Quartz crystal resonator applied to intelligent wearing

Abstract

The utility model discloses a quartz crystal resonator applied to intelligent wearing, which relates to the technical field of quartz crystal resonators, and comprises a base, a silver ring plane and a metal cover plate, the base is arranged below the metal cover plate, the silver ring plane is arranged on the side to form a closed cavity, the bottom of the base is connected with a bonding pad, and the bonding pad is connected with the metal cover plate. A quartz wafer is connected to the position, above the base, in the closed cavity through a coating area and a metal supporting platform, the upper face of the quartz wafer is coated with a first metal thin film, and the lower face of the quartz wafer is coated with a second metal thin film. The first metal film is larger than the second metal film and covers the second metal film. According to the utility model, the upper and lower electrode surfaces with different sizes are designed, and the effective electrode surfaces are ensured to be stable and unchanged, so that the consistency of C0, C1 and TS values of a product is ensured, and the technical problems that the consistency of the C0, C1 and TS values of the product is insufficient due to assembly tolerance and the performance of the product is influenced are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of quartz crystal resonators, and in particular to a quartz crystal resonator applied to smart wearables. Background Art

[0002] With the rapid development of mobile Internet, smart wearable health products, like smart phones, have gradually changed from a few elites to a must-have in the lives of the general public. Smart phones meet people's needs to obtain and share information anytime, anywhere, and at will, and smart wearable health products may become more important in the coming big data era, especially smart watches, which have been recognized by the majority of users. With the continuous development of technology, smart watches are getting smaller and thinner. As a result, the requirements for quartz crystals are getting higher and higher. Not only does the product size need to be miniaturized, but the requirements for product stability and consistency are also getting higher and higher. Limited by the uneven accuracy of the various capacitors, resistors, and distributed resistors on the smart watch module, compared with large-size specifications, small-size products have more stringent requirements for the consistency of frequency under changes in ambient temperature and product C0, C1 and TS values. Miniaturization and accuracy issues will directly lead to increased frequency dispersion or frequency over-limit after the product is mounted on the board, resulting in signal loss. TS: traction, sensitivity (the change in FL for every 1pF change in load capacitance, unit: ppm / pF), C1: dynamic capacitance, C0: static capacitance, TS = C1*500 / ((C0+pF)*(C0+pF)). When manufacturing a quartz crystal resonator, two electrode surfaces are provided on the upper and lower parts of the quartz crystal. According to the machining tolerance of the coating fixture, the positioning pins and positioning holes have tolerances respectively. Therefore, it is easy to cause the upper and lower electrode surfaces to be misaligned during the assembly process, and the effective area of ​​the electrode will be reduced, resulting in insufficient consistency in the product C0, C1 and TS values, affecting product performance. Utility Model Content

[0003] Technical problems to be solved by utility models

[0004] In response to the technical problem of insufficient consistency of existing small-sized quartz crystal resonators, the utility model provides a quartz crystal resonator for use in smart wearables, which is designed with upper and lower electrode surfaces of different sizes to ensure that the effective electrode surface is stable and unchanged, thereby ensuring the consistency of the product's C0, C1 and TS values, and solving the technical problem of insufficient consistency of the product's C0, C1 and TS values ​​due to assembly tolerances, which affects product performance.

[0005] Technical Solution

[0006] In order to solve the above problems, the technical solution provided by the utility model is:

[0007] A quartz crystal resonator for smart wearables comprises a base, a silver ring plane and a metal cover plate, wherein the base is at the bottom, the metal cover plate is at the top, and the silver ring plane is at the side, forming a closed cavity, the bottom of the base is connected to a pad, a quartz wafer is connected above the base and in the closed cavity through a coating area and a metal support platform, the top of the quartz wafer is coated with a first metal film, the bottom of the quartz wafer is coated with a second metal film, the first metal film is larger than the second metal film and the first metal film covers the second metal film.

[0008] The first metal film is larger than the second metal film and covers the second metal film. Even if the fixture has deviations, it can ensure that the second metal film, i.e., the small electrode surface, does not exceed the first metal film, i.e., the large electrode surface, thereby ensuring that the effective electrode surface remains unchanged and improving the consistency of the product's electrical characteristics C0, C1 and TS values.

[0009] Optionally, the edge spacing between the first metal film and the second metal film is greater than the machining tolerance of the coating fixture.

[0010] Optionally, the quartz wafer is mounted on a metal support platform and a coating area, the coating area is coated with conductive glue, and the quartz wafer is connected to the coating area through the conductive glue.

[0011] The quartz crystal resonator is designed with conductive glue connection through the metal support platform and the coating area, which not only ensures the stable operation of the quartz crystal, but also improves the consistency and stability of the entire resonator. This design makes this quartz crystal resonator have a wide range of application prospects in the field of electronic equipment.

[0012] Optionally, the pad is a silver-plated pad.

[0013] Optionally, the pad includes at least two non-communicating silver coatings, and the two silver coatings are respectively connected to two electrodes of the quartz wafer.

[0014] The special feature of this pad is that it contains at least two non-interconnected silver coatings. This design not only ensures the independence and stability of the electrical connection, but also improves the signal transmission efficiency of the entire resonator. Each silver coating is carefully crafted to ensure precise docking with the two electrodes of the quartz crystal, thereby achieving fast and accurate signal transmission.

[0015] Optionally, a plurality of test points are evenly arranged on both the front and back surfaces of the quartz wafer, and the angle difference between the corresponding test points on the front and back surfaces is less than 30 seconds.

[0016] Optionally, the dispersion of the cutting angle of the quartz wafer is less than 15 seconds.

[0017] By setting test points and multiple test screenings, the quartz chip ensures that when the ambient temperature changes between 0 and 50 degrees, the relative change of its resonant frequency Δf / f will be within ±1.5ppm, and its stability and consistency of electrical characteristics are greatly improved.

[0018] The distance between the second metal film and the base is greater than 0.01 mm.

[0019] A certain gap is ensured between the second metal film and the base to avoid affecting the performance of the quartz crystal resonator.

[0020] Beneficial Effects

[0021] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0022] In the technical solution provided by the utility model, the quartz wafer is the core component of the resonator, and a first metal film is coated on the top and a second metal film is coated on the bottom. This double-layer metal film design not only enhances the conductivity of the quartz wafer, but also improves its vibration efficiency. It is worth noting that the area of ​​the first metal film is larger than that of the second metal film, and the first metal film completely covers the second metal film. This design not only optimizes the vibration mode of the quartz crystal, but also improves the consistency and stability of its operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a quartz crystal resonator applied to smart wearable devices proposed in an embodiment of the utility model;

[0024] Figure 2 One of the implementation methods of a quartz crystal resonator applied to smart wearables proposed in the embodiment of the utility model;

[0025] Figure 3 This is a second implementation of a quartz crystal resonator applied to smart wearable devices proposed in an embodiment of the utility model;

[0026] Figure 4 A schematic diagram of a quartz crystal resonator applied to smart wearable devices proposed in an embodiment of the utility model;

[0027] 1. Base; 2. Coating area; 3. Metal support platform; 4. Quartz wafer; 5. First metal film; 6. Second metal film; 7. Conductive glue; 8. Silver ring plane; 9. Metal cover; 10. Solder pad. DETAILED DESCRIPTION

[0028] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0029] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings. The words "first", "second", etc. described in the present utility model are set for the convenience of describing the technical solution of the present utility model, and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments in the present application can be combined with each other. In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, and multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts, all of which are within the scope of protection required by the present utility model.

[0030] Example

[0031] Combined with Figure 1-4 A quartz crystal resonator for smart wearables comprises a base 1, a silver ring plane 8 and a metal cover plate 9, wherein the base 1 is at the bottom, the metal cover plate 9 is at the top, and the silver ring plane 8 is at the side, forming a closed cavity, wherein the bottom of the base 1 is connected to a pad 10, and a quartz wafer 4 is connected above the base 1 and in the closed cavity through a coating area 2 and a metal support platform 3, wherein a first metal film 5 is coated on the top of the quartz wafer 4, and a second metal film 6 is coated on the bottom of the quartz wafer 4, wherein the first metal film 5 is larger than the second metal film 6 and the first metal film 5 covers the second metal film 6.

[0032] The special design of the chip electrode surface makes the consistency of C0, C1 and TS values ​​higher. The quartz chip 4 can achieve high-precision and high-stability frequency output after being mounted and at different temperatures. In the processing of metal films, a high degree of professionalism and precision are demonstrated. The top of the quartz chip 4 is coated with a first metal film 5, and the bottom is coated with a second metal film 6. The first metal film 5 is not only larger in area than the second metal film 6, but also completely covers the second metal film 6. This design strategy provides guarantees for the performance and stability of the product in many aspects.

[0033] First, the first metal film 5 completely covers the second metal film 6, ensuring that even if there is a slight deviation in the fixture during the manufacturing process, the second metal film 6 (i.e., the small electrode surface) will not exceed the range of the first metal film 5 (i.e., the large electrode surface). This design effectively avoids the problem of irregular or misaligned electrode surfaces caused by manufacturing errors, thereby ensuring the stability and consistency of the effective electrode surface.

[0034] Secondly, due to the stability of the effective electrode surface, the electrical characteristics of the quartz crystal resonator, such as C0, C1 and TS value, can also be well guaranteed. C0 represents the static capacitance of the resonator, C1 is closely related to the frequency stability of the resonator, and the TS value reflects the temperature stability of the resonator. The consistency of these electrical characteristics is crucial to the performance of the resonator, and this design improves the consistency of these characteristics by optimizing the structure of the electrode surface.

[0035] Finally, this design also improves product reliability and durability. Since the stability and consistency of the electrode surface are guaranteed, the resonator can maintain stable performance during long-term use, reducing the risk of performance degradation or failure due to electrode surface problems.

[0036] In summary, this quartz crystal resonator ensures the stability and consistency of the effective electrode surface by optimizing the design of the metal film, thereby improving the consistency of the product's electrical characteristics C0, C1 and TS values, providing a strong guarantee for the high-performance operation of electronic equipment.

[0037] The first metal film 5 is larger than the second metal film 6 and the first metal film 5 covers the second metal film 6. Even if the fixture has deviations, it can ensure that the second metal film 6, i.e. the small electrode surface, does not exceed the first metal film 5, i.e. the large electrode surface, thereby ensuring that the effective electrode surface remains unchanged and improving the consistency of the product's electrical characteristics C0, C1 and TS values.

[0038] The edge spacing between the first metal film 5 and the second metal film 6 is greater than the machining tolerance of the coating fixture. In this embodiment, the machining tolerance of the coating fixture, the positioning pin and the positioning hole have a tolerance of 0.01mm respectively, and the total maximum tolerance is 0.02mm, so it is easy to cause the upper and lower electrode surfaces to be misaligned during the assembly process, and the effective area of ​​the electrode will be reduced, thereby affecting the consistency of the electrical characteristics C0 and C1 values. The spacing between a and b is designed to be 0.03mm, so that under the maximum deviation of the fixture, it can also ensure that the small electrode surface does not exceed the large electrode surface, and the effective electrode surface is guaranteed to remain unchanged, thereby improving the consistency of the electrical characteristics C0 and C1 values.

[0039] The quartz wafer 4 is mounted on the metal support platform 3 and the coating area 2 . The coating area 2 is coated with a conductive adhesive 7 . The quartz wafer 4 is connected to the coating area 2 through the conductive adhesive 7 .

[0040] The quartz crystal resonator is connected by the metal support platform 3 and the conductive glue 7 of the coating area 2, which not only ensures the stable operation of the quartz crystal wafer 4, but also improves the consistency and stability of the entire resonator. This design makes this quartz crystal resonator have a wide range of application prospects in the field of electronic equipment.

[0041] The pad 10 is a silver-plated pad 10 .

[0042] The pad 10 includes at least two incommunicative silver coatings, and the two silver coatings are respectively connected to two electrodes of the quartz wafer 4 .

[0043] The special feature of this pad 10 is that it includes at least two non-interconnected silver coatings. This design not only ensures the independence and stability of the electrical connection, but also improves the signal transmission efficiency of the entire resonator. Each silver coating is carefully made to ensure precise docking with the two electrodes of the quartz crystal 4, thereby achieving fast and accurate signal transmission.

[0044] The front and back sides of the quartz wafer 4 are provided with multiple test points uniformly, and the angle difference between the corresponding test points on the front and back sides is less than 30 seconds. Under a specific ambient temperature (0 to 50 degrees Celsius), the feeding angle of the quartz wafer 4 and the accuracy of the angle difference between the two sides are controlled by selecting the cutting angle. In the orientation of the quartz crystal, when the quartz crystal is subjected to a force along the X-axis direction, a piezoelectric effect is generated in the X direction, while no piezoelectric effect is generated in the Y and Z directions. When the quartz crystal is subjected to a force along the Y-axis direction, a piezoelectric effect is generated in the X direction, while no piezoelectric effect is generated in the Y and Z directions. If a force is applied along the Z-axis direction, no piezoelectric effect is generated. Therefore, the X-axis is also called the electrical axis and the Y-axis is called the mechanical axis. Although the quartz crystal has a birefringence phenomenon, when light is incident along the Z-axis direction, no birefringence occurs, so the Z-axis is the optical axis. In this cutting method, the angle between the wafer surface and the optical axis is maintained at about 35 degrees for 20 seconds, and at the same time, a pair of parallel edges are parallel to the electrical axis. Due to the anisotropy of piezoelectric quartz crystals, the frequency of the thickness shear resonance mode of the quartz crystal wafer 4 cut in certain directions will change greatly with the change of ambient temperature, while the frequency of the thickness shear resonance mode of the quartz crystal wafer 4 cut in other directions will change little with the change of ambient temperature. Figure 2 , find the best cutting angle, that is, the center angle curve satisfies ±0.8ppm at each temperature point in the range of 0 to 50 degrees. The cutting process is completed into a rectangular quartz wafer 4 of 29.5*25.5mm, such as Figure 3 As shown. At the same time, in order to ensure the consistency and high precision of frequency change, the angles of 5 points on both sides of the quartz wafer 4 are measured and compared one by one, and the quartz wafer 4 with an angle difference of less than 30 seconds is selected. Then the selected quartz wafer 4 is sorted in the angle selector, and the dispersion of the cutting angle must be controlled within 15 seconds to ensure that the relative change Δf / f of the resonant frequency will be within ±1.5ppm when the ambient temperature changes between 0 and 50 degrees.

[0045] By setting test points and multiple test screenings, the quartz crystal 4 ensures that when the ambient temperature changes between 0 and 50 degrees, the relative change Δf / f of its resonant frequency will be within ±1.5ppm, and its stability and consistency of electrical characteristics are greatly improved.

[0046] The distance between the second metal film 6 and the base 1 is greater than 0.01 mm.

[0047] A certain gap is ensured between the second metal film 6 and the base 1 to avoid affecting the performance of the quartz crystal resonator.

[0048] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A quartz crystal resonator for smart wearable devices, characterized in that: It includes a base, a silver ring plane and a metal cover plate, wherein the base is at the bottom, the metal cover plate is at the top, and the silver ring plane is at the side, forming a closed cavity, the bottom of the base is connected to the pad, a quartz wafer is connected above the base and in the closed cavity through a coating area and a metal support platform, the top of the quartz wafer is coated with a first metal film, the bottom of the quartz wafer is coated with a second metal film, the first metal film is larger than the second metal film and the first metal film covers the second metal film.

2. A quartz crystal resonator for smart wearable devices according to claim 1, characterized in that: The edge spacing between the first metal film and the second metal film is greater than the machining tolerance of the coating fixture.

3. The quartz crystal resonator for smart wearable devices according to claim 1, characterized in that: The quartz wafer is mounted on a metal support platform and a coating area, the coating area is coated with conductive glue, and the quartz wafer is connected to the coating area through the conductive glue.

4. The quartz crystal resonator for smart wearable devices according to claim 1, characterized in that: The pad is a silver-plated pad.

5. A quartz crystal resonator for smart wearable devices according to claim 4, characterized in that: The pad comprises at least two incommunicative silver coatings, and the two silver coatings are respectively connected to two electrodes of the quartz wafer.

6. The quartz crystal resonator for smart wearable devices according to claim 1, characterized in that: The front and back surfaces of the quartz wafer are evenly provided with a plurality of test points, and the angle difference between the corresponding test points on the front and back surfaces is less than 30 seconds.

7. A quartz crystal resonator for smart wearable devices according to claim 6, characterized in that: The dispersion of the cut angle of the quartz wafer is less than 15 seconds.

8. The quartz crystal resonator for smart wearable devices according to claim 1, characterized in that: The distance between the second metal film and the base is greater than 0.01 mm.

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