A piezoelectric buzzer for a piezoelectric power generation floor

Abstract

This application discloses a piezoelectric buzzer for a piezoelectric power generation floor, relating to the field of electronic component technology. It includes: a substrate made of an oxidation-resistant conductive material, with its lower side serving as a lower electrode contact surface; a piezoelectric sheet fixed to the upper side of the substrate, with a graphite electrode disposed on its upper side, the central region of the upper side of the graphite electrode serving as an upper electrode contact surface; and an insulating layer disposed in the remaining areas excluding the upper and lower electrode contact surfaces. The advantages of this application are: the substrate uses an oxidation-resistant conductive material, which maintains a stable chemical state even under prolonged exposure to a humid environment, exhibiting better oxidation resistance than copper sheets; the continuous and complete insulating layer isolates direct contact between the upper and lower electrodes, effectively preventing short circuits between electrodes, improving electrical safety, and avoiding short circuits between the graphite electrode and the edge conductive portion when attaching surface electrodes.

Description

Technical Field

[0001] This application relates to the field of electronic component technology, and in particular discloses a piezoelectric buzzer for a piezoelectric power generation floor. Background Technology

[0002] Piezoelectric power generation technology, especially piezoelectric power generation systems applied to floors, has received widespread attention in recent years because it can directly convert widely existing mechanical energy into electrical energy. Piezoelectric buzzers are the core energy conversion components of such power generation floors, and their performance and reliability directly affect the power generation efficiency and lifespan of the entire system.

[0003] In traditional piezoelectric power generation floor snorkel designs, the substrate is usually made of a highly conductive metal material, such as copper sheet, as the support for the lower electrode and the conductive path. However, throughout the service life, the environment in which the copper sheet is located is not completely dry and may frequently be exposed to a humid environment. Its surface is very prone to oxidation reaction, generating copper oxide and other materials with poor conductivity. This oxidation phenomenon will significantly increase the contact resistance of the lower electrode contact surface, hindering the effective collection and conduction of charge, resulting in a significant decrease in power generation efficiency over time, which seriously affects the long-term stability and output power of the piezoelectric power generation device.

[0004] Furthermore, the existing insulation protection structure of piezoelectric buzzers also has limitations. In order to ensure effective external contact between the upper and lower electrode contact surfaces, insulation treatment is usually required in non-contact areas to prevent short circuits or leakage. Common practices include applying insulating varnish to specific areas, pasting local insulating tape, or simply covering the electrode edges. However, these methods often fail to form a continuous, complete, and robust insulation barrier. When attaching surface electrodes, short circuits can easily occur. At the same time, under the long-term repeated mechanical impacts, vibrations, and possible environmental stresses, local or discontinuous insulation layers are prone to cracking, peeling, or local failure. This increases the risk of short circuits between electrodes, reduces the electrical safety of the system, and may also cause moisture and pollutants in the environment to directly corrode the piezoelectric ceramic layer or electrode interface, further accelerating the aging and performance degradation of the component. Therefore, improvements are needed. Utility Model Content

[0005] The purpose of this application is to provide a piezoelectric buzzer for a piezoelectric power generation floor, which has better anti-oxidation properties and an insulating protective structure.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: a piezoelectric buzzer for a piezoelectric power generation floor, comprising: a substrate, the substrate being made of a conductive material with antioxidant properties, the lower side of the substrate serving as a lower electrode contact surface; a piezoelectric sheet, the piezoelectric sheet being fixed to the upper side of the substrate, a graphite electrode being disposed on the upper side of the piezoelectric sheet, the central region of the upper side of the graphite electrode serving as an upper electrode contact surface; and an insulating layer, the insulating layer being disposed in the remaining areas excluding the upper electrode contact surface and the lower electrode contact surface.

[0007] As a preferred embodiment, the conductive material includes stainless steel, tin-plated tinplate, nickel sheet, or carbon fiber sheet.

[0008] Further preferably, the conductive material is stainless steel.

[0009] As a preferred embodiment, the edge of the upper side of the graphite electrode is coated with insulating varnish or insulating adhesive, and the central area is exposed to form the upper electrode contact surface.

[0010] As a preferred embodiment, the insulating layer is formed by coating the remaining areas of the piezoelectric buzzer, excluding the upper electrode contact surface and the lower electrode contact surface, with insulating adhesive and / or insulating varnish.

[0011] As a preferred embodiment, both the substrate and the piezoelectric sheet are circular, the substrate and the piezoelectric sheet are coaxially arranged, and the diameter of the substrate is greater than or equal to the diameter of the piezoelectric sheet.

[0012] As a preferred embodiment, the piezoelectric sheet includes a piezoelectric ceramic layer, which is fixed on the upper side of the substrate. The upper side of the piezoelectric ceramic layer is coated with graphite slurry and cured to form the graphite electrode.

[0013] More preferably, the piezoelectric ceramic layer is bonded to the substrate with conductive adhesive.

[0014] Further preferably, the piezoelectric ceramic layer is sintered and connected to the substrate.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] (1) Significantly improved oxidation resistance of the substrate: Compared with the copper sheet used in the prior art, the substrate in this application uses a conductive material with oxidation resistance. Even when in a humid environment for a long time, it can still maintain a stable chemical form and has better oxidation resistance than copper sheet. This allows the lower side of the substrate, as the lower electrode contact surface, to maintain low contact resistance and good conductivity for a long time, effectively ensuring the efficient and stable transfer of charge from the piezoelectric sheet to the external circuit, and significantly improving the power generation efficiency stability and overall lifespan of the component during long-term service.

[0017] (2) Excellent insulation performance: This application forms a continuous and complete insulating layer by coating all areas except the upper electrode contact surface and the lower electrode contact surface with insulating adhesive and / or insulating varnish, which isolates the direct contact between the upper electrode and the lower electrode, effectively prevents short circuits between electrodes, improves electrical safety, and avoids short circuits between the graphite electrode and the edge conductive part when attaching the surface electrode; the continuous and comprehensive insulating layer has excellent mechanical strength and adhesion, which can effectively resist the unavoidable repeated mechanical impacts, vibrations, and environmental stresses such as temperature changes and moisture intrusion in the application of piezoelectric power generation floor, greatly reducing the risk of cracking and peeling of the insulating layer, enhancing the long-term reliable insulation performance, and also effectively preventing moisture and pollutants in the environment from eroding the piezoelectric ceramic layer and electrode interface, delaying the aging of the component. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a three-dimensional structural cross-sectional view of the present invention.

[0020] Figure 3 This is a three-dimensional cross-sectional view of the bonding structure between the substrate and the piezoelectric sheet of this utility model.

[0021] Figure 4 This is a three-dimensional cross-sectional view of the substrate and piezoelectric sheet of this utility model with the same diameter.

[0022] In the figure: 1. Substrate; 2. Piezoelectric ceramic layer; 3. Graphite electrode; 4. Insulating layer; 5. Conductive adhesive. Detailed Implementation

[0023] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0024] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. They should not be construed as limiting the specific protection scope of this application.

[0025] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0026] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0027] A preferred embodiment of this application, such as Figures 1 to 2 As shown, a piezoelectric buzzer for a piezoelectric power generation floor includes: a substrate 1 made of a conductive material with anti-oxidation properties, the lower side of the substrate 1 serving as a lower electrode contact surface; a piezoelectric sheet fixed on the upper side of the substrate 1, a graphite electrode 3 disposed on the upper side of the piezoelectric sheet, the central region of the upper side of the graphite electrode 3 serving as an upper electrode contact surface; and an insulating layer 4 disposed in the remaining areas except for the upper electrode contact surface and the lower electrode contact surface.

[0028] In the prior art, the substrate 1 is usually made of copper sheet. Copper sheet has good conductivity, but when it is exposed to air for a long time, especially in a humid environment, its surface is prone to oxidation, forming substances such as copper oxide. This will reduce the conductivity of the copper sheet and also reduce its service life. Therefore, in this embodiment, the substrate 1 is made of a conductive material with anti-oxidation properties. The complete replacement of this structure of the substrate 1 ensures the anti-oxidation performance of the component during long-term service. The substrate 1 is less susceptible to corrosion, its conductivity is stable, and its service life is also increased. In addition, the insulating layer 4 in this embodiment is set in the remaining area except for the upper electrode contact surface and the lower electrode contact surface. The insulating layer 4 continuously and completely covers the component, leaving only the external electrode exposed. It completely avoids the contact between the two electrodes at the component level, ensuring that there will be no short circuit. At the same time, due to the large area of ​​continuous insulation, especially the edge insulation, when the surface electrode is attached, there will be no short circuit with the conductive part at the edge, which greatly improves the insulation performance.

[0029] In this embodiment, the conductive material includes stainless steel, tin-plated tinplate, nickel sheet or carbon fiber sheet. These materials have good oxidation resistance and stable surface, and are not easily corroded even in humid environments. In this embodiment, stainless steel is preferred as the conductive material because stainless steel has low cost and very stable performance. At the same time, stainless steel is widely used in life and is easy to obtain.

[0030] In this embodiment, the edge of the upper side of the graphite electrode 3 is coated with insulating varnish or insulating adhesive, and the central area is exposed to form the upper electrode contact surface. This arrangement can prevent a short circuit between the central area and the edge conductive part of the graphite electrode 3 when the surface electrode is attached.

[0031] In this embodiment, an insulating layer 4 is formed by coating the remaining areas of the piezoelectric buzzer, excluding the upper and lower electrode contact surfaces, with insulating adhesive and / or insulating varnish. The continuous and fully covered insulating layer 4 has excellent mechanical strength and adhesion, which can effectively resist the unavoidable repeated mechanical impacts, vibrations, and environmental stresses such as temperature changes and moisture intrusion in the application of piezoelectric power generation floor. This greatly reduces the risk of cracking and peeling of the insulating layer 4, enhances the long-term reliable insulation performance, and can also effectively prevent moisture and pollutants in the environment from eroding the piezoelectric ceramic layer 2 and the electrode interface, thus delaying the aging of the component.

[0032] In this embodiment, as Figure 2 and Figure 4 As shown, both the substrate 1 and the piezoelectric sheet are circular and coaxially arranged. The diameter of the substrate 1 is greater than or equal to the diameter of the piezoelectric sheet. The mainstream solution in the prior art is that the diameters of the substrate 1 and the piezoelectric sheet are the same. With this design, the parts are easy to align during production, and the process is simple. However, the solution where the diameter of the substrate 1 is greater than the diameter of the piezoelectric sheet has better performance. When the piezoelectric sheet and the substrate 1 are the same size, there is high stress at their interface, which is prone to microcracks. When the diameter of the substrate 1 is greater than the diameter of the piezoelectric sheet, the stress concentration area moves away from the edge of the piezoelectric sheet, reducing the generation of microcracks. At the same time, the part of the substrate 1 that extends beyond the piezoelectric sheet can buffer vibration and impact, improving the resistance to mechanical impact.

[0033] In this embodiment, the piezoelectric sheet includes a piezoelectric ceramic layer 2, which is fixed on the upper side of the substrate 1. Graphite slurry is coated on the upper side of the piezoelectric ceramic layer 2 and cured to form a graphite electrode 3. In the prior art, silver electrodes are usually used, but this application uses graphite electrode 3 as a substitute, which is low in cost and has the same good oxidation resistance.

[0034] Furthermore, such as Figure 3 As shown, the piezoelectric ceramic layer 2 is bonded to the substrate 1 by conductive adhesive 5. In another embodiment, the piezoelectric ceramic layer 2 is sintered to the substrate 1. Both of the above technical solutions are existing technologies and can be directly implemented by those skilled in the art, so they will not be described in detail.

[0035] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A piezoelectric buzzer for a piezoelectric power generation floor, characterized in that, include: A substrate, the substrate being made of a conductive material with antioxidant properties, the lower side of the substrate serving as the lower electrode contact surface; A piezoelectric sheet is fixed on the upper side of the substrate, and a graphite electrode is disposed on the upper side of the piezoelectric sheet. The central area of ​​the upper side of the graphite electrode serves as the upper electrode contact surface. An insulating layer is disposed in the remaining areas except for the upper electrode contact surface and the lower electrode contact surface.

2. The piezoelectric buzzer for a piezoelectric power generation floor as described in claim 1, characterized in that, The conductive material includes stainless steel, tin-plated tinplate, nickel sheet, or carbon fiber sheet.

3. The piezoelectric buzzer for a piezoelectric power generation floor as described in claim 2, characterized in that, The conductive material is stainless steel.

4. The piezoelectric buzzer for a piezoelectric power generation floor as described in claim 1, characterized in that, The edge of the upper side of the graphite electrode is coated with insulating varnish or insulating adhesive, and the central area is exposed to form the upper electrode contact surface.

5. A piezoelectric buzzer for a piezoelectric power generation floor as described in claim 1, characterized in that, After applying insulating adhesive and / or insulating varnish to the remaining areas of the piezoelectric buzzer, excluding the upper electrode contact surface and the lower electrode contact surface, a continuous insulating layer is formed.

6. A piezoelectric buzzer for a piezoelectric power generation floor as described in claim 1, characterized in that, Both the substrate and the piezoelectric sheet are circular in shape, and the substrate and the piezoelectric sheet are coaxially arranged. The diameter of the substrate is greater than or equal to the diameter of the piezoelectric sheet.

7. A piezoelectric buzzer for a piezoelectric power generation floor as described in claim 1, characterized in that, The piezoelectric element includes a piezoelectric ceramic layer, which is fixed on the upper side of the substrate. Graphite slurry is coated on the upper side of the piezoelectric ceramic layer and cured to form the graphite electrode.

8. A piezoelectric buzzer for a piezoelectric power generation floor as described in claim 7, characterized in that, The piezoelectric ceramic layer is bonded to the substrate with conductive adhesive.

9. A piezoelectric buzzer for a piezoelectric power generation floor as described in claim 7, characterized in that, The piezoelectric ceramic layer is sintered and connected to the substrate.

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