CN110389496A - Entrant sound curtain and its manufacturing method - Google Patents
Entrant sound curtain and its manufacturing method Download PDFInfo
- Publication number
- CN110389496A CN110389496A CN201810358980.0A CN201810358980A CN110389496A CN 110389496 A CN110389496 A CN 110389496A CN 201810358980 A CN201810358980 A CN 201810358980A CN 110389496 A CN110389496 A CN 110389496A
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- Prior art keywords
- curtain
- sound
- entrant sound
- hole
- entrant
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 230000000149 penetrating effect Effects 0.000 claims abstract description 65
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 239000011148 porous material Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 8
- 239000011159 matrix material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 13
- 238000002310 reflectometry Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 239000004800 polyvinyl chloride Substances 0.000 description 5
- 238000010009 beating Methods 0.000 description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 238000009954 braiding Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Curtains And Furnishings For Windows Or Doors (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
A kind of entrant sound curtain and its manufacturing method, the entrant sound curtain include entrant sound curtain substrate, and the entrant sound curtain substrate is equipped with multiple sound penetrating holes and multiple blind holes.The present invention reduces the effective mass of entrant sound curtain, to improve entrant sound curtain entrant sound effect in the case where not influencing entrant sound curtain reflectivity by opening up blind hole on traditional entrant sound curtain.
Description
Technical field
The present invention relates to a kind of entrant sound curtain and its manufacturing methods, belong to projection screen manufacturing technology field.
Background technique
Pursuing being perfectly combined for sound and picture is moviemaking unremitting pursuit in the last hundred years, and speaker is optimal to put position
Setting is to allow image and sound to be perfectly combined after screen, and present entrant sound curtain has been the standard preparation of movie theatre, can be with maximum limit
Degree ground restores true sound.Current entrant sound curtain mainly has punching curtain and braiding curtain, and the curtain gain of curtain entrant sound is low for braiding, polarization-maintaining
It can be poor.Punching curtain has many advantages, such as high-gain, high polarization-maintaining.
For the size of fixation hole, the quantity of perforations per unit area is more, and entrant sound effect is better, and pad value is smaller, and this is
To sacrifice screen reflection rate i.e. image quality effect as cost.Although, can be in lower punching rate feelings by the size for reducing hole
Better entrant sound effect is just obtained under condition, still, the beneficial effect that the size by reducing hole generates is limited, and the size in hole
Smaller, manufacture difficulty and cost are higher.
Summary of the invention
Technical problem to be solved by the present invention lies in view of the deficiencies of the prior art, provide a kind of entrant sound curtain and its manufacture
Method reduces the effective mass of entrant sound curtain, thus anti-not influencing entrant sound curtain by opening up blind hole on traditional entrant sound curtain
In the case where penetrating rate, entrant sound curtain entrant sound effect is improved.
The technical problem to be solved by the present invention is to what is be achieved through the following technical solutions:
The present invention provides a kind of entrant sound curtain, including entrant sound curtain substrate, the entrant sound curtain substrate be equipped with multiple sound penetrating holes and
Multiple blind holes.
Preferably, the sound penetrating hole is regularly arranged or random alignment；The blind hole is regularly arranged or random alignment.
Specifically, described regularly arranged including matrix arrangement, triangular arranged or annular array.
Preferably, the sound penetrating hole and the equal matrix arrangement of the blind hole, and the sound penetrating hole and the blind hole are spaced apart from each other
Arrangement.
In order to improve the entrant sound effect and image quality effect of entrant sound curtain, the through-hole rate of the sound penetrating hole is 0.5%-5%；It is described
The pore radius of sound penetrating hole is 0.05mm-0.75mm.
In order to reduce the decaying of entrant sound curtain, the blind hole rate of the blind hole is 0.1% -50%；The radius of the blind hole is institute
1-10 times for stating the pore radius of sound penetrating hole.The depth of the blind hole is the 1/5-4/5 of entrant sound curtain base material thickness.
The present invention provides the manufacturing method of entrant sound curtain described in more than one any technical solutions, and manufacturing method is in entrant sound
Sound penetrating hole and blind hole are opened up on curtain substrate.
Preferably, the blind hole regularly arranged or random alignment on entrant sound curtain substrate.
Preferably, the blind hole rate of the blind hole is 0.1% -50%；The radius of the blind hole is the pore radius of sound penetrating hole
1-10 times.
In conclusion the present invention by opening up blind hole on traditional entrant sound curtain, reduces the effective mass of entrant sound curtain, from
And in the case where not influencing entrant sound curtain reflectivity, improve entrant sound curtain entrant sound effect.
In the following with reference to the drawings and specific embodiments, technical solution of the present invention is described in detail.
Detailed description of the invention
Fig. 1 is the variation schematic diagram of pad value and entrant sound curtain unit area effective mass；
Fig. 2 is the structural schematic diagram of entrant sound curtain embodiment one of the present invention；
Fig. 3 is the structural schematic diagram of entrant sound curtain embodiment two of the present invention；
Fig. 4 is the structural schematic diagram of entrant sound curtain embodiment three of the present invention.
Specific embodiment
The present invention provides a kind of entrant sound curtain, and the entrant sound curtain includes entrant sound curtain substrate, and the entrant sound curtain substrate is equipped with more
A sound penetrating hole and blind hole.
The material of the entrant sound curtain substrate is polyvinyl chloride (PVC), polycarbonate (PC) or polyethylene terephthalate
Ester (PET).
The sound penetrating hole is the through-hole being provided on entrant sound curtain substrate, i.e., depth and the entrant sound curtain substrate of the described sound penetrating hole
Thickness is identical, and the sound issued from entrant sound curtain side can reach the other side of entrant sound curtain after sound penetrating hole.The blind hole
Depth is less than the thickness of entrant sound curtain substrate.Heretofore described sound penetrating hole and the opening shape of blind hole include but is not limited to it is round,
Triangle, square, polygon etc..Preferably, the sound penetrating hole and blind hole are circle.
The present invention is not intended to limit the arrangement mode of the sound penetrating hole and the blind hole.
The sound penetrating hole can regularly arranged or random alignment.For example, the sound penetrating hole can be that is, adjacent with matrix arrangement
Sound penetrating hole formed rectangle；Alternatively, the sound penetrating hole triangular arranged, i.e., the described sound penetrating hole arrangement in a row, every row it is saturating
Acoustic aperture is evenly distributed, and three sound penetrating holes adjacent in adjacent rows form equilateral triangle；Alternatively, the sound penetrating hole ring row
Column, i.e., multiple sound penetrating holes form multiple annulus；Alternatively, the sound penetrating hole is randomly distributed on entrant sound curtain substrate.
The blind hole can also regularly arranged or random alignment.
Preferably, the sound penetrating hole and the blind hole are with identical regularly arranged, and the sound penetrating hole and the blind hole phase
Mutually it is alternatively arranged.
In general, the through-hole rate a of sound penetrating hole is bigger, and entrant sound effect is better, and the through-hole rate is the face of all sound penetrating holes
The long-pending ratio with the entrant sound curtain gross area.The acoustic attenuation value that table 1 shows 20000Hz (does not subtract through the intensity of sound of entrant sound curtain
Go the intensity of sound through entrant sound backstage) with the variation of through-hole rate a.Specifically, 0.3mm it is thick by PVC material production
The sound penetrating hole of different number is opened up on entrant sound curtain, the pore radius of the sound penetrating hole is 0.25mm, it can be outputed from table 1, with
The increase of through-hole rate a, pad value are smaller and smaller.
Table 1
| Through-hole rate a | 3% | 4% | 5% | 6% | 7% |
| Pad value D/dB | 12.31 | 10.13 | 8.49 | 7.21 | 6.19 |
However when excessive due to through-hole rate, the reflectivity of entrant sound curtain is reduced, so that image quality effects are poor, therefore, this
Through-hole rate a is preferably 0.5%-5% in invention.
You need to add is that pad value is also related with the pore radius r of sound penetrating hole, and table 2 shows in the case where through-hole rate determines
The acoustic attenuation value of 20000Hz is gone out with the variation of the pore radius r of sound penetrating hole.Specifically, in 0.3mm thickness by PVC material
The sound penetrating hole that different radii is opened up on the entrant sound curtain of production makes the through-hole rate a 5% of entrant sound curtain, from Table 2, it can be seen that with
The increase of pore radius r, pad value it is increasing.
Table 2
| Pore radius r/mm | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 |
| Pad value D/dB | 5.67 | 7.64 | 9.27 | 10.66 | 11.85 |
However as the reduction of pore radius, technology difficulty increases, and cost increases, described in order to guarantee its cost performance
The pore radius r of acoustic aperture is preferably 0.05mm-0.75mm.
In addition to the pore radius r and through-hole rate a of control sound penetrating hole, the present invention also provides another kinds in the feelings for not reducing image quality
Under condition, the method for reducing pad value opens up blind hole on the entrant sound curtain substrate for offering sound penetrating hole.
By adding blind hole, it can effectively reduce the effective mass m of entrant sound curtain unit area, and entrant sound curtain unit area
Effective mass m it is smaller, the decaying of sound is smaller.
Specifically, the acoustical transimittivity of entrant sound curtain is T, then
Wherein, Z0For the impedance of air, Z0=ρ0c0=415kg/m2S, ρ0And c0Respectively atmospheric density and sound exists
Speed in air；ZmImpedance for entrant sound curtain to sound, Zm=j ω m, ω are sound wave angular frequency, and m is entrant sound curtain unit area
Effective mass.
Wherein, m1For the effective mass of air in sound penetrating hole, m1=ρ0(t+1.6r0)/a, t are entrant sound curtain thickness, r0It is saturating
The pore radius of acoustic aperture, a are through-hole rate.m2For the effective mass of entrant sound curtain puncherless part unit area, m2=ρ (1-a), ρ are
The density of sound curtain puncherless part.It is obtained after design parameter to be brought into the calculation formula of m:
In conjunction with formula D=20log | T | the variation that pad value D and entrant sound curtain unit area effective mass m can be obtained is closed
System.Fig. 1 is the variation schematic diagram of pad value and entrant sound curtain unit area effective mass.It is 5%, hole that through-hole rate is shown in Fig. 1
Radius is the variation of PET entrant sound curtain (no blind hole) pad value and entrant sound curtain unit area effective mass of 0.25mm, ordinate
The numerical value of initial voice intensity is subtracted for the intensity of sound through entrant sound curtain, abscissa is effective matter of entrant sound curtain unit area
Amount, from figure 1 it appears that the effective mass m of entrant sound curtain unit area is bigger, intensity of sound and initial sound through entrant sound curtain
The difference of loudness of a sound degree is bigger, i.e. the pad value of entrant sound curtain is bigger.
It is a that blind hole rate (area of all blind holes and the ratio of the entrant sound curtain gross area) is opened up on above-mentioned entrant sound curtain2, depth
For t2After blind hole, ignore the effective mass of air in blind hole, i.e. m1It is constant, m2=ρ (1-a)-ρ a2t2/ t, then
As can be seen from the above equation, the effective mass of entrant sound curtain unit area subtracts with the increase of blind hole rate and blind hole depth
It is small.In other words, after opening up blind hole on entrant sound curtain substrate, the effective mass of the unit area of entrant sound curtain reduces, and its with it is blind
Porosity a2With depth t2It is positively correlated.
Preferably, in order to obtain more preferable entrant sound effect while, guarantee its picture effect, the depth of the blind hole is entrant sound
The 1/5-4/5, the blind hole rate a of curtain base material thickness2It is 0.1% -50%.More preferably, it is contemplated that processing cost and difficult processing
Degree, the radius of the blind hole are 1-10 times of the pore radius of sound penetrating hole.
Clear, complete description is carried out below with reference to technical solution of the attached drawing to various embodiments of the present invention, it is clear that is retouched
The embodiment stated is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention,
Those of ordinary skill in the art's obtained every other embodiment without making creative work belongs to this
Invent protected range.
Embodiment one
Fig. 2 is the structural schematic diagram of entrant sound curtain embodiment one of the present invention.As shown in Figure 1, in the present embodiment, using thickness
For 0.3mm PVC roll material as entrant sound curtain substrate 110, entrant sound curtain is arranged in the sound penetrating hole 120 in a manner of square matrices
On substrate 110, the radius r of the sound penetrating hole 1200For 0.25mm, the square side length is 2mm；The blind hole 130 is located at every
The depth of the centre of two adjacent sound penetrating holes 120, the blind hole 130 is 0.2mm, radius 0.25mm, so that blind hole 130
The square matrices that side length is 1mm are collectively constituted with sound penetrating hole 120.
Specifically, when producing entrant sound curtain, entrant sound curtain substrate 110 is placed on perforation production line, such as roll-to-roll (roll
To roll) serializations such as laser drilling device or mechanical punch equipment punching production line, it can be according to the kind of entrant sound curtain substrate
Class, thickness, hole size adjust puncher parameter, utilize sound penetrating hole on the computer setting unit area screen connected with puncher
120 and blind hole 130 quantity and size, so that it is determined that on unit area entrant sound curtain sound penetrating hole 120 and blind hole 130 total perforation face
Product, i.e. through-hole rate and blind hole rate.
In the present embodiment, using laser boring, laser light source CO2Light source, power 30w-200w.When beating sound penetrating hole
It is that the power of laser light source is decreased to 80w when beating blind hole 130 by 150w by the power setting of laser light source when 120.
Since the frequency of sound wave range that human ear can be heard is 20Hz-20000Hz, to the entrant sound produced by the above method
Decaying of the curtain under different frequency of sound wave is tested, and test result is shown in Table 3 and table 4, and the subjects in table 3 are only to open up
The entrant sound curtain of acoustic aperture 120, the subjects in table 4 are the entrant sound curtain for offering blind hole 130 and sound penetrating hole 120.
Table 3
| Frequency/Hz | 500 | 2000 | 5000 | 8000 | 12500 | 20000 |
| Decaying/dB | 0.03 | 0.56 | 2.80 | 4.35 | 6.77 | 9.89 |
Table 4
| Frequency/Hz | 500 | 2000 | 5000 | 8000 | 12500 | 20000 |
| Decaying/dB | 0.02 | 0.24 | 1.33 | 2.81 | 5.06 | 7.11 |
From table 3 and table 4 as can be seen that under different frequency of sound wave, after adding blind hole 130, the pad value of entrant sound curtain
Decrease.
Embodiment two
Fig. 3 is the structural schematic diagram of entrant sound curtain embodiment two of the present invention.As shown in figure 3, in the present embodiment, using thickness
The entrant sound curtain is randomly arranged in as entrant sound curtain substrate 210, the sound penetrating hole 220 and blind hole 230 for the PVC roll material of 0.3mm
On substrate 210.The radius r of the sound penetrating hole 2200Depth for 0.25mm, the blind hole 230 is 0.2mm, and radius is
0.25mm。
The present embodiment uses laser boring, laser light source CO2Light source, power 30w-200w.When beating sound penetrating hole 220
When, it is that the power of laser light source is decreased to 80w when beating blind hole 230 by 150w by the power setting of laser light source.
What is different from the first embodiment is that 230 random alignment of sound penetrating hole 220 and blind hole in the present embodiment.It specifically, is guarantor
The through-hole rate for demonstrate,proving entrant sound curtain in the present embodiment is 5%, needs to open up 254777 entrant sounds on every square metre of entrant sound curtain substrate 210
Hole 220, for guarantee blind hole 230 blind hole rate be 15%, need to open up on every square metre of entrant sound curtain substrate 210 764331 it is blind
Hole 230.It should be noted that even if having a part blind hole 230 and 220 position of sound penetrating hole has and overlapping nor affects on image quality and entrant sound is imitated
Fruit.
Embodiment three
Fig. 4 is the structural schematic diagram of entrant sound curtain embodiment three of the present invention.As shown in figure 4, the present embodiment and one phase of embodiment
Than the radius r of the sound penetrating hole 32000.1mm is become from 0.25mm, the entrant sound curtain substrate 310 of entrant sound curtain and blind in the present embodiment
The structure in hole 330 is the same as example 1, and details are not described herein.
When the viewing of user distance is less than 3m-4m, if the radius of sound penetrating hole 320 is excessive, user is possible in viewing
See the sound penetrating hole 320 on entrant sound curtain, viewing experience is poor, and the reduced radius of sound penetrating hole 320 is 0.1mm by the present embodiment, improves
The viewing experience of user.
In conclusion the present invention by opening up blind hole on traditional entrant sound curtain, reduces the effective mass of entrant sound curtain, from
And in the case where not influencing entrant sound curtain reflectivity, improve entrant sound curtain entrant sound effect.
Claims (10)
1. a kind of entrant sound curtain, including entrant sound curtain substrate, which is characterized in that the entrant sound curtain substrate is equipped with multiple sound penetrating holes and more
A blind hole.
2. entrant sound curtain as described in claim 1, which is characterized in that the sound penetrating hole is regularly arranged or random alignment；It is described blind
Hole is regularly arranged or random alignment.
3. entrant sound curtain as claimed in claim 2, which is characterized in that described regularly arranged including matrix arrangement, equilateral triangle
Arrangement or annular array.
4. entrant sound curtain as claimed in claim 3, which is characterized in that the sound penetrating hole and the equal matrix arrangement of the blind hole, and institute
It states sound penetrating hole and the blind hole is spaced apart from each other arrangement.
5. entrant sound curtain as described in claim 1, which is characterized in that the through-hole rate of the sound penetrating hole is 0.5%-5%；It is described
The pore radius of acoustic aperture is 0.05mm-0.75mm.
6. entrant sound curtain as claimed in claim 5, which is characterized in that the blind hole rate of the blind hole is 0.1% -50%；It is described blind
The radius in hole is 1-10 times of the pore radius of the sound penetrating hole.
7. entrant sound curtain as described in claim 1, which is characterized in that the depth of the blind hole is the 1/5- of entrant sound curtain base material thickness
4/5。
8. a kind of manufacturing method of the entrant sound curtain as described in any one of claims 1 to 7, which is characterized in that the manufacturer
Method is to open up sound penetrating hole and blind hole on entrant sound curtain substrate.
9. manufacturing method as claimed in claim 8, which is characterized in that the blind hole it is regularly arranged on entrant sound curtain substrate or with
Machine arrangement.
10. manufacturing method as claimed in claim 9, which is characterized in that the blind hole rate of the blind hole is 0.1% -50%；Institute
The radius for stating blind hole is 1-10 times of pore radius of the sound penetrating hole.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810358980.0A CN110389496A (en) | 2018-04-20 | 2018-04-20 | Entrant sound curtain and its manufacturing method |
| PCT/CN2019/070522 WO2019200979A1 (en) | 2018-04-20 | 2019-01-05 | Sound-transmitting screen and manufacturing method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810358980.0A CN110389496A (en) | 2018-04-20 | 2018-04-20 | Entrant sound curtain and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110389496A true CN110389496A (en) | 2019-10-29 |
Family
ID=68239317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810358980.0A Pending CN110389496A (en) | 2018-04-20 | 2018-04-20 | Entrant sound curtain and its manufacturing method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110389496A (en) |
| WO (1) | WO2019200979A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021233444A1 (en) * | 2020-05-22 | 2021-11-25 | 深圳光峰科技股份有限公司 | Projection screen |
| WO2022042515A1 (en) * | 2020-08-24 | 2022-03-03 | 青岛海信激光显示股份有限公司 | Sound-producing screen and projection television |
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| GB281280A (en) * | 1926-11-27 | 1928-06-28 | Forest Phonofilms Ltd De | Improvements in or connected with motion picture screens |
| CN1846168A (en) * | 2003-09-02 | 2006-10-11 | 屏幕研究公司 | Projection screen, primarily for video projection that reduces the moire effect |
| CN101943850A (en) * | 2009-07-03 | 2011-01-12 | 鸿富锦精密工业（深圳）有限公司 | Sound-producing screen and projection system using same |
| CN201853063U (en) * | 2010-11-06 | 2011-06-01 | 浙江宇立塑胶有限公司 | Acoustical transmission projection curtain |
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| CN107479316A (en) * | 2017-09-06 | 2017-12-15 | 贵阳科创科技发展有限公司 | A kind of entrant sound projection spherical curtain plate, plane screen plate, curve curtain board, arc curtain plate and preparation method thereof |
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| CN102654725B (en) * | 2011-11-23 | 2014-08-13 | 上海华博信息服务有限公司 | Metal punching acoustic transmission curtain device |
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| GB281280A (en) * | 1926-11-27 | 1928-06-28 | Forest Phonofilms Ltd De | Improvements in or connected with motion picture screens |
| CN1846168A (en) * | 2003-09-02 | 2006-10-11 | 屏幕研究公司 | Projection screen, primarily for video projection that reduces the moire effect |
| CN101943850A (en) * | 2009-07-03 | 2011-01-12 | 鸿富锦精密工业（深圳）有限公司 | Sound-producing screen and projection system using same |
| CN102404656A (en) * | 2010-09-16 | 2012-04-04 | 潍坊歌尔电子有限公司 | Blind hole type microphone |
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| US9740089B1 (en) * | 2016-11-10 | 2017-08-22 | The Elumenati, Llc | Modular curved projection screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021233444A1 (en) * | 2020-05-22 | 2021-11-25 | 深圳光峰科技股份有限公司 | Projection screen |
| WO2022042515A1 (en) * | 2020-08-24 | 2022-03-03 | 青岛海信激光显示股份有限公司 | Sound-producing screen and projection television |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019200979A1 (en) | 2019-10-24 |
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Application publication date: 20191029 |
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| RJ01 | Rejection of invention patent application after publication |