Miniaturized low frequency quartz crystal resonator with high mechanical strength

Abstract

This utility model relates to a miniaturized low-frequency quartz crystal resonator with strong mechanical strength. The quartz crystal resonator includes a ceramic base, a metal cover, and a quartz crystal. The ceramic base has an inner cavity, the upper opening of which is sealed by the metal cover into a closed chamber. Two L-shaped electrodes are arranged side by side at the bottom of the inner cavity. Each L-shaped electrode has a notch, and a quartz crystal is placed at the notch of the two L-shaped electrodes. A first adhesive dot, made of conductive silver paste, is placed on the lower end of the quartz crystal and the bottom surface of the notch. A second adhesive dot, made of epoxy resin, is placed between the upper end of the L-shaped electrodes and the quartz crystal. An external electrode, connected to the L-shaped electrodes, is located at the lower end of the ceramic base. This utility model enhances mechanical strength and improves the product's drop resistance by changing the internal electrode structure and adhesive dispensing structure of the ceramic base, effectively solving the problem of quartz crystal detachment caused by insufficient mechanical strength.

Description

Technical Field

[0001] This utility model relates to the field of electronic components technology, and in particular to a miniaturized low-frequency quartz crystal resonator with strong mechanical properties. Background Technology

[0002] Quartz crystal resonators are devices that utilize the principle that the crystal resonates due to the piezoelectric effect when the frequency of an electrical signal equals the natural frequency of the crystal. Their main functions in electronic devices include generating stable clock signals, frequency stabilization, and signal filtering.

[0003] In recent years, smart wearable devices, as an important area where modern technology intersects with daily life, have shown significant growth. According to market research data, the global smart wearable device market is expected to exceed $100 billion in 2024, showing double-digit year-on-year growth. Crystal resonators, as components providing stable clock signals for the Bluetooth function of smart wearables, are required not only to be miniaturized and operate at low frequencies, but also to possess strong drop resistance to ensure the high quality of the devices. For miniaturized low-frequency quartz crystal resonators, due to their frequency requirements, quartz wafers naturally have the characteristics of large thickness and poor mechanical strength. Therefore, it is necessary to optimize existing dispensing structures, electrodes, and other structures to enhance the mechanical capabilities of the quartz crystal resonator. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a miniaturized low-frequency quartz crystal resonator with strong mechanical strength. By changing the internal electrode structure and dispensing structure of the ceramic base, the mechanical strength is enhanced, the drop resistance of the product is improved, and the problem of quartz crystal delamination caused by low mechanical strength is effectively solved.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a miniaturized low-frequency quartz crystal resonator with strong mechanical strength is provided. The quartz crystal resonator includes a ceramic base, a metal cover and a quartz crystal. The ceramic base has an inner cavity. The upper opening of the inner cavity is sealed by the metal cover to form a closed chamber. Two L-shaped electrodes are arranged side by side at the bottom of the inner cavity. The L-shaped electrodes have a notch. A quartz crystal is placed at the notch of the two L-shaped electrodes. A first adhesive dot is provided at the lower end of the quartz crystal and the bottom surface of the notch. The first adhesive dot is made of conductive silver paste. A second adhesive dot is provided between the upper end of the L-shaped electrode and the quartz crystal. The second adhesive dot is made of epoxy resin. An external electrode connected to the L-shaped electrode is provided at the lower end of the ceramic base.

[0006] As a supplement to the technical solution described in this utility model, a symmetrical electrode surface is provided in the middle of both the upper and lower ends of the quartz wafer, and the symmetrical electrode surfaces on the upper and lower sides are connected and conductive through conductive leads installed on the side of the quartz wafer.

[0007] As a supplement to the technical solution described in this utility model, the height of the L-shaped electrode is 105~115μm, and the distance between the bottom surface of the notch and the lower end surface of the L-shaped electrode is 15~25μm.

[0008] As a supplement to the technical solution described in this utility model, the frequency of the quartz crystal resonator is 24MHz.

[0009] As a supplement to the technical solution described in this utility model, the thickness of the quartz wafer is 85~91μm.

[0010] As a supplement to the technical solution described in this utility model, the conductive leads and electrode surfaces are both two-layer structures of chromium and silver, with the inner layer being chromium and the outer layer being silver, and the chromium being connected to the quartz crystal.

[0011] Beneficial Effects: This utility model relates to a miniaturized low-frequency quartz crystal resonator with strong mechanical strength. Compared with existing miniaturized low-frequency quartz crystal resonators, it has the following advantages and positive effects: Due to limitations in product size and application requirements, quartz crystal resonators must adopt a low-frequency design. To meet these requirements, the quartz crystal wafers used are naturally larger and thicker, resulting in relatively poor mechanical strength. This utility model changes the internal electrode structure and dispensing structure of the ceramic base. The internal electrode of the ceramic base is designed as an L-shaped electrode. The bottom surface of the L-shaped electrode is connected to the quartz crystal wafer using conductive silver paste, which enables the circuit connection between the quartz crystal wafer and the internal electrode. The upper surface of the L-shaped electrode is connected to the quartz crystal wafer using epoxy resin adhesive. Due to its high adhesion performance, it provides great mechanical strength, increasing the product's drop resistance from 50 times to over 300 times, effectively solving the problem of quartz crystal wafer delamination caused by low mechanical strength. Meanwhile, because the epoxy resin adhesive on the upper surface is an insulator, it effectively and completely avoids the risk of short circuit when the adhesive dots on the upper surface come into contact with the metal cover due to the double coating and dispensing of adhesive in low-frequency miniaturized products. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the present invention; Figure 2 This is a utility model Figure 1 A magnified view of a portion of the image; Figure 3 This is a top view of the inner cavity of the ceramic base described in this utility model. Figure 4 This is a top view of the quartz wafer after coating according to this utility model; Figure 5 This is a cross-sectional view of the quartz wafer after coating according to this utility model.

[0013] Illustration: 1. Ceramic base, 2. Metal top cover, 3. Quartz wafer, 4. L-shaped electrode, 5. First coating adhesive dot, 6. Second coating adhesive dot, 7. External electrode, 8. Electrode surface, 9. Conductive lead, 10. Notch. Detailed Implementation

[0014] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0015] The embodiments of this utility model relate to a miniaturized low-frequency quartz crystal resonator with strong mechanical properties, such as... Figure 1-5 As shown, the quartz crystal resonator includes a ceramic base 1, a metal cover 2, and a quartz crystal 3. The ceramic base 1 has an inner cavity, the upper opening of which is sealed by the metal cover 2. Two L-shaped electrodes 4 are arranged side by side at the bottom of the inner cavity. Each L-shaped electrode 4 has a notch 10. A quartz crystal 3 is placed at the notch 10 of the two L-shaped electrodes 4. A first adhesive dot 5 is provided at the lower end of the quartz crystal 3 and the bottom surface of the notch 10. The first adhesive dot 5 is made of conductive silver paste, which is characterized by high conductivity and high stability. A second adhesive dot 6 is provided between the upper end of the L-shaped electrode 4 and the quartz crystal 3. The second adhesive dot 6 is made of epoxy resin, which is characterized by high adhesion and low internal stress. An external electrode 7 connected to the L-shaped electrode 4 is provided at the lower end of the ceramic base 1.

[0016] The quartz wafer 3 has a symmetrical electrode surface 8 at the middle of both the upper and lower ends, and the symmetrical electrode surfaces 8 on the upper and lower sides are connected and conductive through conductive leads 9 installed on the side of the quartz wafer 3.

[0017] Due to size and low-frequency requirements, quartz crystal resonators inherently require larger and thicker quartz crystal wafers 3, resulting in relatively poor mechanical strength. This invention addresses this by modifying the internal electrode structure and dispensing structure of the ceramic base 1. The internal electrode of the ceramic base 1 is designed as an L-shaped electrode 4. The bottom surface of the notch 10 of the L-shaped electrode 4 is connected to the quartz crystal wafer 3 using conductive silver paste, enabling a circuit connection between the quartz crystal wafer 3 and the internal electrode 4. The upper surface of the L-shaped electrode 4 is connected to the quartz crystal wafer 3 using epoxy resin adhesive. Due to its high adhesion, this provides significant mechanical strength, increasing the product's drop resistance from 50 cycles to over 300 cycles. This effectively solves the problem of quartz crystal wafer 3 detaching due to insufficient mechanical strength. Furthermore, the use of epoxy resin for the second adhesive application point 6 avoids the risk of short circuits caused by the connection between the second adhesive application point 6 and the metal top cover 2.

[0018] The height of the L-shaped electrode 4 is 105~115μm, the distance between the bottom surface of the notch 10 and the lower end surface of the L-shaped electrode 4 is 15~25μm, and the thickness of the quartz wafer 3 is 85~91μm.

[0019] The frequency of the quartz crystal resonator is 24MHz.

[0020] The conductive lead 9 and electrode surface 8 are both two-layer structures of chromium and silver, with the inner layer being chromium and the outer layer being silver. The chromium is connected to the quartz crystal 3.

[0021] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0022] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0024] The above provides a detailed description of a miniaturized low-frequency quartz crystal resonator with strong mechanical properties provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A miniaturized low-frequency quartz crystal resonator with strong mechanical properties, the quartz crystal resonator comprising a ceramic substrate (1), a metal top cover (2), and a quartz crystal wafer (3), characterized in that: The ceramic base (1) has an inner cavity. The upper opening of the inner cavity is sealed by a metal cover (2) to form a closed chamber. Two L-shaped electrodes (4) are arranged side by side at the bottom of the inner cavity. Each L-shaped electrode (4) has a notch (10). A quartz wafer (3) is provided at the notch (10) of the two L-shaped electrodes (4). A first coating adhesive dot (5) is provided at the lower end of the quartz wafer (3) and the bottom surface of the notch (10). The first coating adhesive dot (5) is made of conductive silver paste. A second coating adhesive dot (6) is provided between the upper end of the L-shaped electrode (4) and the quartz wafer (3). The second coating adhesive dot (6) is made of epoxy resin. An external electrode (7) connected to the L-shaped electrode (4) is provided at the lower end of the ceramic base (1).

2. The small-sized low-frequency quartz crystal resonator with strong mechanical properties according to claim 1, characterized in that: The quartz wafer (3) has a symmetrical electrode surface (8) at the middle of both the upper and lower ends. The symmetrical electrode surfaces (8) on the upper and lower sides are connected and connected by conductive leads (9) installed on the side of the quartz wafer (3).

3. The small-sized low-frequency quartz crystal resonator with strong mechanical properties according to claim 1, characterized in that: The height of the L-shaped electrode (4) is 105~115μm, and the distance between the bottom surface of the notch (10) and the lower end surface of the L-shaped electrode (4) is 15~25μm.

4. The small-sized low-frequency quartz crystal resonator with strong mechanical properties according to claim 1, characterized in that: The frequency of the quartz crystal resonator is 24MHz.

5. The small-sized low-frequency quartz crystal resonator with strong mechanical properties according to claim 1, characterized in that: The thickness of the quartz wafer (3) is 85~91μm.

6. The small-sized low-frequency quartz crystal resonator with strong mechanical properties according to claim 2, characterized in that: The conductive lead (9) and electrode surface (8) are both two-layer structures of chromium and silver, with the inner layer being chromium and the outer layer being silver. The chromium is connected to the quartz wafer (3).

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