High-frequency low-hysteresis temperature sensing quartz crystal resonator

Abstract

The utility model relates to a high frequency low hysteresis temperature induction quartz crystal resonator, comprising a ceramic pedestal and an upper cover, the ceramic pedestal comprises a ceramic block and a ceramic wall which are successively arranged from bottom to top, the upper end face of the ceramic block and the inner wall of the ceramic wall form a cavity in a surrounding manner, the upper end of the cavity is sealed by the upper cover, and the lower end of the cavity is sealed by the lower cover. The middle part of the upper end of the ceramic block is provided with a resistor carrying area which is sunken inwards, the resistor carrying area carries a thermistor, a quartz crystal is arranged above the thermistor in the cavity, the middle parts of the upper end and the lower end of the quartz crystal are respectively provided with an inward sunken area, and the sunken areas are main oscillation areas. Each recessed area is provided with an electrode surface, and the bottom of the ceramic block is provided with external electrodes which are connected with the electrode surfaces and the thermistors in a one-to-one correspondence manner. According to the utility model, the hysteresis capability of the temperature sensing quartz crystal resonator can be improved, the structural strength of the high-frequency quartz crystal is enhanced, and the loss cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of quartz crystal frequency components, in particular to a high-frequency, low-hysteresis, temperature-sensitive quartz crystal resonator. Background Art

[0002] Temperature-sensing quartz crystals typically consist of a piezoelectric quartz chip, a thermistor, conductive adhesive, a base, and a cover. The piezoelectric quartz chip is typically square or round, with a reserved area for the thermistor on the ceramic base. Temperature-sensing quartz crystals are often used in high-precision equipment. When power is applied, the quartz crystal begins to oscillate. Simultaneously, the thermistor senses the ambient temperature changes, converting them into electrical signals and feeding them back to the IC. The IC then uses internal regulation to maintain stable crystal oscillations.

[0003] With the development of the 5G era, the requirements for temperature-sensitive quartz crystals are becoming increasingly stringent, demanding high frequency and low hysteresis capabilities. Due to the thinness of the quartz plates used in high-frequency quartz crystals, the drop resistance of the crystal oscillator is significantly reduced. Furthermore, when used in temperature-sensing resonators, the hysteresis requirements are extremely stringent. Temperature changes significantly affect the crystal's oscillation, causing unstable vibrations during temperature cycle testing, resulting in failures during customer board testing. Therefore, it is necessary to develop more stable high-frequency quartz crystal designs and methods for preparing low-hysteresis temperature-sensing quartz crystal resonators. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a high-frequency, low-hysteresis temperature-sensitive quartz crystal resonator, which can improve the mechanical strength of the high-frequency quartz crystal itself, reduce the impact of temperature changes on crystal oscillation, and at the same time ensure low hysteresis capability.

[0005] The technical solution adopted by the utility model to solve its technical problems is: to provide a high-frequency, low-hysteresis, temperature-sensitive quartz crystal resonator, including a ceramic base and an upper cover, the ceramic base including a ceramic block and a ceramic wall arranged in sequence from bottom to top, the upper end surface of the ceramic block and the inner wall of the ceramic wall surround a chamber, the upper end of the chamber is sealed by the upper cover, the middle part of the upper end of the ceramic block is provided with an inwardly recessed resistor carrying area, the resistor carrying area is equipped with a thermistor, a quartz crystal is installed above the thermistor in the chamber, the middle part of the upper and lower ends of the quartz crystal are both provided with an inwardly recessed area, the recessed area is a main oscillation area, each recessed area is provided with an electrode surface, and the bottom of the ceramic block is provided with an external electrode connected to the electrode surface and the thermistor in a one-to-one correspondence.

[0006] As a supplement to the technical solution described in the present invention, two dispensing PAD blocks are installed in parallel on the left side of the upper end of the ceramic block, and each dispensing PAD block is provided with an internal electrode, namely the front internal electrode one and the rear internal electrode one. The quartz crystal is mounted on the front internal electrode one and the rear internal electrode one. Two internal electrodes are provided in the middle of the resistor mounting area, namely the front internal electrode two and the rear internal electrode two. The thermistor is mounted on the front internal electrode two and the rear internal electrode two. The four corners of the lower end of the ceramic block are respectively provided with a left front external electrode, a left rear external electrode, a right front external electrode and a right rear external electrode. The front internal electrode one is connected to the left front external electrode, the rear internal electrode one is connected to the right rear external electrode, the front internal electrode two is connected to the right front external electrode, and the rear internal electrode two is connected to the left rear external electrode.

[0007] As a supplement to the technical solution described in the present invention, the quartz crystal is mounted on the front internal electrode 1 and the rear internal electrode 1 through conductive glue.

[0008] As a supplement to the technical solution described in the present invention, internal leads are provided inside the ceramic block between the second front internal electrode and the right front external electrode, and between the second front internal electrode and the right front external electrode.

[0009] As a supplement to the technical solution described in the present invention, a pit structure is provided on the dispensing PAD block, and the front internal electrode 1 and the rear internal electrode 1 are respectively arranged in the corresponding pit structures.

[0010] As a supplement to the technical solution described in the present invention, two electrode pins are provided on the side of the quartz crystal, each electrode pin is connected to the corresponding electrode surface through a lead, and the two electrode pins are respectively connected to the front internal electrode 1 and the rear internal electrode 1.

[0011] As a supplement to the technical solution of the present invention, an etching pit is provided at the bottom of the electrode foot, and the shape of the etching pit can be trapezoidal or conical.

[0012] As a supplement to the technical solution described in the present invention, a desiccant receiving groove is opened on the right side of the upper end of the ceramic block, and a desiccant is installed in the desiccant receiving groove, and the desiccant is fixed in the desiccant receiving groove by filling it with non-conductive glue.

[0013] As a supplement to the technical solution described in the present invention, the thermistor is mounted on the resistor mounting area through solder paste.

[0014] Beneficial effects: The utility model relates to a high-frequency, low-hysteresis temperature-sensing quartz crystal resonator, which mounts the thermistor inside the base, so that the thermistor can feedback the temperature inside the cavity more accurately; by optimizing the structural design of the quartz crystal, it is designed into an "H"-shaped structure to improve the drop resistance of the high-frequency quartz crystal itself, and the pit structure design is carried out with the glue dispensing PAD block to improve the glue dispensing ability, and the etched pit design of the electrode foot is used to improve the adhesion ability, increase the buffer layer, reduce the impact of temperature changes on the crystal, enhance the structural stability of the crystal, and greatly improve the hysteresis ability, making it more stable for customers to use and reducing the risk of frequency distortion of the product under high power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the utility model;

[0016] Figure 2 This is a top view of the utility model with the upper cover removed;

[0017] Figure 3 It is a top view of the ceramic base described in the utility model;

[0018] Figure 4 It is a bottom view of the utility model;

[0019] Figure 5 This is a top view of the internal circuitry at the upper end of the ceramic base of the present invention;

[0020] Figure 6 This is a bottom view of the circuit at the bottom of the ceramic base described in the present utility model.

[0021] Diagram: 1. Ceramic block, 11. Right front external electrode, 12. Left rear external electrode, 13. Right rear external electrode, 14. Right front external electrode, 2. Resistor mounting area, 21. Front internal electrode 2, 22. Rear internal electrode 2, 3. Desiccant holding tank, 4. Glue dispensing PAD block, 41. Front internal electrode 1, 42. Rear internal electrode 1, 43. Pit structure, 5. Ceramic wall, 6. Top cover, 7. Quartz crystal, 71. Electrode surface, 72. Etched pit, 73. Electrode foot, 74. Electrode lead, 75. Recessed area, 8. Conductive glue, 9. Thermistor. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art may make various changes or modifications to the present invention, and that such equivalents also fall within the scope of the claims appended hereto.

[0023] The embodiment of the present utility model relates to a high frequency low hysteresis temperature sensing quartz crystal resonator, such as Figure 1-6 As shown, it includes a ceramic base and an upper cover 6. The ceramic base includes a ceramic block 1 and a ceramic wall 5 arranged in sequence from bottom to top. The upper end surface of the ceramic block 1 and the inner wall of the ceramic wall 5 are surrounded by a chamber, and the upper end of the chamber is sealed by the upper cover 6. The middle part of the upper end of the ceramic block 1 is provided with an inwardly recessed resistor mounting area 2, and the resistor mounting area 2 is equipped with a thermistor 9. A quartz crystal 7 is installed above the thermistor 9 in the chamber, and an inward recessed area 75 is provided in the middle of the upper and lower ends of the quartz crystal 7, so that the vertical cross-section of the middle part of the quartz crystal 7 is an "H"-shaped structure. Such a structural design can enhance the drop resistance of the high-frequency quartz crystal itself. The recessed area 75 is the main oscillation area, and each recessed area 75 is provided with an electrode surface 71. The bottom of the ceramic block 1 is provided with an external electrode connected to the electrode surface 71 and the thermistor 9 in a one-to-one correspondence.

[0024] Two dispensing PAD blocks 4 are installed in parallel on the left side of the upper end of the ceramic block 1, and each dispensing PAD block 4 is provided with an internal electrode, namely the front internal electrode 1 41 and the rear internal electrode 1 42. The quartz crystal 7 is mounted on the front internal electrode 1 41 and the rear internal electrode 1 42. Two internal electrodes are provided in the middle of the resistor mounting area 2, namely the front internal electrode 2 21 and the rear internal electrode 2 22. The thermistor 9 is mounted on the front internal electrode 2 21 and the rear internal electrode 2 22. The four corners of the lower end of the ceramic block 1 are respectively provided with a left front external electrode 11, a left rear external electrode 12, a right front external electrode 14 and a right rear external electrode 13. The front internal electrode 1 41 is connected to the left front external electrode 11, the rear internal electrode 1 42 is connected to the right rear external electrode 13, the front internal electrode 2 21 is connected to the right front external electrode 14, and the rear internal electrode 2 22 is connected to the left rear external electrode 12.

[0025] The quartz crystal 7 is mounted on the front internal electrode 1 41 and the rear internal electrode 1 42 through a conductive adhesive 8; internal leads are provided inside the ceramic block 1 between the front internal electrode 2 21 and the right front external electrode 14 and between the front internal electrode 2 21 and the right front external electrode 14.

[0026] The dispensing PAD block 4 is provided with a pit structure 43 , and the front internal electrode 1 41 and the rear internal electrode 1 42 are respectively arranged in the corresponding pit structures 43 .

[0027] Two electrode pins 73 are provided on the side of the quartz crystal 7. Each electrode pin 73 is connected to the corresponding electrode surface 71 through a lead 74. The two electrode pins 73 are respectively connected to the front internal electrode 41 and the rear internal electrode 42.

[0028] An etching pit 72 is provided at the bottom of the electrode foot 73 , and the shape of the etching pit 72 can be trapezoidal or conical.

[0029] A desiccant receiving groove 3 is provided on the right side of the upper end of the ceramic block 1 . A desiccant is installed in the desiccant receiving groove 3 and the desiccant is fixed in the desiccant receiving groove 3 by filling it with non-conductive glue.

[0030] The thermistor 9 is mounted on the resistor mounting area 2 through solder paste.

[0031] A method for manufacturing a high-frequency, low-hysteresis, temperature-sensitive quartz crystal resonator comprises the following steps:

[0032] S1: The production process of ceramic base:

[0033] S1.1: First, prepare ceramic block 1 by weighing and mixing the main raw materials and additive powder materials, pressing them into strips, cutting and separating them, attaching them to the frame, and punching them;

[0034] S1.1: Next, a resistor mounting area 2 is formed in the middle of the upper end of the ceramic block 1.

[0035] S1.2: Again, a desiccant holding tank 3 and a groove for placing the dispensing PAD block 4 are machined on both sides of the upper end of the ceramic block 1;

[0036] S1.3: Separately, in the dispensing PAD block 4, the main raw material and additive powder materials are weighed and mixed, and then pressed into shape;

[0037] S1.4: Finally, place the ceramic wall 5 and the dispensing pad block 4 in the corresponding position of the ceramic block 1, sinter them, plate them with Ni, install the sealing ring, sinter them again, plate them with gold, and cut them into individual bases;

[0038] S2: Production process of quartz crystal 7:

[0039] S2.1: First, a film is deposited on quartz crystal 7, photoresist is applied, a mask is exposed, the photoresist is removed, and the quartz is etched. Inwardly directed recessed regions 75 are machined in the middle of the upper and lower ends of quartz crystal 7, so that the vertical cross-section of the middle portion of quartz crystal 7 has an "H"-shaped structure.

[0040] S2.2: Then, based on the quartz crystal 7 wafer forming, it is cut into single quartz crystals, and then etched, cleaned, dried, screened, and packaged;

[0041] S3: Production process of temperature-sensing quartz crystal resonator:

[0042] S3.1: Mounting the resistor: Apply solder paste to two points on the resistor mounting area using tin spraying. Attach thermistor 9 to the two electrodes. Place thermistor 9 inside the cavity, allowing thermistor 9 to provide more accurate feedback on the cavity's internal temperature.

[0043] S3.2: Desiccant placement: Mix the desiccant with the colloid and place it in the desiccant holding tank 3 by spraying the glue to reduce the risk of wetting inside the cavity caused by the thermal process during subsequent processing;

[0044] S3.3: Coating. Coating is performed by sputtering, where high-energy particles collide with the surface of the metal target. Atoms on the metal surface exchange momentum with these high-energy particles, are ejected from the surface, and are transferred to the surface of the quartz crystal through the action of an electric field to form a metal film. During sputtering, the quartz crystal is installed in an electrode mask, which determines the shape and size of the electrode surface 71, electrode pins 73, and leads 74 of the metal film.

[0045] S3.4: Glue dispensing. The inner cavity of the base is provided with an internal electrode. The quartz crystal 7 is adhered to the internal electrode of the base using conductive glue 8. The glue dispensing pad block 4 is provided with a pit structure 43. The pit structure 43 effectively reduces the colloid overflow caused by the glue being too large or too high. It also increases the mounting height of the quartz crystal 7, reducing the crystal's heat loss and vibration power consumption. At the same time, the electrode foot 73 is designed with an etched pit 72, which can better ensure the structural stability of the quartz crystal 10 and improve its resistance to heat loss.

[0046] S3.5: Fine-tuning. Fine-tuning is done by dry etching, where an ion beam bombards the surface of the metal film, reducing the number of metal atoms on the surface to adjust the frequency of the quartz crystal to the target range.

[0047] S3.6: Welding and sealing. Welding and sealing is to seal the ceramic base and the upper cover 6 so that the quartz crystal 7 is in a vacuum sealed cavity. This can prevent the metal film from being oxidized and reduce the resistance of the quartz vibrator, thereby ensuring the long-term frequency stability of the product.

[0048] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0049] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0050] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0051] The above is a detailed introduction to a high-frequency, low-hysteresis, temperature-sensing quartz crystal resonator provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A high-frequency, low-hysteresis, temperature-sensitive quartz crystal resonator, comprising a ceramic base and an upper cover (6), characterized in that: The ceramic base comprises a ceramic block (1) and a ceramic wall (5) arranged in sequence from bottom to top, the upper end surface of the ceramic block (1) and the inner wall of the ceramic wall (5) are surrounded to form a chamber, the upper end of the chamber is sealed by an upper cover (6), the middle part of the upper end of the ceramic block (1) is provided with an inwardly recessed resistor carrying area (2), the resistor carrying area (2) is equipped with a thermistor (9), a quartz crystal (7) is installed above the thermistor (9) in the chamber, the middle part of the upper and lower ends of the quartz crystal (7) are provided with an inwardly recessed area (75), the recessed area (75) is a main oscillation area, each recessed area (75) is provided with an electrode surface (71), and the bottom of the ceramic block (1) is provided with an external electrode connected to the electrode surface (71) and the thermistor (9) in a one-to-one correspondence.

2. The high-frequency, low-hysteresis, temperature-sensitive quartz crystal resonator according to claim 1, characterized in that: Two dispensing PAD blocks (4) are installed in parallel on the left side of the upper end of the ceramic block (1), and each dispensing PAD block (4) is provided with an internal electrode, namely, a front internal electrode one (41) and a rear internal electrode one (42). The quartz crystal (7) is mounted on the front internal electrode one (41) and the rear internal electrode one (42). Two internal electrodes are provided in the middle of the resistor mounting area (2), namely, a front internal electrode two (21) and a rear internal electrode two (22). The thermistor (9) is mounted on the front internal electrode two (21). and the rear internal electrode 2 (22), the four corners of the lower end of the ceramic block (1) are respectively provided with a left front external electrode (11), a left rear external electrode (12), a right front external electrode (14) and a right rear external electrode (13), the front internal electrode 1 (41) is connected to the left front external electrode (11), the rear internal electrode 1 (42) is connected to the right rear external electrode (13), the front internal electrode 2 (21) is connected to the right front external electrode (14), and the rear internal electrode 2 (22) is connected to the left rear external electrode (12).

3. The high-frequency, low-hysteresis, temperature-sensitive quartz crystal resonator according to claim 2, characterized in that: The quartz crystal (7) is mounted on the front internal electrode (41) and the rear internal electrode (42) via a conductive adhesive (8).

4. The high-frequency, low-hysteresis, temperature-sensitive quartz crystal resonator according to claim 2, characterized in that: Internal leads are provided inside the ceramic block (1) between the second front internal electrode (21) and the right front external electrode (14), and between the second front internal electrode (21) and the right front external electrode (14).

5. The high-frequency, low-hysteresis, temperature-sensitive quartz crystal resonator according to claim 2, characterized in that: The dispensing PAD block (4) is provided with a pit structure (43), and the front internal electrode 1 (41) and the rear internal electrode 1 (42) are respectively arranged in the corresponding pit structures (43).

6. The high-frequency, low-hysteresis, temperature-sensitive quartz crystal resonator according to claim 1, characterized in that: Two electrode pins (73) are provided on the side of the quartz crystal (7), each electrode pin (73) is connected to the corresponding electrode surface (71) through a lead (74), and the two electrode pins (73) are respectively connected to the front internal electrode 1 (41) and the rear internal electrode 1 (42).

7. The high-frequency, low-hysteresis, temperature-sensitive quartz crystal resonator according to claim 6, characterized in that: An etching pit (72) is provided at the bottom of the electrode foot (73), and the shape of the etching pit (72) is trapezoidal or conical.

8. The high-frequency, low-hysteresis, temperature-sensitive quartz crystal resonator according to claim 1, characterized in that: A desiccant receiving groove (3) is provided on the right side of the upper end of the ceramic block (1). Desiccant is installed in the desiccant receiving groove (3), and the desiccant is fixed in the desiccant receiving groove (3) by filling non-conductive glue.

9. The high-frequency, low-hysteresis, temperature-sensitive quartz crystal resonator according to claim 1, characterized in that: The thermistor (9) is mounted on the resistor mounting area (2) via solder paste.

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