WO2022121590A1

WO2022121590A1 - Sound generation board and projection screen

Info

Publication number: WO2022121590A1
Application number: PCT/CN2021/129206
Authority: WO
Inventors: 邢哲; 戴洁; 魏伟达; 徐虹哲; 崔雷
Original assignee: 青岛海信激光显示股份有限公司
Priority date: 2020-12-09
Filing date: 2021-11-08
Publication date: 2022-06-16

Abstract

A sound generation board (000) and a projection screen. The sound generation board (000) comprises a honeycomb core layer (100), a first skin (200) and a second skin (300). The honeycomb core layer (100) comprises a first sub-honeycomb core layer (101) and two second sub-honeycomb core layers (102), wherein the two second sub-honeycomb core layers (102) are both connected to the first sub-honeycomb core layer (101); the thickness of the first sub-honeycomb core layer (101) is greater than the thickness of either of the second sub-honeycomb core layers (102); and the surface of the first sub-honeycomb core layer (101) that comes in contact with the first skin (200) and the surfaces of the second sub-honeycomb core layers (102) that come in contact with the first skin (200) are coplanar.

Description

Sound board and projection screen

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of Chinese patent applications with application numbers 202011449617.3, 202011449600.8 and 202011430213.X filed with the China Patent Office on December 09, 2020, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of laser projection, and in particular, to a sounding board and a projection screen.

Background technique

The laser projection system includes a projection screen and a laser projection device. The laser projection device can project images on the projection screen to realize functions such as video playback.

At present, the sound-generating components in the laser projection system can be integrated into the projection screen. The projection screen includes: display function layer, sounding board and exciter. Wherein, the display function layer is bonded with the sounding board, and the exciter is bonded with the side of the sounding board away from the display function layer. The exciter drives the sounding plate to vibrate to produce sound.

SUMMARY OF THE INVENTION

In one aspect, a sound-generating panel is provided, the sound-generating panel comprising: a honeycomb core layer, and a first skin and a second skin on both sides of the honeycomb core layer, the first skin and the first skin Both skins are connected to the honeycomb core layer; the honeycomb core layer includes: a first sub-honeycomb core layer, and two second sub-honeycomb core layers located on both sides of the first sub-honeycomb core layer, and The two second sub-honeycomb core layers are both connected to the first sub-honeycomb core layer; wherein, the thickness of the first sub-honeycomb core layer is greater than the thickness of the second sub-honeycomb core layer, and the first sub-honeycomb core layer is The surface of the sub-honeycomb core layer in contact with the first skin is coplanar with the surface of the second sub-honeycomb layer in contact with the first skin.

In another aspect, a projection screen is provided, the projection screen comprising: the above sounding board; a display function layer, the display function layer is connected to a side of the sounding board away from the honeycomb core layer of the first skin; And, an exciter, the exciter is connected to the side of the second skin of the sounding board away from the honeycomb core layer, and the exciter is used to drive the sounding board to vibrate to emit sound.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the structural representation of a kind of sounding board provided by the related art;

Figure 2-1 is an exploded view of the sounding board shown in Figure 1;

Figure 2-2 is a schematic structural diagram of the honeycomb core layer in the sounding board shown in Figure 1;

3 is an exploded view of the structure of a sounding board provided by an embodiment of the present application;

Fig. 4 is the structural representation of the honeycomb core layer in the sounding board shown in Fig. 3;

5 is an exploded view of the structure of a sounding board provided by an embodiment of the present application;

Fig. 6 is the structural representation of the honeycomb core layer in the sounding board shown in Fig. 5;

Figure 7 is a side view of the sounding board shown in Figure 5;

8 is a structural exploded view of another sounding board provided by an embodiment of the present application;

Fig. 9 is the structural schematic diagram of the honeycomb core layer in the sounding board shown in Fig. 8;

Figure 10 is a side view of the sounding board shown in Figure 8;

Fig. 11 is the pattern of the orthographic projection of the first honeycomb core and the second honeycomb core on the first skin shown in Fig. 9;

12 is a schematic diagram of an arrangement of a first sub-honeycomb core layer and two second sub-honeycomb core layers provided by an embodiment of the present application;

13 is a schematic diagram of another arrangement of the first sub-honeycomb core layer and the two second sub-honeycomb core layers provided by the embodiment of the present application;

14 is a schematic diagram of another arrangement of the first sub-honeycomb core layer and the two second sub-honeycomb core layers provided by the embodiment of the present application;

15 is a schematic structural diagram of a projection screen provided by an embodiment of the present application;

Figure 16 is an exploded view of the projection screen shown in Figure 15;

17 is an effect diagram of a sounding board provided in an embodiment of the present application when it is in a multi-mode state;

FIG. 18 is a schematic structural diagram of a laser projection system provided by an embodiment of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 and FIG. 2-1 , FIG. 1 is a schematic structural diagram of a sounding board provided by the related art, and FIG. 2-1 is an exploded view of the sounding board shown in FIG. 1 . The sound-emitting panel includes a honeycomb core layer 01 , two skins 02 on both sides of the honeycomb core layer 01 , and an adhesive layer 03 between the honeycomb core layer 01 and each skin 02 . The skin 02 is bonded to the honeycomb core layer 01 through the bonding layer 03 . The two skins 02 include a first skin and a second skin, wherein the first skin is bonded to the display function layer, and the second skin is bonded to the exciter.

In order to ensure that the display function layer can display a picture with better effect, it is necessary to ensure that the flatness of the sounding board is high. In the related art, the honeycomb core layer 01 is usually composed of honeycomb cores with the same thickness, shape and size, so as to ensure the high flatness of the sounding board. However, the overall thickness of the honeycomb core layer 01 is too large, resulting in a large weight of the sounding board. When the projection screen presents a bass effect, the force exerted by the exciter on the sounding plate is small, and the weight of the sounding plate is large, so that the exciter drives the sounding plate to vibrate with a small amplitude, which in turn leads to the bass of the projection screen. less effective.

In recent years, the display screens of various electronic devices such as mobile phones, tablet computers, laptop computers, and laser TVs are screen products of multi-layer composite structure. Due to different materials, the thermal expansion coefficient of each layer structure is different. Taking the projection screen as an example, when the temperature or humidity of the projection screen changes greatly, the amount of expansion and contraction of each layer structure is different, and it cannot expand or contract freely. The restored deformation affects the optical effect and flatness of the projection screen; for the sound-emitting projection screen, the optical film and the aluminum honeycomb panel are bonded together, and the internal stress generated between the optical film and the aluminum honeycomb panel, It also affects its acoustics.

Please refer to FIG. 5 , which is a structural exploded view of a sounding board provided by an embodiment of the present application.

Soundboard 000 includes:

The honeycomb core layer 100 , and the first skin 200 and the second skin 300 located on both sides of the honeycomb core layer 100 , and the first skin 200 and the second skin 300 are both connected to the honeycomb core layer 100 .

Please refer to FIG. 6 , which is a schematic structural diagram of the honeycomb core layer in the sounding board shown in FIG. 5 . The honeycomb core layer 100 includes: a first sub-honeycomb core layer 101, and two second sub-honeycomb core layers 102 located on both sides of the first sub-honeycomb core layer 101, and the two second sub-honeycomb core layers 102 are both connected to the first sub-honeycomb core layer 102. The sub-honeycomb core layers 101 are connected.

FIG. 7 is a side view of the sounding board shown in FIG. 5 . As shown in FIG. 7 , the thickness of the first sub-honeycomb core layer 101 is greater than the thickness of the second sub-honeycomb core layer 102 , and the first sub-honeycomb core layer 101 and the The side of a skin 200 in contact is coplanar with the side of the second sub-honeycomb core layer 102 in contact with the first skin 200 .

In some embodiments of the present application, the honeycomb core layer 100 in the acoustic panel 000 is composed of a first sub-honeycomb core layer 101 and two second sub-honeycomb core layers 102 located on both sides of the first sub-honeycomb core layer 101 . Because the side of the first sub-honeycomb core layer 101 in contact with the first skin 200 is coplanar with the side of the second sub-honeycomb core layer 102 in contact with the first skin 200 . Therefore, the flatness of the first skin 200 is relatively high. When the side of the first skin 200 away from the honeycomb core layer 100 is subsequently connected to the display functional layer, the flatness of the display functional layer can be guaranteed to be relatively high. Meanwhile, since the thickness of the second sub-honeycomb core layer 102 is smaller than that of the first sub-honeycomb core layer 101 , the overall weight of the honeycomb core layer 100 in the sound-emitting panel 000 is reduced. The projection screen including the sound-emitting panel 000 presents the bass effect by increasing the amplitude of the exciter in the projection screen to drive the sound-emitting panel 000 to vibrate.

To sum up, some embodiments of the present application provide sound-emitting panels, including: a honeycomb core layer, a first skin, and a second skin. The honeycomb core layer consists of a first sub-honeycomb core layer and two second sub-honeycomb core layers located on both sides of the first sub-honeycomb core layer. Since the surface of the first sub-honeycomb core layer in contact with the first skin is coplanar with the surface of the second sub-honeycomb core layer in contact with the first skin, the flatness of the first skin is relatively high. When the side of the skin away from the honeycomb core layer is connected with the display function layer, the flatness of the display function layer is higher. Meanwhile, since the thickness of the second sub-honeycomb core layer is smaller than that of the first sub-honeycomb core layer, the overall weight of the honeycomb core layer in the sound-emitting panel is reduced. The projection screen including the sound-emitting panel 000 presents the bass effect by increasing the amplitude of the exciter in the projection screen to drive the sound-emitting panel 000 to vibrate.

In the related art, please refer to FIG. 2-2. FIG. 2-2 is a schematic structural diagram of the honeycomb core layer in the sounding board shown in FIG. 1. The honeycomb core layer 01 in the sounding board is composed of a plurality of honeycomb cores with the same shape. 011, a plurality of honeycomb cores 011 are regular hexagonal honeycomb cores.

However, the anisotropy of the regular hexagonal structure is poor. When the honeycomb core layer 01 in the sounding board is composed of a plurality of regular hexagonal honeycomb cores 011 with the same shape, the difference in the conduction performance of the sounding board to vibration in all directions (x direction and y direction in Figure 2) is small, As a result, the frequency response range of the sound emitted by the sounding plate vibrating under the driving of the exciter is narrow, and the sound-emitting effect of the projection screen is poor.

Some embodiments of the present application provide a sound-generating panel, comprising: a honeycomb core layer 100, and a first skin 200 and a second skin 300 on both sides of the honeycomb core layer, the first skin 200 and The second skins 300 are all connected with the honeycomb core layer 100; the honeycomb core layer has a plurality of honeycomb cores, each of which is on the first skin or the second skin. The shape of the orthographic projection is a hexagonal ring, and the hexagonal ring has four first included angles with the same angle and two second included angles with the same angle, the first included angle and the second included angle The absolute value of the difference of the angles is greater than or equal to the first preset angle.

In some embodiments, the honeycomb core layer is in the shape of a rectangular plate. Since the orthographic projection of the honeycomb core in the honeycomb core layer on the first skin or the second skin is a hexagonal annular ring, the absolute value of the difference between the first included angle and the second included angle is greater than or equal to The first preset angle, therefore, in the direction along the long side of the rectangle (ie the x direction), the arrangement density of the honeycomb core walls in the honeycomb core, and in the direction along the short side of the rectangle (ie the y direction) , the arrangement density of the honeycomb core wall in the honeycomb core is quite different. In this way, the conduction performance of the sounding plate vibrating in the x-direction and the y-direction is quite different. For the projection screen prepared by using the sounding board, the sound produced by the sounding board vibrating under the driving of the exciter has a wider frequency response range, thereby improving the sounding effect of the projection screen.

Please refer to FIG. 3 , which is a structural exploded view of a sounding board provided by some embodiments of the present application. Soundboard 000 includes:

FIG. 4 is a schematic structural diagram of the honeycomb core layer in the sounding board shown in FIG. 3 . Referring to FIG. 4 , the honeycomb core layer 100 has a plurality of honeycomb cores 100 a, and the orthographic projection of each honeycomb core 100 a on the first skin 200 or the second skin 300 is a hexagonal ring shape.

FIG. 11 is an effect diagram of the orthographic projection of the honeycomb core in the honeycomb core layer shown in FIG. 3 on the skin. As shown in FIG. 11 , the hexagonal ring has four first included angles α with the same angle and two second included angles β with the same angle. The absolute value of the difference between the first angle α and the second angle β is greater than or equal to the first preset angle.

In the related art, as shown in Fig. 2-2, the sounding board is in the shape of a rectangular plate, and the honeycomb core layer 01 in the sounding board is composed of a plurality of regular hexagonal honeycomb cores 011 with the same shape. Since the regular hexagonal structure is close to the circular structure, the honeycomb walls of the regular hexagonal honeycomb core 011 in the honeycomb core layer 01 in the x direction (the long side direction of the rectangle) and the y direction (the short side direction of the rectangle) The arrangement density is similar, resulting in a small difference in the conduction performance of the sounding board vibrating in the x-direction and the y-direction, which in turn leads to a narrower frequency response range of the sound produced by the sounding board vibrating under the drive of the exciter, and the sounding effect of the projection screen. Difference.

In some embodiments of the present application, as shown in FIG. 3 , FIG. 4 and FIG. 11 , the sound-emitting panel 000 is in the shape of a rectangular plate. The orthographic projection on the skin 300 is a hexagonal ring, and the absolute value of the difference between the first included angle α and the second included angle β is greater than or equal to the first preset angle. In the side x direction, the arrangement density of the honeycomb core walls in the honeycomb core 100a in the honeycomb core layer 100 is the same as that of the honeycomb core walls in the honeycomb core 100a in the honeycomb core layer 100 in the y direction along the short side of the rectangle. The arrangement density varies greatly. For example, when the first included angle α is greater than the second included angle β, the arrangement density of the honeycomb core walls in the honeycomb core 100a in the honeycomb core layer 100 along the x-direction of the long side of the rectangle is smaller than that along the length of the rectangle. The density of the arrangement in the y-direction of the short side.

In this way, the vibration conduction performance of the sounding board 000 in the x-direction and the y-direction is quite different. Therefore, the projection screen prepared by using the sounding board 000 has a wider frequency response range of the sound produced by the sounding board 000 vibrating under the driving of the exciter, thereby improving the sounding effect of the projection screen.

To sum up, some embodiments of the present application provide sound-emitting panels, including: a honeycomb core layer, a first skin and a second skin. The honeycomb core layer is in the shape of a rectangular plate. Since the orthographic projection of the honeycomb core in the honeycomb core layer on the first skin or the second skin is a hexagonal annular ring, the absolute value of the difference between the first included angle and the second included angle is greater than or equal to The first preset angle, therefore, the arrangement density of the honeycomb core walls in the honeycomb core in the x direction along the long side of the rectangle is quite different from the arrangement density along the short side y direction of the rectangle. In this way, the conduction performance of the sounding plate vibrating in the x-direction and the y-direction is quite different. Therefore, the projection screen prepared by using the sounding board has a wider frequency response range of the sound produced by the sounding board vibrating under the driving of the exciter, thereby improving the sounding effect of the projection screen.

In some embodiments of the present application, as shown in FIG. 11 , the orthographic projection of the plurality of honeycomb cores 100 a in the honeycomb core layer 100 on the first skin 200 or the second skin 300 is a hexagonal ring shape, which The absolute value of the difference between the first included angle α and the second included angle β is smaller than or equal to the second preset angle. In this way, the strength of the plurality of honeycomb cores 100a in the honeycomb core layer 100 in the x-direction or the y-direction can be ensured.

For example, the first preset angle is 30 degrees, and the second preset angle is 120 degrees. That is, the range of the absolute value of the difference between the first included angle α and the second included angle β is: 30 degrees to 120 degrees.

In some embodiments of the present application, the sound-emitting panel 000 is in the shape of a rectangular plate, and the shape of the sound-emitting panel 000 is the same as that of the honeycomb core layer 100 . As shown in FIG. 11 , the orthographic projection of the plurality of honeycomb cores 100 a in the honeycomb core layer 100 on the first skin 200 or the second skin 300 is a hexagonal annular ring, and the first included angle α is greater than the second included angle α angle β. The hexagonal ring has a symmetry axis parallel to the direction of the long side of the sounding plate 000 , and the symmetry axis penetrates two second included angles β of the hexagonal ring. In this way, the arrangement density of the honeycomb core walls in the honeycomb core 100a in the honeycomb core layer 100 along the short side y direction of the sound-emitting panel is greater than the arrangement density along the long side x-direction of the sound-emitting panel. On the premise of ensuring the overall strength of the honeycomb core layer 100, the frequency response range of the sound emitted by the sounding board 000 vibrating under the driving of the exciter is increased, and the sounding effect of the projection screen is improved.

It should be noted that some embodiments of the present application are schematically illustrated by taking an example that the first included angle α is greater than the second included angle β. In other possible implementations, the first included angle α is smaller than the second included angle α. The included angle β is not limited in this embodiment of the present application.

Please refer to FIG. 8 , FIG. 9 and FIG. 10 , FIG. 8 is a structural exploded view of another sounding board provided by some embodiments of the present application, and FIG. 9 is a schematic structural diagram of the honeycomb core layer in the sounding board shown in FIG. 8 , FIG. 10 is a side view of the sounding board shown in FIG. 8 .

The acoustic panel 000 further includes: a first adhesive layer 400 located between the first skin 200 and the honeycomb core layer 100 , and a second adhesive layer 500 located between the second skin 300 and the honeycomb core layer 100 . The first skin 200 is adhered to the honeycomb core layer 100 through the first adhesive layer 400 , and the second skin 300 is adhered to the honeycomb core layer 100 through the second adhesive layer 500 .

In a possible implementation manner, both the first adhesive layer 400 and the second adhesive layer 500 are adhesives such as glue, adhesive film or double-sided tape.

It should be noted that, as shown in FIG. 10 , since the first sub-honeycomb core layer 101 in the honeycomb core layer 100 is close to one side of the first skin 200 , and the second sub-honeycomb core layer 102 in the honeycomb core layer 100 is close to the first sub-honeycomb core layer 102 One side of the skin 200 is coplanar. Therefore, after the first skin 200 is bonded to one side of the honeycomb core layer 100 through the first adhesive layer 400 , the flatness of the first skin 200 is relatively high. Since the material of the skin in the sounding board 000 is selected from flexible materials such as glass fiber or carbon fiber, when the second skin 300 is bonded to the other side of the honeycomb core layer 100 through the second bonding layer 500, the The second skin 300 closely adheres to the first sub-honeycomb core layer 101 in the honeycomb core layer 100 , and also makes the second skin 300 closely adhere to the second sub-honeycomb core layer 102 in the honeycomb core layer 100 . In this case, the second skin 300 is not a flat structure, but a bent structure.

In a possible implementation manner, the material of the honeycomb core layer 100 in the sounding board 000 is: paper, aramid fiber, metal or other composite materials.

In a possible embodiment, the first skin 200 and the second skin 300 have the same thickness, and in a possible embodiment, the first skin 200 and the second skin 300 have different thicknesses. Exemplarily, the thicknesses of the first skin 200 and the second skin are both in the range of 0.1 to 0.5 mm.

In some embodiments of the present application, the thickness of the first sub-honeycomb core layer 101 in the honeycomb core layer 100 ranges from 8 to 15 millimeters. There are many possible implementation manners for the thickness range of the two second sub-honeycomb core layers 102 in the honeycomb core layer 100 , and the following three possible implementation manners are taken as examples for schematic illustration in this embodiment of the present application:

In a first possible implementation manner, the thicknesses of the two second sub-honeycomb core layers 102 in the honeycomb core layer 100 are both in the range of 5 to 8 mm.

In a second possible implementation manner, the thicknesses of the two second sub-honeycomb core layers 102 in the honeycomb core layer 100 are both in the range of 2 to 5 mm.

In a third possible implementation manner, the thickness of one of the two second sub honeycomb core layers 102 in the honeycomb core layer 100 ranges from 5 to 8 mm, and the thickness of the other second sub honeycomb core layer 102 is in the range of 5 to 8 mm. The thickness of the honeycomb core layer 102 ranges from 2 to 5 millimeters.

In some embodiments of the present application, please refer to FIG. 9 , the first sub-honeycomb core layer 101 in the honeycomb core layer 100 has a plurality of first honeycomb cores 101 a with the same shape, and two second sub-honeycomb core layers 100 in the honeycomb core layer 100 have a plurality of first honeycomb cores 101 a. The honeycomb core layer 102 has a plurality of second honeycomb cores 102a having the same shape. The orthographic projection of each first honeycomb core 101a on the first skin 200 is a first annular shape, the orthographic projection of each second honeycomb core 102a on the first skin 200 is a second annular shape, and the first annular shape The inner ring size of the second ring is smaller than the inner ring size of the second ring. In this way, the arrangement density of the second honeycomb cores 102a in the two second sub-honeycomb core layers 102 is smaller than the arrangement density of the first honeycomb cores 101a in the first sub-honeycomb core layer 101, which further reduces the weight of the honeycomb core layer 100 , thereby reducing the weight of the sounding board.

Illustratively, as shown in FIG. 9 , the first honeycomb core 101a and the second honeycomb core 102a are both hexagonal honeycomb cores. FIG. 11 is a pattern of an orthographic projection of the first honeycomb core and the second honeycomb core on the first skin shown in FIG. 9 . As shown in FIG. 11 , the orthographic first ring shape of each first honeycomb core 101 a on the first skin 200 and the orthographic second ring shape of each second honeycomb core 102 a on the first skin 200 are both hexagonal shaped ring. The hexagonal ring has four first included angles α with the same angle and two second included angles β with the same angle. The absolute value of the difference between the first angle α and the second angle β is greater than or equal to 0 degrees and less than or equal to 10 degrees. It should be noted that when the absolute value of the difference between the first included angle α and the second included angle β is 0 degrees, the first included angle α is equal to the second included angle β, that is, the hexagonal annular The angles of the six included angles are the same, and in this case, the hexagonal-shaped ring is a regular hexagonal-shaped ring.

In some embodiments of the present application, the length of the inner side of the first ring is smaller than the length of the inner side of the second ring. For example, the range of the inner side length of the first ring is: 2 to 5 mm, and the range of the inner side length of the second ring is: 2 to 10 mm. In some possible implementations, the inner side lengths of the second rings corresponding to the second honeycomb cores 102 a in the two second sub honeycomb core layers 102 are different, for example, the second honeycombs in one second sub honeycomb core layer 102 The inner side length of the second ring shape corresponding to the core 102 a is 6 mm, and the inner side length of the second ring shape corresponding to the second honeycomb core 102 a in the other second sub-honeycomb core layer 102 is 8 mm.

In some embodiments of the present application, the absolute value of the angle difference between the first included angle α and the second included angle β in the first annular shape is the difference between the first included angle α and the second included angle β in the second annular shape. The absolute value of the difference of the angles is the same or not.

In some embodiments of the present application, the wall thickness of the first honeycomb core 101 a in the first sub-honeycomb core layer 101 is greater than the wall thickness of the second honeycomb core 102 a in the second sub-honeycomb core layer 102 . Exemplarily, the wall thickness range of the first honeycomb core 101a and the wall thickness range of the second honeycomb core 102a are both 0.01 to 0.06 mm. In a possible embodiment, the wall thickness of the first honeycomb core 101a is different from the wall thickness of the second honeycomb core 102a in the two second sub-honeycomb core layers 102, for example, the first sub-honeycomb core layer 101 The wall thickness of the first honeycomb core 101a is 0.05 mm, the wall thickness of the second honeycomb core 102a in one second sub-honeycomb core layer 102 is 0.04 mm, and the second honeycomb core in the other second sub-honeycomb core layer 102 is 0.04 mm. The wall thickness of 102a may be 0.02 mm. In this way, the weight of the second sub-honeycomb core layer 102 is further reduced, thereby reducing the weight of the sound-emitting panel 000 .

In some possible embodiments, please refer to FIG. 9 , the sound-emitting panel 000 further includes: an isolation plate 600 located between the first sub-honeycomb core layer 101 and each of the second sub-honeycomb core layers 102 , wherein the first sub-honeycomb core layer 102 Both the layer 101 and the second sub-honeycomb core layer 102 are connected to the isolation plate 600 . Exemplarily, both the first sub-honeycomb core layer 101 and the second sub-honeycomb core layer 102 are bonded to the isolation board 600 by adhesives such as glue, adhesive film or double-sided tape. In this way, the isolation plate 600 can divide the honeycomb core layer 100 into three sound-emitting regions, and all the three sound-emitting regions can generate physical displacement and deformation, so that all the three sound-emitting regions can emit sound. Since the isolation plate 600 does not produce physical displacement and deformation, the probability that the physical displacement and deformation generated by the three sound-emitting regions will interfere with each other is reduced, and the stereo effect of the sound emitted by the sound-emitting plate 000 is effectively improved.

The isolation plate 600 increases the density of the modal vibration of the honeycomb core layer 100 , thereby increasing the sound field width of the sound emitted by the sound-emitting panel 000 and improving the sound-emitting effect of the sound-emitting panel 000 .

Illustratively, the thickness of the isolation plate 600 is 0.1 to 1 mm. The material of the isolation plate 600 includes metal aluminum.

In the embodiment of the present application, as shown in FIG. 8 and FIG. 9 , the sounding board 000 has a rectangular plate-like structure. There are various possible implementation manners for the arrangement of the first sub-honeycomb core layer 101 and the two second sub-honeycomb core layers 102 . The embodiments of the present application take the following three possible implementation manners as examples for schematic illustration:

In a first possible implementation manner, please refer to FIG. 12 , which is a schematic diagram of an arrangement manner of a first sub honeycomb core layer and two second sub honeycomb core layers provided by an embodiment of the present application. The two second sub-honeycomb core layers 102 and the first sub-honeycomb core layer 102 located between the two second sub-honeycomb core layers are arranged along the direction of the long side of the rectangle.

In a second possible implementation manner, please refer to FIG. 13 , which is a schematic diagram of another arrangement manner of the first subcellular core layer and the two second subcellular core layers provided by the embodiment of the present application. The two second sub honeycomb core layers 102 and the first sub honeycomb core layer 102 located between the two second sub honeycomb core layers are arranged along the direction of the short side of the rectangle.

In a third possible implementation manner, please refer to FIG. 14 . FIG. 14 is a schematic diagram of yet another arrangement manner of the first sub honeycomb core layer and the two second sub honeycomb core layers provided by the embodiment of the present application. The orthographic projection of the first sub-honeycomb core layer 101 on the first skin 200 is an isosceles triangle, the base of the isosceles triangle coincides with a long side of the rectangle, and the height of the isosceles triangle is equal to the length of the short side of the rectangle. The orthographic projection of each second sub-honeycomb core layer on the first skin 200 is a right-angled triangle, one right-angled side of the right-angled triangle coincides with one short side of the rectangle, and the other right-angled side coincides with the other long side of the rectangle.

In the above embodiment, the area of the orthographic projection of each second sub-honeycomb core layer 102 on the first skin 200 is the same, so that the weight distribution of the sound-emitting panel 000 is uniform.

To sum up, some embodiments of the present application provide sound-emitting panels, including: a honeycomb core layer, a first skin, and a second skin. The honeycomb core layer consists of a first sub-honeycomb core layer and two second sub-honeycomb core layers located on both sides of the first sub-honeycomb core layer. Since the surface of the first sub-honeycomb core layer in contact with the first skin and the surface of the second sub-honeycomb core layer in contact with the first skin are coplanar, the flatness of the first skin is relatively high. When the side of the skin away from the honeycomb core layer is connected with the display function layer, the flatness of the display function layer is higher. Meanwhile, since the thickness of the second sub-honeycomb core layer is smaller than that of the first sub-honeycomb core layer, the overall weight of the honeycomb core layer in the sound-emitting panel is reduced. When the projection screen prepared by using the sounding board needs to present the bass effect, the exciter in the projection screen drives the sounding board to vibrate to increase the amplitude, thereby improving the bass effect of the projection screen.

Some embodiments of the present application also provide a projection screen. For example, please refer to FIG. 15 and FIG. 16 , FIG. 15 is a schematic structural diagram of a projection screen provided by an embodiment of the present application, and FIG. 16 is an exploded view of the projection screen shown in FIG. 15 . The projection screen includes: a sounding board 000 , a display function layer 001 and an exciter 002 .

The sounding board 000 is the sounding board in the above embodiment.

The display function layer 001 is connected to the side of the first skin 200 in the sound emitting panel 000 away from the honeycomb core layer 100 . In this application, the structure formed by connecting the display function layer 001 and the sound-emitting panel 000 is called a sound-emitting screen.

It should be noted that, since the first sub-honeycomb core layer 101 and the two second sub-honeycomb core layers 102 in the honeycomb core layer 100 in the sounding board 000 share the same surface with the first skin 200 in the sounding board 000 Therefore, the first skin 200 in the sound-emitting panel 000 can satisfy the optical flatness of the display function layer 001 bonded thereto.

The exciter 002 is connected to the side of the second skin 300 in the sounding board 000 away from the honeycomb core layer 100 , and the exciter 002 is used to drive the sounding board 000 to vibrate to emit sound.

In some embodiments of the present application, the number of exciters 002 in the projection screen is multiple. There are various possible implementations of the position of the orthographic projection of the plurality of exciters 002 on the second skin 300 in the sounding board 000 . The embodiments of the present application take the following three possible implementation manners as examples for schematic illustration:

In a first possible implementation manner, the orthographic projections of the plurality of exciters 002 on the honeycomb core layer 100 in the sound emitting panel 000 are located in the area where the first sub-honeycomb core layer 101 in the honeycomb core layer 100 is located.

In a second possible implementation manner, the orthographic projection of the plurality of exciters 002 on the second skin 300 , the orthographic projection of the second sub-honeycomb core layer 102 located in the honeycomb core layer 100 on the second skin 300 Inside.

In a third possible implementation manner, the orthographic projection of the plurality of exciters 002 on the second skin 300 , a part of the first sub-honeycomb core layer 101 located in the honeycomb core layer 100 is an orthographic projection on the second skin 300 In the projection, another part is located in the orthographic projection of the second sub-honeycomb core layer 102 in the honeycomb core layer 100 on the second skin 300 .

For example, the exciter 002 in the projection screen is electrically connected to the laser projection device, and when the laser projection device is in operation, the exciter 002 sends sound electrical signals. After receiving the sound and electrical signal, the exciter 002 performs reciprocating motion based on the sound and electrical signal, so that the entire surface of the sounding board 000 vibrates together to emit sound, so that the projection screen can generate sound when the laser projection device is working.

In this application, please refer to FIG. 17 . FIG. 17 is an effect diagram of a sounding board provided by an embodiment of the present application when it is in a multi-mode state. The sound produced by the vibration of the sounding board 002 is multimodal on the entire surface of the sounding board 000 , so that the sounding board 000 can vibrate together at multiple positions on the surface as a whole, so that the front of the sounding board 000 can emit sound.

The display function layer 001 in the projection screen is a circular Fresnel optical film, a black grid screen or a white plastic screen. When the display function layer 001 in the projection screen is a circular Fresnel optical film, the display function layer 001 in the projection screen has a micro-mirror reflection structure, and the micro-mirror reflection structure directs the light emitted by the laser projection equipment in a specific direction to reflect. In this way, the light reflected by the micro-mirror reflective structure can reach the user's eyes to the maximum extent, so that the user can watch a clearer picture. For example, the thickness of the display function layer 001 ranges from 0.5 mm to 1.7 mm. For example, the thickness of the display function layer 001 may be 1.0 mm.

Exemplarily, as shown in FIG. 15 and FIG. 16 , the display function layer 001 is bonded to the first skin of the sound-emitting panel 000 through a third adhesive layer 003 . The third adhesive layer 003 is an adhesive such as glue, adhesive film or double-sided tape. The thickness of the third adhesive layer 003 ranges from 0.1 mm to 1 mm. For example, the thickness of the third adhesive layer 003 is 0.5 mm.

In this embodiment of the present application, please refer to FIG. 15 and FIG. 16 , the projection screen may further include: a frame body 004 . The frame body 004 is connected to the edge of the sound-emitting screen composed of the display function layer 001 and the sound-emitting panel 000 . For example, the frame body 004 can generally be a ring-shaped frame body matching the shape of the sound-emitting screen.

The sound-emitting screen composed of the display function layer 001 and the sound-emitting board 000 in the projection screen is in the shape of a rectangular plate, and the frame 004 in the projection screen includes: four strip structures corresponding to the four edges of the sound-emitting screen one-to-one. The four strip structures are connected end to end to form a rectangular frame matching the shape of the sound-emitting screen. Exemplarily, any two adjacent strip structures are connected by an L-shaped connecting piece, and the connecting piece and the strip structure are fastened and connected by screws. The material of the frame body 004 in the projection screen is plastic, aluminum alloy or magnesium alloy. In some embodiments of the present application, each strip structure has a clip slot, and each strip structure is clipped with a corresponding edge in the sound-emitting screen, so as to realize the connection between the frame body 004 and the sound-emitting screen.

In the projection screen, since the frame body 004 is connected to the edge of the sound-emitting screen composed of the display function layer 001 and the sound-emitting panel 000, the stress at the edge of the sound-emitting screen is relatively small, and the stress concentration occurs in the central area of the sound-emitting screen Phenomenon. In some embodiments of the present application, the thickness of the first sub-honeycomb core layer 101 located in the central region of the sound-emitting panel 000 is greater than the thickness of the second sub-honeycomb core layer 102 located on both sides thereof, then the first sub-honeycomb core layer 102 The layer 101 effectively relieves the stress concentration phenomenon in the central area of the projection screen, plays a certain supporting role in the central area of the sound-emitting screen, reduces the probability of deformation in the central area of the sound-emitting screen, thereby ensures the 001 optical flatness of the display function layer, and improves the The display effect of the projection screen.

In the embodiment of the present application, when the exciter 002 in the projection screen works, the exciter 002 drives the sounding board 000 to generate physical displacement and deformation, so that the sounding board 000 emits sound. Since the sounding board 000 and the display function layer 001 are bonded together, when the sounding board 000 is physically displaced and deformed, the sounding board 000 applies a force to the display function layer 001 . When the display function layer 001 is subjected to the force of the sounding board 000 , the contact portion between the display function layer 001 and the frame body 004 is easily damaged.

To this end, in a possible implementation manner, a shock absorbing structure 005 is provided at the position where the frame body 004 contacts the display function layer 001 to reduce the force of the sound plate 000 on the part of the display function layer 001 in contact with the frame body 004 . probability of damage. For example, the material of the shock absorbing structure 005 is a damping material such as butyl rubber or polyurethane foam.

In some embodiments of the present application, please refer to FIG. 15 and FIG. 16 , the projection screen further includes: a strip-shaped cover plate 006 . Both ends of the cover plate 006 are respectively connected to the frame body 004 , the exciter 002 is located between the sounding plate 000 and the cover plate 006 , and the exciter 002 is connected to the cover plate 006 . The cover plate 006 serves as a support reinforcement on the frame body 004 for shielding the exciter 002 .

In some embodiments, as shown in FIGS. 15 and 16 , the number of cover plates 006 in the projection screen is two, and the projection screen further includes a strip-shaped support plate 007 located between the two cover plates 006 . Both ends of the support plate 007 are connected to the frame body 004 . The support plate 007 supports the sounding board 000 in the projection screen, prevents the sounding board 000 from collapsing in the center, and improves the stability of the projection screen.

Exemplarily, the length directions of the two cover plates 006 and the length direction of the support plate 007 in the projection screen are parallel, and both ends of each cover plate 006 and both ends of the support plate 007 are connected to the frame 004 by screws . In a possible implementation manner, shock-absorbing layers are provided at the positions where both ends of each cover plate 006 and the two ends of the support plate 007 are in contact with the frame body 004 , and the thickness of the shock-absorbing layers ranges from 0.5 mm to 0.8 mm. . Materials for the shock-absorbing layer include: acrylic sub-mineral tape, similar tape, silicone pad or foam, etc. Under the action of reducing the vibration of the sound-emitting plate 000, the shock-absorbing layer reduces the probability of noise caused by collision between the cover plate 006 and the frame body 004, and further improves the sound effect of the sound emitted by the projection screen.

In some embodiments of the present application, the plurality of exciters 002 between the cover plate 006 in the projection screen and the sound-emitting plate 000 are all bonded to the cover plate 006 through a shock-absorbing adhesive layer, so as to realize the high-quality sound in the display device 000 . A tight connection between the actuator 006 and the cover plate 006.

For example, when the exciter 002 and the cover plate 006 are bonded by a shock-absorbing adhesive layer, the hard contact between the exciter 002 and the cover plate 006 is prevented, and the application of the exciter 002 to the cover plate 006 during operation is reduced. Therefore, the probability of the mechanical vibration phenomenon of the cover plate 006 during the working process of the exciter 002 is reduced, and the volume of the noise emitted by the cover plate 006 when the mechanical vibration phenomenon occurs can be reduced, which improves the projection screen. The sound effect of the sound produced.

As for the structure of the shock-absorbing adhesive layer, the following two cases are taken as examples for a schematic illustration in the embodiments of the present application:

In the first case, the shock-absorbing adhesive layer includes: shock-absorbing foam, and double-sided adhesive tapes located on both sides of the shock-absorbing foam. The shock-absorbing foam and the actuator 002 are bonded by double-sided tape, and the shock-absorbing foam and the cover plate 006 can also be bonded by double-sided tape. There is a gap between the exciter 002 and the cover plate 006, and the shock-absorbing foam is filled in the gap. The thickness of the shock-absorbing foam ranges from 0.2 mm to 0.5 mm.

In the second case, the shock-absorbing adhesive layer includes: a modified rubber material layer. The thickness of the modified rubber material layer may be 2 mm to 2.5 mm. The modified rubber material layer has better flexibility and better adhesion. The modified rubber material layer also has the properties of high temperature resistance and low temperature resistance. For example, the modified rubber material layer is not easy to drip at high temperature, and is not easy to harden and fall off at low temperature, and the modified rubber material layer can meet the usage environment of the projection screen in the laser projection system. At the same time, the modified rubber material layer can ensure a certain elasticity, and can better play a buffering role in the process of the reciprocating motion of the exciter 002 .

In some embodiments of the present application, the plurality of exciters 002 between the cover plate 006 in the projection screen and the sound-emitting screen 000 are all fixedly connected to the side of the display function layer 001 in the sound-emitting plate 000 away from the display function layer 001 by means of adhesive bonding . Exemplarily, the adhesive layer between the exciter 002 and the sounding board 000 includes adhesives such as foam glue, glue, adhesive film or double-sided tape.

In a possible implementation, please refer to FIG. 15 and FIG. 16 , the projection screen further includes: a suspension bracket 008 . The suspension bracket 008 includes: a sheet-shaped hook connected with the frame body 004, and a sheet-shaped fixing part connected with the hook, and the fixing part can be fixedly connected to the wall through a set screw. With the hanging bracket 008, the projection screen 000 can be hung on the wall.

In a possible implementation manner, the material of the suspension bracket 008 includes: plastic, aluminum, aluminum-plastic plate, steel, or carbon fiber composite plate and other materials.

For example, the part of the suspension bracket 008 in contact with the frame body 004 is provided with a shock absorbing layer, and the thickness of the shock absorbing layer may range from 0.5 mm to 0.8 mm. The material of the shock-absorbing layer may include: acrylic sub-mineral tape, similar tape, silicone pad or foam, etc. The shock-absorbing layer improves the stability of the projection screen hanging on the wall, and at the same time, it can also reduce the probability of noise generated by the collision between the suspension bracket 008 and the frame 004 due to the vibration of the sounding board 000, and further Improved the sound quality of the sound from the projection screen.

To sum up, the projection screen provided by some embodiments of the present application includes: a sounding board, a display function layer, and an exciter. The honeycomb core layer in the sounding board is composed of a first sub-honeycomb core layer and two second sub-honeycomb core layers located on both sides of the first sub-honeycomb core layer. Since the surface of the first sub-honeycomb core layer in contact with the first skin is coplanar with the surface of the second sub-honeycomb core layer in contact with the first skin, the flatness of the first skin is relatively high. When the side of the skin away from the honeycomb core layer is connected with the display function layer, the flatness of the display function layer can be guaranteed to be high. Meanwhile, since the thickness of the second sub-honeycomb core layer is smaller than that of the first sub-honeycomb core layer, the overall weight of the honeycomb core layer in the sound-emitting panel is reduced. When the projection screen prepared by using the sounding board needs to present a bass effect, the exciter in the projection screen can drive the sounding board to vibrate to increase the amplitude, thereby improving the bass effect of the projection screen.

Some embodiments of the present application also provide a laser projection system. In a possible implementation manner, the laser projection system is an ultra-short-focus laser projection system. For example, refer to FIG. 18 , which is a schematic structural diagram of a laser projection system provided by an embodiment of the present application. The laser projection system includes: a projection screen 010 and a laser projection device 020 . The projection screen 010 may be the projection screen in the above embodiment. The laser projection device 020 may be electrically connected to the actuators in the projection screen 010 .

In this way, when the laser projection device 020 is working, the laser projection device 010 emits light obliquely upward, so that the laser projection device 020 can project a picture to the projection screen 010; and the laser projection device 020 also sends a sound to the exciter in the projection screen 010 The electric signal enables the projection screen 010 to emit sound while displaying the projection picture.

Some embodiments of the present application also provide a projection screen, comprising a display function layer, a first skin, a support layer, and a second skin that are stacked in sequence; the first skin and the second skin are used for The support layer is wrapped, and the first skin is connected to the display function layer; the thermal expansion coefficient of the material of the display function layer is the same as or different from the thermal expansion coefficient of the material of the second skin by 0.5×10- Within 5m/(m·k).

In some embodiments of the present application, the support layer is the honeycomb core layer in the above embodiments.

In some possible embodiments of the present application, the display functional layer is an optical film, and the material of the optical film is any one of PMMA, PET, PP, and PE.

In some possible embodiments of the present application, the display functional layer is a black screen, and the material of the black screen is any one of PEN, PA, PS, and EVA.

In some possible embodiments of the present application, the display functional layer is a white plastic screen, and the material of the white plastic screen is PVC.

In some possible embodiments of the present application, the first skin is bonded to the display function layer and the support layer, respectively; and/or the second skin is bonded to the support layer.

In some possible embodiments of the present application, the thickness of the display functional layer is 0.5-1.7 mm; and/or the thickness of the adhesive layer between the first skin and the display functional layer is 0.1-1.7 mm 1 mm; and/or, the thickness of the first skin is 0.5 to 1.5 mm; and/or, the thickness of the support layer is 5 to 8 mm; and/or, the thickness of the second skin is 0.5 to 0.5 mm. 1.7 mm; and/or, the thickness of the adhesive layer between the first skin and the support layer and the thickness of the adhesive layer between the second skin and the support layer are both 0.1 ~2mm.

In some possible embodiments of the present application, an exciter is further included, and the exciter is installed on a side of the second skin away from the support layer.

In some possible embodiments of the present application, the material of the first skin is any one of plastic, aluminum, aluminum-plastic panel, steel, and carbon fiber composite panel.

In some possible embodiments of the present application, the support layer is an aluminum honeycomb core or a PP honeycomb core.

In some possible embodiments of the present application, the support layer is a honeycomb core, the support layer is composed of a first sub-honeycomb core and a second sub-honeycomb core, and the first sub-honeycomb core is located in the middle of the support layer , the second sub-honeycomb core is located in an area of the support layer close to the edge, and the density of the first sub-honeycomb core is greater than the density of the second sub-honeycomb core.

In some possible embodiments of the present application, the support layer further includes an isolation support plate, and the isolation support plate connects the first sub-honeycomb core and the second sub-honeycomb core.

When the external temperature or humidity changes greatly, the display function layer 001 and the second skin 300 in the outer layer of the projection screen 010 in the embodiment of the present application are both deformed. The thermal expansion coefficients of the materials used in the second skin 300 are the same or within 0.5×10-5m/(m·k) (the difference is small), so the internal stress generated by the display functional layer 001 and the second skin 300 is basically the same or The difference is small, and the acting forces on both sides of the inner first skin 200 and the two sides of the support layer are basically the same or have a small difference, so that the display function layer 001, the first skin 200, the support layer and the second skin 300 can be Deformation occurs at the same time, and it expands or shrinks more freely, thereby reducing the screen opening or irrecoverable deformation caused by the different expansion or shrinkage of each layer structure in the projection screen 010. The optical effect and flatness of the projection screen 010 The stability of the sound-emitting projection screen is relatively high; and for the solution in which the projection screen 010 of the embodiment of the present application is a sound-emitting projection screen, the acoustic effect of the sound-emitting projection screen can also be relatively stable when thermal expansion and cold contraction occur.

For different display function layers 001, different materials are used.

In some embodiments, the display function layer 001 in the projection screen 010 is an optical film, and the material of the optical film is PMMA (Polymethyl Methacrylate, polymethyl methacrylate), PET (Polyethylene Terephthalate, polyethylene terephthalate) Diol ester), PP (Polypropylene, polypropylene), any of PE (Polyethylene, polyethylene). In a possible embodiment, the second skin 300 can be made of the same material as the optical film. In a possible embodiment, the second skin 300 is selected with reference to the materials in Table 1. The 300 adopts a material with the same thermal expansion coefficient as the material used in the optical film or with a smaller difference, and the material is a plastic or a composite material.

In other embodiments, the display function layer 001 is a black screen, and the material of the black screen is PEN (Polyethylene Naphthalate Two Formic Acid Glycol Ester, polyethylene naphthalate), PA (Polyamide, nylon), PS Any of (Polystyrene, polystyrene), EVA (Ethylene Vinyl Acetate Copolymer, ethylene-vinyl acetate copolymer). In a possible embodiment, the second skin 300 can be made of the same material as the black screen. In a possible embodiment, the second skin 300 is selected with reference to the materials in Table 1. The 300 uses a material with the same thermal expansion coefficient as the material used in the black screen or a smaller difference.

In addition, in some embodiments, the display functional layer 001 is a white plastic curtain, and the material of the white plastic curtain is PVC (Polyvinyl Chlorid, polyvinyl chloride). In a possible embodiment, the second skin 300 can be made of the same material as PVC. A material with the same thermal expansion coefficient as PVC or a smaller difference.

Table 1 shows the material used in the functional layer 001-thermal expansion coefficient comparison table

As for the materials used for other layers in the projection screen 010, the material of the first skin 200 is any one of plastic, aluminum, aluminum-plastic panel, steel, and carbon fiber composite panel, which is light in material and high in structural strength. When the projection screen 010 is a non-sound projection screen, the first skin 200 is usually made of an aluminum plate.

In some embodiments, the above-mentioned support layer is the aluminum honeycomb core or PP honeycomb core mentioned in the above-mentioned embodiments of the present application, which has low cost and high strength.

The material in the existing projection screen has a certain thickness so that the strength and flatness can be maintained when the high temperature and high humidity environment changes. For example, the support layer needs to use an aluminum honeycomb panel with a thickness of more than 10 mm. However, the structural design of the projection screen 010 in the above-mentioned embodiment of the present application ensures that the flatness of the projection screen 010 is relatively high in a high temperature and high humidity environment. Realize ultra-thin screen.

Based on the above, the thickness of the display function layer 001 in the projection screen 010 of some embodiments of the present application is 0.5-1.7 mm, the thickness of the first skin 200 is 0.5-1.5 mm, the thickness of the supporting layer is 5-8 mm, and the thickness of the second skin 200 is 0.5-1.5 mm. The thickness of the skin 300 is 0.5-1.7 mm, the thickness of the first adhesive layer 400 between the first skin 200 and the support layer, and the thickness of the second adhesive layer 500 between the second skin 300 and the support layer are 0.1-2mm, the minimum value of the thickness of each layer of the screen structure is reduced, and the thickness of each layer of the screen structure has a large value range, which can meet the design needs of different projection screens 010; and it is guaranteed in high temperature and high humidity environment On the basis of the flatness and optical effect of the projection screen 010, the projection screen 010 can be thinned and reduced in weight, and has a beautiful appearance and is easy to carry and install.

On the one hand, an embodiment of the present application further provides a laser projection system, and the projection device includes a laser projection device and the projection screen described in the above embodiments. Since the structure of the projection screen used in the laser projection system of the embodiment of the present application is the same as that of the projection screen described in the above-mentioned embodiment, the two can obtain the same technical effect, which is not repeated here.

In this application, the terms "first" and "second" are used for descriptive purposes only, and should not be construed to indicate or imply relative importance. The term "plurality" refers to two or more, unless expressly limited otherwise.

The above are only optional embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of the present application. within the scope of protection.

Claims

A sounding board, comprising:

a honeycomb core layer, and a first skin and a second skin on both sides of the honeycomb core layer, the first skin and the second skin are both connected to the honeycomb core layer;

The honeycomb core layer includes: a first sub-honeycomb core layer, and two second sub-honeycomb core layers located on both sides of the first sub-honeycomb core layer, and the two second sub-honeycomb core layers are the first sub-honeycomb core layers are connected;

Wherein, the thickness of the first sub-honeycomb core layer is greater than the thickness of the second sub-honeycomb core layer, and the side of the first sub-honeycomb core layer in contact with the first skin and the second sub-honeycomb layer The surface in contact with the first skin is coplanar.
The sounding board of claim 1, wherein,

The first sub-honeycomb core layer has a plurality of first honeycomb cores with the same shape, the second sub-honeycomb core layer has a plurality of second honeycomb cores with the same shape, and each of the first honeycomb cores is in the second honeycomb core. The orthographic projection on a skin is a first ring shape, the orthographic projection of each of the second honeycomb cores on the first skin is a second ring shape, and the inner ring size of the first ring shape is smaller than the size of the first ring shape The inner ring size of the two rings.
The sounding board of claim 2, wherein,

The first honeycomb core and the second honeycomb core are both hexagonal honeycomb cores, the first annular shape and the second annular shape are both hexagonal annular shapes, and the inner side length of the first annular shape is smaller than the length of the first annular shape. The length of the inner side of the second ring.
The sounding board of claim 2, wherein

The wall thickness of the first honeycomb core is greater than the wall thickness of the second honeycomb core.
The sounding board of claim 1, wherein,

The range of the thickness of the first sub-honeycomb core layer is: 8 to 15 mm;

The thicknesses of the two second sub-honeycomb core layers are both in the range of 5 to 8 mm; or, the thicknesses of the two second sub-honeycomb core layers are in the range of 2 to 5 mm; or, the The thickness of one of the two second subcellular core layers is in the range: 5 to 8 mm, and the thickness of the other second subcellular core layer is in the range: 2 to 5 mm.
The sounding board of claim 3, wherein,

The range of the inner side length of the first ring is: 2 to 5 mm, and the range of the inner side length of the second ring is: 2 to 10 mm.
The sounding board of claim 1, wherein,

The sound-emitting panel further includes: an isolation plate between the first sub-honeycomb core layer and each of the second sub-honeycomb core layers, and the first sub-honeycomb core layer and the second sub-honeycomb core layer The layers are all connected to the isolation plate.
The sounding board of claim 7, wherein,

The sounding plate is in the shape of a rectangular plate;

The two second sub-honeycomb core layers and the first sub-honeycomb core layer located between the two second sub-honeycomb core layers are arranged along the direction of the long side of the rectangle;

Alternatively, the two second sub-honeycomb core layers and the first sub-honeycomb core layer located between the two second sub-honeycomb core layers are arranged along the direction of the rectangular short plate;

Alternatively, the orthographic projection of the first sub-honeycomb core layer on the first skin is an isosceles triangle, and the base of the isosceles triangle is coincident with a long side of the rectangle, and each of the second sub-honeycomb core layers is an isosceles triangle. The orthographic projection of the honeycomb core layer on the first skin is a right-angled triangle, and one right-angled side of the right-angled triangle coincides with one short side of the rectangle, and the other right-angled side coincides with the other long side of the rectangle.
The sounding board of claim 8, wherein,

The area of the orthographic projection of each of the second sub-honeycomb core layers on the first skin is the same.
A projection screen, comprising:

A sounding board, the sounding board comprises: the sounding board according to any one of claims 1 to 9;

a display function layer, the display function layer is connected to the side of the first skin in the sound-emitting panel away from the honeycomb core layer;

And, an exciter, the exciter is connected to the side of the second skin of the sounding board away from the honeycomb core layer, and the exciter is used to drive the sounding board to vibrate to emit sound.