CN107065416A - Structure is fixedly mounted in projection screen - Google Patents
Structure is fixedly mounted in projection screen Download PDFInfo
- Publication number
- CN107065416A CN107065416A CN201710379193.XA CN201710379193A CN107065416A CN 107065416 A CN107065416 A CN 107065416A CN 201710379193 A CN201710379193 A CN 201710379193A CN 107065416 A CN107065416 A CN 107065416A
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- CN
- China
- Prior art keywords
- projection screen
- fixedly mounted
- entablature
- fixed seat
- protective layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
The present invention proposes that structure is fixedly mounted in a kind of projection screen.Structure, which is fixedly mounted, in the projection screen includes non-rigid protective layer, fixed seat, entablature, more than one middle beam and at least one vertical beam, and non-rigid protective layer is located at the back side of projection screen；Fixed seat is fixed on face to be installed；Entablature is removably installed in fixed seat, and entablature is Nian Jie with non-rigid protective layer；Multiple middle beams are Nian Jie with non-rigid protective layer；At least one vertical beam is staggered with multiple middle beams, and vertical beam is fixedly connected with entablature.Structure is fixedly mounted using the projection screen, weight and whole packaging volume can be reduced, and the bad phenomenons such as raised and depression can be avoided the occurrence of, it is ensured that viewing effect.
Description
Technical field
Structure is fixedly mounted the present invention relates to projection screen technical field, more particularly to a kind of projection screen.
Background technology
With the development of optical projection technology, the application field of optical projection technology is constantly extended, and laser-projector etc. is thrown
Shadow equipment has been widely used, and projection screen is the essential part of projector equipment.At present, the throwing commercially used
Shadow screen is broadly divided into hard curtain and supporting part.Hard curtain has Fresnel lens structure because of inside, and the ability of its environment resistant light is strong, and firmly
The rigidity of curtain preferably, has certain non-deformability, is hardly damaged, thus is increasingly widely applied.But, projection
Screen needs to use rational fixed form when in use, to meet the requirement of projection products.
In the prior art, the installation of hard curtain is mainly glued itself and rigid back using stickums such as double faced adhesive tape or glue
It is connected together, realizes the fixation to mask, surrounding reassembles the decorations such as upper side frame, just constitutes a finished product screen.Rigid back
Plate is mainly using honeycomb aluminum plate, aluminium-plastic panel or steel plate etc., and still, rigid back area is big, weight weight, is difficult to carry, and once
It is fixed on after mounting surface, it is difficult to dismantle.
Therefore, it is necessary to which studying a kind of projection screen is fixedly mounted structure.
Above- mentioned information disclosed in the background section is only used for strengthening the understanding of the background to the present invention, therefore it can
With including not constituted the information to prior art known to persons of ordinary skill in the art.
The content of the invention
It is an object of the invention to overcome a kind of not enough fixed there is provided projection screen of at least one of above-mentioned prior art to pacify
Assembling structure.
For achieving the above object, the present invention is adopted the following technical scheme that：
According to an aspect of the invention, there is provided structure is fixedly mounted in a kind of projection screen, the projection screen fixes peace
Assembling structure includes non-rigid protective layer, fixed seat, entablature, more than one middle beam and at least one vertical beam, non-rigid
Protective layer is located at the back side of projection screen；Fixed seat is fixed on face to be installed；Entablature is removably installed in the fixation
On seat, the entablature is Nian Jie with the non-rigid protective layer；Multiple middle beams are Nian Jie with the non-rigid protective layer；At least
One vertical beam is staggered with the multiple middle beam, and the vertical beam is fixedly connected with the entablature.
According to an embodiment of the present invention, the projection screen be fixedly mounted structure also include strengthening fixed seat and under
Crossbeam；Strengthen fixed seat to be fixed on face to be installed；Sill is removably connected with the reinforcement fixed seat, the sill
It is be arranged in parallel with the entablature, the sill is Nian Jie with the non-rigid protective layer.
According to an embodiment of the present invention, the projection screen is fixedly mounted structure and also includes strengthening fixture and add
Strong ties part；Strengthen fixture in the reinforcement fixed seat；Strengthen connector on the sill, it is described to strengthen connecting
Fitting is connected with the reinforcement fixture by adhesive or bonding mode.
According to an embodiment of the present invention, the reinforcement fixture is the circle hair side of the first magnet or magic tape, described
Strengthen the second magnet or magic tape that connector is set to circle hair side corresponding matching with first magnet or the magic tape
Seta face.
According to an embodiment of the present invention, be provided with groove in the fixed seat, the entablature be provided with it is described
The hook that groove coordinates.
According to an embodiment of the present invention, the vertical beam is pasted on the middle beam.
According to an embodiment of the present invention, the middle beam is provided with the through hole run through for the vertical beam, described perpendicular
Beam is connected through the through hole with the middle beam.
According to an embodiment of the present invention, it is spaced in 10mm between the entablature and multiple middle beams
To between 600mm；The vertical beam is multiple, and 10mm is spaced between 2200mm between multiple vertical beams.
According to an embodiment of the present invention, structure, which is fixedly mounted, in the projection screen also includes frame, and frame is coated on
The projection screen periphery is simultaneously fixedly connected with the projection screen.
According to an embodiment of the present invention, the non-rigid protective layer is one side foam rubber, poly terephthalic acid second two
One or more in alcohol ester diaphragm, skin of paint and ink for screen printing layer.
As shown from the above technical solution, the present invention possesses at least one of advantages below and good effect：
Structure is fixedly mounted in projection screen of the present invention, and non-rigid diaphragm is provided with the back side of projection screen, non-rigid
Diaphragm can protect the reflecting coating at the projection screen back side, prevent reflecting coating to be scratched, and prevent spectators from front through throwing
Shadow screen sees the object contributions viewing effect at the back side, and can make up the change in size that projection screen dilation is brought；
It can further avoid fixing the rigid back of monoblock at the projection screen back side, advantageously reduce weight and whole packaging volume.
Projection screen is supported and fixed from the back side of projection screen by entablature and vertical beam staggeredly and middle beam, from
And can make projection screen that there is good flatness, it is to avoid there are the bad phenomenons such as raised and depression, it is ensured that viewing effect.Due to
Entablature, middle beam and vertical beam are fixed with projection screen by bonding mode, are conducive to simplifying structure, are easy to assembling；
In addition, entablature is detachably connected with fixed seat, so as to dismantle projection screen in the case where not dismantling fixed seat, make behaviour
Make simple.
Brief description of the drawings
Its example embodiment is described in detail by referring to accompanying drawing, above and other feature of the invention and advantage will become
It is more obvious.
Fig. 1 is the structural representation that the embodiment of structure one is fixedly mounted in projection screen of the present invention；
Fig. 2 is the structural representation that another embodiment of structure is fixedly mounted in projection screen of the present invention；
Fig. 3 is the structural representation that structure a further embodiment is fixedly mounted in projection screen of the present invention；
Fig. 4 is the mounting structure schematic diagram of entablature and sill；
Fig. 5 is the mounting structure schematic diagram of entablature, sill and middle beam；
Fig. 6 is the structural representation that entablature or middle beam are connected with projection screen；
Fig. 7 is the structural representation that middle beam is connected with vertical beam；
Fig. 8 is the configuration schematic diagram strengthened fixture and strengthen connector；
Fig. 9 is the mounting structure schematic diagram of frame；
Main element description of reference numerals is as follows in figure：1st, projection screen；2nd, non-rigid protective layer；3rd, entablature；4th, under
Crossbeam；5th, middle beam；6th, vertical beam；7th, frame；8th, frame adhesive linkage；9th, two-sided foam rubber；10th, fixed seat is strengthened；11st, strengthen
Fixture；12nd, connector is strengthened.
Embodiment
Example embodiment is described more fully with referring now to accompanying drawing.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that the present invention will
Fully and completely, and by the design of example embodiment those skilled in the art is comprehensively conveyed to.Identical accompanying drawing in figure
Mark represents same or similar structure, thus will omit their detailed description.
Structure is fixedly mounted in projection screen of the present invention, for projection screen to be installed into face to be installed.The institute of reference picture 1
Show, structure, which is fixedly mounted, in the projection screen can include non-rigid protective layer 2, fixed seat, entablature 3, more than one middle part horizontal stroke
Beam 5 and at least one vertical beam 6.Non-rigid protective layer 2 is located at the back side of projection screen 1, and fixed seat is fixed on face to be installed；On
Crossbeam 3, more than one middle beam 5 and at least one vertical beam 6 may be constructed an installation frame, projection screen 1 and non-
Rigid course 2 can be fixed on the installation frame, and the installation frame is removably installed in fixed seat, so that will projection
Screen 1 and non-rigid protective layer 2 are removably installed in fixed seat.
In this example embodiment, the back side of projection screen 1 is the one side that projection screen 1 is installed, projection screen 1
Front is the one side that spectators watch that allows of projection screen 1.
In this example embodiment, fixed seat could be arranged to it is multiple, it can also be provided that one of strip.It is fixed
Groove can be provided with seat, groove can be arranged on the upper top surface of fixed seat.It can be provided with and coordinate with groove on entablature 3
Hook, link up with general downward bending.Groove, which will be linked into, can realize the detachable installation of entablature 3 and fixed seat.When
So, it will be appreciated by persons skilled in the art that the hook of upward bending can also be set in fixed seat, on entablature 3
Downward groove is set.
In this example embodiment, as shown in figure 4, entablature 3 can be bonded in the top position of non-rigid protective layer 2
Put, sill 4 can be bonded in the bottom position of non-rigid protective layer 2, the length of entablature 3 and sill 4 can be with throwing
The height of the same length of shadow screen 1, entablature 3 and sill 4 is essentially identical, passes through entablature 3 and sill 4
Projection screen 1 can be done simple fixation.As shown in figure 5, can be provided with five middle beams 5 is uniformly arranged on entablature
Between 3 and sill 4, the distance between two neighboring middle beam 5 be about 170mm, and five middle beams 5 with it is described non-
Rigid course 2 is bonded.As shown in fig. 6, the back side of projection screen 1 is pasted with non-rigid protective layer 2, middle beam 5 or upper horizontal stroke
Can be bonded by two-sided foam rubber 9 between beam 3 and non-rigid protective layer 2.The length of five middle beams 5 and projection screen 1
Length it is also essentially identical, the height of the height of five middle beams 5 less than entablature 3 and sill 4.Due to needing upper
Groove or hook for installation is installed on crossbeam 3, be provided with sill 4 reinforcement connector 12, so by entablature 3 with
And sill 4 is arranged to different sizes from middle beam 5, the size of middle beam 5 is reduced, so as to reduce whole mounting structure
Weight.Middle beam 5 has certain rigidity and intensity, and main function is after the suspension of projection screen 1 is good, can to make projection
The surface of screen 1 keeps good flatness, and projection screen 1 is not in the bad phenomenons such as waveform, convex, spill, Bu Huiying
Ring the image quality projected.In addition, in other example embodiments of the present invention, sill 4, middle part can be not provided with
The number of crossbeam 5 can determine that the spacing between entablature 3 and multiple middle beams 5 can be in 10mm as needed
Selected suitably between 600mm.
In this example embodiment, as shown in figure 1, vertical beam 6 can be connected between entablature 3 and sill 4,
The upper and lower ends of vertical beam 6 can be corresponded to and are fixed on entablature 3 and sill 4, and vertical beam 6 could be arranged to one.As Fig. 2 with
And shown in Fig. 3, the 1600mm that is spaced about between two vertical beams 6, two vertical beams 6 can also be provided with, and two vertical beams 6 can
To be symmetrical set between entablature 3 and sill 4.The two ends of vertical beam 6 can be fixed by screws in entablature 3 with
And on sill 4, vertical beam 6 is staggered with middle beam 5, and can be by viscous in the position that vertical beam 6 intersects with middle beam 5
The mode of connecing connects vertical beam 6 and middle beam 5.As shown in fig. 7, can also be set on middle beam 5 for leading to that the vertical beam 6 runs through
Hole, vertical beam 6 is connected through the through hole with the middle beam 5.The rigidity and stably of whole screen can be strengthened by vertical beam 6
Property, prevents that waveform from occurring in mask, convex, the bad phenomenon such as spill.Bubble face glue-line can also be set at the back side of vertical beam 6, used
In filling up the gap between vertical beam 6 and face to be installed.In addition, in other example embodiments of the present invention, the number of vertical beam 6
It can determine as needed, the spacing between multiple vertical beams 6 can be selected suitably in 10mm between 2200mm.Vertical beam 6
Two ends can also be fixed on by rivet on entablature 3 and sill 4.
Further, as shown in figure 8, structure, which is fixedly mounted, in the projection screen can also include reinforcement fixed seat 10, reinforcement
Fixture 11 and reinforcement connector 12；Strengthen fixed seat 10 to be fixed on face to be installed, strengthen fixture 11 solid located at strengthening
In reservation 10, strengthen connector 12 on sill 4；Strengthen connector 12 and pass through adhesive or bonding side with strengthening fixture 11
Formula fixes projection screen 1.Fixed seat coordinates with entablature 3, causes the bottom of projection screen 1 to be in free state, projection screen 1
Easily started.Set on sill 4 and strengthen connector 12, strengthened connector 12 and the reinforcement being fixed on face to be installed is consolidated
Determine part 11 and coordinate further to fix screen hanging frame.Specifically, the structure for strengthening fixed seat 10 is cuboid frame-shaped construction, its
Simultaneously it is fixed on by screw or other forms on face to be installed, its another side is fixed with the first magnet as reinforcement fixture
11, groove can also be set to be used to accommodate the first magnet on fixed seat 10 is strengthened；Set and the first magnet phase on sill 4
Second magnet of mutual adhesive directly sets an iron block or iron plate as reinforcement connector 12, you can reach the purpose of adhesive, from
And the bottom of projection screen 1 is fixed, can also be set on sill 4 groove be used for accommodate the second magnet.Certainly,
It can set the circle hair side of magic tape as fixture 11 is strengthened on fixed seat 10 is strengthened, strengthen connector 12 and be set to and glue
The seta face for the magic tape that the circle hair side of cingulum coordinates；Foam double-faced adhesive band connection reinforcement fixed seat 10 and projection can also be passed through
The bottom of screen 1.Strengthen fixture 11 and strengthen the bottom that connector 12 is not necessarily mounted at projection screen 1, as needed
The periphery of projection screen 1 can also be arranged on.
Further, as shown in figure 9, the projection screen is fixedly mounted, structure can also include frame 7 and frame is bonded
Layer 8；Frame 7 is located at the front of projection screen 1, and located at the periphery of projection screen 1；Frame adhesive linkage 8 is used to be bonded frame 7 and throwing
Shadow screen 1.In this example embodiment, the frame 7 is set to the frame consistent with the size and shape of projection screen 1
Shape, the frame 7 can include the frame shape platen surface fitted with the front of projection screen 1, the outer circumferential projection of frame shape platen surface
The side bending of screen 1 forms frame shape folding surface, and frame shape folding surface can be by projection screen 1, non-rigid protective layer 2 and crossbeam
Part or all of cladding, makes the profile of whole projection screen 1 after installation complete attractive in appearance and can reach guarantor to projection screen 1
The effect of shield.
The non-rigid protective layer 2 is one side foam rubber, polyethylene terephthalate film piece, skin of paint and silk-screen
One or more in ink layer.In this example embodiment, selection one side foam rubber is used as non-rigid protective layer 2, projection
Screen 1 be optics mask, projection screen 1 temperature raise and reduce when its can dilation, shrinkage factor be 3/1000ths, and
With light-transmissive；The also more fragile easy scuffing of the back side reflector layer of projection screen 1.In order to prevent projection screen 1 itself
Characteristic reduces the experience of user, it is therefore desirable to protect the back side reflecting coating of projection screen 1 to prevent it from scratching, prevent from front transmission
Projection screen 1 sees the object at the back side and influences viewing effect and make up the change in size that the dilation of projection screen 1 is brought.
In this example embodiment, the adhesive linkage of crossbeam and non-rigid protective layer 2, crossbeam in vertical beam 6 adhesive linkage with
And frame adhesive linkage 8 can use two-sided foam rubber 9, two-sided foam rubber 9 has certain elasticity, when the heat expansion of projection screen 1
During shrinkage, gentle solution can be made up and expanded with heat and contract with cold the change in size brought, so as to ensure that projection screen 1 is not likely to produce distortion, shifting
Position, bending etc., it is to avoid the quality of influence projection image quality, also help simplified structure, are easy to assembling.
Projection screen 1 and fixed installation structure are done into split-type design, convenient transport.I.e.：Reach and pacify in projection screen 1
Before filling place, each part be it is independent, compartment, do not set up connection between each part, projection screen 1,
Non-rigid protective layer 2, vertical beam 6, crossbeam, entablature 3, fixation double faced adhesive tape, sill 4 and magnet etc. are all zero of separation
Part, the parts of these separation share a packing case.After the packing case of projection screen 1 enters fabricating yard, installer
Fu takes packing case apart, takes out each parts, carries out the assembling of screen, and assembling is mounted again after finishing.
Above-mentioned described feature, structure or characteristic can be combined in one or more embodiment party in any suitable manner
It is characterized in interchangeable discussed in each example embodiment if possible in formula.There is provided many in superincumbent description
Detail fully understands so as to provide to embodiments of the present invention.It will be appreciated, however, by one skilled in the art that can be with
Technical scheme is put into practice without one or more in the specific detail, or can using other methods,
Component, material etc..In other cases, it is not shown in detail or describes known features, material or operates to avoid obscuring this hair
Bright each side.
Term " about " " about " is used to be generally represented within the 20% of a set-point or scope in this specification, preferably
It is within 10%, and is more preferably within 5%.Given quantity is quantity about herein, is implied that in the feelings without certain illustrated
Under condition, the implication of " about " " about " " substantially " " general " can be still implied.
Although use the term of relativity in this specification, such as " on " " under " describes a component of icon for another
The relativeness of one component, but these terms are used in this specification merely for convenient, for example with reference to the accompanying drawings described in show
The direction of example.Be appreciated that, if making it turn upside down the upset of the device of icon, describe " on " component will
As " under " component.The term of other relativities, also makees have similar meaning such as " just " " back of the body " " top " " bottom ".When certain
Structure other structures " on " when, it is possible to refer to that certain structural integrity is formed in other structures, or refer to certain structure " direct " to set
Put in other structures, or refer to certain structure and be arranged on by another structure " indirect " in other structures.
In this specification, term " one ", " one ", "the", " described " and " at least one " to represent to exist one or
Multiple key element/parts/etc.；Term "comprising", " comprising " and " having " are to represent the open meaning being included
And refer to the key element except listing/part/also may be present in addition to waiting other key element/part/etc.；Term " the
One " and " second " etc. are only used as mark, are not the quantity limitations to its object.
It should be appreciated that the present invention is not limited in its application to the detailed construction and arrangement of the part of this specification proposition
Mode.The present invention can have other embodiment, and can realize and perform in many ways.Aforesaid deformation form and
Modification is fallen within the scope of the present invention.It should be appreciated that this disclosure and the present invention limited are extended in text
And/or mentioned in accompanying drawing or significantly all alternative combinations of two or more independent features.It is all these different
Combination constitutes multiple alternative aspects of the present invention.Embodiment described in this specification illustrates to become known for realizing the present invention
Best mode, and will enable those skilled in the art using the present invention.
Claims (10)
1. structure is fixedly mounted in a kind of projection screen, it is characterised in that including：
Non-rigid protective layer, located at the back side of projection screen；
Fixed seat, is fixed on face to be installed；
Entablature, is removably installed in the fixed seat, and the entablature is Nian Jie with the non-rigid protective layer；
More than one middle beam, it is Nian Jie with the non-rigid protective layer；
At least one vertical beam, is staggered with the multiple middle beam, and the vertical beam is fixedly connected with the entablature.
2. structure is fixedly mounted in projection screen according to claim 1, it is characterised in that the projection screen is fixedly mounted
Structure also includes：
Strengthen fixed seat, be fixed on face to be installed；
Sill, removably with it is described reinforcement fixed seat be connected, the sill be arranged in parallel with the entablature, it is described under
Crossbeam is Nian Jie with the non-rigid protective layer.
3. structure is fixedly mounted in projection screen according to claim 2, it is characterised in that the projection screen is fixedly mounted
Structure also includes：
Strengthen fixture, in the reinforcement fixed seat；
Strengthen connector, on the sill, the reinforcement connector passes through adhesive or bonding with the reinforcement fixture
Mode is connected.
4. structure is fixedly mounted in projection screen according to claim 3, it is characterised in that the reinforcement fixture is first
The circle hair side of magnet or magic tape, the reinforcement connector is set to corresponding with the circle hair side of first magnet or the magic tape
The second magnet coordinated or the seta face of magic tape.
5. structure is fixedly mounted in projection screen according to claim 1, it is characterised in that be provided with ditch in the fixed seat
Groove, the entablature is provided with the hook coordinated with the groove.
6. structure is fixedly mounted in projection screen according to claim 1, it is characterised in that the vertical beam be pasted on it is described in
On portion's crossbeam.
7. structure is fixedly mounted in projection screen according to claim 1, it is characterised in that the middle beam is provided with confession
The through hole that the vertical beam runs through, the vertical beam is connected through the through hole with the middle beam.
8. structure is fixedly mounted in projection screen according to claim 1, it is characterised in that
10mm is spaced between 600mm between the entablature and multiple middle beams；
The vertical beam is multiple, and 10mm is spaced between 2200mm between multiple vertical beams.
9. structure is fixedly mounted in projection screen according to claim 1, it is characterised in that the projection screen is fixedly mounted
Structure also includes：
Frame, is coated on the projection screen periphery and is fixedly connected with the projection screen.
10. structure is fixedly mounted in projection screen according to claim 1, it is characterised in that the non-rigid protective layer is
One or more in one side foam rubber, polyethylene terephthalate film piece, skin of paint and ink for screen printing layer,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710379193.XA CN107065416A (en) | 2017-05-25 | 2017-05-25 | Structure is fixedly mounted in projection screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710379193.XA CN107065416A (en) | 2017-05-25 | 2017-05-25 | Structure is fixedly mounted in projection screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107065416A true CN107065416A (en) | 2017-08-18 |
Family
ID=59609793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710379193.XA Pending CN107065416A (en) | 2017-05-25 | 2017-05-25 | Structure is fixedly mounted in projection screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107065416A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203535372U (en) * | 2013-10-31 | 2014-04-09 | 海信集团有限公司 | Screen fixing rack and projection screen |
| CN206162050U (en) * | 2016-11-18 | 2017-05-10 | 四川长虹电器股份有限公司 | Optics screen curtain structure |
-
2017
- 2017-05-25 CN CN201710379193.XA patent/CN107065416A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203535372U (en) * | 2013-10-31 | 2014-04-09 | 海信集团有限公司 | Screen fixing rack and projection screen |
| CN206162050U (en) * | 2016-11-18 | 2017-05-10 | 四川长虹电器股份有限公司 | Optics screen curtain structure |
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Application publication date: 20170818 |