A quartz crystal oscillator seat ring for vacuum nitrogen-filled packaging

Abstract

This utility model provides a quartz crystal oscillator seat ring for vacuum nitrogen-filled packaging, relating to the field of quartz crystal oscillator packaging technology. It includes a seat ring body, a top cover on the top of the seat ring body, a base at the bottom of the seat ring body, heat dissipation fins on the outer side of the seat ring body, a one-way valve at the top of the heat dissipation fins, a microchannel inside the one-way valve, a composite sealing ring groove at the top of the microchannel, a spring post at the bottom of the cavity of the seat ring body, an annular groove at the bottom of the top cover, and a metal concave ring at the top of the seat ring body. By employing the microchannel and one-way valve, the seat ring body achieves efficient vacuuming and nitrogen filling before and after packaging, and automatically closes after nitrogen filling to prevent gas backflow or the entry of external impurities, significantly improving the airtightness and reliability of the packaging.

Description

Technical Field

[0001] This utility model relates to the field of quartz crystal oscillator packaging technology, and in particular to a quartz crystal oscillator mounting ring for vacuum nitrogen-filled packaging. Background Technology

[0002] According to a quartz crystal oscillator packaging structure disclosed in Chinese Patent Publication No. CN101420113A, the package includes a bottom layer; a circuit layout layer located on the bottom layer, which is divided into a first region and a second region, the first region having at least one cavity, and the second region forming a pair of buffer layers; a quartz crystal fixed at both ends on the buffer layers; a system chip placed in the cavity; a support layer disposed along the periphery of the buffer layer and the circuit layout layer; and a cover located on the support layer.

[0003] The aforementioned comparative documents and existing technologies have the following technical problems: Most existing quartz crystal oscillators use hermetically sealed metal or ceramic packaging. To ensure the long-term stability of the device, a vacuum is usually drawn or dry nitrogen is filled into the packaging cavity. However, the existing seat ring structure is mostly a single plane contact. During the vacuum extraction and nitrogen filling process, there are often problems of poor sealing or stress concentration, which leads to minor air leakage, oscillation frequency drift and reduced lifespan. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a quartz crystal oscillator mount for vacuum nitrogen-filled packaging.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a quartz crystal oscillator seat ring for vacuum nitrogen-filled packaging, comprising a seat ring body, a top cover on the top of the seat ring body, a base on the bottom of the seat ring body, heat dissipation fins on the outer side of the seat ring body, and a one-way valve on the top of the heat dissipation fins.

[0006] Preferably, the one-way valve has a microchannel inside, which penetrates the interior of the seat ring body.

[0007] Preferably, the seat ring body has an internal cavity, and the seat ring body is made of a metal alloy material.

[0008] Preferably, the top of the microchannel is provided with a composite sealing ring groove, which is located on the inner wall of the seat ring body cavity.

[0009] Preferably, the bottom of the cavity of the seat ring body is provided with spring posts, the spring posts are distributed at equal angles in the cavity of the seat ring body, and the top of the spring posts are connected to the top cover.

[0010] Preferably, the bottom end of the top cover is provided with an annular groove, and the annular groove is arranged in a ring array around the top cover.

[0011] Preferably, the top end of the seat ring body is provided with a metal concave ring, the size and position of which are consistent with the size and position of the annular groove at the bottom end of the top cover, and the metal concave ring and the annular groove cooperate with each other.

[0012] Beneficial effects

[0013] This invention employs microchannels and one-way valves. By evenly distributing multiple microchannels on the outer side of the housing and integrating an integrated one-way valve structure at its external end, the gas flow direction can be precisely controlled during vacuuming and nitrogen filling operations in the packaging process. Each microchannel radially penetrates from the outer wall of the housing to the inner wall of the cavity, forming a short and efficient gas path. When vacuuming is performed, the valve automatically opens under the action of pressure difference, and the gas is quickly discharged. When nitrogen is filled, nitrogen enters the cavity from the outside, and then the valve automatically closes under the pressure difference between the inside and outside. This structure can prevent nitrogen backflow and air backflow, ensuring the gas purity and stability of the internal cavity environment during long-term operation, and effectively avoiding crystal performance drift and quality degradation problems.

[0014] This invention employs a composite sealing ring groove and a metal concave ring. The microchannel opening has a composite sealing ring groove on the inner wall of the seat ring, into which an elastic sealing ring is embedded. During the pressing process between the seat ring and the top cover, this sealing ring engages with the annular groove below the top cover to achieve a good vertical static seal. Furthermore, the structure uses the metal concave ring and the annular groove to form a metal-to-metal interface, creating a primary airtight layer during hot pressing or welding. The two elements fit together during pressing, enabling automatic axial and radial positioning, improving assembly efficiency and consistency. This composite sealing structure, combining elasticity and metal, significantly reduces the risk of micro-leakage, enhances resistance to thermal stress, mechanical impact, and air pressure fluctuations, and effectively extends the device's lifespan and reliability.

[0015] In this invention, spring pillars are used. Multiple spring pillars are set on the bottom surface of the cavity inside the seat ring at equal angles. The top of the spring pillars abuts against the support surface under the top cover. During assembly or welding, they play a role in stress buffering and dispersion, preventing local load concentration caused by the pressure of the top cover. In particular, they protect sensitive structures such as crystal chips and electrode solder joints below. The spring pillar structure can also absorb some thermal strain during thermal cycling, avoiding thermal fatigue cracks and improving the overall mechanical performance of the packaging structure. Attached Figure Description

[0016] Figure 1 This is an isometric view of the present invention;

[0017] Figure 2 This is a front view of the present invention;

[0018] Figure 3 This is a side sectional view of the present invention;

[0019] Figure 4 This is a front sectional view of the present invention;

[0020] Figure 5 This is a front internal view of the present invention;

[0021] Figure 6 This is a schematic diagram of the interior of the back of this utility model;

[0022] Figure 7 This is a schematic diagram of the structure of the top cover of this utility model.

[0023] Legend:

[0024] 1. Seat ring body; 2. Top cover; 201. Annular groove; 3. Base; 4. Heat dissipation fins; 5. One-way valve; 6. Microchannel; 7. Composite sealing ring groove; 8. Spring post; 9. Metal concave ring. Detailed Implementation

[0025] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0026] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Specific Implementation Example 1:

[0028] Reference Figure 1-7This utility model provides a quartz crystal oscillator holder for vacuum nitrogen-filled packaging, including a holder body 1, a top cover 2 on the top of the holder body 1, a base 3 at the bottom of the holder body 1, heat dissipation fins 4 on the outer side of the holder body 1, a one-way valve 5 on the top of the heat dissipation fins 4, a microchannel 6 inside the one-way valve 5 penetrating the interior of the holder body 1, and a cavity inside the holder body 1. The holder body 1 is made of metal alloy material. A composite sealing ring groove 7 is located on the top of the microchannel 6 on the inner wall of the cavity of the holder body 1. Spring posts 8 are located at the bottom of the cavity of the holder body 1, and the spring posts 8 are evenly distributed in the cavity of the holder body 1. The top of the spring posts 8 is aligned with the bottom of the cavity of the holder body 1. The top cover 2 is connected to the bottom surface of the inner cavity of the seat ring, where multiple equiangularly distributed spring pillars 8 are arranged. The tops of the spring pillars 8 abut against the support surface below the top cover 2, playing a role in stress buffering and dispersion during assembly or welding, preventing local load concentration caused by the downward pressure of the top cover 2. In particular, it protects sensitive structures such as the crystal chip and electrode solder joints below. The spring pillar 8 structure can also absorb some thermal strain during thermal cycling, avoiding thermal fatigue cracks and improving the overall mechanical performance of the packaging structure. The bottom end of the top cover 2 is provided with an annular groove 201, which is arranged in a ring array around the top cover 2. The top end of the seat ring body 1 is provided with a metal concave ring 9, the size and position of which are consistent with the size and position of the annular groove 201 at the bottom end of the top cover 2. The metal concave ring 9 mates with the annular groove 201. A composite sealing ring groove 7 is provided at the opening of the microchannel 6 on the inner wall of the seat ring. An elastic sealing ring is embedded in this groove. During the pressing process between the seat ring and the top cover 2, this sealing ring mates with the annular groove 201 below the top cover 2 to achieve a good vertical static seal. Furthermore, this structure, through the metal concave ring 9 and the annular groove 201, forms a metal-to-metal interface, creating a primary airtight layer during hot pressing or welding. The two elements fit together during pressing, enabling automatic axial and radial positioning, improving assembly efficiency and consistency. This composite sealing structure, combining elasticity and metal, significantly reduces the risk of micro-leakage and enhances resistance to thermal stress, mechanical impact, and air pressure fluctuations. To effectively extend the lifespan and reliability of the device, microchannels 6 and one-way valves 5 are employed. By evenly distributing multiple microchannels 6 on the outer side of the housing and integrating an integrated one-way valve 5 structure at its external end, the gas flow direction can be precisely controlled during vacuuming and nitrogen filling operations in the packaging process. Each microchannel 6 extends radially from the outer wall of the housing to the inner wall of the cavity, forming a short and efficient gas path. When vacuuming is performed, the valve automatically opens under the action of pressure difference, and the gas is quickly discharged. When nitrogen is filled, nitrogen enters the cavity from the outside, and then the valve automatically closes under the pressure difference between the inside and outside. This structure can prevent nitrogen backflow and air backflow, ensuring the gas purity and stability of the internal cavity environment during long-term operation, and effectively avoiding crystal performance drift and quality degradation problems. Specific Implementation Example 2:

[0030] Reference Figure 1 Multi-layer ceramic green ceramic strips are stacked together, with wires pre-embedded inside, and then sintered into a single integrated three-dimensional circuit structure. The mounting ring is no longer a two-dimensional planar concept of base and cover plate, but a three-dimensional ceramic block with its own cavity. Conductive paths, grounding layers, capacitors, inductors and other passive components can be directly printed and embedded between different layers of the ceramic mounting ring. Some peripheral circuits are integrated into the mounting ring, simplifying PCB design and reducing the size of the overall solution. The embedded short-path wiring and grounding layer improve electromagnetic shielding and reduce parasitic parameters, which is particularly effective in improving the performance of high-frequency oscillators. The integrated sintered structure is robust and has excellent resistance to thermal and mechanical shock.

[0031] In summary:

[0032] 1. By using microchannel 6 and one-way valve 5, the structure of one-way valve 5 and internal through-hole microchannel 6 on seat ring body 1 can achieve efficient vacuuming and nitrogen filling before and after packaging, and automatically close after nitrogen filling to prevent gas backflow or external impurities from entering, significantly improving the airtightness and reliability of packaging.

[0033] 2. By adopting a composite sealing ring groove 7 and a metal concave ring 9, the microchannel 6 opening is equipped with a composite sealing ring groove 7, which is embedded with an elastic sealing ring. During the press-fitting of the cover, it can form a double sealing interface with the annular groove 201 of the top cover 2, effectively preventing micro-leakage caused by a single contact surface and significantly improving long-term sealing stability. Furthermore, by setting a metal concave ring 9 at the top of the seat ring, which cooperates with the corresponding annular groove 201 at the bottom of the top cover 2, a metal-to-metal contact surface is formed, which not only achieves high-precision self-positioning assembly, but also forms a primary sealing interface, providing a reliable foundation for subsequent press-fitting or laser welding.

[0034] 3. The use of spring pillars 8 realizes a structure with multiple spring pillars 8 distributed at the bottom of the seat ring cavity. The top of the spring pillars 8 makes contact with the inner wall of the top cover 2, which can play a buffering role during the encapsulation and pressing process, disperse the local stress applied to the crystal substrate by the top cover 2, avoid damage to the device solder joints or crystal chips, and improve the reliability of the structure.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A quartz crystal oscillator rim for vacuum nitrogen-filled packaging, comprising a rim body (1), characterized in that: The seat body (1) has a top cover (2) on the top, a base (3) on the bottom, heat dissipation fins (4) on the outer side, and a one-way valve (5) on the top of the heat dissipation fins (4).

2. The quartz crystal oscillator holder for vacuum nitrogen filled packaging according to claim 1, wherein: The one-way valve (5) has a microchannel (6) inside, which penetrates the interior of the seat body (1).

3. The quartz crystal oscillator jewel for vacuum nitrogen filled package according to claim 2, wherein: The seat body (1) has an internal cavity and is made of metal alloy material.

4. The quartz crystal oscillator holder for vacuum nitrogen filled packaging according to claim 2, wherein: The top of the microchannel (6) is provided with a composite sealing ring groove (7), which is located on the inner wall of the cavity of the seat ring body (1).

5. The quartz crystal oscillator jewel for vacuum nitrogen filled packaging as claimed in claim 4, wherein: The bottom of the cavity of the seat body (1) is provided with spring posts (8), which are distributed at equal angles in the cavity of the seat body (1). The top of the spring posts (8) is connected to the top cover (2).

6. The quartz crystal oscillator jewel for vacuum nitrogen filled packaging as claimed in claim 5 wherein: The bottom end of the top cover (2) is provided with an annular groove (201), and the annular groove (201) is arranged in a ring array around the top cover (2).

7. The quartz crystal oscillator jewel for vacuum nitrogen filled package as claimed in claim 5 wherein: The top of the seat body (1) is provided with a metal concave ring (9). The size and position of the metal concave ring (9) are consistent with the size and position of the bottom annular groove (201) of the top cover (2), and the metal concave ring (9) and the annular groove (201) are matched.

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