An improved sealed housing for a quartz crystal oscillator

Abstract

This utility model relates to an improved sealing housing for quartz crystal oscillators, and pertains to the field of quartz crystal oscillator packaging technology. It includes a double-layer composite housing with a sealing cover on top, a heat dissipation groove on the outer side, interface pins on the bottom, and a sealing ring on the top. The use of the double-layer composite housing and sealing ring comprehensively improves sealing performance and enhances the environmental stability of the oscillator. Compared to traditional single-layer housings, the double-layer composite packaging structure, consisting of a protective outer shell and an insulating inner shell, significantly enhances overall airtightness. Combined with the low-temperature eutectic tin alloy sealing ring welding method, a stable and durable metal seal is formed in the housing interface area, effectively isolating external moisture, oxygen, and particles from entering, preventing internal environmental degradation, and significantly improving the frequency stability and long-term reliability of the quartz crystal oscillator.

Description

Technical Field

[0001] This utility model relates to the field of quartz crystal oscillator packaging technology, and in particular to an improved quartz crystal oscillator sealing shell. Background Technology

[0002] According to a stable high-frequency quartz crystal oscillator disclosed in Chinese Patent Publication No. CN216216805U, which relates to the field of quartz crystal oscillator technology, the oscillator includes a metal housing, a crystal base movably disposed at the bottom of the metal housing, an insulator movably disposed on the inner wall of the crystal base, pins fixedly disposed on the inner wall of the insulator, a quartz plate fixedly disposed on the top of the pins, a silver-plated layer fixedly disposed on the outer wall of the quartz plate, an auxiliary frame movably disposed on the outer wall of the silver-plated layer, and a cover fixedly disposed on the top of the auxiliary frame.

[0003] The aforementioned comparative documents and existing technologies have the following technical problems: Existing quartz crystal oscillator packaging shells typically adopt a single-layer sealed structure made of metal or ceramic materials. The structure is simple but has the following problems: insufficient sealing performance leads to internal water vapor penetration, affecting oscillation stability; poor heat dissipation performance causes excessive temperature rise, affecting frequency accuracy; complex manufacturing process requires high dust-free conditions and has high cost. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an improved sealed housing for a quartz crystal oscillator.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an improved quartz crystal oscillator sealing shell, comprising a double-layer composite shell, a sealing cover on the top of the double-layer composite shell, a heat dissipation groove on the outer side of the double-layer composite shell, interface pins on the bottom of the double-layer composite shell, and a sealing ring on the top of the double-layer composite shell.

[0006] Preferably, the double-layer composite shell includes a protective outer shell and an insulating inner shell, wherein the inner top of the protective outer shell is provided with an inner wall annular groove, and the outer top of the insulating inner shell is provided with an outer wall annular groove.

[0007] Preferably, an annular groove is formed between the inner wall annular groove and the outer wall annular groove, and a sealing ring is provided in the annular groove.

[0008] Preferably, the outer side of the inner isolation shell is provided with a side conduction column, and the bottom of the inner isolation shell is provided with a bottom conduction column.

[0009] Preferably, the side conductive pillars and the bottom conductive pillars are made of copper, and the bottom conductive pillar is L-shaped. The ports of the side conductive pillars and the bottom conductive pillars are connected to the bottom of the heat sink.

[0010] Preferably, the double-layer composite shell has a quartz crystal oscillator body inside, the bottom of the quartz crystal oscillator body has a desiccant chamber, the bottom of the insulating inner shell has threads, the bottom of the desiccant chamber has a screw, and the desiccant chamber and the bottom of the insulating inner shell are connected by threads.

[0011] Preferably, the bottom of the desiccant chamber is provided with a vent hole, the bottom of the quartz crystal oscillator body is provided with an electrode lead, the electrode lead is electrically connected to the interface pin, and the interface pin is L-shaped.

[0012] Beneficial effects

[0013] This invention employs a double-layer composite shell and sealing ring, which comprehensively improves sealing performance and enhances the environmental stability of the oscillator. Compared to traditional single-layer shells, the double-layer composite encapsulation structure composed of a protective shell and an insulating inner shell significantly enhances overall airtightness. Combined with the low-temperature eutectic tin alloy sealing ring welding method, a stable and durable metal seal is formed in the shell interface area, which can effectively isolate external moisture, oxygen, and particles from entering, prevent internal environmental degradation, and significantly improve the frequency stability and long-term reliability of the quartz crystal oscillator.

[0014] This invention employs a desiccant chamber. The built-in desiccant chamber allows for the injection of highly active desiccant and vacuum sealing before packaging via pre-set micropores. During device use, it continuously adsorbs internal moisture, maintaining a dry and low-humidity environment. This structural design integrates the drying function into the packaging itself, avoiding dependence on the external environment, effectively reducing the crystal aging rate, and extending the device's service life. It is particularly suitable for application scenarios under harsh climatic conditions.

[0015] This invention employs heat dissipation slots and conductive pillars to solve the frequency drift problem caused by temperature rise. The heat dissipation slots, together with the copper bottom and side heat conduction pillars, form an active heat conduction structure. The heat dissipation slots are evenly distributed and vertically cover all four sides. The independent channels form a complete air heat exchange network. Heat is rapidly conducted from the heat conduction pillars under the crystal to the surface of the outer shell, and then continuously convects with the ambient air through the longitudinal channels. This structure achieves a low thermal resistance path design, which can effectively control the operating temperature rise of the device, reduce the impact of temperature drift on the frequency, and improve frequency accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is an isometric view of the present invention;

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

[0019] Figure 4 This is a side sectional view of the present invention.

[0020] Legend:

[0021] 1. Double-layer composite outer shell; 101. Protective outer shell; 102. Isolating inner shell; 103. Inner wall annular groove; 104. Outer wall annular groove; 2. Sealing cover; 3. Heat dissipation groove; 4. Interface pins; 5. Sealing ring; 6. Side conductive post; 7. Bottom conductive post; 8. Quartz crystal oscillator body; 801. Electrode leads; 9. Desiccant compartment. Detailed Implementation

[0022] 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.

[0023] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Specific Implementation Example 1:

[0025] Reference Figure 1-4This utility model provides an improved sealed housing for a quartz crystal oscillator, comprising a double-layer composite housing 1, a sealing cover 2 on the top of the double-layer composite housing 1, a heat dissipation groove 3 on the outer side of the double-layer composite housing 1, interface pins 4 on the bottom of the double-layer composite housing 1, and a sealing ring 5 on the top of the double-layer composite housing 1. The double-layer composite housing 1 includes a protective housing 101 and an insulating inner housing 102. The inner top of the protective housing 101 has an inner wall annular groove 103, and the outer top of the insulating inner housing 102 has an outer wall annular groove 104. An annular groove is formed between the inner wall annular groove 103 and the outer wall annular groove 104, and a sealing ring 5 is provided in the annular groove. The insulating inner housing 102... The outer side of the inner shell 102 is provided with a side conduction column 6, and the bottom of the inner shell 102 is provided with a bottom conduction column 7. The side conduction column 6 and the bottom conduction column 7 are made of copper, and the bottom conduction column 7 is L-shaped. The ports of the side conduction column 6 and the bottom conduction column 7 are connected to the bottom of the heat dissipation groove 3. The double-layer composite shell 1 is provided with a quartz crystal oscillator body 8 inside. The bottom of the quartz crystal oscillator body 8 is provided with a desiccant chamber 9. The bottom of the inner shell 102 is provided with threads, and the bottom of the desiccant chamber 9 is provided with a screw. The desiccant chamber 9 and the bottom of the inner shell 102 are connected by threads. The bottom of the desiccant chamber 9 is provided with a vent hole. The bottom of the quartz crystal oscillator body 8 is provided with electrode leads 801, which are electrically connected to interface pins 4. The interface pins 4 are L-shaped. Working principle: The quartz crystal resonator is sealed in an airtight cavity through a double-layer composite encapsulation structure. During operation, the resonator oscillates stably within the cavity. Interface pins 4 lead the electrical signal to the external circuit. If heat is generated during operation, copper heat conduction pillars rapidly transfer the heat from the bottom of the cavity to the outer shell surface. The longitudinally penetrating microgrooves in the heat dissipation grooves 3 form an efficient convection heat dissipation loop with the outside air, maintaining a stable internal temperature. Simultaneously, the desiccant in the desiccant chamber 9 continuously absorbs heat under airtight conditions. To prevent moisture buildup within the cavity, the overall structure effectively coordinates sealing, heat dissipation, miniaturization, and manufacturability requirements. It employs a double-layer composite outer shell 1 and a sealing ring 5, which comprehensively enhances sealing performance and improves the environmental stability of the oscillator. The double-layer composite encapsulation structure composed of the protective outer shell 101 and the isolation inner shell 102 significantly enhances the overall airtightness compared to the traditional single-layer shell. Combined with the low-temperature eutectic tin alloy sealing ring 5 welding method, a stable and durable metal seal is formed in the shell interface area, which can effectively isolate external moisture, oxygen, and particles from entering, prevent internal environmental degradation, and significantly improve the frequency stability and long-term reliability of the quartz crystal oscillator. Specific Implementation Example 2:

[0027] Reference Figure 1By combining multilayer ceramic and micro-motor system technologies, a quartz wafer is suspended in the cavity through a micro cantilever beam structure, which fundamentally improves the vibration and shock resistance. The drive integrated circuit is placed under the wafer in a three-dimensional stacking manner, and finally atomic-level bonding and sealing is performed by laser. This structure achieves extreme miniaturization while also obtaining unprecedented frequency stability.

[0028] In summary:

[0029] By adopting a double-layer composite outer shell 1 and a sealing ring 5, the sealing performance can be comprehensively improved, enhancing the environmental stability of the oscillator. The double-layer composite encapsulation structure composed of the protective outer shell 101 and the isolation inner shell 102 significantly enhances the overall airtightness compared to the traditional single-layer shell. Combined with the low-temperature eutectic tin alloy sealing ring 5 welding method, a stable and durable metal seal is formed in the shell interface area, which can effectively isolate external moisture, oxygen and particles from entering, prevent internal environmental degradation, and significantly improve the frequency stability and long-term reliability of the quartz crystal oscillator.

[0030] The desiccant chamber 9 is adopted, realizing the built-in desiccant chamber 9. Highly active desiccant can be injected and vacuum sealed before packaging through preset micropores. During the use of the device, it continuously adsorbs internal moisture and maintains a dry and low humidity environment. This structural design integrates the drying function into the packaging body itself, avoids dependence on the external environment, effectively reduces the crystal aging rate, and extends the service life of the device. It is especially suitable for application scenarios under harsh climatic conditions.

[0031] 3. By employing heat sink 3 and conductive pillars, the frequency drift problem caused by temperature rise is solved. The heat sink 3, together with the copper bottom heat conduction pillars and side heat conduction pillars, forms an active heat conduction structure. The heat sink 3 is evenly distributed and vertically covers the four sides. The independent channels form a complete air heat exchange network. Heat is rapidly conducted from the heat conduction pillars under the crystal to the surface of the shell, and then continuously convects with the ambient air through the longitudinal channels. This structure achieves a low thermal resistance path design, which can effectively control the operating temperature rise of the device, reduce the impact of temperature drift on the frequency, and improve frequency accuracy.

[0032] 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.

[0033] 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. An improved sealed housing for a quartz crystal oscillator, comprising a double-layer composite housing (1), characterized in that: The top of the double-layer composite shell (1) is provided with a sealing cover (2), the outer side of the double-layer composite shell (1) is provided with a heat dissipation groove (3), the bottom of the double-layer composite shell (1) is provided with an interface pin (4), the top of the double-layer composite shell (1) is provided with a sealing ring (5), the double-layer composite shell (1) includes a protective shell (101) and an isolation inner shell (102), the top of the inner side of the protective shell (101) is provided with an inner wall annular groove (103), the top of the outer side of the isolation inner shell (102) is provided with an outer wall annular groove (104), an annular groove is formed between the inner wall annular groove (103) and the outer wall annular groove (104), and the sealing ring (5) is provided in the annular groove.

2. The improved quartz crystal oscillator sealing housing according to claim 1, characterized in that: The interior of the double-layer composite shell (1) is provided with a quartz crystal oscillator body (8), and the bottom of the quartz crystal oscillator body (8) is provided with a desiccant chamber (9).

3. The improved quartz crystal oscillator sealing housing according to claim 2, characterized in that: The bottom of the quartz crystal oscillator body (8) is provided with an electrode lead (801), which is electrically connected to the interface pin (4), and the interface pin (4) is L-shaped.

4. The improved quartz crystal oscillator sealing housing according to claim 2, characterized in that: The outer side of the isolation inner shell (102) is provided with a side conduction column (6), and the bottom of the isolation inner shell (102) is provided with a bottom conduction column (7).

5. The improved quartz crystal oscillator sealing housing according to claim 4, characterized in that: The side conduction column (6) and the bottom conduction column (7) are made of copper, and the bottom conduction column (7) is L-shaped. The ports of the side conduction column (6) and the bottom conduction column (7) are connected to the bottom of the heat sink (3).

6. The improved quartz crystal oscillator sealing housing according to claim 2, characterized in that: The bottom of the inner shell (102) is provided with threads, and the bottom of the desiccant chamber (9) is provided with screws. The desiccant chamber (9) and the bottom of the inner shell (102) are connected by threads.

7. The improved quartz crystal oscillator sealing housing according to claim 6, characterized in that: The bottom of the desiccant chamber (9) is provided with a vent.

Images