CN104360576B - Luffing framework projection screen in length and breadth - Google Patents
Luffing framework projection screen in length and breadth Download PDFInfo
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- CN104360576B CN104360576B CN201410736376.9A CN201410736376A CN104360576B CN 104360576 B CN104360576 B CN 104360576B CN 201410736376 A CN201410736376 A CN 201410736376A CN 104360576 B CN104360576 B CN 104360576B
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- frame
- telescopic
- stretch
- spool
- luffing
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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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
One of the present invention luffing framework projection screen in length and breadth, it includes the first spool and the second spool, be characterized in: also include framework, bearing and curtain, described framework by two as the first of left and right side frame stretch frame, stretch as the second of upper side frame frame and as the 3rd of lower frame stretch frame successively alternately symmetry be connected and form；At the back side of framework, the stretch two ends of frame of two pieces first frames and second that stretch are connected bearing respectively, first spool be placed in first stretch frame two ends arrange bearing between and be connected, the second spool be placed in second stretch frame two ends arrange bearing between and be connected；Described curtain is for being inverted T-shaped, the curtain being inverted T-shaped is placed between framework and the first spool or the second spool, the both sides of curtain bottom are connected with the first spool respectively, top and the second spool are connected, between edge, framework and the curtain beyond magnetic stripe is placed in curtain and the first spool or the second spool is connected and be connected.
Description
Technical field
The present invention relates to projection screen, be one luffing framework projection screen in length and breadth.
Background technology
Projection screen is used in film, office, home theater and convention occasion for showing image, video file
The instrument of projection image.The projection image of prior art is according to length and width score 1.78:1(16:9), 2.35:1(21:9) etc. difference
Breadth, the user of most viewing projection images the most only uses the projection screen of a kind of breadth, when viewing and projection screen breadth used
During different projection image, the direction size needing to make projection image is equidirectional equivalently-sized with projection screen used,
Black surround or image cutting is there will be, although can watch and projection screen used beyond the image boundary in another direction of projection screen
The projection image that breadth is different, but the black surround on projection screen or image cutting can disturb viewing projection image.Also employing is had to hide
Breadth plate slip shield portions curtain, it is achieved non-shield portions curtain Aspect Ratio changes, corresponding different Aspect Ratio projection shadows
Picture, eliminates on general fixed frame curtain black surround or the image cutting of display, but shield portions be still in projection screen framework it
In, even if the tolerance of (completely black audio-visual room falls within low light environment because of projector luminescence) human eye still is able to standard under low light environment
Really identification image boundary and framework border, it is also possible to the existence of cropping panel in framework of identification border, affects viewing effect.And
Said method there is also a common shortcoming, i.e. when watching the projection image different from projection screen breadth used, and image limit
There will be black surround or image cutting beyond boundary, the projected area of its projection image is less than projection screen area used, i.e. after cropping
Imagery coverage, less than the imagery coverage before cropping, is equivalent to watch small breadth projection image.
Summary of the invention
The technical problem to be solved is: the shortcoming overcoming prior art, it is provided that one luffing framework in length and breadth is thrown
Shadow curtain, can drive curtain folding and unfolding by telescopic slide frame, adjust the projection screen size of both direction respectively, change projection
Curtain Aspect Ratio, makes projection screen framework accurately agree with image boundary, and the image for the multiple different the ratio of width to height of viewing provides one
Perfect imaging region, it is achieved thoroughly eliminate black surround or image cutting that image occurs, the projection of projection image can be kept again
Area, obtains optimal and maximum viewing effect.
The present invention solves the scheme of technical problem: one luffing framework projection screen in length and breadth, and it includes the first spool and
Two spools, is characterized in that: also include framework, bearing and curtain, and described framework is stretched limit as the first of left and right side frame by two
Frame, stretch as the second of upper side frame frame and as the 3rd of lower frame stretch frame successively alternately symmetry be connected composition；?
The stretch two ends of frame of the back side of framework, two pieces first frames and second that stretch are connected bearing respectively, and the first spool is placed in
One stretch frame two ends arrange bearing between and be connected, the second spool be placed in second stretch frame two ends arrange bearing between
And be connected；Described curtain is for being inverted T-shaped, and the curtain being inverted T-shaped is placed between framework and the first spool or the second spool, under curtain
The both sides in portion respectively be connected in that the first the first spool stretching on frame is connected, top stretches on frame with being connected in second
Second spool is connected, a pair magnetic stripe be placed in curtain and the first spool or the second spool connected beyond edge, framework and curtain it
Between and be connected.
Described first structure stretching frame is: it includes the first fixed frame, the first telescopic frame and luffing push-pull bar, described
First fixed frame is that the inside grooved of opening, two ends are respectively fixedly connected with bearing, and the first telescopic frame is rectangular tube, and the first telescopic frame is placed in
One end of first fixed frame, termination are stretched in the first fixed frame and are slidably connected, the other end of the first telescopic frame with as top
The second of frame frame termination of stretching is connected, and the other end of the first fixed frame is solid with as the 3rd of lower frame frame termination of stretching
Even, luffing push-pull bar is built in the first fixed frame, and one end of luffing push-pull bar and the first fixed frame are connected, the other end and first
Telescopic frame is connected, and first stretches the first fixed frame of frame downwards respectively as left and right side frame.
Also set up anticreep slide block in described first fixed frame, also set up corresponding with the first fixed frame slide block outside the first telescopic frame
Anticreep chute, anticreep slide block is slidably connected with anticreep chute.
Described second structure stretching frame is: it includes the second fixed frame, the second telescopic frame, the 3rd telescopic frame and luffing
Push-pull bar, described second fixed frame is that the inside grooved of opening, two ends are respectively fixedly connected with bearing, and the second telescopic frame is rectangular tube, and
Two telescopic frames are placed in one end of the second fixed frame, termination is stretched in the second fixed frame and is slidably connected, another of the second telescopic frame
End is connected with the first telescopic frame termination of one first frame that stretches；3rd telescopic frame is rectangular tube, and the 3rd telescopic frame is placed in
The other end of two fixed frames, termination stretch in the second fixed frame and are slidably connected, the other end of the 3rd telescopic frame and another root the
One the first telescopic frame termination stretching frame is connected, and two luffing push-pull bars are built in two ends in the second fixed frame respectively, each
One end of luffing push-pull bar and the second fixed frame are connected, the other end is connected with the second telescopic frame or the 3rd telescopic frame, a pair magnetic stripe
It is respectively placed on the second telescopic frame or the 3rd telescopic frame and curtain correspondence position being connected.
Described 3rd stretch structure and the annexation of frame is essentially identical with second frame that stretches, and difference is:
Second fixed frame two ends need not be connected bearing, the other end of the second telescopic frame or the 3rd telescopic frame respectively with two first limits of stretching
First fixed frame termination of frame is connected.
Also set up in described second fixed frame and also set up outside anticreep slide block, the second telescopic frame or the 3rd telescopic frame with second admittedly
Determining the anticreep chute that frame slide block is corresponding, anticreep slide block is slidably connected with anticreep chute.
Described magnetic stripe is several magnetic piece arranged successively.
The use process of present invention luffing framework projection screen in length and breadth is: when the projection that viewing is different from projection screen breadth used
During image, first start second stretch frame and the 3rd stretch frame be connected luffing push-pull bar, luffing push-pull bar drive second
Flexible frame and the 3rd stretch frame shift-reduce breadth time, the first spool that frame is connected furls simultaneously also to drive first to stretch
Curtain, accurately agrees with until projection screen breadth is reduced to framework by luffing push-pull bar with image right boundary, and the first spool stops
Retracting curtain, then start first stretch frame be connected luffing push-pull bar, luffing push-pull bar drive first stretch frame move
During dynamic increase breadth, also drive the second spool to discharge curtain, until projection screen breadth is increased to framework by luffing push-pull bar simultaneously
Accurately agreeing with image coboundary, the second spool stops retracting curtain；Review the throwing identical with projection screen breadth used
During shadow image, starting first and stretch the luffing push-pull bar that frame is connected, luffing push-pull bar drives first to stretch frame shift-reduce
Breadth, also drives the second spool to furl curtain simultaneously, until breadth is reduced on projection screen framework and image by luffing push-pull bar
Boundary accurate agrees with, second spool stop release curtain, then start second stretch frame and the 3rd stretch frame be connected change
Width push-pull bar, luffing push-pull bar drive second stretch frame and the 3rd stretch frame move increase breadth time, also drive first
Spool discharges curtain simultaneously, until projection screen breadth is increased to framework and accurately agrees with i.e. with image right boundary by luffing push-pull bar
Can.
Present invention luffing framework projection screen in length and breadth provides the benefit that: changed by the first time moving telescopic of flexible frame
Curtain is rolled up the synchronization action put and is carried out a luffing, then moved by the second time of flexible frame by length, drive spool
The synchronization action put rolled up by curtain by flexible change height, drive spool, it is possible to meet different breadths throwing at projection screen used
While shadow image, keep the projected area of projection image, make the framework of projection screen used accurately agree with image boundary, the fullest
The attractive in appearance of projection image watched by foot projection screen used, avoids again the black surround on projection screen or image cutting edge that viewing can be disturbed to throw
Shadow image, obtains optimal and maximum viewing effect, makes spectators at the video image of identical sighting distance position viewing different proportion
All can see image of the same area.There is simple in construction, advantage with low cost.
Accompanying drawing explanation
Fig. 1 is the schematic front view of present invention luffing framework projection screen in length and breadth；
Fig. 2 is the schematic top plan view of Fig. 1；
Fig. 3 is the left view schematic diagram of Fig. 1；
Fig. 4 is present invention schematic front view after luffing framework projection screen once adjusts breadth in length and breadth；
Fig. 5 is the schematic front view after present invention luffing framework projection screen secondary in length and breadth adjusts breadth；
Fig. 6 is the left view schematic diagram of Fig. 5.
In figure: 1 second telescopic frame, 2 first telescopic frames, 3 luffing push-pull bars, 4 first fixed frames, 5 curtains, 6
Two fixed frames, 7 second stretch frame, 8 the 3rd telescopic frames, and 9 first stretch frame, and 10 the 3rd stretch frame, 11 first volumes
Axle, 12 bearings, 13 magnetic stripes, 14 second spools.
Detailed description of the invention
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
With reference to Fig. 1～Fig. 6, the present embodiment one luffing framework projection screen in length and breadth, it includes first spool the 11, second spool
14, framework, bearing 12 and curtain 5, described framework by two as the first of left and right side frame stretch frame 9, as upper side frame
Second stretch frame 7 and as the 3rd of lower frame stretch frame 10 successively alternately symmetry be connected composition；At the back side of framework, two
Root first stretch two ends of frame 7 of frame 9 and second of stretching are connected bearing 12 respectively, and the first spool 11 is placed in first and stretches limit
Frame 9 two ends arrange bearing 12 between and be connected, the second spool 14 be placed in second stretch frame 7 two ends arrange bearing 12 between
And be connected；Described curtain 5 is for being inverted T-shaped, and the curtain 5 being inverted T-shaped is placed between framework and the first spool 11 or the second spool 14,
The both sides of curtain 5 bottom respectively be connected in that the first the first spool 11 stretching on frame 9 is connected, top is stretched with being connected in second
The second spool 14 on cissing frame 7 is connected, a pair magnetic stripe 13 be placed in curtain 5 connected with the first spool 11 or the second spool 14 beyond
Edge, framework and curtain 5 between and be connected.Described first structure stretching frame 9 is: it includes the first fixed frame 4, first
Telescopic frame 2 and luffing push-pull bar 3, described first fixed frame 4 grooved inside in opening, two ends be respectively fixedly connected with bearing 12, and first
Telescopic frame 2 is rectangular tube, the first telescopic frame 2 is placed in one end of the first fixed frame 4, termination stretch into the first fixed frame 4 in and slide
Connect, the other end of the first telescopic frame 2 with as the second of upper side frame stretch frame 7 the second telescopic frame 1 termination be connected, first
The other end of fixed frame 4 with as the 3rd of lower frame stretch frame 10 the second telescopic frame 1 termination be connected, luffing push-pull bar 3
Being built in the first fixed frame 4, one end of luffing push-pull bar 3 and the first fixed frame 4 are connected, the other end is consolidated with the first telescopic frame 2
Even, first stretches the first fixed frame 4 of frame 9 downwards respectively as left and right side frame.Anticreep is also set up in described first fixed frame 4
Slide block, also sets up the anticreep chute corresponding with the first fixed frame 4 slide block outside the first telescopic frame 2, anticreep slide block is sliding with anticreep chute
It is dynamically connected.Described second structure stretching frame 7 is: it includes second fixed frame the 6, second telescopic frame the 1, the 3rd telescopic frame 8 and
Luffing push-pull bar 3, described second fixed frame 6 grooved inside in opening, two ends are respectively fixedly connected with bearing 12, and the second telescopic frame 1 is
Rectangular tube, the second telescopic frame 1 is placed in one end of the second fixed frame 6, termination stretch into the second fixed frame 6 in and be slidably connected, second
First telescopic frame 2 termination of the other end of telescopic frame 1 and one first frame 9 that stretches is connected；3rd telescopic frame 8 is rectangular tube,
3rd telescopic frame 8 is placed in the other end of the second fixed frame 6, termination stretch into the second fixed frame 6 in and be slidably connected, the 3rd telescopic frame
Stretch the first telescopic frame 2 termination of frame 9 of the other end of 8 and another root first is connected, and two luffing push-pull bars 3 are built in respectively
Two ends in second fixed frame 6, one end of each luffing push-pull bar 3 and the second fixed frame 6 are connected, the other end and the second telescopic frame 1
Or the 3rd telescopic frame 8 be connected, a pair magnetic stripe 13 is respectively placed on the second telescopic frame 1 or the 3rd telescopic frame 8 and curtain 5 correspondence position
And be connected.Described 3rd the stretch structure of frame 10, annexation is essentially identical with second frame 7 that stretches, and difference is:
Second fixed frame 6 two ends need not be connected bearing 12, the other end of the second telescopic frame 1 or the 3rd telescopic frame 8 respectively with two first
First fixed frame 4 termination of flexible frame 9 is connected.Also set up anticreep slide block in described second fixed frame 6, the second telescopic frame 1 or
Also setting up the anticreep chute corresponding with the second fixed frame 6 slide block outside 3rd telescopic frame 8, anticreep slide block is with anticreep slide even
Connect.Described magnetic stripe 13 is several magnetic piece arranged successively.The present embodiment employing prior art manufacture, described first spool 11,
Second spool 14 and luffing push-pull bar 3 are the commercially available prod of prior art.
The use process of the present embodiment is: when watching different from projection screen breadth used projection image, first starts the
Two frames 7 and the 3rd that stretch stretch the luffing push-pull bar 3 that frame 10 is connected, and drive second to stretch frame 7 He at luffing push-pull bar 3
3rd stretch frame 10 shift-reduce breadth time, also drive the first spool 11 to furl curtain 5 simultaneously, until luffing push-pull bar 3 will
Projection screen breadth is reduced to framework accurately to be agreed with image right boundary, and the first spool 11 stops retracting curtain 5, then starts the
One stretches luffing push-pull bar 3 that frame 9 is connected, luffing push-pull bar 3 drive first stretch frame 9 move increase breadth time, also
Drive the second spool 14 to discharge curtain 5, until projection screen breadth is increased to framework and image coboundary by luffing push-pull bar 3 simultaneously
Accurately agreeing with, the second spool 14 stops retracting curtain 5；When reviewing the projection image identical with projection screen breadth used,
Starting first to stretch the luffing push-pull bar 3 that frame 9 is connected, luffing push-pull bar 3 drives first to stretch frame 9 shift-reduce breadth,
Also drive the second spool 14 to furl curtain 5, until breadth is reduced to projection screen framework and image top by luffing push-pull bar 3 simultaneously
Boundary accurately agrees with, and the second spool 14 stops release curtain 5, then starts second frame 7 and the 3rd frame 10 that stretches that stretches and is connected
Luffing push-pull bar 3, luffing push-pull bar 3 drive second stretch frame 7 and the 3rd stretch frame 10 move increase breadth time, also
Drive the first spool 11 to discharge curtain 5, until projection screen breadth is increased to framework and limit, image left and right by luffing push-pull bar 3 simultaneously
Boundary accurately agrees with.
Claims (6)
1. a luffing framework projection screen in length and breadth, it includes the first spool and the second spool, it is characterized in that: also include framework,
Seat and curtain, described framework by the first of left frame stretch frame, the second of upper side frame stretch frame, the first of left frame stretch
The 3rd of frame and the lower frame frame head and the tail that stretch are connected composition the most successively, and concrete structure is: left frame and the first of left frame
Flexible frame includes that the first fixed frame and the first telescopic frame, the first fixed frame and the first telescopic frame are connected by luffing push-pull bar,
The second of upper side frame the 3rd of frame and the lower frame frame that stretches that stretches all includes that the second fixed frame, the second telescopic frame and the 3rd are stretched
Contracting frame, the second fixed frame and the second telescopic frame, the second fixed frame and the 3rd telescopic frame are connected by luffing push-pull bar respectively, left
The first of frame stretches frame, its first fixed frame and the 3rd stretch the second telescopic frame of frame be connected, the first telescopic frame and the
Two the second telescopic frames stretching frame are connected, and the first of left frame stretches frame, and its first fixed frame and the 3rd stretches frame
3rd telescopic frame be connected, the first telescopic frame and second stretch frame the 3rd telescopic frame be connected composition framework；At the back side of framework,
Two first frames and second that stretch frame two ends of stretching are connected bearing respectively, and the first spool is placed in first and stretches frame two ends
Arrange bearing between and be connected, the second spool be placed in second stretch frame two ends arrange bearing between and be connected；Described curtain
Cloth is for being inverted T-shaped, and the curtain being inverted T-shaped is placed between framework and the first spool and the second spool, and the both sides of curtain bottom are respectively
First the first spool stretching on frame is connected, top is consolidated with being connected in the second the second spool stretching on frame with being connected in
Even, a pair magnetic stripe be placed in curtain and the first spool or the second spool be connected beyond edge, framework and curtain between and respectively with
Framework and curtain are connected.
2. luffing framework projection screen the most in length and breadth as claimed in claim 1, is characterized in that: described first frame that stretches includes that first is solid
Determining frame, the first telescopic frame and luffing push-pull bar, described first fixed frame is that the inside grooved of opening, two ends are respectively fixedly connected with bearing,
First telescopic frame is rectangular tube, and the first telescopic frame is placed in one end of the first fixed frame, termination is stretched in the first fixed frame and slides
Connect, the other end of the first telescopic frame with as the second of upper side frame stretch frame termination be connected, the other end of the first fixed frame
With as the 3rd of lower frame stretch frame termination be connected, luffing push-pull bar is built in the first fixed frame, luffing push-pull bar
One end and the first fixed frame are connected, the other end is connected with the first telescopic frame, and the first the first fixed frame stretching frame is distinguished downwards
As left and right side frame.
3. luffing framework projection screen in length and breadth as claimed in claim 1, is characterized in that: described second structure stretching frame is:
It includes that the second fixed frame, the second telescopic frame, the 3rd telescopic frame and luffing push-pull bar, described second fixed frame are that opening is inside
Grooved, two ends are respectively fixedly connected with bearing, and the second telescopic frame is rectangular tube, and the second telescopic frame is placed in one end of the second fixed frame, termination
Stretch in the second fixed frame and be slidably connected, the other end of the second telescopic frame and the first telescopic frame end of one first frame that stretches
Head is connected；3rd telescopic frame is rectangular tube, and the 3rd telescopic frame is placed in the other end of the second fixed frame, the second fixed frame is stretched in termination
In and be slidably connected, stretch the first telescopic frame termination of frame of the other end of the 3rd telescopic frame and another root first is connected, two
Luffing push-pull bar is built in two ends in the second fixed frame respectively, and one end of each luffing push-pull bar and the second fixed frame are connected, separately
One end is connected with the second telescopic frame or the 3rd telescopic frame, and a pair magnetic stripe is respectively placed on the second telescopic frame or the 3rd telescopic frame and curtain
Cloth correspondence position is also connected.
4. luffing framework projection screen in length and breadth as claimed in claim 1, is characterized in that: described 3rd structure stretching frame is:
It includes that the second fixed frame, the second telescopic frame, the 3rd telescopic frame and luffing push-pull bar, described second fixed frame are that opening is inside
Grooved, the second telescopic frame is rectangular tube, and the second telescopic frame is placed in one end of the second fixed frame, termination is stretched in the second fixed frame also
Being slidably connected, the first telescopic frame termination of the other end of the second telescopic frame and one first frame that stretches is connected；3rd telescopic frame
For rectangular tube, the 3rd telescopic frame is placed in the other end of the second fixed frame, termination is stretched in the second fixed frame and is slidably connected, and the 3rd
Stretch the first telescopic frame termination of frame of the other end of telescopic frame and another root first is connected, and two luffing push-pull bars are the most built-in
Two ends in the second fixed frame, one end of each luffing push-pull bar and the second fixed frame are connected, the other end and the second telescopic frame or
3rd telescopic frame is connected, and a pair magnetic stripe is respectively placed on the second telescopic frame or the 3rd telescopic frame and curtain correspondence position being connected.
5. the framework projection screen of luffing in length and breadth as described in Claims 1 to 4 is arbitrary, is characterized in that: described first fixed frame or
Also set up in two fixed frames to also set up outside anticreep slide block, the first telescopic frame or the second telescopic frame or the 3rd telescopic frame and fix with second
The anticreep chute that frame slide block is corresponding, anticreep slide block is slidably connected with anticreep chute.
6. luffing framework projection screen in length and breadth as claimed in claim 1, is characterized in that: described magnetic stripe is that several are arranged successively
Magnetic piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410736376.9A CN104360576B (en) | 2014-12-08 | 2014-12-08 | Luffing framework projection screen in length and breadth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410736376.9A CN104360576B (en) | 2014-12-08 | 2014-12-08 | Luffing framework projection screen in length and breadth |
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| Publication Number | Publication Date |
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| CN104360576A CN104360576A (en) | 2015-02-18 |
| CN104360576B true CN104360576B (en) | 2017-01-04 |
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| CN201410736376.9A Active CN104360576B (en) | 2014-12-08 | 2014-12-08 | Luffing framework projection screen in length and breadth |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016091118A1 (en) * | 2014-12-08 | 2016-06-16 | 窦志刚 | Variable-amplitude frame projection screen |
| CN109168275B (en) * | 2018-08-10 | 2020-05-29 | 京东方科技集团股份有限公司 | Frame device and control method thereof |
| CN111050147A (en) * | 2018-10-11 | 2020-04-21 | 上海云绅智能科技有限公司 | Projection method and system based on five-fold screen field and five-fold screen field |
| CN110275383A (en) * | 2019-07-01 | 2019-09-24 | 重庆长教科技有限公司 | Projection screen and its optical projection system for multimedia teaching |
| CN110777986B (en) * | 2019-10-21 | 2021-04-23 | 南宁职业技术学院 | Assembly type combined frame of decorative component and mounting method thereof |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5523880A (en) * | 1994-07-27 | 1996-06-04 | Draper Shade & Screen Co., Inc. | Projection screen masking system |
| JP3385207B2 (en) * | 1997-09-05 | 2003-03-10 | 泉株式会社 | Portable screen |
| JP2005221609A (en) * | 2004-02-04 | 2005-08-18 | Seiko Epson Corp | Portable screen |
| JP2006346267A (en) * | 2005-06-17 | 2006-12-28 | Kenwood Corp | Elevating attach and detach device and wall surface installation elevating attach and detach apparatus |
| CN2849795Y (en) * | 2005-11-09 | 2006-12-20 | 鸿富锦精密工业（深圳）有限公司 | Projection type electronic display |
| NL1033809C2 (en) * | 2007-05-04 | 2008-11-06 | Nedap Nv | Foldable mini projector e.g. liquid crystal on silicon (LCoS) chip type projector for use with general packet radio service phone, has pirn in which fabric display screen is rolled in horizontal and vertical directions |
| 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 |
| CN201749287U (en) * | 2010-06-01 | 2011-02-16 | 广州美视晶莹银幕有限公司 | Screen with variable-proportion frame |
| CN202472229U (en) * | 2012-03-07 | 2012-10-03 | 极品影视设备科技(深圳)有限公司 | Variable-ratio frame type projection screen |
| CN204241825U (en) * | 2014-12-08 | 2015-04-01 | 窦志刚 | Luffing framework projection screen in length and breadth |
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