Low phase noise shock resistant crystal oscillator

Abstract

The utility model provides a low phase noise shock resistance crystal oscillator, including the shell, the shell inboard wall is equipped with the inner shell, the shell inside center position is equipped with the invar base, the invar base top center position is equipped with SC cutting quartz crystal, the electrode surface of SC cutting quartz crystal faces up, the seal door board of upper and lower activity is equipped in the shell upper, the carbon fiber suspension line is vertically equipped in the seal door board in -top wall center position, carbon fiber suspension line bottom end is connected with seal door board top surface center position. The utility model discloses reasonable in design, through the setting cooperation of connecting piece one, connecting piece two, support arm and support spring, can absorb horizontal vibration energy under the vibration frequency, in combination with the setting of piston boss and air damping cavity, piston boss compresses air and generates nonlinear damping force, absorbs vertical vibration energy, under the double shock resistance of horizontal and vertical, can avoid the vibration amplification phenomenon of transmission linear shock absorbing structure.

Description

Technical Field

[0001] This utility model mainly relates to the field of crystal oscillator technology, specifically to a low phase noise and vibration-resistant crystal oscillator. Background Technology

[0002] A crystal oscillator is a component that provides a highly stable AC signal for electronic devices. A crystal oscillator is made by cutting a thin slice from a quartz crystal at a certain orientation, polishing both ends of the slice and coating them with a conductive silver layer, then connecting two electrodes from the silver layer and encapsulating it.

[0003] During the operation of specific embodiments, the inventors discovered the following defects:

[0004] Chinese Patent Publication No. CN221767999U discloses a low phase noise crystal oscillator. By sleeved around the pins, and with the sound-absorbing wall in the middle of the sleeve connected to the filling cavity through a through hole, the noise generated by the vibration of the bottom pins of the crystal oscillator is absorbed by the sound-absorbing material of glass fiber, achieving ultra-low phase noise and providing a more stable frequency source for the equipment.

[0005] In the aforementioned mechanisms, vibration noise is absorbed by a single shock-absorbing component and a sleeve fitted with a pin. However, the mechanical fixing method of the crystal core component still provides three-dimensional isolation from the multi-dimensional vibration of the crystal, resulting in a significant increase in phase noise under high-frequency vibration.

[0006] It should be noted that the above content falls within the scope of the inventor's technical knowledge. Due to the vast and complex nature of the technical content in this field, the above content of this application does not necessarily constitute prior art. Utility Model Content

[0007] 1. The technical problem to be solved by the utility model:

[0008] This invention provides a low-phase-noise, vibration-resistant crystal oscillator to solve the technical problems existing in the background art.

[0009] 2. Technical Solution:

[0010] To achieve the above objectives, the technical solution provided by this utility model is as follows: a low phase noise anti-vibration crystal oscillator, comprising a housing, an inner shell on the inner sidewall of the housing, an Invar base at the center of the interior of the housing, an SC-cut quartz crystal at the top center of the Invar base with the electrode face upwards, a vertically movable sealing door plate above the housing, a carbon fiber suspension wire vertically disposed at the center of the inner top wall of the sealing door plate with the bottom end connected to the center of the top surface of the sealing door plate, multiple buffer components between the Invar base and the housing, an air damping cavity below the Invar base, a piston boss connected to the center of the bottom surface of the Invar base, the piston boss passing through the top of the air damping cavity and maintaining a gap with the inner bottom wall of the housing.

[0011] Furthermore, the buffer assembly includes a first connector and a second connector. The first connector is fixed to the side of the Invar base by bolts. The second connector is snapped to the inner wall of the inner shell. A support arm is provided between the first connector and the second connector, and a support spring is fixedly wound around the outer wall of the support arm.

[0012] Furthermore, a cross-shaped pressure relief groove is provided on the bottom surface of the Invar base.

[0013] Furthermore, the surface of the piston boss is provided with a spiral airflow channel.

[0014] Furthermore, both ends of the bottom surface of the SC-cut quartz crystal are connected with pins. The pins pass vertically through the interior of the Invar base and the air damping cavity, as well as the bottom of the inner and outer shells. The outer shell is provided with a rubber sealing ring at the perforation through which the pins pass, and the bottom of the outer shell is provided with an epoxy resin potting layer.

[0015] Furthermore, a top plate is fixedly connected to the top surface of the sealed door panel, and movable rods are connected to the four corners of the bottom surface of the top plate. Movable grooves are opened at the four corners of the top surface of the outer shell, and the movable rods are movably connected to the inside of the movable grooves.

[0016] Furthermore, a strip-shaped groove is provided on the outer side of the outer wall of the outer shell adjacent to the movable groove. An operating rod is slidably connected inside the strip-shaped groove. One end of the operating rod is fixedly connected to the side wall of the movable rod, and the other end of the operating rod extends outside the strip-shaped groove.

[0017] Furthermore, each of the four corners of the top of the outer wall of the outer shell is fixedly connected to a connecting plate. A connecting groove is provided on the top surface of the connecting plate, and a support plate is slidably provided inside the connecting groove. The top surface of the support plate can abut against the bottom surface of the operating rod.

[0018] 3. Beneficial effects:

[0019] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0020] This utility model is reasonably designed. Through the arrangement and cooperation of connector one, connector two, support arm and support spring, it can absorb horizontal vibration energy at vibration frequency. Combined with the setting of piston boss and air damping cavity, piston boss compresses air to generate nonlinear damping force to absorb vertical vibration energy. Under the dual anti-vibration of horizontal and vertical vibration, the vibration amplification phenomenon of transmission linear damping structure can be avoided.

[0021] Through the rigid connection between the SC-cut quartz crystal and the Invar base, the Invar base, with its low coefficient of thermal expansion, provides stable support for the SC-cut quartz crystal, reducing the impact of temperature changes on the SC-cut quartz crystal and ensuring the stability of signal transmission. The flexible connection between the carbon fiber suspension wire and the SC-cut quartz crystal, combined with the rigid support of the Invar base, reduces the vibration amplitude of the SC-cut quartz crystal in all directions, especially suppressing horizontal vibration, thereby reducing phase noise.

[0022] It should be noted that the structures not described in this utility model are the same as or can be implemented using existing technology, and will not be elaborated here, as they do not involve the design points and improvement directions of this utility model. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the sealing door panel in the raised state of this utility model;

[0025] Figure 3 This is a schematic diagram of the disassembled internal components of the inner shell of this utility model;

[0026] Figure 4 This is a schematic diagram of the buffer component structure of this utility model;

[0027] Figure 5 For the present utility model Figure 2 Enlarged structural diagram of section A in the middle.

[0028] Figure label:

[0029] 1. Outer shell; 2. Inner shell; 3. Invar base; 4. SC-cut quartz crystal; 5. Sealing door panel; 6. Carbon fiber suspension line; 7. Buffer assembly; 8. Air damping cavity; 9. Piston boss; 10. Connector 1; 11. Connector 2; 12. Support arm; 13. Support spring; 14. Foot pin; 15. Top plate; 16. Movable rod; 17. Movable groove; 18. Strip groove; 19. Operating rod; 20. Connecting plate; 21. Connecting groove; 22. Support plate. Detailed Implementation

[0030] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," "provided with," and "located in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Example

[0034] See attached document Figure 1-5A low-phase-noise, vibration-resistant crystal oscillator includes a housing 1 and an inner shell 2 on the inner wall of the housing 1. The housing 1 is made of titanium alloy to provide impact resistance, while the inner shell 2 is a ceramic insulating layer that can effectively attenuate external electromagnetic interference. An Invar base 3 is located at the center of the interior of the housing 1, and an SC-cut quartz crystal 4 is located at the top center of the Invar base 3, with the electrode face of the SC-cut quartz crystal 4 facing upwards. The Invar base 3 and the SC-cut quartz crystal 4 are rigidly welded together to avoid low-frequency vibration noise that might be introduced by flexible connections. A movable sealing door panel 5 is located above the outer shell 1. A carbon fiber suspension line 6 is vertically installed at the center of the inner top wall of the sealing door panel 5. The bottom end of the carbon fiber suspension line 6 is connected to the center of the top surface of the sealing door panel 5. Multiple buffer components 7 are provided between the Invar base 3 and the outer shell 1. An air damping cavity 8 is located below the Invar base 3. A piston boss 9 is connected to the center of the bottom surface of the Invar base 3. The piston boss 9 passes through the top of the air damping cavity 8 and maintains a gap with the inner bottom wall of the outer shell 1. A closed cavity is formed between the air damping cavity 8 and the bottom surface of the inner shell 2. The piston boss 9 is inserted into the interior of the air damping cavity 8 and maintains a certain gap with the inner bottom surface of the inner shell 2, forming an air compression damping gap.

[0035] In this embodiment, the buffer assembly 7 includes a first connector 10 and a second connector 11. The first connector 10 is fixed to the side of the Invar base 3 by bolts. The second connector 11 is snapped to the inner side wall of the inner shell 2. A support arm 12 is provided between the first connector 10 and the second connector 11. A support spring 13 is fixedly wound around the outer wall of the support arm 12.

[0036] It should be noted that it can absorb horizontal vibration energy within a certain vibration range.

[0037] In this embodiment, a cross-shaped pressure relief groove is provided on the bottom surface of the Inductance base 3.

[0038] It should be noted that this reduces frequency drift caused by thermal stress.

[0039] In this embodiment, a spiral airflow channel is provided on the surface of the piston boss 9, and a plurality of spiral airflow holes are provided on the side wall of the air damping cavity 8.

[0040] It should be noted that this is used to balance the air pressure inside and outside the cavity and generate a viscous damping effect.

[0041] The bottom of the SC-cut quartz crystal 4 is connected to pins 14 at both ends. The pins 14 pass vertically through the interior of the Invar base 3 and the air damping cavity 8, as well as the bottom of the inner shell 2 and the outer shell 1. The outer shell 1 is provided with a rubber sealing ring at the through hole through which the pins 14 pass, and the bottom of the outer shell 1 is provided with an epoxy resin potting layer.

[0042] It should be noted that the waterproof performance of the interior of the outer casing 1 has been improved.

[0043] In this embodiment, a top plate 15 is fixedly connected to the top surface of the sealing door panel 5. Movable rods 16 are connected to the four corners of the bottom surface of the top plate 15. Movable grooves 17 are formed at the four corners of the top surface of the outer casing 1, and the movable rods 16 are movably connected to the inside of the movable grooves 17. A strip groove 18 is formed on the outer wall of the outer casing 1 adjacent to the movable groove 17. An operating rod 19 is slidably connected inside the strip groove 18. One end of the operating rod 19 is fixedly connected to the side wall of the movable rod 16, and the other end of the operating rod 19 extends outside the strip groove 18. Connecting plates 20 are fixedly connected to the four corners of the top of the outer wall of the outer casing 1. A connecting groove 21 is formed on the top surface of the connecting plate 20, and a support plate 22 is slidably provided inside the connecting groove 21. The top surface of the support plate 22 can abut against the bottom surface of the operating rod 19.

[0044] It should be noted that the operation lever 19 can move up and down along the inside of the strip groove 18 to push the movable lever 16 to move up and down inside the movable groove 17, making it easy to view the inside of the outer casing 1. During use, it can maintain a good sealing state inside the outer casing 1. The operation lever 19 is blocked by the support plate 22, which can prevent the top plate 15 from falling down after it rises, thus playing a role in stabilizing and limiting the position.

[0045] The working principle of this utility model is as follows: In use, the inner shell 2 is first combined with the outer shell 1. The end of the carbon fiber suspension line 6 is anchored by plasma-deposited carbon nanotubes to connect the end to the top surface of the SC-cut quartz crystal 4, forming a flexible suspension. Then, the SC-cut quartz crystal 4 is fixed to the top surface of the Invar base 3 by vacuum electronic welding. The first connector 10 is bolted to the Invar base 3, and the second connector 11 is snapped to the inner shell 2. The pin 14 passes through the interior of the Invar base 3 and the air damping cavity 8, as well as the bottom of the inner shell 2 and the outer shell 1, and is connected to the oscillation circuit.

[0046] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A low-phase-noise, vibration-resistant crystal oscillator, characterized in that: The device includes an outer shell (1), an inner shell (2) on the inner side wall of the outer shell (1), an Inductor base (3) at the center of the inner side of the outer shell (1), an SC-cut quartz crystal (4) at the center of the top of the Inductor base (3), with the electrode surface of the SC-cut quartz crystal (4) facing upwards, a sealing door plate (5) that can move up and down is provided above the outer shell (1), a carbon fiber suspension line (6) is vertically provided at the center of the inner top wall of the sealing door plate (5), the bottom end of the carbon fiber suspension line (6) is connected to the center of the top surface of the sealing door plate (5), a plurality of buffer components (7) are provided between the Inductor base (3) and the outer shell (1), an air damping cavity (8) is provided below the Inductor base (3), a piston boss (9) is connected at the center of the bottom surface of the Inductor base (3), and the piston boss (9) passes through the top of the air damping cavity (8) and leaves a gap with the inner bottom wall of the outer shell (1).

2. The low phase noise anti-vibration crystal oscillator according to claim 1, characterized in that: The buffer assembly (7) includes a first connector (10) and a second connector (11). The first connector (10) is fixed to the side of the Invar base (3) by bolts. The second connector (11) is snapped to the inner wall of the inner shell (2). A support arm (12) is provided between the first connector (10) and the second connector (11). A support spring (13) is fixedly wound around the outer wall of the support arm (12).

3. The low phase noise anti-vibration crystal oscillator according to claim 1, characterized in that: The bottom surface of the Inductor base (3) has a cross-shaped pressure relief groove.

4. The low phase noise anti-vibration crystal oscillator according to claim 1, characterized in that: The piston boss (9) has a spiral airflow channel on its surface.

5. The low phase noise anti-vibration crystal oscillator according to claim 1, characterized in that: The bottom of the SC-cut quartz crystal (4) is connected to pins (14) at both ends. The pins (14) pass vertically through the interior of the Invar base (3) and the air damping cavity (8), as well as the bottom of the inner shell (2) and the outer shell (1). The outer shell (1) is provided with a rubber sealing ring at the perforation through which the pins (14) pass, and the bottom of the outer shell (1) is provided with an epoxy resin potting layer.

6. The low phase noise anti-vibration crystal oscillator according to claim 1, characterized in that: The top surface of the sealing door panel (5) is fixedly connected to a top plate (15), and each of the four corners of the bottom surface of the top plate (15) is connected to a movable rod (16). Each of the four corners of the top surface of the outer shell (1) is provided with a movable groove (17), and the movable rod (16) is movably connected to the movable groove (17).

7. A low phase noise anti-vibration crystal oscillator according to claim 6, characterized in that: A strip groove (18) is provided on the outer side of the outer wall of the outer shell (1) adjacent to the movable groove (17). An operating rod (19) is slidably connected inside the strip groove (18). One end of the operating rod (19) is fixedly connected to the side wall of the movable rod (16), and the other end of the operating rod (19) extends to the outside of the strip groove (18).

8. The low phase noise anti-vibration crystal oscillator according to claim 7, characterized in that: The outer wall of the outer shell (1) is fixedly connected to four corners of the top of the outer wall with connecting plates (20). The top surface of the connecting plate (20) is provided with a connecting groove (21). A support plate (22) is slidably provided inside the connecting groove (21). The top surface of the support plate (22) can abut against the bottom surface of the operating rod (19).

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