CN112526814A - Projection screen and laser projection system - Google Patents

Projection screen and laser projection system Download PDF

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Publication number
CN112526814A
CN112526814A CN202011430213.XA CN202011430213A CN112526814A CN 112526814 A CN112526814 A CN 112526814A CN 202011430213 A CN202011430213 A CN 202011430213A CN 112526814 A CN112526814 A CN 112526814A
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China
Prior art keywords
layer
projection screen
skin layer
sub
honeycomb core
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CN202011430213.XA
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CN112526814B (en
Inventor
邢哲
戴洁
魏伟达
徐虹哲
崔雷
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Qingdao Hisense Laser Display Co Ltd
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Qingdao Hisense Laser Display Co Ltd
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Publication of CN112526814A publication Critical patent/CN112526814A/en
Priority to PCT/CN2021/129206 priority patent/WO2022121590A1/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/565—Screens allowing free passage of sound

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

The application discloses projection screen and laser projection system relates to projection equipment technical field for solve among the prior art projection screen and produce the screen easily and split glue or can't resume the problem of deformation when the humiture changes greatly. The projection screen comprises an optical function layer, a first skin layer, a supporting layer and a second skin layer which are sequentially stacked; the first skin layer and the second skin layer are used for wrapping the supporting layer, and the first skin layer is connected with the optical function layer; the coefficient of thermal expansion of the material of the optically functional layer is the same as or different from the coefficient of thermal expansion of the material of the second skin layer by 0.5 x 10‑5m/(m.k) or less. The projection screen is used for receiving and displaying a projection picture of a projector.

Description

Projection screen and laser projection system
Technical Field
The application relates to the technical field of projection equipment, in particular to a projection screen and a laser projection system.
Background
In recent years, display screens of various electronic devices such as mobile phones, tablet computers, laptop computers, laser televisions and the like are screen products with multilayer composite structures, and the thermal expansion coefficients of the structures of the layers are different due to different materials.
Taking the projection screen as an example, when the projection screen has large temperature or humidity change, the expansion and contraction amounts of the structures of each layer are different, and the structures cannot expand or contract freely, so that internal stress generated between the structures of each layer can cause the screen to be cracked or generate unrecoverable deformation, and the optical effect and the flatness of the projection screen are influenced; in the case of a sound projection screen, the optical diaphragm and the aluminum honeycomb plate are bonded together, and the internal stress generated between the optical diaphragm and the aluminum honeycomb plate can also affect the acoustic effect of the sound projection screen.
Disclosure of Invention
The embodiment of the application provides a projection screen and a laser projection system, which are used for solving the problem that the projection screen is easy to generate screen glue failure or cannot recover deformation when the temperature and humidity change is large in the prior art.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, an embodiment of the present application provides a projection screen, including an optical function layer, a first skin layer, a support layer, and a second skin layer, which are sequentially stacked; the first skin layer and the second skin layer are used for wrapping the supporting layer, and the first skin layer is connected with the optical function layer; the coefficient of thermal expansion of the material of the optically functional layer is the same as or different from the coefficient of thermal expansion of the material of the second skin layer by 0.5 x 10-5m/(m.k) or less.
In some possible embodiments of the present application, the optically 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 optically 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 optical function 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 layer is bonded to the optically functional layer and the support layer, respectively; and/or the second skin layer is bonded to the support layer.
In some possible embodiments of the present application, the optically functional layer has a thickness of 0.5 to 1.7 mm; and/or the thickness of the bonding layer between the first skin layer and the optical function layer is 0.1-1 mm; and/or the thickness of the first skin layer is 0.5-1.5 mm; and/or the thickness of the supporting layer is 5-8 mm; and/or the thickness of the second skin layer is 0.5-1.7 mm; and/or the thickness of the bonding layer between the first skin layer and the supporting layer and the thickness of the bonding layer between the second skin layer and the supporting layer are both 0.1-2 mm.
In some possible embodiments of the present application, the support layer further comprises an actuator, and the actuator is installed on a side of the second skin layer away from the support layer.
In some possible embodiments of the present application, the material of the first skin layer is any one of plastic, aluminum-plastic plate, steel, and carbon fiber composite plate.
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, the first sub-honeycomb core is located in the middle of the support layer, the second sub-honeycomb core is located in a region of the support layer near the edge, and the density of the first sub-honeycomb core is greater than that of the second sub-honeycomb core.
In some possible embodiments of the present application, the support layer further comprises an insulating support plate connecting the first sub-honeycomb core and the second sub-honeycomb core.
Compared with the prior art, when the external temperature or humidity changes greatly, the optical function layer and the second skin layer positioned on the outer layer in the projection screen of the embodiment of the application are deformed, and the thermal expansion coefficient of the material adopted by the optical function layer and the thermal expansion coefficient of the material adopted by the second skin layer are differentThe materials used have the same or different thermal expansion coefficients of 0.5X 10-5The difference is smaller, so that the internal stress generated by the optical function layer and the second skin layer is basically the same or the difference is smaller, the acting forces on two sides of the internal first skin layer and two sides of the internal supporting layer are basically the same or the difference is smaller, the optical function layer, the first skin layer, the supporting layer and the second skin layer can be simultaneously deformed and can freely expand or contract, the screen split or unrecoverable deformation caused by different expansion or contraction of each layer structure in the projection screen is reduced, and the optical effect and the flatness stability of the projection screen are higher; and to the scheme that the projection screen of this application embodiment is vocal projection screen, can also be more stable when the acoustic effect of vocal projection screen when appearing expend with heat and contract with cold.
In a second aspect, an embodiment of the present application further provides a laser projection system, where the projection apparatus includes a laser projection device and the projection screen described in the foregoing embodiment. Since the projection screen used in the laser projection system of the embodiment of the present application has the same structure as the projection screen described in the above embodiment, the two can obtain the same technical effect, and details are not repeated here.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a projection screen according to an embodiment of the present disclosure;
FIG. 2 is an exploded view of a projection screen of an embodiment of the present application;
FIG. 3 is an exploded view of a portion of a projection screen according to an embodiment of the present disclosure;
FIG. 4 is a second exploded view of a portion of a projection screen according to an embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of a support layer in a projection screen according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a first distribution of a support layer in a projection screen according to an embodiment of the present disclosure;
FIG. 7 is a diagram illustrating a second distribution of a support layer in a projection screen according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of a third distribution of support layers in a projection screen according to an embodiment of the present disclosure;
FIG. 9 is a schematic diagram of a structure of a honeycomb of a support layer in a projection screen according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a laser projection system according to an embodiment of the present application.
Reference numerals:
100-a projection screen; 200-a laser projection system; 1-an optically functional layer; 2-a first skin layer; 3-a support layer; 30-a support assembly; 31-a first sub-honeycomb core; 32-a second sub-honeycomb core; 33-an isolated support plate; 4-a second skin layer; 5-a frame; 6-cover plate; 7-hanging the bracket; 8-a first damping member; 9-an exciter; 10-a first tie layer; 11-a second adhesive layer; 12-a third tie layer; a support plate 13; and a second shock absorbing member 14.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the description of the present application, "and/or" is only one kind of association relationship describing an associated object, and means that three kinds of relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Referring to fig. 1 to 3, a projection screen 100 according to an embodiment of the present disclosure includes an optically functional layer 1, a support assembly 30, a frame 5, a cover plate 6, a suspension bracket 7, a first shock absorbing member 8, an actuator 9, a first adhesive layer 10, a support plate 13, and a plurality of second shock absorbing members 14.
The optical function layer 1 is used for receiving and displaying a projection picture of a projector, and the optical function layer 1 is any one of a circular Fresnel optical film, a black grid screen and a white plastic screen.
The supporting component 30 is composed of a first skin layer 2, a supporting layer 3 and a second skin layer 4 which are sequentially stacked, that is, the first skin layer 2 and the second skin layer 4 are respectively wrapped on two sides of the supporting layer 3, as shown in fig. 4; the first skin layer 2 and the support layer 3 can ensure the flatness of the optical function layer 1 to ensure the optical effect. The support layer 3 may be a honeycomb core, which can reduce the thermal expansion of the projection screen 100, and has excellent properties of light weight, high strength, large rigidity, high wind pressure resistance, shock absorption, sound insulation, heat preservation, flame retardancy, high specific strength, and the like.
When the supporting layer 3 is a honeycomb core, the supporting component 30 forms a sound-emitting panel, one side of the first skin layer 2, which is far away from the supporting layer 3, is connected with the optical function layer 1, and a structure formed by connecting the optical function layer 1 with the supporting component 30 is called a sound-emitting screen. Of course, the support member 30 may be a non-sound-emitting panel, and the following description will be given taking the support structure as a sound-emitting panel as an example.
The exciter 9 is connected to the side of the second skin 4 of the support assembly 30 remote from the honeycomb core, and the exciter 9 is used to vibrate the sound-emitting panel to emit sound. The exciter 9 in the embodiment of the present application is an electromagnetic excitation energy converter.
Illustratively, the actuators 9 in the projection screen may be electrically connected to a laser projection device that, in operation, sends acoustic electrical signals to the actuators 9. The exciter 9 may perform a reciprocating motion based on the sound electrical signal after receiving the sound electrical signal, so that the entire surface of the sound board may vibrate together, so that the sound board may sound, and the projection screen 100 may generate sound when the laser projection apparatus is in operation.
The first adhesive layer 10 bonds the optically functional layer 1 and the first skin layer 2. The first adhesive layer 10 may be an adhesive such as glue, an adhesive film, or a double-sided adhesive. The thickness of the first adhesive layer 10 may range from 0.1 mm to 1 mm. For example, the thickness of the first adhesive layer 10 may be 0.5 mm.
The above-mentioned frame 5 can be connected to the edge of the sound screen consisting of the optically functional layer 1 and the support assembly 30. By way of example, the frame 5 may be a generally annular frame that matches the shape of the sound screen formed by the optically functional layer 1 and the support assembly 30.
The sound screen formed by the optically functional layer 1 and the support assembly 30 in the projection screen 100 may have a rectangular plate shape, and the frame 5 in the projection screen may include: and four strip structures which correspond to the four edges of the sound production screen one by one. The four strip-shaped structures are sequentially connected end to form a rectangular frame body matched with the sound production screen in shape. For example, any two adjacent strip-shaped structures may be connected by an L-shaped connector, and the connector may be fastened to the strip-shaped structures by screws. The frame 5 in the projection screen can be made of plastic, aluminum alloy or magnesium alloy. In this application, every strip structure has the joint groove, and every strip structure can with the marginal joint that corresponds in the sound production screen to realize being connected between frame 5 and the sound production screen.
In the embodiment of the present application, when the exciter 9 in the projection screen 100 works, the exciter 9 can drive the sound board to generate physical displacement and deformation, so that the sound board generates sound. Since the sound-emitting panel is bonded to the optical function layer 1, the sound-emitting panel applies a force to the optical function layer 1 when the sound-emitting panel is physically displaced and deformed. When the optical function layer 1 is acted by the sound-emitting plate, the contact part of the optical function layer 1 and the frame 5 is easily damaged. For this reason, the first damper 8 is provided at a position where the frame 5 contacts the optical function layer 1, and the probability of damage occurring when the portion of the optical function layer 1 contacting the frame 5 is subjected to the force of the sound-emitting panel can be reduced by this first damper 8. For example, the first shock absorbing member 8 may be a shock absorbing pad having the same shape as the frame 5, and the material of the first shock absorbing member 8 may be a damping material such as butyl rubber or polyurethane foam.
The cover plate 6 is strip-shaped, two ends of the cover plate 6 are respectively connected with the upper edge and the lower edge of the frame 5, the exciter 9 is positioned between the sounding board and the cover plate 6, and the exciter 9 is connected with the cover plate 6. The cover plate 6 may serve as a support reinforcement on the frame 5 and may serve to shield the exciter 9.
The number of the cover plates 6 in the projection screen 100 may be two, and the support plate 13 is located between the two cover plates 6, and the support plate 13 is a strip. Both ends of the supporting plate 13 may be connected to the frame 5. The support plate 13 can support the sound board in the projection screen 100, so as to prevent the sound board from collapsing in the center, thereby improving the stability of the projection screen.
For example, the length directions of the two cover plates 6 and the length direction of the support plate 13 in the projection screen 100 are parallel, and both ends of each cover plate 6 and both ends of the support plate 13 may be connected to the frame 5 by screws. Optionally, a shock absorbing structure is disposed at a position where both ends of each cover plate 6 contact the frame 5 and a position where both ends of the supporting plate 7 contact the frame 5. The shock absorption structure can be a shock absorption pad, and the thickness of the shock absorption pad can range from 0.5 mm to 0.8 mm; the material of the shock absorption structure can comprise acrylic acid sub-sensitive adhesive tape, similar adhesive tape, silica gel pad or foam and the like. This shock-absorbing structure can reduce the sound board under the effect of vibration, leads to appearing the collision between apron 6 and the frame 5 and produce the probability of noise, further improvement the audio of the sound that projection screen made.
The above-mentioned exciter 9 is a plurality of exciters 9, and the plurality of exciters 9 are all located between the cover plate 6 and the sound generating plate in the projection screen 100, and all can be bonded with the cover plate 6 through a shock-absorbing bonding layer, so as to realize the fastening connection between the exciters 9 and the cover plate 6 in the display device.
For example, when the exciter 9 is bonded to the cover plate 6 through the vibration-damping adhesive layer, hard contact between the exciter 9 and the cover plate 6 can be prevented, and an acting force applied to the cover plate 6 by the exciter 9 in the working process is reduced, so that the probability of the mechanical vibration phenomenon of the cover plate 6 in the working process of the exciter 9 is reduced, the volume of noise generated when the mechanical vibration phenomenon occurs to the cover plate 6 can be reduced, and the sound effect of the sound generated by the projection screen is improved.
The suspension bracket 7 may include a sheet-shaped hook connected to the frame 5 and a sheet-shaped fixing portion connected to the hook, and the fixing portion may be fixedly connected to the wall by a fastening screw. The hanging bracket 7 may enable the projection screen 100 to be hung on a wall. Alternatively, the material of the suspension bracket 7 may include plastic, aluminum-plastic plate, steel or carbon fiber composite plate, etc.
The plurality of second shock absorbing members 14 are disposed at a portion where the suspension bracket 7 contacts the frame 5, and the second shock absorbing members 14 are shock absorbing pads, and the thickness of the shock absorbing pads may range from 0.5 mm to 0.8 mm. The material of the shock pad can comprise acrylic acid sub-sensitive adhesive tape, similar adhesive tape, silica gel pad or foam cotton and the like. This shock pad has improved the stability that this projection screen hung on the wall, simultaneously, can also reduce the sound board under the effect of vibration, leads to appearing the collision between suspension bracket 7 and the frame 5 and produce the probability of noise, further improvement the audio of the sound that the projection screen made.
The coefficient of thermal expansion of the material used for the optically functional layer 1 is the same as or different from the coefficient of thermal expansion of the material used for the second skin layer 4 by 0.5 × 10-5m/(m.k) (m/m.Kelvin).
Compared with the prior art, when the external temperature or humidity changes greatly, the optical function layer 1 and the second skin layer 4 located at the outer layers in the projection screen 100 of the embodiment of the present application both deform due to the heat of the material used for the optical function layer 1The coefficient of expansion is the same as or different from the coefficient of thermal expansion of the material used for the second skin layer 4 by 0.5 x 10-5The difference is smaller than m/(m · k), so that the internal stresses generated by the optical functional layer 1 and the second skin layer 4 are basically the same or the difference is smaller, and the acting forces on two sides of the internal first skin layer 2 and two sides of the internal support layer 3 are basically the same or the difference is smaller, so that the optical functional layer 1, the first skin layer 2, the support layer 3 and the second skin layer 4 can be simultaneously deformed and can freely expand or contract, thereby reducing screen split or unrecoverable deformation caused by different expansion or contraction of each layer structure in the projection screen 100, and ensuring that the optical effect and the flatness stability of the projection screen 100 are higher; in addition, for the scheme that the projection screen 100 of the embodiment of the application is a sound-producing projection screen, the acoustic effect of the sound-producing projection screen is stable when expansion with heat and contraction with cold occur.
The first skin layer 2 and the support layer 3 are bonded to each other by the second adhesive layer 11, and the bonding force is strong. Similarly, the second skin layer 4 is connected to the support layer 3 by the third adhesive layer 12
The materials used differ for the different optically functional layers 1.
In some embodiments, the optically functional layer 1 in the projection screen 100 is an optical film, and the material of the optical film is any one of PMMA (Polymethyl Methacrylate), PET (Polyethylene Terephthalate), PP (Polypropylene), and PE (Polyethylene). The second skin layer 4 may be made of the same material as the optical film, or referring to table 1, the second skin layer 4 may be made of a material having the same or a smaller difference in thermal expansion coefficient than the material used for the optical film, and the material may be a plastic or a composite material.
In other embodiments, the optical function layer 1 is a black screen, and the material of the black screen is any one of PEN (Polyethylene terephthalate Two carboxylic Acid Glycol Ester), PA (Polyamide, nylon), PS (Polystyrene), and EVA (Ethylene Vinyl Acetate Copolymer). The second skin layer 4 may be made of the same material as the black screen, or, referring to table 1, the second skin layer 4 may be made of a material having the same or a smaller difference in thermal expansion coefficient from the material used for the black screen.
Further, in some embodiments, the optically functional layer 1 is a white plastic screen made of PVC (Polyvinyl chloride) and the optically functional layer 1 is an optically functional layer 1. The second skin layer 4 may be made of PVC, or referring to table 1, the second skin layer 4 may be made of a material having the same or a smaller difference in thermal expansion coefficient from PVC.
Figure BDA0002826410120000081
TABLE 1 comparison table of coefficient of thermal expansion of material used for optical functional layer 1
For the materials used for the other layers in the projection screen 100, the material of the first skin layer 2 is any one of plastic, aluminum-plastic plate, steel and carbon fiber composite plate, and the material is light and the structural strength is high. For projection screen 100 to be a non-sound projection screen, aluminum sheet is often used for first skin layer 2. The supporting layer 3 is an aluminum honeycomb core or a PP honeycomb core, and is low in cost and high in strength.
The existing projection screen has a certain thickness of material, so that the strength and the flatness can be maintained when the high-temperature and high-humidity environment changes, for example, the supporting layer 3 needs to adopt an aluminum honeycomb plate with the thickness of more than 10 mm. However, the structural design of the projection screen 100 according to the embodiment of the present application ensures that the flatness of the projection screen 100 is high in a high-temperature and high-humidity environment, so that the thickness of the projection screen 100 according to the embodiment of the present application can be designed to be thin, so as to realize an ultra-thin screen.
Based on the above, in the projection screen 100 of the embodiment of the present application, the thickness of the optical function layer 1 is 0.5 to 1.7mm, the thickness of the first skin layer 2 is 0.5 to 1.5mm, the thickness of the support layer 3 is 5 to 8mm, the thickness of the second skin layer 4 is 0.5 to 1.7mm, the thickness of the second bonding layer 11 between the first skin layer 2 and the support layer 3, and the thickness of the third bonding layer 12 between the second skin layer 4 and the support layer 3 are 0.1 to 2mm, the minimum value of the thickness of each screen structure is reduced, and the value range of the thickness of each screen structure is large, so that the design requirements of different projection screens 100 can be met; and on the basis of guaranteeing the roughness and the optical effect of projection screen 100 under high temperature and high humidity environment, can realize the attenuate of projection screen 100 and subtract heavy to the appearance is pleasing to the eye, is convenient for carry the installation.
Continuing with the example of the above-mentioned support layer 3 as a sound-emitting panel, referring to fig. 4 and 5, the support layer 3 includes a first sub-honeycomb core 31 and two second sub-honeycomb cores 32, the first sub-honeycomb core 31 is located between the two second sub-honeycomb cores 32, and a surface of the first sub-honeycomb core 31 contacting the first skin layer 2 is coplanar with surfaces of the two second sub-honeycomb cores 32 contacting the first skin layer 2. Therefore, the first skin layer 2 in the sound-emitting panel can satisfy the optical flatness of the optically functional layer 1 bonded thereto.
Of course, the number of the first sub-honeycomb cores 31 is not limited to one, and may be plural; the number of the second sub-honeycomb cores 32 is not limited to two, and may be one or more than three. In the following, one first sub-honeycomb core 31 and two second sub-honeycomb cores 32 are taken as examples.
There are many possible implementations of the above-mentioned position of the orthographic projection of the plurality of exciters 9 on the second skin 4 in the sound board. The embodiment of the present application is schematically illustrated by taking the following three possible implementation manners as examples:
in a first possible implementation, the orthographic projection of the plurality of exciters 9 on the honeycomb core in the sound-emitting panel may be located in the area of the first sub-honeycomb core 31 in the honeycomb core.
In a second possible implementation, the orthographic projections of the plurality of exciters 9 on the second skin 4 may be located within the orthographic projection of the second sub-honeycomb core 32 in the honeycomb core on the second skin 4.
In a third possible implementation, the orthographic projections of the plurality of actuators 9 on the second skin 4 may be partially located within the orthographic projection of the first sub-honeycomb core 31 in the honeycomb core on the second skin 4, and partially located within the orthographic projection of the second sub-honeycomb core 32 in the honeycomb core on the second skin 4.
In the projection screen, since the frame 5 is connected to the edge of the sound screen composed of the optical functional layer 1 and the support layer 3, the stress at the edge of the sound screen is small, and the stress concentration phenomenon occurs in the central area of the sound screen. In this embodiment, the density of the first sub-honeycomb core 31 is greater than the densities of the two second sub-honeycomb cores 32, so that the first sub-honeycomb core 31 can effectively alleviate the stress concentration phenomenon in the central area of the projection screen, and plays a certain supporting role in the central area of the sound screen, thereby reducing the probability of deformation of the central area of the sound screen, further ensuring the optical flatness of the optical function layer 1, and improving the display effect of the projection screen.
Similarly, the thickness of the first sub-honeycomb core 31 located in the central area of the sound-emitting panel is greater than the thickness of the second sub-honeycomb cores 32 located on both sides of the sound-emitting panel, so that the stress concentration phenomenon in the central area of the projection screen is further alleviated, and the probability of deformation of the central area of the sound-emitting screen is reduced.
It should be noted that the thicknesses of the two second sub-honeycomb cores 32 may be the same or different.
For example, in some embodiments of the present application, the thickness of the first sub-honeycomb core 31 ranges from 8 to 15mm, the thickness of one second sub-honeycomb core 32a ranges from 5mm to 8mm, and the thickness of the other second sub-honeycomb core 32b ranges from 2 to 5mm, so as to meet different working condition requirements.
Fig. 6 shows an example of the first distribution mode of the support layer 3, the first sub-honeycomb core 31 and the two second sub-honeycomb cores 32 are both rectangular, and one second sub-honeycomb core 32a, the first sub-honeycomb core 31, and the other second sub-honeycomb core 32b in the support layer 3 are distributed in sequence along the horizontal direction, which is better for improving the deformation of the rectangular support layer 3 toward the center in the width direction.
Fig. 7 shows an example of the second distribution mode of the support layer 3, the first sub-honeycomb core 31 and the two second sub-honeycomb cores 32 are both rectangular, and one second sub-honeycomb core 32a, the first sub-honeycomb core 31, and the other second sub-honeycomb core 32b in the support layer 3 are distributed in sequence along the vertical direction, which is better for improving the deformation of the rectangular support layer 3 toward the center in the length direction.
Fig. 8 shows an example of a third distribution manner of the support layer 3, where the first sub-honeycomb core 31 and the two second sub-honeycomb cores 32 are both triangular, one second sub-honeycomb core 32a, the first sub-honeycomb core 31, and the other second sub-honeycomb core 32b in the support layer 3 are sequentially distributed along the horizontal direction, the first sub-honeycomb core 31 is an isosceles triangle, the two second sub-honeycomb cores 32 are both right-angled triangles, the area of the first sub-honeycomb core 31 is larger than the area of the two second sub-honeycomb cores 32, the first sub-honeycomb core 31 can enhance flatness and support, and the two second sub-honeycomb cores 32 can reduce weight and improve acoustic effect.
In some embodiments, the honeycomb cells of the honeycomb core are any one of hexagonal, rectangular, square, bell-shaped, sinusoidal, diamond-shaped, double bell-shaped, tubular honeycomb. Taking the honeycomb holes of the honeycomb core as an example, the side length of the honeycomb holes of the first sub-honeycomb core 31 is smaller than that of the honeycomb holes of the second sub-honeycomb core 32, for example, the side length of the honeycomb holes of the first sub-honeycomb core 31 is in a range of 2-5 mm, the side length of the honeycomb holes of the two second sub-honeycomb cores 32a and 32b is in a range of 2-10 mm, the smaller the side length of the honeycomb holes is, the greater the relative density of the honeycomb holes is, and thus the density of the honeycomb holes of the first honeycomb core 31 is greater than that of the honeycomb holes of the two second sub-honeycomb cores 32.
The value range of the angle difference between any two adjacent honeycomb holes in 6 internal angles of the first honeycomb core 31 is 0-10 degrees, for example, the value range of the angle difference between the angle alpha and the angle beta in fig. 9 is 0-10 degrees, and the directivity and the frequency response range of the sound-emitting plate are adjusted by adjusting the value range of the angle difference between any two adjacent honeycomb holes, so as to meet the actual sound-emitting requirement.
In some embodiments of the present application, the support layer 3 further includes an isolation support plate 33, the isolation support plate 33 connects the first sub-honeycomb core 31 and the second sub-honeycomb core 32, the isolation support plate 33 improves the connection strength of the first sub-honeycomb core 31 and the second sub-honeycomb core 32, reduces deformation of the first sub-honeycomb core 31 and the second sub-honeycomb core 32 to ensure the flatness of the support layer 3, and the isolation support plate 33 enables the isolation between the first sub-honeycomb core 31 and the second sub-honeycomb core 32 to be good.
Above-mentioned isolation backup pad 33 can adopt aluminum plate, keeps apart the effect better. Referring to fig. 5, if the thickness T of the isolation supporting plate 33 is too large, the first skin layer 2 and the second skin layer 4 are prone to be uneven when the sound-emitting panel works, and the flatness of the projection screen 100 is poor; if the thickness of the insulating support plate 33 is too small, the supporting strength for the first skin layer 2 and the second skin layer 4 is low, and the insulating degree between the first sub-honeycomb core 31 and the second sub-honeycomb core 32 is poor. Therefore, the thickness T of the isolation support plate 33 in the embodiment of the present application is 0.1-1 mm, such as 0.8mm for the isolation support plate 33.
Referring to fig. 10, an embodiment of the present application further includes a laser projection system, which includes a laser projection device 200 and the projection screen 100 according to the above embodiment, the laser projection device 200 projects a projection picture on the projection screen 100, and the laser projection device 200 may be electrically connected to the exciter 9 in the projection screen 100. Since the projection screen used in the laser projection system of the embodiment of the present application has the same structure as the projection screen 100 described in the above embodiment, the two can obtain the same technical effect, and details are not repeated here.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A projection screen is characterized by comprising an optical function layer, a first skin layer, a supporting layer and a second skin layer which are sequentially stacked;
the first skin layer and the second skin layer are used for wrapping the supporting layer, and the first skin layer is connected with the optical function layer;
the coefficient of thermal expansion of the material of the optically functional layer is the same as or different from the coefficient of thermal expansion of the material of the second skin layer by 0.5 x 10-5m/(m.k) or less.
2. The projection screen of claim 1 wherein the optically functional layer is an optical film made of any one of PMMA, PET, PP, and PE;
or the optical function layer is a black grid screen, and the material of the black grid screen is any one of PEN, PA, PS and EVA;
or the optical function layer is a white plastic screen made of PVC.
3. The projection screen of claim 1 or 2 wherein the first skin layer is bonded to the optically functional layer, the support layer, respectively; and/or the second skin layer is bonded to the support layer.
4. The projection screen of claim 3 wherein the optically functional layer has a thickness of 0.5 to 1.7 mm;
and/or the thickness of the bonding layer between the first skin layer and the optical function layer is 0.1-1 mm;
and/or the thickness of the first skin layer is 0.5-1.5 mm;
and/or the thickness of the supporting layer is 5-8 mm;
and/or the thickness of the second skin layer is 0.5-1.7 mm;
and/or the thickness of the bonding layer between the first skin layer and the supporting layer and the thickness of the bonding layer between the second skin layer and the supporting layer are both 0.1-2 mm.
5. The projection screen of claim 1 or 2, further comprising:
an actuator mounted on a side of the second skin layer remote from the support layer.
6. The projection screen of claim 1 or 2 wherein the material of the first skin layer is any one of plastic, aluminum plastic panel, steel, carbon fiber composite panel.
7. The projection screen of claim 1 or 2 wherein the support layer is an aluminum honeycomb core or a PP honeycomb core.
8. The projection screen of claim 1 or 2 wherein the support layer is a honeycomb core and the support layer is comprised of a first sub-honeycomb core and a second sub-honeycomb core, the first sub-honeycomb core being located in the middle of the support layer and the second sub-honeycomb core being located in the area of the support layer near the edge, the density of the first sub-honeycomb core being greater than the density of the second sub-honeycomb core.
9. The projection screen of claim 8, wherein the support layer further comprises an insulating support plate connecting the first subcellular core with the second subcellular core.
10. A laser projection system comprising a laser projection device and a projection screen as claimed in any one of claims 1 to 9.
CN202011430213.XA 2020-12-09 2020-12-09 Projection screen and laser projection system Active CN112526814B (en)

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PCT/CN2021/129206 WO2022121590A1 (en) 2020-12-09 2021-11-08 Sound generation board and projection screen

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JPH0792564A (en) * 1993-09-20 1995-04-07 Mitsubishi Electric Corp Structure for attaching screen of projection television
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