SMD quartz crystal resonator whole plate structure

Abstract

The utility model relates to a surface mount device (SMD) quartz crystal resonator integral plate structure, which comprises a ceramic integral plate, the ceramic integral plate comprises a plurality of quartz crystal bases arranged in a matrix, the back surface of each quartz crystal base is provided with an electrode, the front surface of each quartz crystal base is provided with an annular metallization coating, the front surface of each quartz crystal base is provided with a dispensing platform, and the dispensing platform is provided with an annular metallization coating. A dispensing platform is arranged on the quartz crystal base, a quartz wafer is arranged on the dispensing platform, the dispensing platform comprises a dispensing platform A and a dispensing platform B, a metal upper cover is arranged on the front surface of each quartz crystal base, the metal upper covers are connected with the quartz crystal bases in a welding manner, and accommodating cavities are formed in the metal upper covers. Compared with an existing structure that a containing cavity is formed by adopting double-layer ceramic, on the premise that the production efficiency is basically guaranteed, the metallization coating is printed on the single-layer ceramic substrate, the yield is improved, and the material cost is directly reduced.

Description

Technical Field

[0001] This utility model relates to a whole-plate structure of an SMD quartz crystal resonator, belonging to the technical field of resonator structure. Background Technology

[0002] SMD quartz crystal resonators are commonly used electronic devices, and their usage is increasing with the development of digital technology. However, there are currently technical obstacles in improving the processing efficiency and quality of SMD quartz crystal resonators, both in terms of the device structure itself and the manufacturing process.

[0003] There are two types of base structures for SMD quartz crystal resonators. One is a metal encapsulation structure: a Kovar metal ring is sintered on a multi-layer ceramic plate, and then a cover plate is welded in parallel. The disadvantage is that the price is high. The other is a glass glue encapsulation structure: a single-layer ceramic plate is sealed with a metal shell or a ceramic-metal cover using glass glue. The disadvantage is that a small amount of gas evaporates from the glass glue, which affects the product's aging rate.

[0004] The traditional processing steps for a single resonator are as follows: 1. Process the entire ceramic plate according to the manufacturing process of quartz crystal resonator ceramic substrate, and then divide and select it to form a ceramic base for a single SMD quartz crystal resonator; 2. Clean, coat, and fix the wafer in the base to form a single SMD quartz crystal resonator; 3. Process a single metal sheet, cover it on the resonator and seal it to form a single SMD quartz crystal resonator.

[0005] Because traditional SMD quartz crystal resonators are manufactured one crystal at a time, their production efficiency is extremely low. Utility model patent application number 201510746226, entitled "A Novel SMD Quartz Crystal Resonator and Its Whole-Plate Packaging Process," discloses a processing method that uses a whole ceramic plate as a substrate to solve the problem of low production efficiency. The ceramic plate has several matrix-arranged quartz crystal bases, and quartz crystal resonators are placed on each base. Then, they are laser-sealed with the whole plate cover to form a whole-plate quartz crystal resonator. Finally, the whole plate is split into pieces to form individual resonators.

[0006] While this method improves production efficiency, the process is complex, with a high scrap rate and overall high manufacturing cost, because the cavity for holding the quartz crystal is made of ceramic or two ceramic plates, and the ceramic needs to be fired and shaped. Utility Model Content

[0007] To address the shortcomings of the existing technology, this invention provides a single-plate structure for an SMD quartz crystal resonator, which utilizes a metal top cover to form a cavity, thereby avoiding the need for ceramic processing.

[0008] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A whole plate structure for SMD quartz crystal resonator includes a ceramic whole plate, the ceramic whole plate includes a plurality of quartz crystal bases arranged in a matrix, each quartz crystal base has an electrode on its back side and an annular metallized coating on its front side, the front side of the quartz crystal base has a dispensing platform, the dispensing platform has a quartz wafer, the dispensing platform includes dispensing platform A and dispensing platform B, the front side of each quartz crystal base has a metal cover, the metal cover is welded to the quartz crystal base, and the metal cover has a cavity inside.

[0009] The beneficial effects of this invention are: First, by printing a metallized coating on a single-layer ceramic substrate to form a whole ceramic plate structure, the production process directly uses the whole ceramic plate for transfer, eliminating the need for individual transfers on tooling, thus reducing space occupation and increasing production efficiency; Second, by using a metal top cover, there is no need to process cavities on the whole ceramic plate or use a two-layer ceramic plate structure to form cavities. Since the metal top cover is easy to process, the yield rate is improved. This directly reduces material costs and meets the requirements of low cost and miniaturization for quartz crystal resonators.

[0010] Furthermore, the metal cover includes a top cover that protrudes in the middle and a side wall that bends downward. The side wall has an outward bending portion at its edge, and the bending portion is laser-welded to the annular metallized coating.

[0011] The advantages of adopting the above-mentioned further solution are that the metal cover has a simple structure, consistent with the traditional single metal cover, and is easy to process.

[0012] Furthermore, the quartz crystal base is also provided with a support platform for supporting the quartz wafer.

[0013] The beneficial effect of adopting the above-mentioned further solutions is that it makes the quartz wafer more stable.

[0014] Furthermore, the quartz crystal base has four electrodes on its back side, the dispensing platforms A and B are electrically connected to two of the electrodes respectively, and the annular metallized coating is electrically connected to the remaining electrodes.

[0015] Furthermore, the base is provided with metallized through holes, which include a first through hole, a second through hole, a third through hole, and a fourth through hole. The four electrodes are respectively a first electrode, a second electrode, a third electrode, and a fourth electrode. The annular metallized coating is electrically connected to the second electrode and the fourth electrode arranged diagonally through the second through hole and the fourth through hole, respectively.

[0016] The dispensing platform A and dispensing platform B are respectively connected to the third electrode and the first electrode arranged diagonally through the third through hole and the first through hole.

[0017] The advantage of adopting the above-mentioned further solution is that the quartz wafer and the annular metallized coating are connected to the external electrode through the metallized hole.

[0018] Furthermore, a through hole is provided at the intersection of the four adjacent quartz crystal bases, and a crack line is provided on the front side of the ceramic plate. The crack lines are arranged in a matrix and pass through the center of the through hole.

[0019] The advantage of adopting the above-mentioned further scheme is that, after slicing, each quartz crystal base forms a concave arc structure around its perimeter. The slicing lines also facilitate the arrangement of individual resonators after manufacturing.

[0020] Furthermore, the through hole is a metallized hole, and adjacent electrodes on the back of adjacent quartz crystal bases are connected through metal wires and through holes; the back of the ceramic plate is provided with crack lines corresponding to the crack lines on the front, the crack lines are arranged in a matrix and pass through the center of the through hole.

[0021] The beneficial effect of adopting the above-mentioned further solution is that it can ensure that all electrodes on the ceramic plate are in a conductive state before the crack line is provided on the back side. This is beneficial for the ceramic plate to perform one-time electroplating of the annular metallization coating, and the ring is provided with dispensing platforms A and B for wafer dispensing.

[0022] Furthermore, the dispensing platform A is connected to the third through hole via a metal printing line.

[0023] The advantage of adopting the above-mentioned further scheme is that it facilitates connecting the two electrodes of the quartz crystal to opposite corners. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the front structure of the ceramic plate of this utility model;

[0025] Figure 2 This is a schematic diagram of the back structure of the ceramic plate of this utility model;

[0026] Figure 3 This is a schematic diagram of the back structure of the quartz crystal base in this utility model;

[0027] Figure 4 This is a schematic diagram of the front structure of the quartz crystal base in this utility model;

[0028] Figure 5 This is a schematic diagram of the front structure of a portion of the ceramic plate in this utility model;

[0029] Figure 6 This is a schematic diagram of the back structure of a portion of the ceramic plate in this utility model;

[0030] Figure 7This is a schematic diagram of the metal top cover structure in this utility model;

[0031] Figure 8 This is a schematic diagram of the cross-sectional structure of the resonator plate structure of this utility model after it has been cracked.

[0032] Figure 9 This is a schematic diagram of the overall structure of part of the resonator of this utility model;

[0033] Figure 10 This is a schematic diagram of the actual product structure of the ceramic whole plate of this utility model.

[0034] In the attached drawings, the component names represented by each number are listed below: 1. First through hole; 2. Second through hole; 3. Third through hole; 4. Fourth through hole; 5. First electrode; 6. Second electrode; 7. Third electrode; 8. Fourth electrode; 9. Metal wire; 10. Crack line; 11. Support platform; 12. Dispensing platform A; 13. Dispensing platform B; 14. Annular metallized coating; 15. Metal printing line; 16. Through hole; 17. Quartz wafer; 18. Frame;

[0035] 100. Ceramic plate; 200. Metal top cover; 201. Top cover; 202. Side wall; 203. Bending section. Detailed Implementation

[0036] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0037] The technical solution of this utility model is as follows: Figures 1-9 As shown, an SMD quartz crystal resonator board structure includes a ceramic board 100. The ceramic board 100 includes a plurality of quartz crystal bases arranged in a matrix. Each quartz crystal base has an electrode on its back side and an annular metallized coating 14 on its front side. The front side of each quartz crystal base has a dispensing platform, on which a quartz crystal wafer 17 is disposed. The dispensing platform includes dispensing platform A12 and dispensing platform B13. Each quartz crystal base has a metal cover 200 on its front side. The metal cover 200 is welded to the quartz crystal base, and the metal cover 200 has a cavity inside.

[0038] The annular metallized coating 14 is composed of printed tungsten paste.

[0039] The metal cover 200 includes a top cover 201 with a central protrusion and a downwardly bent side wall 202. The side wall 202 has an outwardly bent portion 203 at its edge, and the bent portion 203 is laser-welded to the annular metallized coating 14.

[0040] The quartz crystal base is also provided with a support platform 11 for supporting the quartz wafer 17.

[0041] The quartz crystal base has four electrodes on its back side. The dispensing platform A12 and dispensing platform B13 are electrically connected to two electrodes respectively, and the annular metallized coating 14 is electrically connected to the remaining electrodes.

[0042] The quartz crystal base is provided with metallized through holes, which include a first through hole 1, a second through hole 2, a third through hole 3 and a fourth through hole 4. The four electrodes are a first electrode 5, a second electrode 6, a third electrode 7 and a fourth electrode 8, respectively. The annular metallized coating 14 is electrically connected to the second electrode 6 and the fourth electrode 8, which are arranged diagonally, through the second through hole 2 and the fourth through hole 4, respectively.

[0043] The dispensing platforms A12 and B13 are respectively connected to the third electrode 7 and the first electrode 5, which are arranged diagonally, through the third through hole 3 and the first through hole 1.

[0044] A through hole 16 is provided at the intersection of four adjacent quartz crystal bases. A crack line 10 is provided on the front side of the ceramic plate 100. The crack lines 10 are arranged in a matrix and pass through the center of the through hole 16.

[0045] The through hole 16 is a metallized hole, and the adjacent electrodes on the back of the adjacent quartz crystal base are connected through the metal wire 9 and the through hole 16. The back of the ceramic plate 100 is provided with a crack line 10 corresponding to the crack line 10 on the front. The crack line 10 is arranged in a matrix and passes through the center of the through hole 16.

[0046] The dispensing platform A12 is connected to the third through hole 3 via a metal printing line 15.

[0047] Ceramic slabs of 100mm thickness can be made of materials such as alumina;

[0048] The integral plate structure described in this utility model is an integral plate structure of SMD quartz crystal resonator, which is formed into a single quartz crystal resonator after subsequent plate splitting.

[0049] This utility model also relates to a method for fabricating a whole-plate structure of an SMD quartz crystal resonator, the specific steps of which are as follows:

[0050] S1. Making 100 ceramic slabs:

[0051] S1.1 uses a single-layer ceramic substrate, and punches through holes and through holes 16 on the ceramic substrate. When punching through holes, a first through hole 11, a second through hole 22, a third through hole 33 and a fourth through hole 44 are punched at diagonal positions of each base on the ceramic substrate, wherein the first through hole 11 and the third through hole 33 are at diagonal positions, and the second through hole 22 and the fourth through hole 44 are at diagonal positions.

[0052] S1.2 The through hole 16 is metallized so that a metal coating is attached to its inner wall;

[0053] S1.3 Metallization printing: Metallization printing is performed on the front and back sides of the ceramic substrate, including the printing of the annular metallization coating 14, electrodes, metal layers of dispensing platforms A1212 and B13, and support platform 11. The first metal layer is printed at the positions of the annular metallization coating 14, dispensing platforms A1212 and B13, support platform 11, and four electrodes, so that the electrodes are connected to the dispensing platforms A12 and B13 and the annular metallization coating 14 through through holes and metal printing lines 15.

[0054] After the first metal layer dries, the first metal layer is tungsten metal. Then, a second metal layer is printed on the first metal layer at the positions of dispensing platform A12 and B and support platform 11. The second metal layer is tungsten metal.

[0055] Finally, the metal layer is smoothed.

[0056] S1.4 Slice the plate line 10. Slice the plate line 10 in a matrix arrangement on both the front and back sides of the ceramic plate 100. The slice line 10 passes through the center of the through hole 16. When slicing the plate line 10, two symmetrical slice lines 10 are formed at one time using symmetrical cutters. The depth of the slice line 10 is less than the thickness of the metal coating. After the slice line 10 is formed on the back side, the electrodes on adjacent bases can still be connected by the metal coating and the metal wire 9.

[0057] S1.5 sintered ceramic whole plate 100;

[0058] S1.6 has a nickel and gold layer electroplated on the metal layer.

[0059] When the above-mentioned whole-board SMD quartz crystal resonator substrate structure is used to produce resonators, it also includes: arranging, cleaning, and coating the wafers; placing the coated wafers on each base of the whole-board substrate, applying adhesive, curing, and then cutting the metal lines 9 on each base, i.e. the metal lines 9 between the electrodes and the metal coating; and then cutting the metal lines 9 on each base. The adhesive application platforms A1212 and B13 can be connected through the third through hole 33 and the first through hole 11 respectively, which can be used to etch and fine-tune each resonator on the whole-board substrate.

[0060] S2, Machining the metal top cover 200:

[0061] S2.1 Fabricate a stamping die to stamp the metal strip into a metal cover 200;

[0062] S2.2 Cleaning and barrel plating: Electroplating nickel onto the 200mm surface of the metal cover.

[0063] S3. Laser weld a metal cover 200 onto each of the quartz crystal bases to form the integral plate structure of this utility model.

[0064] Based on this, a single quartz crystal resonator is formed by splitting the plate.

[0065] Figure 10 The diagram shown is a schematic of the actual product structure of the ceramic plate of this utility model. A frame 18 is inlaid on its outer periphery to facilitate the fixing of the substrate in subsequent processes.

[0066] This utility model of quartz crystal resonator uses a metallized coating printed on a single-layer ceramic substrate, followed by printing and baking of the metal coating. This achieves excellent results in terms of conductivity, insulation, and support, while solving the problems of difficult processing and high cost of the original multi-layer substrate. It directly reduces material costs and meets the requirements of low cost and miniaturization of quartz crystal resonators. After its launch, the product can completely replace the current SMD quartz crystal resonator substrate and has broad application prospects.

[0067] 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 single-plate structure for an SMD quartz crystal resonator, characterized in that: The system includes a ceramic plate (100), on which a plurality of quartz crystal bases are arranged in a matrix. Each quartz crystal base has an electrode on its back side and an annular metallized coating (14) on its front side. The front side of each quartz crystal base has a dispensing platform, on which a quartz wafer (17) is disposed. The dispensing platform includes dispensing platform A (12) and dispensing platform B (13). Each quartz crystal base has a metal cover (200) on its front side, which is welded to the quartz crystal base. The metal cover (200) has a cavity inside.

2. The SMD quartz crystal resonator whole-board structure according to claim 1, characterized in that, The metal cover (200) includes a top cover (201) with a central protrusion and a downwardly bent sidewall (202). The sidewall (202) has an outwardly bent portion (203) at its edge, and the bent portion (203) is laser welded to the annular metallized coating (14).

3. The SMD quartz crystal resonator whole-board structure according to claim 1, characterized in that, The quartz crystal base is also provided with a support platform (11) for supporting the quartz wafer (17).

4. The SMD quartz crystal resonator whole-board structure according to claim 1, characterized in that, The quartz crystal base has four electrodes on its back side. The dispensing platform A (12) and dispensing platform B (13) are electrically connected to two electrodes respectively, and the annular metallized coating (14) is electrically connected to the remaining electrodes.

5. The SMD quartz crystal resonator whole-board structure according to claim 4, characterized in that: The quartz crystal base is provided with metallized through holes, which include a first through hole (1), a second through hole (2), a third through hole (3) and a fourth through hole (4). The four electrodes are a first electrode (5), a second electrode (6), a third electrode (7) and a fourth electrode (8). The annular metallized coating (14) is electrically connected to the second electrode (6) and the fourth electrode (8) arranged diagonally through the second through hole (2) and the fourth through hole (4), respectively. The dispensing platform A (12) and dispensing platform B (13) are respectively connected to the third electrode (7) and the first electrode (5) arranged diagonally through the third through hole (3) and the first through hole (1).

6. The SMD quartz crystal resonator plate structure according to any one of claims 1 to 5, characterized in that, A through hole (16) is provided at the intersection of the four adjacent quartz crystal bases. A crack line (10) is provided on the front side of the ceramic plate (100). The crack line (10) is arranged in a matrix and passes through the center of the through hole (16).

7. The SMD quartz crystal resonator whole-board structure according to claim 6, characterized in that, The through hole (16) is a metallized hole, and the adjacent electrodes on the back of the adjacent quartz crystal base are connected by a metal wire (9) and the through hole (16); the back of the ceramic plate (100) is provided with a crack line (10) corresponding to the crack line (10) on the front side, the crack line (10) is arranged in a matrix and passes through the center of the through hole (16).

8. The SMD quartz crystal resonator whole-board structure according to claim 5, characterized in that, The dispensing platform A (12) is connected to the third through hole (3) via a metal printing line (15).

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