A ring-shaped ceramic capacitor with a hole in the center

Abstract

The invention describes a centrally perforated ring-shaped ceramic capacitor belonging to the technical field of sensors. It is formed by the combined sintering of a ceramic base (1) and a ceramic reaction membrane (2). A hole (3) is provided in the axis of the ceramic base (1) and the ceramic reaction membrane (2) to provide an assembly passage for the circuit components to be assembled, allowing the ring-shaped capacitor to be more easily integrated into the complex circuit of the temperature and pressure sensor. This simplifies its overall circuit and sealing structure and enables automated assembly, reducing production costs. Compared to a discoidal ceramic capacitor without a central hole, its first and second ring circuits (11) and (21) offer a higher initial value and a wider variation, resulting in a broader measurement range, finer pressure detection gradation, and improved measurement accuracy.(Figure for the abbreviation: Fig.1).

Description

Title of the invention: A perforated ring-shaped ceramic capacitor. Technical field

[0001] The present invention relates to the technical field of sensors, and more particularly to a ring-shaped ceramic capacitor with a central perforation. Prior art

[0002] The structure of a temperature and pressure sensor is as follows: along its axis, there is successively a temperature sensing section, a pressure sensing section, and a control and processing section. To avoid interfering with the simultaneous detection of pressure and temperature, it is necessary to introduce the liquid to be detected into the reaction membrane of the pressure sensing section, so that the liquid pressure can be detected by the slight deformation of the reaction membrane, while not affecting the temperature detection of the liquid by the temperature sensing section. Thus, the pressure and temperature sensing pathways are separated.

[0003] The ceramic capacitors in the current pressure sensing section are either hermetically sealed round ceramic capacitor pressure sensors or square ceramic capacitor pressure sensors. This requires the temperature sensing section circuit to bypass the pressure sensing section to connect to the control and processing section located above, thus increasing the complexity of the sensor structure.

[0004] Currently, as in patented invention CN108414030B, to avoid increasing the volume of the temperature and pressure sensor and to prevent affecting the performance of the ceramic capacitor, holes are drilled around the perimeter of the eccentric capacitor to guide the wires from the temperature sensor section to the control and processing section. However, since the guide wires are flexible, this design does not allow for automatic assembly of the temperature and pressure sensor, but only manual assembly. This increases manufacturing costs and reduces production yield compared to automatic assembly; at the same time, the quality stability of manually assembled products is lower than that of automatically assembled products.Therefore, it is urgent to have a temperature and pressure sensor structure that allows for convenient automated assembly and that can also improve pressure measurement performance to some extent.

[0005] However, the ideal processing solution would be to drill a hole in the center of the ceramic capacitor, so that the temperature sensor wires could pass directly through the center of the ceramic capacitor to reach the control and processing section, instead of being guided along the side. Such a structure would simplify the design of the temperature and pressure sensor and make it compatible with automated assembly; however, with the current design of ceramic capacitors, it is impossible to drill a hole in the center without affecting the pressure sensing performance of the ceramic capacitor.

[0006] In summary, it can be seen that the current state of the art presents at least the following technical problem:

[0007] the structure of current ceramic capacitors does not allow automated assembly of the temperature and pressure sensor. Description of the invention

[0008] The object of the present invention is to provide a ring-shaped ceramic capacitor with a hole in the center, which makes it possible to solve the problem of the lack of compatibility of the automated assembly of the temperature and pressure sensor due to the structure of current ceramic capacitors, without affecting the pressure sensing performance of the ceramic capacitor in the temperature and pressure sensor.

[0009] The numerous technical effects produced by the preferred embodiment among the numerous embodiments of the present invention will be described in detail below.

[0010] To solve the above technical problems, the present invention proposes the following technical solutions:

[0011] The present invention provides a centrally perforated ring-shaped ceramic capacitor comprising a ceramic base and a ceramic reaction membrane. A hole is provided in the axis of the ceramic base and the ceramic reaction membrane to provide an assembly passage for the circuit components to be assembled; a first ring circuit is printed on one face of the ceramic base; the first ring circuit is arranged around the hole, a first insulation zone is provided between the inner hole of the first ring circuit and the hole, and a second insulation zone is provided between the outer periphery of the first ring circuit and the outer edge of the ceramic base; the other face of the ceramic base is provided with several pins, which pass through the face to reach the face on which the first ring circuit is printed;the output conductor of the first ring circuit is disposed in the second insulation zone and is electrically connected to the pin; a second ring circuit is printed on one face of the ceramic reaction membrane; the ceramic reaction membrane is combined with the first ring circuit; The ceramic base is connected by placing the second annular circuit opposite the first. The output conductor of the second annular circuit of the ceramic reaction membrane is electrically connected to one of the pins of the ceramic base; the other face of the ceramic reaction membrane is designed to receive the impact of the medium to be measured, in order to undergo deformation due to pressure; an insulating layer is applied to the surface of the first annular circuit; the first and second insulation zones are coated with an insulating adhesive; the insulating layer and the insulating adhesive serve to separate the ceramic reaction membrane from the ceramic base; the ceramic reaction membrane and the ceramic base are combined and sintered to form an annular capacitor; the capacitance of the annular capacitor is between 10 and 80 pf.

[0012] In one embodiment, the diameter of the hole does not exceed 3.5 mm.

[0013] In one embodiment, the error of coincidence between the axis of the hole, the axis of the ceramic base and the axis of the ceramic reaction membrane does not exceed 3 mm.

[0014] In one embodiment, the thickness of the ceramic reaction membrane is between 0.2 and 1.2 mm.

[0015] In one embodiment, when the ceramic reaction membrane is subjected to pressure, the variation in capacitance of the ring capacitor is between 1 and 30 pf.

[0016] In one embodiment, the insulating adhesive material contains 60 to 80% glass powder.

[0017] In one embodiment, the insulation layer material contains 70 to 90% glass powder.

[0018] In one embodiment, the printing material of the first and second ring circuit is gold.

[0019] In one embodiment, the first annular circuit is composed of two annular electrodes, namely a first annular electrode and a second annular electrode; the second annular electrode is arranged around the first annular electrode, and the first annular electrode is close to the first insulation zone; a space is left between the first and second annular electrodes.

[0020] In one embodiment, the second annular circuit is composed of an annular electrode, namely a third annular electrode; the third annular electrode covers the first and second annular electrodes.

[0021] The advantages of the present invention are as follows:

[0022] The centrally perforated annular ceramic capacitor designed by the present invention offers improvements over existing discoidal ceramic capacitors: 1. By designing holes in the axis of the ceramic base and the ceramic reaction membrane, when the perforated annular ceramic capacitor In a combined sensor, such as a temperature and pressure sensor, a centrally located perforated ring ceramic capacitor provides an assembly passage. This allows the wires of the temperature sensor, which must be installed before the centrally located perforated ring ceramic capacitor, to pass through. This facilitates the integration of the centrally located perforated ring ceramic capacitor into the existing complex circuit of the temperature and pressure sensor, simplifies the overall structure of the temperature and pressure sensor, including the circuit and sealing structure, and improves the assembly efficiency of the circuit for the centrally located perforated ring ceramic capacitor, the temperature sensor, and the control and processing components. It simplifies assembly procedures, enables automated assembly, directly improves assembly efficiency, and reduces assembly costs.

[0023] 2. The pressure surface of the reaction membrane of the ceramic capacitor A discoidal pressure surface without a central hole is circular in shape. Compared to an annular pressure surface, the axial stress on a circular pressure surface is greater. During deformation under pressure, the distance from the center to the circumference of the circular pressure surface is longer, the lever arm is longer, and the deformation of the central area of ​​the circular pressure surface is greater than that of the periphery. After repeated intense pressure shocks, the reaction membrane is likely to fail, which accelerates aging and cracking.

[0024] In contrast, the ceramic base and the ceramic reaction membrane of the ring-shaped ceramic capacitor with a central perforation have an annular structure, and the electrodes printed on their surface also have an annular structure. When subjected to pressure, the pressure surface of the ceramic reaction membrane also has an annular shape. The initial value of the ring capacitor is designed to be relatively large. The ceramic reaction membrane under pressure requires only a slight change in shape to produce a large change in the capacitance of the ring capacitor. The deformation of the ceramic reaction membrane is relatively small, which extends the membrane's service life and gives the pressure sensor equipped with the ring-shaped ceramic capacitor improved stability and reliability.

[0025] 3. The ring-shaped ceramic capacitor with a hole in the center has an initial value of It has a higher capacitance and capacitance variation than a discoidal ceramic capacitor without a hole in the center. This gives it a wider measurement range and finer measurement graduation, meaning it can detect a larger pressure range and finer pressure detection levels, thus improving the pressure measurement accuracy of the temperature and pressure sensor equipped with the ring-shaped ceramic capacitor with a hole in the center. Brief description of the drawings

[0026] To illustrate more clearly the technical solutions of the present invention, the drawings necessary for the embodiments will be briefly presented below. It is evident that the drawings described below represent only certain embodiments of the present invention. For a technician in the field, other figures can be obtained from these figures without additional creative effort.

[0027] Fig. 1 is a perspective view of the annular capacitor of the present invention;

[0028] Fig. 2 is a bottom view of the ceramic base of the present invention;

[0029] Figure 3 is a top view of the ceramic reaction membrane of the present invention;

[0030] Fig. 4 is a cross-sectional view of the annular capacitor of the present invention;

[0031] The reference points in the illustrations are as follows:

[0032] 1. Ceramic base; 11. First annular circuit; 111. First electrode 112. Annular electrode; 12. Second annular electrode; 13. First insulation zone; 14. Second insulation zone; 15. Pins; 16. Insulation layer; 17. Insulating adhesive;

[0033] 2. Ceramic reaction membrane; 21. Second annular circuit; 211. Third annular electrode;

[0034] 3. Hole;

[0035] 4. Output conductors. Detailed description of the implementation methods

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the illustrations of the embodiments of the present invention.

[0037] The specific embodiment proposes a ring-shaped ceramic capacitor with a central perforation, formed by combining and sintering a ceramic base and a ceramic reaction membrane to create a ring-shaped capacitor. A hole is provided in the axis of the ceramic base and the ceramic reaction membrane to allow for assembly of the circuit components. This allows the ring-shaped capacitor to be more easily integrated into the complex circuit of the temperature and pressure sensor, simplifies the overall structure of the temperature and pressure sensor, including the circuit and sealing structure, thus giving the temperature and pressure sensor a structure compatible with automated assembly and reducing production and assembly costs.It effectively solves the problem that the structure of existing ceramic capacitors does not allow for the automatic assembly of the temperature and pressure sensor. The first annular circuit and the second annular circuit are designed for the capacitor. Annular capacitors have a higher initial capacitance value and a wider capacitance variation than discoidal ceramic capacitors without a hole in the center, giving the annular capacitor a wider measurement range and finer pressure detection graduation, thus improving pressure measurement accuracy.

[0038] Furthermore, not all the content of the constitutions represented in the following examples is necessarily required for the solution of the invention described in the claims.

[0039] A first example of a center-perforated ring ceramic capacitor is illustrated in Figures 1 to 4. It comprises a ceramic base 1 and a ceramic reaction membrane 2. A hole 3 is provided in the axis of the ceramic base 1 and the ceramic reaction membrane 2 to provide an assembly passage for the circuit components to be assembled; a first ring circuit 11 is printed on one face of the ceramic base 1; the first ring circuit 11 is arranged around the hole 3.A first insulation zone 12 is provided between the inner hole of the first ring circuit 11 and the hole 3, and a second insulation zone 13 is provided between the outer periphery of the first ring circuit 11 and the outer edge of the ceramic base 1; the other face of the ceramic base 1 is provided with several pins 14, which pass through the face to reach the face on which the first ring circuit 11 is printed; the output conductor of the first ring circuit 11 is disposed in the second insulation zone 13 and is electrically connected to the pin 14; a second ring circuit 21 is printed on one face of the ceramic reaction membrane 2; the ceramic reaction membrane 2 is combined with the first ring circuit 11 of the ceramic base 1 by placing the second ring circuit 21 opposite the first.The output conductor of the second annular circuit 21 of the ceramic reaction membrane 2 is electrically connected to one of the pins 14 of the ceramic base 1; the other face of the ceramic reaction membrane 2 is intended to receive the impact of the medium to be measured, in order to undergo deformation due to pressure; an insulation layer 15 is applied to the surface of the first annular circuit 11; the first and second insulation zones 12 and 13 are coated with an insulating adhesive 16; the insulation layer 15 and the insulating adhesive 16 serve to separate the ceramic reaction membrane 2 from the ceramic base 1; the ceramic reaction membrane 2 and the ceramic base 1 are combined and sintered to form an annular capacitor.

[0040] Among them, the medium to be measured received by the other side of the ceramic reaction membrane 2 can be a medium capable of exerting pressure, such as a gas or a liquid.

[0041] The first annular circuit 11 is composed of two annular electrodes, namely a first annular electrode 111 and a second annular electrode 112; the second annular electrode 112 is arranged around the first annular electrode 111, and the first annular electrode 111 is close to the first insulation zone 12; a space is left between the first and second annular electrodes 111 and 112.

[0042] The second annular circuit 21 is composed of an annular electrode, namely a third annular electrode 211; the third annular electrode 211 covers the first and second annular electrodes 111 and 112;

[0043] More specifically, the first annular electrode 111, the second annular electrode 112 and the third annular electrode 211 are all provided with output conductors 4;

[0044] The second annular electrode 112 has an opening. The output conductor of the first annular electrode 111 exits through the opening and is electrically connected to the first pin 14. Output conductors exit from both ends of the opening of the second annular electrode 112 and are electrically connected to the second pin 14. The output conductor of the third annular electrode 211 is electrically connected to the third pin 14.

[0045] In addition, the surface area of ​​the first annular electrode 111 is larger than that of the second annular electrode 112.

[0046] More specifically, the external shape of the ceramic base 1 and the ceramic reaction membrane 2 is circular. Thus, for the ring capacitor formed by the ceramic reaction membrane 2 and the ceramic base 1, not only are the electrodes on the ceramic reaction membrane 2 and the ceramic base 1 ring-shaped, but also the external shape of the ceramic reaction membrane 2 and the ceramic base 1 is circular. With the hole in the center, the ceramic reaction membrane 2 and the ceramic base 1 are combined to form a ring capacitor.

[0047] Furthermore, the pressure surface of the reaction membrane of the discoidal ceramic capacitor without a central hole is circular. Compared to an annular pressure surface, the axial stress on the circular pressure surface is greater. During deformation under pressure, the distance from the center to the circumference of the circular pressure surface is longer, the lever arm is longer, and the deformation of the central area of ​​the circular pressure surface is greater than that of the periphery. After repeated intense pressure shocks, the reaction membrane is susceptible to degradation, which accelerates aging and cracking.

[0048] On the other hand, the ceramic base 1 and the ceramic reaction membrane 2 of the ring-shaped ceramic capacitor perforated in the center have an annular structure, and the electrodes printed on their surface also have an annular structure; When subjected to pressure, the pressure surface of the ceramic reaction membrane 2 also has an annular shape. The initial value of the annular capacitor is designed to be relatively large. Under pressure, the ceramic reaction membrane 2 requires only a slight change in shape to produce a large change in the capacitance of the annular capacitor. The deformation of the ceramic reaction membrane 2 is relatively small, which extends the membrane's lifespan and provides the pressure sensor equipped with the centrally perforated annular ceramic capacitor with improved stability and reliability.

[0049] Furthermore, by designing holes 3 in the axis of the ceramic base 1 and the ceramic reaction membrane 2 of the center-perforated annular ceramic capacitor, when the center-perforated annular ceramic capacitor is applied in a combination sensor such as a temperature-pressure sensor, it provides an assembly passage allowing the wires of the temperature sensor, which must be installed before the center-perforated annular ceramic capacitor, to pass through. This allows the center-perforated annular ceramic capacitor to be more easily integrated into the complex circuit of the existing temperature and pressure sensor, simplifies the overall structure of the temperature and pressure sensor, including the circuit and sealing structure, and also improves the assembly efficiency of the circuit of the center-perforated annular ceramic capacitor, the temperature sensor, and the control and processing section.It simplifies assembly procedures, enables automated assembly, directly improves assembly efficiency, and reduces assembly costs.

[0050] Among them: (1) By using the temperature and pressure sensor with the annular ceramic capacitor perforated in the center, compared to prior products using the discoidal ceramic capacitor without a hole in the center, i.e., patented invention CN108414030B, the number of parts in the sealing structure is reduced by one base and two sealing gaskets. The number of parts to be assembled is reduced, material costs are decreased, assembly procedures are reduced, and assembly costs are also reduced.

[0051] (2) In the circuit structure, the temperature sensor of the temperature sensor and the previous pressure sensor used a flexible cable. For the wires from the temperature sensor located on the axis of the temperature-pressure sensor to reach the circuit board of the control and processing section, they had to be guided from the axis to the flattened recess on the peripheral face of the discoidal ceramic capacitor during installation, and then through the recess to be soldered. Because the temperature sensor used a flexible cable, assembly of this temperature-pressure sensor could only be performed manually, and the cable soldering could also only be performed manually, which prevented The automation of assembly increased assembly procedures, reduced assembly efficiency, and significantly increased assembly costs. By using a center-perforated ring ceramic capacitor, the temperature and pressure sensor wires can be replaced with pins. During automated assembly of the temperature sensor, the pins can directly pass through hole 3 in the center of the center-perforated ring ceramic capacitor to reach the corresponding pin holes in the control and processing section. Then, the pins of the center-perforated ring ceramic capacitor are also aligned with the corresponding pin holes in the control and processing section.Automatic soldering is used directly to solder the pins of the temperature sensor and the center-perforated ring ceramic capacitor to the circuit board of the control and processing section, thus simplifying assembly procedures, achieving automatic soldering of the temperature sensor and the center-perforated ring ceramic capacitor, directly improving assembly efficiency and reducing assembly costs.

[0052] In one possible embodiment,

[0053] Regarding the diameter of the hole 3 in the center of the ceramic base 1 and the ceramic reaction membrane 2, the diameter of the hole 3 does not exceed 3.5 mm.

[0054] Furthermore, the error of coincidence between the axis of the hole 3, the axis of the ceramic base 1 and the axis of the ceramic reaction membrane 2 does not exceed 3 mm.

[0055] Regarding the thickness of the ceramic reaction membrane 2, the thickness of the ceramic reaction membrane 2 is between 0.2 and 1.2 mm.

[0056] During application, the ceramic reaction membrane 2 with a hole in the center can be manufactured with a minimum thickness of 0.2 mm, which reduces the overall thickness of the annular capacitor, then further reduces the overall height of the temperature and pressure sensor equipped with the annular capacitor, reduces the volume of the sensor and further improves its degree of integration; A smaller temperature and pressure sensor means that the volume requirements for installation scenarios can be higher, the barriers to the application of the temperature and pressure sensor are lower, and the scope of application is wider.

[0057] In addition, a thinner ceramic reaction membrane 2 gives the ring capacitor higher sensitivity, enabling the detection of liquids with smaller pressure variations, finer pressure detection, a wider application range and the ability to be used in low pressure scenarios.

[0058] Furthermore, regarding the variation in capacitance of the ring capacitor, when the ceramic reaction membrane 2 is subjected to pressure, the variation in capacitance of the ring capacitor is between 1 and 30 pf.

[0059] The capacitance of the ring capacitor is between 10 and 80 pf; That is to say, the initial capacitance value of the ring capacitor during pressure measurement is between 10 and 80 pf, with a wider initial capacitance value range.

[0060] By comparison tests: Y1 is the ring capacitor of the invention, Y2 is the discoidal ceramic capacitor without a hole in the center; Capacitor shape; Reaction membrane thickness; Initial capacitance value; Under 0.5 MPa pressure Under 1 MPa pressure Electrical capacitance Capacitance change Electrical capacitance Capacitance change; Y1; 0.2; 61.65 pf 64.34 pf 2.69 pf 67.88 pf 6.23 pf Y1; 0.5; 38.61 pf 39.96 pf 1.35 pf 40.56 pf 1.95 pf Y1; 0.6; 21.81 pf 22.83 pf 1.02 pf 23.32 pf 1.51 pf Y2; 0.2; / / / / / Y2; 0.5; 25.63 pf 28.38 pf 2.75 pf 29.92 pf 4.29 pf Y2; 0.6; 23.36 pf 24.91 pf 1.55 pf 27.37 pf 4.01 pf

[0061] During application, based on comparative test data, it can be concluded that the ring-shaped ceramic capacitor with a central perforation has a higher initial capacitance value and capacitance variation than the disc-shaped ceramic capacitor without a central perforation. This gives it a wider measuring range and finer measurement graduation, meaning it can detect a larger pressure range and finer pressure detection levels, thus improving the pressure measurement accuracy of the temperature and pressure sensor equipped with the ring-shaped ceramic capacitor with a central perforation.

[0062] Regarding the key ingredients of the insulating adhesive 16 covering the first insulation zone 12 and the second insulation zone 13, the material of the insulating adhesive 16 contains 60 to 80% glass powder.

[0063] Regarding the key ingredients of the transparent insulation layer 15 covering the first annular circuit 11, the material of the insulation layer 15 contains 70 to 90% glass powder.

[0064] Regarding the key ingredients of the first ring circuit 11 and the second ring circuit 21, the printing material of the first ring circuit 11 and the second ring circuit 21 is gold.

[0065] During application, the glass powder forms an insulating layer after sintering, and the glass powder content determines the insulating properties and the degree insulation of the insulation layer. Different areas have different insulation property requirements to maximize the electrical capacitance and capacitance variation of the ring capacitor.

[0066] The technical features of each of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features of each of the above embodiments are described.

Claims

1. Demands A ring-shaped ceramic capacitor with a central perforation comprises a ceramic base (1) and a ceramic reaction membrane (2), in which the axes of the ceramic base (1) and of the ceramic reaction membrane (2) are respectively provided with a through hole (3) in order to provide an assembly passage for the circuit components to be assembled; a first annular circuit (11) is printed on one face of the ceramic base (1); the first annular circuit (11) is arranged around the hole (3), a first insulation zone (12) is provided between the inner hole of the first annular circuit (11) and the hole (3), and a second insulation zone (13) is provided between the outer periphery of the first annular circuit (11) and the outer edge of the ceramic base (1); the other face of the ceramic base (1) is provided with several pins (14), which pass through the face to reach the face on which the first ring circuit (11) is printed; the output conductor of the first ring circuit (11) is disposed in the second insulation zone (13) and is electrically connected to the pin (14); a second ring circuit (21) is printed on one face of the ceramic reaction membrane (2); the ceramic reaction membrane (2) is combined with the ceramic base (1) so that the second ring circuit (21) is positioned opposite the first ring circuit of the base (11); the output conductor of the second ring circuit (21) of the ceramic reaction membrane (2) is electrically connected to one of the pins (14) of the ceramic base (1); the other face of the ceramic reaction membrane (2) is designed to receive the impact of the medium to be measured, in order to undergo deformation due to pressure; an insulating layer (15) is applied to the surface of the first annular circuit (11); the first and second insulating zones (12) and (13) are coated with an insulating adhesive (16); the insulating layer (15) and the insulating adhesive (16) are intended to separate the ceramic reaction membrane (2) from the ceramic base (1); the ceramic reaction membrane (2) and the ceramic base (1) are combined and sintered to form a ring capacitor; the capacitance of the ring capacitor is between 10 and 80 pf.

2. The ring-shaped ceramic capacitor with a hole in the center according to claim 1, characterized in that the diameter of the hole (3) does not exceed 3.5 mm.

3. The ring-shaped ceramic capacitor with a center perforation according to claim 1, characterized in that the error of coincidence between the axis of the hole (3), the axis of the ceramic base 1 and the axis of the ceramic reaction membrane (2) does not exceed 3 mm.

4. The ring-shaped ceramic capacitor perforated in the center according to claim 1, characterized in that the thickness of the ceramic reaction membrane (2) is between 0.2 and 1.2 mm.

5. The ring-shaped ceramic capacitor with a center perforation according to claim 1, characterized in that after the ceramic reaction membrane (2) is subjected to pressure, the capacitance variation of the ring-shaped capacitor is between 1 and 30 pf.

6. The center-perforated ring ceramic capacitor according to claim 1, characterized in that the insulating adhesive material (16) contains 60 to 80% glass powder.

7. The ring-shaped ceramic capacitor with a center perforation according to claim 1, characterized in that the material of the insulation layer (15) contains 70 to 90% glass powder.

8. The center-perforated ring ceramic capacitor according to claim 1, characterized in that the printing material of the first ring circuit (11) and the second ring circuit (21) is gold.

9. The center-perforated ring ceramic capacitor according to claim 1, characterized in that the first ring circuit (11) is composed of two ring electrodes (112), namely a first ring electrode (111) and a second ring electrode (112); the second ring electrode (112) is arranged around the first ring electrode (111), and the first ring electrode (111) is close to the first isolation zone (12); a space is left between the first and second annular electrode (111) and (112).

10. The center-perforated ring ceramic capacitor according to claim 9, characterized in that the second ring circuit (21) is composed of a ring electrode, namely a third ring electrode (211); the third ring electrode (211) covers the first and second ring electrodes (112).