JP5413486B2 - Vibrating piece, vibrating device, oscillator, and electronic device - Google Patents

Description

The present invention relates to a resonator element , a vibrating device, an oscillator, and an electronic apparatus .

  The vibrating piece includes a vibrating piece (rectangular vibrating piece) using a flat plate having a rectangular shape in plan view, and a base plate having a thick portion and a thin portion having a rectangular shape in plan view. There is a mesa-type vibrating piece using These vibration pieces excite main vibration, but may also excite unnecessary vibration other than main vibration. Specifically, even when thickness shear vibration is excited as the main vibration, contour vibration and bending vibration are also excited as unnecessary vibration.

  For this reason, in the thickness-slip crystal resonator disclosed in Patent Document 1, in order to suppress the width-slip vibration that is one of the contour vibrations, both ends of the vibrator body are formed into parabolic curves. In addition, Patent Document 1 discloses a thickness-slip crystal resonator using a rectangular resonator body in plan view. However, the matter disclosed in Patent Document 1 is a thick portion of a mesa-type vibrating piece. The same is true for.

  Further, in the mesa-type crystal resonator disclosed in Patent Document 2, in order to suppress bending vibration, the position of the edge of the vibration part and the edge part of the excitation electrode is made to coincide with the position of the antinode of the bending deviation. It is set.

JP 53-45190 A (page 2-3) JP 2006-340023 A (page 3-4)

As described above, the thickness shear vibrator disclosed in Patent Document 1 can suppress the contour vibration, and the mesa crystal vibrator disclosed in Patent Document 2 can suppress the bending vibration. However, the thickness shear vibrator is not designed to suppress bending vibration, and the mesa-type crystal vibrator is not designed to suppress contour vibration. For this reason, the thickness shear vibrator cannot suppress bending vibration, and the mesa crystal vibrator cannot suppress contour vibration. Note that the mesa-type resonator element can increase the effect of confining vibration energy compared to the rectangular resonator element, but it tends to cause contour-type spurious in the thick portion.
Therefore, an object of the present invention is to provide a mesa-type vibrating piece and a mesa-type vibrating device in which contour vibration and bending vibration, which are unnecessary vibrations, are suppressed.

SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.
The resonator element according to the embodiment of the invention includes a first protrusion protruding toward one main surface, and a second protrusion protruding toward the other main surface that is a back surface with respect to the one main surface. A thick portion that excites thickness shear vibration, and a thin portion that is provided integrally with the thick portion along an outer edge of the thick portion and is thinner than the thick portion. Including a base plate, a first excitation electrode provided on a main surface of the first protrusion, and a second excitation electrode provided on a main surface of the second protrusion, the first protrusion At least one of the two first ends crossing the vibration direction of the thickness-shear vibration and facing each other in plan view is a first straight portion that is a straight line; The first convex portion extends from an end portion along the vibration direction of the thickness-shear vibration to the first linear portion, and the vibration direction It includes a first region that intersects the direction crossing the vibration direction in beauty, crossing the vibration direction of the thickness shear vibration of the second convex portions, and the two are opposed in a plan view of the second end At least one of the second end portions is a straight second straight portion and a portion of the second convex portion between the end portion along the vibration direction of the thickness-shear vibration and the second straight portion. Including a second region intersecting with the vibration direction and the direction intersecting with the vibration direction, and the width of the thick portion in the direction intersecting with the vibration direction of the thickness shear vibration is defined as Mz, When the length of the straight line portion and the length of the second straight line portion is M1, the relationship of M1 ≧ Mz / 4 is satisfied .
In the resonator element according to another embodiment of the invention, the first region is provided on both ends of the first straight portion, and the second region is provided on both ends of the second straight portion. It is characterized by being.
In the resonator element according to another embodiment of the present invention, the first linear portion and the first region are provided at the two first ends, and the second linear portion is provided at the two second ends. And the second region.
A resonator element according to another embodiment of the present invention includes at least one of the two electrode end portions of the excitation electrode that intersect the vibration direction of the thickness-shear vibration and face each other in plan view. The extreme portion extends between the electrode linear portion that is a straight line and the electrode end portion along the vibration direction of the thickness shear vibration of the excitation electrode to the electrode linear portion, and the vibration direction and the It includes a region that intersects the direction that intersects the vibration direction .
In the resonator element according to another embodiment of the invention, the first region is provided on both ends of the first straight portion, and the second region is provided on both ends of the second straight portion. The total width of the first region in the direction intersecting the vibration direction of the thickness shear vibration is Mz / 2, and the total width of the second region in the direction intersecting with the vibration direction of the thickness shear vibration. Is Mz / 2.
In a resonator element according to another embodiment of the present invention, the distance between the two first ends and the distance between the two second ends are set to L1, and the wavelength of the bending vibration generated in the base plate Is λ, the L1 is
L1 = (n + 1/2) λ, where n satisfies an integer relationship.
A resonator element according to another embodiment of the present invention includes: one first end portion of the first convex portion in the vibration direction of the thickness shear vibration; one end portion of the first excitation electrode; The other end of one excitation electrode and the other first end of the first convex portion are sequentially arranged on the base plate,
One second end of the second convex portion in the vibration direction of the thickness shear vibration, one end of the second excitation electrode, the other end of the second excitation electrode, and the second convex And the other second end of the part are arranged in order on the base plate,
The distance between the one first end of the first convex portion and the one end of the first excitation electrode, and the one second end of the second convex portion and the second excitation. The distance between the one end of the electrode is L4,
The distance between the other end of the first excitation electrode and the other first end of the first protrusion, and the other end of the second excitation electrode and the second protrusion When the distance between the other second end is L5,
(Mλ / 2) −0.05λ ≦ L4 ≦ (mλ / 2) + 0.05λ, where m is a positive integer,
(Pλ / 2) −0.05λ ≦ L5 ≦ (pλ / 2) + 0.05λ, where p is a positive integer,
L4−L5 = q × λ, where q is an integer,
It is characterized by satisfying the relationship.
Another embodiment of the present invention is a vibrating device including the above-described vibrating piece and a package in which the vibrating piece is accommodated.
Another embodiment of the present invention is an oscillator including the above-described resonator element and a circuit.
Furthermore, another embodiment of the present invention is an electronic device including the above-described vibration piece.
Further, the present invention can employ the following application examples.
[Application Example 1] having a base plate for exciting a thickness shear vibration as a main vibration, comprising a thick part provided with an excitation electrode on a main surface and a thin part provided adjacent to the thick part; At least one of the end portions of the thick portion that intersects the thickness-shear vibration direction is bent with respect to the parallel portion that is parallel to the opposite end portion and the parallel portion. A mesa-type vibrating piece characterized by comprising a bent portion, and satisfying a relationship of Ml ≧ Mz / 4, where Mz is the length of the end of the thick portion, and Ml is the length of the parallel portion. .
By providing a notch at the end of the thick part, a bent part bent with respect to the parallel part can be formed. Since the cutout portion removes the corner of the thick portion in plan view, contour vibration that is unnecessary vibration can be suppressed. Further, the propagation direction of the bending vibration, which is unnecessary vibration, is the same direction as the thickness shear vibration direction. For this reason, the bending vibration can be suppressed by providing the end portion of the thick portion along the direction intersecting the thickness shear vibration direction with a parallel portion having a predetermined length or more.

Application Example 2 The bent portions are provided at both ends of the parallel portion at any one of the end portions, and the total length of the bent portions is set to Mz / 2, or the end portions are provided at both the end portions. The mesa type resonator element according to application example 1, wherein the lengths of the bent portions are Mz / 4, respectively.
When a bent portion is provided at one or both of the end portions of the thick portion along the direction intersecting the thickness shear vibration direction, the length of the bent portion in the direction intersecting the thickness shear vibration direction is set to a predetermined length. Thus, the effect of suppressing contour vibration can be increased.

Application Example 3 When the distance between the end portions of the thick portion is L1, and the wavelength of bending vibration that is unnecessary vibration is λ, the L1 is
L1 = (n + 1/2) λ (n is an integer)
The mesa type resonator element according to Application Example 1 or 2, wherein the relationship is satisfied.
As a result, the positions of the one end and the other end of the thick portion and the antinodes of the bending vibration are aligned, and the direction in which the antinode of the antivibration of the bending vibrations is reversed at the one end and the other end. Therefore, bending vibration can be suppressed.

Application Example 4 One end of the thick part in the thickness shear vibration direction, one end of the excitation electrode, the other end of the excitation electrode, and the other end of the thick part are arranged in this order. The distance between the one end of the thick part and the one end of the excitation electrode is L4, and the other end of the excitation electrode and the other end of the thick part If the distance between and L5 is L5, L4 and L5 are
L4 = (mλ / 2) ± 0.05λ (m is a positive integer)
L5 = (pλ / 2) ± 0.05λ (p is a positive integer)
L4−L5 = q × λ (q is an integer)
4. The mesa resonator element according to any one of application examples 1 to 3, wherein the relationship is satisfied.
As a result, the direction in which the antinode of the bending vibration becomes convex is reversed between one end of the thick portion and one end of the excitation electrode. Further, the direction in which the antinode of the bending vibration becomes convex is reversed between the other end of the thick portion and the other end of the excitation electrode. Thereby, bending vibration can be suppressed.

Application Example 5 The excitation electrode includes an electrode parallel portion in which at least one of the end portions intersecting the thickness-shear vibration direction is parallel to the opposite end portion, and the electrode 5. The mesa type resonator element according to any one of application examples 1 to 4, further comprising an electrode bent portion bent with respect to the parallel portion.
Since the corners of the excitation electrode are removed in plan view, contour vibration, which is unnecessary vibration, can be suppressed. In addition, since the end portion of the excitation electrode along the direction intersecting the thickness shear vibration direction includes an electrode parallel portion having a predetermined length or more, bending vibration can be suppressed.

[Application Example 6] having a base plate that excites thickness shear vibration as main vibration, including a thick part provided with an excitation electrode on a main surface and a thin part provided adjacent to the thick part; At least one of the end portions of the excitation electrode that intersects the thickness-shear vibration direction is bent with respect to the electrode parallel portion that is parallel to the opposite end portion and the electrode parallel portion. A mesa-type vibration comprising: an electrode bending portion, wherein the length of the end portion of the excitation electrode is Ez and the length of the electrode parallel portion is El, and the relationship of El ≧ Ez / 4 is satisfied. Piece.
By providing a notch at the end of the excitation electrode, it is possible to form an electrode bent portion bent with respect to the electrode parallel portion. And since the corner | angular part of the rectangular excitation electrode is removed by the notch part, the contour vibration which is an unnecessary vibration can be suppressed. In addition, since the end portion of the excitation electrode along the direction intersecting the thickness shear vibration direction includes an electrode parallel portion having a predetermined length or more, bending vibration can be suppressed.

  [Application Example 7] A mesa type vibration device characterized in that the mesa type vibration piece according to Application Examples 1 to 6 is housed in a package. Thereby, the mesa-type vibrating piece described above can be stably held. In addition, the mesa type resonator element can be easily mounted on an electronic device.

It is explanatory drawing of the mesa type vibration piece which concerns on 1st Embodiment. It is a top view of a mesa type vibration piece explaining a modification of a thick part. It is a graph which shows the temperature characteristic of CI value. It is a top view of the mesa type vibration piece concerning a 2nd embodiment. It is a top view of the mesa type vibration piece concerning a modification. It is sectional drawing of a mesa type vibration device.

Hereinafter, the best embodiments of the resonator element, the vibration device, the oscillator, and the electronic apparatus according to the invention will be described. First, the first embodiment will be described. FIG. 1 is an explanatory diagram of a mesa-type vibrating piece according to the first embodiment. Here, FIG. 1A is a plan view of a mesa-type vibrating piece, and FIG. 1B is a cross-sectional view taken along the line AA in FIG. Note that the wavy line shown in FIG. 1B indicates a vibration mode of a part of the bending vibration.

The mesa vibrating piece 10 has a base plate 12. The base plate 12 includes a thick portion 14 and a thin portion 16 that is thinner than the thick portion 14. The thin portion 16 is adjacent to the thick portion 14 and is provided at the center of the thick portion 14 in the height direction. As the base plate 12, a piezoelectric base plate or the like can be used. As a specific example of the piezoelectric element plate, a crystal element plate can be cited. In the case where the thickness shear vibration is excited as the main vibration in the mesa-type vibrating piece 10, for example, an AT cut, BT cut, or SC cut crystal element plate may be used as the crystal element plate. Note that the mesa-type vibrating piece 10 may be called a mesa-type piezoelectric vibrating piece when a piezoelectric element plate made of a piezoelectric material is used. In the case where quartz is used as the piezoelectric material, the mesa-type vibrating piece 10 may be called a mesa-type quartz vibrating piece. Such a base plate 12, that is, the thick portion 14 and the thin portion 16 provided around the thick portion 14, can be formed by processing using photolithography and etching.
The mesa-type vibrating piece 10 shown in FIG. 1 has a long side along the X axis and a short side along the Z axis in plan view. When thickness shear vibration is excited in the mesa-type vibrating piece 10, the thickness shear vibration direction is a direction along the X axis.

  The mesa-type vibrating piece 10 has an electrode pattern 20 on the surface of the base plate 12. The electrode pattern 20 includes an excitation electrode 22, a mount electrode 24, and a connection electrode 26. The excitation electrode 22 is provided on the main surface of the thick portion 14. The mount electrode 24 is provided at the corner of the thin portion 16. That is, the mount electrodes 24 are provided at both corners on the proximal end side of the mesa-type vibrating piece 10. The mount electrode 24 is provided on both main surfaces (upper surface and lower surface) and side surfaces of the thin portion 16 at each corner. One of the two mount electrodes 24 is electrically connected to the excitation electrode 22 provided on the upper surface of the base plate 12 via the connection electrode 26. The other mount electrode 24 is electrically connected to the excitation electrode 22 provided on the lower surface of the base plate 12 via the connection electrode 26.

  The electrode pattern 20 can be formed by providing a metal film on the surface of the base plate 12. That is, the electrode pattern 20 is formed by depositing an electrode material (metal) on the base plate 12 exposed at the opening of the mask by depositing a mask on the surface of the base plate 12 and using a film forming method such as vapor deposition or sputtering. Can be formed.

  The mesa-type vibrating piece 10 has a semi-rectangular shape when viewed from above in order to suppress the contour vibration, which is unnecessary vibration. That is, at least one of the two end portions 14a intersecting the thickness-shear vibration direction in the thick portion 14 includes a parallel portion 14b that is parallel to the opposite end portion 14a. A bent portion 14c that is bent with respect to the parallel portion 14b is provided. In the case shown in FIG. 1, the end portion 14a on the distal end side of the mesa-type vibrating piece 10 is parallel to the end portion 14a on the proximal end side, and the parallel portion 14b. And a bent portion 14c that is bent toward the base end side.

  At this time, assuming that the length of the end portion 14a (the width of the thick portion 14) is Mz and the length Ml of the parallel portion 14b, Ml and Mz satisfy the relationship of Ml ≧ Mz / 4. The thick portion 14 shown in FIG. 1 is notched at both ends of the end portion 14a on the tip side of the mesa-type vibrating piece 10 to form bent portions 14c, and is sandwiched between these bent portions 14c. The length of the parallel portion 14b is Ml. In this case, if the total length in the Z-axis direction of each bent portion 14c is Mz / 2, the effect of suppressing contour vibration is enhanced.

  The thick portion 14 may have a shape shown in FIG. 2 or the like in order to suppress contour vibration. FIG. 2 is a plan view of a mesa-type vibrating piece for explaining a modification of the thick portion. In the thick portion 14 of the mesa-type vibrating piece 30 shown in FIG. 2A, the end portion 14a along the Z axis on the distal end side has a semi-pseudo elliptical shape. A parallel portion 14b is provided at the end portion 14a. Further, the thick portion 14 of the mesa-type vibrating piece 32 shown in FIG. 2B is provided with a bent portion 14c at an end portion 14a along the Z-axis on the proximal end side and the distal end side. That is, each end portion 14a is provided with a parallel portion 14b that is parallel to each other, and the bent portion 14c is provided at both ends of the parallel portion 14b. In this case, it is preferable to set the total length in the Z-axis direction of the bent portion 14c provided at each end portion 14a to Mz / 4 because the effect of suppressing contour vibration is enhanced. Further, the thick portion 14 of the mesa-type vibrating piece 34 shown in FIG. 2C is provided with a bent portion 14c at an end portion 14a along the Z axis on the proximal end side and the distal end side. The bent portion 14c is provided at either one of the end portions 14a. Also in this case, it is preferable to set the total length in the Z-axis direction of the bent portion 14c provided at each end portion 14a to Mz / 4 because the effect of suppressing contour vibration is enhanced.

  Further, in the mesa-type vibrating pieces 10, 30, 32, and 34, the dimension of the thick portion 14 and the dimension of the excitation electrode 22 are set to predetermined values in order to suppress bending vibration that is unnecessary vibration. As shown in FIG. 1B, the mesa-type vibrating piece 10 includes one end portion 14a of the thick portion 14 in the X-axis direction (a position indicated by a broken line α) and one end portion 22a of the excitation electrode 22 ( The mesa-type vibrating piece in this order, the other end portion 22a of the excitation electrode 22 (position indicated by the broken line γ) and the other end portion 14a of the thick portion 14 (position indicated by the broken line δ). 10 is arranged along the X-axis from the base end side toward the tip end side. Since the propagation direction of the bending vibration is along the Z-axis, the mesa-type vibrating piece 10 is arranged in the X-axis direction so that the bending vibration and the end portions 14a and 22a are aligned with each other if bending vibration occurs. The thickness of the thick portion 14 and the excitation electrode 22 are set.

  Specifically, in the case shown in FIG. 1B, one end portion 14a of the thick portion 14 located at the position indicated by the broken line α overlaps with an upwardly protruding belly in bending vibration. In addition, one end 22a of the excitation electrode 22 at the position indicated by the broken line β overlaps the belly that protrudes downward in bending vibration. The other end 22a of the excitation electrode 22 at the position indicated by the broken line γ overlaps the antinode that is convex upward in bending vibration. Further, the other end portion 14a of the thick portion 14 at the position indicated by the broken line δ overlaps with a belly that is convex downward in bending vibration. The direction in which the antinodes of the bending vibration become convex may be opposite to that described above.

In other words, this is as follows. First, the distance from one end portion 14a of the thick portion 14 to the other end portion 14a is L1, the distance from one end portion 22a of the excitation electrode 22 to the other end portion 22a is L2, and the X axis of the base plate 12 The dimension in the direction is L3, the distance from one end 14a of the thick portion 14 to one end 22a of the excitation electrode 22 is L4, and the other end 22a of the excitation electrode 22 to the other end of the thick portion 14 The distance to the part 14a is L5. The relationship between one end 22a of the excitation electrode 22 and one end 14a of the thick portion 14 and the relationship between the other end 14a of the thick portion 14 and the other end 22a of the excitation electrode 22 are as follows. The relationship between them satisfies the following formula (1).
L2−L1 = nλ ± 0.1λ (1)
Here, n is a positive integer and λ is the wavelength of bending vibration. This λ satisfies the relationship of λ = 2.6 / F (F is the resonance frequency of the thickness shear vibration generated in the mesa-type vibrating piece 10).

In addition, the relationship shown in the formula (1) preferably satisfies L4 shown in the following formula (2), L5 shown in the following formula (3), and the following formula (4) at the same time.
L4 = (mλ / 2) ± 0.05λ (2)
L5 = (pλ / 2) ± 0.05λ (3)
L4−L5 = q × λ (4)
Here, m and p are positive integers, and q is an integer.

  The dimension L4 between one end portion 14a of the thick portion 14 and one end portion 22a of the excitation electrode 22 and the other end portion 22a of the excitation electrode 22 and the thick portion so as to satisfy such a relationship. When the dimension L5 between the other end 14a of 14 is set, L4 and L5 between these have dimensions obtained by multiplying the half wavelength of the bending vibration by an odd number.

Also, the dimension L1 between the one end 14a and the other end 14a of the thick part 14 only needs to have a dimension obtained by multiplying the half wavelength of the bending vibration by an odd number. That is, the dimension L1 between the one end part 14a and the other end part 14a of the thick part 14 should just satisfy | fill the relationship of the following Formula (5).
L1 = (n + 1/2) λ (5)
Here, n is a positive integer.
Bending vibration is suppressed by setting the dimension of the thick portion 14 and the dimension of the excitation electrode 22 so as to satisfy the above-described relationship.

  Next, the unnecessary vibration suppression effect of the mesa-type vibrating piece 10 will be described. In order to confirm the effect of suppressing unnecessary vibration, a mesa-type vibrating piece 30 as shown in FIG. The mesa-type vibrating piece 30 has a length Mz of the end portion 14a (short side) in the direction along the Z-axis in the thick portion 14 of 0.8 [mm], and a direction along the X-axis in the thick portion 14 The length Mx of the end portion (long side) is 1 [mm]. A plurality of samples having different curvatures R1 of the short side of the thick portion 14 on the tip side of the mesa-type vibrating piece 30 were prepared, and the CI value temperature characteristics were measured. FIG. 3 is a graph showing the temperature characteristics of the CI value. Here, the vertical axis of each figure indicates the CI value, and the horizontal axis indicates the temperature. 3A is R1 = 0 [mm], FIG. 3B is R1 = 0.1 [mm], FIG. 3C is R1 = 0.2 [mm], and FIG. FIG. 3E shows the CI value temperature characteristic when R1 = 0.3 [mm] and R1 = 0.4 [mm].

  When R1 = 0 [mm], the thick portion 14 is rectangular in plan view, and when R1 = 0.4 [mm], a parallel portion parallel to the Z-axis on the short side of the thick portion 14 14b is gone. The CI value in these cases exceeds 50 [Ω] in the high temperature part exceeding 80 ° C. as shown in FIGS. 3 (A) and 3 (E). However, when R1 = 0.1 to 0.3 [mm], there is a parallel portion 14b having a short side of the thick portion 14, and the length of the parallel portion 14b is Mz / 4 to 3Mz / 4. It has become. The CI value in these cases is 50 [Ω] or less at a high temperature portion exceeding 80 ° C. as shown in FIGS. 3 (B) to 3 (D).

  In the case of R1 = 0 [mm] shown in FIG. 3A, the CI value is high due to unnecessary vibration coupled to the main vibration in the range of −40 [° C.] to 40 [° C.]. The unnecessary mode attenuates as the curvature R1 increases.

  From the above, unnecessary vibration can be suppressed if the length of the parallel portion 14b provided on the short side of the thick portion 14 is ¼ or more. Therefore, when the planar view shape of the thick portion 14 is non-rectangular, the two short sides parallel to the Z-axis of the thick portion 14 have a parallel portion 14b and a width Mz of the thick portion 14 in the Z direction. / 4 or more, and preferably Mz / 2 that provides good CI characteristics within a temperature range of -40 ° C to 120 ° C.

  In such mesa-type vibrating pieces 10, 30, 32, 34, the length Ml of the parallel portion 14 b forming the end portion 14 a along the Z axis in the thick portion 14 is 1 / of the width Mz of the thick portion 14. Since four or more are secured, it is possible to suppress flexural vibrations and suppress spurious modes of the contour system.

  Further, the thick portion 14 of the mesa-type vibrating pieces 10, 30, 32, 34 is not circular or elliptical, but has a semi-rectangular shape or a semi-pseudo elliptical shape in plan view. For this reason, the mesa-type vibrating pieces 10, 30, 32, 34 can be easily designed because the thick portion 14 can be designed in a rectangular shape in plan view. If the thick portion 14 is made into a circle or an ellipse in plan view, the design is different from that of a rectangle, and an optimum design with a circle or an ellipse is required.

  In addition, when the length Ml of the parallel part 14b in the thick part 14 is shorter than the length of the excitation electrode 22 in the direction along the Z axis (the width of the excitation electrode 22) Ez, contour vibration can be further suppressed. Further, when the length Ml of the parallel portion 14b in the thick portion 14 is equal to or greater than the length of the excitation electrode 22 in the direction along the Z axis (the width of the excitation electrode 22) Ez, the bending vibration can be further suppressed.

  Next, a second embodiment will be described. FIG. 4 is a plan view of a mesa-type vibrating piece according to the second embodiment. The thick portion 14 of the mesa-type vibrating piece 36 of the second embodiment is rectangular in plan view. In the mesa-type vibrating piece 36, the dimension of the thick portion 14 and the dimension of the excitation electrode 22 are set to predetermined values as described in the first embodiment in order to suppress bending vibration.

  Further, the mesa-type vibrating piece 36 has a semi-rectangular shape when the excitation electrode 22 is viewed in plan view in order to suppress contour vibration that is unnecessary vibration. That is, at least one of the two end portions 22a intersecting the thickness-shear vibration direction of the excitation electrode 22 includes an electrode parallel portion 22b that is parallel to the opposite end portion 22a. An electrode bent portion 22c bent with respect to the electrode parallel portion 22b is provided. In the case shown in FIG. 4, the end 22a on the distal end side of the mesa-type vibrating piece 36 has an electrode parallel portion 22b parallel to the end 22a on the proximal end side, and the electrode parallel portion 22b. On the other hand, an electrode bent portion 22c bent toward the base end side is provided. At this time, when the length of the end portion 22a of the excitation electrode 22 in the Z-axis direction (the width of the excitation electrode 22) is Ez and the length El of the electrode parallel portion 22b, El and Ez satisfy the relationship of El ≧ Ez / 4. It is like that.

  Even in such a mesa-type vibrating piece 36, the length El of the electrode parallel portion 22b along the Z-axis in the excitation electrode 22 is ensured to be 1/4 or more of the width Ez of the excitation electrode 22, so that bending vibration is prevented. In addition to being able to suppress, the spurious mode of the contour system can be suppressed.

  Note that the mesa-type vibrating piece 38 may be a combination of the form described in the first embodiment and the form described in the second embodiment, as shown in FIG. 5 as an example. That is, the mesa-type vibrating piece 38 may combine a form in which the thick portion 14 is made into a semi-rectangular shape and a form in which the excitation electrode 22 is made into a semi-rectangular shape.

  Further, the mesa type resonator element described in the first and second embodiments is a form in which the thick portions 14 are provided on both surfaces of the base plate 12. However, the mesa type resonator element of the present invention may be a plano mesa type in which the thick portion 14 is provided only on one main surface of the base plate 12.

  Next, a third embodiment will be described. In the third embodiment, a mesa vibrating device will be described. FIG. 6 is a cross-sectional view of a mesa type vibration device. In FIG. 6, the description of the electrode pattern provided on the mesa-type vibrating piece is omitted. The mesa vibration device 40 accommodates the above-described mesa vibration pieces 10, 30, 32, 34, 36, and 38 (mesa vibration pieces 10) in a package 42. Specifically, the mesa vibration device 40 includes a package 42. The package 42 has a package base 44 and a lid 54. The package base 44 includes a recessed portion 46 that opens upward, and a pair of package-side mount electrodes 48 are provided on the bottom surface of the recessed portion 46. An external terminal 50 is provided on the back surface of the package base 44 and is electrically connected to the package side mount electrode 48 in a one-to-one relationship. A conductive adhesive 52 is applied on the package-side mount electrode 48, and the mount electrode 24 (not shown in FIG. 5) of the mesa-type vibrating piece 10 is disposed on the conductive adhesive 52. doing. At this time, the package-side mount electrode 48 and the mount electrode 24 of the mesa-type vibrating piece 10 are connected one-to-one via the conductive adhesive 52. A lid 54 is bonded to the upper surface of the package base 44 to hermetically seal the recessed portion 46.

  With such a mesa-type vibrating device 40, the mesa-type vibrating piece 10 can be mounted on an electronic device. Note that the mesa vibration device 40 can be formed not only in the form of the mesa vibrator as described above but also in the form of a mesa oscillator in which the oscillation circuit and the like are housed in the package 42 together with the mesa vibrator element 10.

10, 30, 32, 34, 36, 38 ......... Mesa-type vibrating piece, 12 ......... Unfinished plate, 14 ......... Thick part, 14a ......... End part (thick part), 14b ......... Parallel part, 14c ......... bent part, 16 ......... thin part, 22 ......... excitation electrode, 22a ......... end part (excitation electrode), 22b ......... electrode parallel part, 22c ......... electrode bending part , 40 ... Mesa type vibration device, 42 ... Package.

Claims (10)

Thickness including a first convex portion projecting on one main surface side and a second convex portion projecting on the other main surface side that is the back surface with respect to the one main surface side, and excited by thickness shear vibration And
A thin portion that is provided integrally with the thick portion along the outer edge of the thick portion, and is thinner than the thick portion,
Including a base plate,
A first excitation electrode provided on a main surface of the first convex portion;
A second excitation electrode provided on the main surface of the second convex portion;
Including
Of the first convex portions, at least one of the two first end portions that intersects the vibration direction of the thickness-shear vibration and faces each other in plan view is a straight line. A linear portion, and a portion of the first convex portion that extends from an end portion along the vibration direction of the thickness-shear vibration to the first linear portion, and intersects the vibration direction and the vibration direction. Including a first region that intersects;
Of the second convex portions, at least one second end portion of the two second end portions intersecting with the vibration direction of the thickness-shear vibration and facing each other in plan view is a straight line. Two linear portions and a direction extending from the end of the second convex portion along the vibration direction of the thickness-shear vibration to the second linear portion and intersecting the vibration direction and the vibration direction; Including a second region that intersects,
The width of the thick portion in the direction intersecting the vibration direction of the thickness shear vibration is Mz,
When the length of the first straight portion and the length of the second straight portion are M1,
M1 ≧ Mz / 4
A vibrating piece characterized by satisfying the relationship In claim 1,
The first region is provided on both ends of the first straight portion,
The resonator element according to claim 1, wherein the second region is provided on both ends of the second linear portion. In claim 1 or 2,
The first straight portion and the first region are provided at the two first ends,
The resonator element, wherein the two second end portions are provided with the second linear portion and the second region. In any one of Claims 1 thru | or 3,
Among the excitation electrodes, at least one of the two electrode ends that intersect the vibration direction of the thickness shear vibration and are opposed to each other in plan view is an electrode linear portion that is a straight line, The excitation electrode includes a region extending from an electrode end portion along the vibration direction of the thickness shear vibration to the electrode linear portion and intersecting the vibration direction and a direction intersecting the vibration direction. Characteristic vibrating piece. In any one of Claims 1 thru | or 4 ,
The first region is provided on both ends of the first straight portion;
And when the second region is provided on both ends of the second straight portion,
The total width of the first region in the direction intersecting the vibration direction of the thickness shear vibration is Mz / 2,
The resonator element according to claim 1, wherein the total width of the second region in the direction intersecting with the vibration direction of the thickness shear vibration is Mz / 2. In any one of Claims 1 thru | or 5 ,
The distance between the two first ends and the distance between the two second ends are L1,
When the wavelength of the bending vibration generated in the base plate is λ,
L1 is
L1 = (n + 1/2) λ, where n satisfies an integer relationship. In any one of Claims 1 thru | or 6 ,
One first end of the first convex portion in the vibration direction of the thickness shear vibration, one end portion of the first excitation electrode, the other end portion of the first excitation electrode, and the first convex portion. And the other first end of the part are arranged in order on the base plate,
One second end of the second convex portion in the vibration direction of the thickness shear vibration, one end of the second excitation electrode, the other end of the second excitation electrode, and the second convex And the other second end of the part are arranged in order on the base plate,
The distance between the one first end of the first convex portion and the one end of the first excitation electrode, and the one second end of the second convex portion and the second excitation. The distance between the one end of the electrode is L4,
The distance between the other end of the first excitation electrode and the other first end of the first protrusion, and the other end of the second excitation electrode and the second protrusion When the distance between the other second end is L5,
(Mλ / 2) −0.05λ ≦ L4 ≦ (mλ / 2) + 0.05λ, where m is a positive integer,
(Pλ / 2) −0.05λ ≦ L5 ≦ (pλ / 2) + 0.05λ, where p is a positive integer,
L4−L5 = q × λ, where q is an integer,
A vibrating piece characterized by satisfying the relationship Vibration device comprising: the resonator element according to any one of claims 1 to 7, and packages the resonator element is housed, the. And resonator element according to any one of claims 1 to 7, an oscillator, characterized in that it comprises a a circuit. An electronic apparatus characterized by comprising a resonator element according to any one of claims 1 to 7.