CN108469713A - A kind of concealed projection arrangement for publicity - Google Patents
A kind of concealed projection arrangement for publicity Download PDFInfo
- Publication number
- CN108469713A CN108469713A CN201810260247.5A CN201810260247A CN108469713A CN 108469713 A CN108469713 A CN 108469713A CN 201810260247 A CN201810260247 A CN 201810260247A CN 108469713 A CN108469713 A CN 108469713A
- Authority
- CN
- China
- Prior art keywords
- roof
- projection screen
- projection
- concealed
- support bar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001737 promoting effect Effects 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims description 13
- 238000004804 winding Methods 0.000 claims description 12
- 238000009423 ventilation Methods 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/20—Undercarriages with or without wheels
- F16M11/24—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other
-
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
The invention discloses a kind of concealed projection arrangements for publicity, including projector, projection screen, hoisting mechanism for promoting projection screen is installed, hoisting mechanism includes mounting rod, the lifting member for promoting mounting rod, lifting member includes being mounted on chain on turning gear of the lifting frame at the billboard back side, the turning gear being rotatably connected in lifting frame, coiling, the driving motor being fixedly connected on roof, and mounting rod both ends are mounted on chain；Collecting mechanism is equipped on roof, pass through projector, driving motor drives turning gear rotation, turning gear passes through chain-driving mounting rod rise and fall, the lifting of projection screen is controlled by mounting rod, the curtain after decline is collected by collecting mechanism, setting in this way, hoisting mechanism is arranged behind roof billboard, projection screen can be accepted when without using projection screen, setting in this way, pedestrian is when watching projection, it not can be appreciated that curtain, improve the comfort level of pedestrian's viewing.
Description
Technical field
The present invention relates to projection devices, and in particular to a kind of concealed projection arrangement for publicity.
Background technology
Projection refers to that the shape of object is projected a plane up with one group of light, referred to as " projects ".It is flat at this
The image obtained on face also referred to as " projects ".Projection can be divided into orthographic projection and oblique projection.Orthographic projection is the center line of the incident line
Perpendicular to the plane of projection, center of projection line is not orthogonal to the referred to as oblique projection of projection plane.
Some existing projection devices can be used as a kind of publicity mode, some general existing advertising methods make
When with projection, tends not to appear on publicity picture in view of projection device, cause the people of viewing that can not see publicity
Content.
Invention content
In view of the deficiencies of the prior art, the present invention intends to provide a kind of concealed projection dress for publicity
It sets.
To achieve the above object, the present invention provides following technical solutions：
A kind of concealed projection arrangement for publicity includes the projector on roof, is mounted on roof billboard and carries on the back
Projection screen on face is arranged in hollow mesh on the projection screen, and one is equipped between the projection screen and billboard
Hoisting mechanism for promoting projection screen, the hoisting mechanism include for installing the mounting rod of projection screen, for being promoted
The lifting member of mounting rod, the lifting member include the lifting frame being mounted on the billboard back side, are rotatably connected in lifting frame
Chain on two groups of turning gears of two groups of turning gears, coiling is fixedly connected on the driving for driving turning gear to rotate on roof
Motor, the mounting rod both ends are mounted on chain；A collecting mechanism for collecting projection screen is equipped on the roof.
By using above-mentioned technical proposal, by installing projector on roof, turning gear is driven to turn by driving motor
Dynamic, turning gear controls the lifting of projection screen by the rise and fall of mounting rod by chain-driving mounting rod rise and fall,
The curtain after decline is collected by collecting mechanism, setting in this way, hoisting mechanism is arranged in roof billboard
Below, projection screen can be accepted when without using projection screen, it, can be by hoisting mechanism by curtain when using projecting
Cloth rises to be projected, and setting in this way, pedestrian not can be appreciated that curtain when watching projection, improves pedestrian's sight
The comfort level seen.
The further setting of the present invention is：The collecting mechanism includes the collection frame being mounted on roof, in the collection
Frame is equipped with the rolling-up mechanism for facilitating winding projection screen.
By using above-mentioned technical proposal, it is collected into collection frame by the projection screen that rolling-up mechanism lowers by under,
Setting in this way facilitates the collection to curtain, improves the service life of curtain.
The further setting of the present invention is：The rolling-up mechanism includes being rotatably connected between the side wall of the collection frame both ends
Wind-up roll, be fixedly connected on the winding motor for driving wind-up roll to rotate in collection frame.
By using above-mentioned technical proposal, wind-up roll rotation, the throwing that wind-up roll lowers by under are driven by winding motor
In the winding to wind-up roll of shadow curtain, setting in this way will be in projection screen winding to wind-up roll, it is therefore prevented that projection screen exists
Occur to fold in collection frame to lead to have folding line on projection screen, influences the service life of projection screen.
The further setting of the present invention is：It is rotatably connected to end cap in the collection frame upper end, is set in the collection frame
There is a keying cylinder for opening and closing end cap, the both ends for opening and closing cylinder are rotatably connected on respectively on collection frame inner wall and end cap
On lower surface.
By using above-mentioned technical proposal, the keying of end cap, setting in this way is driven to be not required to by opening and closing cylinder
When using projection screen, projection screen is placed in collection frame, is later closed collection frame by end cap, is prevented rainwater
Projection screen is caused to damage.
The further setting of the present invention is：A bindiny mechanism, the connection machine are equipped between the projector and roof
Structure includes the second support of two groups of first support bars being fixedly connected on roof, the inner hollow being fixedly connected on roof
Bar, the sliding groove being opened on projector lower surface, is arranged second the third supporting rod being slidably connected in second support bar
The locking member of supporting rod and third supporting rod is rotatably connected in the projector on the one end of first support bar far from roof,
Third supporting rod one end is slidably connected in sliding groove.
It is solid by locking member by adjusting position of the third supporting rod in sliding groove by using above-mentioned technical proposal
Determine position of the third supporting rod in second support bar, setting in this way can adjust the projection angle of projector.
The further setting of the present invention is：The locking member includes the sliding slot being opened on second support bar side wall, sliding
The ball that is connected in sliding slot, the lock sleeve being slidably connected in second support bar, be respectively fixedly connected in lock sleeve inner wall and
Internal thread on second support bar outer wall and external screw thread.
By using above-mentioned technical proposal, drives ball to be pushed against in second support bar by lock sleeve, pass through internal thread
The position of lock sleeve is fixed with externally threaded cooperation, setting in this way facilitates the fixation to third supporting rod, structure
Simply, easy to operate.
The further setting of the present invention is：It is fixedly connected on the lock sleeve inner wall and is useful for facilitating driving ball to push against
Wedge block on third supporting rod.
By using above-mentioned technical proposal, by being fixedly connected with wedge block on lock sleeve inner wall, setting in this way
It sets, facilitates the driving to ball.
The further setting of the present invention is：It is rotatably connected to a rolling on the one end of the third supporting rod close to sliding groove
Wheel.
By using above-mentioned technical proposal, by being rotatably connected to a rolling close to one end of sliding groove in third supporting rod
Wheel, setting in this way reduce the friction of third supporting rod and sliding groove holder, facilitate the tune to projector's angle
Section.
The further setting of the present invention is：It is equipped with a protective cover around the projecting apparatus, is opened up on the protective cover
There is the through-hole for facilitating projection.
By using above-mentioned technical proposal, by being equipped with a protective cover on projecting apparatus, setting in this way facilitates
Protection to projecting apparatus will not cause to damage in unexpected rain to projecting apparatus.
The further setting of the present invention is：A ventilation opening is offered on the protective cover side wall and bottom, described
One draft fan is installed on ventilation opening.
By using above-mentioned technical proposal, by offering a ventilation opening in protective cover bottom and side wall, divulging information
Draft fan is installed on mouthful, setting in this way is convenient to radiate to protective cover inside, prevents heat too high to projecting apparatus
It causes to damage.
The present invention has the following advantages：It is collected into collection frame, is led to by the projection screen that rolling-up mechanism lowers by under
Such setting is crossed, the collection to curtain is facilitated, improves the service life of curtain；Opening for end cap is driven by opening and closing cylinder
It closes, setting in this way, when that need not use projection screen, projection screen is placed in collection frame, passes through end cap later
Collection frame is closed, prevents rainwater from causing to damage to projection screen；By adjusting position of the third supporting rod in sliding groove
It sets, position of the third supporting rod in second support bar is fixed by locking member, setting in this way can adjust projector
Projection angle.
Description of the drawings
Fig. 1 is overall structure diagram in embodiment；
Fig. 2 is the overall structure diagram between projector, projection screen in embodiment；
Fig. 3 is the overall structure diagram of projector and bindiny mechanism in embodiment；
Fig. 4 is the overall structure vertical view between second support bar, third supporting rod, locking member in embodiment
Fig. 5 is the sectional view at A-A in Fig. 4；
Fig. 6 is the enlarged drawing at B in Fig. 5；
Fig. 7 is the overall structure diagram of collecting mechanism and rolling-up mechanism in embodiment；
Fig. 8 is the overall structure diagram of protective cover in embodiment.
Reference numeral：1, projector；2, projection screen；3, hoisting mechanism；4, mounting rod；5, lifting member；6, lifting frame；7、
Turning gear；8, chain；9, driving motor；10, collecting mechanism；11, collection frame；12, rolling-up mechanism；13, wind-up roll；14, it winds
Motor；15, end cap；16, cylinder is opened and closed；17, bindiny mechanism；18, first support bar；19, second support bar；20, third supports
Bar；21, sliding groove；22, locking member；23, sliding slot；24, ball；25, lock sleeve；26, internal thread；27, external screw thread；28, wedge-shaped
Block；29, idler wheel；30, protective cover；31, through-hole；32, ventilation opening；33, draft fan.
Specific implementation mode
With reference to attached drawing, the present invention will be further described.
A kind of concealed projection arrangement for publicity, as shown in Figure 1, including the projector 1 being mounted on roof, installation
The projection screen 2 in hollow mesh setting on the roof billboard back side.
As shown in Fig. 2, being equipped with a hoisting mechanism 3 for promoting curtain, elevator between projection screen 2 and billboard
Structure 3 include for installing the mounting rod 4 of projection screen 2, the lifting member 5 for promoting mounting rod 4, lifting member 5 include be mounted on
Lifting frame 6 on the billboard back side, two groups of turning gears 7 being rotatably connected in lifting frame 6, coiling are on two groups of turning gears 7
Chain 8 is fixedly connected on the driving motor 9 for driving turning gear 7 to rotate on roof, and 4 both ends of mounting rod are mounted on chain 8
On.
As shown in fig. 7, being equipped with a collecting mechanism 10 for collecting curtain on roof, collecting mechanism 10 includes being mounted on
Collection frame 11 on roof, the rolling-up mechanism 12 for winding curtain being arranged in collection frame 11；Rolling-up mechanism 12 includes turning
The dynamic wind-up roll 13 being connected between 11 both ends side wall of collection frame is fixedly connected in collection frame 11 for driving wind-up roll 13
The winding motor 14 of rotation.
As shown in fig. 7, rainwater causes to damage to projection screen 2 in order to prevent, one is rotatably connected in 11 upper end of collection frame
End cap 15 is internally provided with a keying cylinder 16 in collection frame 11, and the both ends for opening and closing cylinder 16 are rotatably connected on collection frame 11 respectively
On 15 lower surface of inner wall and end cap.
As shown in figs. 3 and 5, a bindiny mechanism 17 is equipped between projector 1 and roof, bindiny mechanism 17 includes two groups
The second support bar 19 of the first support bar 18, the inner hollow being fixedly connected on roof that are fixedly connected on roof, sliding
The third supporting rod 20 that is connected in second support bar 19, is arranged second the sliding groove 21 being opened on 1 lower surface of projector
The locking member 22 of supporting rod 19 and third supporting rod 20 is rotatably connected on one of first support bar 18 far from roof in projector 1
On end, 20 one end of third supporting rod is slidably connected in sliding groove 21.
As shown in figs. 3 and 5, locking member 22 includes the sliding slot 23 being opened on 19 side wall of second support bar, is slidably connected at
Ball 24 in sliding slot 23, is respectively fixedly connected in lock sleeve 25 lock sleeve 25 being slidably connected in second support bar 19
Internal thread 26 on 19 outer wall of wall and second support bar and external screw thread 27.
As shown in fig. 6, lock sleeve 25 drives ball 24 to be pushed against on third supporting rod 20 for convenience, in lock sleeve 25
A wedge block 28 is fixedly connected on wall.
As shown in figure 3, in order to reduce the friction between third supporting rod 20 and sliding groove 21, in 20 one end of third supporting rod
On be rotatably connected to an idler wheel 29.
As shown in Fig. 1, Fig. 8, projecting apparatus 1 is protected for convenience, a protective cover 30 is equipped on projecting apparatus 1,
A through-hole 31 for facilitating projection is offered on 30 side wall of protective cover, and ventilation is offered on 30 side wall of protective cover and bottom
Mouth 32, is mounted on draft fan 33 on ventilation opening 32.
Operation principle：When needing using projection, start and open and close cylinder 16, open end cap 15, starts driving motor 9, driving
Motor 9 drives turning gear 7 to rotate, and turning gear 7 drives mounting rod 4 to rise by chain 8, and winding motor 14 drives 13 turns of wind-up roll
Dynamic, the rising of mounting rod 4 drives projection screen 2 to rise, and according to the position of projection screen 2, adjusts the projection angle of projector 1,
Unscrew lock sleeve 25, lock sleeve is tightened in position of the adjustment third supporting rod 20 in second support bar 19 after adjusting good position
25。
When projection need not be used, start driving motor 9, driving motor 9 drives turning gear 7 to rotate, and turning gear 7 passes through
Mounting rod 4 is driven to decline, mounting rod 4 drives projection screen 2 to decline, and winding motor 14 drives wind-up roll 13 to rotate, by projection screen
In the winding to wind-up roll 13 of cloth 2, after having wound, opens and closes cylinder 16 and cover end cap 15.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of concealed projection arrangement for publicity includes the projector on roof（1）, it is mounted on roof advertisement
Projection screen on the board back side（2）, the projection screen（2）It is upper to be arranged in hollow mesh, it is characterised in that：In the projection screen
Cloth（2）One is equipped between billboard for promoting projection screen（2）Hoisting mechanism（3）, the hoisting mechanism（3）Including with
In installation projection screen（2）Mounting rod（4）, for promoting mounting rod（4）Lifting member（5）, the lifting member（5）Including peace
Lifting frame on the billboard back side（6）, be rotatably connected on lifting frame（6）Two groups of interior turning gears（7）, coiling at two groups turn
Moving teeth（7）On chain（8）, be fixedly connected on roof for driving turning gear（7）The driving motor of rotation（9）, the peace
Fill bar（4）Both ends are mounted on chain（8）On；One is equipped on the roof for collecting projection screen（2）Collecting mechanism
（10）.
2. a kind of concealed projection arrangement for publicity according to claim 1, it is characterised in that：The collecting mechanism
（10）It include the collection frame on roof（11）, in the collection frame（11）It is equipped with for facilitating winding projection screen
（2）Rolling-up mechanism（12）.
3. a kind of concealed projection arrangement for publicity according to claim 2, it is characterised in that：The rolling-up mechanism
（12）Including being rotatably connected on the collection frame（11）Wind-up roll between the side wall of both ends（13）, be fixedly connected on collection frame
（11）It is interior to be used to drive wind-up roll（13）The winding motor of rotation（14）.
4. a kind of concealed projection arrangement for publicity according to claim 3, it is characterised in that：In the collection frame
（11）Upper end is rotatably connected to end cap（15）, in the collection frame（11）One is equipped with for opening and closing end cap（15）Keying cylinder
（16）, the keying cylinder（16）Both ends be rotatably connected on collection frame respectively（11）On inner wall and end cap（15）On lower surface.
5. a kind of concealed projection arrangement for publicity according to claim 1, it is characterised in that：In the projector
（1）A bindiny mechanism is equipped between roof（17）, the bindiny mechanism（17）Including two groups be fixedly connected on roof
One supporting rod（18）, the second support bar of inner hollow that is fixedly connected on roof（19）, be slidably connected at second support bar
（19）In third supporting rod（20）, be opened in projector（1）Sliding groove on lower surface（21）, be arranged in second support bar
（19）With third supporting rod（20）Locking member（22）, in the projector（1）It is rotatably connected on first support bar（18）It is separate
On one end of roof, the third supporting rod（20）One end is slidably connected at sliding groove（21）In.
6. a kind of concealed projection arrangement for publicity according to claim 5, it is characterised in that：The locking member
（22）Including being opened in second support bar（19）Sliding slot on side wall（23）, be slidably connected at sliding slot（23）In ball（24）、
It is slidably connected at second support bar（19）On lock sleeve（25）, be respectively fixedly connected in lock sleeve（25）Inner wall and the second support
Bar（19）Internal thread on outer wall（26）And external screw thread（27）.
7. a kind of concealed projection arrangement for publicity according to claim 6, it is characterised in that：In the lock sleeve
（25）It is fixedly connected on inner wall and is useful for facilitating driving ball（24）It is pushed against third supporting rod（20）On wedge block（28）.
8. a kind of concealed projection arrangement for publicity according to claim 5, it is characterised in that：In the third branch
Strut（20）Close to sliding groove（21）One end on be rotatably connected to an idler wheel（29）.
9. a kind of concealed projection arrangement for publicity according to claim 1, it is characterised in that：In the projecting apparatus
It is equipped with a protective cover 30 around 1, the through-hole 31 for facilitating projection is offered on the protective cover 30.
10. a kind of concealed projection arrangement for publicity according to claim 9, it is characterised in that：In the protection
It covers and offers a ventilation opening 32 on 30 side walls and bottom, a draft fan 33 is installed on the ventilation opening 32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810260247.5A CN108469713A (en) | 2018-03-27 | 2018-03-27 | A kind of concealed projection arrangement for publicity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810260247.5A CN108469713A (en) | 2018-03-27 | 2018-03-27 | A kind of concealed projection arrangement for publicity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108469713A true CN108469713A (en) | 2018-08-31 |
Family
ID=63264797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810260247.5A Pending CN108469713A (en) | 2018-03-27 | 2018-03-27 | A kind of concealed projection arrangement for publicity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108469713A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2909322Y (en) * | 2006-01-26 | 2007-06-06 | 张新予 | Electric lifting device for projection screen |
| CN103676444A (en) * | 2012-09-25 | 2014-03-26 | 陈政寰 | Projection screen and projection system thereof |
| CN203995293U (en) * | 2014-07-16 | 2014-12-10 | 庞元婷 | A kind of automatic dust-reducing blackboard being used in conjunction with projection cloth |
| CN105467740A (en) * | 2015-12-15 | 2016-04-06 | 重庆触视科技有限公司 | Bottom-up projection screen |
| CN205896592U (en) * | 2016-08-24 | 2017-01-18 | 马桂英 | Multi -media adjusting device is used with automatic teaching to computer |
| CN106454296A (en) * | 2016-11-18 | 2017-02-22 | 安溪县智睿电子商务有限公司 | Portable projection device |
| CN107420390A (en) * | 2017-06-19 | 2017-12-01 | 长沙华健医疗设备有限公司 | A kind of expansion link |
-
2018
- 2018-03-27 CN CN201810260247.5A patent/CN108469713A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2909322Y (en) * | 2006-01-26 | 2007-06-06 | 张新予 | Electric lifting device for projection screen |
| CN103676444A (en) * | 2012-09-25 | 2014-03-26 | 陈政寰 | Projection screen and projection system thereof |
| CN203995293U (en) * | 2014-07-16 | 2014-12-10 | 庞元婷 | A kind of automatic dust-reducing blackboard being used in conjunction with projection cloth |
| CN105467740A (en) * | 2015-12-15 | 2016-04-06 | 重庆触视科技有限公司 | Bottom-up projection screen |
| CN205896592U (en) * | 2016-08-24 | 2017-01-18 | 马桂英 | Multi -media adjusting device is used with automatic teaching to computer |
| CN106454296A (en) * | 2016-11-18 | 2017-02-22 | 安溪县智睿电子商务有限公司 | Portable projection device |
| CN107420390A (en) * | 2017-06-19 | 2017-12-01 | 长沙华健医疗设备有限公司 | A kind of expansion link |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180831 |