JPH08324184A - Magnetic board - Google Patents

Abstract

PURPOSE: To provide a magnetic board, in which an optional part of the characters and figures drawn can be erased from the front face, and the size of which is large. CONSTITUTION: The magnetic board is equipped with a panel 1 formed by continuously arranging cells, within each of which magnetic powder 4 and viscous fluid 5 is sealed, on a plane, a diffusing means A, with which the magnetic powder 4 in the cell 6 is diffused from above, and sheet-like magnet 2, which is superposed over the whole rear side surface of the panel 1 and attracts the magnetic powder 4 diffused by the diffusing means A from below.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic board for attracting magnetic powder in a cell with a writing instrument or a stamp having a magnet at its tip and displaying characters and pictures on a panel with the magnetic powder attracted to the upper part of the cell. Regarding

[0002]

2. Description of the Related Art Conventionally, when a character or a picture drawn on a magnetic board is erased by a writing instrument or a stamp equipped with a magnet, FIG.
As shown in (a), the plate-shaped erasing magnet 36 slidably disposed on the back surface of the magnetic board 35 is moved from one end to the other end of the magnetic board 35 by operating the handle 38. The magnetic powder moving on the surface was sucked from below to erase the characters and pictures displayed on the surface.

This magnetic board 35 has an advantage that it does not use any consumables because it can be drawn with a writing instrument having a magnet attached to its tip, as compared with a marker which is a consumable item as a general whiteboard. As described above, the back surface of the magnetic board needs the space 37 for moving the erasing magnet 36 (see FIG. 9B), and there is a problem in strength when a large magnetic board is used.

Further, the erasing magnet 36 is attached to the magnetic board 35.
There was an inconvenience that it was not possible to erase or rewrite some of the displayed characters and pictures in order to move the back side of.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a large-sized magnetic board which can be erased from the front surface of characters and pictures drawn on the magnetic board. And

[0006]

In order to achieve the above object, the magnetic board of the present invention is a panel in which cells containing magnetic powder and viscous fluid are continuously arranged on a plane, and It is characterized in that it is provided with a diffusing means for diffusing the magnetic powder from above and a sheet-like magnet for superposing on the entire back surface of the panel and attracting the magnetic powder diffused by the diffusing means from below.

A nonmagnetic spacer may be sandwiched between the panel and the sheet magnet.

Further, it is preferable that a reinforcing plate is superposed on the back side surface of the sheet magnet.

[0009]

According to the above construction, the magnetic powder moving to the upper part of the cell is diffused into the cell by the diffusing means, so that the sheet-shaped magnet superposed on the back surface of the panel is within the magnetic force of the magnet. The magnetic powder that has entered is sucked from below. When the diffusing means is continuously operated, the magnetic powder is sequentially attracted to the magnet, and all the magnetic powder in the cell that is in contact with the diffusing means moves to the lower part of the cell, and the magnetic powder can be visually recognized from the upper surface of the panel. It becomes impossible to erase only the display of the cells on the panel in which the magnetic powder is diffused by the diffusion means. In addition,
When a non-magnetic spacer is sandwiched between the panel and the sheet magnet, the range of the magnetic force for attracting the magnetic powder in the cell can be adjusted by adjusting the thickness of the spacer.

Further, when a reinforcing plate is superposed on the back side of the sheet magnet, the strength of the magnetic board increases, and it is not distorted even if pressure is applied from the front surface of the panel, so that the shape of the magnetic board is enlarged. can do.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a state of use of the magnetic board, which is a panel 1, a diffusing means A, and the panel 1 described above.
It is composed of a sheet-shaped magnet 2 which is polymerized over the entire back side thereof and is attached to a base plate 3.

As shown in FIGS. 2 and 3, the panel 1 is one in which magnetic particles 4 and a viscous fluid 5 are enclosed, and cells 6 partitioned in a honeycomb shape are continuously arranged on a plane. When the magnetic writing instrument 7 having the magnet 8 attached to the tip thereof is brought into contact with the upper surface of the magnet 6 and moved, the enclosed magnetic powder 4 is attracted to the upper part of the cell 6 and the sinking is suppressed by the viscosity of the viscous fluid 5. Even if the influence is lost, it stays at the upper part of the cell 6 and the characters and pictures can be drawn along the movement trajectory of the magnet 8.

Alternatively, the cells 6 may be formed of granular microcapsules, and the magnetic powder 4 and the viscous fluid 5 may be enclosed in the microcapsules and applied to a sheet to form the panel 1.

As shown in FIGS. 4 (a) and 4 (b), the diffusing means A comprises a cylindrical rotating magnet 10, a motor 11, a power source 12 and a switch 13 and is formed by bending the main body into a substantially V shape. The magnetic writing instrument 7 is housed inside.

The rotating magnet 10 is a columnar magnet having a plurality of magnetic poles on its circumference.
The rotating magnet 10 connected by the flexible joint 14 is provided so as to rotate when 1 is rotated.

Since the magnetic poles of the rotary magnet 10 with respect to the panel 1 are constantly reversed during rotation, the magnetic powder 4 which has been magnetized once by the magnet of the writing instrument and moved to the surface is rotated.
Since 0 rotates and the magnetic poles are constantly inverted,
As shown in (a), the magnetized magnetic powder 4 temporarily repels and diffuses into the cell 6, and the diffused magnetic powder 4 is eventually attracted to the sheet-like magnet 2 to be described later, and FIG. It is moved to the lower part of the cell 6 as shown in FIG.

In order to simplify the structure of the magnetic writing instrument 7, the main body may be formed in a linear shape, and the rotary magnet 10 may be linearly connected on the same axis as the rotation axis of the motor 11.

As shown in FIG. 6 (a), the diffusing means A has a cylindrical main body 15 and a support plate 16 made of a magnetic material such as iron. Plate-shaped magnets 17, 17 fixed so as to appear on the side,
The motor 18 is arranged, and the motor 18 is placed at the center of the support plate 16.
The tip portion 15a of the main body 15 may be brought into contact with the surface of the panel while the tip of the rotary shaft 19 is fixed and the magnet 17 is rotated in the horizontal direction to change the magnetic field, as shown in FIG. 6 (b). , Body 2 imitating eraser (blackboard wiping)
Two columnar rotary magnets 21, 21 having a plurality of poles on a circumference rotatably supported by appropriate means in 0 are arranged side by side horizontally, and at the tip of the rotary shaft 22 of the rotary magnet 21. The fixed gear 23 meshes with the drive gear 26 fixed to the tip of the rotary shaft 25 of the motor 24, and the rotating magnets 21 and 21 are rotated in conjunction with the rotation of the motor 24 to change the magnetic field and the bottom portion of the main body 20. 20a may contact the surface of the panel. Further, as shown in FIG. 6C, the cylindrical main body 2
The electromagnet 28 is arranged in the coil 7, and the current i flowing through the coil 29 is
Of the main body 2 while continuously switching the flow of
The tip 27a of 7 may contact the panel.

In FIGS. 6A, 6B and 6C, reference numeral 12 is a power source and 13 is a switch.

The sheet-like magnet 2 is composed of a sheet-like magnet having a size equal to or larger than that of the panel 1, is polymerized over the entire back side of the panel 1, and is adhered by an appropriate means such as an adhesive. The magnetic powder 4 diffused into the cell 6 by the diffusing means A is provided so as to be sucked from below the cell 6.

The strength of the magnetic force of the sheet-shaped magnet 2 is weaker than the magnetic force of the magnet 8 of the magnetic writing instrument 7 that attracts the magnetic powder 4 in the cell 6 to the upper surface of the cell 6, and exerts a magnetic force on the magnetic powder 4. The range may be set to a strength at which the magnetic powder 4 moved to the upper part of the cell 6 is not pulled back against the viscous fluid 5.

Since the magnetic board is constructed as described above, by moving the tip of the magnetic writing instrument 7 having the magnet 8 attached to the tip thereof while contacting the upper surface of the panel 1,
The magnetic powder 4 in the cell 6 is sucked to the upper part of the cell 6, and the panel 1
Characters and pictures can be displayed on the surface of the (see Fig. 3).

When erasing a picture or character once drawn, the switch 13 of the diffusing means A is turned on as shown in FIG. 5 (a).
When the motor 11 is rotated and the rotary magnet 10 is rotated and repeatedly moved so as to approach or come into contact with the surface of the panel 1 and stroke the surface of the panel 1, the magnetic pole with respect to the panel 1 is constantly maintained while the rotary magnet 10 is rotating. Since the magnetic powder 4 is once magnetized and attracted to the surface, the magnetic powder 4 is magnetized once.
Is rotated and the magnetic pole is reversed, repulsion and suction are repeated to diffusely move in the cell 6.

Of the diffused magnetic powder 4, the sheet-shaped magnet 2
The magnetic powder 4 which has entered the range of the attractable magnetic force is attracted by the sheet magnet 2 and moved to the lower surface of the cell 6, and the magnetic powder 4 not attracted by the sheet magnet 2 is rotated by the rotating magnet 10. During this time, the cells 6 are in a diffusive motion, so that they eventually enter the range of the magnetic force that can be attracted by the sheet-shaped magnet 2, and all the magnetic powder 4 is attracted by the sheet-shaped magnet 2 and moved to the lower part of the cell 6. As a result, the drawing completely disappears from the surface only in the portion in contact with the diffusing means A (see FIG. 4B).

As described above, once the magnet 8 of the magnetic writing instrument 7 is used.
Of the magnetic powder 4 attracted to the upper part of the cell 6 by the diffusion means A
Only the magnetic powder 4 of the cell 6 which has been contacted with is diffused into the cell 6,
Since all the magnetic powder 4 in the cell 6 can be moved to the lower part of the cell 6 by being attracted by the sheet-like magnet 2 superposed on the lower surface of the panel 1, it is drawn on the surface of the panel 1. It is possible to completely erase only the part of the character or picture that is in contact with the diffusion means A (see FIG. 1).

It is also possible to make the specific gravity of the viscous fluid 5 equal to or larger than the specific gravity of the magnetic powder 4. In this case, the magnetic powder 4 floats above the cell 6 in a steady state, but the magnetic powder 4 is previously diffused into the cell 6 by the diffusing means A and is attracted to the lower part of the cell 6 by the sheet magnet 2. You can leave it. As a result, when drawing with the magnetic writing instrument 7, the magnetic powder 4 is likely to move above the cell 6 and the moved magnetic powder 4 does not sink, so that characters and pictures are clearly displayed. When erasing a drawn character or picture, the magnetic powder 4 in the cell may be diffused by the diffusing means A and drawn by the sheet magnet 2.

Next, a magnetic board in which a spacer 30 is sandwiched between the panel 1 and the sheet magnet 2 as shown in FIG. 7 will be described. The spacer 30 is made of plastic, paper,
It is formed of a non-magnetic material such as wood into a plate shape, and is sandwiched between the panel 1 and the sheet magnet 2 by an appropriate method such as an adhesive.

In the magnetic board constructed as described above, the range in which the magnetic force that the sheet-shaped magnet 2 can attract the magnetic powder 4 in the cell 6 reaches can be easily adjusted by the thickness of the spacer 30. At this time, the magnetic powder 4 attracted by the magnet 8 of the magnetic writing instrument 7 can be drawn clearly without being pulled back, and the drawing can be surely erased at the time of erasing.

Further, as shown in FIG. 8A, a magnetic board in which a reinforcing plate 31 is superposed on the back side of the sheet-shaped magnet 2 will be described. The reinforcing plate 31 is made of wood, a synthetic resin such as plastic, or a non-magnetic metal such as aluminum in a plate shape, and is superposed on the back surface of the sheet magnet 2 and fixed by an appropriate method. The reinforcing plate 31 preferably has a thickness and strength such that the panel 1 is not distorted by an external force from the front surface.

The magnetic board constructed as described above does not require a space for moving the erasing magnet on the back side of the panel 1, so that the magnetic writing tool 7 may be used for drawing or the panel 1 may be touched by mistake. Also, the panel 1 is not bent and damaged.
Further, it is possible to realize a large-sized magnetic board without causing distortion in the panel 1, and it is possible to form the same size as a conventional whiteboard or a blackboard (see FIG. 8B) and to draw. Since it is not necessary to use a consumable item such as a marker as a writing instrument, running costs can be reduced and a magnetic board effective for lectures and conferences can be realized.

The magnetic board is a magnetic display means (magnetic board) of an electronic blackboard (Japanese Patent Application No. 6-164576) having automatic writing and erasing functions, which is the application of the present applicant.
Can be used as In this case, since the erasing means arranged on the back side of the magnetic board is not required, the structure can be simplified and the replacement work when the magnetic board is soiled or damaged can be facilitated.

[0033]

According to the first aspect of the invention, a character or a picture drawn by a magnetic writing instrument on a panel consisting of a cell in which magnetic powder and a viscous fluid are enclosed is magnetic in the cell when a diffusing means is brought into contact with the surface of the panel. The powder diffuses, and the sheet-shaped magnet that is polymerized on the back side of the panel attracts from below the cell, so among the magnetic powder that was once attracted to the top of the cell by the writing magnet, the cell that the diffusing means was in contact with. Only the magnetic powder in the cell diffuses into the cell and is attracted to the sheet magnet that is superposed on the lower surface of the panel, and all the magnetic powder in the cell is moved to the bottom of the cell to erase characters and pictures from the surface of the panel. can do. Further, the display is erased only at the portion where the diffusing means is brought into contact with the surface of the panel, so that it is possible to erase only an arbitrary place in the drawn characters or pictures.

According to the invention of claim 2, the range of the magnetic field of the sheet-like magnet can be easily adjusted by the thickness of the spacer, so that the magnetic powder attracted by the magnet of the writing instrument at the time of drawing is not pulled back. You can draw clearly,
When erasing, the drawing can be surely erased.

According to the invention of claim 3, it is not necessary to provide a space for moving the erasing magnet on the back side surface of the panel,
Since the reinforcing plate can be directly superposed on the sheet magnet, the panel is not bent and damaged even when an external force is applied from the surface of the panel. In addition, since a large panel can be formed because no distortion occurs in the panel, it can be used in the same way as a conventional whiteboard, and since no consumable item is used for the writing instrument, running cost can be reduced,
It is possible to realize a magnetic board that is effective for lectures and conferences.

[Brief description of drawings]

[Fig. 1] Usage diagram of the magnetic board

FIG. 2 is a perspective view showing a configuration of a magnetic board with a main part cut away.

FIG. 3 is a sectional view of the panel showing an operating state of magnetic powder.

4A and 4B are a cross-sectional view and a perspective view showing the structure of a diffusing unit.

5 (a) and 5 (b) are cross-sectional views of a main part for explaining a usage state of the diffusing means.

6 (a), (b) and (c) are explanatory views showing the configuration of another example of the above-mentioned diffusing means.

FIG. 7 is a sectional view showing the configuration of another example of the magnetic board.

8A and 8B are a sectional view and a perspective view showing still another example of the magnetic board.

9 (a) and 9 (b) are a plan view showing a usage state of a conventional magnetic board and a sectional view of an essential part for explaining the configuration.

[Explanation of symbols]

 1 Panel 2 Sheet Magnet 4 Magnetic Powder 5 Viscous Fluid 6 Cell 30 Spacer 31 Reinforcing Plate A Diffusing Means

Claims (3)

[Claims] 1. A panel in which cells in which magnetic powder and a viscous fluid are enclosed are continuously arranged on a plane, a diffusing means for diffusing the magnetic powder in the cells from above, and a whole surface of the back side of the panel is polymerized. A magnetic board, comprising: a sheet-like magnet that attracts the magnetic powder diffused by the diffusing means from below. 2. A non-magnetic spacer is sandwiched between the panel and the sheet-like magnet.
Magnetic board described in. 3. The magnetic board according to claim 1, wherein a reinforcing plate is superposed on the back side surface of the sheet-shaped magnet.