JP4014203B2 - Magnetic reversal display panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic material inversion display panel in which display bodies such as ruled lines, characters and patterns are provided in advance on a writing surface.
[0002]
[Prior art]
Conventionally, for example, a dispersion obtained by dispersing a magnetic material in which the S pole side surface portion is colored green and the N pole side surface portion is white in a liquid having a yield value mainly composed of a dispersion medium and a thickener. A liquid is stored in a plurality of liquid storage chambers (for example, honeycomb cells partitioned by a partition wall disposed on a back plate), and a transparent surface plate is provided on the front side of the liquid storage chamber to form a writing surface. In a white state (a state where the N pole side surface portion faces the writing surface), the magnetic material is reversed by a magnetic force by bringing the N pole of the magnetic pen close to the white color (the N pole side surface portion faces the writing surface). A so-called magnetic reversal display panel is known in which a green writing line (in a state where the surface area on the S pole side faces the writing surface) is formed on the background portion in the state where the magnetic recording is reversed.
[0003]
Recently, it has been desired to provide a display body such as ruled lines, characters, and patterns in advance on the writing surface of the magnetic material reversal display panel like a blackboard or whiteboard. As a method of providing the display body on the writing surface of the magnetic panel, printing on the front side of the surface plate with printing ink is described in Utility Model Registration No. 3075197. It is well known that a colored adhesive tape is attached to a crease to form a ruled line.
[0004]
[Problems to be solved by the invention]
However, since the surface plate of the magnetic reversal display panel is formed of a transparent resin, unlike white boats formed of steel plates, etc., printing cannot be performed after printing, and the printing ink can be fixed. The problem is that if the writing surface is contacted with a magnetic pen or a magnetic eraser and repeated erasing is performed, the display body peels off from the surface plate and is difficult to see. Similarly, when a colored adhesive tape is applied to the writing surface to form a ruled line, there is a problem that the adhesive tape is peeled off by a magnetic pen or a magnetic eraser and is difficult to see. Furthermore, in any of the above methods, since the display body such as ruled lines is raised from the writing surface, the magnetic pen is caught at the time of writing, and the writing feeling becomes worse, or dust or dirt adheres to the display body. In addition, since the magnetic material reversal display panel has a structure in which a writing line made of a magnetic material is formed on the back side of the transparent surface plate, when the writing line overlaps the display body, There is a problem that the writing line is hidden behind the display body and the writing line is interrupted.
[0005]
In view of these facts, the present invention assumes that the display body such as ruled lines of the magnetic body reversal display panel is not rubbed off by a magnetic pen or the like, and even when the writing line overlaps the display body, The purpose is to prevent the writing lines from being interrupted.
[0006]
[Means for Solving the Problems]
Next, the present invention devised to solve the above problems will be described.
“1. Dispersed liquid obtained by dispersing a magnetic material in which the S pole side surface portion and the N pole side surface portion are colored in different colors in a liquid having a yield value mainly composed of a dispersion medium and a thickener. In a plurality of liquid storage chambers, and a magnetic surface reversal display panel in which a transparent surface plate serving as a writing surface is provided on the upper side of the liquid storage chamber, the writing surface is the first surface portion of the S pole side. A first writing surface constituted by a first liquid storage chamber containing a first dispersion liquid in which a first magnetic material colored in color and having a surface portion colored in the N pole side colored in a second color is dispersed; A second dispersion liquid in which a second magnetic material in which the side surface portion is colored in the second color or the third color and the N pole side surface portion is colored in the first color or the fourth color is dispersed. It is characterized by being formed by a second writing surface that forms a display body, which is constituted by a second liquid storage chamber that is stored.
2. A liquid having a yield value, the main component of which is a dispersion medium and a thickener, the first magnetic body having the S pole side surface portion colored in the first color and the N pole side surface portion colored in the second color. Dispersed liquid dispersed therein is accommodated in a plurality of first liquid storage chambers, the first liquid storage chamber is covered with a transparent intermediate plate, and a concave portion is formed on the upper side of the transparent intermediate plate. A second magnetic material is provided in which a second magnetic material in which the south pole surface portion is colored in the second color or the third color and the north pole surface portion is colored in the first color or the fourth color is dispersed. Forming a second liquid storage chamber containing the dispersion liquid, a transparent surface plate serving as a writing surface on the upper side of the transparent intermediate plate, and an upper surface portion of the second liquid storage chamber on the writing surface The second writing surface constituting the display body is used as the first writing surface. "
[0007]
The display bodies such as ruled lines, characters, and patterns in the present invention are accommodated in the color of the first magnetic body accommodated in the first liquid storage chamber on the first writing surface and in the second liquid storage chamber on the second writing surface. It is important to make a color difference because it appears due to the difference in color of the second magnetic material. Note that different colors in the present invention are different in at least one of hue, brightness, and saturation.
[0008]
The magnetic reversal display panel according to the present invention includes the first magnetic surface of the first liquid storage chamber and the second magnetic body of the second liquid storage chamber mixed, and the first writing surface (background portion). ) And the color difference between the display body and the writing lines and the clearness of the display body are not impaired so that the first magnetic body and the second magnetic body are not mixed during molding. It is preferable to make it.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In order to facilitate understanding of the present invention, description will be made with reference to the drawings. FIG. 1 is a plan view showing a first state of the magnetic material reversal display panel of the first embodiment, and FIG. 2 is a schematic cross-sectional view of the relevant part of FIG. The internal structure of the magnetic reversal display panel will be briefly described with reference to FIG. 2. The magnetic reversal display panel 1 is made of a plate material between a transparent front surface plate 2 and a back surface plate 3 serving as a writing surface 2a. A bottomed honeycomb cell comprising a honeycomb cell 4 formed by combining the partition walls 4a, a bottom wall 5a formed by vacuum pressure molding, a bottom portion 5b connecting the partition walls, and a folded portion 5c located on the opposite side of the bottom portion. 5, the space between the partition walls 4a and between the partition walls 4a and 5a are defined as a first liquid storage chamber 6a, and the space between the partition walls 5a is defined as a second liquid storage chamber 6b. Further, the first magnetic body 8a having the S pole side surface portion colored green and the N pole side surface portion colored white is dispersed in a liquid 7 having a yield value mainly composed of a dispersion medium and a thickener. The dispersed liquid 9a made in this way is stored in the first liquid storage chamber 6a, and the second magnetic body in which the S pole side surface portion is colored white and the N pole side surface portion is colored green in the liquid 7 The second dispersion liquid 9b in which 8b is dispersed is stored in the liquid storage chamber 6b.
[0010]
FIG. 3 shows a part of the manufacturing process of the magnetic body inversion display panel 1 of the present embodiment. A part of the manufacturing process of the magnetic reversal display panel will be briefly described with reference to FIG. 3. First, the bottomed honeycomb cell 5 is arranged with the bottom 5b facing downward, and the opening is directed upward. (The state where FIG. 2 and FIG. 3 are turned upside down), the second dispersion liquid 9b is accommodated in the second liquid storage chamber 6b, and the back plate 3 is bonded to the partition wall 5a and the folded portion 5c. The dispersion liquid 9b is sealed, and then turned upside down. As shown in FIG. 3, the partition walls 4a of the honeycomb cells 4 are adhered to the bottomed honeycomb cells 5 of the back plate 3 to form a first liquid storage chamber. 6a is formed, the first dispersion liquid 9a is stored in the first liquid storage chamber 6a, and then the transparent surface plate 2 is bonded to the partition walls 4a of the honeycomb cells 4 and the bottom 5b of the honeycomb cells 5 to form the first A dispersion liquid is enclosed (see FIG. 2).
[0011]
Further, as shown in FIG. 2, the magnetic reversal display panel 1 in the first state is reciprocated in a state where the south pole of the magnetic eraser 50 is in contact with the writing surface 2a, and the magnetic force g ( The first magnetic body 8a and the second magnetic body 8b both have their north poles facing the writing surface 2a and are dispersed in the first dispersion liquid 9a by the one-dot chain line arrow in the figure. The white writing surface 10a of white (N pole side surface portion) is composed of the magnetic body 8a, and the green (N pole side surface portion) of the second magnetic body 8b dispersed in the second dispersion liquid 9b becomes a ruled line. A second writing surface 10b is configured.
[0012]
FIG. 4 is a plan view when writing is performed on the writing surface 2a of the magnetic material reversal display panel 1 in the first state with a magnetic pen, and FIG. 5 is a schematic cross-sectional view of an essential part of FIG. As shown in FIG. 5, the magnetic reversal display panel 1 moves the north pole of the magnet 61 disposed in the front part of the magnetic pen 60 in the direction of arrow V in a state where it is in contact with the writing surface 2a. The first magnetic body 8a and the second magnetic body 8b are reversed by the magnetic force h (the arrow of the alternate long and short dash line in the figure), and both magnetic bodies are between the movements of the magnetic pen 60 (between A in FIG. 5). The south poles 8a and 8b are directed to the writing surface 2a. As shown in FIGS. 4 and 5, the writing line A is a second line that overlaps the second writing surface 10 b although the line color is different between the first magnetic part A <b> 1 and the second magnetic part A <b> 2. The magnetic part A2 is white (S pole side surface part) facing the writing surface 2a, and the second writing surface 10b through which the magnetic pen 60 does not pass is green (N pole side surface part). The overlapping writing lines can be distinguished and displayed without interruption.
[0013]
FIG. 6 is a plan view showing a second state of the magnetic material inversion display panel of the present embodiment, and FIG. 7 is a schematic cross-sectional view of the relevant part of FIG. The magnetic reversal display panel 1 in the second state is reciprocated in a state where the N pole of the magnetic eraser 50 is in contact with the writing surface 2a, and the magnetic force i of the magnetic eraser 50 (dotted line arrow in the figure). Each of the first magnetic body 8a and the second magnetic body 8b has the south pole facing the writing surface 2a, and the first magnetic body 8a dispersed in the first dispersion liquid 9a is green (the south pole). Side surface portion) of the first writing surface 10a, and the second magnetic body 8b dispersed in the second dispersion liquid 9b constitutes the second writing surface 10b of white (S pole side surface portion) serving as a ruled line. It is. In order to write a writing line on the magnetic material inversion display panel 1 in the second state, a magnetic pen having an S pole at the tip is used.
[0014]
FIG. 8 is a plan view when writing is performed on the writing surface 2a of the magnetic reversal display panel 1 in the second state with a magnetic pen, and FIG. 9 is a schematic cross-sectional view of the relevant part of FIG. As shown in FIG. 9, the magnetic body reversal display panel 1 moves the south pole of the magnet 71 disposed in the front part of the magnetic pen 70 in the direction of the arrow W in a state where the magnet 71 is in contact with the writing surface 2 a. The first magnetic body 8a and the second magnetic body 8b are reversed by the magnetic force j (arrows indicated by the alternate long and short dash line in the figure), and both magnetic bodies are between the movements of the magnetic pen 70 (between B in FIG. 9). The N poles 8a and 8b are directed to the writing surface 2a. As shown in FIGS. 8 and 9, the writing line B is a second line that overlaps the second writing surface 10b, although the line color is different between the first magnetic part B1 and the second magnetic part B2. The magnetic part B2 has the writing surface 2a facing green (N pole side surface part), and the second writing surface 10b through which the magnetic pen 70 does not pass is white (S pole side surface part). The overlapping writing lines can be distinguished and displayed without interruption.
[0015]
FIG. 10 is a plan view showing a magnetic reversal display panel according to the second embodiment, and FIG. 11 is a schematic cross-sectional view of an essential part of FIG. In the magnetic reversal display panel 101, a honeycomb cell 4 formed by combining partition walls 4a made of plate materials is interposed between a transparent front plate 2 and a back plate 3 serving as a writing surface 2a. In the figure, a portion 10a is a first liquid storage chamber 106a that contains the same dispersion liquid 9a as in the first embodiment and serves as a first writing surface, and a portion 10b is a first liquid storage chamber 106a that contains the dispersion liquid 9b. There are two writing surfaces. In the present embodiment, the first magnetic body 8a and the second magnetic body 8b accommodated in the adjacent first liquid storage chamber 106a and second liquid storage chamber 106b are prevented from being mixed. Therefore, at the time of manufacture, the honeycomb cells are fixed to the back plate 3 to form both the liquid storage chambers 106a and 106b, and the first liquid storage chamber 106a is provided with the first magnetic body 8a and the second liquid storage chamber 106a. The second magnetic body 8b is placed in the liquid storage chamber 106b, and both the magnetic bodies 8a and 8b are attracted from the back of the back plate 3 to the back plate 3 side by a magnet, and then the liquid 7 is added to both liquids. In this step, the first dispersion liquid 9a and the second dispersion liquid 9b are sealed by accommodating the transparent surface plate 2 on the partition walls 4a of the honeycomb cells 4 in the accommodation chambers 106a and 106b. Since other structures and operations are the same as those of the magnetic reversal display panel 1 of the first embodiment, description thereof will be omitted.
[0016]
FIG. 12 is a plan view showing a first state of the magnetic body reversal display panel of the third embodiment, and FIG. 13 is a schematic cross-sectional view of the relevant part of FIG. The internal structure of the magnetic material reversal display panel will be briefly described with reference to FIG. 13. The magnetic material reversal display panel 201 includes a first transparent surface plate 202 and a second transparent surface plate 220 that serve as a writing surface 202a. And a honeycomb cell 204 formed by combining partition walls 204a made of a plate material is interposed between the second transparent front plate 220 and the back plate 3. A space between the partition walls 204a is a first liquid storage chamber 206a. A groove 220a is engraved on the front side of the second transparent surface plate 220, and the inside of the groove 220a serves as a second liquid storage chamber 206b. Further, the first magnetic body 8a having the south pole and the north pole, the south pole side surface portion being colored green and the north pole side surface portion being colored white is a yield mainly composed of a dispersion medium and a thickener. The first dispersion liquid 9a dispersed in the liquid 7 having the value is stored in the liquid storage chamber 206a, and the liquid 7 has the south pole and the north pole, and the surface area on the south pole side is colored white. A second dispersion liquid 9b in which a second magnetic body 8b having a pole-side surface colored green is dispersed in a second liquid storage chamber 206b.
[0017]
Next, a part of the manufacturing process of the magnetic body reversal display panel 201 will be described briefly. First, the back plate 3 is bonded to the honeycomb cell 204a to form the first liquid storage chamber 206a, and the first liquid The first dispersion liquid 9a is accommodated in the accommodation chamber 206a, the partition wall 204a of the honeycomb cell 204 is adhered to the back side of the second transparent surface plate 220, and the first dispersion liquid 209a is enclosed, and the second transparent liquid 209a is sealed. The second dispersion liquid 9b is accommodated in a second liquid storage chamber 206b (groove 220a) provided on the front side of the surface plate 220, and the first transparent surface plate 202 is provided on the front side of the second transparent surface plate 220. The second dispersion liquid 9b is sealed and formed in the second liquid storage chamber 206b.
[0018]
Further, as shown in FIG. 13, the magnetic reversal display panel 201 in the first state is reciprocated in a state where the south pole of the magnetic eraser 50 is in contact with the writing surface 202a, and the magnetic force g ( The first magnetic body 8a and the second magnetic body 8b both have their north poles directed to the writing surface 2a and are dispersed in the first dispersion liquid 9a. The first writing surface 10a of white (N-pole side surface portion) is composed of the magnetic material 8a, and the green color (N-pole side surface portion) that is ruled by the second magnetic body 8b dispersed in the second dispersion liquid 9b. The second writing surface 10b is configured.
[0019]
14 is a plan view when writing is performed on the writing surface 202a of the magnetic material reversal display panel 201 in the first state with a magnetic pen, and FIG. 15 is a schematic cross-sectional view of the relevant part of FIG. As shown in FIG. 15, the magnetic body reversal display panel 201 moves in the arrow X direction in a state where the N pole of the magnet 61 disposed in front of the magnetic pen 60 is in contact with the writing surface 202 a, and The first magnetic body 8a and the second magnetic body 8b are reversed by a magnetic force h (indicated by an alternate long and short dash line in the figure), and both magnetic bodies 8a are in the middle of movement of the magnetic pen 60 (between C in FIG. 15). , 8b is directed to the writing surface 202a. As shown in FIGS. 14 and 15, the writing line C is a second line that overlaps the second writing surface 10b, although the line color is different between the first magnetic part C1 and the second magnetic part C2. The magnetic part C2 is white (S pole side surface part) facing the writing surface 202a, and the second writing surface 10b through which the magnetic pen 60 does not pass is green (N pole side surface part). The overlapping writing lines can be distinguished and displayed without interruption.
[0020]
FIG. 16 is a plan view showing a second state of the magnetic reversal display panel of the third embodiment, and FIG. 17 is a schematic cross-sectional view of the relevant part of FIG. The magnetic reversal display panel 201 in the second state is reciprocated in a state where the N pole of the magnetic eraser 50 is in contact with the writing surface 202a, and is generated by the magnetic force i of the magnetic eraser 50 (dotted line arrow in the figure). The first magnetic body 8a and the second magnetic body 8b both have the south pole facing the writing surface 202a, and the first magnetic body 8a dispersed in the first dispersion liquid 9a is green (the south pole). Side surface portion) of the first writing surface 10a, and the second magnetic body 8b dispersed in the second dispersion liquid 9b constitutes the second writing surface 10b of white (S pole side surface portion) serving as a ruled line. It is. In order to write a writing line on the magnetic material inversion display panel 201 in the second state, a magnetic pen having an S pole at the tip is used.
[0021]
18 is a plan view when writing is performed on the writing surface 202a of the magnetic material reversal display panel 201 in the second state with a magnetic pen, and FIG. 19 is a schematic cross-sectional view of the relevant part of FIG. As shown in FIG. 19, the magnetic body reversal display panel 201 moves the south pole of the magnet 71 disposed in front of the magnetic pen 70 in the direction of the arrow Y in a state where the magnetic pole 70 is in contact with the writing surface 202 a. The first magnetic body 8a and the second magnetic body 8b are reversed with a magnetic force j (arrows indicated by a dashed line in the figure), and both magnetic bodies are between the movements of the magnetic pen 70 (between D in FIG. 19). The N poles 8a and 8b are directed to the writing surface 202a. As shown in FIGS. 18 and 19, the writing line D is a second line that overlaps the second writing surface 10b, although the line color is different between the first magnetic part D1 and the second magnetic part D2. The magnetic part D2 has the writing surface 202a facing green (N pole side surface part), and the second writing surface 10b through which the magnetic pen 70 does not pass is white (S pole side surface part). The overlapping writing lines can be distinguished and displayed without interruption.
[0022]
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications are made within the scope of the gist of the present invention described in the claims. Can do. For example, it is possible to adopt a panel structure in which a microcapsule is used as a liquid storage chamber and a dispersion liquid (a liquid in which a magnetic material is dispersed in a liquid having a yield value) is stored. Further, when the first magnetic body is color-coded into green and white as in the present embodiment, the color of the second magnetic body is completely different from the color of the first magnetic body, for example, blue and red. Different combinations may be colored.
[0023]
FIG. 20 is a reference figure showing a modification of the present invention. In the magnetic reversal display panel 301, the S pole side surface portion of the first magnetic body constituting the first writing surface 10a serving as the background is blue. The S pole side surface portion of the second magnetic body constituting the second writing surface 10b serving as the ruled line is yellow, and conversely, the N pole side surface portion of the first magnetic body is yellow, and the N magnetic side of the second magnetic body is N. The first writing surface 10a shown in FIG. 20A is yellow and the second writing surface 10b because the pole-side surface portion is colored with a large difference in the color of the same magnetic pole of both magnetic bodies so as to be blue. Even in the writing surface 302a in the blue state, the first writing surface 10a shown in FIG. 20B, which is changed by moving the magnet 80 in the direction of the arrow, is also blue in the writing surface 302a in the state where the second writing surface 10b is yellow. , Second writing surface 10b (with respect to first writing surface 10a (background portion) Line) it is always easy to see things. This relationship is preferable because the relationship is also established between the first writing surface and the writing line. In addition, as shown in the figure, when using a magnet that can contact the writing surface widely in parallel with the S pole and the N pole, or a magnet that can contact the writing surface in a wide area, The effect that the color of a 1st writing surface (background part) and a 2nd writing surface (display body) can be easily replaced simultaneously arises. On the other hand, FIG. 21 is a reference figure showing a magnetic reversal display panel provided with a conventional ruled line. The magnetic reversal display panel 401 has a blue surface and an N pole on the S pole side surface portion of the first magnetic body. The side surface portion is colored yellow, and a marking line 402b is provided on the writing surface 402a with black ink. The ruled line 402b is easy to see when the writing surface 402a is yellow (the state shown in FIG. 21A), but in the blue state (FIG. 21B) changed by moving the magnet 80 in the direction of the arrow, the ruled line 402b is difficult to see. .
[0024]
【The invention's effect】
Since the magnetic body reversal display panel of the present invention has the structure as described above, the display body such as ruled lines is not raised from the surface of the transparent surface plate, and is not rubbed off by a magnetic pen or the like. In addition, even when the writing line overlaps the display body, the writing line is not interrupted.
[Brief description of the drawings]
FIG. 1 is a plan view showing a first state of a magnetic material inversion display panel according to a first embodiment.
FIG. 2 is a schematic cross-sectional view of the relevant part in FIG.
FIG. 3 shows a part of the manufacturing process of the magnetic body inversion display panel of the first embodiment.
FIG. 4 is a plan view when writing on the writing surface of the magnetic reversal display panel in the first state of the first embodiment with a magnetic pen;
5 is a schematic cross-sectional view of the relevant part in FIG. 4. FIG.
FIG. 6 is a plan view showing a second state of the magnetic reversal display panel of the first embodiment.
7 is a schematic cross-sectional view of the relevant part in FIG. 6. FIG.
FIG. 8 is a plan view when writing is performed on the writing surface of the magnetic reversal display panel in the second state of the first embodiment with a magnetic pen;
9 is a schematic cross-sectional view of the relevant part in FIG.
FIG. 10 is a plan view showing a first state of the magnetic reversal display panel of the second embodiment.
11 is a schematic cross-sectional view of the relevant part in FIG.
FIG. 12 is a plan view showing a first state of a magnetic material inversion display panel according to a third embodiment.
13 is a schematic cross-sectional view of the relevant part in FIG.
FIG. 14 is a plan view when writing is performed on the writing surface of the magnetic reversal display panel in the first state of the third embodiment with a magnetic pen;
15 is a schematic cross-sectional view of the relevant part in FIG. 14;
FIG. 16 is a plan view showing a second state of the magnetic reversal display panel of the third embodiment.
17 is a schematic cross-sectional view of the relevant part in FIG.
FIG. 18 is a plan view when writing is performed on the writing surface of the magnetic reversal display panel in the second state of the third embodiment with a magnetic pen;
19 is a schematic cross-sectional view of the relevant part in FIG.
FIG. 20 is a reference figure showing a modification of the present invention.
FIG. 21 is a reference figure showing a conventional magnetic material inversion display panel provided with ruled lines.
[Explanation of symbols]
1, 101, 201, 301, 401 ... Magnetic body inversion display panel,
2, 202 ... transparent surface plate, 2a, 202a, 302a, 402a ... writing surface,
202 ... 1st transparent surface board, 202a ... writing surface,
220 ... second transparent face plate, 220a ... groove,
3 ... back plate,
4,204 ... honeycomb cells, 4a, 204a ... partition walls,
5 ... Honeycomb cell with bottom, 5a ... partition wall, 5b ... bottom part, 5c ... folded part,
6a, 106a, 206a ... first liquid storage chamber,
6b, 106b, 206b ... second liquid storage chamber,
7 ... Liquid, 8a ... First magnetic body, 8b ... Second magnetic body,
9a: first dispersion liquid, 9b: second dispersion liquid.

Claims (2)

A plurality of dispersed liquids formed by dispersing a magnetic material in which the S pole side surface portion and the N pole side surface portion are colored in different colors in a liquid having a yield value mainly composed of a dispersion medium and a thickener. In the magnetic reversal display panel, which is housed in the liquid storage chamber and provided with a transparent surface plate serving as a writing surface on the upper side of the liquid storage chamber, the writing surface and the S pole side surface portion are colored in the first color. A first writing surface composed of a first liquid storage chamber containing a first dispersion liquid in which a first magnetic material having a N-colored surface portion colored in a second color is dispersed; and a S-pole side surface portion In the second color or the third color and the second dispersion liquid in which the second magnetic material in which the N pole side surface portion is colored in the first color or the fourth color is dispersed is contained. A magnetic reversal display panel comprising a second writing surface comprising a second liquid storage chamber and forming a display body. A liquid having a yield value, the main component of which is a dispersion medium and a thickener, the first magnetic body having the S pole side surface portion colored in the first color and the N pole side surface portion colored in the second color. Dispersed liquid dispersed therein is accommodated in a plurality of first liquid storage chambers, the first liquid storage chamber is covered with a transparent intermediate plate, and a concave portion is formed on the upper side of the transparent intermediate plate. A second magnetic material is provided in which a second magnetic material in which the south pole surface portion is colored in the second color or the third color and the north pole surface portion is colored in the first color or the fourth color is dispersed. Forming a second liquid storage chamber containing the dispersion liquid, a transparent surface plate serving as a writing surface on the upper side of the transparent intermediate plate, and an upper surface portion of the second liquid storage chamber on the writing surface A magnetic material reversal display panel characterized in that the second writing surface constituting the display body is used and the other parts are used as the first writing surface.

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