CN102289335A - Electromagnetic type electronic whiteboard and assembling method thereof - Google Patents
Electromagnetic type electronic whiteboard and assembling method thereof Download PDFInfo
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- CN102289335A CN102289335A CN2011102734650A CN201110273465A CN102289335A CN 102289335 A CN102289335 A CN 102289335A CN 2011102734650 A CN2011102734650 A CN 2011102734650A CN 201110273465 A CN201110273465 A CN 201110273465A CN 102289335 A CN102289335 A CN 102289335A
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Abstract
The invention discloses an electromagnetic type electronic whiteboard and an assembling method thereof. The electromagnetic type electronic whiteboard consists of a frame (1) and a board body (2). The frame (1) is sheathed at the outer edge of the board body (2); the board body (2) comprises a backboard (7) as well as a shielding layer (6), a supporting layer (5), a sensing layer (4) and a writing layer (3), wherein the shielding layer (6), the supporting layer (5), the sensing layer (4) and the writing layer (3) are paved on the backboard (7) from inside to outside in sequence. The backboard (7) is formed by splicing a plurality of buckling boards (17) and hasp structures are formed on at least one side edge of the buckling boards (17). By means of the electromagnetic type electronic whiteboard, the deformation problem of the board bodies of multilayer composite adhesion type whiteboards is well solved through adopting a mechanical assembling structure in which a novel PVC (Polyvinyl Chloride) buckling board material and an aluminum alloy frame are combined. As the disassembling is feasible, the whiteboard can be conveniently and timely disassembled for maintenance after the whiteboard has faults and the maintenance cost is greatly reduced.
Description
Technical field
The present invention relates to a kind of assembly structure and method of electromagnetic-type electronic blank, relate in particular to that a kind of production process is simple, cost is low, indeformable, environmental protection, electromagnetic-type electronic blank and the assembly method thereof that can produce in enormous quantities.
Background technology
Electronic whiteboard be a kind of can be with the trace information of writing on hand-written surface, be converted to the device of electric signal as literal or picture.These electric signal via Computer Processing after, can finish trace information editor, storage, remote transmission, duplicate, printing etc.
Along with the continuous development of electronic technology, electronic whiteboard is applied in classroom instruction and the panel discussion gradually, and it has increased the efficient of classroom instruction and panel discussion greatly.The electromagnetic-type electronic blank is one of electronic whiteboard the most commonly used at present, comprising electric and two aspects of physical construction.Classify from the physical construction of assembling, the main product of Shi Yonging can be divided into MULTILAYER COMPOSITE bonded type and non-MULTILAYER COMPOSITE bonded type again in the market.
But, there are problems in the blank of existing MULTILAYER COMPOSITE bonded type structure, as: the blank of this form is the plate body that is become an integral body by multiple material compound sticking mostly, but because the expansion and contraction difference of various materials under different temperatures, often cause blank to produce distortion, be difficult to the flatness of better controlled blank.Along with the continuous increase of blank size in the practical application and popularizing of short out-of-focus projection instrument, in order to guarantee the display resolution of whole blank, requirement for the blank flatness is just more and more higher, has so highlighted the problem on deformation that MULTILAYER COMPOSITE bonded type structure blank exists more.Particularly for large-sized blank, problem on deformation has become the bottleneck of its development, has greatly limited the marketing of large scale blank.
In addition, the blank of MULTILAYER COMPOSITE bonded type structure is because plate body has been become an integral body by bonding, so when plate body breaks down, dismounting is very inconvenient, is difficult to keep in repair.
Summary of the invention
The object of the present invention is to provide a kind of electromagnetic-type electronic blank and assembly method, the problem on deformation that exists with practical solution MULTILAYER COMPOSITE bonded type blank.
For achieving the above object, the present invention adopts following technical scheme:
Electromagnetic-type electronic blank of the present invention is made up of frame and plate body, and frame is sleeved on the outer of plate body, and plate body comprises backboard and is laid on screen layer, supporting layer, inductive layer, writing layer on the backboard from inside to outside successively.Backboard is spliced by the polylith buckle, be formed with the hasp of at least one protrusion and/or the hasp that at least one is recessed at least one side of buckle, and, corresponding at least one the recessed hasp and/or the hasp of protrusion of forming of adjacent buckle, hasp that protrudes on the adjacent buckle and recessed hasp constitute splicing construction.
An embodiment of hasp structure is: the hasp that buckle is recessed on is a groove, and groove is to be made of the space between last groove arm that protrudes from buckle and the following groove arm, and the hasp of protrusion is a tenon.The head rectangular shaped of tenon, the tenon head is inserted to inside grooves, and the upper surface of tenon joins with the last groove arm of groove and cooperates, and the lower surface of tenon joins with the following groove arm of groove and cooperates.
Another embodiment of hasp structure is: the hasp that buckle is recessed on is a groove, and groove is to be made of the space between last groove arm that protrudes from buckle and the following groove arm, and the hasp of protrusion is a tenon.The inside of tenon is hollow structure, take the shape of the letter U shape and be inserted to inside grooves of the head of tenon, and the upper surface of tenon joins with the last groove arm of groove and cooperates, and the lower surface of tenon joins with the following groove arm of groove and cooperates.The last groove brachium of groove is in following groove arm, and the inside of following groove arm is hollow structure.
In addition, frame constitutes by upper side frame, left frame, lower frame and left frame are end to end successively, and on top frame, left frame, lower frame and left frame junction separately is provided with fixedly corner, also is provided with the wall hanging bar on the frame.Screen layer, supporting layer and inductive layer are fixed on the backboard by a plurality of self-tapping screws, and writing layer is by being fixed on the outside of inductive layer with the sticking mode of self-tapping screw point.Screen layer is preferably used aluminium foil, also can adopt other conductive metal films or conductive coating, supporting layer is made by extruded sheet, KT plate or cystosepiment, and inductive layer is made up of emitting antenna, receiving antenna, and the coiling on special machine frame of emitting antenna and receiving antenna forms.
The assembly method of electromagnetic-type electronic blank of the present invention comprises the following steps:
Polylith PVC buckle is spliced into backboard by size;
Paste aluminium foil in the front of backboard, form screen layer, paste supporting layer gluing on the backboard of screen layer;
On supporting layer, paste emission, receiving antenna, form inductive layer;
Permeable nonwoven fabrics is covered on the coil of emission, receiving antenna, and carry out compacting, brush coating on permeable nonwoven fabrics, fixed transmission, receiving antenna;
(the neutral gear place of emission, receiving antenna coil) is screwed into self-tapping screw in permeable nonwoven surface;
Use glass cement on self-tapping screw, to carry out a glue, and writing layer is sticked on the self-tapping screw;
The each several part of aluminum alloy frame is installed in order successively the outer of plate body.
The mechanical package assembly of the present invention by adopting novel PVC buckle material to combine with aluminum alloy frame well solved the problem on deformation that MULTILAYER COMPOSITE bonded type blank plate body exists.And,, greatly reduced maintenance cost so after blank goes wrong, can make things convenient for, timely blank is carried out the dismounting maintenance because assembling mode can carry out dismounting.Simultaneously, the present invention can also simplify the production process and the operating performance of blank, reduces the cost of manufacture of blank, increases the productivity effect of product.
Description of drawings
Fig. 1 is the structural representation of a kind of electromagnetic-type electronic blank of the present invention;
Fig. 2 is the cut-open view of a kind of electromagnetic-type electronic blank plate body of the present invention;
Fig. 3 is PVC buckle assembled sectional view among the present invention;
Fig. 4 makes up the cut-open view of another kind of embodiment for PVC buckle among the present invention;
Fig. 5 is the border structure synoptic diagram of a kind of electromagnetic-type electronic blank of the present invention;
Fig. 6 is the assembly flow charts of a kind of electromagnetic-type electronic blank of the present invention.
Embodiment
In order better to understand purpose of the present invention, structure and function,, the assembly structure and the method for a kind of electromagnetic-type electronic blank of the present invention are done further detailed description below in conjunction with accompanying drawing.
As depicted in figs. 1 and 2, electromagnetic-type electronic blank of the present invention mainly is made up of frame 1 and plate body 2, and frame 1 is sleeved on the outer of plate body 2.Wherein, frame 1 is made by aluminum alloy materials, and whole frame 1 is firm in structure, is the support supporting part of electromagnetic-type electronic blank.Plate body 2 is the core component of electromagnetic-type electronic blank, mainly comprises backboard 7 and is laid on screen layer 6, supporting layer 5, inductive layer 4 and writing layer 3 on the backboard 7 from inside to outside successively.
As shown in Figure 5, frame 1 mainly comprises: upper side frame 10, left frame 11, lower frame 12, left frame 13 and wall hanging bar 15.Wherein, an end of an end of upper side frame 10 and left frame 11 interconnects by being connected hinge 16.Accordingly, the other end of left frame 11 links to each other with an end of lower frame 12, the other end of lower frame 12 links to each other with an end of left frame 13, and the other end by left frame 13 is connected with the other end of upper side frame 10 and makes the whole rectangular shape that forms of frame at last, constitutes the main body frame of frame 1 thus.Those skilled in the art can be easy to expect that the junction of frame 11 and lower frame 12, lower frame 12 and left frame 13, left frame 13 and upper side frame 10 also can be provided with accordingly and be connected hinge 16 on the right.
In addition, on top the junction of frame 10 and left frame 13 also is provided with fixedly corner 14, and it is firm more, stable that fixedly corner 14 makes the connection between each frame.Accordingly, those skilled in the art can know on top that the junction of frame 10 and left frame 11, left frame 11 and lower frame 12, lower frame 12 and left frame 13 also can be provided with fixedly corner 14 by inference, makes the one-piece construction of frame 1 more firm.Also be provided with wall hanging bar 15 on frame 1, wall hanging bar 15 is mainly used in and connects support 9, uses so that the electromagnetic-type electronic blank can be placed on the support 9.
For solving the problem on deformation that MULTILAYER COMPOSITE bonded type blank exists, the present invention mainly adopts the form of splicing PVC buckle to make up the plate body part of electromagnetic-type electronic blank.As shown in Figure 3 and Figure 4, the backboard 7 of electromagnetic-type electronic blank of the present invention is spliced by polylith buckle 17, and buckle 17 can adopt the PVC material.The inside of buckle 17 is formed with some cavitys 20, and cavity 20 not only makes the weight of buckle alleviate greatly, but also helps saving material.In addition, be formed with the hasp of at least one protrusion and/or the hasp that at least one is recessed at least one side of buckle 17, and, adjacent buckle 17 corresponding at least one the recessed hasp and/or the hasps of protrusion of forming, hasp that protrudes on the adjacent buckle and recessed hasp constitute splicing construction.
The specific embodiment of hasp structure can be on the buckle 17: the hasp that buckle 17 is recessed on is a groove 18, and groove 18 is to be made of the space between last groove arm 181 that protrudes from buckle 17 and the following groove arm 182, and the hasp of protrusion is a tenon 19.Groove 18 and tenon 19 shape, size and position all suitable, by the overlap joint of adjacent buckle 17 upper grooves 18 and tenon 19, can be with buckle 17 tight combining.As shown in Figure 3, in the present embodiment, head 191 rectangular shapeds of tenon 19, and tenon head 191 is inserted to groove 18 inside.The upper surface 192 of tenon 19 joins with the last groove arm 181 of groove 18 and cooperates, and the lower surface 193 of tenon 19 joins with the following groove arm 182 of groove 18 and cooperates.The problem built on the sand that spliced buckle 17 exists at lap position can solve by using aluminum alloy frame 1 fixing mode.
Hasp structure among the present invention on the buckle 17 is not limited in the version in the foregoing description, as shown in Figure 4, among the present invention on the buckle 17 another embodiment of hasp structure be: the hasp that buckle 17 is recessed on is a groove 18 ', groove 18 ' is to be made of the space between last groove arm 181 ' that protrudes from buckle 17 and the following groove arm 182 ', and the hasp of protrusion is a tenon 19 '.The inside of tenon 19 ' is hollow structure, take the shape of the letter U shape and be inserted to groove 18 ' inside of the head 191 ' of tenon 19 ', the upper surface 192 ' of tenon 19 ' joins with the last groove arm 181 ' of groove 18 ' and cooperates, and the lower surface 193 ' of tenon 19 ' joins with the following groove arm 182 ' of groove 18 ' and cooperates.The last groove arm 181 ' of groove 18 ' is longer than down groove arm 182 ', and the inside of following groove arm 182 ' is hollow structure.The bridging arrangement of present embodiment adopts the mode of inner hollow not only to alleviate the overall weight of buckle, but also has saved the buckle material.According to actual conditions, can above-mentioned bridging arrangement be set in a side or many sides of buckle 17, so that the splicing between the buckle.
Because buckle 17 is an extrusion molding when making, thus good stable and impact resistance all had at different temperatures lower pinch plate 17, and according to actual needs, also can carry out machining on the surface of buckle 17 and install and fix operations such as confining screw.In addition, because backboard 7 is to be spliced by polylith buckle 17, so when making the electromagnetic-type electronic blank of different specification size, the number that only need splice buckle 17 by changing gets final product, and need not additionally to make the backboard mould of various sizes.Therefore, save production cost greatly, be convenient to carry out large batch of production.
As shown in Figure 2, inductive layer 4, supporting layer 5 and screen layer 6 are fixed on the backboard 7 by a plurality of self-tapping screws 8.Wherein, at first lay screen layer 6 on the backboard 7, the screen layer 6 among the present invention has formed the shielding space of a closure with frame 1 and circuit ground (scheming not shown), and passes through computing machine ground connection.This design has effectively prevented the electromagnetic interference (EMI) of extraneous generation, has improved the anti-interference of electromagnetic-type electronic blank.Make the static on the electromagnetic-type electronic blank be released rapidly by this large-area metal ground structure simultaneously, improved the antistatic effect of electromagnetic-type electronic blank.The material of screen layer 6 is preferably aluminium foil among the present invention, and according to the production actual conditions, screen layer 6 also can adopt other materials, as other conductive metal films or conductive coating etc.
Supporting layer 5 is laid on the screen layer 6, be mainly used between the inductive layer 4 that makes screen layer 6 and hereinafter will describe to maintain a certain distance, with the emission of guaranteeing signal with accept intensity, also play the effect of support simultaneously.Supporting layer 5 can be made by materials such as extruded sheet, KT plate, cystosepiments among the present invention.Inductive layer 4 is arranged on the supporting layer 5, mainly is made up of emitting antenna, receiving antenna, and emitting antenna and receiving antenna are wound on the special machine frame in advance by craft or machine.
Writing layer 3 is fixed on the outside of inductive layer 4 by putting sticking mode, and the writing layer 3 among the present invention can adopt the common panel that uses in the existing electromagnetic-type electronic blank.Different with the fixed form of writing layer in the MULTILAYER COMPOSITE bonded type blank, use fixedly writing layer 3 of the sticking mode of glass cement point among the present invention.This fixed form is not owing to carry out the complete bonding compound of whole surface, so when writing layer 3 is stretched by temperature variation, backboard 7 can be relatedly do not had influence on, the bulk deformation situation that whole electromagnetic-type electronic blank is brought because of each several part material dilatation coefficient difference can be effectively solved.
Simultaneously,, writing layer 3 is connected, so can be effectively that writing layer 3 is fixing because of forming multiple spot by self-tapping screw 8 with backboard 7.Remove writing layer 3 when needs and keep in repair when waiting other operations, adopt the sticking connected mode of glass cement point easier to remove among the present invention, and can not damage writing layer 3 following emitting antenna, receiving antenna, greatly reduce maintenance difficulty and cost.
With reference to Fig. 6, the concrete assembly method of electromagnetic-type electronic blank of the present invention is as follows:
Step 1: the mutual clamping of the hasp that is recessed on by adjacent buckle 17 and the hasp of protrusion is spliced into backboard 7 with polylith PVC buckle 17 by size.
Step 2:, form screen layer 6 pasting aluminium foil by the front of the good backboard 7 of buckle 17 splicings.Make aluminium foil, frame 1 and circuit ground (scheming not shown) form the shielding space of a closure, and pass through computing machine ground connection.
Step 3: on the backboard 7 that glues screen layer 6, paste supporting layer 5.The adhesives that uses can be double-sided adhesive paper or bonding agent etc.
Step 4: emission, receiving antenna that coiling in advance is good are adhesively fixed on the supporting layer 5.In order to guarantee the positional precision after the good emission of coiling, receiving antenna are pasted, at first on supporting layer 5, paste one deck double-sided adhesive paper, and take release liners off.Then, coiling is good emission, receiving antenna place on the supporting layer 5 that is stained with double-sided adhesive paper according to positioning requirements.The also available brush coating technology generations of the double-sided adhesive paper that uses in this step is replaced.
Step 5: covering on the coil of emission, receiving antenna with the permeable nonwoven fabrics of the identical size of area coil of emission, receiving antenna, and with permeable nonwoven fabrics and previous step the double-sided adhesive letterweight in rapid is real.Compacting process should carry out in the coil vertical direction of emission, receiving antenna, in case the principal vertical line circle is mobile.After permeable nonwoven fabrics and double-sided adhesive letterweight were real, emission, receiving antenna were tentatively fixed.The permeable nonwoven fabrics that uses in this step can be materials such as gauze or plastic wire.
Step 6: brush coating on permeable nonwoven fabrics, fixed transmission, receiving antenna.After preliminary fixing emission, receiving antenna handle through brush coating in rapid by previous step, make permeable nonwoven fabrics and emission, receiving antenna and firm entity of double-sided adhesive formation again, thereby play the purpose of fixed transmission, receiving antenna.The glue that uses in this step can adopt bonding agents such as latex, hot melt adhesive, foamed glue.
Step 7: self-tapping screw 8 and writing layer 3 are installed.Can be connected to form an integral body with backboard 7 after writing layer 3 is installed, need be screwed into self-tapping screw 8 at permeable nonwoven surface (the neutral gear place of emission, receiving antenna coil), self-tapping screw 8 will go deep into the inside of backboard 7.Then, use glass cement to carry out a glue on self-tapping screw 8, and writing layer 3 is sticked on emission, the receiving antenna surface, compacting writing layer 3 treats that glass cement solidifies.
Step 8: aluminum alloy frame 1 is installed.After plate body 2 assemblings of electromagnetic-type electronic blank are finished, the each several part of aluminum alloy frame 1 is installed in order successively the outer of plate body 2.After assembling finishes, plate body 2 is fixed on the frame 1 by the self-tapping screw on the frame 18.
The present invention has well overcome the plate body problem on deformation that MULTILAYER COMPOSITE bonded type blank exists by the structure that adopts the sticking writing layer of aluminum alloy frame, the clamping of PVC buckle and glass cement point.In addition, the material that electromagnetic-type electronic blank of the present invention is adopted is the versatile material of selling on the market, and it is low to have a cost, and the simple feature of manufacture craft is convenient to industrial production in enormous quantities.
More than by specific embodiment the present invention is further described; but it should be understood that; here concrete description; should not be construed as qualification to the spirit and scope of the invention; the various modifications that the one of ordinary skilled in the art makes the foregoing description after reading this instructions, the scope that all belongs to the present invention and protected.
Claims (12)
1. electromagnetic-type electronic blank, form by frame (1) and plate body (2), frame (1) is sleeved on the outer of plate body (2), plate body (2) comprises backboard (7) and is laid on screen layer (6) supporting layer (5) on the backboard (7) successively, inductive layer (4), writing layer (3), it is characterized in that, backboard (6) is spliced by polylith buckle (17), be formed with the hasp of at least one protrusion and/or the hasp that at least one is recessed at least one side of buckle (17), and, corresponding at least one the recessed hasp and/or the hasp of protrusion of forming of adjacent buckle (17), hasp that protrudes on the adjacent buckle and recessed hasp constitute splicing construction.
2. electromagnetic-type electronic blank according to claim 1, it is characterized in that, the hasp that buckle (17) is recessed on is groove (18), groove (18) is to be made of the space between last groove arm (181) that protrudes from buckle (17) and the following groove arm (182), the hasp that protrudes is tenon (19), head (191) rectangular shaped of tenon (19), tenon head (191) is inserted to groove (18) inside, the upper surface (192) of tenon (19) joins with the last groove arm (181) of groove (18) and cooperates, and the lower surface (193) of tenon (19) joins with the following groove arm (182) of groove (18) and cooperates.
3. electromagnetic-type electronic blank according to claim 1, it is characterized in that, the hasp that buckle (17) is recessed on is a groove (18 '), groove (18 ') is to be made of last groove arm (181 ') that protrudes from buckle (17) and the space between the following groove arm (182 '), the hasp that protrudes is a tenon (19 '), the inside of tenon (19 ') is hollow structure, take the shape of the letter U shape and be inserted to groove (18 ') inside of the head (191 ') of tenon (19 '), the upper surface (192 ') of tenon (19 ') joins with the last groove arm (181 ') of groove (18 ') and cooperates, the lower surface (193 ') of tenon (19 ') joins with the following groove arm (182 ') of groove (18 ') and cooperates, the last groove arm (181 ') of groove (18 ') is longer than down groove arm (182 '), and the inside of following groove arm (182 ') is hollow structure.
4. electromagnetic-type electronic blank according to claim 1 is characterized in that, screen layer (6), supporting layer (5) and inductive layer (4) are fixed on the backboard (7) by a plurality of self-tapping screws (8).
5. according to the described electromagnetic-type electronic blank of claim 1-4, it is characterized in that buckle (17) is made by the PVC material.
6. the electromagnetic-type electronic blank is according to each described electromagnetic-type electronic blank of claim 1-4, it is characterized in that, frame (1) is by upper side frame (10), left frame (11), lower frame (12) and the end to end successively formation of left frame (13), on top frame (10), left frame (11), lower frame (12) and left frame (13) junction separately are provided with fixedly corner (14), also are provided with wall hanging bar (15) on the frame (1).
7. according to each described electromagnetic-type electronic blank of claim 1-4, it is characterized in that frame (1) is made by aluminium alloy, upper side frame (10), left frame (11), lower frame (12) and left frame (13) head and the tail successively join by being connected hinge (16).
8. electromagnetic-type electronic blank according to claim 5 is characterized in that, writing layer (3) is by being fixed on the outside of inductive layer (4) with the sticking mode of self-tapping screw (8) point.
9. electromagnetic-type electronic blank according to claim 5 is characterized in that, screen layer (6) is preferably used aluminium foil, also can adopt other conductive metal films or conductive coating.
10. electromagnetic-type electronic blank according to claim 5 is characterized in that, supporting layer (5) is made by extruded sheet, KT plate or cystosepiment.
11. electromagnetic-type electronic blank according to claim 5 is characterized in that, inductive layer (4) is made up of emitting antenna, receiving antenna and machine frame, and the coiling on special machine frame of emitting antenna and receiving antenna forms.
12. the assembly method of an electromagnetic-type electronic blank comprises the following steps:
Polylith PVC buckle (17) is spliced into backboard (7) by size;
Aluminium foil is pasted in front at backboard (7), forms screen layer (6), goes up at the backboard that glues screen layer (6) (7) and pastes supporting layer (5);
Go up stickup emission, receiving antenna at supporting layer (5), form inductive layer (4);
Permeable nonwoven fabrics is covered on the coil of emission, receiving antenna, and carry out compacting, brush coating on permeable nonwoven fabrics, fixed transmission, receiving antenna;
Be screwed into self-tapping screw (8) in permeable nonwoven surface;
Use glass cement on self-tapping screw (8), to carry out a glue, and writing layer (3) is sticked on the self-tapping screw (8);
The each several part of aluminum alloy frame (1) is installed in order successively the outer of plate body (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102734650A CN102289335A (en) | 2011-09-15 | 2011-09-15 | Electromagnetic type electronic whiteboard and assembling method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102734650A CN102289335A (en) | 2011-09-15 | 2011-09-15 | Electromagnetic type electronic whiteboard and assembling method thereof |
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| CN102289335A true CN102289335A (en) | 2011-12-21 |
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| CN2011102734650A Pending CN102289335A (en) | 2011-09-15 | 2011-09-15 | Electromagnetic type electronic whiteboard and assembling method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114690528A (en) * | 2022-04-07 | 2022-07-01 | 深圳市海视源科技有限公司 | Double-layer electronic writing screen and installation method |
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| US20050052424A1 (en) * | 2001-12-29 | 2005-03-10 | Hsua-Ming Shih | Electromagnetic induction electronic board with antenna arrayed in gridding inside |
| CN201086534Y (en) * | 2007-06-28 | 2008-07-16 | 李妙香 | Environment friendly durable writing board |
| CN201552784U (en) * | 2009-12-08 | 2010-08-18 | 厦门日学文教用品有限公司 | Pressing and folding resistant white board |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050052424A1 (en) * | 2001-12-29 | 2005-03-10 | Hsua-Ming Shih | Electromagnetic induction electronic board with antenna arrayed in gridding inside |
| CN1409264A (en) * | 2002-09-17 | 2003-04-09 | 台均实业有限公司 | Electronic white plate with built-in membrane antenna array network electromagnetic inductive layer |
| CN201086534Y (en) * | 2007-06-28 | 2008-07-16 | 李妙香 | Environment friendly durable writing board |
| CN201552784U (en) * | 2009-12-08 | 2010-08-18 | 厦门日学文教用品有限公司 | Pressing and folding resistant white board |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114690528A (en) * | 2022-04-07 | 2022-07-01 | 深圳市海视源科技有限公司 | Double-layer electronic writing screen and installation method |
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Application publication date: 20111221 |