Hollow transducer with electrode lead-out column

Abstract

The utility model relates to the technical field of focused ultrasound, in particular to a hollow transducer with an electrode lead-out column, which is applied to a piezoelectric high-frequency focused transducer with a middle hole. Comprising a piezoelectric plate, the piezoelectric plate is in a bowl shape, the inner surface of the piezoelectric plate is a concave surface, the outer surface of the piezoelectric plate is a convex surface, a through hole is formed in the middle of the piezoelectric plate, an electrode base is installed below the concave surface of the piezoelectric plate, and a leading-out column is installed on the electrode base and inserted into the through hole. A flanging process is replaced by the conductive metal structure, a better electrode leading-out effect is achieved, the reliability and the yield are improved, the effective radiation area of the piezoelectric plate is increased, and the output efficiency of the piezoelectric plate is improved.

Description

Technical Field

[0001] This utility model relates to the field of focused ultrasound technology, and in particular to a hollow transducer with electrode lead-out posts, which is applied to a piezoelectric high-frequency focused transducer with a central hole. Background Technology

[0002] The main working principle of a piezoelectric high-frequency focusing transducer with a central hole is to utilize the piezoelectric effect of piezoelectric ceramics. The piezoelectric ceramic is designed as a spherical focusing structure to achieve ultrasonic wave emission and focusing. When using the thickness mode of the piezoelectric sheet to vibrate and emit ultrasonic waves, silver layers are usually plated on its concave and convex surfaces to conduct electricity, which are then connected to the positive and negative terminals of the power supply, respectively.

[0003] Considering that the external radiating surface of a transducer generally should not have solder leads or contacts, conventionally, the electrodes of the piezoelectric element are led out by flanging and cutting isolation grooves, so that the solder points or contacts are located on the convex surface of the piezoelectric element. However, at higher frequencies, because the thickness of the piezoelectric element is very thin (according to the formula frequency constant N = thickness * resonant frequency, for a certain type of piezoelectric ceramic material, the higher the frequency, the thinner the thickness), using a laser to cut the isolation grooves is very easy to produce scorch marks, resulting in extremely low production yield and cumbersome process steps, while also affecting its appearance and performance. Furthermore, because the silver plating is prone to peeling off under heat or tension, its reliability is poor. Summary of the Invention

[0004] The technical problem to be solved by this utility model is: in order to solve the problems existing in the prior art in the background art, to provide a hollow transducer with electrode lead-out column that has a stable structure to replace the traditional flanging process, can improve the output performance of piezoelectric materials under the same conditions, and improves the reliability and yield of products for mass production.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a hollow transducer with an electrode lead-out post, including a piezoelectric sheet, the piezoelectric sheet being bowl-shaped, the inner surface of the piezoelectric sheet being concave, the outer surface of the piezoelectric sheet being convex, a through hole being provided in the middle of the piezoelectric sheet, an electrode seat being installed below the concave surface of the piezoelectric sheet, and a lead-out post being installed on the electrode seat, the lead-out post being inserted into the through hole.

[0006] Furthermore, the electrode holder is a conductive metal electrode holder.

[0007] Furthermore, the portion of the piezoelectric sheet that contacts the electrode holder is coated with an insulating layer or padded with a plastic gasket.

[0008] Furthermore, the lead-out post is welded to the concave surface of the piezoelectric element. This welding is performed using direct contact electric welding or by welding with fine silver wires at both ends.

[0009] Furthermore, a coaxial line is welded between the convex surface of the piezoelectric sheet and the electrode holder.

[0010] The beneficial effects of this utility model are as follows: This utility model uses a conductive metal structure to replace the flanging process, which achieves a better electrode lead-out effect. While improving reliability and yield, it also increases the effective radiation area of ​​the piezoelectric sheet and improves its output efficiency. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is an exploded view of this utility model;

[0014] In the diagram: 1. Piezoelectric element, 3. Through hole, 4. Electrode holder, 5. Lead-out post. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0016] like Figures 1-2 The hollow transducer with electrode lead-out post shown is used in the transducer of a superficial tissue treatment gun. It includes a piezoelectric sheet 1, which is a piezoelectric ceramic sheet. The piezoelectric sheet 1 is bowl-shaped, with a concave inner surface and a convex outer surface. A through hole 3 is provided in the middle of the piezoelectric sheet 1. An electrode seat 4 is installed below the concave surface of the piezoelectric sheet 1, and a lead-out post 5 is installed on the electrode seat 4. The lead-out post 5 is inserted into the through hole 3.

[0017] The electrode holder is designed according to the piezoelectric material of the piezoelectric element 1 and the size of the transducer. The electrode holder 4 is a conductive metal electrode holder, such as copper or other metals with good conductivity.

[0018] The portion of the concave surface of the piezoelectric element 1 that contacts the electrode base 4 is coated with an insulating layer or padded with a plastic gasket.

[0019] The lead-out post 5 is welded to the concave surface of the piezoelectric sheet 1. This welding is performed by direct contact electric welding or by welding with fine silver wires at both ends.

[0020] A coaxial line is welded between the convex surface of the piezoelectric sheet 1 and the electrode base 4. That is, one end of the coaxial line is welded to the convex surface of the piezoelectric sheet 1, and the other end of the coaxial line (usually the ground end) is welded to the electrode base 4 as a lead-out.

[0021] Specifically, the lead-out post 5 is installed in the middle position of the electrode holder 4. The part of the electrode holder 4 that contacts the convex surface of the piezoelectric sheet 1 can be sprayed with an insulating layer or a plastic gasket can be placed on it, as long as it prevents the electrode holder 4 from conducting electricity with the piezoelectric sheet 1.

[0022] Then, insert the lead-out post 5 into the through hole 3, with the top surface of the lead-out post 5 flush with or slightly higher than the concave surface of the piezoelectric sheet 1.

[0023] Next, the top surface of the lead-out post 5 is welded to the concave surface of the piezoelectric sheet 1;

[0024] Finally, a coaxial line is welded between the convex surface of the piezoelectric element 1 and the electrode holder 4 to complete the installation.

[0025] This design utilizes a conductive metal structure instead of a flanged process to achieve better electrode lead-out and thus better circuit integration.

[0026] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A hollow transducer with electrode lead-out columns, characterized in that: Includes a piezoelectric sheet (1), which is bowl-shaped, with a concave inner surface and a convex outer surface. A through hole (3) is provided in the middle of the piezoelectric sheet (1). An electrode holder (4) is installed below the concave surface of the piezoelectric sheet (1), and a lead-out post (5) is installed on the electrode holder (4). The lead-out post (5) is inserted into the through hole (3).

2. A hollow transducer with electrode lead-out columns according to claim 1, characterized in that: The electrode holder (4) is a conductive metal electrode holder.

3. A hollow transducer with electrode lead-out columns according to claim 1, characterized in that: The portion of the concave surface of the piezoelectric sheet (1) that contacts the electrode base (4) is coated with an insulating layer or padded with a plastic gasket.

4. A hollow transducer with electrode lead-out columns according to claim 1, characterized in that: The lead-out post (5) is welded to the concave surface of the piezoelectric sheet (1) by direct contact welding or by welding with fine silver wires at both ends.

5. A hollow transducer with electrode lead-out columns according to claim 1, characterized in that: The convex surface of the piezoelectric sheet (1) is welded to the electrode seat (4) with a coaxial line.

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