Temperature compensation crystal resonator with double-roller and double-R flat and inverted design

Abstract

The utility model discloses a temperature compensation crystal resonator with a double-roller and double-R flat and inverted design, which comprises a base, the surface of the base is fixed with a spring piece through spot welding, a shell is fixedly arranged on the base through a buckle, a wafer is arranged in the shell, the wafer and an electrode coated on the wafer form an oscillator, and the oscillator is connected with the base. The end part of the wafer is connected with the spring piece through a conductive adhesive; a first pin and a second pin are respectively mounted at the bottom of the base; the wafer comprises an R1 roller plane, and the R1 roller plane is arranged on the outer side of the R2 roller plane. According to the temperature compensation crystal resonator with the double-roller double-R flat inverted design, by adopting the unique appearance design of double-roller double-R flat inverted edges, the smoothness and high-temperature overturning points can be effectively improved, the smoothness index is averagely between 0.08 ppm and 0.28 ppm, the high-temperature overturning points are small in scattering difference and good in consistency, the percent of pass is greater than 85%, materials are saved, and the percent of pass and the utilization rate of products on a machine are improved.

Description

Technical Field

[0001] This utility model relates to the field of crystal resonators, specifically a temperature-compensated crystal resonator with a double-roller, double-R flat-inverted design. Background Technology

[0002] The existing crystal resonator, taking the UM-1 type 7.168MHz as an example, has a crystal diameter of φ5.5. The single platform basically adopts the resistance welding structure of the roller flat chamfering technology. Its combined structure mainly includes the oscillator, spring plate and base; the oscillator is formed by vacuum coating metal electrodes onto the crystal with a certain geometric size and angle.

[0003] The roller flat beveling technique, which is widely used in the crystal industry, has the following drawbacks:

[0004] The excitation level correlation is poor, averaging between 1.8Ω and 3Ω; the smoothness index has large dispersion and is not easy to control, averaging around 0.2ppm to 0.6ppm (-40℃ to 75℃); the inflection point temperature variation is large, and the temperature resistance variation is also large, approximately 2.5Ω to 9.0Ω; the overall pass rate is extremely low, around 20%, failing to meet the requirements of specific products such as smoothness ≤ ±0.30ppm, temperature resistance variation ≤ 2Ω, and high temperature inversion point range of 56℃ to 64℃; in order to meet the requirements, a new type of temperature-compensated crystal resonator with a double roller double R flat-inverting design is provided. Utility Model Content

[0005] The purpose of this invention is to provide a temperature-compensated crystal resonator with a double-roller, double-R flat-inverted design to solve the defects mentioned in the background art.

[0006] To achieve the above objectives, a temperature-compensated crystal resonator with a double-roller, double-R flat-top design is provided, comprising a base, the surface of which is fixed to a spring sheet by spot welding, and a housing is fixedly mounted on the base by a snap fastener. Meanwhile, a crystal is disposed inside the housing, and the crystal and electrodes coated on the crystal form an oscillator. The end of the crystal is connected to the spring sheet by conductive adhesive. A first pin and a second pin are respectively mounted on the bottom of the base.

[0007] The wafer includes an R1 roller plane, which is located outside the R2 roller plane. Meanwhile, an annular transition ramp section with a φ3 arc surface is provided on the R2 roller plane. An φ1 plane is provided inside the φ3 arc surface of the annular transition ramp section, and an edge φ2 arc surface is provided outside the φ3 arc surface of the annular transition ramp section.

[0008] Preferably, two sets of spring plates are symmetrically mounted on the surface of the base, and the spring plates are "S"-shaped structures made of metal, while the wafer is clamped between the two sets of spring plates.

[0009] Preferably, the bottoms of the two sets of spring plates are electrically connected to the first pin and the second pin, respectively, and the first pin and the second pin are arranged in parallel.

[0010] Preferably, the size of the R1 roller plane is 40mm, and the size of the R2 roller plane is 50mm.

[0011] Preferably, the φ1 plane is located at the middle position of the wafer surface, and the φ1 plane and the edge φ2 arc surface are transitioned by an annular transition slope section with a layer of φ3 arc surface.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. Low excitation level correlation and good consistency; The temperature-compensated crystal resonator with double roller double R flat-inverted design is different from the previous temperature-compensated crystal resonator with single roller flat-inverted edge design. Through the unique shape design of double R double roller edge, the excitation level correlation can be effectively reduced, so that the excitation level correlation index is ≤1Ω, ensuring product quality and improving the long-term stability of the product.

[0014] 2. By adopting a unique double-roller double-R-plane chamfering design, the smoothness and high-temperature turning point can be effectively improved, so that the smoothness index is on average between 0.08ppm and 0.28ppm, the high-temperature turning point has small dispersion and good consistency, the pass rate is greater than 85%, saving materials and improving the product pass rate and machine utilization rate.

[0015] 3. Small temperature resistance variation; The temperature-compensated crystal resonator with double roller double R-plane chamfered edge design is different from the previous temperature-compensated crystal resonator with roller plane chamfered edge design. By adopting the unique shape design of double roller double R-plane chamfered edge, it can effectively improve the temperature resistance variation index of the product, with a temperature resistance variation ≤2Ω, a pass rate of more than 75%, saving materials and improving production efficiency.

[0016] 4. Good frequency stability; The temperature-compensated crystal resonator with double roller and double R flat-edge design is different from the previous temperature-compensated crystal resonator with single roller and flat edge design. The zinc selenide copper spring plate support structure has better vibration resistance than the zinc white copper spring plate support structure.

[0017] 5. Technology Promotion: The unique double-roller, double-R flat-tilting design of this device can cover similar products of 4MHz to 15MHz plug-in crystal resonators, as well as similar products of 8MHz to 40MHz small-size surface-mount crystal resonators. It has a very good reference value in terms of technical parameters, and can effectively meet the demand for high product electrical performance indicators, improve product production efficiency and utilization. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a chip in the prior art;

[0019] Figure 2 This is a front view schematic diagram of the structure of this utility model;

[0020] Figure 3 The structure of this utility model Figure 2 Schematic diagram of exposed wafer in the middle section;

[0021] Figure 4 This is a schematic diagram of the structure of the present invention.

[0022] The following are the labels in the diagram: 1. Base; 2. Conductive adhesive; 3. Wafer; 31. R1 roller plane; 32. R2 roller plane; 33. Edge φ2 arc surface; 34. φ1 plane; 35. Annular transition ramp section with layered φ3 arc surface; 4. Oscillator; 5. Housing; 6. First pin; 61. Second pin; 7. Spring sheet. Detailed Implementation

[0023] Please see Figure 1-4 This utility model provides a temperature compensated crystal resonator with a double roller double R flat-top design, including a base 1. The surface of the base 1 is fixed to a spring sheet 7 by spot welding, and a housing 5 is fixedly installed on the base 1 by a snap fastener. Meanwhile, a crystal 3 is arranged inside the housing 5, and the crystal 3 and the electrodes coated on the crystal 3 form an oscillator 4. The end of the crystal 3 is connected to the spring sheet 7 by conductive adhesive 2. A first pin 6 and a second pin 61 are respectively installed on the bottom of the base 1.

[0024] The wafer 3 includes an R1 roller plane 31, which is located outside the R2 roller plane 32. Meanwhile, an annular transition ramp section with a φ3 arc surface 35 is provided on the R2 roller plane 32. An φ1 plane 34 is provided inside the annular transition ramp section with a φ3 arc surface 35, and an edge φ2 arc surface 33 is provided outside the annular transition ramp section with a φ3 arc surface 35.

[0025] Working principle: The new design of double roller double R1 and R2 edge beveling is adopted to change the edge thickness of wafer 3 and the surface and edge shape of wafer 3. Different sizes of R1 and R2 are used for edge beveling. First, the small R1 roller plane is used for edge beveling. When the frequency is close to the exit frequency, the large R2 roller plane is used for edge beveling to the exit frequency.

[0026] The advanced design of double roller double R flat beveling; the double roller double R flat beveling design changes the surface, edge thickness and shape of the wafer 3, highlighting the annular transition slope layer φ3 arc surface 35 between the edge φ2 arc surface 33 and φ1 plane 34 of the wafer 3. This annular plane wave segment layer φ3 can completely and effectively suppress parasitic frequencies and non-harmonic frequencies, realize single frequency output, and obtain the best effects such as low excitation level correlation, low smoothness, small temperature resistance change and small adjacent resistance change, resulting in a very good crystal temperature characteristic curve.

[0027] In a preferred embodiment, two sets of spring plates 7 are symmetrically mounted on the surface of the base 1, and the spring plates 7 are made of metal in an "S" shape, while the wafer 3 is clamped between the two sets of spring plates 7.

[0028] In a preferred embodiment, the bottoms of the two sets of spring plates 7 are electrically connected to the first pin 6 and the second pin 61, respectively, and the first pin 6 and the second pin 61 are arranged in parallel.

[0029] In a preferred embodiment, the size of the R1 roller plane 31 is 40mm, and the size of the R2 roller plane 32 is 50mm.

[0030] In a preferred embodiment, the φ1 plane 34 is disposed at the middle position of the surface of the wafer 3, and the φ1 plane 34 and the edge φ2 arc surface 33 are transitioned by the annular transition slope section layer φ3 arc surface 35.

[0031] The wafer 3 has an annular arc-shaped wave segment layer φ3 at its edge. This segment layer is formed by double roller plane beveling, a unique and novel design.

[0032] The upper and lower surfaces of wafer 3 are symmetrically provided with planes φ1 of diameter φ1 at their midpoints, and the edges of wafer 3 are provided with arc surfaces φ2 of radius R1.

[0033] Between the edge φ2 arc surface 33 and φ1 plane 34, there is an annular transition slope section with a layer φ3 arc surface 35. The cross-sectional profile of the annular transition slope section with a layer φ3 arc surface 35 is an annular arc surface, and its roller radius is R2, R1 < R2.

[0034] The electrode is located on the plane of wafer 3. The central plane of wafer 3 and the annular transition slope section form a transitional propagation path for vibration energy, so that the vibration energy is completely cut off at the R2 annular arc section layer. The φ1 plane of wafer 3 is the region with the strongest energy trapping wave amplitude. The annular arc transition slope section is the vibration wave nodal surface. The energy wave decays exponentially from the inside to the outside at the annular transition slope section layer until it is cut off at the R2 annular section layer between the φ3 arc surface and φ2.

[0035] The difference between R1 and R2 is 10mm;

[0036] R1 is 40mm;

[0037] R2 is 50mm;

[0038] The temperature-compensated crystal resonator with double roller and double R flat-inverted design has a center plane diameter of Φ1, a diameter of Φ, and a center thickness of t.

[0039] Φ1 / t=(Φ-Φ2-Φ3) / t=9.1733~9.3867;

[0040] Φ2 / t=(Φ-Φ1-Φ3) / t=2.6453;

[0041] Φ3 / t=(Φ-Φ1-Φ2) / t=11.3920~11.4347;

[0042] Outside this range, the parasitic frequency and non-harmonic frequency cannot be completely and effectively suppressed, and a single frequency output cannot be achieved, let alone the design effect.

[0043] The values ​​of Φ1, Φ2, and Φ3 mentioned above can be obtained by controlling the frequency to achieve the desired shape, or by directly measuring the shape of the chip 3 using a projector.

[0044] It has the following advantages: 1. Low excitation level correlation and good consistency; The temperature compensated crystal resonator with double roller double R flat-inverted design is different from the previous temperature compensated crystal resonator with single roller flat-inverted edge design. Through the unique shape design of double R double roller edge, it can effectively reduce the excitation level correlation, so that the excitation level correlation index is ≤1Ω, ensuring product quality and improving the long-term stability of the product.

[0045] 2. Low smoothness and good consistency of high-temperature flip point: This temperature-compensated crystal resonator with double roller double R flat-edge design is different from the previous temperature-compensated crystal resonator with single roller flat edge design. By adopting the unique shape design of double roller double R flat edge, it can effectively improve smoothness and high-temperature flip point, so that the smoothness index is averaged between 0.08ppm and 0.28ppm, the high-temperature flip point dispersion is small and the consistency is good, the pass rate is greater than 85%, saving materials and improving the product pass rate and machine utilization rate.

[0046] 3. Small temperature resistance variation; The temperature-compensated crystal resonator with double roller double R-plane chamfered edge design is different from the previous temperature-compensated crystal resonator with roller plane chamfered edge design. By adopting the unique shape design of double roller double R-plane chamfered edge, it can effectively improve the temperature resistance variation index of the product, with a temperature resistance variation ≤2Ω, a pass rate of more than 75%, saving materials and improving production efficiency.

[0047] 4. Good frequency stability; This temperature-compensated crystal resonator with double roller and double R flat-edge design is different from the previous temperature-compensated crystal resonator with single roller and flat edge design. The zinc selenium copper spring plate 7 bracket structure has better vibration resistance than the zinc white copper spring plate bracket structure.

[0048] 5. Technology Promotion: The unique double-roller, double-R flat-tilting design of this device can cover similar products of 4MHz to 15MHz plug-in crystal resonators, as well as similar products of 8MHz to 40MHz small-size surface-mount crystal resonators. It has a very good reference value in terms of technical parameters, and can effectively meet the demand for high product electrical performance indicators, improve product production efficiency and utilization.

Claims

1. A temperature-compensated crystal resonator with a double-roller, double-R flat-top design, comprising a base (1), characterized in that: The surface of the base (1) is fixed to the spring sheet (7) by spot welding, and the outer shell (5) is fixedly installed on the base (1) by a snap fastener. At the same time, the inner shell (5) is provided with a chip (3), and the chip (3) and the electrodes coated on the chip (3) form an oscillator (4). The end of the chip (3) is connected to the spring sheet (7) by conductive adhesive (2); the bottom of the base (1) is respectively equipped with a first pin (6) and a second pin (61); The wafer (3) includes an R1 roller plane (31) and the R1 roller plane (31) is located outside the R2 roller plane (32). Meanwhile, an annular transition slope section layer φ3 arc surface (35) is provided on the R2 roller plane (32). An φ1 plane (34) is provided inside the annular transition slope section layer φ3 arc surface (35), and an edge φ2 arc surface (33) is provided outside the annular transition slope section layer φ3 arc surface (35).

2. The temperature-compensated crystal resonator with a double-roller, double-R flat-top design according to claim 1, characterized in that: Two sets of spring plates (7) are symmetrically installed on the surface of the base (1), and the spring plates (7) are made of metal in an "S" shape. Meanwhile, the wafer (3) is sandwiched between the two sets of spring plates (7).

3. The temperature-compensated crystal resonator with a double-roller, double-R flat-top design according to claim 2, characterized in that: The bottoms of the two sets of spring plates (7) are electrically connected to the first pin (6) and the second pin (61) respectively, and the first pin (6) and the second pin (61) are arranged in parallel.

4. The temperature-compensated crystal resonator with a double-roller, double-R flat-top design according to claim 1, characterized in that: The size of the R1 roller plane (31) is 40mm, and the size of the R2 roller plane (32) is 50mm.

5. A temperature-compensated crystal resonator with a double-roller, double-R flat-inverted design according to claim 1, characterized in that: The φ1 plane (34) is located at the middle position of the surface of the wafer (3), and the φ1 plane (34) and the edge φ2 arc surface (33) are transitioned by the annular transition slope section layer φ3 arc surface (35).

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