Quartz crystal resonator with no resonance peak, vibration and shock resistance

Abstract

A quartz crystal resonator with no resonance peak, which is resistant to vibration and impact, comprises a housing composed of an upper cover and a base, a quartz crystal resonator, an upper gold wire braided ring and a lower gold wire braided ring clamping the quartz crystal resonator from the front and back sides, the upper surface of the upper gold wire braided ring is connected to the inner side of the upper cover, and the lower gold wire braided ring is placed on the base; the inner sides of the base and the upper cover are plated with a conductive film; a first through hole is opened at the connection between the base and the upper cover, a first electrode is arranged in the first through hole, and the first electrode is connected to the conductive film on the upper cover; a second through hole is opened at the part of the base plated with the conductive film, a second through hole is arranged in the second through hole, and the second electrode is connected to the conductive film on the upper cover. The present invention has a good vibration isolation effect and will not cause resonance.

Description

Technical field:

[0001] The present invention relates to a quartz crystal resonator Technical background:

[0002] Quartz crystal resonators are the core components of frequency reference sources in modern electronic communication information systems. With the continuous development of electronic technology, the application scenarios of quartz crystal resonators have also expanded from static environments such as wireless broadcasting stations to dynamic environments such as aerospace, automobiles, and military industries. However, these application environments are harsh, like purgatory, such as high and low temperatures, vibration, and shock. This harsh working environment will seriously affect the reliability of quartz crystal resonators. How to improve the resistance of quartz crystal resonators to environmental interference has become a problem that designers need to solve.

[0003] In particular, the problem of vibration and shock resistance has always troubled designers. In applications such as vehicles, they are often subjected to severe vibration and shock, which will cause the performance of the quartz crystal resonator to fail or even damage the quartz crystal resonator. In order to reduce the impact of vibration and shock on the working reliability of the quartz crystal resonator, the existing technology mainly performs vibration isolation on the installation of the quartz crystal resonator.

[0004] Vibration isolation for the installation of quartz crystal resonators refers to isolating the base of the quartz crystal resonator and the circuit board through vibration isolation materials. The vibration of the vibration isolation material will absorb energy, so that the vibration cannot be effectively transmitted to the quartz crystal resonator, which is sensitive to vibration and shock. However, for various applications, the pursuit of miniaturization and lightweight has strict requirements on volume and weight, but this method is more complicated, large in size, occupies a large space, and has additional weight and high cost.

[0005] At present, the existing technology is to perform vibration isolation treatment on the installation and connection of the quartz crystal resonator. It starts from the outside of the quartz crystal resonator and adds a vibration isolation device to reduce the vibration and impact transmitted to the quartz crystal resonator. The vibration and impact resistance of the quartz crystal resonator product itself has not been improved. Therefore, in order to reduce the impact of vibration and impact on the working reliability of the quartz crystal resonator, the most important method is to directly protect the quartz wafer, perform anti-vibration and anti-impact treatment from the inside of the quartz crystal resonator, and improve the vibration and impact resistance of the quartz crystal resonator itself.

[0006] Traditional quartz crystal resonators are connected to ceramic bases through conductive glue. After the conductive glue is cured, it becomes a brittle material, so it is a rigid connection with poor vibration and impact resistance. The quartz crystal is very easy to be damaged. Summary of the invention:

[0007] The present invention aims to overcome the above-mentioned disadvantages of the prior art and proposes a vehicle-mounted quartz crystal resonator with a gold wire braided ring for vibration reduction and no resonance peak, which is resistant to vibration and impact.

[0008] The present invention adds a flexible body, a gold wire braided ring, between the quartz crystal resonator and the ceramic base. The gold wire braided ring not only plays a conductive role, but also serves as a flexible body supported between the quartz crystal resonator and the ceramic base. Since the gold wire braided ring has good flexibility, it can improve the vibration resistance and impact resistance of the quartz crystal resonator.

[0009] Although the flexible structure has the advantages of low natural frequency and good vibration isolation performance, it has a very obvious resonance peak at the resonance frequency, which will amplify the vibration. The present invention is a flexible structure with large damping, and the natural frequency is also very low, but at the resonance frequency, there is no obvious resonance peak (i.e., no resonance peak). This structure can have a good vibration isolation effect and will not cause resonance.

[0010] The production of the gold wire braided ring is as follows: first, the gold wire is braided into a tubular belt (similar to shoelaces), a certain length is taken, it is looped around the city, and the two ends are welded together to form a ring. Its internal structure can dissipate a lot of energy and play a role in vibration reduction, and it has good conductivity, good flexibility and large damping.

[0011] The vibration-resistant and impact-resistant quartz crystal resonator without resonance peak of the present invention comprises a shell composed of an upper cover 1 buckled with a base 2, and a quartz crystal resonator 5, and is characterized in that an upper gold wire braided ring 3 and a lower gold wire braided ring 4 clamp the quartz crystal resonator 5 from the front and back sides, the upper surface of the upper gold wire braided ring 3 is connected to the inner side of the upper cover 1, and the lower gold wire braided ring 4 is placed on the base 2; the inner sides of the base 2 and the upper cover 1 are plated with conductive films; a first through hole 82 is opened at the connection between the base 1 and the upper cover 1, a first electrode 72 is arranged in the first through hole 82, and the first electrode 72 is connected to the conductive film 61 on the upper cover 1; a second through hole 81 is opened at the portion of the base 1 plated with the conductive film 62, a second through hole 81 is arranged in the second through hole 81, and the second electrode 71 is connected to the conductive film 61 on the upper cover 1.

[0012] Preferably, the upper cover 1 presses the upper gold wire braided ring 3 onto the quartz crystal resonator 5 , so that pre-pressure exists among the upper cover 1 , the upper gold wire braided ring 3 , the quartz crystal resonator 5 , the lower gold wire braided ring 4 , and the base 2 in sequence.

[0013] Preferably, the upper cover 1 , the quartz crystal resonator 5 , and the base 2 are square, and the upper gold wire braided ring 3 and the lower gold wire braided ring 4 are circular.

[0014] Preferably, the outer diameter of the upper gold wire braided ring 3 is equal to the inner diameter of the upper cover 1 .

[0015] Preferably, the base 2 is made of ceramic.

[0016] The vehicle-mounted gold wire braided ring shock absorber structure of the present invention includes a quartz crystal resonator 5, two gold wire braided rings 3 and 4, an upper cover 1 and a conductive film 61, a ceramic base 2 and a conductive film 62. The ceramic base is provided with through holes 81 and 82 and electrodes 71 and 72. The ceramic base 2 coated with a conductive film is connected to the lower surface of the lower gold wire braided ring 4, the upper surface of the lower gold wire braided ring 4 is connected to the lower surface of the quartz crystal resonator 5, the upper surface of the quartz crystal resonator 5 is connected to the lower surface of the upper gold wire braided ring 3, and the upper surface of the upper gold wire braided ring 3 is connected to the upper cover 1 coated with a conductive film. Conductive metal is injected into the through hole on the base 2. Since the gold wire braided ring has good conductivity, the ceramic base and the upper cover are both coated with conductive film, so the traditional glue dispensing process can be omitted. In order to prevent the gold wire braided ring and the quartz crystal resonator from being out of contact due to vibration during use and to ensure the normal operation of the vehicle-mounted circuit module, the gold wire braided ring is pre-pressed. The gold wire braided ring not only has good conductivity, but also has good flexibility, and can play a role in vibration isolation and impact resistance. In addition, the gold wire braided ring also has a large damping, and its energy dissipation effect can effectively reduce the vibration amplitude and suppress resonance. The gold wire braided ring vibration damper achieves the vibration reduction function through the slip and friction between the gold wires of the gold wire braided ring. When the quartz crystal resonator vibrates, the vibration damper produces dynamic displacement, and friction damping is generated between the gold wires of the gold wire braided ring, thereby reducing vibration.

[0017] The invention has the advantages of having a good vibration isolation effect and not causing resonance. Description of the drawings:

[0018] Figure 1 It is a schematic diagram of the combination of the gold wire braided ring and the quartz crystal resonator of the present invention.

[0019] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 3 It is a cross-sectional view of the present invention.

[0021] Figure 4 It is a top view of the base of the present invention.

[0022] Figure 5 It is a schematic diagram of the kinetic model of the present invention.

[0023] Figure 6 It is the frequency response diagram of the quartz crystal movement of the present invention. Specific implementation method:

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The vibration-resistant and impact-resistant quartz crystal resonator without resonance peak of the present invention comprises a shell composed of an upper cover 1 buckled with a base 2, and a quartz crystal resonator 5, and is characterized in that an upper gold wire braided ring 3 and a lower gold wire braided ring 4 clamp the quartz crystal resonator 5 from the front and back sides, the upper surface of the upper gold wire braided ring 3 is connected to the inner side of the upper cover 1, and the lower gold wire braided ring 4 is placed on the base 2; the inner sides of the base 2 and the upper cover 1 are plated with conductive films; a first through hole 82 is opened at the connection between the base 1 and the upper cover 1, a first electrode 72 is arranged in the first through hole 82, and the first electrode 72 is connected to the conductive film 61 on the upper cover 1; a second through hole 81 is opened at the portion of the base 1 plated with the conductive film 62, a second through hole 81 is arranged in the second through hole 81, and the second electrode 71 is connected to the conductive film 61 on the upper cover 1.

[0028] The upper cover 1 presses the upper gold wire braided ring 3 onto the quartz crystal resonator 5, so that pre-pressure exists in sequence among the upper cover 1, the upper gold wire braided ring 3, the quartz crystal resonator 5, the lower gold wire braided ring 4, and the base 2. The upper cover 1, the quartz crystal resonator 5, and the base 2 are square, and the upper gold wire braided ring 3 and the lower gold wire braided ring 4 are circular.

[0029] The outer diameter of the upper gold wire braided ring 3 is equal to the inner diameter of the upper cover 1, so that the side surface of the upper gold wire braided ring 3 is also connected to the conductive film 61 on the upper cover 1 to enhance the conductivity. The base 2 is made of ceramic material.

[0030] The dynamic system model of the non-resonance peak anti-vibration and anti-shock quartz crystal resonator of the present invention is as follows: Figure 5 shown.

[0031] y(t) is the sinusoidal displacement excitation applied to the ceramic base, m is the mass of the quartz crystal resonator, c is the damping coefficient produced by the gold wire braided ring, and k is the stiffness coefficient of the gold wire braided ring.

[0032] Mass m = 0.9 g

[0033] The diameter of each gold wire in the gold wire braided ring is d = 25 μm

[0034] Stiffness k = 180 N mm

[0035] Natural frequency

[0036]

[0037] y(t)=Ysin(ωt)

[0038]

[0039] Frequency response of fundamental vibration to the motion of a quartz crystal resonator: in

[0040] The present invention provides a quartz crystal resonator with a damping structure, which has better anti-vibration and anti-impact capabilities and can suppress resonance to reduce damage to the quartz crystal resonator.

Claims

1. A quartz crystal resonator without resonance peak, which is resistant to vibration and impact, comprises a housing composed of an upper cover (1) and a base (2), and a quartz crystal resonator (5), characterized in that: An upper gold wire braided ring (3) and a lower gold wire braided ring (4) clamp a quartz crystal resonator (5) from the front and back sides; the upper surface of the upper gold wire braided ring (3) is connected to the inner side of the upper cover (1), and the lower gold wire braided ring (4) is placed on the base (2); the inner sides of the base (2) and the upper cover (1) are plated with a conductive film; a first through hole (82) is opened at the connection between the base (2) and the upper cover (1), a first electrode (72) is arranged in the first through hole (82), and the first electrode (72) is connected to the conductive film (61) on the upper cover (1); a second through hole (81) is opened at the part of the base (2) plated with the conductive film (62), a second electrode (71) is arranged in the second through hole (81), and the second electrode (71) is connected to the conductive film (61) on the upper cover (1).

2. The vibration-resistant and shock-resistant quartz crystal resonator without resonance peak as claimed in claim 1, characterized in that: The upper cover (1) presses the upper gold wire braided ring (3) onto the quartz crystal resonator (5), so that pre-pressure exists in sequence among the upper cover (1), the upper gold wire braided ring (3), the quartz crystal resonator (5), the lower gold wire braided ring (4), and the base (2).

3. The vibration-resistant and shock-resistant quartz crystal resonator without resonance peak as claimed in claim 1, characterized in that: The upper cover (1), the quartz crystal resonator (5) and the base (2) are in a square shape, and the upper gold wire braided ring (3) and the lower gold wire braided ring (4) are in a circular shape.

4. The vibration-resistant and shock-resistant quartz crystal resonator without resonance peak as claimed in claim 1, characterized in that: The outer diameter of the upper gold wire braided ring (3) is equal to the inner diameter of the upper cover (1).

5. The vibration-resistant and shock-resistant quartz crystal resonator without resonance peak as claimed in claim 1, characterized in that: The base (2) is made of ceramic material.

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