise applied from the outside of the piezoelectric device 50, and is electrically connected to the external terminal 54 (ground terminal) having a ground potential via the wiring pattern 58.

  A connection member 68 is provided on the connection member arrangement electrode 56 exposed from the insulating film 60, and the piezoelectric vibrator 10 is provided on the connection member 68. The connection member 68 may be a solder ball, or may be a core formed by solder plating of a copper ball or a resin ball. Thus, by making the connection member 68 have a double structure, the core serves as a spacer, and the height of the piezoelectric vibrator 10 disposed on the connection member 68 from the substrate 52 is constant. While being maintained, the electrical and mechanical connection between the connection member arranging electrode 56 and the piezoelectric vibrator 10 is ensured. The highest part of the connection member 68 is above the highest part of the wire 66.

  The connecting member 68 is joined to the vibrator terminal 26 of the piezoelectric vibrator 10. As a result, the piezoelectric vibrator 10 is disposed on the connection member 68, and the electronic component 62 and the piezoelectric vibrator 10 have a two-story structure. At this time, as shown in FIG. 5, the shape of the portion of the substrate 52 exposed from the insulating film 60 of the connection member arranging electrode 56 is circular, and passes through the center Cs of the circle and passes through one of the substrates 52. The piezoelectric vibrator 10 is arranged so that the center Cr of the bonding electrode 32 of the piezoelectric vibrator 10 is positioned on a line segment extending in a direction perpendicular to the surface. That is, the center Cs of the circle exposed from the insulating film 60 of the connection member arranging electrode 56 and the center Cr of the bonding electrode 32 of the piezoelectric vibrator 10 are located at substantially the same position in plan view of the piezoelectric device 10. Existing.

  The back surface of the piezoelectric vibrator 10 and the wire 66 are not in contact. Further, at the time of joining, the same material as that of the connection member 68 may be applied to the connection member 68 or the vibrator terminal 26 and the vibrator terminal 26 and the connection member 68 may be joined. Accordingly, the piezoelectric vibrator 10 and the substrate 52 are securely fixed via the connection member 68, and the piezoelectric vibrator 10 and the electronic component 62 are reliably conducted.

  The periphery of the piezoelectric vibrator 10 and the electronic component 62 is covered with a resin mold material 69. Accordingly, the piezoelectric vibrator 10, the electronic component 62, the connection member 68, the wire 66, and the like are protected from external impacts and the like, and the reliability of the piezoelectric device 50 is improved.

  In such a piezoelectric device 50, since the piezoelectric vibrator 10 having the above-described characteristics is mounted on the connection member 68, the piezoelectric vibrator 10 is brought to a predetermined position by self-alignment when the piezoelectric vibrator 10 is mounted. Can be placed. That is, when the shape of the plurality of connection members 68 is spherical, the piezoelectric vibrator 10 is particularly likely to rotate due to rotation with respect to the substrate 52. However, according to the present embodiment, such a phenomenon is caused. Can be prevented. Since the piezoelectric device 50 does not need to have a large planar size of the resin mold material 69 so that the piezoelectric vibrator 10 does not come out of the resin mold material 69, the planar size can be reduced.

  The piezoelectric device 50 described above is a piezoelectric oscillator because it includes the piezoelectric vibrator 10 and the oscillation circuit (electronic component 62). In addition to the oscillation circuit, the electronic component 62 includes a voltage control circuit, a temperature compensation circuit, a circuit capable of setting an arbitrary output frequency by programming, and a date from the frequency signal output from the piezoelectric vibrator 10 It is also possible to provide a circuit for generating and outputting digital data such as a drive / detection circuit for a gyro sensor. Therefore, the piezoelectric device 50 can also constitute a piezoelectric oscillator, a piezoelectric oscillator having a voltage control function or a temperature compensation function, a real-time clock device, a gyro sensor, or the like.

  Next, a fourth embodiment will be described. In the fourth embodiment, an electronic apparatus including the piezoelectric vibrator 10 described in the first and second embodiments and the piezoelectric device 50 described in the third embodiment will be described. There are various electronic devices on which the piezoelectric vibrator 10 and the piezoelectric device 50 are mounted. In the fourth embodiment, a digital mobile phone will be described as an example.

  FIG. 7 is a schematic configuration diagram of a digital cellular phone. The digital cellular phone includes a transmission / reception signal transmission unit 102, a reception unit 104, and the like, and a central processing unit (CPU) 106 that controls them is connected to the transmission unit 102 and the reception unit 104. In addition to modulation and demodulation of transmission / reception signals, the CPU 106 controls the information input / output unit 108 including a display unit and operation keys for inputting information, and the memory 110 including RAM, ROM, and the like. For this reason, a piezoelectric vibrator 112 is attached to the CPU 106 and a clock signal output from the piezoelectric vibrator 112 is used. The CPU 106 is connected to a temperature compensated piezoelectric oscillator 114, and the temperature compensated piezoelectric oscillator 114 is connected to the transmitting unit 102 and the receiving unit 104. Thus, even if the basic clock from the CPU 106 fluctuates when the environmental temperature changes, it is corrected by the temperature compensated piezoelectric oscillator 114 and supplied to the transmitting unit 102 and the receiving unit 104. As the piezoelectric vibrator 112, the piezoelectric vibrator 10 described in the first and second embodiments can be used. The temperature compensated piezoelectric oscillator 114 can use the piezoelectric device 50 described in the third embodiment.

  Since the digital cellular phone 100 has been downsized in recent years, a space for mounting electronic devices such as the piezoelectric vibrator 10 (112) and the piezoelectric device 50 (114) is limited. However, since the above-described piezoelectric vibrator 10 can be prevented from rotating in the plane direction when mounted, the distance from the electronic device provided adjacent to the piezoelectric vibrator 10 can be reduced. Therefore, interference with an adjacent electronic device can be prevented, and the space can be saved. Further, the piezoelectric device 50 described above can be miniaturized because the piezoelectric vibrator 10 mounted therein can prevent rotational deviation in the plane direction. For this reason, this piezoelectric device 50 can be mounted in the space.

It is explanatory drawing of a piezoelectric vibrator. It is the top view which showed one intensity | strength holding terminal. It is a top view of a pair of strength holding terminals. FIG. 6 is a bottom view of a piezoelectric vibrator having strength holding terminals provided at opposite corners. It is sectional drawing of a piezoelectric device. It is a top view of the board | substrate which mounted the electronic component. It is a schematic block diagram of a digital mobile phone. It is a top view when the piezoelectric vibrator which concerns on a prior art is mounted in a board | substrate.

Explanation of symbols

10 ......... Piezoelectric vibrator, 12 ......... Piezoelectric vibrator element, 14 ......... Package, 26 ... …… Vibrator terminal, 28 ...... Hot terminal, 30 ......... Strength holding terminal, 32 ......... Join Electrode 34... Inflow electrode 50... Piezoelectric device 52... Substrate 62 62 Electronic component 68 ... Connection member 69 Resin mold material.

Claims (8)

Having a package containing a piezoelectric vibrating piece;
The vibrator terminal provided on the lower surface of the package includes a bonding electrode on which a connection member is disposed, and an inflow electrode connected to the bonding electrode.
A piezoelectric vibrator characterized by that. The vibrator terminal comprises a hot terminal conducted to the piezoelectric vibrating piece, and a strength holding terminal for increasing mounting strength,
Each area of the hot terminal and the strength holding terminal is the same or substantially the same,
The vibrator terminal including the bonding electrode and the inflow electrode is the strength holding terminal.
The piezoelectric vibrator according to claim 1.   The piezoelectric vibrator according to claim 1, wherein the planar shape of the bonding electrode is a circle.   The relationship of (1.0 × L2) <L1 ≦ (1.3 × L2) is satisfied, where L1 is a diameter of the bonding electrode and L2 is a diameter of the connection member. Piezoelectric vibrator.   5. The vibrator terminal including the joining electrode and the inflow electrode is provided at a position facing each other, and the shape of each of the vibrator terminals is symmetric. Piezoelectric vibrator. A piezoelectric vibrator according to any one of claims 1 to 5,
A substrate on which a wiring pattern is formed;
Electronic components disposed on one side of the substrate;
A plurality of connecting members disposed on one surface of the substrate and connecting the piezoelectric vibrator and the substrate with a predetermined interval between the lower surface of the piezoelectric vibrator and the one surface of the substrate When,
A piezoelectric device characterized by comprising: The piezoelectric vibrator according to claim 3,
A substrate on which a wiring pattern is formed;
Electronic components disposed on one side of the substrate;
The piezoelectric vibrator is disposed on a connection member arranging electrode formed on one surface of the substrate, and a predetermined gap is provided between the lower surface of the piezoelectric vibrator and the one surface of the substrate. A plurality of connecting members for connecting the substrate,
The piezoelectric device characterized in that the center of the circular joining electrode of the piezoelectric vibrator and the center of the circular connection member arranging electrode are present at substantially the same position in plan view.   An electronic apparatus comprising the piezoelectric device according to claim 6.

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