Multi-focus ultrasonic transducer

Abstract

The multi-focus ultrasonic transducer comprises a shell, a first ceramic chip and a second ceramic chip, a first limiting space and a second limiting space are arranged in the shell; the first ceramic chip is arranged on the first limiting space and is positioned on the surface of the first spherical space; the second ceramic plate is arranged on the second limiting space and is positioned on the surface of the second spherical space; the radius of the first spherical space is smaller than or larger than that of the second spherical space; in the ultrasonic focusing direction, ultrasonic waves generated by the first ceramic wafer pass through the first sphere center of the first spherical space, and ultrasonic waves generated by the second ceramic wafer pass through the second sphere center of the second spherical space. The first ceramic chip and the second ceramic chip generate first ultrasonic waves and second ultrasonic waves respectively, the first ultrasonic waves are focused at the first sphere center to form a first focus, the second ultrasonic waves are focused at the second sphere center to form a second focus, and the focal lengths of the first focus and the second focus are different, so that the effects of multiple focuses and variable focus distance are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic transducers, and in particular to a multi-focus ultrasonic transducer. Background Art

[0002] An ultrasonic transducer is a device that can convert electrical energy into ultrasonic energy. Ultrasonic transducers are usually made of piezoelectric materials.

[0003] The patent document with application publication number CN101766870A discloses an ultrasonic transducer, which specifically discloses: it includes two or more fan-shaped spherical ceramic sheets and a hub-type frame matched with the fan-shaped spherical ceramic sheets, and the fan-shaped spherical ceramic sheets are fixed on the hub-type frame to form a large-caliber self-focusing ultrasonic transducer.

[0004] The above patent has better focusing efficiency and lower path energy loss, but still has the following problems: only single-point focusing can be achieved and the focal length cannot be adjusted. Summary of the invention

[0005] In view of the above problems existing in the prior art, an object of the present invention is to provide a multi-focus ultrasonic transducer which can achieve multi-focus focusing, and the focal length of each focus is different.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] A multi-focus ultrasonic transducer comprises a shell, a first ceramic sheet and a second ceramic sheet; a first limiting space and a second limiting space are arranged inside the shell; the first ceramic sheet is arranged on the first limiting space and is located on the surface of the first spherical space; the second ceramic sheet is arranged on the second limiting space and is located on the surface of the second spherical space; the radius of the first spherical space is smaller than or larger than the radius of the second spherical space; in the direction of ultrasonic focusing, the ultrasonic wave generated by the first ceramic sheet passes through the first center of the first spherical space, and the ultrasonic wave generated by the second ceramic sheet passes through the second center of the second spherical space.

[0008] Furthermore, when viewed from above, the first limiting space and the second limiting space are arranged adjacent to each other.

[0009] Further, the first limiting space is arranged inside the second limiting space, or the second limiting space is arranged inside the first limiting space.

[0010] Further, the first limiting space is located in a space on one side inside the shell, and the second limiting space is located in a space on the other side inside the shell.

[0011] Further, when viewed from above, a projected area of ​​the first limiting space on the horizontal plane is greater than, equal to, or smaller than a projected area of ​​the second limiting space on the horizontal plane.

[0012] Furthermore, a first fixed structure and a second fixed structure are provided inside the shell, the second fixed structure is respectively connected to the outer wall of the first fixed structure and the inner wall of the shell, the space inside the first fixed structure is defined as the first limiting space, and the space between the first fixed structure and the inner wall of the shell is defined as the second limiting space; the first ceramic sheet is provided on the first fixed structure, and the second ceramic sheet is provided on the second fixed structure.

[0013] Further, when viewed from above, the first limiting space and the second limiting space are arranged at a predetermined distance from each other.

[0014] Furthermore, the first spherical center and the second spherical center are located on the same vertical line.

[0015] Further, the first spherical center and the second spherical center are located on different vertical lines.

[0016] Furthermore, it also includes a third limiting space, which is arranged inside the shell, and a third ceramic is arranged on the third limiting space and located on the surface of the third spherical space; in the direction of ultrasonic focusing, the ultrasonic wave generated by the third ceramic sheet passes through the third center of the third spherical space.

[0017] Further, when viewed from above, the first limiting space, the second limiting space, and the third limiting space are arranged adjacent to each other; or the first limiting space, the second limiting space, and the third limiting space are arranged adjacent to each other in pairs.

[0018] Further, the second confined space is arranged inside the third confined space, and the first confined space is arranged inside the second confined space; or the first confined space is arranged inside the third confined space, and the second confined space is arranged inside the first confined space; or the first confined space is arranged inside the second confined space, and the third confined space is arranged inside the first confined space; or the second confined space is arranged inside the first confined space, and the third confined space is arranged inside the second confined space; or the third confined space is arranged inside the second confined space, and the first confined space is arranged inside the third confined space; or the third confined space is arranged inside The second confined space is arranged inside the first confined space, and the second confined space is arranged inside the third confined space; or the second confined space is adjacent to the third confined space and arranged inside the first confined space; or the first confined space is adjacent to the third confined space and arranged inside the second confined space; or the first confined space is adjacent to the second confined space and arranged inside the third confined space; or the first confined space and the second confined space are arranged inside the third confined space at intervals; or the first confined space and the third confined space are arranged inside the second confined space at intervals; or the second confined space and the third confined space are arranged inside the first confined space at intervals.

[0019] Further, the first limited space is located in one side space of the interior of the shell, the second limited space is located in the other side space of the interior of the shell, and the third limited space is arranged inside the first limited space; or the first limited space is located in one side space of the interior of the shell, the second limited space is located in the other side space of the interior of the shell, and the third limited space is arranged inside the second limited space; or the third limited space is located in one side space of the interior of the shell, the first limited space is located in the other side space of the interior of the shell, and the second limited space is arranged inside the first limited space; or the third limited space is located in one side space of the interior of the shell, the second limited space is located in the other side space of the interior of the shell, and the first limited space is arranged inside the second limited space; or the first limited space The limiting space is located in one side space of the interior of the shell, the second limiting space is located in the other side space of the interior of the shell, and the first limiting space and the second limiting space are cooperatively arranged on the periphery of the third limiting space; the first limiting space is located in one side space of the interior of the shell, the third limiting space is located in the other side space of the interior of the shell, and the second limiting space is arranged inside the third limiting space; or the second limiting space is located in one side space of the interior of the shell, the third limiting space is located in the other side space of the interior of the shell, and the first limiting space is arranged inside the third limiting space; or the first limiting space is located in the first part of the interior of the shell, the second limiting space is located in the second part of the interior of the shell, and the third limiting space is located in the remaining part of the interior of the shell.

[0020] Further, the first confined space and the second confined space are arranged inside the shell at intervals, and the third confined space is arranged inside the first confined space; or the first confined space and the second confined space are arranged inside the shell at intervals, and the third confined space is arranged inside the second confined space; or the first confined space and the third confined space are arranged inside the shell at intervals, and the second confined space is arranged inside the third confined space; or the first confined space and the third confined space are arranged inside the shell at intervals, and the second confined space is arranged inside the first confined space; or the second confined space and the third confined space are arranged inside the shell at intervals, and the first confined space is arranged inside the second confined space; or the second confined space and the third confined space are arranged inside the shell at intervals, and the first confined space is arranged inside the third confined space.

[0021] Furthermore, the first limiting space, the second limiting space and the third limiting space are arranged in pairs.

[0022] Further, the first center, the second center and the third center are located on the same vertical line; or, the first center, the second center and the third center are located on different vertical lines respectively; or, among the first center, the second center and the third center, two of them are located on the same vertical line, and the remaining one is located on another vertical line.

[0023] The beneficial effects of the present invention are:

[0024] The present invention arranges the first ceramic sheet and the second ceramic sheet on the surface of a spherical space with different radii respectively, so that the first ceramic sheet and the second ceramic sheet generate the first ultrasonic wave and the second ultrasonic wave respectively, the first ultrasonic wave is focused at the center of the first sphere to form a first focus, and the second ultrasonic wave is focused at the center of the second sphere to form a second focus, and the focal lengths of the first focus and the second focus are different, thereby achieving a multi-focus effect with a variable focal distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a three-dimensional structure of an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A cross-sectional schematic diagram of

[0027] Figure 3 yes Figure 1 A schematic top view of the middle shell, the first ceramic sheet and the second ceramic sheet;

[0028] Figure 4 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in a second embodiment of the present invention;

[0029] Figure 5 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in a third embodiment of the present invention;

[0030] Figure 6 is a cross-sectional schematic diagram of a fourth embodiment of the present invention;

[0031] Figure 7 is a schematic cross-sectional view of a fifth embodiment of the present invention;

[0032] Figure 8 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in a fifth embodiment of the present invention;

[0033] Fig. 9 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in a sixth embodiment of the present invention;

[0034] Fig.10 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in a seventh embodiment of the present invention;

[0035] Fig.11 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in an eighth embodiment of the present invention;

[0036] Fig.12 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in a ninth embodiment of the present invention;

[0037] Fig.13 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in a tenth embodiment of the present invention;

[0038] Fig.14 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in an eleventh embodiment of the present invention;

[0039] Fig.15 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in a twelfth embodiment of the present invention;

[0040] Fig.16 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in a thirteenth embodiment of the present invention;

[0041] Fig.17 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in a fourteenth embodiment of the present invention;

[0042] Fig.18 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in a fifteenth embodiment of the present invention;

[0043] Fig.19 is a schematic top view of a housing, a first ceramic sheet, and a second ceramic sheet in a sixteenth embodiment of the present invention;

[0044] Fig. 20 is a cross-sectional schematic diagram of a seventeenth embodiment of the present invention;

[0045] Fig.21 2 is a cross-sectional schematic diagram of an eighteenth embodiment of the present invention.

[0046] Reference numerals

[0047] 100. Multi-focus ultrasonic transducer; 1. housing; 11. first limited space; 12. second limited space; 13. first spherical space; 131. first spherical center; 132. first focus; 14. second spherical space; 141. second spherical center; 142. second focus; 15. first fixing structure; 16. second fixing structure; 17. third limited space; 18. third spherical space; 181. third spherical center; 182. third focus;

[0048] 2. First ceramic sheet; 3. Second ceramic sheet; 4. Electrode wire; 5. Third ceramic sheet. DETAILED DESCRIPTION

[0049] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "top surface", "bottom surface" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred position or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise specified and limited, the terms "assemble", "connect", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] The invention is further described below in conjunction with the accompanying drawings and specific embodiments. The following description is only exemplary and does not limit the protection scope of the invention.

[0053] Please refer to Figure 1-Figure 3, a multi-focus ultrasonic transducer 100, a shell 1, a first ceramic sheet 2 and a second ceramic sheet 3. A first confined space 11 and a second confined space 12 are arranged inside the shell 1. The first ceramic sheet 2 is arranged on the first confined space 11 and is located on the surface of the first spherical space 13; the second ceramic sheet 3 is arranged on the second confined space 12 and is located on the surface of the second spherical space 14. The radius of the first spherical space 13 is smaller than or larger than the radius of the second spherical space 14. As a preferred embodiment, in this embodiment, the radius of the first spherical space 13 is smaller than the radius of the second spherical space 14. In the direction of ultrasonic focusing, the ultrasonic wave generated by the first ceramic sheet 2 passes through the first spherical center 131 of the first spherical space 13, and the ultrasonic wave generated by the second ceramic sheet 3 passes through the second spherical center 141 of the second spherical space 14.

[0054] By applying voltage to the first ceramic sheet 2 and the second ceramic sheet 3 respectively to cause the reverse piezoelectric effect, the electrical signal is converted into an ultrasonic signal. The ultrasonic signal of the first ceramic sheet 2 is emitted in the direction of the first spherical center 131 and forms a first focus 132 (in order to better represent the first focus 132, the position of the first focus 132 is set on the first spherical center 131). The ultrasonic signal of the second ceramic sheet 3 is emitted in the direction of the second spherical center 141 and forms a second focus 142 (in order to better represent the second focus 142, the position of the second focus 142 is set on the second spherical center 141).

[0055] It should be noted that, in the present invention, “observation from above” refers to observing the multi-focus ultrasonic transducer 100 from a top-down visual angle when the multi-focus ultrasonic transducer 100 only has the shell 1 , the first ceramic sheet 2 , and the second ceramic sheet 3 .

[0056] In this embodiment, when viewed from above, the first limiting space 11 and the second limiting space 12 are arranged adjacent to each other. Figure 3 The first limiting space 11 is arranged inside the second limiting space 12 .

[0057] Of course, the second limiting space 12 may also be arranged inside the first limiting space 11 (since only Figure 3 On the basis of, the first limiting space 11 and the second limiting space 12 are simply changed in position, so they are not drawn), which is determined by the actual working conditions and is not limited here.

[0058] Specifically, a first fixed structure 15 and a second fixed structure 16 are provided inside the shell 1, and the second fixed structure 16 is connected to the outer wall of the first fixed structure 15 and the inner wall of the shell 1, respectively. In the present embodiment, the first fixed structure 15 is a hollow cylindrical structure, and of course it can also be a hollow annular structure (circular ring, square ring, etc.), which is not limited here. The internal space of the first fixed structure 15 is connected to the internal space of the shell 1, and the internal space of the first fixed structure 15 is defined as the first limiting space 11, and the space between the first fixed structure 15 and the inner wall of the shell 1 is defined as the second limiting space 12. The first ceramic sheet 2 is provided inside the first fixed structure 15, and the second ceramic sheet 3 is provided on the second fixed structure 16.

[0059] In this embodiment, when viewed from the vertical cross section of the housing 1, the projection of the first ceramic sheet 2 and the projection of the second ceramic sheet 3 are curved surfaces, and the curvature of the first ceramic sheet 2 is substantially the same as the curvature of the second ceramic sheet 3. Of course, the curvature of the first ceramic sheet 2 and the curvature of the second ceramic sheet 3 may also be different, which is not limited here.

[0060] In this embodiment, a vertical line (not shown in the figure) passes through the first ceramic sheet 2, and the first spherical center 131 and the second spherical center 141 are respectively located on the vertical line. Figure 2 , a horizontal plane a is parallel to the shell 1 , and the projection of the first spherical center 131 on the horizontal plane a and the projection of the second spherical center 141 on the horizontal plane a are located at the same position.

[0061] The working principle of the present invention is described below to facilitate a better understanding of the present invention:

[0062] The present invention uses two electrode wires 4 to apply voltages to the first ceramic sheet 2 and the second ceramic sheet 3 respectively, so that the first ceramic sheet 2 and the second ceramic sheet 3 have a reverse piezoelectric effect, that is, the first ceramic sheet 2 and the second ceramic sheet 3 are deformed, the first ceramic sheet 2 converts the electrical signal into a first ultrasonic wave, and transmits it in the direction of the first spherical center 131, and focuses at the first spherical center 131 to form a first focus 132, and the second ceramic sheet 3 also converts the electrical signal into an ultrasonic wave, and transmits it in the direction of the second spherical center 141, and focuses at the second spherical center 141 to form a second focus 142. At the same time, since the position of the first spherical center 131 and the position of the second spherical center 141 are different, it is equivalent to that the positions of the first focus 132 and the second focus 142 are also different. Thereby achieving a multi-focus effect with a variable focal distance.

[0063] Please refer to Figure 4 , Figure 4 1 is a top view of the second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that the positions of the first limiting space 11 and the second limiting space 12 are changed, specifically:

[0064] In this embodiment, the first limiting space 11 is located in one side of the space inside the housing 1, and the second limiting space 12 is located in the other side of the space inside the housing 1. Specifically, the horizontal plane a is parallel to the housing 1, and when viewed from above, the projection area of ​​the first limiting space 11 on the horizontal plane a is equal to the projection area of ​​the second limiting space 12 on the horizontal plane a (i.e., Figure 4 As shown). Of course, the projection area of ​​the first confined space 11 on the horizontal plane a can be larger than the projection area of ​​the second confined space 12 on the horizontal plane a. The projection area of ​​the first confined space 11 on the horizontal plane a can also be smaller than the projection area of ​​the second confined space 12 on the horizontal plane a. The projection area of ​​the first confined space 11 and the projection area of ​​the second confined space 12 are selected according to the actual working conditions and are not limited here.

[0065] Other technical features and technical effects are consistent with those of the first embodiment and are not described in detail here. Figures 1 to 3 Explanation of the contents.

[0066] Please refer to Figure 5 , Figure 5 3 is a top view of the third embodiment of the present invention. The difference between the third embodiment and the first embodiment is that the positions of the first limiting space 11 and the second limiting space 12 are changed, specifically:

[0067] In this embodiment, when viewed from above, the first limiting space 11 and the second limiting space 12 are spaced apart by a predetermined distance. The specific spacing distance is determined by actual working conditions and is not limited here.

[0068] Other technical features and technical effects are consistent with those of the first embodiment and are not described in detail here. Figures 1 to 3 Explanation of the contents.

[0069] Please refer to Figure 6 , Figure 6 1 is a cross-sectional schematic diagram of a fourth embodiment of the present invention. The fourth embodiment differs from the first embodiment in that the positions of the first spherical center 131 and the second spherical center 141 are changed, specifically:

[0070] In this embodiment, the first spherical center 131 and the second spherical center 141 are located on different vertical lines (not marked in the figure).

[0071] Specifically, the setting angle of the second ceramic sheet 3 is rotated clockwise (or counterclockwise, not limited here) along the second spherical center by a certain angle. The horizontal plane a is parallel to the housing 1, and the projection of the first spherical center 131 on the horizontal plane a and the projection of the second spherical center 141 on the horizontal plane a are separated by a predetermined distance.

[0072] Other technical features and technical effects are consistent with those of the first embodiment and are not described in detail here. Figures 1 to 3 Explanation of the contents.

[0073] Please refer to Figure 7-Figure 8 , Figure 7 is a cross-sectional view of a fifth embodiment of the present invention, Figure 8 1 is a top view of the fifth embodiment of the present invention. The difference between the fifth embodiment and the first embodiment is that the space inside the housing 1 is changed, specifically:

[0074] In this embodiment, in addition to the first confined space 11 and the second confined space 12, a third confined space 17 is also included. The third confined space 17 is arranged inside the housing 1. A third ceramic sheet 5 is arranged on the third confined space 17 and is located on the surface of the third spherical space 18. The radius of the third spherical space 18 can be greater than, equal to, or less than the radius of the first confined space 11 (or the second confined space 12), which is not limited here. In the direction of ultrasonic focusing, the ultrasonic wave generated by the third ceramic sheet 5 passes through the third spherical center 181 of the third spherical space 18.

[0075] In this embodiment, when viewed from above, the first limiting space 11, the second limiting space 12, and the third limiting space 17 are disposed adjacent to each other.

[0076] Specifically, the first limiting space 11 and the second limiting space 12 are disposed adjacent to each other, and the third limiting space 17 is also disposed adjacent to the first limiting space 11 .

[0077] More specifically, please refer to Figure 8 In this embodiment, the first limiting space 11 is arranged inside the third limiting space 17, and the second limiting space 12 is arranged inside the first limiting space 11, which is equivalent to observing from the focusing direction of the ultrasonic wave at this time, and the second limiting space 12, the first limiting space 11 and the third limiting space 17 are equivalent to being in a circular ring structure and arranged in sequence.

[0078] Of course, the positional relationship between the first limiting space 11, the second limiting space 12, and the third limiting space 17 can also be that the first limiting space 11 is arranged inside the second limiting space 12, and the third limiting space 17 is arranged inside the first limiting space 11 (because only Figure 8 On the basis of , the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not shown in the figure). This is not limited here.

[0079] Please refer to Figure 7In this embodiment, the first spherical center 131, the second spherical center 141 and the third spherical center 181 are located on the same vertical line (not marked in the figure). The horizontal plane a is parallel to the housing 1, and the projection of the first spherical center 131 on the horizontal plane a, the projection of the second spherical center 141 on the horizontal plane a and the projection of the third spherical center 181 on the horizontal plane a are located at the same position.

[0080] On the premise that the first ceramic sheet 2 and the second ceramic sheet 3 generate the first focus 132 and the second focus 142 through the inverse piezoelectric effect, a voltage is applied to the third ceramic sheet 5 to cause it to emit ultrasonic waves in the direction of the third spherical center 181 until the third focus 182 is formed (in order to better represent the third focus 182, the position of the third focus 182 is set on the third spherical center 181).

[0081] Other technical features and technical effects are consistent with those of the first embodiment and are not described in detail here. Figures 1 to 3 Explanation of the contents.

[0082] Please refer to Fig. 9 , Fig. 9 1 is a top view of the sixth embodiment of the present invention. The difference between the sixth embodiment and the fifth embodiment is that the positions of the first limiting space 11, the second limiting space 12 and the third limiting space 17 are changed, specifically:

[0083] In this embodiment, the first limiting space 11 and the second limiting space 12 are adjacently arranged, and the third limiting space 17 is adjacently arranged to the first limiting space 11. Fig. 9 When viewed from above, the first limiting space 11 is located in one side space inside the shell 1 , the second limiting space 12 is located in the other side space inside the shell 1 , and the third limiting space 17 is arranged inside the first limiting space 11 .

[0084] Of course, the positional relationship between the first limiting space 11, the second limiting space 12, and the third limiting space 17 can also be that, when viewed from above, the third limiting space 17 is located in one side of the space inside the shell 1, the first limiting space 11 is located in the other side of the space inside the shell 1, and the second limiting space 12 is arranged inside the first limiting space 11 (because it is only in Fig. 9 On the basis of , the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not shown in the figure). This is not limited here.

[0085] Other technical features and technical effects are consistent with those of the fifth embodiment, and are not described in detail here. Figures 1 to 3 , Figure 7 , Figure 8 Explanation of the contents.

[0086] Please refer to Fig.10 , Fig.10 1 is a top view of the seventh embodiment of the present invention. The difference between the seventh embodiment and the fifth embodiment is that the positions of the first limiting space 11, the second limiting space 12 and the third limiting space 17 are changed, specifically:

[0087] In this embodiment, the first limiting space 11 and the second limiting space 12 are disposed adjacent to each other, and the third limiting space 17 and the second limiting space 12 are disposed adjacent to each other.

[0088] Please refer to Fig.10 When viewed from above, the second limiting space 12 is arranged inside the third limiting space 17 , and the first limiting space 11 is arranged inside the second limiting space 12 .

[0089] Of course, the positional relationship between the first limiting space 11, the second limiting space 12, and the third limiting space 17 can also be that the second limiting space 12 is arranged inside the first limiting space 11, and the third limiting space 17 is arranged inside the second limiting space 12 (because only Fig.10 On the basis of , the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not shown in the figure). This is not limited here.

[0090] Other technical features and technical effects are consistent with those of the fifth embodiment, and are not described in detail here. Figures 1 to 3 , Figure 7 , Figure 8 Explanation of the contents.

[0091] Please refer to Fig.11 , Fig.11 1 is a top view of the eighth embodiment of the present invention. The difference between the eighth embodiment and the seventh embodiment is that the positions of the first limiting space 11, the second limiting space 12 and the third limiting space 17 are changed, specifically:

[0092] In this embodiment, the first limiting space 11 and the second limiting space 12 are adjacently arranged, and the third limiting space 17 and the second limiting space 12 are adjacently arranged. Fig.11 When viewed from above, the first limiting space 11 is located in one side space inside the shell 1 , the second limiting space 12 is located in the other side space inside the shell 1 , and the third limiting space 17 is arranged inside the second limiting space 12 .

[0093] Of course, the positional relationship between the first limiting space 11, the second limiting space 12, and the third limiting space 17 can also be that, when viewed from above, the third limiting space 17 is located in one side of the space inside the shell 1, the second limiting space 12 is located in the other side of the space inside the shell 1, and the first limiting space 11 is arranged inside the second limiting space 12 (because it is only in Fig.11 On the basis of , the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not shown in the figure). This is not limited here.

[0094] Other technical features and technical effects are consistent with those of the seventh embodiment and are not described in detail here. Figures 1 to 3 , Figure 7 , Figure 8 , Fig.10 Explanation of the contents.

[0095] Please refer to Fig.12 , Fig.12 1 is a top view of the ninth embodiment of the present invention. The difference between the ninth embodiment and the fifth embodiment is that the positions of the first limiting space 11, the second limiting space 12 and the third limiting space 17 are changed, specifically:

[0096] In this embodiment, the first limiting space 11, the second limiting space 12, and the third limiting space 17 are arranged adjacent to each other.

[0097] For details, please refer to Fig.12 The second limiting space 12 and the third limiting space 17 are arranged adjacent to each other and are arranged together inside the first limiting space 11 .

[0098] Alternatively, the first limiting space 11 and the third limiting space 17 are arranged adjacent to each other and are arranged together inside the second limiting space 12 (since only Fig.12 On the basis of , the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not shown in the figure). This is not limited here.

[0099] Alternatively, the first limiting space 11 and the second limiting space 12 are arranged adjacent to each other and are arranged together inside the third limiting space 17 (since only Fig.12 On the basis of , the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not shown in the figure). This is not limited here.

[0100] Other technical features and technical effects are consistent with those of the fifth embodiment and are not described in detail here. Figures 1 to 3 , Figure 7 , Figure 8 Explanation of the contents.

[0101] Please refer to Fig.13 , Fig.13 1 is a top view of the tenth embodiment of the present invention. The difference between the tenth embodiment and the ninth embodiment is that the positions of the first limiting space 11, the second limiting space 12 and the third limiting space 17 are changed, specifically:

[0102] In this embodiment, the first limiting space 11, the second limiting space 12, and the third limiting space 17 are arranged adjacent to each other. Fig.13 When viewed from above, the first limiting space 11 is located in one side space inside the shell 1, the second limiting space 12 is located in the other side space inside the shell 1, and the first limiting space 11 and the second limiting space 12 are cooperatively arranged on the periphery of the third limiting space 17.

[0103] Other technical features and technical effects are consistent with those of the ninth embodiment, and are not described in detail here. Figures 1 to 3 , Figure 7 , Figure 8 , Fig.12 Explanation of the contents.

[0104] Please refer to Fig.14 , Fig.14 1 is a top view of the eleventh embodiment of the present invention. The difference between the eleventh embodiment and the ninth embodiment is that the positions of the first limiting space 11, the second limiting space 12 and the third limiting space 17 are changed, specifically:

[0105] In this embodiment, the first limiting space 11, the second limiting space 12, and the third limiting space 17 are arranged adjacent to each other. Fig.14 When viewed from above, the first limiting space 11 is located in the first part of the space inside the shell 1, the second limiting space 12 is located in the second part of the space inside the shell 1, and the third limiting space 17 is located in the remaining part of the space inside the shell 1.

[0106] Other technical features and technical effects are consistent with those of the ninth embodiment, and are not described in detail here. Figures 1 to 3 , Figure 7 , Figure 8 , Fig.12 Explanation of the contents.

[0107] Please refer to Fig.15 , Fig.15 1 is a top view of the twelfth embodiment of the present invention. The difference between the twelfth embodiment and the fifth embodiment is that the positions of the first limiting space 11, the second limiting space 12 and the third limiting space 17 are changed, specifically:

[0108] In this embodiment, the first limiting space 11 and the second limiting space 12 are arranged at intervals.

[0109] For details, please refer to Fig.15 The third limiting space 17 is arranged inside the second limiting space 12 , and the first limiting space 11 is arranged inside the third limiting space 17 .

[0110] Of course, the positional relationship between the first limiting space 11, the second limiting space 12, and the third limiting space 17 can also be that the third limiting space 17 is arranged inside the first limiting space 11, and the second limiting space 12 is arranged inside the third limiting space 17 (because only in Fig.15 On this basis, the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not drawn).

[0111] Other technical features and technical effects are consistent with those of the fifth embodiment and are not described in detail here. Figures 1 to 3 , Figure 7 , Figure 8 Explanation of the contents.

[0112] Please refer to Fig.16 , Fig.16 1 is a top view of the thirteenth embodiment of the present invention. The difference between the thirteenth embodiment and the twelfth embodiment is that the positions of the first limiting space 11, the second limiting space 12 and the third limiting space 17 are changed, specifically:

[0113] In this embodiment, please refer to Fig.16 The first limiting space 11 and the second limiting space 12 are arranged inside the third limiting space 17 at intervals.

[0114] Of course, the positional relationship between the first limiting space 11, the second limiting space 12, and the third limiting space 17 can also be that the first limiting space 11 and the third limiting space 17 are arranged inside the second limiting space 12 at intervals (because only in Fig.16 On this basis, the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not drawn).

[0115] Or the second limiting space 12 and the third limiting space 17 are arranged inside the first limiting space 11 at intervals (because only Fig.16 On this basis, the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not drawn).

[0116] Other technical features and technical effects are consistent with those of the twelfth embodiment, and are not described in detail here. Figures 1 to 3, Figure 7 , Figure 8 , Fig.15 Explanation of the contents.

[0117] Please refer to Fig.17 , Fig.17 14 is a top view of the fourteenth embodiment of the present invention. The difference between the fourteenth embodiment and the twelfth embodiment is that the positions of the first limiting space 11, the second limiting space 12 and the third limiting space 17 are changed, specifically:

[0118] In this embodiment, on the basis of the first limiting space 11 and the second limiting space 12 being arranged at intervals, please refer to Fig.17 The first limiting space 11 is located in one side space inside the shell 1 , the third limiting space 17 is located in the other side space inside the shell 1 , and the second limiting space 12 is arranged inside the third limiting space 17 .

[0119] Of course, the positional relationship between the first limiting space 11, the second limiting space 12, and the third limiting space 17 can also be that the second limiting space 12 is located in one side of the space inside the shell 1, the third limiting space 17 is located in the other side of the space inside the shell 1, and the first limiting space 11 is arranged inside the third limiting space 17 (because it is only in Fig.17 On the basis of , the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not shown in the figure). This is not limited here.

[0120] Other technical features and technical effects are consistent with those of the twelfth embodiment, and are not described in detail here. Figures 1 to 3 , Figure 7 , Figure 8 , Fig.15 Explanation of the contents.

[0121] Please refer to Fig.18 , Fig.18 1 is a top view of the fifteenth embodiment of the present invention. The difference between the fifteenth embodiment and the twelfth embodiment is that the positions of the first limiting space 11, the second limiting space 12 and the third limiting space 17 are changed, specifically:

[0122] In this embodiment, on the basis of the first limiting space 11 and the second limiting space 12 being arranged at intervals, please refer to Fig.18 The first limiting space 11 and the second limiting space 12 are arranged inside the housing 1 at intervals, and the third limiting space 17 is arranged inside the first limiting space 11.

[0123] Of course, the positional relationship between the first limiting space 11, the second limiting space 12, and the third limiting space 17 can also be that the first limiting space 11 and the second limiting space 12 are arranged inside the housing at intervals, and the third limiting space is arranged inside the second limiting space 12 (because only Fig.18 On the basis of , the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not shown in the figure). This is not limited here.

[0124] Or the first limiting space 11 and the third limiting space are arranged inside the housing at intervals, and the second limiting space 12 is arranged inside the third limiting space 17 (because only Fig.18 On the basis of , the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not shown in the figure). This is not limited here.

[0125] Or the first limiting space 11 and the third limiting space 17 are arranged inside the housing at intervals, and the second limiting space 12 is arranged inside the first limiting space 11 (because only Fig.18 On the basis of , the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not shown in the figure). This is not limited here.

[0126] Or the second limiting space 12 and the third limiting space 17 are arranged inside the housing at intervals, and the first limiting space 11 is arranged inside the second limiting space 12 (because only Fig.18 On the basis of , the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not shown in the figure). This is not limited here.

[0127] Or the second limiting space 12 and the third limiting space 17 are arranged inside the housing at intervals, and the first limiting space 11 is arranged inside the third limiting space 17 (because only Fig.18 On the basis of , the first limiting space 11, the second limiting space 12, and the third limiting space 17 are simply changed in position, so they are not shown in the figure). This is not limited here.

[0128] Other technical features and technical effects are consistent with those of the twelfth embodiment, and are not described in detail here. Figures 1 to 3 , Figure 7 , Figure 8 , Fig.15 Explanation of the contents.

[0129] Please refer to Fig.19 , Fig.191 is a top view of the sixteenth embodiment of the present invention. The difference between the sixteenth embodiment and the twelfth embodiment is that the positions of the first limiting space 11, the second limiting space 12 and the third limiting space 17 are changed, specifically:

[0130] In this embodiment, on the basis of the first limiting space 11 and the second limiting space 12 being spaced apart by a predetermined distance, the third limiting space 17 is spaced apart by a predetermined distance from the first limiting space 11 and the second limiting space 12, respectively. This is equivalent to the first limiting space 11, the second limiting space 12, and the third limiting space 17 being spaced apart from each other.

[0131] Other technical features and technical effects are consistent with those of the twelfth embodiment, and are not described in detail here. Figures 1 to 3 , Figure 7 , Figure 8 , Fig.15 Explanation of the contents.

[0132] Please refer to Fig. 20 , Fig. 20 17 is a cross-sectional view of the seventeenth embodiment of the present invention. The difference between the seventeenth embodiment and the fifth embodiment is that the positions of the first spherical center 131, the second spherical center 141 and the third spherical center 181 are changed, specifically:

[0133] After rotating the second ceramic sheet 3 counterclockwise (or clockwise, not limited here) along the second sphere center 141 for a certain angle, and rotating the third ceramic sheet 5 clockwise (or counterclockwise, not limited here) along the third sphere center 181 for a certain angle, the first sphere center 131, the second sphere center 141 and the third sphere center 181 are respectively located on different vertical lines (not marked in the figure).

[0134] This is equivalent to that on the horizontal plane a parallel to the shell 1 , the projection of the first spherical center 131 on the horizontal plane a, the projection of the second spherical center 141 on the horizontal plane a and the projection of the third spherical center 181 on the horizontal plane a are spaced apart by a predetermined distance.

[0135] Other technical features and technical effects are consistent with those of the fifth embodiment and are not described in detail here. Figures 1 to 3 , Figure 7 , Figure 8 Explanation of the contents.

[0136] Please refer to Fig.21 , Fig.21 18 is a cross-sectional view of the eighteenth embodiment of the present invention. The eighteenth embodiment differs from the fifth embodiment in that the positions of the first spherical center 131, the second spherical center 141 and the third spherical center 181 are changed, specifically:

[0137] The third ceramic sheet 5 is rotated clockwise (or counterclockwise, not limited here) along the third sphere center 181 by a certain angle. At this time, the first sphere center 131 and the second sphere center 141 are located on the same vertical line (not marked in the figure), and the third sphere center 181 is located on another vertical line (not marked in the figure).

[0138] This is equivalent to that on a horizontal plane a parallel to the shell 1, the projection of the first center 131 on the horizontal plane a and the projection of the second center 141 on the horizontal plane a are located at the same position, and the projection of the third center 181 on the horizontal plane a is respectively spaced a predetermined distance from the projection of the first center 131 on the horizontal plane a and the projection of the second center 141 on the horizontal plane a.

[0139] Other technical features and technical effects are consistent with those of the fifth embodiment, and are not described in detail here. Figures 1 to 3 , Figure 7 , Figure 8 Explanation of the contents.

Claims

1. A multi-focus ultrasonic transducer, characterized in that: include: A housing, a first ceramic sheet and a second ceramic sheet; A first limiting space and a second limiting space are provided inside the shell, the first ceramic sheet is provided on the first limiting space and is located on the surface of the first spherical space; the second ceramic sheet is provided on the second limiting space and is located on the surface of the second spherical space; the radius of the first spherical space is smaller than or larger than the radius of the second spherical space; In the direction of ultrasonic focusing, the ultrasonic wave generated by the first ceramic sheet passes through the first center of the first spherical space, and the ultrasonic wave generated by the second ceramic sheet passes through the second center of the second spherical space.

2. The multi-focus ultrasonic transducer according to claim 1, characterized in that: When viewed from above, the first limiting space and the second limiting space are arranged adjacent to each other.

3. The multi-focus ultrasonic transducer according to claim 2, characterized in that: The first limiting space is arranged inside the second limiting space, or the second limiting space is arranged inside the first limiting space.

4. The multi-focus ultrasonic transducer according to claim 2, characterized in that: The first limiting space is located in a space on one side of the interior of the shell, and the second limiting space is located in a space on the other side of the interior of the shell.

5. The multi-focus ultrasonic transducer according to claim 4, characterized in that: When viewed from above, a projection area of ​​the first limiting space on the horizontal plane is greater than, equal to, or smaller than a projection area of ​​the second limiting space on the horizontal plane.

6. The multi-focus ultrasonic transducer according to any one of claims 2 to 5, characterized in that: A first fixed structure and a second fixed structure are arranged inside the shell, the second fixed structure is respectively connected to the outer wall of the first fixed structure and the inner wall of the shell, the space inside the first fixed structure is defined as the first limiting space, and the space between the first fixed structure and the inner wall of the shell is defined as the second limiting space; the first ceramic sheet is arranged on the first fixed structure, and the second ceramic sheet is arranged on the second fixed structure.

7. The multi-focus ultrasonic transducer according to claim 1, characterized in that: When viewed from above, the first limiting space and the second limiting space are arranged at a predetermined distance from each other.

8. The multi-focus ultrasonic transducer according to claim 1, characterized in that: The first spherical center and the second spherical center are located on the same vertical line.

9. The multi-focus ultrasonic transducer according to claim 1, characterized in that: The first spherical center and the second spherical center are located on different vertical lines.

10. The multi-focus ultrasonic transducer according to claim 2 or 7, characterized in that: It also includes a third limiting space, the third limiting space is arranged inside the shell, and a third ceramic is arranged on the third limiting space and located on the surface of the third spherical space; In the direction of ultrasonic focusing, the ultrasonic wave generated by the third ceramic sheet passes through the third spherical center of the third spherical space.

11. The multi-focus ultrasonic transducer according to claim 10, characterized in that: When viewed from above, the first limiting space, the second limiting space, and the third limiting space are arranged adjacent to each other; or the first limiting space, the second limiting space, and the third limiting space are arranged adjacent to each other in pairs.

12. The multi-focus ultrasonic transducer according to claim 11, characterized in that: The second limiting space is arranged inside the third limiting space, and the first limiting space is arranged inside the second limiting space; Or the first limiting space is arranged inside the third limiting space, and the second limiting space is arranged inside the first limiting space; Or the first limiting space is arranged inside the second limiting space, and the third limiting space is arranged inside the first limiting space; or the second limiting space is arranged inside the first limiting space, and the third limiting space is arranged inside the second limiting space; Or the third limiting space is arranged inside the second limiting space, and the first limiting space is arranged inside the third limiting space; Or the third limiting space is arranged inside the first limiting space, and the second limiting space is arranged inside the third limiting space; or the second limiting space is adjacent to the third limiting space and is arranged inside the first limiting space; Or the first limiting space and the third limiting space are adjacent to each other and are arranged inside the second limiting space; or the first limiting space and the second limiting space are adjacent to each other and are arranged inside the third limiting space; or the first limiting space and the second limiting space are arranged inside the third limiting space at intervals; or the first limiting space and the third limiting space are arranged inside the second limiting space at intervals; Or the second limiting space and the third limiting space are arranged inside the first limiting space at intervals.

13. The multi-focus ultrasonic transducer according to claim 11, characterized in that: The first limiting space is located in a space on one side of the interior of the shell, the second limiting space is located in a space on the other side of the interior of the shell, and the third limiting space is arranged inside the first limiting space; Or the first limiting space is located in a space on one side of the interior of the shell, the second limiting space is located in a space on the other side of the interior of the shell, and the third limiting space is arranged inside the second limiting space; Or the third limiting space is located in one side space inside the shell, the first limiting space is located in the other side space inside the shell, and the second limiting space is arranged inside the first limiting space; Or the third limiting space is located in one side space inside the shell, the second limiting space is located in the other side space inside the shell, and the first limiting space is arranged inside the second limiting space; Or the first limiting space is located in a space on one side of the interior of the shell, the second limiting space is located in a space on the other side of the interior of the shell, and the first limiting space and the second limiting space are cooperatively arranged on the periphery of the third limiting space; The first limiting space is located in a space on one side of the interior of the shell, the third limiting space is located in a space on the other side of the interior of the shell, and the second limiting space is arranged inside the third limiting space; Or the second limiting space is located in a space on one side of the interior of the shell, the third limiting space is located in a space on the other side of the interior of the shell, and the first limiting space is arranged inside the third limiting space; Alternatively, the first limiting space is located in a first partial space inside the shell, the second limiting space is located in a second partial space inside the shell, and the third limiting space is located in the remaining partial space inside the shell.

14. The multi-focus ultrasonic transducer according to claim 11, characterized in that: The first limiting space and the second limiting space are arranged inside the housing at intervals, and the third limiting space is arranged inside the first limiting space; Or the first limiting space and the second limiting space are arranged inside the housing at intervals, and the third limiting space is arranged inside the second limiting space; Or the first limiting space and the third limiting space are arranged inside the housing at intervals, and the second limiting space is arranged inside the third limiting space; Or the first limiting space and the third limiting space are arranged inside the housing at intervals, and the second limiting space is arranged inside the first limiting space; or the second limiting space and the third limiting space are arranged inside the housing at intervals, and the first limiting space is arranged inside the second limiting space; Alternatively, the second limiting space and the third limiting space are arranged inside the housing at intervals, and the first limiting space is arranged inside the third limiting space.

15. The multi-focus ultrasonic transducer according to claim 10, characterized in that: The first limiting space, the second limiting space and the third limiting space are arranged in pairs.

16. The multi-focus ultrasonic transducer according to claim 10, characterized in that: The first spherical center, the second spherical center and the third spherical center are located on the same vertical line; Alternatively, the first spherical center, the second spherical center, and the third spherical center are respectively located on different vertical lines; Alternatively, among the first spherical center, the second spherical center, and the third spherical center, two of them are located on the same vertical straight line, and the remaining one is located on another vertical straight line.

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