A metal casing for an electromagnetic interference quartz crystal oscillator

Abstract

This utility model provides a metal housing for an electromagnetic interference-resistant quartz crystal oscillator, relating to the field of housing technology. It includes a base, an extended housing on top of the base, and a metal housing body inside the extended housing. Both sides of the extended housing have pry grooves, and the inner surface of the extended housing has metal clips. When the metal clip on the extended housing encounters a locking block and is pressed down further, the locking block squeezes the metal clip, causing it to deform until it passes the locking block. The clip then returns to its original shape through its own plasticity and locks the locking block in place. This allows the extended housing to be installed on the base via the internal metal clips and to cover the metal housing body. By adding extended housings of different materials, different magnetic fields can be shielded, allowing the quartz crystal oscillator to adapt to different scenarios. This solves the problem that when near high-power communication equipment, industrial frequency converters, or other locations with strong electromagnetic fields, the original housing alone cannot effectively shield the electromagnetic fields and meet the usage requirements.

Description

Technical Field

[0001] This utility model relates to the field of housing technology, and in particular to a metal housing for a quartz crystal oscillator that is resistant to electromagnetic interference. Background Technology

[0002] According to a quartz crystal oscillator disclosed in Chinese Publication No. CN1261994A, it includes an outer shell (1), an inner shell (6) for a circuit board (2), and a resonator located inside its own shell (9) at the bottom of the inner shell. The inner shell (6) is made of a highly thermally conductive material and is an open box shape. The bottom of the box is close to one side of the central part of the circuit board (2). All the temperature control elements of the oscillator are mounted on the central part (3) of the circuit board (2). The central part is separated from the peripheral part by a slot (4) that penetrates the thickness of the plate and a narrow gap between the central part and the end of the slot (4). The heating element (10) and the main temperature sensor (11) are mounted on the side wall of the inner housing (6) with narrow margins (5). The inner housing (6) is also equipped with a high thermal conductivity rod (8) that passes through the center of the circuit board (2) near each margin (5). The open side of the housing (6) is covered with a thin copper cover (12) that leaves a thermal insulation gap relative to the housing (9) of the quartz crystal oscillator. A copper cover (13) is fixed to the end of the thermally conductive rod (8) that extends above the back of the circuit board (2), also leaving a thermal insulation gap relative to the thermostatic control element mounted on this side of the circuit board. The temperature regulator is made according to a bridge circuit and is equipped with an additional thermal arm with an additional temperature sensor mounted on the periphery of the circuit board (2).

[0003] The aforementioned technologies and existing quartz crystal oscillators are susceptible to external electromagnetic interference, leading to frequency shifts and other problems that affect their normal operation. Although the original casing may have some shielding capability, in some complex electromagnetic environments, such as when near high-power communication equipment or industrial frequency converters where electromagnetic fields are strong, the original casing alone cannot effectively shield the electromagnetic fields to meet the usage requirements. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies where the original casing alone cannot effectively shield electromagnetic fields when the device is near high-power communication equipment, industrial frequency converters, or other devices with strong electromagnetic fields, thus failing to meet usage requirements. This invention proposes a metal casing for an electromagnetically resistant quartz crystal oscillator.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a metal housing for an electromagnetic interference quartz crystal oscillator, comprising a base, an extended housing on the top of the base, a metal housing body inside the extended housing, pry grooves on both sides of the extended housing, a metal buckle on the inner surface of the extended housing, a locking block on the outer surface of the metal housing body, and a silicone pad between the extended housing and the metal housing body, the surface of the silicone pad being arrayed with protrusions.

[0006] Preferably, the metal outer shell body is mounted on the top surface of the base, and the metal outer shell body is welded to the base.

[0007] Preferably, the card block is located at the bottom of the outer surface of the metal shell body, and the card block is integrally formed with the metal shell body, and the cross-section of the card block is semi-circular.

[0008] Preferably, the silicone pad covers the outer surface of the metal shell body, and the silicone pad is sleeved with the metal shell body, and the protrusions on the surface of the silicone pad are integrally formed with the silicone pad.

[0009] Preferably, the two pry slots are mirror images of the expansion housing, and both pry slots are located at the middle of the bottom edge of the expansion housing.

[0010] Preferably, the cross-section of the metal buckle is semi-circular, and the metal buckle is perpendicularly intersecting the card block.

[0011] Preferably, the metal buckle is welded to the extended outer shell, the extended outer shell is installed on the top surface of the base, and the extended outer shell is engaged with the metal outer shell body by the metal buckle.

[0012] Beneficial effects

[0013] In this invention, an extended outer shell is added to the outside of the main metal casing. The extended outer shell can be made of materials such as copper or aluminum to shield high-frequency electromagnetic fields, or it can be made of iron alloy or permalloy to shield low-frequency magnetic fields. During installation, the outer shell is directly pressed onto the base. When the metal buckle on the extended outer shell encounters the locking block and is pressed down further, the locking block will squeeze the metal buckle, causing the metal buckle to deform. After the metal buckle passes the locking block, it will return to its original shape through its own plasticity and lock the locking block. Thus, the extended outer shell is installed on the base through the internal metal buckle and covers the main metal casing. By adding extended outer shells of different materials to shield different magnetic fields, the quartz crystal oscillator can be adapted to different scenarios. This solves the problem that when the electromagnetic fields are strong near high-power communication equipment, industrial frequency converters, etc., the original outer shell alone cannot effectively shield the electromagnetic fields and meet the usage requirements. Attached Figure Description

[0014] Figure 1 This is an isometric drawing of the present invention;

[0015] Figure 2 This is a front view of the present invention;

[0016] Figure 3 For the present utility model Figure 2 Sectional view at point AA;

[0017] Figure 4 This is a partial isometric drawing of the present invention.

[0018] Legend:

[0019] 1. Base; 2. Extended outer shell; 3. Pry groove; 4. Metal buckle; 5. Metal outer shell body; 6. Locking block; 7. Silicone pad; 8. Raised point. Detailed Implementation

[0020] 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.

[0021] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Specific Implementation Example 1:

[0023] Reference Figure 1-4 An electromagnetic interference-resistant quartz crystal oscillator metal housing includes a base 1, an extended housing 2 on the top of the base 1, a metal housing body 5 inside the extended housing 2, pry grooves 3 on both sides of the extended housing 2, a metal buckle 4 on the inner surface of the extended housing 2, a locking block 6 on the outer surface of the metal housing body 5, a silicone pad 7 between the extended housing 2 and the metal housing body 5, and an array of protrusions 8 on the surface of the silicone pad 7. The metal housing body 5 is mounted on the top surface of the base 1 and is welded or strongly adhesively bonded to the base 1. The locking block 6 is located at the bottom end of the outer surface of the metal housing body 5. 6 is integrally formed with the metal shell body 5. The cross-section of the locking block 6 is semi-circular. The silicone pad 7 wraps around the outer surface of the metal shell body 5 and is sleeved with the metal shell body 5. The protrusions 8 on the surface of the silicone pad 7 are integrally formed with the silicone pad 7. The two pry grooves 3 are mirrored with the expansion shell 2 as the center, and both pry grooves 3 are located in the middle of the bottom edge of the expansion shell 2. The cross-section of the metal buckle 4 is semi-circular, and the metal buckle 4 is perpendicularly intersecting with the locking block 6. The metal buckle 4 is welded to the expansion shell 2. The expansion shell 2 is installed on the top surface of the base 1, and the expansion shell 2 is snapped into the locking block 6 of the metal shell body 5 through the metal buckle 4.

[0024] The base 1 supports the entire oscillator housing and serves as the mounting base for connecting to external circuits, contacting mounting platforms such as circuit boards. The metal outer shell 5 on top of the base 1 is securely welded to the base 1. The metal outer shell 5 is the first layer of metal protection for encapsulating the quartz crystal and oscillation circuit. It provides electromagnetic shielding, dustproofing, moisture protection, and mechanical protection; its welded fixation to the base 1 ensures electrical grounding and stability; simultaneously, the locking block 6 on the outer surface is integrally formed with the metal outer shell 5 and located at its bottom. Its cross-section is semi-circular, mates with the metal clip 4; during the pressing installation process, the metal clip 4 is compressed, forming an interference fit, and providing locking force for the metal clip 4 of the extended shell 2 after installation. The silicone pad 7 outside the metal outer shell 5 is an intermediate medium for vibration buffering and electrical isolation. It fits the outside of the metal outer shell 5, adhering to its surface; it wraps around the entire metal outer shell 5, mitigating external forces and mechanical impacts; it provides an intermediate elastic layer to absorb structural gap changes or thermal expansion and contraction; it also isolates the extended shell 2 from direct metal contact with the metal outer shell 5, reducing electromagnetic coupling. The raised dots 8 are integrally formed on the surface of the silicone pad 7, forming a regular array; this enhances the friction between the silicone pad 7 and the shell, improving structural stability. During installation, the raised dots 8 are compressed and deformed, enhancing the tightness of the fit. The extended shell 2 outside the main metal shell 5 is a second layer of metal shielding shell, used to strengthen the anti-electromagnetic interference capability. The extended shell 2 can be made of different materials depending on the application scenario; copper and aluminum are used for high-frequency electromagnetic shielding, while permalloy and other materials are used for low-frequency magnetic field shielding. The extended shell 2 is elastically locked to the main metal shell 5 by the inner metal buckle 4 and the locking block 6. When the scenario changes or the shielding requirements change, the extended shell 2 can be quickly disassembled, replaced, or removed. The metal buckle 4 is welded to the inner wall of the extended shell 2; during installation, as the extended shell 2 is pressed down, the locking block 6 gradually compresses the metal buckle 4, causing it to elastically deform; when the locking block 6 has completely passed through, the metal buckle 4 returns to its original shape and locks under the locking block 6, forming a reliable lock. The pry groove 3 is a structural groove for easy disassembly of the extended shell 2. Located at the center of the bottom edge of the expansion housing 2, the expansion housing 2 can be separated from the metal housing body 5 by inserting an external metal plate into the pry groove 3 and prying it upwards. This structure forms a mirror arrangement, which ensures even force distribution during disassembly and avoids damage to the housing structure. Specific Implementation Example 2:

[0026] Reference Figure 1-4An anti-electromagnetic interference quartz crystal oscillator metal casing is further based on the basic structure in Specific Embodiment 1. The quartz crystal oscillator is first mounted on the base 1, and then the metal casing body 5 is mounted on the base 1 and welded to the base 1. The metal casing body 5 covers the quartz crystal oscillator, thus providing basic physical protection and first-layer electromagnetic shielding, ensuring the normal operation and frequency stability of the oscillator in a standard environment. When the quartz crystal oscillator needs to operate in an environment with strong electromagnetic interference, the traditional metal casing body 5 cannot provide sufficient shielding capability. At this time, the user can select an extended casing 2 of appropriate material according to the type of interference source, high-frequency electromagnetic field or low-frequency magnetic field. The selected extended casing 2 is snapped into the locking block 6 at the bottom of the metal casing body 5 by a metal buckle 4. During installation, simply align the extended casing 2 with the base 1 and press it down. When the metal buckle 4 contacts the locking block 6, its semi-circular cross-section will cause it to deform under pressure. Once the metal clip 4 passes through the latch 6, it immediately returns to its original shape and firmly locks into the latch 6, thus securing the expansion housing 2 firmly onto the base 1 and completely covering the metal housing body 5. The silicone pad 7 and its surface protrusions 8 provide cushioning, vibration damping, and additional frictional fixation, ensuring the expansion housing 2 is tightly installed and not easily loosened. If the usage scenario changes, the electromagnetic shielding requirements also change. The user can easily detach the current expansion housing 2 from the base 1 by simultaneously inserting two metal plates into the pry slot 3, applying force to deform the metal clip 4 and disengage it from the latch 6. After separation, the expansion housing 2 can be discarded or replaced with an expansion housing 2 of a different material to adapt to the new electromagnetic environment, enabling rapid configuration and flexible adaptation of the oscillator under different electromagnetic interference scenarios.

[0027] In summary:

[0028] 1. An extension shell 2 is added to the outside of the main metal shell 5. The extension shell 2 can be made of copper, aluminum, or other materials to shield high-frequency electromagnetic fields, or iron alloy or permalloy to shield low-frequency magnetic fields. During installation, the extension shell 2 is directly pressed onto the base 1. When the metal buckle 4 on the extension shell 2 encounters the locking block 6 and continues to press down, the locking block 6 will squeeze the metal buckle 4, causing the metal buckle 4 to deform. After the metal buckle 4 passes the locking block 6, it will return to its original shape through its own plasticity and lock the locking block 6. Thus, the extension shell 2 is installed on the base 1 through the internal metal buckle 4 and covers the main metal shell 5. By adding extension shells 2 of different materials to shield different magnetic fields, the quartz crystal oscillator can adapt to different scenarios. This solves the problem that when the electromagnetic fields are strong near high-power communication equipment, industrial frequency converters, etc., the original shell alone cannot effectively shield the electromagnetic fields to meet the usage requirements.

[0029] 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.

[0030] 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 metal case of a quartz crystal oscillator against electromagnetic interference, comprising a base (1), characterized in that: The base (1) has an expansion shell (2) on top, and a metal shell body (5) is provided inside the expansion shell (2). Both sides of the expansion shell (2) are provided with pry grooves (3). The inner surface of the expansion shell (2) is provided with metal buckles (4). The outer surface of the metal shell body (5) is provided with clips (6). A silicone pad (7) is provided between the expansion shell (2) and the metal shell body (5). The surface of the silicone pad (7) is provided with protrusions (8).

2. The electromagnetic interference resistant quartz crystal oscillator metal housing of claim 1, wherein: The metal shell body (5) is installed on the top surface of the base (1), and the metal shell body (5) is welded to the base (1).

3. The electromagnetic interference resistant quartz crystal oscillator metal housing of claim 1, wherein: The card block (6) is located at the bottom of the outer surface of the metal shell body (5), and the card block (6) is integrally formed with the metal shell body (5). The cross-section of the card block (6) is semi-circular.

4. The electromagnetic interference resistant quartz crystal oscillator metal housing of claim 1, wherein: The silicone pad (7) covers the outer surface of the metal shell body (5) and is fitted with the metal shell body (5). The protrusions (8) on the surface of the silicone pad (7) are integrally formed with the silicone pad (7).

5. The electromagnetic interference resistant quartz crystal oscillator metal housing of claim 1, wherein: The two pry slots (3) are mirror images of the extended housing (2), and both pry slots (3) are located at the middle of the bottom edge of the extended housing (2).

6. The electromagnetic interference resistant quartz crystal oscillator metal housing of claim 1, wherein: The cross-section of the metal buckle (4) is semi-circular, and the metal buckle (4) and the card block (6) are set perpendicularly to each other.

7. The electromagnetic interference resistant quartz crystal oscillator metal housing of claim 1, wherein: The metal buckle (4) is welded to the extended shell (2), the extended shell (2) is installed on the top surface of the base (1), and the extended shell (2) is snapped into the metal shell body (5) by the metal buckle (4) and the snap block (6).

Images