JPH07104684A - Display for magnetic display and magnetic display device - Google Patents

Abstract

PURPOSE:To provide a display for magnetic display with which reversible display is possible and which is distinct in brightness and darkness in parts impressed with magnetism from non-impressed parts, has high resolution, is bright and is excellent in stability of images and the magnetic display device. CONSTITUTION:This display 1 for magnetic display has a magnetic display layer 12 contg. microcapsules 14 including an org. solvent which is dispersed with magnetic powder and pigments and has a viscosity at an ordinary temp. of >=200cps and a viscosity under heating of <=100cPs. This magnetic display device has the display 1 for magnetic display and a thermomagnetic head driving section consisting of a thermomagnetic head device for recording and erasing. The device scans the display from its front surface side at the time of recording. The device heats the entire surface and impresses magnetism over the entire surface from the rear surface or partially scans the rear surface at the time of erasing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic display for displaying an image by magnetism upon heating and a magnetic display device using the same, and particularly to a magnetic display capable of reversible display excellent in resolution and image stability. The present invention relates to a display and a magnetic display device using the same.

[0002]

2. Description of the Related Art Conventionally, as a display utilizing magnetism, a magnetic field is applied to a suspension in which magnetic particles are dispersed in a coloring dispersion medium, as described in, for example, JP-A-48-56393. A method is known in which the magnetic particles are moved to change the color of the colored dispersion medium and display is performed.

However, in such a display, when a suspension is sealed between two substrates and a magnetic pen is used to draw characters and a pattern from one substrate to apply magnetism, magnetic particles of the suspension are attracted, Although the characters and patterns can be obtained as they are, since the specific gravity of the magnetic particles is much larger than that of the dispersion medium, the attracted magnetic particles have a drawback that the characters and patterns cannot be retained for a long time because they settle out with time.

Further, since all the magnetic particles magnetized by the magnetic pen are attracted to the magnetic pen, the magnetic particles existing apart from the magnetic pen are also attracted, so that only unclear characters and patterns are obtained. It also had drawbacks. In order to prevent sedimentation of magnetic particles, for example, if the magnetic particles are made finer or the magnetic particles are coated with a polymer having a low specific gravity, and the apparent specific gravity of the magnetic particles approximates that of the dispersion medium, the magnetic particles Since the force becomes extremely small, it becomes difficult to be sucked by the magnetic pen, which causes a defect that it is not possible to obtain a clear character or pattern with high density.

Further, if the apparent specific gravity of the magnetic particles is approximated to that of the dispersion medium, the magnetic particles are difficult to be attracted to the opposite side of the substrate even when characters and patterns are erased, and the particles cannot be completely erased. Repeatedly, it turned black overall, which was not practical.

As a mode for solving these drawbacks, for example, Japanese Examined Patent Publication No. 57-27463 and Japanese Unexamined Patent Publication No. 62-53359.
As described in the publication, as a dispersion medium, a liquid having a yield value of a certain value or more, or by using a thickener, it is possible to display clear, high-contrast characters and images without blurring, A display is known in which the display can be held stably for a long time and can be completely erased.

However, in this display, a transparent plastic sheet is formed on the entire surface so that honeycomb cells each having a side and a depth of about 2 mm are provided, and magnetic particles and a white pigment are dispersed in the cells. The suspension dispersed in a medium was injected, and the suspension was sealed with a transparent sheet, which had the following drawbacks. That is, since the image is formed by moving the magnetic particles from the back surface to the front surface in the honeycomb-shaped cell, it is impossible to make the resolution of the image smaller than that of the honeycomb-shaped cell. Further, it is difficult to form honeycomb cells, to make the honeycomb cells large or very small, and to inject a suspension into the honeycomb cells.

As another mode, for example, Japanese Patent Laid-Open No. 1-14
5637 or Eyne S. et al. Trumb
le P.L. S. & E. No. 7 213 (1963), unlike a display in which magnetic particles and a pigment are sealed in a honeycomb-shaped cell as described above, the magnetic particles are encapsulated in microcapsules and coated on a support. Display is known. According to this method
By controlling the particle size of the microcapsules, the resolution can be increased and the manufacturing process is easy. Also,
Various films and the like can be selected as the substrate on which the microcapsules are applied, and the shape and size can be freely selected.

However, in the image forming method shown here, at the time of display preparation, the magnetic powder in the applied capsules is orientated in advance in parallel with the plane of the display so that all the incident light is reflected to make it appear bright.
Next, by magnetically recording, the magnetic powder rotates and scatters and absorbs incident light, resulting in contrast and forming a black image. That is, the magnetic powder used here is generally limited to flat particles such as nickel, iron, and barium-ferrite, and the principle of image formation is based on the orientation of the magnetic powder. It is necessary to always orient the flat surface parallel to the plane of the magnetic recording medium, but in this way, evenly in a certain direction,
It is difficult to completely orient, and the magnetic powder which is not completely orientated results in an unclear image of light and dark.

Further, as another form using the microcapsules, for example, as disclosed in JP-A Nos. 2-146082 and 4-233581, light-absorbing magnetic particles and light-reflecting particles are used. A display in which non-magnetic particles are enclosed in microcapsules is known.

In the image formation of this form, first, the permanent magnet attracts the light-absorbing magnetic particles in the microcapsules to the back surface side of the display, and accordingly, the light-reflecting non-magnetic particles remain on the surface of the display. By doing so, the surface becomes the color of the non-magnetic particles and the erased state is achieved. Next, apply magnetism from the display surface with a permanent magnet.
By recording, the light absorbing magnetic particles are attracted to the surface by magnetism, and desired characters and images are formed.

However, since the display thus obtained has a wide range of magnetic force, its resolution is very inferior to that of recording by other heat or light. Furthermore, since the above-mentioned display can be easily printed and erased by magnetic force, the stability of the image may be caused by fogging the unprinted part or erasing the image just by touching the magnet. Has the disadvantage of being bad.

[0013]

A conventional display using a magnetic material as a display means cannot display a high-resolution image, and the displayed image is partially or readable due to the influence of external magnetism. However, stable recording could not be performed because the image was erased or fog was generated in the unprinted part in a state where it was impossible. In addition, there has been no display having the mobility of the magnetic powder contained therein, that is, both the good recording reactivity and the recorded image stability.
In view of the above, the present invention provides a reversible display capable of reversible display, in which a portion to which magnetism is applied has a bright and dark distinction from a portion to which no magnetism is applied, has high resolution, is clear, and has excellent image stability. An object is to provide a magnetic display device.

[0014]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and the magnetic display according to the invention of claim 1 has at least one of a non-magnetic material having transparency. The magnetic powder and the pigment are dispersed between the supports, and the viscosity at room temperature is 200 cps or more and the viscosity when heated is 10 cps or more.
The magnetic display layer is characterized in that microcapsules containing an organic solvent of 0 cps or less are dispersed and arranged in a binder.

In the magnetic display according to the invention of claim 2, the average particle size of the microcapsules is from 10 μm to 1 μm.
It is between 000 μm.

In the magnetic display according to the invention of claim 3, the average particle diameter of the magnetic powder is between 0.1 μm and 10 μm.

In the magnetic display according to the invention of claim 4, the average particle diameter of the pigment is between 0.01 μm and 10 μm.

In the magnetic display device according to a fifth aspect of the present invention, the pigment has a refractive index of 1.5 or more.

According to a sixth aspect of the present invention, there is provided a magnetic display device, in which at least one magnetic powder and a pigment are dispersed between supports, at least one of which is a transparent non-magnetic material, and a viscosity thereof at room temperature is 200 cps. A magnetic display for forming a magnetic display layer comprising microcapsules containing an organic solvent having a viscosity of 100 cps or less when heated and dispersed in a binder, and a display surface of the magnetic display. Placed on the side,
It is arranged on the back side of the display for magnetic display and a heating magnetism generating means for partially attracting and moving the magnetic powder in the microcapsule by heating and applying magnetic force, and attracting and moving the magnetic powder in the microcapsule by heating and applying magnetic force. A heating magnetism generating means is provided, and the magnetic powder in the microcapsules is unevenly distributed on one surface.

[0020]

The magnetic display and the magnetic display device of the present invention, in which magnetic powder and pigment are dispersed, have a viscosity of 200 cps or more at room temperature and a viscosity of 100 c when heated.
It has a magnetic display layer containing microcapsules encapsulating an organic solvent of ps or less. Usually, magnetic powder is attracted to the back surface which is one surface of the magnetic display, that is, below the microcapsules. The surface of the magnetic display, which is the other surface, has a uniform color tone due to the color of the pigment.

Recording on the magnetic display and magnetic display device of the present invention is performed by scanning from the surface side of the magnetic display with a magnetism generating means having a heating means, and the viscosity is lowered by heat to be in a fluidized state. The magnetic powder in the dispersion medium part is magnetically moved to the upper side of the microcapsule, that is, the surface on the side of the magnetic generation means, and a black image is formed by the magnetic powder. The magnetic powder is attracted to the side of the magnetic generation means below the microcapsules by applying magnetism to the entire surface from the back side of the magnetic field or by scanning the back side with a magnetic generation means having a heating means, and the surface of the magnetic display is displayed. Becomes the pigment color again and the image is erased.

[0022]

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 1 shows the structure of a magnetic display 1 according to the present invention, in which a support 11 and a magnetic display layer 12 coated with a coating material in which microcapsules 14 containing magnetic powder and the like are dispersed in a binder 15, Further, the protective support 13 is sequentially laminated. 2 is a sectional view showing an embodiment of the microcapsules 14 used in the magnetic display layer 12 in the present invention. In FIG. 2, a microcapsule comprises a core substance 21 mainly composed of a suspension in which a magnetic powder 22 and a pigment 23 are dispersed in an organic solvent 24 having a viscosity of 200 cps or more at room temperature and a viscosity of 100 cps or less when heated. , A shell material 25 made of a polymer is encapsulated.

As the magnetic powder 22, it is possible to use magnetic powder alone, a mixture of several kinds of magnetic powder, or a mixture of magnetic powder and polymer. For example, magnetite, ferrite and other iron, cobalt, nickel, and other ferromagnets, alloys containing these elements, or compound fine particles are used. In this case, the magnetic powder may be subjected to a surface treatment such as a silane coupling treatment in order to enhance the affinity with the wax or the like. When a mixture of magnetic powder and polymer is used, the above magnetic powder and polymer are kneaded and then pulverized, or a monomer in which the magnetic powder is dispersed is subjected to emulsion polymerization, suspension polymerization, dispersion polymerization, or the like. And the like are used for the polymerization. In this case, the polymer is preferably crosslinkable.
The size of the magnetic powder is preferably 0.1 μm to 10 μm in consideration of the ease of movement by magnetism, the image density and the like.

As the pigment 23, a single pigment, a mixture of several pigments, and a mixture of a pigment and a polymer can be used. For example, fine particles of commonly known inorganic pigments such as titanium dioxide, zinc sulfide, lead titanate, zirconium oxide, lead white, cadmium red, and cadmium yellow, and organic pigments such as phthalocyanine pigments are used. In this case, the pigment may be subjected to a surface treatment such as a silane coupling treatment in order to enhance the affinity with the organic solvent and the like. When a mixture of pigment and polymer is used, the above pigment and polymer are kneaded and then pulverized.
Alternatively, a method in which a monomer in which a pigment is dispersed is polymerized using a method such as emulsion polymerization, suspension polymerization, or dispersion polymerization is used. In this case, the polymer is preferably crosslinkable. The size of the pigment is preferably 0.01 μm to 10 μm in consideration of hiding the magnetic powder.
Further, the refractive index of the pigment is preferably 1.5 or more in order to conceal the color of the magnetic powder more strongly.

The organic solvent 24 may be at room temperature (about 10-4).
Any material having a viscosity of 200 cps or less in a range of 0 ° C.), such as liquid paraffin, natural resin, and synthetic resin, which are generally known, can be appropriately used.

The core substance 21 containing the above-mentioned magnetic powder 22, pigment 23, organic solvent 24, etc. as main components is covered with a shell substance 25 such as a polymer to be microencapsulated. This shell substance 2
Examples of the resin used as 5 include commonly used resins such as acrylic resin, methacrylic resin, polystyrene, polyester resin, polyurethane resin, polyurea resin, polyamide resin, epoxy resin, and natural resin. It is also possible to use singly or as a mixture of two or more kinds.

The method for producing the microcapsules having the above-mentioned shell material includes a phase separation method in which a concentrated phase of the polymer is separated around the core material dispersed in the polymer solution, and a method of separating the polymer around the core material in the polymer solution. In-liquid coating method in which a polymer is cured with a curing test agent, etc., an in-situ weight that coats the surface of the core substance with the polymer by supplying a monomer or a polymerization catalyst from either one of the emulsion in which the core substance is dispersed or the external phase. Suitable methods include, but are not limited to, microencapsulation techniques such as interfacial polymerization in which a monomer is supplied from both the internal phase and the external phase of the emulsion in which the core substance is dispersed.

In particular, the magnetic powder as a core substance and the pigment are uniformly dispersed in a solvent to produce a monomer from an external phase of a suspension, or a phase separation method is used to produce a uniform particle size. In addition, it is possible to manufacture microcapsules in which magnetic powder and pigment can be easily moved. The polymerizable monomer used here is preferably acrylic acid ester, methacrylic acid ester, styrene and its derivatives, isocyanate, various amines, compounds having an epoxy group, and the like.

In the magnetic display of the present invention, the magnetic display layer 12 is formed by coating the support 11 with the microcapsules 14 having the above-mentioned structure together with the binder 15.
Further, it is produced by stacking the protective support 13.

The support 11 is a synthetic resin such as polyvinyl chloride, polyester, polycarbonate, polymethylmethacrylate, polystyrene, polyethylene terephthalate, natural resin, paper, synthetic paper, metal, ceramics, etc., alone or in combination. Can be used. In addition, its shape can be selected according to the application such as a card shape or a sheet shape, a film shape, and further considering the physical properties required according to the application, for example, strength, rigidity, hiding power, light opacity, etc. It can be appropriately selected.

As the binder 15 in which the microcapsules 14 are dispersed, a water-based binder, a solvent-based binder, an emulsion-based binder or the like is appropriately used.
Further, as the protective support 13, epoxy resin, tetrafluoroethylene, etc., or polyvinyl chloride, polyester, polycarbonate, polymethyl methacrylate,
Synthetic resins such as polystyrene and polyethylene terephthalate, natural resins and the like can be used. This protective support 1
3 is a microcapsule 14 formed on the support 11.
It is necessary that the microcapsules 14 be retained and that the microcapsules 14 be visible from the outside, and any of them can be used as long as they satisfy necessary conditions such as strength.

These forming methods include well-known printing methods such as offset printing method, gravure printing method and silk screen printing method, coating methods such as roll coating method and knife edge method, and the microcapsules 14 described above. A transfer method using a transfer sheet in a transfer layer, an ink jet method in which ink containing the above-mentioned microcapsules 14 is sprayed onto a base material, and a solution containing the above-mentioned microcapsules 14 between a support 11 and a protective support 13. Can be prepared by a forming method such as a filling method, and can be appropriately selected from the above-mentioned methods depending on the use and quantity of the information recording medium to be prepared.

Next, an image forming method in the magnetic display of the present invention will be described. FIG. 3 shows an enlarged cross-section of a part of the magnetic display of the present invention in which the magnetic powder 22 and the microcapsules 14 containing the suspension in which the pigment 23 is dispersed in the organic solvent 24 are applied on the support 11. FIG. Initially, the magnetic powder 22 and the pigment 23 are fixed in the organic solvent 24 in a uniformly dispersed state in the microcapsule 14 at the time of production.

FIG. 4 is an explanatory diagram showing a state when a normal image is erased, that is, when no image is recorded. The entire surface of the magnetic display is uniformly heated, the viscosity of the organic solvent 24 in the microcapsules is lowered and the fluidity is increased, and the magnetic force applied uniformly from the back surface of the magnetic display causes the microscopic display of the magnetic display layer 12. The magnetic powder 22 in the capsule is attracted below the microcapsule, and the surface of the magnetic display has a uniform color tone due to the color of the pigment 23.

FIG. 5 is an explanatory diagram showing a state in which recording is performed by applying magnetism from a magnetism generating means having a heating function from above the magnetic display. The organic solvent 24 in the microcapsules in the portion heated by the heat / magnetic head device 27, which is a magnetism generating means with a heating function, such as liquid paraffin, has increased fluidity, and the magnetic powder 22 in the microcapsules is micronized due to magnetism. Pulled above the capsule. On the other hand, in the portion not heated by the thermal / magnetic head device 27, the magnetic powder 22 does not move inside the microcapsule, and the pigment 23 exists above the microcapsule. Therefore, by heating and magnetically applying the recording portion in accordance with the recording information, a black image of the magnetic powder in the recorded portion can be obtained in the color of the pigment in the unrecorded portion. The thermal / magnetic head device 27 is an ordinary magnetic head to which a heating unit such as a heater is added, and the heating unit may have a heating capacity enough to reduce the viscosity of the organic solvent 24.

Since this image formation is simple due to heat of low energy enough to reduce the magnetism and the viscosity of the organic solvent, recording is easy. Further, by controlling the particle size of the microcapsules, it is possible to form an image with high resolution. Also, since the pigment has a high refractive index, it is possible to hide the color of the magnetic powder when the magnetic powder is attracted to the back surface of the display. Further, the image formed by the thermal / magnetic head device 27 with a heating function has good recording stability because the viscosity of the organic solvent rises at the same time as the organic solvent returns to room temperature, and the fluidity is lowered to a fixed state. Since image formation cannot be performed only by magnetism except in the state, fogging does not occur when the magnet is touched. The display according to the present invention has the mobility of the magnetic powder contained therein at the time of recording, that is, both the good recording reactivity and the stability of the recorded image. Further, since the magnetic powder can move only in the portion of the organic solvent that has become fluidized by heating, an image with high resolution can be obtained.

Furthermore, since the microcapsules can be made into a coating liquid by mixing with a binder, they can be applied to various supports and can be processed into various shapes, and the manufacturing process is simple. Therefore, the range of applications can be expanded. In particular, when applied on paper, it can be used as information recording paper for household faxes and the like, and can be used as recycled paper because printing and erasing can be performed easily and reversibly by applying heat and magnetism.

Next, FIG. 6 shows a magnetic display device 2 of the present invention, which has a heating function on the surface, that is, the display screen side, as the image recording means of the magnetic display 1 as shown in FIGS. A recording heat / magnetic head drive unit 31 in which a plurality of heat / magnetic head devices 30, which are magnetism generating means, are arranged, and a back surface, that is, a surface opposite to the display screen, that is, heat generating means having a magnetism generating function. An erasing heat / magnetic head drive unit 33 in which a plurality of magnetic head devices 32 are arranged is provided. The thermal / magnetic head devices 30 and 31 are ordinary magnetic heads to which heating means such as a heater is added. The heating means is an organic solvent 24.
It suffices that it has a heating ability enough to reduce the viscosity. For example, a permanent magnet having a heater function may be selectively brought close to the surface of the magnetic display display 1.

The recording thermal / magnetic head drive unit 31 corresponds to each thermal / magnetic head device 30 based on the display data obtained by processing the display image data by the control means 34.
To operate. As a result, a predetermined portion of the magnetic display 1 is heated and a magnetic field is applied, and the recording thermal / magnetic head drive unit 31 is moved on the magnetic display 1 by a moving device (not shown) to record an image. Is. The recording thermal / magnetic head drive unit 31 uses one or more thermal / magnetic head devices 30 as a mechanism for moving the thermal / magnetic head drive unit in the main scanning direction and the sub-scanning direction. The display 1 may be scanned in the main scanning direction and the sub-scanning direction for recording.

Similarly, the erasing thermal / magnetic head drive unit 33 also operates the thermal / magnetic head devices 32 by the control means 34 to heat the erased portion of the magnetic display 1 to apply magnetism and not shown. The moving device moves the erasing thermal / magnetic head drive unit 33 on the magnetic display 1 to erase an image.
In addition to the entire erasing by moving the erasing heat / magnetic head drive unit 33 in the main scanning direction of the magnetic display 1, the same structure as the recording heat / magnetic head drive unit 31 is used to partially erase the display. It can also be possible.

[0042]

INDUSTRIAL APPLICABILITY The magnetic display and magnetic display device of the present invention have a viscosity of 200 cps or more at room temperature in which magnetic powder and pigment are dispersed and a viscosity of 1 when heated.
It has a magnetic display layer containing microcapsules encapsulating an organic solvent having a rate of 00 cps or less, and in a non-recording state, magnetic powder is attracted to the back surface which is one surface of the magnetic display, and the other surface is the other surface. The surface of the magnetic display shows a uniform color tone due to the color of the pigment.The recording state is scanned from the surface side of the magnetic display by a thermal / magnetic head device having a heating means, and the magnetic field is applied by heating and applying magnetism. The powder moves to the surface side of the magnetic display, forming a black image of the magnetic powder. In addition, erasing is performed by heating the entire surface and applying magnetism from the back surface of the magnetic display to the entire surface, or by scanning the back surface of the magnetic display display with heating and applying magnetism, the magnetic powder is attracted below the microcapsules, The surface of the magnetic display becomes the color of the pigment again and the image can be erased.

That is, in the magnetic display and the magnetic display device of the present invention, the portion to which magnetism is applied has a distinct brightness and darkness different from the portion to which no magnetism is applied, and has high resolution.
It is clear and has excellent effects such as excellent image stability.

In the present invention, since image formation can be easily performed by heating at low temperature and applying magnetism, the energy consumption is low, and the particle size of the microcapsules can be controlled by using the microcapsules in the recording layer. By doing so, the resolution can be increased. Moreover, since magnetic powder, pigment, etc. are dispersed in an organic solvent having a viscosity of 200 cps or more at room temperature and a viscosity of 100 cps or less at the time of heating in the microcapsules, the viscosity is high and the fluidity is low except when recording. Therefore, even if a magnet such as a magnet is applied from the outside after recording the information, the magnetic powder in the microcapsule does not move, and stable recording can be obtained. In addition, since the area affected by magnetism does not spread by encapsulating microcapsules, the movement of magnetic powder can be almost limited only to the part where heating and magnetism are applied, so an organic solvent that has high resolution and low fluidity at room temperature By using, the image stability is also excellent.

Further, since the step of applying the coating liquid containing the microcapsules can be applied, the manufacturing steps of the magnetic display can be simplified.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a magnetic recording body of the present invention.

FIG. 2 is a cross-sectional view showing an example of microencapsulated magnetic particles used for a recording layer in the present invention.

FIG. 3 is an explanatory view showing a state at the time of manufacturing the magnetic recording body of the present invention.

FIG. 4 is an explanatory diagram showing a non-recorded state by an erasing operation of the magnetic recording body of the present invention.

FIG. 5 is an explanatory diagram showing a recording state of the magnetic recording medium of the present invention.

FIG. 6 is a magnetic display device of the present invention.

FIG. 7 is an explanatory diagram illustrating a configuration of a recording thermal / magnetic head drive unit of the magnetic display device of the present invention.

FIG. 8 is an explanatory diagram illustrating a configuration of an erasing thermal / magnetic head drive unit of the magnetic display device of the present invention.

[Explanation of symbols]

1 Display for Magnetic Display 2 Magnetic Display Device 11 Support 12 Magnetic Display Layer 13 Protective Support 14 Microcapsule 15 Binder 21 Core Material 22 Magnetic Powder 23 Pigment 24 Viscosity at Room Temperature is 200 cps or More and Viscosity at Heating is 100 cps or Less Certain organic solvent 25 Shell substance 27 Thermal / magnetic head device 30, 32 Thermal / magnetic head device 31 Recording thermal / magnetic head drive unit 33 Erasing thermal / magnetic head drive unit 34 Control means

Claims (6)

[Claims] 1. At least one of a magnetic powder and a pigment is dispersed between supports, at least one of which is made of a non-magnetic material having transparency, and has a viscosity of 200 c at room temperature.
A magnetic display layer comprising a magnetic display layer comprising microcapsules containing an organic solvent having a viscosity of 100 cps or more and a viscosity of 100 cps or less when heated and dispersed in a binder. 2. The average particle size of the microcapsules is 10 μm.
To 1000 μm. 3.
Display for magnetic display as described. 3. The average particle diameter of the magnetic powder is 0.1 μm to 10 μm.
The display for magnetic display according to claim 1, wherein the display is in the range of μm. 4. The pigment has an average particle size of 0.01 μm to 10 μm.
The display for magnetic display according to claim 1, wherein the display is in the range of μm. 5. The magnetic display according to claim 1, wherein the pigment has a refractive index of 1.5 or more. 6. A viscosity of 200 c at room temperature, which is obtained by dispersing at least a magnetic powder and a pigment between supports, at least one of which is made of a non-magnetic material having transparency.
a magnetic display for forming a magnetic display layer in which microcapsules containing an organic solvent having a viscosity of 100 ps or more and a viscosity at heating of 100 cps or less are dispersed and arranged in a binder; A heating magnetism generating unit disposed on the display surface side and partially attracting and moving the magnetic powder in the microcapsules by heating and magnetic application, and disposed on the back surface side of the magnetic display, and by heating and magnetic application And a heating magnetism generating means for attracting and moving the magnetic powder in the microcapsules,
A magnetic display device characterized in that the magnetic powder in the microcapsules is unevenly distributed on one surface.