Fork-type crystal vibrating piece and resonator

Abstract

To provide a tuning-fork type crystal vibration piece and a resonator that avoid transmission of energy to a ceramic base and further evade too large total impedance of a device due to vibration leakage.SOLUTION: A turning-fork type crystal vibration piece that includes a crystal vibration piece body 1 and is provided with an energy shunt block 2 protruding outward in an energy transmission path of the crystal vibration piece body 1, is provided additionally with an energy shunt block 2 which protrudes outward at a turning fork fixed block, and when the crystal vibration piece is packaged and fixed to a ceramic base, the energy of the fork is not transmitted downward to a dispensing position of the fixed block, but effectively limited to the domain of the energy shunt block 2.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to the field of quartz, and specifically to a tuning fork type quartz resonator and a resonator.

Background Art

[0002] With the miniaturization and ultra-thinness of communication terminal electronic products, especially due to the strict requirements for the wiring installation space of smart wearable electronic products, miniaturization and ultra-miniaturization are also required for electronic devices. As a tuning fork type quartz resonator generated by a clock signal in an electronic product, the package size is gradually becoming smaller, which also means that the size of the tuning fork type quartz resonator is getting smaller and smaller. Therefore, the conventional machining process is difficult to meet the requirements. For such problems, the QMEMS lithography process is applied to the processing of anisotropic material single crystal SIO2. With the miniaturization of the tuning fork type quartz resonator, the biggest problem currently faced is the impedance problem.

[0003] After designing the tuning fork type quartz piece, it is fixed to the ceramic base with a conductive adhesive, and then vacuum sealing welding is performed on the base. In the design process, generally, the characteristics of the quartz piece are studied, and the vibration amplitude of the tuning fork, the frequency of the tuning fork, and the corresponding vibration impedance are mainly considered. However, finally, the quartz piece is fixed to the ceramic base, and the kinetic energy of the vibrating beam is transmitted along the vibrating beam to the area of the fixed block, resulting in a vibration leakage phenomenon and the overall impedance of the tuning fork being too large.

[0004] The applicant has found that there are at least the following technical problems in the prior art.

[0005] In the prior art, the design of the tuning fork quartz resonator basically focuses on the design of the tuning fork type quartz resonator, and the vibration leakage phenomenon in the packaging process is ignored.

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the prior art, the design of a tuning fork crystal resonator basically focuses on the design of a tuning fork type crystal vibrating piece, and the vibration leakage phenomenon in the packaging process is ignored. To solve this technical problem, the present invention aims to provide a tuning fork type crystal vibrating piece and a resonator. Among various technical solutions according to the present invention, various technical effects brought about by the preferred technical solutions will be described later.

[0007] To achieve the above object, the present invention provides the following technical solutions.

Means for Solving the Problem

[0008] The tuning fork type crystal vibrating piece according to the present invention includes a crystal vibrating piece body, and an energy diversion block protruding outward is provided in the energy transmission path of the crystal vibrating piece body.

[0009] Optionally or preferably, the energy diversion block has at least one sharp corner structure away from the crystal vibrating piece body.

[0010] Optionally or preferably, the shape of the energy diversion block is triangular, rectangular or trapezoidal. When the energy diversion block is triangular, rectangular or trapezoidal, one side of the energy diversion block is in contact with the crystal vibrating piece body.

[0011] Optionally or preferably, at least one energy diversion block is provided on each side of the crystal vibrating piece body.

[0012] Optionally or preferably, one energy diversion block is provided on each side of the crystal vibrating piece body.

[0013] Optionally or preferably, the energy diversion block is provided on the fixed block of the crystal vibrating piece body and is provided close to the vibrating beam of the crystal vibrating piece body.

[0014] Optionally, or preferably, the energy diversion block is integrally structured with the crystal resonator body.

[0015] The resonator according to the present invention includes the above-described tuning fork type crystal resonator.

Advantages of the Invention

[0016] Based on the above technical solution, the embodiments of the present invention can achieve at least the following technical effects.

[0017] (1) According to the tuning fork type crystal resonator of the present invention, an energy diversion block protruding outward is added to the fixed block of the tuning fork type crystal resonator. When the crystal resonator is packaged and fixed to the ceramic base, the energy of the fork can be effectively restricted to the energy diversion block part protruding outward without being transmitted downward to the dispensing position of the fixed block, avoiding the transmission of energy to the ceramic base, and further avoiding the overall impedance of the resonator being too large due to vibration leakage. Compared with the resonator using the notched tuning fork crystal resonator of the prior art, the restricted motion energy of the resonator using the tuning fork type crystal resonator of the present invention is three times that of the resonator using the notched tuning fork type crystal resonator of the prior art, and the effect is more obvious. Further, after packaging the tuning fork type crystal resonator in the present invention and performing impedance analysis by finite elements, the impedance of the resonator using the tuning fork type crystal resonator in the present invention is smaller than that of the resonator using the notched tuning fork type crystal resonator of the prior art.

[0018] (2) According to the resonator of the present invention, since the tuning fork type crystal vibrating piece in the present invention is used, an energy shunt block protruding outward is added to the fixing block of the tuning fork type crystal. When the crystal vibrating piece is packaged and fixed to the ceramic base, the energy of the fork can be effectively restricted to the energy shunt block part protruding outward without being transmitted downward to the dispensing position of the fixing block, avoiding the transmission of energy to the ceramic base, and further avoiding the overall impedance of the resonator becoming too large due to vibration leakage.

[0019] To more clearly explain the embodiments of the present invention or the technical solutions of the prior art, the drawings required for the description of the embodiments or the prior art will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative labor.

Brief Description of the Drawings

[0020]

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Embodiments for Carrying Out the Invention

[0021] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present invention.

[0022] As shown in FIGS. 1 to 27.

[0023] I. Embodiment Embodiment 1

[0024] The present invention provides a tuning fork type crystal vibrating piece according to the present invention, including a crystal vibrating piece body 1, and an energy shunt block 2 protruding outward is provided in the energy transmission path of the crystal vibrating piece body 1.

[0025] As an alternative embodiment, the energy shunt block 2 has at least one sharp corner structure 3 away from the crystal vibrating piece body 1.

[0026] As an alternative embodiment, the shape of the energy shunt block 2 is triangular, rectangular or trapezoidal. When the energy shunt block 2 is triangular, rectangular or trapezoidal, one side of the energy shunt block 2 is in contact with the crystal vibrating piece body 1.

[0027] As an alternative embodiment, at least one energy shunt block 2 is provided on each side of the crystal vibrating piece body 1.

[0028] As an alternative embodiment, one energy shunt block 2 is provided on each side of the crystal vibrating piece body 1.

[0029] As an alternative embodiment, the energy shunt block 2 is provided on the fixed block of the crystal vibrating piece body 1 and is provided close to the vibrating beam of the crystal vibrating piece body 1.

[0030] As an alternative embodiment, the energy shunting block 2 is of an integral structure with the crystal resonator body 1.

[0031] In this embodiment, the structure of the tuning fork crystal resonator includes a fixed block and a pair of vibrating arms symmetrically provided with respect to the central axis of the fixed block. At the end of the vibrating arm of the fixed block away from the vibrating arm, a dispensing and fixing platform for the tuning fork crystal is provided.

[0032] In this embodiment, one energy shunting block 2 is provided on each side of the fixed block of the crystal resonator body 1. The shape is an isosceles triangle and it has a pointed corner structure 3.

[0033] Embodiment 2 The difference between this embodiment and Embodiment 1 is that the shape of the energy shunting block 2 is a right triangle, and one of the right sides is in contact with the crystal resonator body 1. Other than that, it is the same as Embodiment 1.

[0034] Embodiment 3 The difference between this embodiment and Embodiment 1 is that one energy shunting block 2 is provided on each side of the fixed block of the crystal resonator body 1. The shape of the energy shunting block 2 is a rectangle and it has two pointed corner structures 3. Other than that, it is the same as Embodiment 1.

[0035] Embodiment 4 The difference between this embodiment and Embodiment 1 is that two energy shunting blocks 2 are provided on each side of the fixed block of the crystal resonator body 1. The shape of the energy shunting block 2 is a rectangle and it has two pointed corner structures 3. Other than that, it is the same as Embodiment 1.

[0036] Embodiment 5 As a difference between this embodiment and Embodiment 1, three energy shunt blocks 2 are respectively provided on both sides of the fixed block of the crystal vibrating piece body 1. The shape of the energy shunt block 2 is rectangular and has two sharp corner structures 3. Other than that, it is the same as Embodiment 1.

[0037] Embodiment 6 As a difference between this embodiment and Embodiment 1, one energy shunt block 2 is respectively provided on both sides of the fixed block of the crystal vibrating piece body 1. The shape of the energy shunt block 2 is trapezoidal and has two sharp corner structures 3. Other than that, it is the same as Embodiment 1.

[0038] Embodiment 7 As a difference between this embodiment and Embodiment 1, In this embodiment, the structure of the tuning fork type crystal vibrating piece includes a fixed block and a pair of vibrating arms provided symmetrically with respect to the central axis of the fixed block. It further includes a pair of dispensing arms provided on the fixed block and extending in the length direction of the vibrating arms and parallel to the vibrating arms. The dispensing arms are distributed on both sides of the two vibrating arms, and a dispensing platform is provided at the arm end of the dispensing arms, thereby facilitating the dispensing and fixing of the tuning fork type crystal.

[0039] In this embodiment, one energy shunt block 2 is respectively provided on both sides of the fixed block of the crystal vibrating piece body 1. The shape of the energy shunt block 2 is rectangular and has two sharp corner structures 3. Other than that, it is the same as Embodiment 1.

[0040] Embodiment 8 As a difference between this embodiment and Embodiment 1, In this embodiment, the structure of the tuning fork type crystal vibrating piece includes a fixed block and a pair of vibrating arms symmetrically provided with respect to the central axis of the fixed block. It is provided on the fixed block, formed by extending in the length direction of the vibrating arm, and further includes a pair of dispensing arms parallel to the vibrating arm. The dispensing arms are distributed on both sides of the two vibrating arms, and a dispensing platform is provided at the arm end of the dispensing arm, thereby facilitating the dispensing and fixing of the tuning fork type crystal.

[0041] In this embodiment, one energy shunting block 2 is provided on each side of the fixed block of the crystal vibrating piece body 1. The shape of the energy shunting block 2 is an isosceles triangle and has one pointed corner structure 3. Other than that, it is the same as in Embodiment 1.

[0042] Embodiment 9 As the difference between this embodiment and Embodiment 1, In this embodiment, the structure of the tuning fork type crystal vibrating piece includes a fixed block and a pair of vibrating arms symmetrically provided with respect to the central axis of the fixed block. It is provided on the fixed block, formed by extending in the length direction of the vibrating arm, and further includes a pair of dispensing arms parallel to the vibrating arm. The dispensing arms are distributed on both sides of the two vibrating arms, and a dispensing platform is provided at the arm end of the dispensing arm, thereby facilitating the dispensing and fixing of the tuning fork type crystal.

[0043] In this embodiment, one energy shunting block 2 is provided on each side of the fixed block of the crystal vibrating piece body 1. The shape of the energy shunting block 2 is a right triangle, one right side is in contact with the crystal vibrating piece body 1, and it has one pointed corner structure 3. Other than that, it is the same as in Embodiment 1.

[0044] Embodiment 10 As the difference between this embodiment and Embodiment 1, In this embodiment, the structure of the tuning fork type crystal resonator includes a fixed block and a pair of vibrating arms symmetrically provided with respect to the central axis of the fixed block. It is provided on the fixed block, formed by extending in the length direction of the vibrating arms, and further includes a pair of dispensing arms parallel to the vibrating arms. The dispensing arms are distributed on both sides of the two vibrating arms, and a dispensing platform is provided at the arm ends of the dispensing arms, thereby facilitating the dispensing and fixing of the tuning fork type crystal.

[0045] In this embodiment, two energy shunting blocks 2 are respectively provided on both sides of the fixed block of the crystal resonator body 1. The shape of the energy shunting block 2 is rectangular and has two sharp corner structures 3. Other than that, it is the same as in Embodiment 1.

[0046] Embodiment 11 The differences between this embodiment and Embodiment 1 are as follows. In this embodiment, the structure of the tuning fork type crystal resonator includes a fixed block and a pair of vibrating arms symmetrically provided with respect to the central axis of the fixed block. It is provided on the fixed block, formed by extending in the length direction of the vibrating arms, and further includes a pair of dispensing arms parallel to the vibrating arms. The dispensing arms are distributed on both sides of the two vibrating arms, and a dispensing platform is provided at the arm ends of the dispensing arms, thereby facilitating the dispensing and fixing of the tuning fork type crystal.

[0047] In this embodiment, one energy shunting block 2 is respectively provided on both sides of the fixed block of the crystal resonator body 1. The shape of the energy shunting block 2 is trapezoidal and has two sharp corner structures 3. Other than that, it is the same as in Embodiment 1.

[0048] II. Comparative Examples The structural designs of the tuning fork type piezoelectric crystal chips of the SMD3215 specification in the prior art were taken as Comparative Example 1, Comparative Example 2, and Comparative Example 3.

[0049] In Comparative Example 1, Comparative Example 2, and Comparative Example 3, the vibration frequencies of the designed tuning fork type crystal pieces were all 32.768 KHz.

[0050] Comparative Example 1 As shown in FIG. 12, the structure of the tuning fork type crystal includes a fixed block and a pair of vibrating arms provided symmetrically with respect to the central axis of the fixed block. At the end of the fixed block away from the vibrating arms, a dispensing and fixing platform for the tuning fork type crystal is provided.

[0051] Comparative Example 2 As shown in FIG. 12, the structure of the tuning fork type crystal includes a fixed block and a pair of vibrating arms provided symmetrically with respect to the central axis of the fixed block. At the end of the fixed block away from the vibrating arms, a dispensing and fixing platform for the tuning fork type crystal is provided.

[0052] The biggest difference between Comparative Example 1 and Comparative Example 2 is that the total length of the tuning fork is different. When the length A of the fork is the same, this means that the dimensions of the fixed block of the tuning fork are different. In order to achieve that the frequencies of the tuning forks all reach 32.768 KHz, it is necessary to slightly fine-tune the length and width of the vibrating beams of the corresponding tuning forks. The specific outer dimensions of the tuning fork type crystals in Comparative Example 1 and Comparative Example 2 are shown in Table 1 and FIG. 25 below.

[0053]

Table 1

[0054] Comparative Example 3 As shown in FIG. 17, the structure of the tuning fork crystal includes a fixed block and a pair of vibrating arms provided symmetrically with respect to the central axis of the fixed block. At the end of the fixed block away from the vibrating arms, a dispensing and fixing platform for the tuning fork crystal is provided. One notch 4 is provided on each side of the fixed block, and the kinetic energy of the fork is restricted by the notch 4. The specific external dimensions of the tuning fork crystal in Comparative Example 3 are shown in Table 2 and FIG. 26 below.

[0055]

Table 2

[0056] III. Experimental Examples 1. Designed and calculated for Comparative Example 1 and Comparative Example 2 by the finite element method. (1) The calculation model is shown in FIG. 13, and the mesh model is shown in FIG. 14. (2) As a result of designing and calculating by the finite element method, The vibration frequencies of the tuning fork crystal pieces in Comparative Example 1 and Comparative Example 2 both meet the design requirement of 32.768 KHz. The impedances of Comparative Example 1 and Comparative Example 2 are 45 KΩ and 44.8 KΩ respectively, meeting the requirements.

[0057] 2. Under the same conditions, a packaging experiment was simultaneously conducted on the tuning fork crystal pieces in Comparative Example 1 and Comparative Example 2, and the tuning fork resonator was tested with a 250B board.

[0058] As a result of the test, The impedances RR of the crystals in Comparative Example 1 and Comparative Example 2 were 86766.62 Ω and 43181.10 Ω respectively.

[0059] The biggest difference between these two sets of crystal pieces is that the lengths of the two sets of crystal pieces are different. The total length of the crystal piece in Comparative Example 2 is 10 um larger than that in Comparative Example 1, and the length of the fork of the tuning fork in Comparative Example 2 is 17 um shorter than that in Comparative Example 1. This means that the length of the fixed block of the crystal piece in Comparative Example 2 is 27 um longer than that of the fixed block in Comparative Example 1.

[0060] 3. The kinetic energy of the crystal pieces in Comparative Example 1 and Comparative Example 2 was compared by finite element simulation.

[0061] Figure 15 is a kinetic energy diagram for performing finite element simulation on Comparative Example 1, Figure 16 is a kinetic energy diagram for performing finite element simulation on Comparative Example 2.

[0062] As can be seen from the simulation results, the kinetic energy of the tuning fork transmitted to the fixed block in Comparative Example 1 is three times that in Comparative Example 2. Therefore, the dimensions of the fixed block often affect the vibration impedance of the entire device. If the kinetic energy of the tuning fork is better restricted to a local area without transmitting more than necessary to the fixed block, the "vibration leakage phenomenon", which is the energy transmission between the tuning fork and the base, can be avoided. For this reason, it is necessary to design the dimensions of the fixed block to be large during the design process. However, due to the problem of the package dimensions, the dimensions of the fixed block are restricted.

[0063] 4. Comparative Example 3 was calculated by the finite element simulation method. Comparative Example 3 was calculated by the finite element simulation method and compared with the kinetic energy transmission situations of Comparative Example 1 and Comparative Example 2.

[0064] Figure 18 is a time-domain analysis vibration displacement diagram for performing finite element simulation on Comparative Example 3, Figure 19 is a kinetic energy diagram for performing finite element simulation on Comparative Example 3.

[0065] When simulations were conducted, it was clearly discovered that the structure of notch 4 in Comparative Example 3 effectively blocked the kinetic energy of the fork of the tuning fork to the portion above notch 4 before restricting the kinetic energy of the fork of the tuning fork to notch 4. However, compared to the structure where notch 4 is not opened, although the kinetic energy is blocked, the order of the accumulated amount of kinetic energy transmitted from the fork is much larger than that of the structure where notch 4 is not opened. Therefore, such a structural design solves the problem by the "blocking" method.

[0066] 5. According to the dimensions in Table 3 and FIG. 27 below, corresponding finite element modeling was performed for Example 3.

[0067]

Table 3

[0068] FIG. 20 is a mesh model diagram designed and calculated by the finite element method according to the dimensions in Table 2 of Example 3. FIG. 21 is a time-domain analysis vibration displacement diagram obtained by performing finite element simulation according to the dimensions in Table 2 of Example 3. FIG. 22 is an impedance analysis diagram obtained by performing finite element simulation according to the dimensions in Table 2 of Example 3. FIG. 23 is a kinetic energy diagram obtained by performing finite element simulation according to the dimensions in Table 2 of Example 3.

[0069] Through the above analysis, by adding the energy diversion block 2 to the fixed block of the tuning fork, the kinetic energy of the fork can be effectively restricted to the part of the energy diversion block 2 without transmitting it to the position of the dispensing platform below, and it is shown that transmitting it onto the ceramic base can avoid the overall impedance of the device being too large. Compared with the tuning fork crystal resonator with the notch 4 in Comparative Example 3, the restricted kinetic energy of the resonator using the tuning fork type crystal resonator in Example 3 is three times that of the resonator using the tuning fork type crystal resonator in Comparative Example 3, and the effect is more obvious. In addition, impedance analysis was performed on the tuning fork crystal piece in Example 3 by finite elements, and the obtained impedance value was 38 KΩ, while the impedance value in Comparative Example 3 was 42 KΩ, and the impedance value in Example 3 was lower.

[0070] 6. Finite element simulation modeling was performed on Comparative Examples 1 - 3 and Examples 1 - 11 respectively. The restricted kinetic energy of the tuning fork crystal resonator and the resulting impedance value of the crystal piece are shown in Table 4 below.

[0071]

Table 4

[0072] As can be seen from Table 4, the restricted motion energy of the resonators using the tuning fork type crystal resonators in Examples 1 to 11 of the present invention is much larger than that of the resonators of the tuning fork type crystal resonators in Comparative Examples 1 to 3. Moreover, when impedance analysis was performed on the tuning fork crystal resonators in Examples 1 to 11 and Comparative Examples 1 to 3 by the finite element method, the impedance values of the tuning fork crystal resonators in Examples 1 to 11 were lower. In Examples 1 to 11 of the present invention, an energy shunt block 2 protruding outward is added to the fixed block of the crystal resonator body 1. When the crystal resonator is packaged and fixed to the ceramic base, the energy of the fork can be effectively restricted to the part of the energy shunt block 2 protruding outward without transmitting it downward to the dispensing position of the fixed block, avoiding the energy being transmitted to the ceramic base, and further avoiding the overall impedance of the device being too large due to vibration leakage.

[0073] As described above, the specific embodiments of the present invention have been described. However, the protection scope of the present invention is not limited thereto, and all changes and substitutions that can be easily conceived by those skilled in the art without departing from the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Explanation of Reference Numerals

[0074] 1. Crystal resonator body 2. Energy shunt block 3. Sharp corner structure 4. Notch

Claims

1. A tuning fork type crystal resonator including a crystal resonator body (1), wherein an energy shunt block (2) protruding outward is provided in an energy transmission path of the crystal resonator body (1). The shape of the energy shunt block (2) is triangular or trapezoidal. A tuning fork type crystal resonator, wherein one side of the energy shunt block (2) is in contact with the crystal resonator body (1).

2. A tuning fork type crystal resonator including a crystal resonator body (1), wherein an energy shunt block (2) protruding outward is provided in an energy transmission path of the crystal resonator body (1). A fixed block, A pair of vibrating arms provided symmetrically with respect to a central axis of the fixed block, A pair of dispensing arms provided on the fixed block, extending in a longitudinal direction of the vibrating arms, and parallel to the vibrating arms, The dispensing arms are distributed on both sides of the pair of vibrating arms, A tuning fork type crystal resonator, wherein at least one energy shunt block (2) is provided on each side of the fixed block.

3. A tuning fork type crystal resonator including a crystal resonator body (1), wherein an energy shunt block (2) protruding outward is provided in an energy transmission path of the crystal resonator body (1). A tuning fork type crystal resonator, wherein a plurality of energy shunt blocks (2) are provided on each side of the crystal resonator body (1).

4. The tuning fork type crystal resonator according to any one of claims 1 to 3, wherein the energy shunt block (2) has at least one sharp corner structure (3) away from the crystal resonator body (1).

5. The tuning fork type crystal resonator according to any one of claims 1 to 3, wherein the energy shunt block (2) is provided on a fixed block of the crystal resonator body (1) and is provided close to a vibrating beam of the crystal resonator body (1).

6. The tuning fork type crystal resonator according to any one of claims 1 to 3, wherein the energy shunt block (2) has an integral structure with the crystal resonator body (1).

7. A resonator, comprising the tuning fork type crystal resonator according to any one of claims 1 to 3.

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