CN106154730B - A kind of projection screen for increasing contrast and brightness and preparation method thereof - Google Patents
A kind of projection screen for increasing contrast and brightness and preparation method thereof Download PDFInfo
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- CN106154730B CN106154730B CN201610463152.4A CN201610463152A CN106154730B CN 106154730 B CN106154730 B CN 106154730B CN 201610463152 A CN201610463152 A CN 201610463152A CN 106154730 B CN106154730 B CN 106154730B
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
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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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention discloses a kind of projection screen for increasing contrast and brightness and preparation method thereof, scattering layer including transmission layer and on surface after transmission layer, the transmission layer is microlens array, some and one-to-one fringe area of lenticule is distributed with the scattering layer, is extinction area between adjacent fringe area；The distribution of fringe area is as follows：So that, as the origin of coordinates (0,0), the coordinate of fringe area center corresponding to each lenticule is (δ at projected light vertical incidencex, δy), wherein, , X, Y are position coordinates of the lenticule in screen；L is vertical range of the projection screen apart from projecting apparatus；F is the focal length of lenticule.Ensure that all light from projecting apparatus are all scattered by the special distribution mode of fringe area on reflecting layer and extinction area in the present invention, and all ambient lights are all absorbed.
Description
Technical field
The present invention relates to a kind of projector equipment, and in particular to a kind of projection screen for increasing contrast and brightness.
Background technology
Projection screen is one of product most-often used in projector's peripheral equipment, and projection screen is arranged in pairs or groups with projector to be made
With the perspective plane of the enlarged drawing used in image audiovisual in the displaying of exhibition, association etc. or movie theatre etc., having used various
Screen.
Projection screen generally can be divided into the reflective, class of transmission-type two；Reflective to be used to just throw, transmission-type is used for rear-projection；It is positive to throw
Curtain is divided into plane screen, arc screen again；Plane screen can be divided into glass bead screen, metal curtain, embossing plastics curtain, elastic curtain etc. from quality
(embossing plastics are divided into white modeling, ash modeling, silver modeling etc.).
In existing projection screen such as reflectivity screen, there are the following problems：Due in throwing of the reflection from projector
Shadow light and while show projected image, also reflect light, the sunshine from window entrance that the ambient light in the external world such as illuminates, institute
With in bright place, as the contrast reduction of the brightness of " white (high-high brightness) " and " black (minimum brightness) ", so as to be difficult to
Realize that distinct image is shown.
For example, the Chinese utility model patent that Authorization Notice No. is CN203365902U discloses a kind of high definition 3D rear projection screens
Curtain, including transmission layer, imaging layer and scattering layer, the transmission layer, the imaging layer connect with the scattering layer successively pressure viscosity, institute
It is irregular particle scattering layer to state scattering layer.
Publication No. CN104317153A Chinese invention patent application document discloses a kind of screen for projector,
Including the guide layer, beam splitter layer and basic unit stacked gradually；The guide layer is used to guide from outside to enter with first direction scope
The throw light penetrated makes the throw light with more than in the interface shape to the interface between the guide layer and beam splitter layer
Into the incident angles of total reflection to the interface, the outside of the guide layer is then reflected back；The guide layer is additionally operable to draw
Lead from outside with the ambient light of second direction range incident to the interface between the guide layer and beam splitter layer, and make the ring
Environmental light then passes through the interface to form the incident angles being totally reflected to the interface less than or equal at the interface
Into beam splitter layer；The refractive index of the beam splitter layer is less than the refractive index of the guide layer.Reduce the dazzle caused by ambient light
Phenomenon.
Reason can also be reduced by suppressing sunshine, illumination light etc. as contrast by solving the problem in traditional method
Outer light influence and reduce minimum brightness and realize the high-contrast in room.
Also have by by the projection screen of environment light absorbs, such as Publication No. CN 103605258A Chinese invention patent
Application documents disclose a kind of environment resistant light projection screen, it is characterised in that the rear projection screen is by projection imaging film, grating layer
And anti-dazzle photosphere is sequentially compounding, grating layer is compound in the front side surface of the projection imaging film, is provided with the grating layer
Several horizontal and spaced ink layers, the ink layer are used to absorb ambient light, reduce ambient light and imaging is done
Disturb；The anti-dazzle photosphere is compound in the front side surface of grating layer, for anti-dazzle, eliminates mirrored effect..Pass through in the projection screen
One layer of grating layer of surface recombination of projection imaging film, and ambient light is absorbed by spaced ink layer inside grating layer,
So as to reduce the influence of ambient light.But there are the following problems for the projection screen, it is impossible to ensures that all light from projecting apparatus can
It is projected, and all ambient lights can be absorbed, contrast increase DeGrain.
The content of the invention
The present invention provides a kind of projection screen for increasing contrast and brightness, and solving existing projection screen can not be by environment
Light all absorbs, projected light all scatters or the technical problem of projection.
A kind of projection screen for increasing contrast and brightness, including transmission layer and the scattering on surface after transmission layer
Layer, the transmission layer is microlens array, and some and one-to-one fringe area of lenticule is distributed with the scattering layer, adjacent
It is extinction area between fringe area；The distribution of fringe area is as follows：
Using at projected light vertical incidence in plane where projection screen as the origin of coordinates (0,0), corresponding to each lenticule
The coordinate of fringe area center is (δx, δy), wherein,
X, Y are position coordinates of the corresponding lenticule in screen；
L is vertical range of the projection screen apart from projecting apparatus；
F is the focal length of lenticule.
At projected light vertical incidence, fringe area is located at the optical axis after corresponding to lenticule, it is preferable that projected light is from screen
Vertical incidence at the heart, i.e., preferably using screen center as the origin of coordinates.Under the preferred arrangement, at the center of projection screen, dissipate
Penetrate at the optical axis after area is located at corresponding lenticule, being distributed in for fringe area assumes that projecting apparatus sentences directional light from projection screen center
Set on the basis of incidence, therefore in use, projecting apparatus from vertical incidence at projection screen center；Use is such as needed in projecting apparatus
Occasion that can not be incident at screen center, then the distribution of fringe area using the lenticule at the parallel incidence of projecting apparatus incident ray as
The origin of coordinates, at other positions the distribution of fringe area calculated by above-mentioned formula.
Screen of the present invention is made up of two parts, and a part is microlens array, and another part is the scattering material by high reflection
The scattering layer that material and black light-absorbing material are mixed to form, the illumination sent by projecting apparatus, which is mapped on lenticule, converges to the lenticule
It is scattered back and on corresponding high reflection scattering material, and extraneous ambient light can converge in black light-absorbing material after lenticule
On material, scattering will not be produced.The contrast of Projection Display can be increased by this method, reduce the influence of ambient light, due to throwing
Shadow instrument external environmental light when working by day is very bright, has a strong impact on contrast ratio of projector, for projecting apparatus in work on daytime
When work, the screen, which has, becomes apparent from effect.
The angle that screen diverse location receives the light from projecting apparatus is different, in order that projector is different in the present invention
Light in angular illumination to screen can be gone back by scattering, the high reflection material scattering region on screen and black material extinction area
Domain to be distributed in the distribution of screen diverse location different, pass through the special distribution in fringe area on reflecting layer and extinction area in the present invention
Mode ensures that all light from projecting apparatus are all scattered, and all ambient lights are all absorbed.
The fringe area is high reflection material, and the extinction area is black light-absorbing material.
The high reflection material is titanium dioxide either barium sulfate powder, and the black light-absorbing material is carbon dust.
Preferably, in microlens array the radius R of lens and the ratio range in lens cycle between 0.55~2.5,
The lens cycle is 0.2mm~1mm.The lens cycle refers to the distance between adjacent lens.
Preferably, on the scattering layer in region corresponding with each lenticule in microlens array fringe area area
Account for 1/6~1/2.
The present invention also provides a kind of preparation method for the projection screen for increasing contrast and brightness, and above-mentioned projection screen is preferred
Prepared, comprised the following steps using this method：
(1) microlens array is prepared using mould pressing method；
(2) it is applied to after being well mixed scattering powder and ultraviolet glue on the rear surface of microlens array；
(3) use UV source light irradiation microlens array, irradiated after microlens array on surface by micro lens light beam
The epoxy glue in region is formed by curing fringe area；
(4) uncured epoxy glue is washed away after step (3) curing process, then uniformly mixed in uncured region coating
The carbon dust and resin solution of conjunction, dry to form extinction area.
Preferably, the method for ultraviolet source irradiation microlens array is small-bore directional light scan mode in step (3).
Carry out the incident angle of light of projecting apparatus during the incident angle simulation use of its ultraviolet light during small-bore parallel optical scanning.
Preferably, the method for ultraviolet light microlens array works for big angle of visual field simulated projections machine in step (3)
Mode.
Big angle of visual field simulated projections machine working method be ultraviolet source and projecting apparatus set location and incident angle it is consistent.
Preferably, at the center of ultraviolet source face projection screen, i.e., the lenticule at projection screen center, from ultraviolet
The ultraviolet parallel light of light source is incident.
Mould pressing method is this area conventional method；The intensity and irradiation time of ultraviolet light need to adjust according to scene, so that
Scattering layer solidification is defined.
Powder is scattered using this area routinely scattering powder, such as can be selected from titanium dioxide and barium sulfate powder.
Ultraviolet glue uses this area Conventional UV glue, such as can be selected from the 408 of LOCTITE, 4201,414.
In the manufacturing process of the present invention, the mixing quality of powder and ultraviolet glue is scattered than, the quality of resin solution, resin solution
The mixing quality ratio of concentration and carbon dust and resin solution uses this area conventional parameter.
The present invention also provides the projection screen of the increase contrast that a kind of preparation method is prepared and brightness.
Compared with prior art, the invention has the advantages that：
The illumination sent in the present invention as projecting apparatus, which is mapped on lenticule, converges to high reflection scattering corresponding to the lenticule
It is scattered back and on material, and extraneous ambient light can be converged on black light-absorbing material, will not produced scattered after lenticule
Penetrate.The contrast of Projection Display can be increased by this method, reduce the influence of ambient light.
Ensure by the special distribution mode in fringe area on reflecting layer and extinction area all to come from projecting apparatus in the present invention
Light all scattered, and all ambient lights are all absorbed.
Brief description of the drawings
Fig. 1 is the basic composition figure of projection screen of the present invention.
Fig. 2 is the working state figure of light irradiation that projecting apparatus is sent on screen.
Fig. 3 is the working state figure that ambient light is radiated on screen.
Fig. 4 is the angular distribution figure that screen receives the light that projecting apparatus irradiation comes.
Fig. 5 a, Fig. 5 b and Fig. 5 c are that the state diagram that the illumination that projecting apparatus is sent is mapped to when at screen diverse location (is wherein schemed
5a is screen centre position, Fig. 5 b are deviation screen centre position, Fig. 5 c are screen edge locations).
Fig. 6 a and Fig. 6 b are microlens array schematic diagrames.
Fig. 7 is ultraviolet glue-line of the plane painting with scattering powder after microlens array.
Fig. 8 is ultraviolet source scanning irradiation solidification ultraviolet glue.
Fig. 9 is a kind of implementation of simulated projections machine working method illumination solidification ultraviolet glue.
Figure 10 is another implementation of simulated projections machine working method illumination solidification ultraviolet glue.
Figure 11 is the microlens array and ultraviolet glue-line after exposure.
Figure 12 is the microlens array and ultraviolet glue-line after being cleaned with solvent.
Figure 13 is the microlens array and ultraviolet glue-line after flour-carbon resin coating.
Figure 14 is the cooperation schematic diagram of central area lenticule and fringe area.
Figure 15 is upper right corner lenticule and fringe area cooperation schematic diagram such as figure.
Figure 16 is upper left corner lenticule and fringe area cooperation schematic diagram.
Figure 17 is lower left corner lenticule and fringe area cooperation schematic diagram.
Figure 18 is lower right corner lenticule and fringe area cooperation schematic diagram.
Reference is as follows shown in figure：
10- projection screen 20- projecting apparatus 11- transmission layers
12- scattering layer 121- fringe area 122- extinctions area
A- projecting apparatus outgoing beams b- scatters light c- ambient lights
111- lenticules
Embodiment
For the structure of projection screen 10 of the present invention as shown in figure 1, being made up of two parts, a part is to be made up of microlens array
Transmission layer 11 and be compounded in the scattering extinction distribution layer (scattering layer 12) at the microlens array back side, scatter and dissipated on extinction distribution layer
Penetrate in area 121 and extinction area 122 and be spaced apart.
Transmission layer 11 is formed (as shown in figures 6 a and 6b), in microlens array by some array arrangements of lenticule 111
The radius R of lens and the ratio range in the cycle of lens are between 0.75~2.5, and the cycle of microlens array is 0.3 millimeter~1
Millimeter scope, the corresponding fringe area of a lenticule.
Because the angle that screen diverse location receives the light from projecting apparatus is different (as shown in Figure 4), ambient light
In order that the light that projector's different angle is irradiated on screen can be gone back by scattering, (light irradiation that projecting apparatus is sent is on screen
Working state figure as shown in Fig. 2 in figure a be projecting apparatus outgoing beam, b be scattering light), and ambient light is absorbed (environment
Working state figure of the light irradiation on screen as shown in figure 3, in figure c be ambient light, b be scattering light), the high reflection material on screen
Material scattering region and black material absorbance region to be distributed in the different position distribution of screen different.Dissipated at screen diverse location
Penetrate the distribution in area as and Figure 14~Figure 17 shown in, the working state figure of projecting apparatus is sent at diverse location light irradiation on screen
As shown in Fig. 5 a~Fig. 5 c.
The distribution mode of fringe area is following (to assume that screen center is said exemplified by being the origin of coordinates in present embodiment
It is bright)：
Using screen center as the origin of coordinates (0,0), the coordinate of fringe area center corresponding to each lenticule is (δx,
δy), wherein,
X, Y are position coordinates of the corresponding lenticule in screen (using coordinate at the center of corresponding lenticule to be most accurate)；
L is vertical range of the projection screen apart from projecting apparatus；
F is the focal length of lenticule.
At the center of projection screen, fringe area is at the optical axis after corresponding lenticule (as shown in Fig. 5 a and Figure 14)；
Upper right corner lenticule and fringe area cooperation schematic diagram are as shown in figure 15；Upper left corner lenticule and fringe area cooperation schematic diagram such as Figure 16
It is shown；Lower left corner lenticule and fringe area cooperation schematic diagram are as shown in figure 17；Lower right corner lenticule and fringe area cooperation schematic diagram
As shown in figure 18.
The preparation method of projection screen of the present invention is as follows：
(1) microlens array is prepared using conventional molding procedures (shown in Fig. 6 a and Fig. 6 b).
(2) it is applied to after being well mixed scattering powder and ultraviolet glue on the rear surface of microlens array (Fig. 7).
(3) ultraviolet light microlens array is used, by micro lens light beam irradiated region on surface after microlens array
The epoxy glue in domain is formed by curing fringe area；The method of ultraviolet light microlens array is small-bore directional light scan mode (figure
Or big angle of visual field simulated projections machine working method (Fig. 9 and Figure 10) 8)；Microlens array and ultraviolet glue-line such as Figure 11 after exposure.
(4) uncured epoxy glue is washed away (Figure 12) after step (3) curing process, consolidation zone forms fringe area
121, then in the mixed uniformly carbon dust of uncured region coating and resin solution, dry rear flour-carbon resin overlay area and formed and inhaled
Light area 122 (Figure 13).
Operation principle of the present invention is as follows：
State diagram of the light irradiation that projecting apparatus 20 is sent on projection screen 10 is as shown in Figure 2：
Projecting apparatus outgoing beam a is radiated on microlens array, by being projected after micro lens and the lenticule pair
On the fringe area 121 answered, the light scattering from projecting apparatus is returned to be formed scattering light b by fringe area.
The state diagram that surrounding environment light is radiated on projection screen 10 is as shown in Figure 3：Ambient light c is converged to by lenticule
Corresponding to the lenticule in extinction area 122, fully absorbed by extinction area, scattering light b will not be produced.
State of the light that projecting apparatus 20 is sent on projection screen 10 at diverse location is as shown in Fig. 4 and Fig. 5 a~Fig. 5 b：
The angle that screen diverse location receives the light from projecting apparatus is different, as shown in figure 4, projecting apparatus outgoing beam
A is radiated at the light path on the lenticule at the diverse location of projection screen 10 as shown in figure 5, at screen centre position, fringe area
121 at the optical axis of corresponding lenticule 111, and projecting apparatus outgoing beam a is horizontally entered into lenticule, by being converged after micro lens
To gather on the fringe area at optical axis, be all scattered back by fringe area to form scattering light b, ambient light is all absorbed by light-absorption layer,
Scattering light will not be formed；Deviateing at screen centre position and at screen edge locations, projecting apparatus outgoing beam a is at a certain angle
Into in lenticule, by converging to corresponding fringe area after micro lens, all it is scattered back by fringe area Lai and ambient light is then
All absorbed by extinction area.
The specific implementation case of patent of the present invention is the foregoing is only, but the technical characteristic of patent of the present invention is not limited to
This, any those skilled in the relevant art in the field of the invention, all cover in the special of the present invention by the change or modification made
Among sharp scope.
Claims (8)
1. a kind of projection screen for increasing contrast and brightness, including transmission layer and the scattering layer on surface after transmission layer,
Characterized in that, the transmission layer is microlens array, it is distributed with and some is dissipated correspondingly with lenticule on the scattering layer
Area is penetrated, is extinction area between adjacent fringe area；The distribution of fringe area is as follows：
, as the origin of coordinates (0,0), to be scattered at projected light vertical incidence in plane where projection screen corresponding to each lenticule
The coordinate of district center position is (δx, δy), wherein,
<mrow>
<msub>
<mi>&delta;</mi>
<mi>x</mi>
</msub>
<mo>=</mo>
<mrow>
<mo>(</mo>
<mfrac>
<mi>X</mi>
<mi>L</mi>
</mfrac>
<mo>)</mo>
</mrow>
<mo>&times;</mo>
<mi>f</mi>
<mo>,</mo>
</mrow>
<mrow>
<msub>
<mi>&delta;</mi>
<mi>y</mi>
</msub>
<mo>=</mo>
<mrow>
<mo>(</mo>
<mfrac>
<mi>Y</mi>
<mi>L</mi>
</mfrac>
<mo>)</mo>
</mrow>
<mo>&times;</mo>
<mi>f</mi>
</mrow>
X, Y are position coordinates of the corresponding lenticule in screen；
L is vertical range of the projection screen apart from projecting apparatus；
F is the focal length of lenticule.
2. increase the projection screen of contrast and brightness according to claim 1, it is characterised in that lens in microlens array
The ratio range in radius R and lens cycle be 0.55~2.5.
3. increase the projection screen of contrast and brightness according to claim 2, it is characterised in that the lens of microlens array
Cycle is 0.2mm~1mm.
4. increase the projection screen of contrast and brightness according to claim 1, it is characterised in that on the scattering layer with it is micro-
It is each in lens array that the area of fringe area accounts for 1/6~1/2 in scattering layer region corresponding to lenticule.
5. a kind of preparation method for the projection screen for increasing contrast and brightness, it is characterised in that comprise the following steps：
(1) microlens array is prepared using mould pressing method；
(2) it is applied to after being well mixed scattering powder and ultraviolet glue on the rear surface of microlens array；
(3) ultraviolet source irradiation microlens array is used, by micro lens beam irradiation area on surface after microlens array
Epoxy glue be formed by curing fringe area；
The distribution of fringe area is set as follows：
, as the origin of coordinates (0,0), to be scattered at projected light vertical incidence in plane where projection screen corresponding to each lenticule
The coordinate of district center position is (δx, δy), wherein,
<mrow>
<msub>
<mi>&delta;</mi>
<mi>x</mi>
</msub>
<mo>=</mo>
<mrow>
<mo>(</mo>
<mfrac>
<mi>X</mi>
<mi>L</mi>
</mfrac>
<mo>)</mo>
</mrow>
<mo>&times;</mo>
<mi>f</mi>
<mo>,</mo>
</mrow>
<mrow>
<msub>
<mi>&delta;</mi>
<mi>y</mi>
</msub>
<mo>=</mo>
<mrow>
<mo>(</mo>
<mfrac>
<mi>Y</mi>
<mi>L</mi>
</mfrac>
<mo>)</mo>
</mrow>
<mo>&times;</mo>
<mi>f</mi>
</mrow>
X, Y are position coordinates of the corresponding lenticule in screen；
L is vertical range of the projection screen apart from projecting apparatus；
F is the focal length of lenticule；
(4) uncured epoxy glue is washed away after step (3) curing process, be then well mixed in uncured region coating
Resin solution and carbon dust, dry to form extinction area.
6. preparation method according to claim 5, it is characterised in that ultraviolet source irradiation microlens array in step (3)
Method is small-bore directional light scan mode.
7. preparation method according to claim 5, it is characterised in that ultraviolet source irradiation microlens array in step (3)
Method is big angle of visual field simulated projections machine working method.
8. a kind of increase contrast that preparation method as described in claim 5~7 any claim is prepared and brightness
Projection screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610463152.4A CN106154730B (en) | 2016-08-11 | 2016-08-11 | A kind of projection screen for increasing contrast and brightness and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610463152.4A CN106154730B (en) | 2016-08-11 | 2016-08-11 | A kind of projection screen for increasing contrast and brightness and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN106154730A CN106154730A (en) | 2016-11-23 |
| CN106154730B true CN106154730B (en) | 2018-02-02 |
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| CN201610463152.4A Active CN106154730B (en) | 2016-08-11 | 2016-08-11 | A kind of projection screen for increasing contrast and brightness and preparation method thereof |
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Families Citing this family (3)
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|---|---|---|---|---|
| CN110865509B (en) * | 2018-08-27 | 2022-01-04 | 深圳光峰科技股份有限公司 | Projection screen and manufacturing method thereof |
| CN111077722B (en) | 2018-10-18 | 2022-03-25 | 深圳光峰科技股份有限公司 | Projection screen and processing method thereof |
| CN111273512A (en) * | 2018-12-04 | 2020-06-12 | 深圳光峰科技股份有限公司 | Projection screen and projection system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006154768A (en) * | 2004-11-04 | 2006-06-15 | Seiko Epson Corp | Member with concave portion, method of manufacturing member with convex portion, member with convex portion, transmission screen, and rear projector |
| JP2006330631A (en) * | 2005-05-30 | 2006-12-07 | Miraial Kk | Rear-projection type screen |
| CN101770043A (en) * | 2008-12-26 | 2010-07-07 | 财团法人工业技术研究院 | Lens unit and projection screen manufactured by using lens unit |
| CN102012617A (en) * | 2009-09-04 | 2011-04-13 | 陈波 | Forward projection screen capable of shielding ambient light and production method thereof |
| TWI385467B (en) * | 2011-03-08 | 2013-02-11 | Martin Chien | Optical projection screen |
| TWI494681B (en) * | 2014-06-16 | 2015-08-01 | Coretronic Corp | Projection screen and manufacturing method of projection screen |
-
2016
- 2016-08-11 CN CN201610463152.4A patent/CN106154730B/en active Active
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Effective date of registration: 20231123 Address after: Room 1210, 12th Floor, Yifu Science and Technology Building, East District, China University of Metrology, No. 258, Xueyuan Street, Qiantang New District, Hangzhou, Zhejiang, 310018 Patentee after: Hangzhou Xingye Optical Technology Co.,Ltd. Address before: Room 202, 2nd Floor, Standard Factory Building, No. 5 Zhongce Park, No. 1 8th Street, Hangzhou Economic and Technological Development Zone, Zhejiang Province, 310018 Patentee before: HANGZHOU CHANGSONG OPTICS CO.,LTD. |
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