JPH047518B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnet inversion display magnetic panel.

Conventional technology Conventionally, magnetic inversion display magnetic panels that perform display using magnetic force have a structure in which micromagnets for inversion display are dispersed in a liquid dispersion medium, and this dispersion medium is enclosed between two substrates. I was taking it. However, in such conventional magnetic reversal display magnetic panels, micro magnets for reversing display are dispersed in a dispersion medium such as a liquid, so these micro magnets attract each other and coagulate, resulting in poor display. It was difficult to obtain. Also, if the panel is violently vibrated, the tiny magnets that were displayed will move in the liquid.
A clear display could not be obtained. Therefore, in the past, in order to obtain as clear a display as possible, the magnetic properties of the micro magnet for reversing display and the various properties of the dispersion medium had to be strictly selected, and there were considerable restrictions in these respects. It was hot.

Furthermore, in order to reduce disturbances caused by agglomeration and vibration in the dispersion medium, it has been proposed to create a multi-cell structure in the space between two substrates and to encapsulate a micro-magnet for reverse display in each cell. ing. However, in such a conventional multi-cell structure, the partition walls for each cell are visible from the front, making the desired display unsightly. Moreover, with this conventional multi-cell structure, it was difficult to manufacture cells of various shapes.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a magnet reversal display magnetic panel that can solve the problems of the prior art as described above, can always provide a clear display, and can be formed into any shape. .

Structure of the Invention The magnet inversion display magnetic panel according to the present invention includes a dispersion liquid sealed in a spherical coating material, in which N-S poles are magnetized in the front and back directions, and N and S poles are magnetized in the front and back directions.
A plurality of minute microcapsules made by dispersing minute magnetic powder having a flat plate shape and a particle size of 10 to 250μ with different colors depending on the poles are arranged in a matrix on a substrate, and the minute microcapsules are attached to the substrate. The microcapsules are fixed with a binder resin so that the micromagnetic powder inside the microcapsules can be accurately reversed in accordance with the polarity of the display driving magnetic field.

Embodiments Next, the present invention will be described in more detail with reference to embodiments of the present invention based on the accompanying drawings.

FIG. 1 is a partial schematic sectional view showing a magnet inversion display magnetic panel as an embodiment of the present invention. As shown in FIG. 1, this magnet inversion display magnetic panel has a base 1 made of paper, plastics, metals, etc., and N-S poles are magnetized in the front and back directions, and N and S poles are magnetized. A microcapsule array body 4 is provided in which a plurality of microcapsules 3 encapsulating fine magnetic powders 2 of different colors are arranged in a matrix on a base body 1. Microcapsule array 4
is fixed onto the base 1 using a binder resin 5 or the like.

FIG. 2 shows an enlarged perspective view of one particle of the fine magnetic powder 2 enclosed within the microcapsule 3. The micro magnet powder 2 of this example has a micro flat plate shape, the front side 2A and the back side 2B have different colors, and the N-S poles are magnetized in the front and back directions. In this example, the front side 2A is a white layer, and the back side 2B is a black magnetic layer.

To explain the manufacturing method of such micro magnetic powder, two types of paints of different colors containing a magnetic material on at least one side are prepared, two layers of different colors are formed, and the sheet is exposed to a certain magnetic field. A magnetic vector is applied to the magnetic material layer to magnetize the N-S poles, and the sheet is then ground into a large number of fine powders. As the magnetic material used here, ferrite, metal, rare earth cobalt, etc. can be used, and it is possible to use them alone or in combination of two or more kinds. Ferrite includes barium ferrite, strontium ferrite, cobalt ferrite, lead ferrite, etc. Magnetite, gamma iron oxide, chromium dioxide, etc. can also be used. Metals include iron, cobalt, chromium, etc. Rare earth cobalt includes samarium cobalt, yttrium, etc. Examples include cobalt and cerium cobalt.

Experiments were conducted by forming various types of micromagnetic powder, and it was found that if the particle diameter of the micromagnetic powder was smaller than μ, it would be difficult to properly invert according to the polarity of the display driving magnetic field, and if the particle size was too large. It was found that the particle size of the fine magnet powder was preferably in the range of 10μ to 250μ.

FIG. 3 shows an enlarged view of one of the microcapsules 3 in which such minute magnetic powder 2 is enclosed. In the microcapsule 3 of this embodiment, a liquid substance 6 is enclosed in a spherical film substance 7, and minute magnetic powder 2 is dispersed in the liquid substance 6. The method of forming such microcapsules itself may be a well-known method, such as "Microcapsule" written by Asashi Kondo, published by Nikkan Kogyo Shimbunsha, 1970, "Microcapsule" written by Tamotsu Kondo and Masumi Koishi, The methods disclosed in Mitsui Publishing Co., Ltd., 1977 may be used, such as simple coacervation method, complex coacervation method, interfacial polymerization method, in-situ polymerization method,
Various methods are possible, such as the in-liquid hardening film method, spray drying method, inorganic wall method, phase separation method, and interfacial precipitation method. Encapsulation can be performed.

Next, specific examples of the present invention will be described below.

Example 1 Fine magnetic powder was produced by a method similar to that described above. That is, a white paint was prepared by dispersing a white pigment in a methyl ethyl ketone solution of an epoxy resin, and a black magnetic paint was prepared by dispersing barium ferrite powder and carbon black in the same methyl ethyl ketone solution. These two kinds of paints were applied to a polyethylene film in two layers, and after drying, the black side was magnetized as a north pole and the white side as a south pole, peeled off from the polyethylene film, and crushed to obtain fine magnetic powder.

A liquid is prepared by dispersing this fine magnetic powder in liquid paraffin, this liquid is emulsified and dispersed in an aqueous gelatin solution, this emulsion is dispersed in an aqueous gum arabic solution, and formalin is added while stirring to form a liquid paraffin. Microcapsules with dispersed micromagnetic powder at their core are generated. The microcapsules were dried, dispersed in an aqueous resin material, and coated on the surface of paper as a substrate to make a magnetic inversion display magnetic panel.

Example 2 Fine magnetic powder produced in the same manner as in Example 1 was dispersed in dichlorodiphenyl, and 10:1 of styrene-divinylbenzene mono was added as a monomer to this liquid.
1 mixture and benzoyl peroxide as a catalyst. This liquid is emulsified and dispersed in an aqueous solution of gum arabic. By heating this dispersion liquid at 80° C. for 6 hours while stirring, the polymer polymerized and precipitated on the surface of the droplets to form a film and obtain microcapsules. In the same manner as in Example 1, this was coated on the surface of paper as a substrate to obtain a magnetic reversal display magnetic panel.

In the above embodiment, paper was used as the substrate, but if a magnetic reversal display magnetic panel is manufactured by fixing microcapsules to a flexible substrate such as plastic film, then Since the capsule array is a collection of minute microcapsules, it can exhibit similar flexibility, so it can also be used as a bendable magnetic reversal display magnetic panel. Further, by fixing it in a folded state, it can be used as a magnet reversal display magnetic panel having a curved display surface.

Effects of the Invention The magnet inversion display magnetic panel according to the present invention has a plurality of microcapsules fixed on a base with a binder resin, so it is very easy to create compartments for packaging micromagnetic powder. It can be easily miniaturized, and therefore, there is no possibility that the fine magnetic powder attracts each other and causes aggregation, and a clear and good display can always be made, and the display can be completely erased. can also be easily done. Moreover, the uninvented magnet reversal display magnetic panel inverts easily reversible microscopic magnetic powders with a particle size of 10 to 250μ in microscopic microcapsules, and performs display based on the difference in color between the front and back sides of these micromagnetic powders. Therefore, the device can be simple, provide stable display, and be inexpensive. Also,
Since the magnet reversal display magnetic panel according to the present invention performs display using a microcapsule array,
It can be used not only for displaying records indoors, but also outdoors and underwater, and can also be applied to games and the like. Furthermore, since the magnet inversion display magnetic panel according to the present invention can have any shape such as a flat plate shape, a curved shape, and a flexible shape, it can be suitable for a wide variety of displays.

[Brief explanation of drawings]

FIG. 1 is a partial schematic sectional view showing a magnet reversal display magnetic panel as an embodiment of the present invention, and FIG. 2 is an enlarged perspective view showing an example of minute magnet powder used in the magnet reversal display magnetic panel of FIG. 1. , FIG. 3 is an enlarged view showing microcapsules used in the magnet inversion display magnetic panel of FIG. 1. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Micro magnetic powder, 3... Microcapsule, 4... Microcapsule array, 5
... Binder resin, 6 ... Liquid substance, 7 ... Film material.

Claims (1)

[Claims] 1. A dispersion liquid is sealed in a spherical coating material, and N-S poles are magnetized in the front and back directions in the dispersion liquid, and N-S poles are magnetized in the front and back directions.
Plate-shaped with different colors at the pole and south pole, grain size 10~
A plurality of minute microcapsules made by dispersing minute magnetic powder having a diameter of 250μ are arranged in a matrix on a substrate, and the minute microcapsules are fixed to the substrate with a binder resin, and the inside of the minute microcapsules is 1. A magnet reversal display magnetic panel characterized in that minute magnet powder can be accurately reversed according to the polarity of a display driving magnetic field. 2. The magnetic inversion display magnetic panel according to claim 1, wherein the base body is flat. 3. The magnetic inversion display magnetic panel according to claim 1, wherein the base has a curved shape. 4. The magnetic inversion display magnetic panel according to claim 1, wherein the base is flexible.