Under-screen ultrasonic directional audio system

Abstract

The utility model relates to ultrasonic directional sound emission technology field discloses a kind of under-screen ultrasonic directional audio system, the audio system includes the following structure arrangement: soft membrane;Several piezoelectric sheets, it is independently set on the soft membrane respectively;And FPC board, it is electrically connected with the anode of all piezoelectric sheets;The audio system further includes or does not include several baffles, the baffle is used to block the vibration wave generated when the piezoelectric sheet vibrates;Wherein, if the baffle is included, then several baffles are independently set on the soft membrane and located between adjacent piezoelectric sheet;If the baffle is not included, then the interval of adjacent piezoelectric sheet is set as D, and satisfy D=λ, λ represents the wavelength of the vibration wave generated by piezoelectric sheet.The under-screen ultrasonic directional audio system of the utility model can be used in narrow space, directional propagation of sound can be realized, and the problem of difficulty in realizing directional sound emission function on current mobile phone is solved.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic directional sound generation technology, specifically to an under-screen ultrasonic directional audio system. Background Technology

[0002] In general, when making a phone call in a relatively enclosed and quiet space, even without turning on the phone's speakerphone (not using speakerphone), people who are close by can hear what others are saying, which seriously affects personal privacy.

[0003] Currently, most products on the market have directional sound generation functions designed for larger sound-producing devices such as televisions and stereos. However, achieving directional sound generation on mobile phones requires higher standards, as the limited space in mobile phones makes it difficult and costly to implement. Utility Model Content

[0004] The purpose of this invention is to provide an under-screen ultrasonic directional audio system, which aims to solve the current problem of difficulty in realizing directional sound function in mobile phones.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] This invention designs a sub-screen ultrasonic directional audio system, which includes the following structural configuration:

[0007] Soft film (i.e., mobile phone soft screen);

[0008] Several piezoelectric elements are independently disposed on the soft film;

[0009] And the FPC board, which is electrically connected to the positive electrode of all the piezoelectric elements;

[0010] The audio system may or may not include several baffles, which are used to block the vibration waves generated when the piezoelectric sheet vibrates;

[0011] If the audio system includes the baffles, then several baffles are independently disposed on the soft membrane and located between adjacent piezoelectric sheets.

[0012] If the audio system does not include the baffle, the spacing between adjacent piezoelectric sheets is set to D, and D = λ, where λ represents the wavelength of the vibration wave generated by the piezoelectric sheet (wavelength = wave speed / frequency, i.e., λ = v / f, where v represents the propagation speed (m / s) of the vibration wave generated by the piezoelectric sheet in the medium (soft film), and f represents the resonant frequency (Hz) of the piezoelectric sheet).

[0013] Specifically, FPC board refers to flexible circuit board, which is generally a flexible printed circuit board made of polyimide or polyester film as the substrate.

[0014] Furthermore, an under-screen ultrasonic directional audio system: the piezoelectric sheet is configured as a piezoelectric ceramic sheet with a coplanar electrode structure.

[0015] Furthermore, an under-screen ultrasonic directional audio system: several piezoelectric sheets are arranged in a honeycomb or matrix pattern on the soft membrane.

[0016] Furthermore, an under-screen ultrasonic directional audio system: several piezoelectric sheets are individually and independently bonded to the PVC film using adhesive.

[0017] Furthermore, an under-screen ultrasonic directional audio system: the FPC board is connected to the positive electrode of the piezoelectric sheet via conductive adhesive.

[0018] Furthermore, in an under-screen ultrasonic directional audio system, the number of piezoelectric elements is set to 16 to 512.

[0019] Furthermore, an under-screen ultrasonic directional audio system: several of the aforementioned baffles are individually and independently bonded to the PVC membrane using adhesive.

[0020] The beneficial effects of this utility model are:

[0021] This invention relates to an under-screen ultrasonic directional audio system that can be used in confined spaces (such as mobile phones) to achieve directional sound propagation, thus solving the current problem of difficulty in achieving directional sound generation on mobile phones.

[0022] This invention relates to an under-screen ultrasonic directional audio system that independently sets up several piezoelectric elements to form individual units that emit sound wave signals. This allows for the replacement of individual piezoelectric elements, facilitating subsequent use and maintenance, and reducing manufacturing and maintenance costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the structure of this under-screen ultrasonic directional audio system designed for Embodiment 1 of this utility model;

[0025] Figure 2 A cross-sectional view of the under-screen ultrasonic directional audio system designed for Example 1 is shown below. Figure 1 Cross-sectional view along the AA direction;

[0026] Figure 3 This is a schematic diagram of the structure of the under-screen ultrasonic directional audio system designed for Embodiment 2 of this utility model.

[0027] The markings in the image are as follows:

[0028] 1- Soft film, 2- Piezoelectric sheet, 3- FPC board, 4- Baffle. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0030] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicating orientation or positional relationships, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein.

[0031] Example 1

[0032] like Figures 1-2 As shown in Embodiment 1, a screen-mounted ultrasonic directional audio system is designed, which includes the following structural configuration:

[0033] Soft film (i.e., mobile phone soft screen) 1;

[0034] Several piezoelectric elements 2 are independently disposed on the soft film 1;

[0035] And FPC board 3, which is electrically connected to the positive electrode of all piezoelectric sheets 2;

[0036] The audio system also includes several baffles 4, which are used to block the vibration waves generated when the piezoelectric sheet 2 vibrates. The several baffles 4 are independently disposed on the soft membrane 1 and located between adjacent piezoelectric sheets 2.

[0037] The piezoelectric sheet 2 is configured as a piezoelectric ceramic sheet with a coplanar electrode structure, that is, the ceramic part of the piezoelectric sheet is a coplanar ceramic structure, which facilitates the output of positive and negative electrodes. Several piezoelectric sheets 2 are independently bonded to the soft film 1 with adhesive (and these piezoelectric sheets 2 are arranged in a matrix on the soft film 1). The FPC board 3 is electrically connected to the positive electrode of all the piezoelectric sheets 2 with conductive adhesive. Several baffles 4 are also independently bonded to the soft film 1 with adhesive.

[0038] Specifically, since the soft membrane 1 has a large number of piezoelectric elements 2, and these elements interfere with each other, resulting in inconsistent resonant frequencies for each element, a baffle 4 is designed in the under-screen ultrasonic directional audio system structure of Example 1 to solve this problem. The baffle 4 can prevent mutual interference between the piezoelectric elements. When the piezoelectric element 2 vibrates, the generated vibration wave will spread along the outer ring of the piezoelectric element 2. When it encounters the fixed baffle 4, the vibration wave will be effectively blocked by the baffle 4, thereby avoiding interference between the piezoelectric elements 2 and realizing directional propagation of sound waves.

[0039] Example 2

[0040] like Figure 3 As shown in Embodiment 2, a screen-mounted ultrasonic directional audio system is designed, which includes the following structural configuration:

[0041] Soft film (i.e., mobile phone soft screen) 1;

[0042] Several piezoelectric elements 2 are independently disposed on the soft film 1;

[0043] And FPC board 3, which is electrically connected to the positive electrode of all piezoelectric sheets 2;

[0044] The audio system does not include several baffles 4, but sets the spacing between adjacent piezoelectric sheets 2 to D, and makes the spacing D of the piezoelectric sheets 2 satisfy D=λ, where λ represents the wavelength of the vibration wave generated by the piezoelectric sheet 2, wavelength = wave speed / frequency, that is, λ=v / f, v represents the propagation speed of the vibration wave generated by the piezoelectric sheet 2 in the soft film 1 (medium) (unit, m / s), and f represents the resonant frequency of the piezoelectric sheet 2 (unit, Hz);

[0045] The piezoelectric sheet 2 is configured as a piezoelectric ceramic sheet with a coplanar electrode structure, that is, the ceramic part of the piezoelectric sheet is a coplanar ceramic structure, which facilitates the output of positive and negative electrodes. Several piezoelectric sheets 2 are independently bonded to the soft film 1 with adhesive (and these piezoelectric sheets 2 are arranged in a honeycomb pattern on the soft film 1). The FPC plate 3 is electrically connected to the positive electrode of all the piezoelectric sheets 2 with conductive adhesive. Several baffles 4 are also independently bonded to the soft film 1 with adhesive.

[0046] Specifically, in the under-screen ultrasonic directional audio system structure designed in Embodiment 2, the baffle 4 of Embodiment 1 is not used. Instead, several piezoelectric sheets 2 are arranged in a honeycomb pattern, and the spacing between the piezoelectric sheets 2 needs to be set according to the wavelength of the vibration wave generated by the piezoelectric sheets 2. This arrangement can effectively avoid mutual interference between the piezoelectric sheets 2 and realize the directional propagation of sound waves. The vibration of each piezoelectric sheet 2 will generate a sound wave signal with a certain angle. The sound of a single piezoelectric sheet 2 is relatively small, so multiple piezoelectric sheets 2 need to be combined to increase the sound pressure. The arrangement of the piezoelectric sheets 2 is also diverse, and can be honeycomb or rectangular array. The number of piezoelectric sheets 2 determines the sound pressure and transmission distance, and the specific number can be set to 16 to 512.

[0047] In summary, the under-screen ultrasonic directional audio system designed in this utility model can be applied in the confined space of a mobile phone and can achieve directional sound propagation. At the same time, this audio system independently sets up several piezoelectric elements 2, which can form individual entities that emit sound wave signals. This allows for the replacement of individual piezoelectric elements 2, which facilitates the use and maintenance of the system and can also reduce manufacturing and maintenance costs.

[0048] The above-described preferred embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of this utility model. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A screen-mounted ultrasonic directional audio system, characterized in that, The audio system includes the following structural configuration: Soft membrane (1); Several piezoelectric elements (2) are independently disposed on the soft film (1); And the FPC board (3), which is electrically connected to the positive electrode of all the piezoelectric sheets (2); The audio system may or may not include several baffles (4) for blocking the vibration waves generated when the piezoelectric sheet (2) vibrates; If the baffle (4) is included, then several baffles (4) are independently disposed on the soft film (1) and located between adjacent piezoelectric sheets (2); If the baffle (4) is not included, the spacing between adjacent piezoelectric pieces (2) is set to D, and D = λ, where λ represents the wavelength of the vibration wave generated by the piezoelectric piece (2).

2. The under-screen ultrasonic directional audio system according to claim 1, characterized in that, The piezoelectric sheet (2) is configured as a piezoelectric ceramic sheet with a coplanar electrode structure.

3. The under-screen ultrasonic directional audio system according to claim 1, characterized in that, Several of the piezoelectric sheets (2) are arranged in a honeycomb or matrix pattern on the soft film (1).

4. A screen-mounted ultrasonic directional audio system according to claim 1 or 3, characterized in that, Several of the piezoelectric sheets (2) are individually bonded to the soft film (1) by adhesive.

5. The under-screen ultrasonic directional audio system according to claim 1, characterized in that, The FPC board (3) is connected to the positive electrode of the piezoelectric sheet (2) through conductive adhesive.

6. The under-screen ultrasonic directional audio system according to claim 1, characterized in that, The number of piezoelectric elements (2) is set to 16 to 512.

7. The under-screen ultrasonic directional audio system according to claim 1, characterized in that, Several of the baffles (4) are individually and independently bonded to the soft film (1) by adhesive.

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