Surface-mounted quartz crystal resonator with built-in load capacitor

Abstract

The utility model relates to the technical field of resonators, and discloses a surface-mounted quartz crystal resonator with a built-in load capacitor, which structurally comprises a positioning sheet and a positioning area, the positioning area extends towards the center of a substrate, and the positioning area sinks downwards. The base comprises a prefabricated groove which is arranged along the edge and corresponds to the bottom end of the top cover, and a stabilizing groove which is arranged in the prefabricated groove and extends towards the lower part of the base. The top cover and the substrate are bonded by adding a bonding substance into a wedge-shaped notch of the prefabricated groove, the air tightness of the resonator is ensured when the top cover and the substrate are bonded due to the characteristic that the top cover is placed in the stabilizing groove, and the quartz wafer can be clamped after being placed in a positioning area where the quartz wafer is placed, and then the quartz wafer is fixed by coating conductive silver adhesive. And the stability of the quartz wafer in the resonator is further ensured when the equipment shakes while the non-inclination is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of resonators, in particular to a surface mounted quartz crystal resonator with built-in load capacitance. Background Art

[0002] A resonator is an electronic component that generates a resonant frequency. Commonly used ones are quartz crystal resonators and ceramic resonators. They generate frequencies and are stable and have good anti-interference performance. They are widely used in various electronic products. The frequency accuracy of quartz crystal resonators is higher than that of ceramic resonators, but the cost is also higher than that of ceramic resonators. Resonators mainly play the role of frequency control. All electronic products involving frequency transmission and reception require resonators. Resonators can be divided into two types according to their appearance: direct plug-in and patch types. Existing resonators generally use a two-point fixing method. When this method is used on mobile vehicles, the crystal often becomes loose due to jitter or collision, which makes the resonator work poorly. In addition, the crystal itself cannot be positioned when fixed, which makes it easy to shift after installation, affecting the resonance effect. Therefore, a surface mount quartz crystal resonator with built-in load capacitor is urgently needed. Utility Model Content

[0003] 1. Technical Problems to be Solved by the Utility Model

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a surface-mounted quartz crystal resonator with built-in load capacitance, which has the advantage of using a positioning piece that is easy to install and clamp to fix the internal quartz chip to prevent it from shifting due to external stress, thus solving the problem that the internal chip of the resonator is easily shifted by external force and affects the working effect.

[0005] 2. Technical solution

[0006] To solve the above problems, the utility model adopts the following technical solutions.

[0007] A surface mounted quartz crystal resonator with built-in load capacitance comprises a top cover, a base, a conductive sheet fixed on one side of the base and electrically connected to a circuit board, and a positioning sheet and a bracket installed on the other side of the base.

[0008] As an optimization, the positioning plate includes a positioning area extending toward the center of the substrate, and this area is sunken downward. By utilizing the structural characteristics of the sunken positioning area, when the resonator is affected by external stress, the two corner ends of the quartz chip are engaged in the positioning area to enable the quartz chip to be firmly placed in the placement area.

[0009] As an optimization, the base includes a prefabricated groove along the edge corresponding to the bottom end of the top cover, and a stabilizing groove arranged in the prefabricated groove and extending downward to the base. The top cover is initially placed in the stabilizing groove corresponding to the bottom end, and then an adhesive is added to the wedge-shaped groove extending toward the outside of the base from the prefabricated groove. The top cover and the base are fixed with the adhesive while ensuring the air tightness of the resonator.

[0010] As an optimization, a quartz wafer is placed between the positioning plate and the bracket, and two corner ends on one side of the quartz wafer are located in the positioning area and coated with conductive silver glue for fixation.

[0011] As an optimization, the surface of the quartz wafer is coated with a thin layer of metal that facilitates the electrical connection between the two electrodes.

[0012] As an optimization, the conductive sheet uses a notch set on one side of the sheet to distinguish the positive and negative poles, and the notch is used to ensure that the problem of reverse connection of the poles will not occur when the resonator is installed.

[0013] As an optimization, both the base and the top cover are made of conductive ceramic.

[0014] As an optimization, the prefabricated groove has a wedge-shaped notch extending toward the outside of the substrate.

[0015] As an optimization, the positioning area and the bracket are located at the same level to ensure that the quartz wafer will not be tilted when placed.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the advantages of the surface mounted quartz crystal resonator with built-in load capacitor of the utility model are:

[0018] (1) When installing the resonator, the top cover is initially placed in a stable groove corresponding to the top cover, and then an adhesive material is added to the resonant groove extending from the prefabricated groove to the outside of the base to bond the top cover to the base. Due to the characteristic of the top cover being placed in the stable groove, the airtightness of the resonator is ensured when the two are bonded.

[0019] (2) Using the positioning plate and positioning area for placing the quartz chip, the quartz chip can be placed in the positioning area and fixed, and then the conductive silver glue is applied to fix the quartz chip. The positioning area and the bracket are at the same level to ensure that they are not tilted and further prevent the stability of the quartz chip inside the resonator when the device is shaken during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a surface-mounted quartz crystal resonator with built-in load capacitance of the utility model;

[0021] Figure 2It is a structural schematic diagram of the lower oblique side of the resonator of the utility model;

[0022] Figure 3 It is a schematic diagram of the internal structure of the resonator of the utility model;

[0023] Figure 4 It is a schematic diagram of the structure inside the quartz wafer of the utility model;

[0024] Figure 5 It is a structural schematic diagram of a half-section of a resonator of the utility model;

[0025] Figure 6 It is a structural schematic diagram of the positioning piece of the utility model.

[0026] Reference numerals in the figure: 1, top cover; 3, base; 5, conductive sheet; 15, positioning sheet; 39, bracket; 99, positioning area; 71, prefabricated groove; 75, stabilizing groove; 10, quartz wafer; 59, metal thin layer; DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example

[0029] See also Figure 1-6 A surface mounted quartz crystal resonator with built-in load capacitance comprises a top cover 1, a base 3, a conductive sheet 5 fixed on one side of the base 3 and electrically connected to a circuit board, a positioning sheet 15 and a bracket 39 installed on the other side of the base 3.

[0030] In this embodiment, the positioning sheet 15 includes a positioning area 99 extending toward the center of the substrate 3, and this area is sunken downward.

[0031] By utilizing the structural feature of the sunken positioning area 99, when the resonator is affected by external stress, the two corners of the quartz wafer 10 are engaged in the positioning area 99 to enable the quartz wafer 10 to be firmly placed in the placement area.

[0032] In this embodiment, the base 3 includes a prefabricated groove 71 opened along the edge thereof and corresponding to the bottom end of the top cover 1 , and a stabilizing groove 75 arranged in the prefabricated groove 71 and extending downward from the base 3 .

[0033] Initially, the top cover 1 is placed in the stabilizing groove 75 corresponding to the bottom end, and then an adhesive is added to the wedge-shaped groove extending from the prefabricated groove 71 to the outside of the base 3, so that the top cover 1 and the base 3 are fixed with the adhesive while ensuring the airtightness of the resonator.

[0034] In this embodiment, the quartz wafer 10 is placed between the positioning plate 15 and the bracket 39, and the two corner ends of one side of the quartz wafer 10 are located in the positioning area 99 and are coated with conductive silver glue for fixation.

[0035] In this embodiment, the surface of the quartz wafer 10 is coated with a metal thin layer 59 which is beneficial for connecting the two electrodes electrically.

[0036] In this embodiment, the conductive sheet 5 uses a notch provided on one side of the sheet body to distinguish the positive and negative poles, and the notch is used to ensure that the problem of reverse connection of the two poles will not occur when the resonator is installed.

[0037] In this embodiment, the base 3 and the top cover 1 are both made of conductive ceramics.

[0038] In this embodiment, the prefabricated groove 71 has a wedge-shaped notch extending toward the outside of the base 3 .

[0039] In this embodiment, the positioning area 99 and the support 39 are located at the same level to ensure that the quartz wafer 10 will not be tilted when placed.

[0040] When making a resonator:

[0041] The quartz wafer 10 is placed in the positioning area 99 reserved on the positioning sheet 15. Since the positioning area 99 is sunken in the positioning sheet 15, there is a height difference between the two, so that the quartz wafer 10 can be stuck in the positioning sheet 15, and the other end is attached to the bracket 39 on one side of the base 3, so that the quartz wafer 10 keeps a horizontal position without tilting, and then the conductive silver glue is applied to the positioning area 99, and the covering area contacts the quartz wafer 10 and the positioning sheet 15, thereby fixing the quartz wafer 10 in the base 3, and then the top cover 1 is covered;

[0042] When installing the top cover 1, first place the lower part of the cover into the stabilizing groove 75 extending downward from the prefabricated groove 71, and then add adhesive and fixing material into the wedge-shaped groove extending from the prefabricated groove 71 to the outside of the substrate 3, and bond and fix the top cover 1 to the substrate 3, thereby improving the airtightness of the resonator.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A surface-mounted quartz crystal resonator with built-in load capacitance, comprising a top cover (1), a base (3), a conductive sheet (5) fixed on one side of the base (3) and electrically connected to a circuit board, a positioning sheet (15) and a bracket (39) mounted on the other side of the base (3), characterized in that: The positioning sheet (15) includes a positioning area (99) extending toward the center of the base (3), and the area is sunken downward; The base (3) comprises a prefabricated groove (71) provided along the edge thereof and corresponding to the bottom end of the top cover (1), and a stabilizing groove (75) arranged in the prefabricated groove (71) and extending downwardly from the base (3).

2. The surface mount quartz crystal resonator with built-in load capacitance according to claim 1, characterized in that: A quartz wafer (10) is placed between the positioning plate (15) and the bracket (39), and two corner ends of one side of the quartz wafer (10) are located in the positioning area (99) and are coated with conductive silver glue for fixation.

3. The surface mount quartz crystal resonator with built-in load capacitance according to claim 2, characterized in that: The surface of the quartz wafer (10) is coated with a metal thin layer (59) which is conducive to electrical connection between the two electrodes.

4. The surface mount quartz crystal resonator with built-in load capacitance according to claim 1, characterized in that: The conductive sheet (5) uses a notch provided on one side of the sheet body to distinguish between positive and negative pole contacts.

5. The surface mount quartz crystal resonator with built-in load capacitance according to claim 1, characterized in that: The base (3) and the top cover (1) are both made of conductive ceramics.

6. The surface mount quartz crystal resonator with built-in load capacitance according to claim 1, characterized in that: The prefabricated groove (71) has a wedge-shaped notch extending toward the outside of the base (3).

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