WO2019200979A1 - 透声幕及其制造方法 - Google Patents

透声幕及其制造方法 Download PDF

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Publication number
WO2019200979A1
WO2019200979A1 PCT/CN2019/070522 CN2019070522W WO2019200979A1 WO 2019200979 A1 WO2019200979 A1 WO 2019200979A1 CN 2019070522 W CN2019070522 W CN 2019070522W WO 2019200979 A1 WO2019200979 A1 WO 2019200979A1
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Prior art keywords
sound
hole
permeable
transmitting
screen
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English (en)
French (fr)
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张红秀
王杰
王霖
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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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
    • 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

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  • the invention relates to a sound-transmitting screen and a manufacturing method thereof, and belongs to the technical field of projection screen manufacturing.
  • the pursuit of the perfect fusion of sound and picture is the unremitting pursuit of the film industry for nearly a hundred years.
  • the ideal position of the speaker is behind the screen, so that the image and sound are perfectly integrated.
  • the sound screen is already the standard preparation of the theater, which can be maximized. Restore the true sound.
  • the sound-transmitting screen mainly has a perforating screen and a weaving screen, and the weaving screen has a low gain and a poor polarization maintaining performance.
  • the perforated screen has the advantages of high gain and high polarization.
  • a better sound transmission effect can be obtained at a lower perforation rate by reducing the size of the hole, the advantageous effect by reducing the size of the hole is limited, and the smaller the size of the hole, the manufacturing difficulty and The higher the cost.
  • the technical problem to be solved by the present invention is to provide a translucent screen and a manufacturing method thereof according to the deficiencies of the prior art.
  • By opening a blind hole on a conventional translucent screen the effective quality of the translucent screen is reduced, thereby In the case of affecting the reflectivity of the sound-transmitting screen, the sound-transparent effect of the sound-transmitting screen is improved.
  • the invention provides a translucent screen comprising a translucent curtain substrate, wherein the translucent curtain substrate is provided with a plurality of sound-permeable holes and a plurality of blind holes.
  • the sound-permeable holes are regularly arranged or randomly arranged; the blind holes are regularly arranged or randomly arranged.
  • the regular arrangement includes a matrix arrangement, an equilateral triangle arrangement, or a ring arrangement.
  • the sound-permeable hole and the blind hole are arranged in a matrix, and the sound-permeable hole and the blind hole are arranged at intervals.
  • the through hole ratio of the sound transmission hole is 0.5% to 5%; and the hole radius of the sound transmission hole is 0.05 mm to 0.75 mm.
  • the blind hole has a blind hole ratio of 0.1% to 50%; and the blind hole has a radius of 1-10 times the hole radius of the sound-permeable hole.
  • the depth of the blind hole is 1/5-4/5 of the thickness of the sound-permeable curtain substrate.
  • the invention provides a method for manufacturing a sound-transmitting screen according to any one of the above aspects, which is characterized in that a sound-permeable hole and a blind hole are formed on the sound-transmitting screen substrate.
  • the blind holes are regularly arranged or randomly arranged on the sound-permeable curtain substrate.
  • the blind hole has a blind hole ratio of 0.1% to 50%; and the blind hole has a radius of 1 to 10 times the radius of the sound hole.
  • the present invention reduces the effective quality of the sound-transmitting screen by opening a blind hole on the conventional sound-transmitting screen, thereby improving the sound-permeable effect of the sound-transmitting screen without affecting the reflectivity of the sound-transmitting screen.
  • Figure 1 is a schematic diagram showing changes in attenuation value and effective mass per unit area of a sound-transmitting screen
  • Embodiment 1 of a sound transmitting screen according to the present invention is a schematic structural view of Embodiment 1 of a sound transmitting screen according to the present invention
  • FIG. 3 is a schematic structural view of a second embodiment of a sound transmitting screen according to the present invention.
  • FIG. 4 is a schematic structural view of a third embodiment of the sound-transmitting screen of the present invention.
  • the invention provides a sound transmissive screen comprising a sound transmissive screen substrate, wherein the translucent screen substrate is provided with a plurality of sound transmissive holes and blind holes.
  • the material of the sound-permeable curtain substrate is polyvinyl chloride (PVC), polycarbonate (PC) or polyethylene terephthalate (PET).
  • the sound-permeable hole is a through hole formed in the sound-transmitting screen substrate, that is, the depth of the sound-permeable hole is the same as the thickness of the sound-transmitting screen substrate, and the sound emitted from the side of the sound-transmitting screen passes through the sound-permeable hole After that, it can reach the other side of the sound-transmitting screen.
  • the depth of the blind hole is less than the thickness of the sound permeable curtain substrate.
  • the shape of the opening of the sound-permeable hole and the blind hole in the present invention includes, but is not limited to, a circle, a triangle, a square, a polygon, and the like.
  • the sound transmission hole and the blind hole are both circular.
  • the invention does not limit the arrangement of the sound permeable aperture and the blind aperture.
  • the sound-permeable holes may be regularly arranged or randomly arranged.
  • the sound-permeable holes may be arranged in a matrix, that is, the adjacent sound-permeable holes form a rectangle; or the sound-transmitting holes are arranged in an equilateral triangle, that is, the sound-permeable holes are arranged in a row, and the sound-permeable holes of each row are evenly arranged.
  • the adjacent three sound-permeable holes of the adjacent two rows form an equilateral triangle; or the sound-permeable holes are arranged in a ring shape, that is, the plurality of sound-permeable holes constitute a plurality of rings; or the sound-permeable holes are random Distributed on the sound-permeable curtain substrate.
  • the blind holes may also be arranged regularly or randomly.
  • the sound-permeable hole and the blind hole are arranged in the same regularity, and the sound-permeable hole and the blind hole are arranged at intervals.
  • Table 1 shows the variation of the acoustic wave attenuation value of 20,000 Hz (the intensity of the sound that is not transmitted through the translucent curtain minus the intensity of the sound transmitted through the translucent curtain) as a function of the aperture ratio a.
  • a different number of sound-transparent holes are formed in a 0.3 mm-thick sound-transmissive screen made of PVC material, and the sound-permeable hole has a hole radius of 0.25 mm, which can be opened from Table 1, with the through-hole As the rate a increases, the attenuation value becomes smaller and smaller.
  • the through-hole ratio a in the present invention is preferably 0.5% to 5%.
  • the attenuation value is also related to the hole radius r of the sound transmission hole, and Table 2 shows the variation of the sound wave attenuation value of 20,000 Hz with the hole radius r of the sound transmission hole.
  • Table 2 shows the variation of the sound wave attenuation value of 20,000 Hz with the hole radius r of the sound transmission hole.
  • the hole radius r of the sound-permeable hole is preferably 0.05 mm to 0.75 mm.
  • the present invention also provides another method for reducing the attenuation value without reducing the image quality, that is, a sound transmission screen having a sound transmission hole A blind hole is formed on the substrate.
  • the effective mass m per unit area of the sound-transmitting screen can be effectively reduced, and the smaller the effective mass m per unit area of the sound-transmitting screen, the smaller the sound attenuation.
  • the sound transmission coefficient of the sound-transmitting screen is T
  • Z 0 is the impedance of air
  • ⁇ 0 and c 0 are the air density and the speed of the sound in the air, respectively
  • Z m is the sound through the sound screen Impedance
  • Z m j ⁇ m
  • ⁇ is the acoustic angular frequency
  • m is the effective mass per unit area of the sound-transmitting screen.
  • m 1 the effective mass of air in the sound-transparent hole
  • m 1 ⁇ 0 (t+1.6r 0 )/a
  • t the thickness of the sound-transmitting curtain
  • r 0 the hole radius of the sound-permeable hole
  • a the through-hole rate
  • m 2 is the effective mass per unit area of the unperforated portion of the sound-transmitting screen
  • m 2 ⁇ (1-a)
  • ⁇ the density of the unperforated portion of the sound-transmitting screen.
  • Figure 1 is a schematic diagram showing the variation of the attenuation value and the effective mass per unit area of the sound-transmitting screen.
  • Figure 1 shows the attenuation of the PET translucent screen (without blind holes) and the effective mass per unit area of the translucent screen with a through-hole ratio of 5% and a hole radius of 0.25 mm.
  • the ordinate is the translucent screen.
  • the sound intensity is subtracted from the initial sound intensity, and the abscissa is the effective mass per unit area of the sound-transmitting screen.
  • the effective mass m per unit area of the sound-transmitting screen is greater, and the sound through the sound-transmitting screen The greater the difference between the intensity and the initial sound intensity, the greater the attenuation value of the sound-transmitting screen.
  • the effective mass per unit area of the sound-transmitting screen decreases as the blind hole rate and the blind hole depth increase.
  • the effective mass per unit area of the sound-transmitting curtain is reduced, and it is positively correlated with the blind hole ratio a 2 and the depth t 2 .
  • the depth of the blind hole is 1/5-4/5 of the thickness of the sound-transmitting curtain substrate, and the blind hole ratio a 2 is 0.1%. -50%. More preferably, the radius of the blind hole is 1-10 times the radius of the hole of the sound-transmitting hole in consideration of processing cost and processing difficulty.
  • Embodiment 1 of the sound transmitting screen of the present invention is a schematic structural view of Embodiment 1 of the sound transmitting screen of the present invention.
  • a PVC coil having a thickness of 0.3 mm is used as the sound-transmitting curtain substrate 110, and the sound-permeable holes 120 are disposed on the sound-permeable curtain substrate 110 in a square matrix manner.
  • the sound hole 120 has a radius r 0 of 0.25 mm and a square side length of 2 mm; the blind hole 130 is located in the middle of each two adjacent sound-permeable holes 120, and the blind hole 130 has a depth of 0.2 mm.
  • the radius is 0.25 mm, so that the blind hole 130 and the sound-permeable hole 120 together form a square matrix having a side length of 1 mm.
  • the sound-permeable curtain substrate 110 is placed on a perforation production line, such as a roll-to-roll laser drilling device or a mechanical punching device, such as a continuous punching production line. Adjusting the parameters of the punching machine according to the type, thickness and hole size of the sound-transmitting screen substrate, and setting the number and size of the sound-permeable holes 120 and the blind holes 130 on the screen per unit area by using a computer connected to the punching machine, thereby determining the unit area permeation. The total perforated area of the sound hole 120 and the blind hole 130 on the sound curtain, that is, the through hole rate and the blind hole rate.
  • the laser light source is a CO 2 light source, and the power is 30w-200w.
  • the power of the laser light source is set to 150w, and when the blind hole 130 is punched, the power of the laser light source is reduced to 80w.
  • the test results are shown in Tables 3 and 4.
  • the test objects in Table 3 are only The sound-transmitting screen of the sound-permeable hole 120 is opened, and the test object in Table 4 is a sound-transmitting screen with a blind hole 130 and a sound-permeable hole 120.
  • FIG. 3 is a schematic structural view of a second embodiment of the sound-transmitting screen of the present invention.
  • a PVC coil having a thickness of 0.3 mm is used as the sound-transmitting curtain substrate 210, and the sound-permeable holes 220 and the blind holes 230 are randomly arranged on the sound-permeable curtain substrate 210. on.
  • the sound hole 220 has a radius r 0 of 0.25 mm
  • the blind hole 230 has a depth of 0.2 mm and a radius of 0.25 mm.
  • the laser light source is a CO 2 light source, and the power is 30w-200w.
  • the power of the laser light source is set to 150w, and when the blind hole 230 is punched, the power of the laser light source is reduced to 80w.
  • the sound transmission hole 220 and the blind hole 230 are randomly arranged. Specifically, in order to ensure that the through-hole ratio of the sound-transmitting screen in the embodiment is 5%, 254777 sound-permeable holes 220 need to be opened on the per-square-meter translucent curtain substrate 210 to ensure the blind hole rate of the blind hole 230. At 15%, 764,331 blind holes 230 need to be opened per square meter of the translucent curtain substrate 210. It should be noted that even if some of the blind holes 230 overlap with the position of the sound-transmitting holes 220, the image quality and the sound-permeable effect are not affected.
  • FIG. 4 is a schematic structural view of a third embodiment of the sound-transmitting screen of the present invention.
  • the radius r 0 of the sound-transmitting hole 320 is changed from 0.25 mm to 0.1 mm.
  • the sound-transmitting screen substrate 310 of the sound-transmitting screen is blind.
  • the structure of the hole 330 is the same as that of the first embodiment, and details are not described herein again.
  • the radius of the sound-permeable hole 320 is reduced to 0.1 mm, which improves the viewing experience of the user.
  • the present invention reduces the effective quality of the sound-transmitting screen by opening a blind hole on the conventional sound-transmitting screen, thereby improving the sound-permeable effect of the sound-transmitting screen without affecting the reflectivity of the sound-transmitting screen.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Curtains And Furnishings For Windows Or Doors (AREA)

Abstract

一种透声幕及其制造方法，透声幕包括透声幕基材（110），透声幕基材（110）上设有多个透声孔（120）和多个盲孔（130）。通过在传统的透声幕上开设盲孔（130），降低了透声幕的有效质量，从而在不影响透声幕反射率的情况下，提高了透声幕透声效果。

Description

透声幕及其制造方法 技术领域
本发明涉及一种透声幕及其制造方法，属于放映屏幕制造技术领域。
背景技术
追求声音和画面的完美融合是电影业近百年来不懈的追求，音箱最理想的摆放位置是在屏幕之后，让图像和声音完美融合，现在透声幕已经是影院的标准配制，可以最大限度地还原真实的声音。目前的透声幕主要有打孔幕和编织幕，编织幕透声幕增益低、保偏性能差。打孔幕具有高增益、高保偏性等优点。
对于固定孔的尺寸，单位面积孔的数量越多，透声效果越好，衰减值越小，而这是以牺牲屏幕反射率即画质效果为代价的。虽然通过减小孔的尺寸，可以在较低的穿孔率情况下就得到更好的透声效果，但是，通过减小孔的尺寸产生的有益效果有限，而且孔的尺寸越小，制造难度和成本越高。
发明内容
本发明所要解决的技术问题在于针对现有技术的不足，提供一种透声幕及其制造方法，通过在传统的透声幕上开设盲孔，降低了透声幕的有效质量，从而在不影响透声幕反射率的情况下，提高了透声幕透声效果。
本发明所要解决的技术问题是通过如下技术方案实现的：
本发明提供一种透声幕，包括透声幕基材，所述透声幕基材上设有多个透声孔和多个盲孔。
优选地，所述透声孔规则排列或随机排列；所述盲孔规则排列或随机排列。
具体地，所述规则排列包括矩阵排列、等边三角形排列或环形排列。
优选地，所述透声孔和所述盲孔均矩阵排列，且所述透声孔和所述盲孔相互间隔排列。
为了提高透声幕的透声效果及画质效果，所述透声孔的通孔率为0.5％-5％；所述透声孔的孔半径为0.05mm-0.75mm。
为了降低透声幕的衰减，所述盲孔的盲孔率为0.1％—50％；所述盲孔的半径为所述透声孔的孔半径的1-10倍。所述盲孔的深度为透声幕基材厚度的1/5-4/5。
本发明提供一种以上任一技术方案所述的透声幕的制造方法，制造方法为在透声幕基材上开设透声孔和盲孔。
优选地，所述盲孔在透声幕基材上规则排列或随机排列。
优选地，所述盲孔的盲孔率为0.1％—50％；所述盲孔的半径为透声孔的孔半径的1-10倍。
综上所述，本发明通过在传统的透声幕上开设盲孔，降低了透声幕的有效质量，从而在不影响透声幕反射率的情况下，提高了透声幕透声效果。
下面结合附图和具体实施例，对本发明的技术方案进行详细地说明。
附图说明
图1为衰减值与透声幕单位面积有效质量的变化示意图；
图2为本发明透声幕实施例一的结构示意图；
图3为本发明透声幕实施例二的结构示意图；
图4为本发明透声幕实施例三的结构示意图。
具体实施方式
本发明提供一种透声幕，所述透声幕包括透声幕基材，所述透声幕基材上设有多个透声孔和盲孔。
所述透声幕基材的材质为聚氯乙烯(PVC)、聚碳酸酯(PC)或聚 对苯二甲酸乙二醇酯(PET)。
所述透声孔为开设在透声幕基材上的通孔，即所述透声孔的深度与透声幕基材的厚度相同，从透声幕一侧发出的声音穿过透声孔后能够到达透声幕的另一侧。所述盲孔的深度小于透声幕基材的厚度。本发明中所述透声孔和盲孔的开口形状包括但不限于圆形、三角形、正方形、多边形等。优选地，所述透声孔和盲孔均为圆形。
本发明并不限制所述透声孔和所述盲孔的排列方式。
所述透声孔可以规则排列或者随机排列。例如，所述透声孔可以矩阵排列，即相邻的透声孔形成矩形；或者，所述透声孔等边三角形排列，即所述透声孔成行排列，每行的透声孔均匀排列，且相邻两行中相邻的三个透声孔形成等边三角形；或者，所述透声孔环形排列，即多个透声孔组成多个圆环；或者，所述透声孔随机的分布在透声幕基材上。
所述盲孔也可以规则排列或者随机排列。
优选地，所述透声孔和所述盲孔以相同的规则排列，且所述透声孔和所述盲孔相互间隔排列。
一般来说，透声孔的通孔率a越大，透声效果越好，所述通孔率为所有透声孔的面积与透声幕总面积的比值。表1示出了20000Hz的声波衰减值(未透过透声幕的声音强度减去透过透声幕后的声音强度)随通孔率a的变化。具体来说，在0.3mm厚的由PVC材质制作的透声幕上开设不同数量的透声孔，所述透声孔的孔半径为0.25mm，从表1中可以开出，随着通孔率a的增加，衰减值越来越小。
表1
通孔率a 3％ 4％ 5％ 6％ 7％
衰减值D/dB 12.31 10.13 8.49 7.21 6.19
然而由于通孔率过大时，透声幕的反射率降低，使得画质效果效果较差，因此，本发明中通孔率a优选为0.5％-5％。
需要补充的是，在通孔率确定的情况下，衰减值还和透声孔的孔半径r有关，表2示出了20000Hz的声波衰减值随透声孔的孔半径r的变化。具体来说，在0.3mm厚的由PVC材质制作的透声幕上开设不 同半径的透声孔，使透声幕的通孔率a为5％，从表2中可以看出，随着孔半径r的增加，衰减值越来越大。
表2
孔半径r/mm 0.1 0.2 0.3 0.4 0.5
衰减值D/dB 5.67 7.64 9.27 10.66 11.85
然而随着孔半径的减小，其工艺难度增大，成本增高，为了保证其性价比，所述透声孔的孔半径r优选为0.05mm-0.75mm。
除控制透声孔的孔半径r和通孔率a之外，本发明还提供另一种在不降低画质的情况下，减少衰减值的方法，即在开设有透声孔的透声幕基材上开设盲孔。
通过增设盲孔，可以有效的减小透声幕单位面积的有效质量m，而透声幕单位面积的有效质量m越小，声音的衰减越小。
具体来说，透声幕的透声系数为T，则
Figure PCTCN2019070522-appb-000001
其中，Z 0为空气的阻抗，Z 0＝ρ 0c 0＝415kg/m 2·s，ρ 0和c 0分别为空气密度和声音在空气中的速度；Z m为透声幕对声音的阻抗，Z m＝jωm，ω为声波角频率，m为透声幕单位面积的有效质量。
Figure PCTCN2019070522-appb-000002
其中，m 1为透声孔中空气的有效质量，m 1＝ρ 0(t+1.6r 0)/a，t为透声幕厚度，r 0为透声孔的孔半径，a为通孔率。m 2为透声幕未穿孔部分单位面积的有效质量，m 2＝ρ(1-a)，ρ为透声幕未穿孔部分的密度。将具体参数带入m的计算公式后得到：
Figure PCTCN2019070522-appb-000003
再结合公式D＝20log|T|可得到衰减值D与透声幕单位面积有效质量m的变化关系。图1为衰减值与透声幕单位面积有效质量的变化示意图。图1中示出了通孔率为5％、孔半径为0.25mm的PET透声幕(无盲孔)衰减值与透声幕单位面积有效质量的变化，其纵坐标为透过透 声幕的声音强度减去初始声音强度的数值，横坐标为透声幕单位面积的有效质量，从图1中可以看出，透声幕单位面积的有效质量m越大，透过透声幕的声音强度与初始声音强度的差值越大，即透声幕的衰减值越大。
在上述透声幕上开设盲孔率(所有盲孔的面积与透声幕总面积的比值)为a 2、深度为t 2盲孔后，忽略盲孔中空气的有效质量，即m 1不变，m 2＝ρ(1-a)-ρa 2t 2/t，则
Figure PCTCN2019070522-appb-000004
从上式可以看出，透声幕单位面积的有效质量随盲孔率和盲孔深度的增加而减小。换句话说，在透声幕基材上开设盲孔后，透声幕的单位面积的有效质量减小，且其与盲孔率a 2和深度t 2正相关。
优选地，为了得到更好透声效果的同时，保证其画面效果，所述盲孔的深度为透声幕基材厚度的1/5-4/5，所述盲孔率a 2为0.1％—50％。更优选地，考虑到加工成本及加工难度，所述盲孔的半径为透声孔的孔半径的1-10倍。
以下将结合附图对本发明各实施例的技术方案进行清楚、完整的描述，显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所得到的所有其他实施例，都属于本发明所保护的范围。
实施例一
图2为本发明透声幕实施例一的结构示意图。如图1所示，在本实施例中，采用厚度为0.3mm的PVC卷材作为透声幕基材110，所述透声孔120以正方形矩阵的方式设置在透声幕基材110上，所述透声孔120的半径r 0为0.25mm，所述正方形边长为2mm；所述盲孔130位于每两个相邻透声孔120的中间，所述盲孔130的深度为0.2mm，半径为0.25mm，从而使得盲孔130和透声孔120共同组成边长为1mm的正方形矩阵。
具体地，在生产透声幕时，将透声幕基材110放在穿孔生产线上，如卷对卷(roll to roll)激光打孔设备或者机械冲孔设备等连续化打孔生产线，其可根据透声幕基材的种类、厚度、孔大小调整打孔机参数，利用和打孔机连接的电脑设置单位面积屏幕上透声孔120和盲孔130的数量和尺寸，从而确定单位面积透声幕上透声孔120和盲孔130的总穿孔面积，即通孔率和盲孔率。
在本实施例中，采用激光打孔，激光光源为CO 2光源，功率为30w-200w。当打透声孔120时，将激光光源的功率设定为150w，当打盲孔130时，将激光光源的功率减小至80w。
由于人耳可以听见的声波频率范围为20Hz-20000Hz，对通过上述方法生产的透声幕在不同声波频率下的衰减进行试验，试验结果见表3和表4，表3中的试验对象为仅开设透声孔120的透声幕，表4中的试验对象为开设有盲孔130和透声孔120的透声幕。
表3
频率/Hz 500 2000 5000 8000 12500 20000
衰减/dB 0.03 0.56 2.80 4.35 6.77 9.89
表4
频率/Hz 500 2000 5000 8000 12500 20000
衰减/dB 0.02 0.24 1.33 2.81 5.06 7.11
从表3和表4中可以看出，在不同的声波频率下，增设盲孔130后，透声幕的衰减值均有所降低。
实施例二
图3为本发明透声幕实施例二的结构示意图。如图3所示，在本实施例中，采用厚度为0.3mm的PVC卷材作为透声幕基材210，所述透声孔220和盲孔230随机排列在所述透声幕基材210上。所述透声孔220的半径r 0为0.25mm，所述盲孔230的深度为0.2mm，半径为0.25mm。
本实施例采用激光打孔，激光光源为CO 2光源，功率为30w-200w。 当打透声孔220时，将激光光源的功率设定为150w，当打盲孔230时，将激光光源的功率减小至80w。
与实施例一不同的是，本实施例中透声孔220和盲孔230随机排列。具体来说，为保证本实施例中透声幕的通孔率为5％，需要在每平方米透声幕基材210上开设254777个透声孔220，为保证盲孔230的盲孔率为15％，需要在每平方米透声幕基材210上开设764331个盲孔230。需要说明的是，即使有部分盲孔230与透声孔220位置有交叠也不影响画质和透声效果。
实施例三
图4为本发明透声幕实施例三的结构示意图。如图4所示，本实施例与实施例一相比，所述透声孔320的半径r 0由0.25mm变为0.1mm，本实施例中透声幕的透声幕基材310及盲孔330的结构与实施例一相同，在此不再赘述。
当用户的观影距离小于3m-4m时，若透声孔320的半径过大，用户在观影时有可能看到透声幕上的透声孔320，观影体验差，本实施例将透声孔320的半径缩小为0.1mm，提高了用户的观影体验。
综上所述，本发明通过在传统的透声幕上开设盲孔，降低了透声幕的有效质量，从而在不影响透声幕反射率的情况下，提高了透声幕透声效果。

Claims (10)

  1. 一种透声幕，包括透声幕基材，其特征在于，所述透声幕基材上设有多个透声孔和多个盲孔。
  2. 如权利要求1所述的透声幕，其特征在于，所述透声孔规则排列或随机排列；所述盲孔规则排列或随机排列。
  3. 如权利要求2所述的透声幕，其特征在于，所述规则排列包括矩阵排列、等边三角形排列或环形排列。
  4. 如权利要求3所述的透声幕，其特征在于，所述透声孔和所述盲孔均矩阵排列，且所述透声孔和所述盲孔相互间隔排列。
  5. 如权利要求1所述的透声幕，其特征在于，所述透声孔的通孔率为0.5％-5％；所述透声孔的孔半径为0.05mm-0.75mm。
  6. 如权利要求5所述的透声幕，其特征在于，所述盲孔的盲孔率为0.1％—50％；所述盲孔的半径为所述透声孔的孔半径的1-10倍。
  7. 如权利要求1所述的透声幕，其特征在于，所述盲孔的深度为透声幕基材厚度的1/5-4/5。
  8. 一种如权利要求1至7中任一项所述的透声幕的制造方法，其特征在于，所述制造方法为在透声幕基材上开设透声孔和盲孔。
  9. 如权利要求8所述的制造方法，其特征在于，所述盲孔在透声幕基材上规则排列或随机排列。
  10. 如权利要求9所述的制造方法，其特征在于，所述盲孔的盲孔率为0.1％—50％；所述盲孔的半径为所述透声孔的孔半径的1-10倍。
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