Square pressure ceramic capacitor core

Abstract

The utility model discloses a square pressure ceramic capacitor core, include: square ceramic base, square ceramic diaphragm, its rim four -around through glass sealant with square ceramic base bottom sintering seal fixed, form sealed cavity, upper printing electrode and lower printing electrode are printed on the opposite surface of square ceramic diaphragm and square ceramic base respectively and are located in sealed cavity, form the two poles of electric capacity, constitute variable capacitance structure, pin, pass through the through -hole of square ceramic base, and are connected with lower printing electrode electricity through conductive silver glue, the square pressure ceramic capacitor core of the utility model compares as follows with existing circular ceramic capacitor core, under the premise of guaranteeing precision and stability, the volume weight is smaller, and the application field is wider, and the processing is simpler, and the loss is lower, and the weight and the volume are smaller, and the lightweight design is more superior, and the economic benefit is higher.

Description

Technical Field

[0001] This utility model relates to the field of pressure ceramic capacitor cores. More specifically, this utility model relates to a square pressure ceramic capacitor core. Background Technology

[0002] Ceramic capacitors are widely used in pressure sensors. They consist of a ceramic base and a ceramic diaphragm structure, with the base and diaphragm sealed together by sintering with glass paste. Gold electrode patterns are printed inside the capacitor cavity, forming a variable capacitor. When the pressure of the medium acting on the diaphragm changes, the capacitance between the two changes accordingly. A conditioning chip converts this capacitance change signal and outputs it to subsequent stages. Traditional pressure sensors typically use a circular ceramic capacitor core, which has several technical limitations. First, the circular structure results in low material utilization, with approximately 30% scrap material loss during the base and diaphragm manufacturing process. Second, the circular design requires a large installation space, typically with a diameter of 15mm or more, limiting its application in compact devices. Utility Model Content

[0003] To achieve these objectives and other advantages according to the present invention, a preferred embodiment of the present invention provides a square pressure ceramic capacitor core, comprising:

[0004] Square ceramic base;

[0005] A square ceramic diaphragm is sintered and sealed to the bottom of the square ceramic base with glass sealant around its edges to form a sealed cavity;

[0006] The upper and lower printed electrodes are printed on the opposite surfaces of the square ceramic diaphragm and the square ceramic base, respectively, and are located in the sealed cavity to form the two poles of a capacitor, thus constituting a variable capacitor structure.

[0007] The pin passes through the through hole of the square ceramic base and is electrically connected to the lower printed electrode via conductive silver paste.

[0008] Preferably, the pin has a dotted structure and is interference-fitted with the through hole of the ceramic base to enhance installation stability.

[0009] Preferably, the through holes of the square ceramic base are filled with conductive silver paste.

[0010] Preferably, the thickness of the glass sealant is controlled to form a preset gap between the upper and lower printed electrodes to constitute a capacitor.

[0011] Preferably, the edge of the square ceramic diaphragm is provided with an annular groove, the cross-section of which is trapezoidal, for accommodating excess glass sealant and forming a sealed overflow area.

[0012] Preferably, the ceramic base has stress relief holes at its four corners.

[0013] This utility model has at least the following beneficial effects: Compared with the existing circular ceramic capacitor core, the square pressure ceramic capacitor core of this utility model has the following advantages: while ensuring accuracy and stability, it has a smaller size and weight, and a wider range of applications; it is easier to process and has lower losses; it is smaller in weight and size, and has a better lightweight design; and it has higher economic benefits.

[0014] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall shape of the square pressure ceramic capacitor core in this utility model.

[0016] Figure 2 This is a schematic diagram of the arrangement structure of the square pressure ceramic capacitor core in this utility model.

[0017] Figure 3 This is a cross-sectional view of the square ceramic base in this utility model.

[0018] Figure 4 This is a shape diagram of the upper printed electrode in this utility model.

[0019] Figure 5 This is a shape diagram of the lower printed electrode in this utility model. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0021] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0022] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation of this utility model.

[0023] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0024] like Figures 1-3 As shown, a preferred embodiment of this utility model provides a square pressure ceramic capacitor core, comprising:

[0025] Square ceramic base 1;

[0026] A square ceramic diaphragm 2 is sintered and sealed to the bottom of the square ceramic base 1 with glass sealant 3 around its edges to form a sealed cavity 3.

[0027] The upper printed electrode 4 and the lower printed electrode 5 are respectively printed on the opposite surfaces of the square ceramic diaphragm and the square ceramic base and are located in the sealed cavity, forming the two poles of the capacitor and constituting a variable capacitor structure.

[0028] The pin 6 passes through the through hole of the square ceramic base and is electrically connected to the lower printed electrode through conductive silver paste.

[0029] In the above technical solution, the square structure design reduces the volume and weight compared to the traditional circular core, improves material utilization, and maintains excellent sealing performance and capacitance stability, making it suitable for more compact installation spaces. The specific principle is as follows: When external pressure is applied to the diaphragm 2, its deformation causes a change in the distance between the upper electrode 4 and the lower electrode 5, resulting in a change in capacitance value, which is then output as an electrical signal through the pin 6.

[0030] Both the upper printed electrode 4 and the lower printed electrode 5 are printed with precision patterns using screen printing.

[0031] in, Figure 4 and Figure 5These are the shape diagrams of the upper and lower printed electrodes, respectively. By alternately stacking the metal electrodes, the effective electrode area is significantly increased, thereby achieving the required capacitance value while miniaturizing the device. The electrode edges may be slightly extended or rounded to reduce local electric field concentration and prevent dielectric breakdown.

[0032] In another technical solution, the pin 6 adopts a dotted structure, which is interference-fitted with the through hole of the ceramic base to enhance installation stability. The dotted structure and the interference fit with the through hole result in a small deviation in the verticality of the pin installation, improved uniformity of the conductive silver paste filling, and increased product yield.

[0033] In another technical solution, conductive silver paste 7 is filled into the through-hole of the square ceramic base. Filling the through-hole with conductive silver paste reduces the contact resistance between the pin and the lower electrode, improving connection reliability under high temperature and high humidity environments.

[0034] In another technical solution, the thickness of the glass sealant 3 is controlled to form a preset gap between the upper printed electrode 4 and the lower printed electrode 5 to form a capacitor.

[0035] In another technical solution, the edge of the square ceramic diaphragm is provided with an annular groove. The cross-section of the annular groove is trapezoidal, which is used to accommodate excess glass sealant and form a sealing overflow area. The trapezoidal annular groove design increases the glass sealant overflow control area, greatly reduces the probability of sealant failure, and improves the sintering yield.

[0036] In another technical solution, stress relief holes are provided at the four corners of the square ceramic base. These stress relief holes reduce the stress concentration factor at the corners, thus improving the product's impact resistance.

[0037] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A square pressure ceramic capacitor core, characterized in that, include: Square ceramic base; A square ceramic diaphragm is sintered and sealed to the bottom of the square ceramic base with glass sealant around its edges to form a sealed cavity; The upper and lower printed electrodes are printed on the opposite surfaces of the square ceramic diaphragm and the square ceramic base, respectively, and are located in the sealed cavity to form the two poles of a capacitor, thus constituting a variable capacitor structure. The pin passes through the through hole of the square ceramic base and is electrically connected to the lower printed electrode via conductive silver paste.

2. The square pressure ceramic capacitor core according to claim 1, characterized in that, The pins adopt a dotted structure and are interference-fitted with the through holes of the ceramic base to enhance installation stability.

3. The square pressure ceramic capacitor core according to claim 1, characterized in that, Conductive silver paste is filled into the through holes of the square ceramic base.

4. The square pressure ceramic capacitor core according to claim 1, characterized in that, The thickness of the glass sealant is controlled to form a preset gap between the upper and lower printed electrodes to constitute a capacitor.

5. The square pressure ceramic capacitor core according to claim 1, characterized in that, The square ceramic diaphragm has an annular groove on its edge. The annular groove has a trapezoidal cross-section and is used to accommodate excess glass sealant and form a sealing overflow area.

6. The square pressure ceramic capacitor core according to claim 1, characterized in that, The square ceramic base has stress relief holes at its four corners.

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