Shock-resistant piezoelectric vibrating reed

Abstract

The invention relates to an anti-seismic piezoelectric vibrating reed, and belongs to the technical field of piezoelectric vibrating reeds, the anti-seismic piezoelectric vibrating reed comprises a base part, two sides of the base part are provided with connecting parts, the connecting parts are connected with mounting parts, the base part is also provided with a first vibrating beam and a second vibrating beam, the first vibrating beam and the second vibrating beam are parallel and symmetrically arranged, and the mounting parts are connected with the mounting parts. And a supporting beam is arranged between the base part and the mounting part. The piezoelectric vibrating reed has the effects of improving the structure that the vibrating beam is easy to break and prolonging the service life of the piezoelectric vibrating reed.

Description

Technical Field

[0001] The present application relates to the field of piezoelectric vibration pieces, and in particular to a shock-resistant piezoelectric vibration piece. Background Art

[0002] Piezoelectric vibrating devices, represented by piezoelectric vibrators, are widely used in mobile communication devices such as mobile phones. A tuning-fork piezoelectric vibrating reed is a type of piezoelectric vibrating reed. This reed is shaped like a tuning fork and consists of a base and a pair of vibrating beams extending in one direction from the base.

[0003] As communication equipment becomes more advanced and miniaturized, tuning-fork piezoelectric resonators are also required to be further miniaturized and have higher quality characteristics. In particular, miniaturization of tuning-fork piezoelectric resonators reduces the width and thickness of their vibration beams. This makes the connection between the vibration beam and other structures more susceptible to fracture when subjected to impact loads perpendicular to the main surface of the vibration beam. Summary of the Invention

[0004] In order to improve the structure of the vibration beam that is prone to breakage and extend the service life of the piezoelectric vibration piece, the present application provides a seismic-resistant piezoelectric vibration piece.

[0005] The present application provides an anti-vibration piezoelectric vibrating piece adopting the following technical solution: A seismic-resistant piezoelectric vibration piece includes a base, connecting parts are provided on both sides of the base, a mounting part is connected to the connecting parts, a first vibration beam and a second vibration beam are also provided on the base, the first vibration beam and the second vibration beam are arranged parallel and symmetrically, and a support beam is provided between the base and the mounting part.

[0006] By adopting the above technical solution, the support beam connects the mounting part and the base, thereby providing support for the base and thereby improving the strength of the base. When the vibration beam is subjected to an impact load in the vertical direction, the base can withstand more impact force, reducing the possibility of the base breaking, thereby maintaining the integrity of the piezoelectric vibration piece, and making the piezoelectric vibration piece have good seismic resistance.

[0007] Optionally, along the length direction of the first vibration beam or the second vibration beam, the width of the support beam is greater than or equal to one third of the width of the connecting portion, and the thickness of the support beam is the same as the thickness of the base.

[0008] By adopting the above technical solution, the width of the support beam is not less than one-third of the width of the connecting portion, so that the support beam has sufficient connection strength for connecting the mounting portion and the base, thereby improving the strength of the base.

[0009] Optionally, along the length direction of the first vibration beam or the second vibration beam, the width of the support beam is greater than or equal to two-thirds of the width of the connecting portion, and the thickness of the support beam is the same as the thickness of the base.

[0010] By adopting the above technical solution, the width of the support beam is increased and the support beam is widened, the connection strength of the support beam is further improved, so that the base has stronger earthquake resistance.

[0011] Optionally, multiple levels of support beams are provided between the base and the mounting portion. Along the length direction of the first vibration beam, the width of each level of the support beam is the same and is not less than one-third of the width of the connecting portion, and the distance between two adjacent levels of support beams is greater than the beam width of the support beam.

[0012] By adopting the above technical solution, the installation part and the base are connected by multi-level support beams, the connection points between the installation part and the base are increased, thereby improving the seismic resistance of the base.

[0013] Optionally, driving grooves are provided on both the front and back sides of the first vibration beam, and the two driving grooves are symmetrically arranged. The structure of the second vibration beam is the same as that of the first vibration beam, and driving electrodes are arranged in the driving grooves.

[0014] Optionally, along the thickness direction of the first vibration beam, the depth of the driving groove does not exceed 40% of the thickness of the first vibration beam or the second vibration beam, and along the length direction of the first vibration beam, the length of the driving groove does not exceed 70% of the first vibration beam or the second vibration beam.

[0015] In summary, this application includes at least one of the following beneficial technical effects: The support beam connects the mounting portion and the base, thereby providing support for the base and improving the strength of the base. When the vibration beam is subjected to an impact load in the vertical direction, the base can withstand more impact force, reducing the possibility of base breakage, thereby maintaining the integrity of the piezoelectric vibration piece, and making the piezoelectric vibration piece have good seismic resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a simulation model diagram of the stress concentration area of the piezoelectric vibrating piece in this application.

[0017] Figure 2 It is a schematic diagram of stress peaks at key time nodes in this application.

[0018] Figure 3 This is a graph showing the change of peak stress over time in this application.

[0019] Figure 4 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0020] Figure 5 It is a schematic diagram of stress peaks at different time nodes of the initial structure and the innovative structure in Example 1 of the present application.

[0021] Figure 6 It is a schematic diagram of the overall structure of Example 2 of the present application.

[0022] Figure 7 It is a schematic diagram of the overall structure of Example 3 of the present application.

[0023] Explanation of the accompanying drawings: 1. base; 2. mounting portion; 3. connecting portion; 4. supporting beam; 5. first vibration beam; 6. second vibration beam; 7. driving groove. DETAILED DESCRIPTION

[0024] The present application is further described in detail below with reference to the accompanying drawings.

[0025] The embodiment of the present application discloses a shock-resistant piezoelectric vibration piece.

[0026] Test the breaking point of the initial structure of the piezoelectric vibrating piece in real impact, refer to Figure 1 The stress concentration points of the piezoelectric vibration piece in the simulation results are at the corners and the root of the vibration beam, which are consistent with the breaking points of the piezoelectric vibration piece in the real impact, so the simulation model is reasonable.

[0027] The stress peak at the corner of the piezoelectric vibrating piece is calculated by time stepping. In solid mechanics, base excitation is selected and 100g is input in the Z impact direction. Other settings remain unchanged. When setting the transient modal solver, the solution is first expressed as a superposition of the vibration modes calculated in advance, and then used to calculate the transient response. In addition, it is necessary to enter the load function factor in the modal solver setting window of the transient analysis. All external loads are multiplied by this factor to obtain the effective load size. After solving, it was found that there were 80 solution files that changed with time, and the stress peaks and local stress conditions at the key time nodes of 0.06ms, 0.1ms, 0.14ms, and 0.18ms were extracted.

[0028] Reference Figure 2 The peak volume stress values are 14.85 MPa, 39.98 MPa, 52.28 MPa, and 43.08 MPa, respectively. The volume stress values initially increase and then decrease, indicating a maximum response time point within this time range. Therefore, the volume stress peak values for the 80 solution files were recorded and organized, and their time-varying curves were plotted.

[0029] Reference Figure 3The horizontal axis represents time in milliseconds, while the vertical axis represents the peak volume stress of the QTF at each time point in MPa. The peak volume stress does indeed increase and then decrease over time, reaching a maximum response at 0.015 ms. However, in addition to the first waveform, there are several subsequent waveforms that gradually decay. The plot shows that the peak volume stress of the QTF at the time of maximum response is 52.909 MPa, and residual stress persists even after this point. As the time response gradually approaches zero, the impact pulse ends.

[0030] In order to reduce the stress value at the U-shaped support corner of the piezoelectric vibrating piece, an innovative structure for reinforcing the piezoelectric vibrating piece is proposed. Example 1

[0031] Reference Figure 4 A seismic piezoelectric vibration piece includes a base 1, one side of which is fixedly connected to a pair of vibration beams, which are respectively set as a first vibration beam 5 and a second vibration beam 6. The first vibration beam 5 and the second vibration beam 6 are symmetrically arranged about the center line of the base 1. The first vibration beam 5 and the second vibration beam 6 are both provided with a mounting portion 2 on the side away from each other. A connecting portion 3 is provided between the mounting portion 2 and the base 1 to fix the two. The connecting portion 3 is close to the first vibration beam 5 and the second vibration beam 6. A support beam 4 is provided on one side of the first vibration beam 5 or the second vibration beam 6 , and the support beam 4 is fixedly connected to the base 1 and the mounting portion 2 at the same time.

[0032] Along the length of the first vibration beam 5 or the second vibration beam 6, the width of the support beam 4 is no less than one-third the width of the connecting portion 3, and the thickness of the support beam 4 is the same as the thickness of the base 1. The width of the support beam 4 is no less than one-third the width of the connecting portion 3, so that the support beam 4 has sufficient connection strength to connect the mounting portion 2 and the base 1, thereby ensuring that the base 1 has sufficient seismic strength.

[0033] The support beam 4 connects the mounting portion 2 and the base 1, thereby providing support for the base 1 and improving the strength of the base 1. When the vibration beam is subjected to an impact load in the vertical direction, the base 1 can withstand more impact force, reducing the possibility of the base 1 breaking, thereby maintaining the integrity of the piezoelectric vibration piece, so that the piezoelectric vibration piece has a good anti-seismic effect.

[0034] The first vibration beam 5 is provided with a driving groove 7 on both the front and back sides, and is arranged as a first driving groove 7 and a second driving groove 7. The first driving groove 7 and the second driving groove 7 are symmetrically arranged on the first vibration beam 5. The second vibration beam 6 is also provided with a driving groove 7 on the front and back sides, and is arranged as a third driving groove 7 and a fourth driving groove 7. The third driving groove 7 and the fourth driving groove 7 are symmetrically arranged on the second vibration beam 6. Positive driving electrodes are installed in the first driving groove 7 and the third driving groove 7, and negative driving electrodes are installed in the second driving groove 7 and the fourth driving groove 7.

[0035] Along the thickness direction of the first vibration beam 5 , the depth of the driving groove 7 does not exceed 40% of the thickness of the first vibration beam 5 or the second vibration beam 6 , and along the length direction of the first vibration beam 5 , the length of the driving groove 7 does not exceed 70% of the first vibration beam 5 or the second vibration beam 6 .

[0036] The positive and negative driving electrodes drive the first vibration beam 5 and the second vibration beam 6 to vibrate.

[0037] Reference Figure 5 In the model, a support beam 4 with a size of 20 μm is set between the base 1 and the mounting portion 2, and the distance from the connecting portion 3 is 60 μm, that is, a nearly rectangular protection window is formed at the corner position.

[0038] A geometric model of the innovative structure was established in COMSOL software, and modal analysis and transient dynamic analysis were used to obtain the stress distribution of the resonator and the stress peaks at different time nodes. To highlight the role of the support beam 4 structure, the geometric model of the innovative structure did not consider the H-shaped groove structure. The stress peak data of 80 time nodes were sorted and plotted together with the data of the initial structure. A comparison of the stress peak change curves of the initial structure and the innovative structure over time was obtained. The horizontal axis variable is time, in milliseconds; the vertical axis variable is the QTF body stress peak, in MPa.

[0039] Reference Figure 4 , it can be seen that the peak stress of the innovative structure at maximum response decreased from 52.91 MPa to 37.14 MPa compared to the initial structure. This indicates that the addition of support beams 4 to base 1 effectively reduces peak stress, thereby reducing the likelihood of the resonator fracturing at the corners of the U-shaped structure. This is primarily due to the enhanced impact absorption capability of base 1 after the addition of support beams 4, and the change in the stress distribution during impact.

[0040] The implementation principle of Example 1 is as follows: when the driving electrode drives the first vibration beam 5 and the second vibration beam 6 to vibrate, the support beam 4 connects the mounting portion 2 and the base 1, thereby reducing the possibility of the base 1 being broken due to vibration. Example 2

[0041] Reference Figure 6 This embodiment differs from Example 1 in that multiple levels of support beams 4 are provided between the base 1 and the mounting portion 2. In this embodiment, a two-stage configuration is employed. Along the length of the first vibration beam 5, the width of each level of support beams 4 is identical and no less than one-third the width of the connecting portion 3. Furthermore, the distance between the two levels of support beams 4 is greater than the beam width of the support beams 4. Connecting the mounting portion 2 and the base 1 through the two-stage support beams 4 increases the number of connection points between the mounting portion 2 and the base 1, thereby improving the base 1's seismic resistance. Example 3

[0042] Reference Figure 7 This embodiment differs from Embodiment 1 in that, along the length of the first vibration beam 5 or the second vibration beam 6, the width of the support beam 4 is greater than or equal to two-thirds the width of the connecting portion 3, and the thickness of the support beam 4 is the same as the thickness of the base 1. By increasing the width of the support beam 4 and widening it, the connection strength of the support beam 4 is further improved, making the base 1 more seismic-resistant.

[0043] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A seismic-resistant piezoelectric vibrating piece, characterized in that: The invention comprises a base (1), connecting parts (3) are provided on both sides of the base (1), a mounting part (2) is connected to the connecting parts (3), a first vibration beam (5) and a second vibration beam (6) are provided on the base (1), the first vibration beam (5) and the second vibration beam (6) are arranged in parallel and symmetrically, and a support beam (4) is provided between the base (1) and the mounting part (2).

2. The anti-vibration piezoelectric vibrating piece according to claim 1, characterized in that: Along the length direction of the first vibration beam (5) or the second vibration beam (6), the width of the support beam (4) is greater than or equal to one third of the width of the connecting portion (3), and the thickness of the support beam (4) is the same as the thickness of the base (1).

3. The anti-vibration piezoelectric vibrating piece according to claim 1, characterized in that: Along the length direction of the first vibration beam (5) or the second vibration beam (6), the width of the support beam (4) is greater than or equal to two-thirds of the width of the connecting portion (3), and the thickness of the support beam (4) is the same as the thickness of the base (1).

4. The anti-vibration piezoelectric vibrating piece according to claim 1, characterized in that: Multiple levels of support beams (4) are provided between the base (1) and the mounting portion (2); along the length direction of the first vibration beam (5), the width of each level of the support beams (4) is the same and is not less than one-third of the width of the connecting portion (3); and the distance between two adjacent levels of support beams (4) is greater than the beam width of the support beams (4).

5. The anti-vibration piezoelectric vibrating piece according to claim 1, characterized in that: The front and back surfaces of the first vibration beam (5) are both provided with driving grooves (7), and the two driving grooves (7) are symmetrically arranged. The structure of the second vibration beam (6) is the same as that of the first vibration beam (5), and a driving electrode is arranged in the driving groove (7).

6. The anti-vibration piezoelectric vibrating piece according to claim 1, characterized in that: Along the thickness direction of the first vibration beam (5), the depth of the driving groove (7) does not exceed 40% of the thickness of the first vibration beam (5) or the second vibration beam (6), and along the length direction of the first vibration beam (5), the length of the driving groove (7) does not exceed 70% of the first vibration beam (5) or the second vibration beam (6).

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