CN108415214A - A kind of novel exhibitions projection screen frame - Google Patents
A kind of novel exhibitions projection screen frame Download PDFInfo
- Publication number
- CN108415214A CN108415214A CN201810125782.XA CN201810125782A CN108415214A CN 108415214 A CN108415214 A CN 108415214A CN 201810125782 A CN201810125782 A CN 201810125782A CN 108415214 A CN108415214 A CN 108415214A
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- China
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- rod
- head
- projection screen
- adjusting rod
- telescopic rod
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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
- G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Curtains And Furnishings For Windows Or Doors (AREA)
Abstract
The present invention relates to a kind of novel exhibitions projection screen frame, includes upper frame mounting and lower frame rack device with angle adjusting mechanism and length adjustment mechanism, be equipped with extension bar between.Length adjustment mechanism includes adjusting rod, and the telescopic rod that can be slided along its length is inserted in adjusting rod, and positioning component is equipped between adjusting rod and telescopic rod.Angle adjusting mechanism includes the tail end with telescopic rod and affixed the first connection end and second connection end head of adjusting rod head end respectively, is hinged with linear actuator between.The articulated link chain that the two can be hinged is equipped between two connection ends.Lower frame rack device further includes being respectively and fixedly connected to its head and the tail both ends top surface, universal joint with head rod.Upper frame mounting further includes being respectively and fixedly connected to its head and the tail both ends bottom surface, universal joint with the second connecting rod.The both ends of extension bar are detachably connected with two connecting rods respectively.It is equipped with removable and fixed positioning sleeve in the outer surface of universal joint.
Description
Technical field
The present invention relates to projection field more particularly to a kind of novel exhibitions projection screen framves.
Background technology
Projection screen is projector's peripheral equipment, by figure by projector to curtain, can by image into
Row amplification display, is one of commonly used equipment in exhibitions.Existing exhibition museum generally will not to adapt to not knowing for different exhibition booths
Fixed projection screen is set, and when projection screen size is larger, heavy workload, time are long when building and remove projection screen frame, make
It is very inconvenient for the equipment that uses temporarily；Currently, most of curtain is plane formula, but plane curtain is it is possible that angle
The reflective phenomenon that problem is brought needs arrangement arc, this has resulted in the increasing of cost when necessary in order to adapt to the needs of exhibition museum
Add.
Invention content
The present invention provides a kind of structure design advantages of simple, dismounting side to solve technical problem present in known technology
Just novel exhibitions projection screen frame, the present invention is versatile, and the curtain frame that can be used as flat curtain uses, and also can be used as arc curtain curtain frame makes
With.
The present invention is adopted the technical scheme that solve technical problem present in known technology：A kind of novel exhibitions use
Projection screen frame, including the upper frame mounting and lower frame rack device that are laterally arranged, set between upper frame mounting and lower frame rack device
There is the longitudinal extension bar that the two can be detachably connected；The upper frame mounting and lower frame rack device include angular adjustment machine
Structure, and it is connected with length adjustment mechanism at the head and the tail both ends of angle adjusting mechanism；
The length adjustment mechanism includes laterally setting and the adjusting rod with hollow cavity, in the hollow cavity of adjusting rod
Interior to be equipped with the telescopic rod that slided along adjusting rod length direction, it is fixed to be equipped between the inner cavity of adjusting rod and the periphery wall of telescopic rod
Hyte part；The angle adjusting mechanism include with the first connection end of the tail end Joint of telescopic rod and with adjusting rod head end phase
Affixed second connection end head is equipped with linear actuator, and linear drives between the first connection end and second connection end head
The head and the tail both ends of device are hinged with the opposite end face of the first connection end and second connection end head respectively；In the first connection end and
The articulated link chain that the two can be articulated and connected is equipped between two connection ends；
The lower frame rack device further includes the telescopic rod being respectively and fixedly connected to positioned at the adjusting rod top surface of head end and positioned at tail end
The universal joint of top surface is connected with head rod on the top of this universal joint；
The upper frame mounting further includes the telescopic rod being respectively and fixedly connected to positioned at the adjusting rod bottom surface of head end and positioned at tail end
The universal joint of bottom surface is connected with the second connecting rod in the bottom end of this universal joint；
The both ends of the longitudinal direction extension bar are detachably connected with head rod and the second connecting rod respectively；
It is arranged with positioning sleeve in the outer surface coaxial line of universal joint, it is hinged which can be fixed at universal joint
The outer surface at end, also slidably sets elsewhere.
Preferably：The positioning component includes the positioning seat for being fixed in adjusting rod inner cavity top surface tail end, the telescopic rod
Top surface, which is recessed to be formed downwards, can accommodate the groove of positioning seat；The bottom surface of positioning seat is neighbouring with the top surface of groove but does not contact, and recessed
The top surface of slot is equipped with the first rubbing surface extended along its length；Dovetail groove is offered in the bottom surface of positioning seat, dovetail groove
Two parallel bottom edges are each perpendicular to the top surface of groove, and long bottom edge is adjacent to the tail end of tail end, short bottom edge far from adjusting rod of adjusting rod,
The second rubbing surface is equipped on the inclined-plane of dovetail groove；It is coarse it to be equipped with a periphery wall in the space that dovetail groove and groove top surface are constituted
Friction column, and the diameter of friction column be more than dovetail groove short bottom edge length, be less than long bottom edge length.
Preferably：The positioning component further includes the spring catch affixed in the tail end of telescopic rod, in the periphery wall of adjusting rod
Corresponding position offers the through-hole that can accommodate spring catch pin.
Preferably：The extension bar is used with head rod and the second connecting rod and is threadedly coupled.
Preferably：The extension bar uses detachable plug connection with head rod and the second connecting rod.
Preferably：It is equipped with one end external screw thread adjacent to the end of universal joint in head rod and the second connecting rod,
The inner wall of positioning sleeve is equipped with the internal thread being screwed with the external screw thread.
Preferably：The upper frame mounting and lower frame rack device include at least two groups length adjustment mechanism and one group of angle
Regulating mechanism.
The advantages and positive effects of the present invention are：The present invention provides a kind of novel exhibitions projection screen framves, with existing skill
Art is compared, and the present invention includes the adjustable in length of the upper frame mounting and lower frame rack device of adjusting rod and telescopic rod, can basis
The length of the different adjustment projection screen frame of exhibition or museum, and head rod and the second connecting rod respectively by universal joint with
Adjusting rod or telescopic rod are connected, convenient for the dismounting installation and transport of projection screen frame.It is made of positioning seat, friction column and rubbing surface
Positioning component, projection screen frame can be made when in use, telescopic rod can freely adjust stretching adjusting rod, but be unable to retraction, ensure that
Normal use；For projection screen frame in dismounting, telescopic rod can be flexible relative to adjusting rod.In addition, when needing using arc curtain frame,
It can be acted by linear actuator so that projection screen frame deforms, so that the curtain being arranged on projection screen frame becomes one
Arc curtain improves the versatility of projection screen frame.
Description of the drawings
Fig. 1 is the preferred main structure diagram of the present invention；
Fig. 2 is the A-A schematic cross-sectional views in Fig. 1；
Fig. 3 is the B-B schematic cross-sectional views in Fig. 1；
Fig. 4 be the present invention be flat curtain when vertical view broken section structural schematic diagram；
Fig. 5 is the C-C schematic cross-sectional views in Fig. 4；
Fig. 6 is the schematic cross-sectional view in telescopic rod retraction adjusting rod；
Fig. 7 be the present invention be arc curtain when vertical view broken section structural schematic diagram.
In figure：1, adjusting rod；2, telescopic rod；2-1, groove；2-2, the first rubbing surface；3, the first connection end；4, hinged
Chain；5, linear actuator；6, second connection end head；7, third connection end；8, head rod；9, universal joint；10, it positions
Set；11, extension bar；12, the second connecting rod；13, positioning seat；13-1, dovetail groove；13-2, the second rubbing surface；14, friction column；
15, spring catch.
Specific implementation mode
In order to further understand the content, features and effects of the present invention, hereby lifting following embodiment, detailed description are as follows：
Refer to Fig. 1 to Fig. 6, the present invention includes the upper frame mounting being laterally arranged and lower frame rack device, rack-mounted in upper ledge
Set the longitudinal extension bar 11 that is equipped with and the two can be detachably connected between lower frame rack device.The upper frame mounting and lower frame
Device includes angle adjusting mechanism, and is connected with length adjustment mechanism at the head and the tail both ends of angle adjusting mechanism.
The length adjustment mechanism includes laterally setting and the adjusting rod 1 with hollow cavity, in the hollow interior of adjusting rod 1
Intracavitary is equipped with the telescopic rod 2 that can be slided along 1 length direction of adjusting rod, between the inner cavity of adjusting rod 1 and the periphery wall of telescopic rod 2
Equipped with positioning component.The angle adjusting mechanism include with the first connection end 3 of the tail end Joint of telescopic rod 2 and with adjusting
The second connection end head 6 of 1 head end Joint of bar is equipped with linear actuator between the first connection end 3 and second connection end head 6
5, and the head and the tail both ends of linear actuator 5 are hinged with the opposite end face of the first connection end 3 and second connection end head 6 respectively.
The articulated link chain 4 that the two can be articulated and connected is equipped between first connection end 3 and second connection end head 6.
With further reference to Fig. 7, when needing using arc curtain, starts linear actuator 5, pass through 5 He of linear actuator
The hinge joint of the hinged adjusting rod 1 of articulated link chain 4 and the meeting of telescopic rod 2 in the horizontal plane around articulated link chain 4 rotates a certain angle, until
So that projection screen frame forms a continuous circular arc.With further reference to Fig. 4, when needing using flat curtain, driving linear actuator 5 makes
Adjusting rod 1 and telescopic rod 2 reset, until the two is in a straight line.According to actual needs, the linear actuator 5 can be used electronic
Cylinder can also be used in push rod.
With further reference to Fig. 2 and Fig. 3, the lower frame rack device further includes being respectively and fixedly connected to push up positioned at the adjusting rod 1 of head end
Face and universal joint 9 positioned at 2 top surface of telescopic rod of tail end, head rod 8 is connected on the top of this universal joint 9.
The upper frame mounting further includes being respectively and fixedly connected to positioned at 1 bottom surface of adjusting rod of head end and the telescopic rod positioned at tail end
The universal joint 9 of 2 bottom surfaces is connected with the second connecting rod 12 in the bottom end of this universal joint 9.
The both ends of the longitudinal direction extension bar 11 are detachably connected with head rod 8 and the second connecting rod 12 respectively.
It is arranged with positioning sleeve 10 in the outer surface coaxial line of universal joint 9, which can be fixed at Universal connector
The outer surface of first 9 hinged end, also slidably sets elsewhere.
The setting of universal joint 9 and positioning sleeve 10 makes the installation easy to disassemble of projection screen frame and transport.Different length can be had
The extension bar 11 of degree can change the height of projection screen frame according to different needs.
The adjusting rod 1, telescopic rod 2, head rod 8, the second connecting rod 12 and extension bar 11 are closed by high intensity aluminium
Gold is made so that it is flexible from heavy and light, rotation.
With further reference to Fig. 5 and Fig. 6, the positioning component includes the positioning seat for being fixed in 1 inner cavity top surface tail end of adjusting rod
13, the top surface of the telescopic rod 2 is recessed downwards the groove 2-1 for being formed and can accommodating positioning seat 13.The bottom surface of positioning seat 13 and groove
The top surface of 2-1 is neighbouring but does not contact, and the top surface of groove 2-1 is equipped with the first rubbing surface 2-2 extended along its length.This
The configuration of surface of one rubbing surface 2-2 is not refused, such as uniform male and fomale(M＆F) or non-homogeneous male and fomale(M＆F), should in the present embodiment Fig. 5 and Fig. 6
First rubbing surface 2-2 is made of evenly distributed and vertical length direction serration item.It is offered in the bottom surface of positioning seat 13 trapezoidal
The two parallel bottom edges of slot 13-1, dovetail groove 13-1 are each perpendicular to the top surface of groove 2-1, and long bottom edge adjacent to adjusting rod 1 tail end,
Tail end of the short bottom edge far from adjusting rod 1.The opening of dovetail groove 13-1 is towards the first rubbing surface 2-2, and its inclined-plane rubs far from first
Wiping face 2-2.The second rubbing surface 13-2 is equipped on the inclined-plane of dovetail groove 13-1, the configuration of surface of the second rubbing surface 13-2 is not refused,
Such as uniform male and fomale(M＆F) or non-homogeneous male and fomale(M＆F), in the present embodiment Fig. 5 and Fig. 6, the second rubbing surface 13-2 is by evenly distributed and vertical
The serration item of straight chamfer length extending direction is constituted.It is equipped with outside one in the space that dovetail groove 13-1 and the top surfaces groove 2-1 are constituted
The coarse friction column 14 of peripheral wall, and the diameter of friction column 14 is more than the short bottom edge length of dovetail groove 13-1, is less than long bottom edge length.
The friction column 14 is movably arranged in dovetail groove 13-1, and its periphery wall is the rubbing surface that configuration of surface is regardless of, and can be uniformly recessed
Convex surface or non-homogeneous male and fomale(M＆F) rub for evenly distributed, parallel friction column central shaft and in the present embodiment Fig. 5 and Fig. 6 with second
The serration item of wiping face 13-2 corresponds to the serration item of toe joint.
The positioning component further includes the spring catch 15 affixed in the head end of telescopic rod 2, is corresponded in the periphery wall of adjusting rod 1
Position offers the through-hole that can accommodate 15 pin of spring catch.Spring catch 15 and through-hole setting can prevent 2 outreach of telescopic rod
It is excessive, it is detached from adjusting rod 1.
It connect with the telescopic rod 2 at lower frame rack device and upper frame mounting tail end for the ease of universal joint 9, stretches herein
The tail end of bar 2 is connected with third connection end 7.
As shown in figure 5, when the first rubbing surface 2-2 of frame mounting and upper frame mounting is upward instantly, positioning component rubs
It wipes column 14 to contradict on the first rubbing surface 2-2 of the top surfaces groove 2-1, when telescopic rod 2 is protruding, the first rubbing surface can be passed through
At the long bottom edge for the dovetail groove 13-1 that 2-2 friction drive friction columns 14 are displaced to positioning seat 13, and make telescopic rod 2 relative to adjusting
Bar 1 can freely adjust stretching.When telescopic rod 2 is relative to 1 inside retraction of adjusting rod, the first rubbing surface 2-2 friction band dynamic friction
Column 14 is displaced at the short bottom edge of the dovetail groove 13-1 of positioning seat 13, and the friction column 14 friction pushes against in the first rubbing surface 2-2, determines
Between the short bottom edges dovetail groove 13-1 and the second rubbing surface 13-2 of dovetail groove 13-1 of position seat 13, make telescopic rod 2 relative to adjusting
Bar 1 cannot freely adjust retraction.
As shown in fig. 6, when the first rubbing surface 2-2 of frame mounting and upper frame mounting is downward instantly, positioning component rubs
It wipes column 14 and leaves the first rubbing surface 2-2 conflicts on the inclined-plane of the dovetail groove 13-1 of positioning seat 13, contracting bar 2 is relative to adjusting rod 1
It can free telescopic moving.
In the present embodiment, when the larger tooth pitch of serration strip adoption, the distance of relative movement is larger, when using smaller tooth pitch
When, the distance of relative movement is smaller.
As shown in Figures 2 and 3, in the present embodiment, the extension bar 11 is adopted with head rod 8 and the second connecting rod 12
It is threadedly coupled.
Extension bar 11 can also be used other with head rod 8 and the second connecting rod 12 and detachably connect in other embodiments
It connects, such as detachable plug connection.
As shown in Figure 1, Figure 2 and Figure 3, it is all provided with adjacent to the end of universal joint 9 in head rod 8 and the second connecting rod 12
There is one end external screw thread, the internal thread being screwed with the external screw thread is equipped in the inner wall of positioning sleeve 10.In the installation of projection screen frame
During use, positioning sleeve 10 can the effect that screws togather of screw thread be fixed on the outer surface of 9 hinged end of universal joint so that extension bar
11, head rod 8 and the second connecting rod 12 are in a straight line, when needing to dismantle projection screen and transported, disconnect and lengthening
Positioning sleeve 10 is rotated and is moved to elsewhere, to head rod 8 by the connection of bar 11 and head rod 8 and the second connecting rod 12
It is folded with the second connecting rod 12, it is possible to reduce the occupied space of lower frame rack device and upper frame mounting
The upper frame mounting and lower frame rack device include at least two groups length adjustment mechanism and one group of angular adjustment machine
Structure.
The present invention positioning seat 13, friction column 13 and can rub according to exhibition or the length of the different adjustment projection screen frame of museum
The positioning component that wiping face is constituted, can make projection screen frame when in use, and telescopic rod 2, which can be adjusted freely, stretches out adjusting rod 1, but cannot contract
Enter, ensure that normal use；For projection screen frame in dismounting, telescopic rod 2 can be flexible relative to adjusting rod 1.In addition when needing to use
It when arc curtain frame, can be acted by linear actuator so that projection screen frame deforms, so that the curtain on projection screen frame is arranged
Cloth becomes an arc curtain, improves the versatility of projection screen frame.
Claims (7)
1. a kind of novel exhibitions projection screen frame, it is characterized in that：Including the upper frame mounting being laterally arranged and lower frame rack device,
The longitudinal extension bar (11) that the two can be detachably connected is equipped between upper frame mounting and lower frame rack device；The upper ledge is rack-mounted
It includes angle adjusting mechanism to set with lower frame rack device, and is connected with length adjustment machine at the head and the tail both ends of angle adjusting mechanism
Structure；
The length adjustment mechanism includes laterally setting and the adjusting rod (1) with hollow cavity, in the hollow interior of adjusting rod (1)
Intracavitary is equipped with the telescopic rod (2) that can be slided along adjusting rod (1) length direction, in the outer of the inner cavity of adjusting rod (1) and telescopic rod (2)
Positioning component is equipped between peripheral wall；The angle adjusting mechanism includes the first connecting pin with the tail end Joint of telescopic rod (2)
Head (3) and the second connection end head (6) with adjusting rod (1) head end Joint, in the first connection end (3) and second connection end head
(6) between be equipped with linear actuator (5), and the head and the tail both ends of linear actuator (5) respectively with the first connection end (3) and second
The opposite end face of connection end (6) is hinged；Being equipped between the first connection end (3) and second connection end head (6) can be by the two
The articulated link chain (4) of articulated connection；
The lower frame rack device further includes being respectively and fixedly connected to positioned at adjusting rod (1) top surface of head end and the telescopic rod positioned at tail end
(2) universal joint (9) of top surface is connected with head rod (8) on the top of this universal joint (9)；
The upper frame mounting further includes being respectively and fixedly connected to positioned at adjusting rod (1) bottom surface of head end and the telescopic rod positioned at tail end
(2) universal joint (9) of bottom surface is connected with the second connecting rod (12) in the bottom end of this universal joint (9)；
The both ends of the longitudinal direction extension bar (11) are detachably connected with head rod (8) and the second connecting rod (12) respectively；
It is arranged with positioning sleeve (10) in the outer surface coaxial line of universal joint (9), which can be fixed at universal
The outer surface of connector (9) hinged end, also slidably sets elsewhere.
2. novel exhibitions projection screen frame as described in claim 1, it is characterized in that：The positioning component includes being fixed in adjusting
The positioning seat (13) of bar (1) inner cavity top surface tail end, the top surface of the telescopic rod (2), which is recessed to be formed downwards, can accommodate positioning seat (13)
Groove (2-1)；The bottom surface of positioning seat (13) is neighbouring with the top surface of groove (2-1) but does not contact, and the top surface of groove (2-1) is set
There is the first rubbing surface (2-2) extended along its length；Dovetail groove (13-1) is offered in the bottom surface of positioning seat (13), it is trapezoidal
Two parallel bottom edges of slot (13-1) are each perpendicular to the top surface of groove (2-1), and tail end of the long bottom edge adjacent to adjusting rod (1), short bottom
The outlying tail end from adjusting rod (1) is equipped with the second rubbing surface (13-2) on the inclined-plane of dovetail groove (13-1)；In dovetail groove (13-
1) the coarse friction column (14) of a periphery wall, and the diameter of friction column (14) and in the space of the top surface groove (2-1) composition are equipped with
More than the short bottom edge length of dovetail groove (13-1), less than long bottom edge length.
3. novel exhibitions projection screen frame as claimed in claim 2, it is characterized in that：The positioning component further includes in telescopic rod
(2) the affixed spring catch (15) of head end, spring catch (15) pin can be accommodated by being offered in the periphery wall corresponding position of adjusting rod (1)
The through-hole of column.
4. novel exhibitions projection screen frame as described in claim 1, it is characterized in that：The extension bar (11) and head rod
(8) and the second connecting rod (12) is using threaded connection.
5. novel exhibitions projection screen frame as described in claim 1, it is characterized in that：The extension bar (11) and head rod
(8) and the second connecting rod (12) uses detachable plug connection.
6. novel exhibitions projection screen frame as described in claim 1, it is characterized in that：It is connected in head rod (8) and second
The end of the neighbouring universal joint (9) of bar (12) is equipped with one end external screw thread, is equipped with and the outer spiral shell in the inner wall of positioning sleeve (10)
The internal thread that line is screwed.
7. novel exhibitions projection screen frame as described in claim 1, it is characterized in that：The upper frame mounting and lower frame rack device
Include at least two groups length adjustment mechanism and one group of angle adjusting mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810125782.XA CN108415214B (en) | 2018-02-08 | 2018-02-08 | Novel projection curtain frame for exhibitions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810125782.XA CN108415214B (en) | 2018-02-08 | 2018-02-08 | Novel projection curtain frame for exhibitions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108415214A true CN108415214A (en) | 2018-08-17 |
| CN108415214B CN108415214B (en) | 2021-04-20 |
Family
ID=63128077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810125782.XA Active CN108415214B (en) | 2018-02-08 | 2018-02-08 | Novel projection curtain frame for exhibitions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108415214B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113443263A (en) * | 2020-03-24 | 2021-09-28 | 辽宁工业大学 | Portable digital media containing box |
| CN113674560A (en) * | 2021-08-26 | 2021-11-19 | 河北建材职业技术学院 | Multimedia teaching is with throwing screen device |
| TWI755978B (en) * | 2020-12-17 | 2022-02-21 | 快奌科技股份有限公司 | Method for improving image distortion of projection screen and projection screen assembly implementing the method |
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| CN2081333U (en) * | 1990-11-26 | 1991-07-24 | 镇江减速机厂 | Adjustable spanner |
| CN201749286U (en) * | 2010-06-01 | 2011-02-16 | 广州美视晶莹银幕有限公司 | Manual-adjustment masked frame screen |
| CN204241827U (en) * | 2014-12-08 | 2015-04-01 | 窦志刚 | Integral foldable framework projection screen |
| CN204659770U (en) * | 2015-04-08 | 2015-09-23 | 青岛特拉斯汽车技术有限公司 | A kind of fixture vehicle of scalable adjustment |
| CN106195559A (en) * | 2016-08-25 | 2016-12-07 | 昆山泓杰电子股份有限公司 | The regulation supporting mechanism of display bracket |
| CN206321936U (en) * | 2016-12-30 | 2017-07-11 | 昆明医科大学 | A kind of Portable teaching curtain |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2081333U (en) * | 1990-11-26 | 1991-07-24 | 镇江减速机厂 | Adjustable spanner |
| CN201749286U (en) * | 2010-06-01 | 2011-02-16 | 广州美视晶莹银幕有限公司 | Manual-adjustment masked frame screen |
| CN204241827U (en) * | 2014-12-08 | 2015-04-01 | 窦志刚 | Integral foldable framework projection screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113443263A (en) * | 2020-03-24 | 2021-09-28 | 辽宁工业大学 | Portable digital media containing box |
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| TWI755978B (en) * | 2020-12-17 | 2022-02-21 | 快奌科技股份有限公司 | Method for improving image distortion of projection screen and projection screen assembly implementing the method |
| CN113674560A (en) * | 2021-08-26 | 2021-11-19 | 河北建材职业技术学院 | Multimedia teaching is with throwing screen device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108415214B (en) | 2021-04-20 |
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