Sound screen for projectors

Abstract

The present invention relates to a sound screen for a projector, and relates to a sound screen for a projector comprising: a screen plate modified to increase the surface roughness of the front surface; a back plate configured on the rear surface of the screen plate; and a vibration device configured on the rear surface of the back plate to vibrate the back plate.

Description

[Technical field]

[0001] The present invention relates to a sound screen for a projector, and more specifically, to a projector screen configured to function as a speaker, particularly as a center speaker and front speakers in multi-channel sound, thereby achieving improved sound effects. In particular, the present invention relates to a sound screen for projectors that increases the surface roughness of the screen to provide a wide viewing angle and high brightness characteristics, and applies a sound-absorbing structure to reduce reverberation phenomena such as vibration and resonance within the enclosure caused by screen vibration, thereby minimizing image shaking and audio interference caused by excessive screen vibration, thereby significantly improving image and audio quality. [Background technology]

[0002] Generally, in the case of a large-scale movie theater such as a movie theater, a large screen is set up in front, and a large number of audience members sit in seats arranged radially around the screen to watch the images projected on the screen, and directional speakers are placed behind the screen to output center sound. Here, center sound refers to sound output from the center in front of the audience, and is combined with front sound output from the front side and rear sound output from the rear side to form a multi-channel sound signal. Since the center sound output from such a directional speaker is output from behind the screen toward the screen, there is a problem that some of the sound is reflected by the screen or the screen reverberates, reducing the sound effect.

[0003] To solve this problem, a part of the screen where the directional speaker is located can be cut (perforated) so that the sound output from the speaker can be smoothly transmitted to the front of the screen. However, this may cause loss of image at the cutout part of the screen. In addition, since the sound emitted forward through the cutout is directed in a certain direction, audience members who are positioned outside the directivity angle of the sound may hear the sound relatively quieter than the other sounds (front and rear sounds), which can cause a problem in that the overall sound balance is reduced. In the worst case, a blind spot may be created where the center sound cannot be heard at all.

[0004] Recently, there has been an increasing demand for quality improvement in personal leisure time, and people who are interested in video media such as movies are setting up home theaters to get the same experience of watching movies at home as if they were in a movie theater. Such home theaters mainly use a projector to project images, and the projector screen used in this case reflects or projects the image emitted from the projector so that the viewer (user) positioned in front can see the image.

[0005] Meanwhile, in the case of a home theater, the center speaker that outputs the center sound from the multi-channel sound signal is usually placed under the projector screen, but due to a difference in height with the front and rear speakers, there can be a problem of reduced sound effects. In particular, since home theaters are installed in a specific room in an ordinary home, there are spatial constraints. This makes it difficult to place a center speaker behind the projector screen, and even if it were to be placed there, it would have the same disadvantages as the problems that arise in movie theaters, etc., as mentioned above. In some situations, the center speaker itself may not be usable. Summary of the Invention [Problem to be solved by the invention]

[0006] In order to solve the above problems, the present invention aims to provide a sound screen for projectors that can provide improved sound effects by configuring the screen for projectors to function as speakers, especially as a center speaker and front speakers in multi-channel sound. Through this, the present invention aims to provide a sound screen for projectors that allows each viewer to receive the same quality sound regardless of their position by allowing the viewer (audience) positioned radially from the screen to hear the same sound pressure since the sound output from the screen is diffused radially forward (for example, 180° forward from the screen).

[0007] In addition, the present invention aims to provide a sound screen for projectors that can significantly improve image and sound quality by increasing the surface roughness of the screen to obtain a wide viewing angle and high brightness characteristics, and by applying a sound absorbing structure, etc., to reduce reverberation phenomena such as vibration and resonance within the enclosure caused by screen vibration, etc., and minimize image shaking and sound interference phenomena caused by excessive screen vibration. [Means for solving the problem]

[0008] In order to achieve the above-mentioned objectives, the sound screen for a projector according to the present invention includes a screen plate including a hard base layer made of a synthetic resin material and a reflective layer formed on the surface of the base layer to reflect an incident image; a back plate formed on the rear surface of the screen plate; and a vibration device formed on the rear surface of the back plate to vibrate the back plate.

[0009] The device may also include a profile formed on a rear surface of the backplate to support the backplate and protect the vibration device; and an amplifier that operates the vibration device based on an acoustic signal input from the outside.

[0010] In addition, the acoustic signal may be composed of at least two acoustic channels, and the vibration device may have at least two transducers configured to correspond to the acoustic channels, arranged in a left-right symmetrical structure with respect to a virtual vertical center line formed vertically at the center of the screen plate.

[0011] The speaker may further include a sound absorbing material that is disposed in at least one of the inner space formed by the profile and the rear surface of the back plate, and that reduces reverberation caused by vibration of the vibrator.

[0012] The back plate may further include a sound-absorbing, buffering finish panel that is configured on the rear surface of the back plate to further reduce the reverberation caused by the vibration of the vibrator and to reduce noise and vibration caused by friction and impact with the wall.

[0013] The reflective layer may also be modified to have a high surface roughness.

[0014] The reflective layer may be formed by applying paint containing a glittering material including aluminum powder and a pearl pigment to one side of the base layer.

[0015] In addition, the reflective layer may contain 4% to 8% by weight of a black colorant, and the aluminum powder may be coated with carbon black.

[0016] The aluminum powder may include at least two particle groups having different sizes.

[0017] The aluminum powder may include a first particle group having a particle size of 6 μm to 10 μm; and a second particle group having a particle size of 11 μm to 15 μm. Effect of the Invention

[0018] With the above-mentioned solution, the present invention has the advantage that an improved sound effect can be obtained by configuring the projector screen to function as a speaker, especially a center speaker and a front speaker in multi-channel sound. In addition, the present invention has the advantage that it is not necessary to configure a separate center speaker or front speaker, thereby improving space utilization. In addition, the present invention has the advantage that the sound output from the screen is diffused radially forward (for example, 180° forward from the screen), thereby providing the same improved quality sound to viewers (audiences) positioned radially from the screen. In addition, the present invention has the advantage that the surface roughness of the screen is increased by using aluminum particles, thereby obtaining a wide viewing angle and high brightness characteristics, and the sound absorbing structure is applied to reduce the reverberation phenomenon such as vibration and resonance in the enclosure caused by the screen vibration, thereby minimizing the image shaking and sound interference caused by excessive screen vibration, thereby greatly improving the image quality and sound quality. In addition, the present invention has an advantage in that it can provide a screen optimized for the usage environment by adjusting the screen's characteristics such as luminance (surface brightness), contrast, color and color temperature, and interference from natural and / or artificial light sources depending on the ratio of lustrous materials such as aluminum and pearl pigments and black colorants such as carbon black and / or the degree of coating with the lustrous materials. In this way, when the projector and screen do not match, it is possible to view an image optimized for the usage environment by replacing only the inexpensive screen without replacing the relatively expensive projector. [Brief description of the drawings]

[0019] [Figure 1] 1 is an exploded perspective view showing an embodiment of a sound screen for a projector according to the present invention; [Diagram 2] 2 is a diagram illustrating the configuration shown in FIG. 1 in more detail. [Diagram 3] 2 is a diagram illustrating the configuration shown in FIG. 1 in more detail. [Figure 4] FIG. 2 is a configuration diagram showing another embodiment of FIG. 1. [Diagram 5] 2 is a view showing an embodiment of a method for manufacturing the screen plate shown in FIG. 1; [Figure 6] 6 is a table showing the results of measuring the luminance of the screen manufactured by the method of FIG. 5. [Figure 7] 6 is a table showing the results of measuring the color and color temperature of the screen manufactured by the method of FIG. 5. [Figure 8] 6 is a table showing the results of measuring the surface roughness of the screen manufactured by the method of FIG. 5. [Figure 9] 9 is a graph showing the measurement results for each sample shown in FIG. 8. [Figure 10] 9 is a graph showing the measurement results for each sample shown in FIG. 8. [Figure 11] 9 is a graph showing the measurement results for each sample shown in FIG. 8. [Figure 12] 9 is a graph showing the measurement results for each sample shown in FIG. 8. [Figure 13] 9 is a graph showing the measurement results for each sample shown in FIG. 8. [Figure 14] 9 is a graph showing the measurement results for each sample shown in FIG. 8. [Figure 15] 9 is a graph showing the measurement results for each sample shown in FIG. 8. [Figure 16] 9 is a graph showing the measurement results for each sample shown in FIG. 8. [Figure 17] 9 is a graph showing the measurement results for each sample shown in FIG. 8. [Figure 18]9 is a graph showing the measurement results for each sample shown in FIG. 8. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The sound screen for a projector according to the present invention can be applied in various ways, and the most preferred embodiment will be described below with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing one embodiment of a sound screen for a projector according to the present invention, and FIGS. 2 and 3 are diagrams for explaining the configuration shown in FIG. 1 in more detail. Referring to FIG. 1, a sound screen A for a projector includes a screen plate 100, a back plate 200 and a vibration device 300.

[0021] The screen plate 100 projects an image output from a projector. In order to have a wide viewing angle and high brightness characteristics, the screen plate 100 may be made of a PET material with excellent smoothness and uniformity, and is modified to increase the surface roughness of the front surface, which will be described in more detail below. The screen plate 100 may be directly applied to the front surface of the back plate 200 or may be separately manufactured and attached to the front surface of the back plate 200 .

[0022] The back plate 200 is disposed on the rear surface of the screen plate 100, and enables the vibration generated by the vibration device 300 to be generated uniformly over the entire screen plate 100. The back plate 200 may be made of a hard material such as acrylic, PC, aluminum, glass, insulating material, gypsum, wood, etc. The vibration device 300 is provided with electrical energy to generate vibration energy, and is disposed on the rear surface of the backplate 200 to vibrate the backplate 200 .

[0023] The vibration device 300 may be composed of at least one vibrator depending on its performance and the size of the screen plate 100 . For example, the transducer may include at least one of 4 ohms 20W (rated output)_Exciter: 20hz~20khz, 8 ohms 20W (rated output)_Exciter: 20hz~20khz (Height: 28.5±0.5mm, Dia: 56±0.3mm), 8 ohms 15W (rated output)_Bass Shaker: 20hz~80hz (Height: 25mm, Dia: 70mm), and may be arranged in a symmetrical structure as shown in FIG. 4.

[0024] Additionally, the projector sound screen A may further include a profile 400 and an amplifier 500 . The profile 400 may be configured on the rear surface of the backplate 200 to support the backplate 200 and protect the vibration excitation device 300 .

[0025] The amplifier 500 operates the vibration device 300 based on an audio signal input from an external audio device (not shown), and can be connected to the audio device via short-range wireless communication such as Bluetooth or via a wire such as AUX, and can also be connected to the vibration device 300 via a wire or the like.

[0026] Meanwhile, an audio signal input from an external audio device may be composed of at least two audio channels, and may be classified into 2.1 channels, 5.1 channels, 7.1 channels, etc. depending on the number of channels.

[0027] Accordingly, the vibration device 300 may be composed of at least two vibrators corresponding to the number of the corresponding acoustic channels (e.g., center acoustics and front acoustics, etc.), and may be arranged in a left-right symmetrical structure based on a virtual vertical center line formed vertically at the center of the screen plate 100 as described above.

[0028] In addition, the sound screen A for a projector may further include a sound absorbing material 600 that fills the internal space formed by the profile 400 and reduces the reverberation caused by the vibration of the vibration device 300.

[0029] The sound absorbing material 600 may be divided into a number of pieces depending on the shape of the profile 400, and at least one of the sound absorbing materials 600 may have a through hole 601 formed at a position where the vibration device 300 is disposed. For example, the sound absorbing material 600 may be made of “polyester fiber” and may function to reduce sounds and noises reverberating from the rear surface of the screen plate 100 due to the vibration of the vibration device 300 .

[0030] In addition, the sound screen A for projectors may further include a sound-absorbing and buffering finishing panel 700 that is configured on the rear surface of the back plate 200 to further reduce the reverberation caused by the vibration of the vibration device 300 and to reduce noise and vibration caused by friction and impacts that occur when the sound screen A hits the wall of the room.

[0031] The finishing panel 700 is made of "Polyester fiber" material, similar to the sound absorbing material, and can have a sound absorption coefficient of 0.313 (NRC).

[0032] The sound screen A for projectors of the present invention described above can be applied not only to screens for general projection-type projectors (for example, a type that requires a certain distance (2 to 3 m) from the projector to the screen), but also to screens for UST (Ultra Short Throw) projectors.

[0033] However, in the case of the UST method, the surface of the screen plate 100 must have a UST type shape (e.g., a triangular waveform) rather than a general projection type, so it goes without saying that the technical features of the present invention are applied to the remaining parts of the screen plate 100 surface except for the external shape parts.

[0034] FIG. 4 is a block diagram showing another embodiment of the configuration of FIG. Referring to FIG. 4, as described above, the vibrators of the vibration device 300 have various sizes and characteristics depending on their performance and the characteristics of the acoustic channel to be matched, and multiple units may be configured depending on the size of the screen plate 100, etc. The vibrators may be arranged in various positions, but as shown in FIG. 4, they may be arranged in a symmetrical structure with respect to an imaginary vertical center line formed in the vertical direction at the center of the screen plate 100.

[0035] 4A, the profile 400 is formed in a two-stage structure, and the vibration device 300 may have two transducers arranged symmetrically on the upper part of the two-stage structure. For example, the upper two transducers may include a general-purpose "Exciter" 310. 4(b), the profile 400 is formed in a three-stage structure, and the vibration device 300 may have a total of six vibrators, two of which are arranged symmetrically on each stage. For example, the two vibrators in the center may include a bass shaker 320, and the four vibrators in the upper and lower parts may include a general-purpose exciter 310.

[0036] 4(c), the profile 400 is formed in a four-stage structure, and the vibration device 300 has a total of six vibrators, two of which are arranged symmetrically on the top three stages. For example, two bass shakers 320 and four general-purpose exciters 310 can be arranged on the top three stages in the manner shown in FIG. 4(b). Needless to say, they can be arranged in a variety of other configurations.

[0037] FIG. 5 is a diagram showing an embodiment of a method for manufacturing the screen plate shown in FIG. Referring to FIG. 5, the method for manufacturing the screen plate 100 includes a base layer preparing step (S100), a reflective layer forming step (S200), an adhesive layer forming step (S300), and a release paper attaching step (S400).

[0038] The base layer preparation step (S100) is a process of manufacturing a base layer 110 made of a synthetic resin material, and mainly, PET (Polyethylene terephthalate), PC (Polycarbonate), acrylic, PVC (Polyvinyl chloride), etc. can be used. In addition, when manufacturing the screen plate 100 using the corresponding materials, the film for graphics can be manufactured to have a thickness of 50 μm to 250 μm, and the film for screen solution can be manufactured to have a thickness of 175 μm to 250 μm, and can be manufactured in a variety of applications depending on the purpose of use and the needs of those skilled in the art.

[0039] The reflective layer forming step (S200) is a process of forming (painting, coating) the reflective layer 120 on one side (top side in FIG. 5) of the base layer 110 using (spraying) a reflective paint, and the main components of the reflective paint may include a lustrous material including aluminum powder and pearl pigment. For example, the reflective layer 120 may be composed of aluminum particles, beads, a light quenching agent, a colorant, an oil-based PVC resin, a thinner, etc. In addition, in the reflective layer forming step (S200), the paint can be applied by spraying in vertical and horizontal directions while controlling the spray pattern and amount set for the paint. For example, when the material of the base layer 110 is PET, the reflective layer forming step (S200) may coat the corresponding reflective paint to a thickness of 3 μm to 5 μm.

[0040] To look at this in more detail, when applying the reflective paint in the reflective layer formation step (S200), the reflective paint can be applied once at 1.4m / s~1.8m / s and once at 1.8m / s~2.2m / s in the vertical direction with a cycle speed of 110mm horizontal movement based on a spray amount of 70g~100g per minute.

[0041] The above-mentioned reflective coating material will be described in more detail below. The reflective coating for the screen plate 100 of the present invention may contain 8% to 12% by weight of aluminum powder in an oil-based synthetic resin, and in particular, the aluminum powder may contain at least two particle groups having different sizes. Here, the oil-based synthetic resin may contain PVC.

[0042] For example, the aluminum powder may include a first particle group having a particle size of 6 μm to 10 μm and a second particle group having a particle size of 11 μm to 15 μm. By mixing particles having two different sizes in this way, the smaller particles can fill the gaps between the larger particles and be uniformly distributed over the entire area.

[0043] In addition, the reflective coating material for the screen plate 100 may further contain 1% to 4% by weight of a quencher having a particle size of 3 μm to 5 μm. In addition, the reflective paint for the screen plate 100 may further contain 1% to 4% by weight of synthetic resin beads.

[0044] At this time, the beads are used to strengthen the surface scratches of the reflective layer (increase surface roughness) and to diffuse light, and as described above, the beads allow the reflective layer to simultaneously function as a diffusion layer without the need for a separate diffusion layer, thereby shortening the overall process and improving productivity. Here, the beads may be made of polypropylene.

[0045] In the present invention, the surface roughness of the reflective layer formed by the beads may have an arithmetical mean deviation of the profile (RA) value of 2 μm to 4 μm as shown in FIG. In addition, the reflective paint for the screen plate 100 may further contain 2% to 8% by weight of a colorant and 20% to 30% by weight of a thinner. Accordingly, the oil-based synthetic resin may be mixed in an amount of 42% by weight to 68% by weight based on the total weight of the reflective paint.

[0046] Through this process, once the reflective layer 120 is formed on one side of the base layer 110, an adhesive layer 130 is then laminated on the other side of the base layer 110 (S300), and a release paper 140 is laminated (attached) to the adhesive layer 130 (S400), thereby manufacturing a projector screen with improved viewing angle and brightness according to the present invention. Looking more specifically at the screen plate 100 manufactured in this manner, as shown in FIG. 5, a base layer 110 made of synthetic resin material and a reflective layer 120 modified to have high surface roughness by spraying paint containing aluminum powder onto one side of the base layer 110 (top in FIG. 5) can be formed. In this case, in order to further improve the surface brightness of the screen plate 100, the reflective layer 120 may contain 2% to 4% by weight of a black colorant. In other words, in the reflective layer forming step (S200) of the above-mentioned method for manufacturing the screen plate 100, the reflective paint for the screen plate 100 can be prepared by including 2% to 4% by weight of the black colorant.

[0047] The reflective layer 120 of the screen plate (100, type A) with the relatively improved surface brightness (luminance) was measured in a dark room using a Konica Minota CS-150 colorimeter, and the results were 190Lv~200Lv at the front viewing angle, 150Lv~160Lv at a 10° viewing angle based on the front, 110Lv~120Lv at a 20° viewing angle, 78Lv~88Lv at a 30° viewing angle, and 60Lv~70Lv at a 40° viewing angle, as shown in Fig. 6. At this time, the distance between the projector and the sample was 1900mm, and the distance and height between the measuring equipment and the sample were 2460mm and 1335mm, respectively.

[0048] For a general screen with similar characteristics, it is measured to be 192.58Lv at a viewing angle from the front, 115.66Lv at a viewing angle of 10° from the front, 84.12Lv at a viewing angle of 20°, 52.48Lv at a viewing angle of 30°, and 36.56Lv at a viewing angle of 40°. In comparison, the screen plate (100, type A) of the present invention has similar luminance characteristics at a front viewing angle, but has significantly improved luminance characteristics as it moves to the side.

[0049] If it is desired to further improve the contrast ratio of the screen plate 100, the reflective layer 120 may contain 4% to 8% by weight of black colorant, and carbon black may be coated on the aluminum powder. In other words, in the reflective layer forming step (S200) of the above-mentioned method for manufacturing the screen plate 100, a reflective paint for the screen plate 100 can be prepared by coating aluminum powder with carbon black and adding 4% to 8% by weight of black colorant.

[0050] The reflective layer 120 of the screen plate (100, type B) having a relatively improved brightness ratio was measured in a dark room using a Konica Minota CS-150 color luminance meter, and the results were 120Lv to 125Lv at a front viewing angle, 60Lv to 65Lv at a 10° viewing angle based on the front, 50Lv to 55Lv at a 20° viewing angle, 35Lv to 40Lv at a 30° viewing angle, and 25Lv to 30Lv at a 40° viewing angle, as shown in FIG. 6.

[0051] For a general screen with similar characteristics, it is measured as 58.33Lv at a viewing angle from the front, 48.04Lv at a viewing angle of 10° from the front, 37.94Lv at a viewing angle of 20°, 27.38Lv at a viewing angle of 30°, and 23.91Lv at a viewing angle of 40°. In comparison, it can be seen that the screen plate (100, type B) of the present invention has significantly improved luminance characteristics at all viewing angles. Also, the color and color temperature of each screen are shown in Figure 7, where Tcp stands for correlated color temperature, duv stands for Delta UV (color difference from black body locus), Pe stands for excitation purity, and λd stands for dominant wavelength.

[0052] The surface roughness of each screen plate 100 is shown in Fig. 8, and the measurement graphs of each sample are shown in Fig. 9 to Fig. 18. At this time, the surface roughness of the samples was measured using "SE 3500 (contact type measurement equipment)". As described above in detail with reference to FIG. 8, the surface roughness may be formed to have an arithmetic average roughness (RA) of 2 μm to 4 μm.

[0053] In contrast, a typical screen has an average surface roughness value of 0.93 μm, and in comparison, the surface roughness of the screen plate 100 of the present invention is higher. As a result, the reflective layer 120 of the screen plate 100 of the present invention can diffuse light more actively, and the brightness can also be increased. As a result, when the reflective layer 120 is formed according to the paint composition ratio described above, the present invention has the surface roughness characteristics shown in FIG. 8, and therefore the color and color temperature characteristics shown in FIG. 7 can be obtained, along with the luminance characteristics according to the viewing angle shown in FIG. 6.

[0054] Such luminance characteristics, color and color temperature characteristics according to the viewing angle can be said to be optimal conditions for achieving a wide viewing angle and high luminance characteristics, which is the object of the present invention. In addition, in the present invention, the base layer 110 is formed on the front surface of the backplate 200 , and the reflective layer 120 is formed on one side of the base layer 110 , so that the screen plate 100 can be formed on the front surface of the backplate 200 .

[0055] In addition, in the present invention, after manufacturing the screen plate 100 formed of the reflective layer 120, the base layer 110, the adhesive layer 130 and the release paper 140, the release paper 140 can be removed and attached to the front surface of the back plate 200.

[0056] The sound screen for a projector according to the present invention has been described above. It will be understood that the technical configuration of the present invention can be embodied in other specific forms by those skilled in the art to which the present invention pertains without changing the technical concept or essential features of the present invention. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive. [Explanation of symbols]

[0057] A: Sound screen for projectors 100: Screen plate 110: Base material layer 120: Reflective layer 130: Adhesive layer 140:Release paper 200: Back plate 300: Vibration device 400:Profile 500:Amplifier 600: Sound absorbing material 601: Through hole 610: EVA foam 700: Finishing panel [Industrial Applicability]

[0058] The present invention can be used in the field of projector screens, especially screens with speaker functions and front projection screens, as well as screens with wide viewing angles and high brightness characteristics, paints used to manufacture the screens, methods for applying the paints, and similar or related fields, thereby improving the reliability and competitiveness of products in the relevant fields.

Claims

1. A screen plate including a hard base layer made of a synthetic resin material and a reflective layer formed on the surface of the base layer to reflect an incident image; A back plate configured on a rear surface of the screen plate; and A sound screen for a projector, comprising: a vibration device arranged on a rear surface of the backplate to vibrate the backplate.

2. A profile formed on a rear surface of the backplate to support the backplate and protect the vibration device; and 2. The sound screen for a projector according to claim 1, further comprising: an amplifier for operating said vibration device based on an acoustic signal input from the outside.

3. The acoustic signal is Consists of at least two acoustic channels, The vibration device is 3. The sound screen for a projector as described in claim 2, characterized in that at least two transducers configured to correspond to the acoustic channels are arranged in a left-right symmetrical structure with respect to an imaginary vertical center line formed vertically in the center of the screen plate.

4. 3. The sound screen for a projector according to claim 2, further comprising a sound-absorbing material arranged in at least one of the internal space formed by the profile and the rear surface of the back plate, for reducing reverberation caused by vibration of a vibration excitation device.

5. 5. The sound screen for a projector according to claim 4, further comprising a sound-absorbing and buffering finishing panel arranged on the rear surface of the back plate to additionally reduce the reverberation caused by the vibration of the vibration device and to reduce noise and vibration generated by friction and impact with the wall.

6. The reflective layer is 2. The sound screen for a projector according to claim 1, which has been modified to have a high surface roughness.

7. The reflective layer is 7. The sound screen for a projector according to claim 6, wherein the base layer is formed by applying a paint containing a glittering material including aluminum powder and a pearl pigment to one side of the base layer.

8. The reflective layer is 4% to 8% by weight of a black colorant; 8. The sound screen for a projector according to claim 7, wherein the aluminum powder is coated with carbon black.

9. The aluminum powder is 8. The sound screen for a projector according to claim 7, comprising at least two particle groups having different sizes.

10. The aluminum powder is A first group of particles having a particle size of 6 μm to 10 μm; and 10. The projector sound screen according to claim 9, further comprising: a second particle group having a particle size of 11 μm to 15 μm.

Images