CN210578461U - Crystal oscillator with ESD protection and RF radiation shielding functions - Google Patents

Abstract

The utility model discloses a crystal oscillator with ESD protection and RF radiation shielding functions, relating to the field of crystal oscillators, the key point of the technical proposal is that the crystal oscillator comprises a crystal oscillator body, a supporting bottom plate and a protective cap body which is butted against the top surface of the supporting bottom plate, the protective cap body and the supporting bottom plate are mutually matched to form an accommodating cavity for accommodating the crystal oscillator body, the protecting cap body and the supporting bottom plate are both internally provided with metal mesh interlayers, the protecting cap body is electrically connected with the metal mesh interlayers in the supporting bottom plate, the bottom of the supporting bottom plate is provided with a through hole for the pin of the crystal oscillator body to pass through, the crystal oscillator has the technical effects that the crystal oscillator can effectively shield external RF radiation outside the accommodating cavity, can protect a crystal oscillator body in the accommodating cavity, and can avoid the adverse effect of high-strength RF radiation or a fiercely changed electric field and magnetic field on the work of the crystal oscillator.

Description

Crystal oscillator with ESD protection and RF radiation shielding functions

Technical Field

The utility model relates to a crystal oscillator field, in particular to crystal oscillator with ESD protection and shielding RF radiation function.

Background

Quartz crystal oscillators, also known as crystal oscillators, are made of quartz crystal wafers with a piezoelectric effect, which quartz crystal wafers, when subjected to an externally applied alternating electric field, produce mechanical vibrations, which become very strong when the frequency of the alternating electric field is the same as the natural frequency of the quartz crystal, which is a reaction to the resonance characteristics of the crystal, with which characteristics the crystal oscillator can be used instead of LC resonant circuits and filters, etc.

The crystal oscillator has the advantages of small size, light weight, high reliability, high frequency stability and the like, and is applied to household appliances and communication equipment. However, with the miniaturization of electronic components, the high integration and the micro-assembly of integrated circuits, the RF noise between components and assemblies is increasing, and the RF interference control design of crystal oscillators is facing a serious challenge. Research has shown that the effect of device RF radiation interference on the crystal oscillator is particularly important, which can lead to degradation of stability and reliability of the crystal oscillator, and thus, degradation of the performance of the entire electronic device.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a crystal oscillator with ESD protection and shielding RF radiation function, it can effectively shield external RF radiation outside the holding cavity, avoids the RF radiation of high strength or the electric field magnetic field of violent change to cause harmful effects to crystal oscillator's work.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a crystal oscillator with ESD protection and shielding RF radiation function, includes crystal oscillator body, supporting baseplate and butt in the protective cap body of supporting baseplate top surface, the protective cap body and supporting baseplate mutually support and form the holding cavity that is used for holding the crystal oscillator body, the protective cap body all is provided with the metal mesh intermediate layer with the inside of supporting baseplate, the protective cap body and the inside metal mesh intermediate layer electric connection of supporting baseplate, the supporting baseplate bottom is provided with the through-hole that supplies crystal oscillator body pin to pass.

Through adopting above-mentioned technical scheme, the mutual electric connection of metal mesh between the protective cap body and the supporting baseplate, because the metal that does not produce the electric current has the characteristics that electric potential everywhere equals, and RF radiation's essence is the electromagnetic wave, electric field and magnetic field vibrate repeatedly on its propagation direction of perpendicular to, consequently, the metal mesh between the protective cap body and the supporting baseplate forms a unified whole, the electric field can not take place the vibration again when RF radiation meets this whole, thereby blocked outside this whole, consequently the inside metal mesh intermediate layer of protective cap body and supporting baseplate mutually supports and can play the effect of shielding RF radiation, thereby guarantee crystal oscillator's stability and reliability.

Further setting: the top surface of the supporting bottom plate is provided with a connecting ring groove for embedding the protective cap body, and the connecting ring groove is internally provided with conductive colloid which is electrically connected with the protective cap body and the supporting bottom plate.

Through adopting above-mentioned technical scheme, in the protective cap body embedding connection annular, the rethread conductive adhesive bonds on supporting baseplate, compares in directly using glue to bond the protective cap body at supporting baseplate's top surface, and it not only receives the effort of the tank bottom of connection annular on keeping away from supporting baseplate's direction, still receives the effort of lateral wall, connects more firmly. In addition, the conductive colloid enables the metal mesh interlayer inside the protective cap body and the support bottom plate to be electrically connected, and the electric potentials of the metal mesh interlayer inside the protective cap body and the metal mesh interlayer inside the support bottom plate are equal.

Further setting: and the bottom surface of the supporting bottom plate is provided with a grounding pin, and the grounding pin penetrates into the supporting bottom plate and is coupled with the metal mesh interlayer.

Through adopting above-mentioned technical scheme, when not setting up ground pin, will make the whole polarization that takes place of metal mesh when external RF radiates the reinforce, at one side gathering positive charge, gather the negative charge in relative one side, and produce the electric field in inside, when RF radiation intensity constantly changes, the electric field of change still can the corresponding magnetic field that changes that produces to lead to the fact the influence to the crystal oscillator body. When the whole metal net is grounded through the grounding pin, the potential of the whole metal net is kept to be zero, and polarization is not easy to occur, so that the RF radiation resistance is greatly improved.

In addition, the quartz crystal oscillator piece has the characteristic of generating mechanical vibration under specific frequency, and the vibration can cause the crystal oscillator body to rub against the supporting bottom plate or the protective cap body, so that static electricity is generated. The grounding pin is beneficial to leading out static electricity in the accommodating cavity, so that the interference of the static electricity to the circuit work is reduced, and a stronger ESD protection effect is achieved.

Further setting: the bottom surface of the supporting bottom plate is provided with a sleeve corresponding to the through hole, and the support legs of the crystal oscillator body penetrate through the sleeve and are in sliding connection with the sleeve.

Through adopting above-mentioned technical scheme, the sleeve pipe has increased crystal oscillator body and supporting baseplate's area of contact with the stabilizer blade looks butt of crystal oscillator body for on the vibration energy that crystal oscillator body produced can transmit supporting baseplate and the protective cap body effectively, can learn by momentum conservation law and energy conservation law, when the mass increase of vibration object, the range of vibration will reduce, thereby reduced the static that the friction produced.

Further setting: the crystal oscillator body is connected with the supporting bottom plate through the heat-conducting silica gel pad.

Through adopting above-mentioned technical scheme, the crystal oscillator body produces certain heat at the during operation, and inclosed holding cavity will hinder thermal diffusion, and heat conduction silica gel pad can effectively conduct the heat of crystal oscillator body on pin and supporting baseplate to strengthen the heat dissipation. In addition, the heat-conducting silica gel pad has certain elasticity, can absorb the vibration that the crystal oscillator body produced, reduces the static that the friction produced.

Further setting: the bottom surface of supporting baseplate is provided with the ladder groove, the degree of depth in ladder groove is less than the inside metal mesh intermediate layer of supporting baseplate distance to the supporting baseplate bottom surface, the ground connection pin sets up in the ladder inslot and welds with the metal mesh intermediate layer, the ladder inslot intussuseption is filled with the insulating colloid with supporting baseplate bottom surface looks parallel and level.

Through adopting above-mentioned technical scheme, insulating glue sets up in the ladder inslot, and is great with the area of contact of ladder inslot wall, can effectively improve the power of being connected of ground connection pin and supporting baseplate. In addition, the insulating colloid also has a protective effect on welding points, and the crystal oscillator failure caused by the fracture of the welding points due to long-term vibration is avoided.

Further setting: the conductive colloid is conductive silica gel.

By adopting the technical scheme, the conductive silica gel has good conductive performance, strong connecting force and difficult aging.

To sum up, the utility model discloses following beneficial effect has:

1. the crystal oscillator can effectively shield external RF radiation outside the accommodating cavity, has a protection effect on the crystal oscillator body in the accommodating cavity, and avoids the adverse effect of high-strength RF radiation or a severely changed electric field and magnetic field on the work of the crystal oscillator;

2. the vibration generated by the crystal oscillator body can be reduced and absorbed, and static electricity generated by the vibration is led out, so that the ESD protection capability is strong;

3. simple and stable structure and long service life.

Drawings

Fig. 1 is a schematic structural diagram of a crystal oscillator having ESD protection and RF radiation shielding functions according to this embodiment.

In the figure, the position of the upper end of the main shaft,

1. a crystal oscillator body;

2. a support base plate; 21. a through hole; 22. a sleeve; 23. a connecting ring groove; 24. a conductive colloid; 240. conductive silica gel; 25. a heat-conducting silica gel pad; 26. a stepped groove; 27. insulating colloid; 28. a ground pin;

3. a protective cap body;

4. an accommodating cavity;

5. and a metal mesh interlayer.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the crystal oscillator with ESD protection and RF radiation shielding functions includes a crystal oscillator body 1 carrying a circuit, a supporting base plate 2 disposed on a bottom surface of the crystal oscillator body 1, and a protection cap body 3 abutting against a top surface of the supporting base plate 2, wherein the protection cap body 3 and the supporting base plate 2 cooperate with each other to form an accommodating cavity 4 for accommodating the crystal oscillator body 1.

Referring to fig. 1, the support base plate 2 may be a circular plate, a square plate or a flat plate with other shapes, and a square plate is selected in this embodiment. Accordingly, the protective cap body 3 may be a round cap, a square cap or a cap body with other shapes, and a square cap is selected in the embodiment. The crystal oscillator body 1 and the supporting base plate 2 are connected with each other through a heat-conducting silica gel pad 25. The crystal oscillator body 1 generates certain heat during working, the closed accommodating cavity 4 can block the diffusion of the heat, and the heat conducting silica gel pad 25 can effectively conduct the heat of the crystal oscillator body 1 to the pins and the supporting bottom plate 2, so that the heat dissipation is enhanced. In addition, the heat-conducting silica gel pad 25 has certain elasticity, can absorb the vibration generated by the crystal oscillator body 1, reduces the static electricity generated by friction, and improves the ESD protection capability.

With continued reference to fig. 1, the interior of the protective cap 3 and the support base 2 is provided with a sandwich of metal mesh 5, which is made up of metal wires which are interlaced with each other. The top surface of the supporting base plate 2 is provided with a connecting ring groove 23 for embedding the protective cap body 3, the connecting ring groove 23 is arranged around the top surface of the supporting base plate 2, and the depth of the connecting ring groove 23 is greater than the distance from the top surface of the supporting base plate 2 to the metal net interlayer 5 in the supporting base plate 2. The conductive colloid 24 is arranged inside the connecting ring groove 23, in this embodiment, the conductive colloid 24 is conductive silica gel 240, the conductive colloid 24 bonds the part of the protective cap body 3 inserted into the connecting ring groove 23 and the supporting base plate 2, so that the metal mesh interlayer 5 in the supporting base plate 2 and the metal mesh interlayer 5 in the protective cap body 3 form a unified whole, the potential on the whole is equal everywhere, and the nature of the RF radiation is electromagnetic wave, and the electric field and the magnetic field vibrate repeatedly in the direction perpendicular to the propagation direction of the RF radiation, so that the electric field cannot vibrate again when the RF radiation encounters the whole, and the RF radiation is blocked outside the whole, and therefore the protective cap body 3 and the metal mesh interlayer 5 inside the supporting base plate 2 cooperate with each other to achieve the effect of shielding the RF radiation, and thus the stability and reliability of the crystal oscillator are ensured.

With continued reference to fig. 1, the bottom surface of the supporting base plate 2 is provided with a through hole 21 for the pin of the crystal oscillator body 1 to pass through, and a sleeve 22 corresponding to the through hole 21, and the leg of the crystal oscillator body 1 passes through the sleeve 22 and is slidably connected with the sleeve 22. The bottom surface of supporting baseplate 2 is provided with ladder groove 26 and installs the ground pin 28 in ladder groove 26, and the degree of depth in ladder groove 26 is less than the inside metal mesh intermediate layer 5 of supporting baseplate 2 and to the distance of supporting baseplate 2 bottom surface, and ground pin 28 sets up in ladder groove 26 and welds with metal mesh intermediate layer 5, and ladder groove 26 intussuseption is filled with the insulating colloid 27 with supporting baseplate 2 bottom surface looks parallel and level.

The above-mentioned embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the present invention.

Claims (7)

1. The utility model provides a crystal oscillator with ESD protection and shielding RF radiation function, its characterized in that, includes crystal oscillator body (1), supporting baseplate (2) and butt in the protection cap body (3) of supporting baseplate (2) top surface, the protection cap body (3) and supporting baseplate (2) mutually support and form holding cavity (4) that are used for holding crystal oscillator body (1), the inside of the protection cap body (3) and supporting baseplate (2) all is provided with metal mesh intermediate layer (5), the inside metal mesh intermediate layer (5) electric connection of the protection cap body (3) and supporting baseplate (2), supporting baseplate (2) bottom is provided with through-hole (21) that supply crystal oscillator body (1) pin to pass.

2. The crystal oscillator with ESD protection and RF radiation shielding functions as claimed in claim 1, wherein the supporting base plate (2) is provided with a connecting ring groove (23) on the top surface for embedding the protection cap body (3), and the connecting ring groove (23) is provided with a conductive colloid (24) for electrically connecting the protection cap body (3) and the supporting base plate (2).

3. A crystal oscillator with ESD protection and RF radiation shielding functionality according to claim 2, characterized in that the bottom surface of the supporting substrate (2) is provided with a ground pin (28), the ground pin (28) penetrating into the inside of the supporting substrate (2) and being coupled to the metal mesh sandwich (5).

4. The crystal oscillator with ESD protection and RF radiation shielding functions as claimed in claim 3, wherein the bottom surface of the supporting base plate (2) is provided with a sleeve (22) corresponding to the through hole (21), and the legs of the crystal oscillator body (1) pass through the sleeve (22) and are slidably connected with the sleeve (22).

5. The crystal oscillator with ESD protection and shielding against RF radiation according to claim 4, characterized in that the crystal oscillator body (1) and the supporting baseplate (2) are connected to each other by a thermally conductive silicone pad (25).

6. The crystal oscillator with functions of ESD protection and shielding against RF radiation according to claim 5, wherein the bottom surface of the supporting substrate (2) is provided with a stepped groove (26), the depth of the stepped groove (26) is smaller than the distance from the metal mesh interlayer (5) inside the supporting substrate (2) to the bottom surface of the supporting substrate (2), the grounding pin (28) is disposed in the stepped groove (26) and welded to the metal mesh interlayer (5), and the stepped groove (26) is filled with an insulating colloid (27) flush with the bottom surface of the supporting substrate (2).

7. A crystal oscillator with ESD protection and shielding against RF radiation according to claim 6, characterized in that the conductive gel (24) is a conductive silicone gel (240).

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