Quartz crystal oscillator base and crystal oscillator using same

Abstract

The utility model belongs to the technical field of crystal oscillators, and particularly relates to a quartz crystal oscillator base. A quartz crystal oscillator base comprises a base body and further comprises a dispensing platform arranged on the base body, the upper surface of the dispensing platform is a slope face in the length direction of a resonance part, and the side, close to the free end of the resonance part, of the dispensing platform is higher than the side, away from the free end of the resonance part, of the dispensing platform. The base body is provided with a containing cavity used for containing a resonance part, and the free end of the resonance part tilts upwards under the action of the slope face of the dispensing platform. And the failure of the crystal oscillator caused by the contact between the resonance piece and the seat body in the use process is avoided, the service life is prolonged, and the yield is improved.

Description

Technical Field

[0001] This utility model relates to a ceramic base structure for crystal oscillators and a crystal oscillator using the same, belonging to the field of crystal oscillator technology. Background Technology

[0002] A quartz crystal resonator, or crystal oscillator for short, is an electronic component that uses the piezoelectric effect of quartz crystals to generate a high-precision oscillation frequency. Based on the lead configuration, it can be divided into two types: through-hole (with leads) and surface-mount (without leads).

[0003] Surface mount crystal oscillators mainly consist of a quartz crystal wafer, a base, and a cover plate. The wafer is the core component that determines the operating frequency of the final product. The purity of the wafer itself, the precision of its cutting dimensions, the temperature characteristics of the packaging material, its position on the base, the sealing performance of the package, its size, and its vibration resistance all affect the final performance of the crystal oscillator.

[0004] To fix the wafer in the base of the oscillator or resonator, adhesive is applied to a dispensing platform inside the ceramic substrate. One end of the wafer is then placed on the adhesive dot, and the wafer is fixed by the adhesive force of the dot. After fixing, the wafer is placed in a tunnel oven for thermosetting treatment to cure the adhesive and achieve a firm fixation of the wafer.

[0005] During thermosetting in a tunnel oven, the temperature is first raised to soften the colloid, maintained for a period of time, and then slowly lowered to allow the colloid to re-solidify. However, during production, we found that after the colloid is heated to its softening temperature during thermosetting, its fluidity increases, resulting in a poorer fixation effect on the wafer. Furthermore, the horizontal setting of the dispensing platform causes the free end of the resonator to easily tilt downwards due to gravity. In severe cases, the free end may tilt to the point of touching the base, leading to product failure and increasing the defect rate of the crystal oscillator.

[0006] Therefore, this application proposes a quartz crystal oscillator base to improve its service life and increase the yield rate. Utility Model Content

[0007] The purpose of this utility model is to provide a new technical solution: to provide a quartz crystal oscillator base to solve the problem of contact between the resonator and the base, thereby improving the yield of the crystal oscillator.

[0008] The technical solution provided by this utility model is as follows:

[0009] A quartz crystal oscillator base includes a base body and a dispensing platform disposed on the base body. The upper surface of the dispensing platform is a sloping surface along the length direction of the resonator. The side of the dispensing platform near the free end of the resonator is higher than the side of the dispensing platform away from the free end of the resonator. The base body is provided with a cavity for accommodating the resonator. The free end of the resonator is tilted upward under the action of the sloping surface of the dispensing platform.

[0010] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0011] The dispensing platform causes the free end of the resonator to tilt upwards, preventing the resonator from contacting the ceramic base during use and causing crystal failure. This increases its service life and improves the yield rate.

[0012] This utility model also provides another technical solution:

[0013] A quartz crystal oscillator base includes a base body, a dispensing platform and a lifting layer disposed on the base body, the base body having a cavity for accommodating a resonator, the fixed end of the resonator being connected to the dispensing platform, and the free end of the resonator being tilted upwards under the action of the lifting layer.

[0014] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0015] Raising the height causes the free end of the resonator to tilt upwards, preventing the resonator from contacting the ceramic base during use and causing crystal oscillator failure. This increases its service life and improves the yield rate.

[0016] Based on the above technical solution, the present invention can be further improved as follows.

[0017] Furthermore, the raised layer is disposed on the dispensing platform, and the raised layer is located on the side of the dispensing platform near the free end of the resonator.

[0018] The beneficial effect of adopting the above-mentioned further solution is that one end of the resonator is fixed by adhesive dots, and the middle part is supported by a raised layer, so that the free end of the resonator tilts upward.

[0019] Furthermore, the raised layer is an insulating layer.

[0020] The advantage of adopting the above-mentioned further solution is that it can prevent a short circuit between the two electrodes. Because the conductive adhesive on the electrodes of the raised layer and the dispensing platform is very close, and there are two mutually insulated adhesive dots on the dispensing platform, the raised layer is very likely to come into contact with the electrodes on the lower surface of the resonator. If the raised layer is simultaneously conductively connected to the electrodes on the upper surface of the resonator, it will cause a short circuit between the upper and lower electrodes of the resonator. Therefore, using insulating material can prevent a short circuit between the two electrodes.

[0021] Furthermore, the raised layer is a ceramic layer.

[0022] The beneficial effect of adopting the above-mentioned further solution is that the ceramic layer can be applied based on the printing process, and can be pre-processed when the ceramic base leaves the factory, without having to wait until the base is received to apply the lifting layer separately using the dispensing technology. Furthermore, it is difficult to accurately control the height of the lifting layer when using the dispensing technology. However, by setting the lifting layer as a ceramic layer, it can be applied based on the printing process. Since the thickness of each coat can be precisely controlled, the height of the lifting layer can be controlled more precisely, thus improving product consistency.

[0023] Furthermore, the width of the raised layer is greater than the width of the adhesive dot.

[0024] The beneficial effect of adopting the above-mentioned further solution is that the width of the raised layer is greater than the width of the adhesive dot. When applying adhesive, it is prevented from climbing to the side of the raised layer near the free end of the resonator. When the adhesive on the dispensing platform softens and diffuses, it will be intercepted by the relatively wide raised layer, thus preventing the softened adhesive from climbing along the resonator and affecting the performance of the crystal oscillator.

[0025] Furthermore, the thickness of the raised layer is 0.01 mm to 0.02 mm.

[0026] The beneficial effect of adopting the above-mentioned further solution is that by controlling the thickness of the raised layer between 0.01mm and 0.02mm, the free end of the resonator can be raised, and after being raised, the free end of the resonator will not touch the cover plate when vibrating in the packaged crystal oscillator, thus ensuring the normal use of the crystal oscillator.

[0027] This utility model also proposes a quartz crystal oscillator, including a cover plate, a resonator and the quartz crystal oscillator base, wherein the resonator is disposed in the cavity and the cover plate covers the quartz crystal oscillator base.

[0028] Furthermore, the cover plate has a flat plate structure.

[0029] The advantages of adopting the above-mentioned further solutions are that using a crystal oscillator base with a cavity structure can provide better mechanical support and fixation, and enhance the mechanical stability of the crystal oscillator package; at the same time, the flat cover plate is easy to process, and also easy to position, install and paste, thus improving work efficiency.

[0030] Furthermore, the cover plate is made of insulating material.

[0031] The use of an insulating cover plate prevents the conductive adhesive applied on the dispensing platform from touching the cover plate and causing a short circuit in the resonator. Attached Figure Description

[0032] Figure 1 This is a schematic diagram showing the positional relationship between the dispensing platform, the resonator, and the adhesive dots in the prior art.

[0033] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0034] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle;

[0035] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0036] Figure 5 This utility model Figure 4 Enlarged view of point B in the middle;

[0037] Figure 6 This is a schematic diagram of the structure of Embodiment 3 of this utility model;

[0038] Figure 7 This utility model Figure 6 Enlarged view of point C in the middle;

[0039] Figure 8 This is a top view of the present invention;

[0040] Figure 9 This is a schematic diagram of the quartz crystal oscillator of this utility model.

[0041] In the diagram: 1. Dispensing platform; 2. Resonator; 3. Glue dot; 4. Raised platform; 5. Base; 6. Cover plate. Detailed Implementation

[0042] The principles and features of this utility model are described below with reference to examples. The examples are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0043] Figure 1 This is a schematic diagram showing the structural relationship between the base 5, the dispensing platform 1, and the resonator 2 in the existing crystal oscillator structure.

[0044] Example 1:

[0045] like Figures 2-3As shown, a quartz crystal oscillator base includes a base body 5 and a dispensing platform 1 disposed on the base body 5. The upper surface of the dispensing platform 1 is a sloping surface along the length direction of the resonant element 2. The side of the dispensing platform 1 near the free end of the resonant element 2 is higher than the side of the dispensing platform 1 away from the free end of the resonant element 2. The base body 5 is provided with a cavity for accommodating the resonant element 2. The free end of the resonant element 2 is tilted upward under the action of the sloping surface of the dispensing platform 1.

[0046] The fixed end of the resonator 2 is fixed to the dispensing platform 1 via adhesive dots 3. The dispensing platform 1 is a sloping surface that tilts upwards along the direction of the resonator 2, causing the free end of the resonator 2 to tilt upwards at an angle of 3° to 5°. Within the set tilt angle range, this prevents the resonator 2 from contacting the base 5 during vibration, thus avoiding crystal oscillator failure, increasing its service life, and improving the yield rate. The base 5 has an internal cavity structure, and the resonator 2 is placed inside the cavity, which better protects the resonator 2, provides better mechanical support and fixation, and enhances the mechanical stability of the crystal oscillator package.

[0047] Example 2:

[0048] like Figures 4-5 As shown, a quartz crystal oscillator base includes a base body 5, a dispensing platform 1 and a lifting layer 4 disposed on the base body 5. The lifting layer 4 is located to the right of the dispensing platform 1 and is made of an insulating ceramic layer. One end of the resonator 2 is fixed by an adhesive dot 3, and the middle part is supported by the lifting layer 4. Since the ceramic layer can be applied using a printing process, the thickness of each layer can be precisely controlled. This allows the height of the lifting layer 4 to be controlled so that the free end of the resonator 2 tilts upward at an angle of 3° to 5°, preventing the resonator 2 from contacting the base body 5 during use, which could lead to crystal oscillator failure. This increases its service life and improves the yield rate.

[0049] Example 3:

[0050] like Figures 6-8 As shown, a quartz crystal oscillator base includes a base body 5, and also includes a dispensing platform 1 and a lifting layer 4 disposed on the base body 5. The lifting layer 4 is disposed on the dispensing platform 1 and is located on the side of the dispensing platform 1 near the free end of the resonator 2. One end of the resonator 2 is fixed by a glue dot 3, and the middle part is supported by the lifting layer 4, so that the free end of the resonator 2 is tilted upward, so as to prevent the resonator 2 from contacting the base body 5 during vibration, which would cause the crystal oscillator to fail.

[0051] The raised layer 4 is fixed to the right side of the dispensing platform 1 using a ceramic printing method. The edges of the raised layer 4 do not extend beyond the edges of the dispensing platform 1, and the width of the raised layer 4 is greater than the width of the adhesive dot 3. During adhesive application, this prevents the adhesive from climbing up to the side of the raised layer 4 near the free end of the resonator 2. When the adhesive on the dispensing platform 1 softens and spreads, it is intercepted by the relatively wide raised layer 4, preventing the softened adhesive from climbing along the resonator 2 and affecting the crystal oscillator's performance. The thickness of the raised layer 4 is 0.01mm to 0.02mm, the length of the resonator 2 is 3.63mm, and the distance from the free end of the resonator 2 after it is raised to the inner bottom surface of the base 5 is 0.14mm.

[0052] Example 4:

[0053] like Figure 9 As shown, a quartz crystal oscillator includes a cover plate 6 and a resonator 2, as well as the aforementioned quartz crystal oscillator base. The resonator 2 is disposed within the cavity, and the cover plate 6 covers the quartz crystal oscillator base. The cover plate 6 is a flat plate structure made of insulating material. Sealant is applied at the connection points between the cover plate 6 and the quartz crystal oscillator base around its perimeter. The quartz crystal oscillator base is bonded to the cover plate 6 through the sealant, forming a vacuum-sealed space. Using a crystal oscillator base with a cavity structure provides better mechanical support and fixation, enhancing the mechanical stability of the crystal oscillator package.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A quartz crystal oscillator base, comprising a base body (5), characterized in that: The invention also comprises a glue dispensing platform (1) arranged on the seat body (5), the upper surface of the glue dispensing platform (1) being a sloped surface along the length direction of the resonant component (2), the side of the glue dispensing platform (1) close to the free end of the resonant component (2) being higher than the side of the glue dispensing platform (1) away from the free end of the resonant component (2), the seat body (5) being provided with a cavity for accommodating the resonant component (2), the free end of the resonant component (2) being tilted upwards under the action of the sloped surface of the glue dispensing platform (1).

2. A quartz crystal oscillator base, comprising a base body (5), characterized in that: It also includes a glue dispensing platform (1) and a lifting layer (4) arranged on a base (5); the base (5) is provided with a cavity for accommodating a resonant component (2); a fixed end of the resonant component (2) is connected to the glue dispensing platform (1); and a free end of the resonant component (2) is tilted upward under the action of the lifting layer (4).

3. The quartz crystal oscillator base according to claim 2, characterized in that: The raised layer (4) is arranged on the glue dispensing platform (1), and the raised layer (4) is located on a side of the glue dispensing platform (1) close to the free end of the resonant component (2).

4. The quartz crystal oscillator base according to claim 2 or claim 3, characterized in that: The raised layer (4) is an insulating layer.

5. The quartz crystal oscillator base according to claim 4, characterized in that: The raised layer (4) is a ceramic layer.

6. The quartz crystal oscillator base according to claim 3, characterized in that: The width of the raised layer (4) is greater than the width of the glue point (3).

7. The quartz crystal oscillator base according to claim 6, characterized in that: The thickness of the raised layer (4) is 0.01 mm to 0.02 mm.

8. A quartz crystal oscillator, comprising a cover plate (6) and a resonant element (2), characterized in that: It also comprises a quartz crystal oscillator base as claimed in any one of claims 1 to 7, wherein the resonator (2) is arranged in the cavity, and the cover plate (6) covers the quartz crystal oscillator base.

9. The quartz crystal oscillator according to claim 8, characterized in that: The cover plate (6) is a flat plate structure.

10. The quartz crystal oscillator according to claim 9, characterized in that: The cover plate (6) is made of insulating material.

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