WO2009090441A2 - Planche à dessin magnétique à effacement par l'avant et effaceur magnétique - Google Patents

Planche à dessin magnétique à effacement par l'avant et effaceur magnétique Download PDF

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Publication number
WO2009090441A2
WO2009090441A2 PCT/IB2007/055288 IB2007055288W WO2009090441A2 WO 2009090441 A2 WO2009090441 A2 WO 2009090441A2 IB 2007055288 W IB2007055288 W IB 2007055288W WO 2009090441 A2 WO2009090441 A2 WO 2009090441A2
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
magnet
erase
eraser
panel
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.)
Ceased
Application number
PCT/IB2007/055288
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English (en)
Other versions
WO2009090441A3 (fr
Inventor
Song Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MPOT Pte Ltd
Original Assignee
MPOT Pte Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MPOT Pte Ltd filed Critical MPOT Pte Ltd
Priority to PCT/IB2007/055288 priority Critical patent/WO2009090441A2/fr
Publication of WO2009090441A2 publication Critical patent/WO2009090441A2/fr
Publication of WO2009090441A3 publication Critical patent/WO2009090441A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
    • B43L1/008—Repeatedly-usable boards or tablets for writing or drawing with magnetic action
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L19/00—Erasers, rubbers, or erasing devices; Holders therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L19/00—Erasers, rubbers, or erasing devices; Holders therefor
    • B43L19/0043—Erasing by electronic or electrolytic means

Definitions

  • the present invention relates to an image forming and erasing apparatus and, more specifically, although of course not solely limited thereto, this invention relates to a front erase magnetic drawing board and magnetic eraser and its electronic adaptation.
  • Erasable magnetic drawing boards are alternatives to conventional erasable drawing boards. They do not require consumables and do not create pollutants in the process of using. The most common and successful erasable magnetic drawing boards are those used as children's drawing boards.
  • a magnetic pen can be applied to the front of the magnetic drawing board to create an image.
  • a magnetic strip can be used to slide behind the magnetic drawing board to erase the image. The magnetic drawing board is white while the drawing is black.
  • US Patent No. 4,143,472 is one such example.
  • the patent discloses an erasable magnetic drawing board apparatus 1, comprising a magnetic panel 2, which is made up of a plurality of honeycomb cells, each cell being filled with a masking liquid, which is usually white in color, and magnetic particles, which are usually black in color.
  • Drawing instrument such as a magnetic pen 3 is used to attract the black magnetic particles forward to reveal the black particles in the white fluid to display an image.
  • the erasing of the image is by sliding a strip of magnet 4 behind the back of the magnetic panel 2. This attracts the black magnetic material back, hiding the black particles in the white fluid.
  • the magnetic panel 2 and magnetic slider 4 are enclosed in a rectangular frame 5.
  • US Patent No. 5,972,493 discloses a microcapsule magnet sheet which can be used in place of the magnetic panel in erasable drawing boards.
  • the sheet comprises a layer of microcapsules between 400 and 800 microns, each microcapsule containing a dispersion liquid with non-magnetic white particles and black magnetic particles.
  • the advantage of using microcapsule magnet sheet as drawing panel is that it is thinner and uses less material.
  • the disadvantage is that the contrast between black and white is not as good due to its thinness.
  • the method of drawing and erasing are the same as before.
  • a magnetic pen is used to attract the black magnetic particles in the microcapsules forward to reveal the black particles to form an image.
  • a magnetic strip is used to slide behind the microcapsule magnetic sheet and attract the particles back to erase the image.
  • the microcapsule magnet display sheet comprises a layer of microcapsules, each microcapsule comprising dispersion liquid, white particles, and black magnetic particles of at least two sizes. Drawing on the microcapsule magnet display sheet is same as before. As for erasing, weak horizontal magnetic field acting on the sheet will cause the microcapsules to become white. Referring to FIG. 2, the microcapsule magnet display sheet 6 is made up of a layer of microcapsules 7. An erasing magnet 8 placed above a non-magnetic material 9 ensures that the erasing magnet 8 is at the required distance above the microcapsule magnet display sheet 6 and the magnetic field reaching the microcapsules 7 are weak.
  • the erasing magnet 8 generates magnetic field lines 10 and 11.
  • the weak horizontal magnetic field 10 acting on the microcapsule magnet display sheet 6 and microcapsules 7a will cause the microcapsules 7a there to become white, thus erasing any image there. Disclosure of Invention Technical Problem
  • the first problem with current erasable magnetic drawing board is that the erasing is by way of sliding a magnetic strip behind the magnetic panel. Such an erasing method is not localized and cannot erase only the desired area without erasing other areas. For example, if the user only wants to erase a small area in the middle of the drawing, it is not possible. The user will need to start sliding the magnetic strip from one end to the middle of the board, and erasers half the drawing before the user actually erases the part in the middle.
  • Another problem with using a magnetic slider is that such an erasing method limits the size of the drawing board. Taking into account human strength and alignment issue of magnetic slider, magnetic sliders typically are not longer than 200 mm and do not slide more than 300 mm. Similarly, the drawing area of magnetic drawing boards using magnetic sliders is typically smaller than 300 mm wide and 200 mm high. It is not practical to make a larger erasable magnetic drawing board with magnetic slider such as 2000 mm wide by 1000 mm high for meeting room or classroom as it is difficult to slide the magnetic slider behind the magnetic drawing panel and the magnetic drawing panel is too flimsy.
  • the front face erasable microcapsule magnet display sheet allows for front erasing
  • the color states of the microcapsules are very sensitive to the magnetic fields. It is a fact that magnetic field lines from a magnet are not uniformly distributed in density and direction. Referring to FIG. 2, the microcapsules 7a underneath the magnet 8 experience weak horizontal magnetic field 10 and will turn white. However, the microcapsules further out experience non-horizontal or vertical fields 11 and might turn from white to black. This is an unintended effect and might result in 'dirty' erasing, whereby the display sheet is not totally white after erasing but white with black specks.
  • microcapsule display sheet This further reduces the viewing quality of microcapsule display sheet as the contrast for microcapsule display sheet is already not as good as other magnetic panels. Even in the case of writing with a magnetic pen, the removal of the magnetic pen from the display sheet might cause some microcapsules to change from black to white because they will experience a change in the magnetic field from strong vertical magnetic fields to weak horizontal magnetic fields. While the front erasable microcapsule magnet display sheet has advantages, it suffers from other disadvantages not found in earlier magnetic display panels or microcapsule magnet sheets.
  • a new type of magnetic eraser is invented to solve the problem of non-localize erasing.
  • the new magnet eraser allows for localized and front face erasing.
  • the new magnetic eraser comprises of a magnet in front of the erasable magnetic drawing panel and a magnet behind the erasable magnetic drawing panel.
  • the front magnet can slide over the erasable magnetic drawing panel.
  • the back magnet will follow the front magnet due to the magnetic attraction between. By making the back magnet stronger or larger than the front magnet, the magnetic particles in the magnetic drawing panel will be attracted back and the drawing erased when the magnetic eraser slides over the magnetic drawing panel.
  • the flimsiness of the magnetic drawing panel can be reduced by increasing the second moment of area of the magnetic drawing panel. This can be achieved by increasing its thickness or adding stiffeners to it. The increased second moment of area of the magnetic drawing panel will help it to resist bending during drawing or erasing.
  • a layer of sensors under the magnetic drawing board can be used to detect whether each cell or zone is black or white. This information can be captured and saved to disk or processed or printed.
  • the apparatus will further need a layer of electromagnets under the magnetic drawing board and a front drawing magnet at the front of the drawing panel.
  • Each electromagnet can be turned on or off and can be used to attract the front drawing magnet. It is possible for a processor to control the sequence the electromagnets are turned on and off. In so doing, it is possible to control the movement of the front drawing magnet on top of the magnetic drawing panel using the electromagnets beneath the magnetic drawing panel. Depending on the relative strength of the electromagnet and the front drawing magnet, the path that the front drawing magnet takes on top of the magnetic drawing panel can be made to be white or black.
  • the black magnetic particles in the cell or zone in the magnetic drawing panel will be attracted forward and the cell or zone will become black. Conversely, if the magnetic strength of the front drawing magnet is weaker than the electromagnet, then the black magnetic particles in the cell or zone in the magnetic drawing panel will be attracted backward and the cell or zone will become white. A whole image can thus be drawn on the magnetic drawing panel using the electromagnets to control the front drawing magnet.
  • the erasable magnetic drawing board can save and display saved images. This greatly increases the versatility and usefulness of the erasable magnetic drawing board. Description of Drawings
  • FIG. 1 shows an example of a prior art toy erasable magnetic drawing board
  • FIG. 2 shows a partial cross sectional view of a prior art front face erasable microcapsule magnet sheet with erasing magnet
  • FIG. 3 shows a front view of an example of a front face erasable magnetic drawing board
  • FIG. 4 shows a cross sectional view 29-29 of FIG. 3
  • FIG. 5a to 5c show partial cross sectional views of various stiffeners
  • FIG. 6 shows a cross sectional view of an alternative magnetic front erase eraser
  • FIG. 7 shows a view of the electromagnet layer
  • FIG. 8 shows a cross sectional view of the front erase magnetic drawing board with electromagnet layer. Best Mode
  • FIG. 3 it shows a front view of an example of the present invention of a front erase magnetic drawing board apparatus 20.
  • the front erase magnetic drawing board 20 comprises of a magnetic drawing panel 21 enclosed within a frame 28, magnetic pen 40, and magnetic front erase eraser 30.
  • the magnetic drawing panel 21 referred here is used as a generic term to mean any erasable magnetic drawing material that allows the use of magnet to draw from the front and any magnet to erase from the back. Such magnetic drawing materials have been around and are well known in the art.
  • the magnetic drawing panel could refer to the magnetic display panel disclosed in US Patent No. 4,143,472.
  • the magnetic display panel comprises of a layer of multi-cell structure sandwiched between two substrates. Each cell is filled with masking white liquid and black or colored magnetic particles. Such magnetic display panels are about 1.5 mm to 2.0 mm thick.
  • the magnetic drawing panel 21 could also refer to the microcapsule magnet sheet disclosed in US Patent No. 5,972,493.
  • the microcapsule magnet sheet comprises a layer of microcapsule, each microcapsule being filled with white masking fluid and black magnetic particles.
  • Such microcapsule magnet sheets are about 0.4 mm to 0.8 mm thick.
  • the magnetic drawing panel 21 is also not restricted to only a single color but could also be of any color or colors.
  • the magnetic pen 40 has a magnet at the tip of a non-magnetic rod and can be used to draw lines on the magnetic drawing panel 21. In fact, any magnet can be used to draw on the magnetic drawing panel 21. These magnets used for drawing can be gen- erically termed as magnetic drawing instruments. Other examples of magnetic drawing instruments are magnetic stamp and magnetic rollers. Magnetic stamp has a flat magnetic surface of a certain shape or design, and can be stamped repeatedly on the magnetic drawing panel 21 to create same images. Magnetic roller has a roller wrapped or coated with magnetic material, and can be used to roll over the magnetic drawing panel 21 to create repeated rolling patterns. Magnetic drawing instruments are well known in the art. Markers can also be used on the magnetic drawing panel 21. Markers can provide additional drawing colors to the existing color provided by the magnetic drawing panel 21. More often than not, the use of markers will be very limited as the bulk of most drawings or writing will be of the same color.
  • the magnetic front erase eraser 30 is used to erase any image drawn on the apparatus
  • FIG. 4 shows a cross-sectional view 29-29 of FIG. 3.
  • the front erase magnetic drawing board 20 comprises the magnetic drawing panel 21, the frame 28, stiffener 22, back panel 25 and magnetic front erase eraser 30.
  • the magnetic front erase eraser 30 comprises a front magnet 31 in front of the magnetic drawing panel 21 and a back magnet 35 underneath the magnetic drawing panel 21.
  • the front magnet 31 can slide over the surface of the magnetic drawing panel 21.
  • the back magnet 35 will follow the front magnet 31 under the magnetic drawing panel 21 due to the magnetic attraction between the front magnet 31 and the back magnet 35. If the magnetic field acting on the magnetic particles in the magnetic drawing panel 21 is stronger from the back magnet 35 than the front magnet 31, then the magnetic particles will move backwards and the drawing in the path of the magnetic front erase eraser 30 will be erased.
  • the front magnet 31 further comprises a magnet holder 32 so that it is easier to hold and use.
  • the magnet can also have a layer of marker eraser 34 between the magnet and the magnetic drawing panel 21. This is useful if markers are used on the magnetic drawing panel 21 and the magnetic front erase eraser 30 can then erase both magnetic drawings and marker drawings at the same time.
  • the front magnet 31 can be soft magnets such as iron or steel or can be permanent magnets such as rubber magnet, ferrite magnet, alnico magnet or neodymium magnet.
  • the main purpose of the front magnet 31 is to attract the back magnet 35.
  • the magnet holder 32 can be made from plastic, although wood, aluminum or other materials are also acceptable as its purpose is to increase the ease of holding and use of the magnetic front erase eraser 30.
  • the layer of marker eraser 34 can be made from clothe, fabric, sponge, or any other material that can erase marker drawings.
  • the back magnet 35 can be any type of permanent magnet, such as rubber magnet, ferrite magnet, alnico magnet or neodymium magnet.
  • the back magnet 35 can further have a non-magnetic layer 36.
  • the non-magnetic layer 36 can protect the magnet 36 from frictional wear and tear.
  • the thickness of the non-magnetic layer 36 can also be varied so that the desired magnetic field reaches the magnetic drawing panel 21 and the erasing effect is optimized.
  • the front magnet 31 and back magnet 35 work together and their relative strengths are important to ensure erasing is achieved.
  • the back magnet 35 is preferred to be stronger than the front magnet 31.
  • One possible combination is to use ferrite magnet for the front magnet 31 and neodymium magnet, which is very strong, for the back magnet 35.
  • Other material combinations are also possible.
  • the front magnet 31 and back magnet 35 can also be of the same material such as both are ferrite magnets. In such situations, the back magnet 35 should be larger in terms of surface area or thickness so that the desired effect of erasing is achieved.
  • the front erase magnetic drawing board 20 could be used in classrooms or meeting rooms and could be more than 2,000 mm wide and more than 1,000 mm high.
  • the magnetic drawing panel 21 by itself could be flimsy as its thickness could be about 0.5 mm.
  • the stiffener 22 is used to make the magnetic drawing panel 21 less flimsy and more stiff or rigid. For small sized front erase magnetic drawing board 20, it is possible to do away with the stiffener 22 if the magnetic drawing panel 21 sufficiently stiff, such as thicker magnetic drawing panel 21.
  • the stiffener 22 is preferably made of nonmagnetic material such as aluminum or wood or plastic.
  • Stiffener 22 can be of different shapes and sizes.
  • One example is the shape of a flat plate, such as the stiffener 22 in Fig. 4.
  • FIG. 5a to 5c show other examples of stiffeners.
  • Stiffeners such as rows of ribs 22a, plate with ribs 22b, front plate and back plate connected by cylindrical studs 22c are alternatives.
  • the shape of the stiffener rib is curved shaped so that the back magnet 35 can still slide over them as shown in FIG. 5b.
  • the stiffeners 22 increase the second moment of area of the magnetic drawing panel 21 so as to reduce bending during drawing and erasing.
  • the magnetic front erase eraser can be varied to take into overcome obstacles provided by the stiffeners.
  • the stiffener 22c has front plate 22cl, back plate 22c2 and cylindrical studs 22c3.
  • back panel 25 in FIG. 4 is not required as the back plate 22c2 can fulfill the function of the back panel.
  • the magnetic front erase eraser 30a has two front magnets 31a held together by the magnet holder 32a, and two separate back magnets 35a. When the front magnets 31a move over the area where the cylindrical stud 22c2 is, the two back magnets 35a can move apart and around the stud 22c2 and still follow the front magnets 31a. The area in the magnetic drawing panel above the stud 22c2 will be erased without problem.
  • the back magnet fulfils two functional needs, which include following the front magnet and erasing the magnetic drawing panel. It is possible to separate the two functions by introducing additional back magnets.
  • FIG. 6 shows the front magnet 31 and back magnets 35b and 35c.
  • the back magnets 35b and 35c are attached to the non-magnetic layer 36a and held in place relative to each other.
  • the back magnet 35b is attracted to the front magnet 31 and follows the movement of the front magnet 31.
  • the back magnet 35c serves to erase the magnetic drawing panel.
  • the back magnets 35c will move together with the non-magnetic layer 36a and the back magnet 35b.
  • the magnet holder 32a serves to also indicate to the user the area under which the magnetic drawing panel will be erased.
  • the front erase magnetic drawing board can be adapted to allow for stored images to be displayed. This is achieved by adding a layer of electromagnets and a front slave magnet.
  • the electromagnet layer 50 comprises rows of electrical conductors 51 (such as 51a and 51b), columns of electrical conductors 52 (such as 52a and 52b), and electromagnets 53 (such as 53a and 53b).
  • Each electromagnet 53 has input and output electrical connectors and is electrically connected to a row electrical conductor 51 and column electrical conductor 52.
  • Other electrical and electronic components such as processor, current driver, row and column decoder, power supply, diodes, resistors and transistors, etc are not shown. They are widely available and known in the art and can be incorporated.
  • Each electromagnet 53 can be turned on by creating a voltage potential difference between the row electrical conductor 51 and column electrical conductor 52 the electromagnet 53 is connected to. Current will flow through the row 51 and column 52 electrical conductors and electromagnet 53 and the electromagnet 53 will generate a magnetic field. The electromagnet 53 can be turned off as well by removing the potential difference between the row 51 and column 52 electrical conductors.
  • the electromagnet layer 50 can be placed behind the magnetic drawing panel 21. Stiff ener can be used as before if required.
  • the other components like frame 28 and back panel 25 are similar.
  • the front slave drawing magnet 60 is for drawing and can be controlled by the electromagnets. For example, referring to FIG. 7, by turning on electromagnet 53a then 53b, the front slave drawing magnet 60 will move from above electromagnet 53a to above 53b.
  • the front slave drawing magnet 60 has a stronger magnetic field than the electromagnet 53 and as such will cause the path on front erase magnetic drawing board 20a that it slides over to become drawn.
  • the electromagnet 53 under that part can be turned on and the image there will be erased.
  • the whole front erase magnetic drawing board 20a can be erased very quickly by turning the electromagnets on in sequence. However, the processor needs to make sure the front slave magnet 60 does not interfere with the erasing.
  • the front erase magnetic drawing board can also be adapted to allow for the saving of drawings drawn on the magnetic drawing board.
  • each sensor can represent a pixel of the drawing.
  • a processor can read off the feedback from the sensors in sequence, process them and store them. The information stored represents the image in digital form.
  • the front erase magnetic drawing board can replace existing blackboards and whiteboards, which require consumables and emit pollutants.
  • the front erase magnetic drawing board can also be adapted so that it can save images drawn or display digital images from saved storage.

Landscapes

  • Drawing Aids And Blackboards (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

L'invention porte sur une planche à dessin magnétique à effacement par l'avant qui comporte un panneau à dessin magnétique, un stylo magnétique et un effaceur magnétique et qui permet de dessiner à l'aide d'un stylo magnétique et d'effacer à partir de l'avant à l'aide de l'effaceur magnétique. L'effaceur magnétique comporte un aimant avant devant le panneau à dessin magnétique et un aimant arrière derrière le panneau à dessin magnétique. L'aimant avant peut être déplacé à partir de l'avant du panneau à dessin. L'aimant arrière suivra l'aimant avant grâce à l'attraction magnétique entre ceux-ci, et effacera le dessin sur son trajet. Le panneau à dessin magnétique peut présenter de longues étendues, avec l'incorporation de raidisseurs. Le panneau à dessin magnétique à effacement par l'avant peut de plus être adapté par l'inclusion d'une couche électromagnétique et d'un aimant à dessin avant, et d'une couche de capteur afin de lui permettre d'afficher des images sauvegardées ou de sauvegarder des images dessinées.
PCT/IB2007/055288 2007-12-21 2007-12-21 Planche à dessin magnétique à effacement par l'avant et effaceur magnétique Ceased WO2009090441A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2007/055288 WO2009090441A2 (fr) 2007-12-21 2007-12-21 Planche à dessin magnétique à effacement par l'avant et effaceur magnétique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2007/055288 WO2009090441A2 (fr) 2007-12-21 2007-12-21 Planche à dessin magnétique à effacement par l'avant et effaceur magnétique

Publications (2)

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WO2009090441A2 true WO2009090441A2 (fr) 2009-07-23
WO2009090441A3 WO2009090441A3 (fr) 2009-09-11

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PCT/IB2007/055288 Ceased WO2009090441A2 (fr) 2007-12-21 2007-12-21 Planche à dessin magnétique à effacement par l'avant et effaceur magnétique

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111016503A (zh) * 2019-12-24 2020-04-17 王誉为 一种可控型自动刷的黑板
WO2020090808A1 (fr) * 2018-11-01 2020-05-07 Ｚｅｒｏ Ｌａｂ株式会社 Effaceur magnétique, système d'écriture et dispositif d'affichage
CN115972811A (zh) * 2023-02-24 2023-04-18 清华大学 自动擦除和磁力牵引的沙画装置

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CN105741682B (zh) * 2016-05-13 2019-06-07 京东方科技集团股份有限公司 一种显示面板及显示装置

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
JPH04344688A (ja) * 1991-05-22 1992-12-01 Konica Corp 電子黒板
JP3351626B2 (ja) * 1994-06-22 2002-12-03 国際技術開発株式会社 電子黒板
JPH08324184A (ja) * 1995-06-01 1996-12-10 Kokusai Gijutsu Kaihatsu Kk 磁気ボード
JP2002321495A (ja) * 2001-04-25 2002-11-05 Pilot Corp 磁性体反転表示パネルの磁性用具
JP4089808B2 (ja) * 2001-12-25 2008-05-28 ケミテック株式会社 上消し可能なマイクロカプセル磁気泳動表示シート

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020090808A1 (fr) * 2018-11-01 2020-05-07 Ｚｅｒｏ Ｌａｂ株式会社 Effaceur magnétique, système d'écriture et dispositif d'affichage
JPWO2020090808A1 (ja) * 2018-11-01 2021-02-15 Ｚｅｒｏ Ｌａｂ株式会社 磁気消去具、筆記システムおよび表示装置
CN112912256A (zh) * 2018-11-01 2021-06-04 零实验室株式会社 消磁工具、书写系统以及显示装置
US11335487B2 (en) 2018-11-01 2022-05-17 Zero Lab Co., Ltd. Magnetic eraser, writing system and display device
CN112912256B (zh) * 2018-11-01 2022-06-24 零实验室株式会社 消磁工具、书写系统以及显示装置
CN111016503A (zh) * 2019-12-24 2020-04-17 王誉为 一种可控型自动刷的黑板
CN115972811A (zh) * 2023-02-24 2023-04-18 清华大学 自动擦除和磁力牵引的沙画装置

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