Planar diaphragm device

Abstract

A planar diaphragm device comprises a diaphragm, an actuator and at least one damper. The vibrating diaphragm is provided with a first surface and a second surface which are opposite; the actuator comprises a piezoelectric element and a filling layer, the piezoelectric element and the filling layer are arranged on the first surface of the vibrating diaphragm, and the filling layer covers the piezoelectric element; the damper is arranged on the first surface and the second surface of the vibrating diaphragm or the surface, away from the vibrating diaphragm, of the filling layer. According to the plane vibrating diaphragm device, the sound pressure of sound generated by the vibrating diaphragm in different frequency intervals can be changed according to the number of the dampers and different arrangement positions of the dampers.

Description

Technical Field

[0001] This utility model relates to a planar diaphragm device, and more particularly to a planar diaphragm device with a damper. Background Technology

[0002] Compared to traditional dynamic loudspeakers, piezoelectric loudspeakers, which use a planar diaphragm as their main component, offer advantages in thinness and compactness, and are widely used in the loudspeaker industry. A piezoelectric diaphragm loudspeaker utilizes the piezoelectric effect of piezoelectric ceramic materials and the principle of the interconversion of electromechanical energy. This causes the piezoelectric ceramic material to bend and vibrate, resulting in mechanical vibrations on the attached planar diaphragm that correspond to the intensity and frequency of the audio signal, thus driving the air to produce sound. However, current piezoelectric loudspeakers exhibit inconsistent performance in the low-frequency and high-frequency ranges, preventing them from truly reproducing the original sound. Utility Model Content

[0003] This invention provides a planar diaphragm device that allows the sound pressure generated by the diaphragm to vary in different frequency ranges, in order to meet diverse product requirements.

[0004] The planar diaphragm device provided by the first aspect of this utility model includes a diaphragm, an actuator, and a damper. The diaphragm has a first surface and a second surface opposite to each other; the actuator includes a piezoelectric element and a filling layer, the piezoelectric element is disposed on the first surface of the diaphragm, and the filling layer is disposed on the first surface and covers the piezoelectric element; the damper is disposed on the second surface of the diaphragm.

[0005] The planar diaphragm device provided in the second aspect of this utility model includes a diaphragm, an actuator, and a damper. The diaphragm has a first surface and a second surface opposite to each other; the actuator includes a piezoelectric element and a filling layer, the piezoelectric element is disposed on the first surface of the diaphragm, and the filling layer is disposed on the first surface and covers the piezoelectric element; the damper is disposed on the first surface of the diaphragm.

[0006] The planar diaphragm device provided in the third aspect of this utility model includes a diaphragm, an actuator, and a damper. The diaphragm has a first surface and a second surface opposite to each other; the actuator includes a piezoelectric element and a filling layer, the piezoelectric element is disposed on the first surface of the diaphragm, and the filling layer is disposed on the first surface and covers the piezoelectric element; the damper is disposed on the surface of the filling layer away from the diaphragm.

[0007] In one embodiment of this utility model, the number of dampers is one, and the vertical projection of the damper on the first surface passes through the actuator.

[0008] In one embodiment of the present invention, the vertical projection of the damper on the first surface passes through the center of the actuator.

[0009] In one embodiment of this utility model, there are two piezoelectric elements, and the vertical projection of the damper on the first surface passes between the two piezoelectric elements.

[0010] In one embodiment of this utility model, there are multiple dampers, and the vertical projections of two of these dampers on the first surface pass through both sides of the actuator.

[0011] In one embodiment of the present invention, the planar diaphragm device further includes a frame, which is disposed on the first surface and houses the actuator within the frame.

[0012] In one embodiment of the present invention, the number of dampers is one, the number of piezoelectric elements is two, the damper passes between the two piezoelectric elements, and a portion of the damper is covered by a filling layer.

[0013] In one embodiment of this utility model, there are multiple dampers, and two of these dampers are respectively disposed on both sides of the actuator.

[0014] In one embodiment of the present invention, the number of dampers is one, and the damper is disposed at the center of the surface of the filling layer away from the diaphragm.

[0015] In one embodiment of the present invention, the damper has a damper length and a damper width extending along a first direction and a second direction, respectively; the diaphragm has a diaphragm transverse length and a diaphragm longitudinal length extending along the first direction and the second direction, respectively, wherein the damper length is less than or equal to the diaphragm transverse length.

[0016] In one embodiment of the present invention, the actuator has an actuation longitudinal length extending along a second direction, wherein the damper width is greater than or equal to 1 mm and less than 1 / 10 of the diaphragm longitudinal length.

[0017] In one embodiment of the present invention, the planar diaphragm device further includes a frame, which is disposed on the first surface and houses the actuator and damper within the frame.

[0018] This invention employs a damper fixed to the diaphragm and / or actuator. When the diaphragm vibrates due to the actuator's action, the sound pressure level of the emitted sound can vary to different degrees in different frequency ranges depending on the damper's placement, thus meeting diverse product requirements.

[0019] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a cross-sectional schematic diagram of a planar diaphragm device according to a first embodiment of the present invention.

[0021] Figure 2 This is a bottom view of the planar diaphragm device according to a first embodiment of the present invention.

[0022] Figure 3 This is a cross-sectional schematic diagram of the first embodiment of the planar diaphragm device of this utility model with different appearances.

[0023] Figure 4 This is a cross-sectional schematic diagram of a planar diaphragm device according to a second embodiment of the present invention.

[0024] Figure 5 This is a bottom view of the planar diaphragm device according to the third embodiment of this utility model.

[0025] Figure 6 This is a cross-sectional schematic diagram of the planar diaphragm device according to the fourth embodiment of this utility model.

[0026] Figure 7 This is a bottom view of the planar diaphragm device according to the fourth embodiment of this utility model.

[0027] Figure 8 This is a cross-sectional schematic diagram of the planar diaphragm device according to the fifth embodiment of this utility model.

[0028] Figure 9 This is a cross-sectional schematic diagram of the planar diaphragm device according to the sixth embodiment of this utility model.

[0029] Figure 10 This is a cross-sectional schematic diagram of the planar diaphragm device according to the seventh embodiment of this utility model.

[0030] Figure 11 This is a cross-sectional schematic diagram of the planar diaphragm device according to the eighth embodiment of this utility model. Detailed Implementation

[0031] Figure 1 This is a cross-sectional schematic diagram of a planar diaphragm device according to a first embodiment of the present invention; Figure 2 This is a bottom view schematic diagram of a planar diaphragm device according to a first embodiment of the present invention, wherein... Figure 1 The image shows along Figure 2A cross-sectional diagram of line segment AA'. (See diagram below.) Figure 1 and Figure 2 As shown, the planar diaphragm device 10 includes a diaphragm 22, an actuator 24, and a damper 26. The diaphragm 22 has a first surface 221 and a second surface 222 facing each other. The actuator 24 includes a piezoelectric element 241 and a filling layer 242. The piezoelectric element 241 is disposed on the first surface 221 of the diaphragm 22, and the filling layer 242 is disposed on the first surface 221 of the diaphragm 22 and covers the piezoelectric element 241. The damper 26 is disposed on the second surface 222 of the diaphragm 22.

[0032] In one embodiment, such as Figure 1 As shown, the number of piezoelectric elements 241 is, for example, two, and the two piezoelectric elements 241 are arranged side by side on the first surface 221. The vertical projection of the damper 26 disposed on the second surface 222 passes through the center of the actuator 24 on the first surface 221. Furthermore, the vertical projection of the damper 26 on the first surface 221 passes between the two piezoelectric elements 241 of the actuator 24.

[0033] Continuing from the above explanation, as Figure 2 As shown, the diaphragm 22 is, for example, rectangular, but not limited thereto. The diaphragm 22 has a lateral length L1 extending along a first direction D1 and a longitudinal length L2 extending along a second direction D2. The damper 26 is, for example, elongated, having a damper length L5 extending along the first direction D1 and a damper width L6 extending along the second direction D2. The damper length L5 is less than or equal to the lateral length L1 of the diaphragm. In another embodiment, the actuator 24 is also, for example, rectangular, but not limited thereto. The actuator 24 has an actuation longitudinal length L4 extending along the second direction D2, wherein the damper width L6 is greater than or equal to 1 mm and less than 1 / 10 of the longitudinal length L2 of the diaphragm.

[0034] In one embodiment, specifically, when the actuator 24 is positioned at the center of the first surface 221 of the diaphragm 22, the damper 26 is positioned at a location corresponding to half the longitudinal length L2 of the diaphragm, that is, the vertical projection of the damper 26 passes between the two piezoelectric elements 241. Thus, by providing the damper 26, the low-frequency portion (e.g., 1000Hz) of the sound pressure frequency response curve output by the actuator 24 exhibits a lower response compared to the case where the damper 26 is not placed.

[0035] Furthermore, in one embodiment, the number of piezoelectric elements 241 in the actuator 24 is not limited to two. Figure 3 This is a cross-sectional schematic diagram of the first embodiment of the planar diaphragm device of this utility model with different appearances, as shown below. Figure 3As shown, the number of piezoelectric elements 241 of the actuator 24 included in the planar diaphragm device 10' is, for example, a single one, and the damper 26 disposed on the second surface 222 has its vertical projection on the first surface 221 passing through the center of the single piezoelectric element 241.

[0036] Figure 4 This is a cross-sectional schematic diagram of a planar diaphragm device according to a second embodiment of the present invention. The difference between the planar diaphragm device 10A in the second embodiment and the planar diaphragm device 10 in the first embodiment is that the planar diaphragm device 10A has multiple dampers 26, such as... Figure 4 As shown, the number of dampers 26 is, for example, two. The two dampers 26 are arranged parallel to each other and spaced apart on the second surface 222 of the diaphragm 22, and the vertical projections of the two dampers 26 on the first surface 221 pass through the opposite sides of the actuator 24.

[0037] In one embodiment, two parallel and spaced dampers 26 extend along a first direction D1, and the two dampers 26 are respectively disposed at 1 / 4 of the longitudinal length L2 of the diaphragm from the opposite end edges of the diaphragm 22 (i.e., The position of L2). Thus, by setting the two dampers 26, the lowest frequency part of the sound pressure frequency response curve output by the actuator 24 (e.g., less than 500Hz) exhibits a higher response compared to the case without dampers 26; the mid-to-high frequency part of the sound pressure frequency response curve exhibits a lower response compared to the case without dampers 26.

[0038] In an embodiment not shown, the number of piezoelectric elements 241 of the actuator 24 may be, for example, two, and the number of dampers 26 disposed on the second surface 222 may be, for example, three, wherein the vertical projections of two dampers 26 on the first surface 221 pass through the two sides of the actuator 24 respectively, and the vertical projection of the other damper 26 on the first surface 221 passes between the two piezoelectric elements 241.

[0039] Figure 5 This is a bottom view schematic diagram of a planar diaphragm device according to a third embodiment of the present invention. The difference between the planar diaphragm device 10B of the third embodiment and the planar diaphragm device 10 of the first embodiment is that the planar diaphragm device 10B further includes a frame 28, which is framed on the first surface 221, and the actuator 24 is housed within the frame 28.

[0040] like Figures 1 to 5 As shown, in the planar diaphragm devices 10 / 10' / 10A / 10B of the first / second / third embodiments described above, the damper 26 and the actuator 24 are respectively disposed on different sides of the diaphragm 22, but are not limited thereto. Figure 6 This is a cross-sectional schematic diagram of the planar diaphragm device according to the fourth embodiment of this utility model. Figure 7This is a bottom view schematic diagram of the planar diaphragm device according to the fourth embodiment of this utility model, wherein... Figure 6 The image shows along Figure 7 A cross-sectional view of line segment BB'. (See diagram below.) Figure 6 and Figure 7 As shown, the planar diaphragm device 11 includes a diaphragm 22, an actuator 24, and a damper 26. The diaphragm 22 has opposing first surfaces 221 and second surfaces 222. The actuator 24 includes, for example, two piezoelectric elements 241 and a filler layer 242. In one embodiment, the two piezoelectric elements 241 are disposed on the first surface 221, and the filler layer 242 is disposed on the first surface 221 and covers the two piezoelectric elements 241. The damper 26 is disposed on the first surface 221 and passes between the two piezoelectric elements 241, and a portion of the damper 26 is covered by the filler layer 242. That is, in the fourth embodiment of the planar diaphragm device 11, the actuator 24 and the damper 26 are located on the same side of the diaphragm 22 (i.e., both are located on the first surface 221).

[0041] Continuing from the above explanation, as Figure 7 As shown, the planar diaphragm device 11 has a diaphragm 22 with a diaphragm lateral length L1 extending along a first direction D1; the damper 26 has a damper length L5 extending along the first direction D1, the damper length L5 being, for example, equal to the diaphragm lateral length L1, wherein, for example, the middle section of the damper 26 may be covered by a filler layer 242. In an embodiment not shown, the planar diaphragm device 11 may further include a frame 28 framed on the first surface 221, and the actuator 24 may be housed within the frame 28, wherein the damper length L5 may be, for example, less than the diaphragm lateral length L1 and housed within the frame 28, or the damper 26 may be integrally formed with the frame 28.

[0042] Figure 8 This is a cross-sectional schematic diagram of the planar diaphragm device according to the fifth embodiment of this utility model. The planar diaphragm device 12 of the fifth embodiment is similar to the planar diaphragm device 10A of the second embodiment (e.g., Figure 4 The difference (as shown) lies in the position of the damper 26. For example... Figure 8 As shown, there are multiple dampers 26, for example two, disposed on the first surface 221 of the diaphragm and located on opposite sides of the actuator 24. In another embodiment not shown, the number of dampers 26 may be, for example, three, with two dampers 26 disposed on opposite sides of the actuator 24, and the third damper 26 passing through the piezoelectric elements 241 and partially covered by the filler layer 242.

[0043] Figure 9This is a cross-sectional schematic diagram of a planar diaphragm device according to a sixth embodiment of the present invention. The difference between the planar diaphragm device 12A of the sixth embodiment and the planar diaphragm device 12 of the fifth embodiment is that the planar diaphragm device 12A further includes a frame 28, which is framed on the first surface 221 and houses the actuator 24 and the damper 26 within the frame 28.

[0044] like Figures 6 to 9 As shown, in the planar diaphragm device 11 / 12 / 12A of the fourth / fifth / sixth embodiments described above, the damper 26 and the actuator 24 are disposed on the same side of the diaphragm 22, and the damper 26 passes through the filling layer 242 of the actuator 24 and / or is located on opposite sides of the actuator 24, but is not limited thereto. Figure 10 This is a cross-sectional schematic diagram of the planar diaphragm device according to the seventh embodiment of this utility model, as shown below. Figure 10 As shown, the planar diaphragm device 13 includes a diaphragm 22, an actuator 24, and a damper 26. The diaphragm 22 has a first surface 221 and a second surface 222 facing each other. The actuator 24 includes a piezoelectric element 241 and a filler layer 242. The number of piezoelectric elements 241 may be, for example, two, disposed on the first surface 221. The filler layer 242 is disposed on the first surface 221 and covers the piezoelectric elements 242. The number of dampers 26 may be, for example, a single, disposed at the center of the surface of the filler layer 242 away from the diaphragm 22, and its vertical projection on the first surface 221 passes between the two piezoelectric elements 241, but is not limited to this. In an embodiment not shown, the number of piezoelectric elements 241 may be, for example, a single one, and the number of dampers 26 may be, for example, three, with two dampers 26 disposed on opposite sides of the actuator 24 and the other damper 26 disposed at the center of the surface of the filler layer 242 away from the diaphragm 22, and the vertical projection of the first surface 221 passes through the actuator 24 and the piezoelectric element 241.

[0045] Figure 11 This is a cross-sectional schematic diagram of the planar diaphragm device according to the eighth embodiment of the present invention. The difference between the planar diaphragm device 13A of the eighth embodiment and the planar diaphragm device 13 of the seventh embodiment is that the planar diaphragm device 13A further includes a frame 28, which is framed on the first surface 221 and the actuator 24 and the damper 26 are framed in the frame 28.

[0046] In the above embodiments, the diaphragm 22 may be composed of a single material, a composite material, or a panel assembly; the shape of the diaphragm 22 may be rectangular, square, circular, or free-form; the material of the damper 26 may be plant fiber composite material, metal, plastic, or a material suitable for fixing to the diaphragm 22, and the shape of the damper 26 is not limited to strip or line.

[0047] Based on the above, the planar diaphragm device of this utility model, by fixing a damper to the diaphragm and / or actuator, causes the diaphragm to vibrate due to the action of the actuator. Depending on the configuration position of the damper, the sound pressure of the emitted sound in different frequency ranges can be changed to different degrees to meet diverse product requirements.

[0048] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the methods and techniques disclosed above without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A planar diaphragm device, characterized in that, include: A diaphragm has a first surface and a second surface that are opposite to each other; An actuator includes at least one piezoelectric element and a filler layer. The at least one piezoelectric element is disposed on the first surface of the diaphragm, and the filler layer is disposed on the first surface and covers the at least one piezoelectric element. and At least one damper is disposed on the second surface of the diaphragm.

2. The planar diaphragm device as described in claim 1, characterized in that, The number of at least one damper is one, and the vertical projection of the damper on the first surface passes through the actuator.

3. The planar diaphragm device as described in claim 2, characterized in that, The damper's vertical projection on the first surface passes through the center of the actuator.

4. The planar diaphragm device as described in claim 2, characterized in that, The number of at least one piezoelectric element is two, and the vertical projection of the damper on the first surface passes between the two piezoelectric elements.

5. The planar diaphragm device as described in claim 1, characterized in that, The number of at least one damper is multiple, and the vertical projection of two of the dampers on the first surface passes through both sides of the actuator.

6. The planar diaphragm device as described in claim 1, characterized in that, The at least one damper has a damper length and a damper width extending along a first direction and a second direction, respectively, and the diaphragm has a diaphragm lateral length and a diaphragm longitudinal length extending along the first direction and the second direction, respectively, wherein the damper length is less than or equal to the diaphragm lateral length.

7. The planar diaphragm device as described in claim 6, characterized in that, The actuator has a co-dynamic longitudinal length extending along the second direction, wherein the damper width is greater than or equal to 1 mm and less than 1 / 10 of the diaphragm longitudinal length.

8. The planar diaphragm device as described in claim 1, characterized in that, The planar diaphragm device further includes a frame disposed on the first surface, and the actuator is housed within the frame.

9. A planar diaphragm device, characterized in that, include: A diaphragm has a first surface and a second surface that are opposite to each other; An actuator includes at least one piezoelectric element and a filler layer. The at least one piezoelectric element is disposed on the first surface of the diaphragm, and the filler layer is disposed on the first surface and covers the at least one piezoelectric element. and At least one damper is disposed on the first surface of the diaphragm.

10. The planar diaphragm device as described in claim 9, characterized in that, The number of at least one damper is one, the number of at least one piezoelectric element is two, the damper passes between the two piezoelectric elements, and a portion of the damper is covered by the filling layer.

11. The planar diaphragm device as described in claim 9, characterized in that, The number of at least one damper is multiple, and two of the dampers are respectively disposed on both sides of the actuator.

12. The planar diaphragm device as described in claim 9, characterized in that, The at least one damper has a damper length and a damper width extending along a first direction and a second direction, respectively. The diaphragm has a diaphragm lateral length and a diaphragm longitudinal length extending along the first direction and the second direction, respectively. The damper length is greater than the lateral length of the actuator and less than or equal to the lateral length of the diaphragm.

13. The planar diaphragm device as described in claim 12, characterized in that, The actuator has a co-dynamic longitudinal length extending along the second direction, wherein the damper width is greater than or equal to 1 mm and less than 1 / 10 of the diaphragm longitudinal length.

14. The planar diaphragm device as described in claim 9, characterized in that, The planar diaphragm device further includes a frame disposed on the first surface, and the actuator and the at least one damper are housed within the frame.

15. A planar diaphragm device, characterized in that, include: A diaphragm has a first surface and a second surface that are opposite to each other; An actuator, comprising at least one piezoelectric element and a filler layer, wherein the at least one piezoelectric element is disposed on the first surface of the diaphragm, and the filler layer is disposed on the first surface and covers the at least one piezoelectric element; and At least one damper is disposed on a surface of the filler layer away from the diaphragm.

16. The planar diaphragm device as described in claim 15, characterized in that, The number of at least one damper is one, and the damper is disposed at the center of the surface of the filling layer away from the diaphragm.

17. The planar diaphragm device as described in claim 16, characterized in that, The number of at least one piezoelectric element is two, and the vertical projection of the damper on the first surface passes between the two piezoelectric elements.

18. The planar diaphragm device as described in claim 15, characterized in that, The at least one damper has a damper length and a damper width extending along a first direction and a second direction, respectively; the diaphragm has a diaphragm lateral length and a diaphragm longitudinal length extending along the first direction and the second direction, respectively; the actuator has an actuator longitudinal length extending along the second direction, wherein the damper length is less than or equal to the diaphragm lateral length, and the damper width is greater than or equal to 1 mm and less than 1 / 10 of the diaphragm longitudinal length.

19. The planar diaphragm device as described in claim 15, characterized in that, The planar diaphragm device further includes a frame disposed on the first surface, and the actuator and the at least one damper are housed within the frame.

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