CN108490727A - A kind of front projection screen that novel visual angle is controllable - Google Patents
A kind of front projection screen that novel visual angle is controllable Download PDFInfo
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- CN108490727A CN108490727A CN201810583939.3A CN201810583939A CN108490727A CN 108490727 A CN108490727 A CN 108490727A CN 201810583939 A CN201810583939 A CN 201810583939A CN 108490727 A CN108490727 A CN 108490727A
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- visual angle
- front projection
- projection screen
- novel visual
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- 229910052934 alunite Inorganic materials 0.000 claims 1
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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
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/602—Lenticular screens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
The invention discloses a kind of front projection screens that novel visual angle is controllable, including Fresnel Lenses layer, Fresnel Lenses layer includes the mirror unit that a circle circle is arranged parallel to each other, the operating angle of each mirror unit is remained unchanged in each region, and it is luminance curve that each mirror unit, which is formed by edge contour,.The present invention each mirror unit operating angle when each region is consistent, by the shape for changing each mirror unit (ellipse waits other luminance curves), rather than use traditional circular configuration, so as to change circumferencial direction level and upper and lower light energy allocation proportion everywhere, can improve the luminous energy of common circular Fresnel lens in the viewing areas of human eye up and down overshoot correction or so undercorrection the phenomenon that, realize effective control to the chief ray range at visual angle, enable the chief ray direction of downwards angle of visibility and horizontal view angle and meanwhile rationally inject human eye within the scope of, meet practical viewing demand, realize preferable viewing experience.
Description
Technical field
The present invention relates to a kind of projection screen, more particularly to a kind of front projection screen that novel visual angle is controllable.
Background technology
Existing ultrashort burnt front projection screen is imaged by way of scattering mostly, such as white plastic curtain, is not had to ambient light
Selectivity, causes influence of the ambient light to drop shadow effect very big, and when ambient light is brighter, the contrast of Projection Display is lower,
Display effect is poorer.
In order to overcome disadvantages described above, people that circular Fresnel lens has been used to add scattering diluent to realize on the projection screen.
The off-centre operation structure that traditional circular Fresnel lens are arranged parallel to each other on front view for a circle circle, utilizes circular curvature pair
The chief ray direction of horizontal view angle is controlled, using the zigzag protrusion on circular Fresnel lens to the key light of upper downwards angle of visibility
Line direction is controlled.Circular Fresnel lens can not only change projector's chief ray in the reasonable layout in viewing space, go back
The influence that a part of ambient light can be eliminated, improves the contrast of screen, scattering diluent then provides viewing visual angle.By but in its own original
Reason is limited, and existing circular Fresnel lens are difficult that people is rationally injected in the chief ray direction of upper downwards angle of visibility and horizontal view angle simultaneously
Within the scope of eye, preferable viewing experience is realized.
Invention content
It is an object of the invention to overcome the above-mentioned deficiency in the presence of the prior art, it is controllable to provide a kind of novel visual angle
Front projection screen.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical schemes：
A kind of front projection screen that novel visual angle is controllable, including Fresnel Lenses layer, the Fresnel Lenses layer include
The mirror unit that one circle circle is arranged parallel to each other, the operating angle of each mirror unit are remained unchanged in each region, and
It is luminance curve that each mirror unit, which is formed by edge contour,.
Operating angle of the present invention is the angle of the working face and substrate of Fresnel Lenses, and the present invention is in each minute surface list
For the operating angle of member when each region is consistent, by changing the shape of each mirror unit, (ellipse waits other high-orders
Curve), rather than traditional circular configuration is used, so as to change circumferencial direction level and upper and lower light energy point everywhere
With ratio, the luminous energy of common circular Fresnel lens overshoot correction or so school up and down in the viewing areas of human eye can be improved
Positive insufficient phenomenon, realizes effective control to the chief ray range at visual angle so that the chief ray of upper downwards angle of visibility and horizontal view angle
Direction can rationally be injected within the scope of human eye simultaneously, meet practical viewing demand, realize preferable viewing experience.And each minute surface
The operating angle of unit is consistent in each region, only the shape by changing mirror unit, so that it may to realize to chief ray
The control in direction, more convenient processing, high precision machining.
Preferably, the shape of the luminance curve is ellipse or parabola shaped.
Preferably, multiple cylinder micro units being vertically arranged are superimposed on each mirror unit.Projection ray passes through
When crossing the cylinder micro unit, the reflection of larger angle can occur along the component in screen level direction, so as to be carried for screen
For larger horizontal view angle, expands horizontal view angle using cylinder micro unit, improve the uniformity of screen.
Preferably, each mirror unit includes working face and interference surface, and the cylinder micro unit is set on described
On working face, facilitate processing, avoids generating additional interference light.
Preferably, the cylinder micro unit is arc rod structure or triangular prism structure, which is that cross-sectional edge is
The column structure of arc, and cylinder micro unit surface is relative to the mirror unit concave or convex.Including at least following
Three kinds of situations, first, the cylinder micro unit is made of the identical arc column of several sizes, all arc columns mutually interconnect
It connects and is arranged in array-like；Second, the cylinder micro unit is made of the identical triangular prism of several sizes, all trigones
Column is connected with each other and is arranged in array-like；Third, the cylinder micro unit is by the identical arc column of several sizes and several
The identical triangular prism of size is constituted, and all arc columns and the triangular prism are connected with each other and mix and be arranged in array-like.
Preferably, the Fresnel Lenses layer is fitted on supporting layer, and between the Fresnel Lenses layer and supporting layer
Equipped with reflecting layer.The reflecting layer is made of metal materials such as silver, aluminium, has high visible reflectivity, is used for episcopic projector
Incident light.
Preferably, the reflecting layer is positioned only on the working face of the mirror unit, is also sent out to can avoid interference surface
Life reflects and generates interference light, is conducive to the clarity and contrast that improve screen.
Preferably, the interference surface of the mirror unit is provided with pitch-dark film, to absorb ambient light, improves contrast.
Preferably, the layer of penetrating is bonded together by adhesive linkage and the supporting layer, and is mixed in the adhesive linkage
Black pigment improves contrast to absorb ambient light.
Preferably, the supporting layer is the curved-surface structure with concave curvature.Using the amount of curvature of curve support layer
The chief ray direction of horizontal view angle is controlled, to which screen gain can be improved, and entire screen is arranged to indent
The hard screen of curvature, can effectively improve the viewing uniformity, improve the contrast of entire screen, obtain better viewing experience.
Preferably, layer after the supporting layer includes support front layer, support middle level and supports, and the support middle level is honeycomb
Harden structure.Supporting layer plays the role of support protection to entire screen, and entire screen can be not only reduced using honeycomb plate structure
Weight, and intensity and environmental requirement can be met.
Preferably, the supporting layer is made using flexible material, to which entire screen can be bent, is not take up transport
Space can substantially save transportation cost.When mounted, it can crimp and be accommodated in house eminence, when use, just puts down, so as to
To reduce installation space, and avoid the problem of screen is chronically exposed in air, becomes easily infected by dust.
Preferably, the material of the supporting layer is cloth, polyurethane, PVC or PC.
Preferably, the screen further includes protective layer, dyed layer, smooth solid power layer and scattering layer.The protective layer is height
Molecular composite material layer, light transmittance is high, and screen can be effectively prevent to be scratched or be contaminated；The dyed layer is more than by transmitance
85% high transmittance resin uniformly adds pigment and is made, and the contrast of screen can be improved；The smooth solid power layer is using high saturating
Rate resin material, such as PET, PC, PMMA are crossed, the impact strength of screen and the tolerance to environment are can effectively improve, and
The basis of covering can be smeared as other layers；The scattering layer can be process by adding scattering diluent in colloid, to
Screen viewing visual angle is provided.
Preferably, the protective layer and dyed layer, which are processed as one, is combined into one layer, when processing in the colloid of protective layer
The pigment of the even mixing dyed layer, it is i.e. plastic after to be dried or photocuring.Both processing had been facilitated, and screen can be further decreased
The thickness of curtain helps to promote drop shadow effect.
Preferably, the dyed layer peace solidating power layer, which is processed as one, is combined into one layer, when processing, in PC, PMMA or PET
Uniform hybrid pigment in equal resins or monomer solution, then squeeze out the modes machine-shapings such as stretching or heat cure by being molded.Both side
Just it processes, and the thickness of screen can be further decreased, contribute to the clarity for promoting drop shadow effect.
Preferably, the smooth solid power layer and scattering layer, which are processed as one, is combined into one layer, when processing, in PC, PMMA or PET
Scattering diluent is uniformly mixed in equal resins or monomer solution, then squeezes out the modes machine-shapings such as stretching or heat cure by being molded.Both
Facilitate processing, and the thickness of screen can be further decreased, contributes to the clarity for promoting drop shadow effect.
Preferably, the dyed layer, smooth solid power layer and scattering layer three, which are processed as one, is combined into one layer, when processing,
Scattering diluent and pigment are uniformly mixed in the resins such as PC, PMMA or PET or monomer solution, then squeeze out stretching or heat cure by being molded
Etc. modes machine-shaping.Both processing had been facilitated, and the thickness of screen can be further decreased, and helped to promote the clear of drop shadow effect
Degree.
Preferably, the dyed layer and scattering layer, which are processed as one, is combined into one layer, in colloid of the transmitance more than 85%
Scattering diluent and coloring pigment are mixed, the colloid mixed is uniformly coated in PC, PMMA or PET sheet surface, then pass through
The modes machine-shaping such as photocuring or heat cure.Both processing had been facilitated, and the thickness of screen can be further decreased, and helped to be promoted
The clarity of drop shadow effect.
Preferably, the surface of the protective layer is processed as cloudy surface or hair side, prevents external environmental light from being generated in screen surface
Orienting reflex.
Preferably, the case hardness of the protective layer is more than 2H, prevents from scratching.
Preferably, the screen is additionally provided with the frame being connected to around the supporting layer and above layers, by each layer and branch
It supports laminated at an entirety, facilitates installation, transport and carrying.
Preferably, it is additionally provided with hook on the supporting layer, facilitates installation.
Compared with prior art, beneficial effects of the present invention：
1, operating angle of the present invention is the angle of the working face and substrate of Fresnel Lenses, and the present invention is in each minute surface
The operating angle of unit is when each region is consistent, by shape (other height such as ellipse for changing each mirror unit
Rank curve), rather than traditional circular configuration is used, so as to change circumferencial direction level and upper and lower light energy everywhere
Allocation proportion can improve the luminous energy of common circular Fresnel lens overshoot correction or so up and down in the viewing areas of human eye
The phenomenon that undercorrection, realizes effective control to the chief ray range at visual angle so that the key light of upper downwards angle of visibility and horizontal view angle
Line direction can rationally be injected within the scope of human eye simultaneously, meet practical viewing demand, realize preferable viewing experience.And each mirror
The operating angle of face unit is consistent in each region, only the shape by changing mirror unit, so that it may to realize to key light
The control in line direction, more convenient processing, high precision machining.
2, reflecting layer is positioned only on the working face of the mirror unit, to which reflection also occurs for avoidable interference surface and is produced
Raw interference light is conducive to the clarity and contrast that improve screen；Interference surface is provided in pitch-dark film or adhesive linkage and is mixed with
Black pigment improves contrast to absorb ambient light；It is superimposed with multiple columns being vertically arranged on each mirror unit
Face micro unit expands horizontal view angle using cylinder micro unit, improves the uniformity of screen.
3, the supporting layer is the curved-surface structure with concave curvature, is regarded to level using the amount of curvature of curve support layer
The chief ray direction at angle is controlled, and to which screen gain can be improved, and entire screen is arranged to have the hard of concave curvature
Matter screen can effectively improve the viewing uniformity, improve the contrast of entire screen, obtain better viewing experience；The support
Layer is made using flexible material, can be bent to entire screen, is not take up transport space, can substantially save transport at
This.When mounted, it can crimp and be accommodated in house eminence, when use just puts down, and so as to reduce installation space, and avoids
The problem of screen is chronically exposed in air, becomes easily infected by dust.
Description of the drawings：
Fig. 1 is the front view of the Fresnel Lenses layer described in the embodiment of the present invention 1.
Fig. 2 is the A-A sectional views of Fig. 1.
Fig. 3 is the B-B sectional views of Fig. 1.
Fig. 4 is the light path schematic diagram (vertical direction) of the front projection screen described in the embodiment of the present invention 1.
Fig. 5 is the light path schematic diagram (horizontal direction) of the front projection screen described in the embodiment of the present invention 1.
Fig. 6 is the structural schematic diagram of the Fresnel Lenses layer with cylinder micro unit described in the embodiment of the present invention 2.
Fig. 7 is that the light path schematic diagram of the Fresnel Lenses layer with cylinder micro unit described in the embodiment of the present invention 2 is (horizontal
Direction).
Fig. 8 is the structural schematic diagram of the front projection screen described in the embodiment of the present invention 3.
Fig. 9 is the structural schematic diagram of the front projection screen described in the embodiment of the present invention 4.
Figure 10 is the schematic diagram of the curve support layer curvature described in the embodiment of the present invention 5.
Figure 11 is the light path schematic diagram (horizontal direction) of the front projection screen described in the embodiment of the present invention 5.
Figure 12 is the structural schematic diagram of the front projection screen described in the embodiment of the present invention 7.
It is marked in figure：1- protective layers, 2- dyed layers, the smooth solid power layers of 3-, 4- scattering layers, 5- Fresnel Lenses layers, 51- mirrors
Face unit, 511- working faces, 512- interference surfaces, 513- substrates, 52- cylinder micro units, 6- hooks, the reflecting layer 7-, 8- adhesive linkages,
9- supporting layers, 91- support front layer, 92- to support middle level, layer after 93- supports, 10- frames, the pitch-dark films of 11-.
Specific implementation mode
With reference to test example and specific implementation mode, the present invention is described in further detail.But this should not be understood
It is only limitted to embodiment below for the range of the above-mentioned theme of the present invention, it is all that this is belonged to based on the technology that the content of present invention is realized
The range of invention.
Embodiment 1
As shown in Figure 1-Figure 3, a kind of front projection screen that novel visual angle is controllable, including Fresnel Lenses layer 5, the phenanthrene
Nie Er lens jackets 5 include the mirror unit 51 that a circle circle is arranged parallel to each other, and each mirror unit 51 includes working face
511 and interference surface 512 and substrate 513, the working face 511 of Fresnel Lenses be set as operating angle with the angle of substrate 513.Each institute
The operating angle for stating mirror unit 51 is remained unchanged in each region, and each mirror unit 51 is formed by edge contour
Shape for luminance curve, the luminance curve is ellipse or parabola shaped.
As shown in fig. 4-5, in the operating angle of each mirror unit when each region is consistent (i.e. in A- in figure
At A sections and B-B sections, operating angle a1=b1, a2=b2, a3=b3 that section view obtains), by changing each mirror unit
Shape (ellipse equal other luminance curves), rather than use traditional circular configuration, it is each so as to change circumferencial direction
Place's level and upper and lower light energy allocation proportion, can improve viewing of the luminous energy in human eye of common circular Fresnel lens
Above and below in region the phenomenon that overshoot correction or so undercorrection, effective control to the chief ray range at visual angle is realized so that on
The chief ray direction of downwards angle of visibility and horizontal view angle can rationally be injected within the scope of human eye simultaneously, meet practical viewing demand, realize
Preferable viewing experience.And the operating angle of each mirror unit is consistent in each region, only by changing mirror unit
Shape, so that it may to realize control to chief ray direction, more convenient processing, high precision machining.
Embodiment 2
As shown in fig. 6, the present embodiment is with embodiment 1, difference lies on the working face 511 of each mirror unit 51
It is superimposed with multiple cylinder micro units 52 being vertically arranged, the cylinder micro unit 52 is arc rod structure or triangular prism structure,
And 52 surface of cylinder micro unit is relative to 51 concave or convex of the mirror unit, as shown in fig. 7, utilizing cylinder micro unit
Expand horizontal view angle, improves the uniformity of screen.
Embodiment 3
As shown in figure 8, the present embodiment is with embodiment 1, difference lies in the Fresnel Lenses layer 5 is pasted by adhesive linkage 8
It closes on supporting layer 9, layer 93 after the supporting layer 9 includes support front layer 91, support middle level 92 and supports, the support middle level 92
For honeycomb plate structure, and reflecting layer 7 is equipped between the Fresnel Lenses layer 5 and supporting layer 9.The reflecting layer 7 is positioned only at
On the working face 511 of the mirror unit 51, to which reflection also occurs for avoidable interference surface and interference light is generated, is conducive to carry
The clarity and contrast of high screen.The interference surface 512 of the mirror unit 51 is provided with pitch-dark film 11, to absorb environment
Light improves contrast.
Embodiment 4
As shown in figure 9, the present embodiment and embodiment 3 difference lies in the interference surface 512 of, the present embodiment be not provided with it is pitch-dark
Film, but black pigment is mixed in the adhesive linkage 8, it can equally play the role of absorption ambient light, improve contrast.
Embodiment 5
As shown in Figure 10, the present embodiment the difference from example 2 is that, the Fresnel Lenses layer 5 is pasted by adhesive linkage 8
It closes on supporting layer 9, the supporting layer 9 is the curved-surface structure with concave curvature, the width W and curvature half of the supporting layer 9
The ratio of diameter R is W/R=1-10.
It as shown in figure 11, can be to water using the amount of curvature of curve support layer 9 when curve support layer 9 passes through in projection ray
The chief ray direction at head-up angle control effectively, and to which screen gain can be improved, and entire screen is arranged to indent
The hard screen of curvature, can effectively improve the viewing uniformity, improve the contrast of entire screen, obtain better viewing experience.
Embodiment 6
The present embodiment the difference from example 2 is that, the Fresnel Lenses layer 5 is fitted in supporting layer 9 by adhesive linkage 8
On, the supporting layer 9 is made using flexible material, and the material of the supporting layer is cloth, polyurethane, PVC or PC.To whole
A screen can be bent, and be not take up transport space, can substantially save transportation cost.When mounted, it can crimp and be accommodated in house
Eminence, when use, just put down, and so as to reduce installation space, and avoid screen and are chronically exposed in air, are easy to be stained with
The problem of contaminating dust.
Embodiment 7
As shown in figure 12, the present embodiment and embodiment 3 difference lies in, the screen further include protective layer 1, dyed layer 2,
Smooth solid power layer 3 and scattering layer 4, the dyed layer 2, smooth solid power layer 3 and 4 three of scattering layer are processed as one and are combined into one layer.
The screen is additionally provided with the frame 10 being connected to around the supporting layer 9 and above layers, by each layer and supporting layer 9
An entirety is synthesized, installation, transport and carrying are facilitated.It is additionally provided with hook 6 on the supporting layer 9, facilitates installation.
Above example is only to illustrate the present invention and not limits technical solution described in the invention, although this explanation
Book is with reference to above-mentioned each embodiment to present invention has been detailed description, but the present invention is not limited to above-mentioned specific implementation
Mode, therefore any modify to the present invention or equivalent replacement；And the technical side of all spirit and scope for not departing from invention
Case and its improvement, are intended to be within the scope of the claims of the invention.
Claims (14)
1. a kind of front projection screen that novel visual angle is controllable, including Fresnel Lenses layer (5), which is characterized in that the phenanthrene alunite
Your lens jacket (5) includes the mirror unit (51) that a circle circle is arranged parallel to each other, the operating angle of each mirror unit (51)
It is remained unchanged in each region, and it is luminance curve that each mirror unit (51), which is formed by edge contour,.
2. a kind of front projection screen that novel visual angle is controllable according to claim 1, which is characterized in that the high-order is bent
The shape of line is ellipse or parabola shaped.
3. a kind of front projection screen that novel visual angle is controllable according to claim 1, which is characterized in that each mirror
Multiple cylinder micro units (52) being vertically arranged are superimposed on face unit (51).
4. a kind of front projection screen that novel visual angle is controllable according to claim 3, which is characterized in that each mirror
Face unit (51) includes working face (511) and interference surface (512), and the cylinder micro unit (52) is set to the working face
(511) on.
5. a kind of front projection screen that novel visual angle is controllable according to claim 3, which is characterized in that the cylinder is micro-
Unit (52) is arc rod structure or triangular prism structure, and cylinder micro unit (52) surface is relative to the mirror unit
(51) concave or convex.
6. a kind of front projection screen that novel visual angle is controllable according to claim 4, which is characterized in that the Fresnel
Lens jacket (5) is fitted on supporting layer (9), and is equipped with reflecting layer (7) between the Fresnel Lenses layer (5) and supporting layer (9).
7. a kind of front projection screen that novel visual angle is controllable according to claim 6, which is characterized in that the reflecting layer
(7) it is positioned only on the working face (511) of the mirror unit (51).
8. a kind of front projection screen that novel visual angle is controllable according to claim 7, which is characterized in that the minute surface list
The interference surface (512) of first (51) is provided with pitch-dark film (11).
9. a kind of front projection screen that novel visual angle is controllable according to claim 7, which is characterized in that described to penetrate layer
(7) it is bonded together by adhesive linkage (8) and the supporting layer (9), and black pigment is mixed in the adhesive linkage (8).
10. a kind of front projection screen that novel visual angle is controllable according to claim 6, which is characterized in that the support
Layer (9) is the curved-surface structure with concave curvature.
11. a kind of front projection screen that novel visual angle is controllable according to claim 10, which is characterized in that the support
Layer (93) after layer (9) includes support front layer (91), support middle level (92) and supports, and the support middle level (92) is that honeycomb is hardened
Structure.
12. a kind of front projection screen that novel visual angle is controllable according to claim 6, which is characterized in that the support
Layer (9) is made using flexible material.
13. according to a kind of any front projection screens that novel visual angle is controllable of claim 1-12, which is characterized in that institute
It further includes protective layer (1), dyed layer (2), smooth solid power layer (3) and scattering layer (4) to state screen.
14. a kind of front projection screen that novel visual angle is controllable according to claim 13, which is characterized in that the protection
Layer (1) and dyed layer (2), which are processed as one, is combined into one layer or the dyed layer (2) peace solidating power layer (3) is processed as one conjunction
For one layer or the smooth solid power layer (3) and scattering layer (4) are processed as one and are combined into one layer or the dyed layer (2) and scatter
Layer (4), which is processed as one, to be combined into one layer or the dyed layer (2), smooth solid power layer (3) and scattering layer (4) three and is processed as one
Body is combined into one layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810583939.3A CN108490727A (en) | 2018-06-07 | 2018-06-07 | A kind of front projection screen that novel visual angle is controllable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810583939.3A CN108490727A (en) | 2018-06-07 | 2018-06-07 | A kind of front projection screen that novel visual angle is controllable |
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| CN108490727A true CN108490727A (en) | 2018-09-04 |
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| CN201810583939.3A Pending CN108490727A (en) | 2018-06-07 | 2018-06-07 | A kind of front projection screen that novel visual angle is controllable |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111538204A (en) * | 2020-06-22 | 2020-08-14 | 成都菲斯特科技有限公司 | Reflection-type projection screen and projection system |
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| CN111624843B (en) * | 2020-07-28 | 2021-02-12 | 成都菲斯特科技有限公司 | Optical projection screen and projection system |
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Application publication date: 20180904 |