CN111781794B - Adjustable holographic projection screen for holographic projection technology - Google Patents
Adjustable holographic projection screen for holographic projection technology Download PDFInfo
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- CN111781794B CN111781794B CN202010719971.7A CN202010719971A CN111781794B CN 111781794 B CN111781794 B CN 111781794B CN 202010719971 A CN202010719971 A CN 202010719971A CN 111781794 B CN111781794 B CN 111781794B
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- projection screen
- flexible
- seat
- fixedly connected
- holographic projection
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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
- G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
Abstract
The invention relates to the technical field of holographic projection equipment, and discloses an adjustable holographic projection screen for holographic projection technology, which comprises an upper keel frame, wherein a power box is fixedly installed at the top of the upper keel frame, a rope collecting roller is movably installed on the front surface of the power box, a connecting seat is fixedly installed on the side surface of the upper keel frame, a projection screen frame body is movably connected to the side surface of the connecting seat, a flexible zipper matched with the rope collecting roller is fixedly connected to the side surface of the projection screen frame body, and the number of the projection screen frame bodies is three. Through the cooperation that sets up receipts rope roller, flexible zip fastener, connecting seat chaining tooth for the device not only can adjust the angle of projection curtain, and then at the in-process of stage performance, can adjust projected effect according to the projection scene of difference, can take flexible projection curtain to pack up in step with the projection curtain support body when not using moreover, and then avoids occuping the stage position when not using.
Description
Technical Field
The invention relates to the technical field of holographic projection equipment, in particular to an adjustable holographic projection screen for holographic projection technology.
Background
The holographic projection technology belongs to a 3D technology, originally refers to a technology for recording and reproducing a real three-dimensional image of an object by utilizing an interference principle, and then along with the guidance of science fiction movies and commercial propaganda, the concept of holographic projection gradually extends to commercial activities such as stage performance, exhibition and exhibition, but the holography which is learned at ordinary times is not the holographic projection in a strict sense, but is a holographic projection technology similar to the 3D effect realized by using methods such as Peltier phantom, edge blanking and the like.
In-process carrying out holographic projection and using, need use the holographic projection curtain, present holographic projection curtain is when on the stage, the projection curtain is transversely during the play curtain, the projection curtain is more loose, cause the problem that the projection overlaps easily, it fixes to the bottom of projecting die to need people again, when the image of projection difference, still need the angle of manual regulation holographic projection curtain, and then realize that holographic projection image position adjusts, and the surface of projection curtain can adhere a large amount of dust through long-time the use, make the projector image can't see through, thereby cause the problem that projection shortage or projection are fuzzy.
Disclosure of Invention
The invention provides an adjustable holographic projection screen for holographic projection technology, which has the advantages that the angle of the holographic projection screen can be adjusted, the projection effect can be further adjusted, the field arrangement can be realized without transporting the holographic projection screen, several projection screens can be synchronously arranged, the surface of the projection screen can be ensured to be clean, the projection screen can be ensured not to be blown by wind, and the problems in the background technology are solved.
The invention provides the following technical scheme: the utility model provides a holographic projection curtain with adjustable holographic projection technique is with, includes upper portion keel frame, the top fixed mounting of upper portion keel frame has the headstock, the positive movable mounting of headstock has receipts rope roller, the side fixed mounting of upper portion keel frame has the connecting seat, the side swing joint of connecting seat has the projection curtain support body, the side fixedly connected with of projection curtain support body and receipts rope roller matched with flexible zip fastener, the quantity of projection curtain support body is three, and is three the projection curtain support body is the rectangular frame.
Preferably, a movable cavity is formed in the side surface of the inner cavity of the projection screen frame body, a trapezoidal cavity is formed in the side surface, located in the movable cavity, of the inner cavity of the projection screen frame body, a tension spring is fixedly connected to the bottom of the inner cavity of the movable cavity, a flexible clamping plate device is fixedly connected to the top of the tension spring, a connecting negative pressure seat is fixedly mounted on the side surface of the inner cavity of the movable cavity, a negative pressure generating cylinder communicated with the connecting negative pressure seat is fixedly mounted on the front surface of the connecting negative pressure seat, a clamping seat matched with the negative pressure generating cylinder is fixedly connected to the side surface of the flexible clamping plate device, a flexible pull film is fixedly communicated with the side surface of the connecting negative pressure seat, a track seat matched with the flexible clamping plate device is fixedly connected to the side surface of the flexible pull film, a speed reducing motor is fixedly mounted on the outer side of the top of the projection screen frame body, the, the outer surface of the curtain collecting roller is movably connected with a flexible projection curtain.
Preferably, the side fixedly connected with buckle device of flexible splint device, the medial surface fixedly connected with inserted bar device of flexible splint device, the inboard of flexible splint device and the side activity joint of flexible projection curtain, the trompil with inserted bar device matched with is seted up to the side of flexible projection curtain.
Preferably, the side fixedly connected with spring of projection screen support body, the other end fixedly connected with movable roller of spring, the quantity of movable roller is two, two the movable roller is located the both sides of flexible projection screen respectively, two the external fixed surface of movable roller bonds and has the adhesion plate.
Preferably, the top fixed mounting of connecting seat has the support frame, the side movable mounting of support frame has the chain tooth with flexible zip fastener matched with, the first belt pulley of input fixedly connected with of chain tooth, the inside movable mounting of connecting seat has the second belt pulley, first belt pulley passes through the belt and is connected with the transmission of second belt pulley, the side fixedly connected with lead screw of second belt pulley, the front of connecting seat inner chamber is located the below fixed mounting of lead screw has the backup pad, the surface screw thread of lead screw installs the sliding seat, the bottom of sliding seat and the top slip joint of backup pad, the side fixedly connected with elasticity kelly of sliding seat.
Preferably, the outer surface of the curtain collecting roller is provided with an annular groove matched with the flexible clamping plate device.
Preferably, the other end of the elastic clamping rod is provided with an arc-shaped clamping joint.
Preferably, the negative pressure generating cylinder comprises an outer cylinder body, a piston, a pulling rod and a communicating port communicated with the connecting negative pressure seat.
The invention has the following beneficial effects:
1. this holographic projection curtain with adjustable holographic projection technique is used, through setting up the cooperation of receipts rope roller, flexible zip fastener, chain tooth on the connecting seat for the device not only can adjust the angle of projection curtain, and then at the in-process of stage performance, can adjust projected effect according to the projection scene of difference, can take flexible projection curtain to pack up in step with the projection curtain support body when not using in addition, and then avoids occuping the stage position when not using.
2. This holographic projection screen with adjustable holographic projection technique is used, through the setting of receiving curtain roller, flexible projection screen, extension spring, can be when the projection screen does not use, can pack up flexible projection screen, and then prevent that the surface of flexible projection screen from being damaged, through the setting of activity roller and spring, can carry out the adhesion with the dust on its surface when receiving flexible projection screen to prevent that the dust from influencing the projection effect.
3. This holographic projection curtain with adjustable holographic projection technique is used, through setting up joint seat, the cylinder takes place for the negative pressure, connect the negative pressure seat, the cooperation of flexible drawing membrane and track seat, make flexible projection curtain at the decline in-process, make the joint seat drive the negative pressure and take place the negative pressure in the cylinder, thereby make the flexibility draw the membrane down the inside concave yield of connection negative pressure seat under the negative pressure effect, thereby it is taut with flexible projection curtain both sides through the track seat, and then guarantee the level and smooth of flexible projection curtain.
Drawings
FIG. 1 is a front view of the structure of the present invention;
FIG. 2 is a cross-sectional view of a projection screen frame of the present invention;
FIG. 3 is a schematic view of a structure of a negative pressure generating cylinder according to the present invention;
FIG. 4 is a side cross-sectional view of a structural flexible splint device of the present invention;
FIG. 5 is a side view of a curtain roller of the present invention construction;
FIG. 6 is a front view of the structural connector base of the present invention;
FIG. 7 is a side cross-sectional view of a structural joint base of the present invention.
In the figure: 1. an upper keel frame; 2. a rope reeling roller; 3. a power box; 4. a projection screen frame body; 5. a flexible zipper; 6. a connecting seat; 7. a movable cavity; 8. a tension spring; 9. a trapezoidal cavity; 10. a flexible projection screen; 11. a reduction motor; 12. a curtain collecting roller; 13. a flexible splint device; 14. a clamping seat; 15. a buckle device; 16. a rod insertion device; 17. a spring; 18. a movable roller; 19. a support frame; 20. a first pulley; 21. chain teeth; 22. a belt; 23. a second pulley; 24. a screw rod; 25. a support plate; 26. a movable seat; 27. an elastic clamping rod; 28. a negative pressure generating cylinder; 29. a rail seat; 30. connecting a negative pressure seat; 31. and (6) flexibly pulling the film.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The drawings in the embodiments of the invention: the different types of hatching in the figures are not given the national standards, do not require the material of the elements, and distinguish between cross-sectional views of the elements in the figures.
Please refer to fig. 1-7, an adjustable holographic projection screen for holographic projection technology, includes an upper keel frame 1, a power box 3 is fixedly installed on the top of the upper keel frame 1, a worm gear speed reducer is installed inside the power box 3, which can realize the self-locking function of the power box 3, a rope winding roller 2 is movably installed on the front of the power box 3, a connecting seat 6 is fixedly installed on the side of the upper keel frame 1, a projection screen frame body 4 is movably connected to the side of the connecting seat 6, a flexible zipper 5 matched with the rope winding roller 2 is fixedly connected to the side of the projection screen frame body 4, the number of the projection screen frame bodies 4 is three, and the three projection screen frame bodies 4 are rectangular frames.
The side surface of the inner cavity of the projection screen frame body 4 is provided with a movable cavity 7, the inner side of the inner cavity of the projection screen frame body 4 is positioned on the side surface of the movable cavity 7 and is provided with a trapezoidal cavity 9, the bottom of the inner cavity of the movable cavity 7 is fixedly connected with a tension spring 8, the top of the tension spring 8 is fixedly connected with a flexible clamping plate device 13, the side surface of the inner cavity of the movable cavity 7 is fixedly provided with a connecting negative pressure seat 30, the front surface of the connecting negative pressure seat 30 is fixedly provided with a negative pressure generating cylinder 28 communicated with the connecting negative pressure seat 30, the negative pressure generating cylinder 28 comprises an outer cylinder body, a piston, a pulling rod and a communicating port communicated with the connecting negative pressure seat 30, the side surface of the flexible clamping plate device 13 is fixedly connected with a clamping seat 14 matched with the negative pressure generating cylinder 28, the side surface of the connecting negative pressure seat 30 is fixedly communicated, through the cooperation of the clamping seat 14, the negative pressure generating cylinder 28, the connecting negative pressure seat 30, the flexible pull film 31 and the rail seat 29, the flexible projection screen 10 is made to descend, so that the clamping seat 14 drives the negative pressure generating cylinder 28 to generate negative pressure, the flexible pull film 31 is recessed into the connecting negative pressure seat 30 under the action of the negative pressure, so that two sides of the flexible projection screen 10 are tensioned through the rail seat 29, and the smoothness of the flexible projection screen 10 is further ensured, the outer side of the bottom of the projection screen frame body 4 is fixedly provided with the speed reducing motor 11, the output end of the speed reducing motor 11 extends to the inner side of the projection screen frame body 4 and is fixedly connected with the screen collecting roller 12, the outer surface of the screen collecting roller 12 is provided with an annular groove matched with the flexible clamping plate device 13, the annular groove can pack up the flexible clamping plate device 13, the outer surface of the screen collecting roller 12 is movably connected with the flexible projection screen 10, the side surface of the flexible clamping plate, the inner side surface of the flexible clamping plate device 13 is fixedly connected with an inserted rod device 16, the inner side of the flexible clamping plate device 13 is movably clamped with the side surface of the flexible projection screen 10, the side surface of the flexible projection screen 10 is provided with a hole matched with the inserted rod device 16, the flexible clamping plate device 13 can be arranged for a long time in the use of the projection screen, when the flexible projection screen 10 needs to be replaced, the original flexible projection screen 10 can be removed, then a new flexible projection screen 10 can be replaced by using the inserted rod device 16, the side surface of the projection screen frame body 4 is fixedly connected with a spring 17, the other end of the spring 17 is fixedly connected with two movable rollers 18, the two movable rollers 18 are respectively positioned at the two sides of the flexible projection screen 10, the outer surfaces of the two movable rollers 18 are fixedly bonded with adhesive plates with certain viscosity, and the adhesive plates are movably connected with the screen 12 and the flexible projection screen 10 through, The setting of extension spring 8 can be when the projection screen does not use, can pack up flexible projection screen 10, and then prevents that the surface of flexible projection screen 10 from being damaged, through the setting of activity roller 18 and spring 17, can carry out the adhesion with the dust on its surface when packing up flexible projection screen 10 to prevent that the dust from influencing the projection effect.
The top of the connecting seat 6 is fixedly provided with a supporting frame 19, the side surface of the supporting frame 19 is movably provided with a chain tooth 21 matched with the flexible zipper 5, the input end of the chain tooth 21 is fixedly connected with a first belt pulley 20, the inside of the connecting seat 6 is movably provided with a second belt pulley 23, the first belt pulley 20 is in transmission connection with the second belt pulley 23 through a belt 22, the side surface of the second belt pulley 23 is fixedly connected with a screw rod 24, the front surface of the inner cavity of the connecting seat 6 is positioned below the screw rod 24 and is fixedly provided with a supporting plate 25, the outer surface of the screw rod 24 is provided with a movable seat 26 in a threaded manner, the bottom of the movable seat 26 is in sliding clamping connection with the top of the supporting plate 25, the side surface of the movable seat 26 is fixedly connected with an elastic clamping rod 27, the other end of the elastic clamping rod 27 is provided with an arc-shaped clamping joint, arc joint is the dop that elasticity kelly 27 expansion end is the cambered surface, be a part of elasticity kelly 27, and projection curtain support body 4 is located the inboard of the near-end of connecting seat 6 and has seted up the joint hole with elasticity kelly 27 matched with, can be through setting up receipts rope roller 2, flexible zip fastener 5, the cooperation of chain strip tooth 21 on connecting seat 6, make the device not only can adjust the angle of projection curtain, and then at the in-process of stage performance, can adjust projected effect according to the projection scene of difference, and can take flexible projection curtain 10 to pack up in step with projection curtain support body 4 when not using, and then avoid occuping the stage position when not using.
Working principle, when people arrange the stage, the power box 3 drives the rope-collecting roller 2 to rotate, so that the flexible zipper 5 is in an unlocking state, so that the chain teeth 21 rotate under the driving of the flexible zipper 5, meanwhile, the chain teeth 21 drives the first belt pulley 20 to rotate, so that the belt 22 drives the second belt pulley 23 to rotate, so that the lead screw 24 rotates, meanwhile, due to the unlocking of the flexible zipper 5, the projection screen frame body 4 is subjected to the action of gravity and tends to move downwards, because the lead screw 24 rotates, the movable seat 26 drives the elastic clamping rod 27 to move towards the inner side of the connecting seat 6, so that the projection screen frame body 4 is unlocked, so that the projection screen frame body 4 falls down, meanwhile, the angle of the projection screen frame body 4 is adjusted when the projection screen frame body 4 falls down, and in the using process, the angle of the projection screen frame body 4 can be synchronously adjusted according to different images, meanwhile, the speed reducing motor 11 rotates, the tension spring 8 can pull the flexible projection screen 10 downwards by pulling the flexible clamping plate device 13, at the moment, the flexible clamping plate device 13 can move to the rail seat 29 and move downwards along the rail seat 29, when the flexible projection screen 10 is about to completely cover the trapezoidal cavity 9, the clamping seat 14 is driven by the flexible clamping plate device 13 to act on the plate pulling part of the negative pressure generating cylinder 28, so that negative pressure is generated in the negative pressure generating cylinder 28, and then negative pressure is generated in the negative pressure connecting seat 30, and therefore the flexible pulling film 31 is pulled inwards under the action of the negative pressure connecting seat 30, and then the flexible clamping plate device 13 is pulled through the rail seat 29, so that the flexible projection screen 10 is tensioned, after stage performance is finished, the power box 3 drives the rope collecting roller 2 to rotate reversely, thereby pulling up the projection screen frame body 4, the second belt pulley 23 will also rotate, the lead screw 24 reversely rotates, when the clamping hole of the projection screen frame body 4 moves to be parallel to the connecting seat 6 along with the projection screen frame body 4, the movable seat 26 drives the elastic clamping rod 27 to move to the outside of the connecting seat 6 under the driving of the rotation of the lead screw 24, and the elastic clamping rod 27 extends into the clamping hole at the position of the projection screen frame body 4, thereby realizing the locking of the projection screen frame body 4, if the projection screen frame body 4 needs to be fixed at any angle, only in the moving process of the projection screen frame body 4, the operation of the locking power box 3 is stopped, and further the angle of the projection screen frame body 4 is fixed by utilizing the self-locking of the power box 3, and simultaneously, the speed reduction motor 11 reversely drives the screen collecting roller 12 to rotate, thereby retracting the flexible projection screen 10, and simultaneously, the tension spring 8 can also be deformed, meanwhile, the negative pressure generating cylinder 28 will be restored to its original state, so that the negative pressure connected to the negative pressure seat 30 is reduced, and the flexible projection screen 10 will not be strained, and when the flexible projection screen 10 is retracted, the movable roller 18 can adhere to the dust on the surface of the flexible projection screen 10.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a holographic projection screen with adjustable holographic projection technique is with, includes upper portion keel frame (1), its characterized in that: the top fixed mounting of upper portion keel frame (1) has headstock (3), the positive movable mounting of headstock (3) has receipts rope roller (2), the side fixed mounting of upper portion keel frame (1) has connecting seat (6), the side swing joint of connecting seat (6) has projection screen support body (4), the side fixedly connected with of projection screen support body (4) and receipts rope roller (2) matched with flexible zip fastener (5), the quantity of projection screen support body (4) is three, and is three projection screen support body (4) are the rectangular frame.
2. The adjustable holographic projection screen for holographic projection technology of claim 1, wherein: the side of the inner cavity of the projection screen frame body (4) is provided with a movable cavity (7), the inner side of the inner cavity of the projection screen frame body (4) is positioned on the side of the movable cavity (7) and is provided with a trapezoidal cavity (9), the bottom of the inner cavity of the movable cavity (7) is fixedly connected with a tension spring (8), the top of the tension spring (8) is fixedly connected with a flexible clamping plate device (13), the side of the inner cavity of the movable cavity (7) is fixedly provided with a connecting negative pressure seat (30), the front of the connecting negative pressure seat (30) is fixedly provided with a negative pressure generating cylinder (28) communicated with the connecting negative pressure seat (30), the side of the flexible clamping plate device (13) is fixedly connected with a clamping seat (14) matched with the negative pressure generating cylinder (28), the side of the connecting negative pressure seat (30) is fixedly communicated with a flexible pull film (31), the side of the flexible pull film (31) is fixedly connected with a track seat (29) matched, the outside fixed mounting at projection screen support body (4) top has gear motor (11), inboard and fixedly connected with that the output of gear motor (11) extends to projection screen support body (4) receives curtain roller (12), the surface swing joint who receives curtain roller (12) has flexible projection curtain (10).
3. The adjustable holographic projection screen for holographic projection technology of claim 2, wherein: the side fixedly connected with buckle device (15) of flexible splint device (13), medial surface fixedly connected with inserted bar device (16) of flexible splint device (13), the inboard of flexible splint device (13) and the side activity joint of flexible projection curtain (10), the trompil with inserted bar device (16) matched with is seted up to the side of flexible projection curtain (10).
4. The adjustable holographic projection screen for holographic projection technology of claim 2, wherein: side fixedly connected with spring (17) of projection screen support body (4), the other end fixedly connected with activity roller (18) of spring (17), the quantity of activity roller (18) is two, two activity roller (18) are located the both sides of flexible projection screen (10) respectively, two the external fixed surface of activity roller (18) bonds and has the adhesion board.
5. The adjustable holographic projection screen for holographic projection technology of claim 1, wherein: the top of the connecting seat (6) is fixedly provided with a supporting frame (19), the side surface of the supporting frame (19) is movably provided with chain teeth (21) matched with the flexible zipper (5), the input end of the chain tooth (21) is fixedly connected with a first belt pulley (20), a second belt pulley (23) is movably arranged in the connecting seat (6), the first belt pulley (20) is in transmission connection with a second belt pulley (23) through a belt (22), a screw rod (24) is fixedly connected to the side surface of the second belt pulley (23), a support plate (25) is fixedly arranged on the front surface of the inner cavity of the connecting seat (6) below the screw rod (24), the outer surface of the screw rod (24) is provided with a movable seat (26) in a threaded manner, the bottom of the movable seat (26) is in sliding clamping connection with the top of the supporting plate (25), one end of an elastic clamping rod (27) is fixedly connected to the side surface of the movable seat (26).
6. The adjustable holographic projection screen for holographic projection technology of claim 2, wherein: the outer surface of the curtain collecting roller (12) is provided with an annular groove matched with the flexible clamping plate device (13).
7. The adjustable holographic projection screen for holographic projection technology of claim 5, wherein: the other end of the elastic clamping rod (27) is provided with an arc-shaped clamping joint.
8. The adjustable holographic projection screen for holographic projection technology of claim 2, wherein: the negative pressure generating cylinder (28) comprises an outer cylinder body, a piston, a pulling rod and a communicating port communicated with the connecting negative pressure seat (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010719971.7A CN111781794B (en) | 2020-07-23 | 2020-07-23 | Adjustable holographic projection screen for holographic projection technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010719971.7A CN111781794B (en) | 2020-07-23 | 2020-07-23 | Adjustable holographic projection screen for holographic projection technology |
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| Publication Number | Publication Date |
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| CN111781794A CN111781794A (en) | 2020-10-16 |
| CN111781794B true CN111781794B (en) | 2020-12-29 |
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| CN202010719971.7A Active CN111781794B (en) | 2020-07-23 | 2020-07-23 | Adjustable holographic projection screen for holographic projection technology |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2050641B (en) * | 1979-06-14 | 1983-01-26 | Harkness Screens Ltd | Raising and lowering flexible sheets eg roller blinds projection screens |
| US8035893B2 (en) * | 2004-05-12 | 2011-10-11 | Silas Creel | Collapsible projection screen systems |
| CN202120031U (en) * | 2011-06-24 | 2012-01-18 | 马鞍山市影星银幕有限公司 | Reeling type screen |
| CN206002835U (en) * | 2016-07-06 | 2017-03-08 | 上海盟云移软网络科技股份有限公司 | A kind of line holographic projections curtain rolling structure |
| CN106527032B (en) * | 2016-12-12 | 2018-07-17 | 广州市雄云视听设备有限公司 | A kind of electronic last volume projection screen |
| CN108681202A (en) * | 2018-07-24 | 2018-10-19 | 浙江佳合文化科技股份有限公司 | Line holographic projections performing art device |
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2020
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