Vibration unit and electronic device

Abstract

The invention provides a vibration unit and electronic equipment. The vibration unit comprises a piezoelectric plate, an elastic sheet and a display screen, and the display screen is connected with one side of the piezoelectric plate; the elastic piece comprises a deformation part and a hollow part, the deformation part is provided with a first end close to the hollow part and a second end away from the hollow part, and the first end is connected with the side, away from the display screen, of the piezoelectric piece; and the second end is bent towards the display screen, or the second end is bent towards a direction deviating from the display screen. The vibration effect of the vibration unit can be enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of sound-generating devices, and more specifically, to a vibration unit and an electronic device. Background Art

[0002] In the prior art, sports watches are usually equipped with a vibration unit to achieve a higher level of dust and water resistance, so that the screen can make sounds through vibration. However, the current vibration unit usually uses a bimorph piezoelectric sheet to vibrate, and the middle layer in the bimorph piezoelectric sheet is prone to internal energy loss, resulting in poor vibration effect of the vibration unit.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

[0004] An object of the present invention is to provide a new technical solution for a vibration unit and an electronic device.

[0005] According to a first aspect of the present invention, a vibration unit is provided, wherein the vibration unit comprises:

[0006] A piezoelectric sheet, a spring sheet and a display screen, wherein the display screen is connected to one side of the piezoelectric sheet; the spring sheet includes a deformation portion and a hollow portion, the deformation portion has a first end close to the hollow portion and a second end away from the hollow portion, the first end is connected to a side of the piezoelectric sheet away from the display screen; the second end is bent toward the display screen, or the second end is bent in a direction away from the display screen.

[0007] Optionally, the spring piece is made of nickel alloy.

[0008] Optionally, the piezoelectric film is a single crystal piezoelectric film.

[0009] Optionally, it further includes a first adhesive, and the first end is connected to the piezoelectric sheet through the first adhesive;

[0010] Wherein, the Shore D hardness of the first adhesive is less than 90 degrees.

[0011] Optionally, a second adhesive is further included, and the display screen is connected to the piezoelectric sheet via the second adhesive;

[0012] Wherein, the Shore A hardness of the second adhesive is less than 90 degrees.

[0013] Optionally, an orthographic projection of the piezoelectric sheet onto the display screen is larger than an orthographic projection of the second adhesive onto the display screen.

[0014] Optionally, an orthographic projection of the hollow portion onto the display screen is larger than an orthographic projection of the second adhesive onto the display screen.

[0015] Optionally, it further comprises a lens and a third adhesive, wherein the lens is connected to a side of the display screen away from the piezoelectric sheet through the third adhesive;

[0016] Wherein, the third adhesive is optical glue.

[0017] Optionally, it further comprises a shell and a fourth adhesive, wherein the shell is connected to the peripheral side of the lens through the fourth adhesive;

[0018] Wherein, the Shore A hardness of the fourth adhesive is less than 90 degrees.

[0019] According to a second aspect of the present invention, there is provided an electronic device, comprising a vibration unit as described in any one of the first aspects.

[0020] The vibration unit in the embodiment of the present application is configured such that a spring sheet having a deformation portion and a hollow portion is arranged on the side of the piezoelectric sheet away from the display screen, and the second end of the deformation portion is bent toward the display screen or bent in a direction away from the display screen. When the piezoelectric sheet vibrates, the spring sheet can further enhance the vibration intensity of the piezoelectric sheet, thereby effectively enhancing the vibration effect of the vibration unit.

[0021] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0023] Figure 1 is a partial cross-sectional view of a vibration unit in one embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of the partial structure of a vibration unit in one embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Piezoelectric film;

[0027] 2. spring piece; 201. deformation part; 2011. first end; 2012. second end; 202. hollow part;

[0028] 3. A first adhesive;

[0029] 4. Display screen;

[0030] 5. Second adhesive;

[0031] 6. Lenses;

[0032] 7. The third adhesive;

[0033] 8. Shell;

[0034] 9. Fourth adhesive. DETAILED DESCRIPTION

[0035] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0036] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0037] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0038] According to one embodiment of the present application, a vibration unit is provided, which includes a piezoelectric sheet 1, a spring 2 and a display screen 4, wherein the display screen 4 is connected to one side of the piezoelectric sheet 1; the spring 2 includes a deformation portion 201 and a hollow portion 202, the deformation portion 201 has a first end 2011 close to the hollow portion 202 and a second end 2012 away from the hollow portion 202, the first end 2011 is connected to a side of the piezoelectric sheet 1 away from the display screen 4; the second end 2012 is bent toward the display screen 4, or the second end 2012 is bent in a direction away from the display screen 4.

[0039] Specifically, the piezoelectric sheet 1 described in the embodiment of the present application may be a bimorph piezoelectric sheet, which refers to a vibration component formed by connecting two layers of PZT (PbZrxTi1-xO3, lead zirconate titanate) through an intermediate insulating layer. The bimorph piezoelectric sheet can produce mechanical deformation when voltage is applied. For example, when an AC voltage is applied to the bimorph piezoelectric sheet, the bimorph piezoelectric sheet can vibrate with considerable force, and these vibrations can drive the display screen 4 to generate sound waves or tactile feedback. However, the bimorph piezoelectric sheet connects two layers of PZT through an insulating layer arranged in the middle, resulting in that when the bimorph piezoelectric sheet vibrates, the insulating layer in the middle absorbs part of the vibration and generates internal energy loss, so that the vibration energy transmitted from the piezoelectric sheet 1 to the display screen 4 is small, thereby seriously affecting the vibration effect of the vibration unit.

[0040] For this reason, Figure 1 and Figure 2 As shown, in the embodiment of the present application, a spring piece 2 is arranged on the side of the piezoelectric sheet 1 away from the display screen 4, and the spring piece 2 is a disc structure, the peripheral side of the disc structure forms a deformation portion 201 of the spring piece 2, and the middle part of the disc structure forms a hollow portion 202 of the spring piece 2. The deformation portion 201 has a first end 2011 close to the hollow portion 202 and a second end 2012 away from the hollow portion 202. The first end 2011 is the connection portion of the spring piece 2, which is used to connect with the side of the piezoelectric sheet 1 away from the display screen 4, so that after a voltage is applied to the piezoelectric sheet 1, the spring piece 2 can vibrate together with the piezoelectric sheet 1. The second end 2012 is the vibration part of the spring 2. After the first end 2011 is connected to the piezoelectric sheet 1, the second end 2012 is in a suspended state and is bent toward the display screen 4, so that after the piezoelectric sheet 1 vibrates, the second end 2012 bent toward the display screen 4 and in a suspended state can make the piezoelectric sheet 1 vibrate with greater intensity, thereby not only offsetting the vibration absorbed by the middle insulating layer of the bimorph piezoelectric sheet, but also further enhancing the vibration effect of the piezoelectric sheet 1.

[0041] Thus, the present application effectively avoids the problem that the vibration effect of the vibration unit is poor due to the insulating layer in the bimorph piezoelectric sheet by enhancing the vibration effect of the piezoelectric sheet 1 through the second end 2012 of the spring 2. In addition, since the spring 2 is also connected to the piezoelectric sheet 1 through the first end 2011, the spring 2 of the present application can further enhance the structural rigidity of the piezoelectric sheet 1, thereby greatly improving the service life and reliability of the vibration unit.

[0042] In addition, the second end 2012 of the spring 2 described in the embodiment of the present application can also be bent in the direction away from the display screen 4, that is, the second end 2012 bent in the direction away from the display screen 4 and in a suspended state can also make the piezoelectric film 1 produce stronger vibration, thereby not only offsetting the vibration absorbed by the middle insulating layer of the bimorph piezoelectric film, but also further enhancing the vibration effect of the piezoelectric film 1.

[0043] In one embodiment, the elastic sheet 2 is made of nickel alloy.

[0044] Specifically, since the piezoelectric sheet 1 is easily affected by environmental factors such as temperature and humidity during use, in order to better ensure the service life and reliability of the piezoelectric sheet 1, it is preferred to use a material with properties similar to those of PZT to prepare the spring piece 2.

[0045] For example, the material of the spring piece 2 may include at least one of nickel alloy, barium titanate, potassium sodium niobate, sodium bismuth titanate, bismuth ferrite and doped aluminum nitride.

[0046] Among them, since nickel alloy can achieve the best balance between strength and toughness through composition design and heat treatment, and nickel alloy has excellent corrosion resistance and oxidation resistance, the present application sets the material of the spring piece 2 to nickel alloy, which not only effectively improves the service life and reliability of the vibration unit, but also makes the vibration amplitude, vibration frequency and vibration reliability of the second end 2012 better, thereby further enhancing the vibration effect of the piezoelectric piece 1.

[0047] In one embodiment, the piezoelectric film 1 is a single crystal piezoelectric film.

[0048] Specifically, since the piezoelectric sheet 1 described in the present application is provided with a spring 2 on the side facing away from the display screen 4, and the spring 2 is connected to the piezoelectric sheet 1 through the first end 2011 to form a whole, thereby enhancing the structural rigidity of the piezoelectric sheet 1, the present application can also set the piezoelectric sheet 1 as a single crystal piezoelectric sheet on the basis of ensuring the structural rigidity of the piezoelectric sheet 1. Among them, by setting the piezoelectric sheet 1 as a single crystal piezoelectric sheet, the present application not only avoids the problem that the vibration effect of the vibration unit is poor due to the insulating layer in the bicrystalline piezoelectric sheet, but also enhances the vibration effect of the piezoelectric sheet 1 through the spring 2, so that the vibration unit prepared by the single crystal piezoelectric sheet can achieve the vibration effect produced by the vibration unit prepared by the bicrystalline piezoelectric sheet, and achieves the situation that the middle layer of the bicrystalline piezoelectric sheet does not generate energy internal loss, thereby effectively meeting the vibration requirements of the vibration unit.

[0049] In addition, compared with bicrystalline piezoelectric sheets, single-crystal piezoelectric sheets have stronger piezoelectric performance, better electrical and mechanical properties, simpler structure and lower cost. Therefore, the present application further improves the use effect of the vibration unit, simplifies the structure of the vibration unit, and reduces the manufacturing cost of the vibration unit by setting the piezoelectric sheet 1 as a single-crystal piezoelectric sheet.

[0050] In one embodiment, the vibration unit further includes a first adhesive 3, and the first end 2011 is connected to the piezoelectric sheet 1 via the first adhesive 3; wherein the Shore D hardness of the first adhesive 3 is less than 90 degrees.

[0051] Specifically, Figure 1 and Figure 2As shown, in the embodiment of the present application, the first end 2011 can be connected to the side of the piezoelectric sheet 1 facing away from the display screen 4 through the first adhesive 3, that is, the present application can connect the spring piece 2 and the piezoelectric sheet 1 into a whole through the first adhesive 3, so that after the voltage is applied to the piezoelectric sheet 1, the spring piece 2 can vibrate together with the piezoelectric sheet 1, thereby effectively ensuring the vibration effect of the spring piece 2 and the piezoelectric sheet 1.

[0052] In addition, in order to further ensure that the spring piece 2 can vibrate together with the piezoelectric sheet 1 , it is preferred that the Shore D hardness of the first adhesive 3 is less than 90 degrees.

[0053] For example, the first adhesive 3 may be at least one of epoxy resin glue, structural glue, instant glue or anaerobic glue.

[0054] In one embodiment, the vibration unit further includes a second adhesive 5, and the display screen 4 is connected to the piezoelectric sheet 1 via the second adhesive 5; wherein the Shore A hardness of the second adhesive 5 is less than 90 degrees.

[0055] Specifically, Figure 1 and Figure 2 As shown, the display screen 4 in the embodiment of the present application can be connected to one side of the piezoelectric sheet 1 through the second adhesive 5, that is, the present application can connect the display screen 4 and the piezoelectric sheet 1 into a whole through the second adhesive 5, so that after voltage is applied to the piezoelectric sheet 1, the piezoelectric sheet 1 vibrates and can drive the display screen 4 to generate sound waves or tactile feedback, thereby effectively ensuring the vibration effect of the display screen 4.

[0056] In addition, in order to further ensure that the display screen 4 can generate sound waves or tactile feedback, it is preferred that the Shore A hardness of the second adhesive 5 is less than 90 degrees.

[0057] For example, the second adhesive 5 can be at least one of silicone glue, polyurethane glue, pressure-sensitive adhesive or hot-melt adhesive.

[0058] In one embodiment, the orthographic projection of the piezoelectric sheet 1 onto the display screen 4 is larger than the orthographic projection of the second adhesive 5 onto the display screen 4 .

[0059] Specifically, Figure 1 and Figure 2As shown, the piezoelectric sheet 1 described in the embodiment of the present application can be provided with the second adhesive 5 only in the middle part of the piezoelectric sheet 1, so that the orthographic projection of the piezoelectric sheet 1 toward the display screen 4 is larger than the orthographic projection of the second adhesive 5 toward the display screen 4, so that after the display screen 4 is connected to the piezoelectric sheet 1, the area between the display screen 4 and the piezoelectric sheet 1 where the second adhesive 5 is not provided can form a vibration area with a certain height difference.

[0060] Thus, after voltage is applied to the piezoelectric sheet 1, the piezoelectric sheet 1 can release more degrees of freedom in the vibration area, that is, the piezoelectric sheet 1 can produce deformation vibrations with higher precision and a larger range in the vibration area, so that the piezoelectric sheet 1 can better drive the display screen 4 to generate sound waves of different frequencies or tactile feedback of different vibration amplitudes.

[0061] In one embodiment, the orthographic projection of the hollow portion 202 onto the display screen 4 is larger than the orthographic projection of the second adhesive 5 onto the display screen 4 .

[0062] Specifically, Figure 1 and Figure 2 As shown, the piezoelectric sheet 1 described in the embodiment of the present application can be provided with the second adhesive 5 only in the middle portion of the piezoelectric sheet 1 , so that the orthographic projection of the hollow portion 202 toward the display screen 4 is larger than the orthographic projection of the second adhesive 5 toward the display screen 4 .

[0063] Therefore, since the spring piece 2 has the hollow portion 202, after the voltage is applied to the piezoelectric sheet 1, the piezoelectric sheet 1 corresponding to the hollow portion 202 can release more degrees of freedom, that is, the piezoelectric sheet 1 corresponding to the hollow portion 202 can produce deformation vibration with higher precision and a larger range in the hollow portion 202, so that the piezoelectric sheet 1 can better drive the display screen 4 to generate sound waves of different frequencies or tactile feedback of different vibration amplitudes.

[0064] In one embodiment, the vibration unit further includes a lens 6 and a third adhesive 7, and the lens 6 is connected to a side of the display screen 4 away from the piezoelectric sheet 1 through the third adhesive 7; wherein the third adhesive 7 is optical glue.

[0065] Specifically, Figure 2 As shown, the vibration unit described in the embodiment of the present application further includes a lens 6, and the lens 6 is arranged on a side of the display screen 4 away from the piezoelectric sheet 1 to protect the display screen 4 and prevent external impurities from interfering with the vibration of the display screen 4.

[0066] The vibration unit also includes a third adhesive 7, and the lens 6 can be connected to the side of the display screen 4 facing away from the piezoelectric sheet 1 through the third adhesive 7, that is, the present application can connect the lens 6 and the display screen 4 into a whole through the third adhesive 7, so that after the piezoelectric sheet 1 applies voltage, the sound waves or tactile feedback generated by the piezoelectric sheet 1 driving the display screen 4 can be better output.

[0067] In addition, in order to further improve the output effect of the sound waves or tactile feedback generated by the piezoelectric sheet 1 driving the display screen 4, the third adhesive 7 is preferably optical glue.

[0068] For example, the third adhesive 7 may be at least one of unsaturated polyester resin, epoxy adhesive, polyurethane adhesive, silicone gel or OCA (Optically Clear Adhesive).

[0069] In one embodiment, the vibration unit further includes a shell 8 and a fourth adhesive 9, and the shell 8 is connected to the peripheral side of the lens 6 through the fourth adhesive 9; wherein the Shore A hardness of the fourth adhesive 9 is less than 90 degrees.

[0070] Specifically, Figure 2 As shown, the vibration unit of the embodiment of the present application also includes a shell 8, and the shell 8 has a certain rigidity and lightness to ensure that the vibration unit can respond quickly and provide clear and accurate sound quality when vibrating. The material of the shell 8 includes at least one of aluminum alloy, titanium alloy, magnesium alloy, ABS (Acrylonitrile Butadiene Styrene), nylon, carbon fiber and special ceramics to ensure the frequency response, damping characteristics of the vibration unit, and the overall sound effect of the electronic device.

[0071] The vibration unit also includes a fourth adhesive 9, and the shell 8 can be connected to the peripheral side of the lens 6 through the fourth adhesive 9, that is, the present application can connect the shell 8 and the lens 6 into a whole through the fourth adhesive 9, so that after the voltage is applied to the piezoelectric sheet 1, the piezoelectric sheet 1 can release more degrees of freedom, thereby better outputting the vibration generated by the piezoelectric sheet 1 to the display screen 4.

[0072] In addition, in order to further improve the degree of freedom of release of the piezoelectric sheet 1 , it is preferred that the Shore A hardness of the fourth adhesive 9 is less than 90 degrees.

[0073] For example, the fourth adhesive 9 may be at least one of silicone glue, polyurethane glue, pressure-sensitive adhesive or hot-melt adhesive.

[0074] According to another embodiment of the present application, an electronic device is provided, wherein the electronic device includes the vibration unit described in the embodiment of the present application.

[0075] Specifically, the vibration unit described in the embodiment of the present application can be applied to wearable electronic devices such as smart watches, smart glasses or smart bracelets, as well as other electronic devices such as mobile phones, tablet computers, virtual reality terminal devices, augmented reality terminal devices, drones, radars and vehicle-mounted devices. Those skilled in the art can make a choice according to actual needs, and this application does not make any specific restrictions here.

[0076] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0077] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A vibration unit, characterized in that: include: A piezoelectric sheet (1), a spring sheet (2) and a display screen (4), wherein the display screen (4) is connected to one side of the piezoelectric sheet (1); the spring sheet (2) comprises a deformation portion (201) and a hollow portion (202); the deformation portion (201) has a first end (2011) close to the hollow portion (202) and a second end (2012) away from the hollow portion (202); the first end (2011) is connected to a side of the piezoelectric sheet (1) away from the display screen (4); the second end (2012) is bent toward the display screen (4), or the second end (2012) is bent in a direction away from the display screen (4).

2. The vibration unit according to claim 1, characterized in that The material of the spring piece (2) is nickel alloy.

3. The vibration unit according to claim 1, characterized in that: The piezoelectric sheet (1) is a single crystal piezoelectric sheet.

4. The vibration unit according to claim 1, characterized in that: It also includes a first adhesive (3), and the first end (2011) is connected to the piezoelectric sheet (1) via the first adhesive (3); Wherein, the first adhesive (3) has a Shore D hardness of less than 90 degrees.

5. The vibration unit according to claim 1, characterized in that: It also includes a second adhesive (5), and the display screen (4) is connected to the piezoelectric sheet (1) via the second adhesive (5); Wherein, the Shore A hardness of the second adhesive (5) is less than 90 degrees.

6. The vibration unit according to claim 5, characterized in that The orthographic projection of the piezoelectric sheet (1) onto the display screen (4) is larger than the orthographic projection of the second adhesive (5) onto the display screen (4).

7. The vibration unit according to claim 5, characterized in that: The orthographic projection of the hollow portion (202) onto the display screen (4) is larger than the orthographic projection of the second adhesive (5) onto the display screen (4).

8. The vibration unit according to claim 1, characterized in that: It also includes a lens (6) and a third adhesive (7), wherein the lens (6) is connected to a side of the display screen (4) facing away from the piezoelectric sheet (1) via the third adhesive (7); Wherein, the third adhesive (7) is optical glue.

9. The vibration unit according to claim 8, characterized in that: It also includes a shell (8) and a fourth adhesive (9), wherein the shell (8) is connected to the peripheral side of the lens (6) via the fourth adhesive (9); Wherein, the fourth adhesive (9) has a Shore A hardness of less than 90 degrees.

10. An electronic device, characterized in that: Comprising a vibration unit as described in any one of claims 1-9.

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