Microcapsule magnetophoresis display system

Abstract

To achieve a magnetic erasing tool that can erase an erasure target within an accurate range, a magnetic erasing tool enlarging a freedom degree of a size of the magnetic erasing tool adapted to a microcapsule magnetophoresis display size, and combines the magnetic erasing tool having the freedom degree thereof enlarged and a magnetic writing instrument.SOLUTION: A magnetic erasing tool for scanning a recording surface of a microcapsule magnetophoresis display, and erasing a magnetic recording display body displayed on the microcapsule magnetophoresis display is configured to: use a multipolar magnetization rubber magnet 2 as erasure means; set one surface of the multipolar magnetization rubber magnet 2 as an erasing surface side 3 scanning the recording surface of the microcapsule magnetophoresis display to erase the magnetic recording display body displayed on the recording surface; and control density of magnetic force lines coming from the erasing surface side 3 to be magnetic force suitable for aggregating a magnetic particle within a microcapsule to a center of the microcapsule.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a microcapsule magnetophoresis display system including a magnetic eraser for erasing a magnetic recording display body of black characters or images displayed by applying a magnetic field to a microcapsule magnetophoresis display by scanning the surface of the recording surface, and a magnetic writing instrument for describing black characters or images displayed by applying a magnetic field to the microcapsule magnetophoresis display.

Background Art

[0002] As a magnetic eraser for erasing a magnetic recording display body of black characters or images displayed by applying a magnetic field to a microcapsule magnetophoresis display from the surface side of the recording surface, Patent Document 1 discloses a magnetic eraser that rotates a magnet inside a housing.

[0003] Patent Document 2 discloses a magnetic eraser in which a magnet and a magnetic body are arranged inside a housing, and the magnetic body controls the intensity and direction of magnetic force lines from the magnet.

[0004] Patent Document 3 discloses a magnetic eraser that rotates a magnet as in Patent Document 1, and a magnetic eraser that arranges a plurality of magnets inside a housing to control the direction of magnetic force lines.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] In Patent Document 1, by rotating a magnet at a constant speed, the direction of magnetic field lines is continuously rotated. Accordingly, magnetic particles inside the microcapsules of the microcapsule electrophoresis display rotate and aggregate, so that black magnetic particles can be collected near the center of the microcapsules, and excellent erasing performance can be obtained. On the other hand, a driving member for rotating the magnet is required, and there are problems of increased weight and cost of the magnetic eraser. When a motor is driven by a battery, the microcapsule electrophoresis display system combined with this magnetic eraser cannot be said to be a 100% ecological product.

[0007] In Patent Document 2, since the intensity and direction of magnetic field lines are controlled by arranging magnetic bodies without rotating the magnet, compared with the magnetic eraser of Patent Document 1, although weight reduction, cost reduction, and ecological improvement have been achieved, the erasing performance is inferior to that of the magnetic eraser of Patent Document 1.

[0008] Furthermore, since the magnetic eraser of Patent Document 2 arranges magnets and magnetic bodies in the internal space of the housing structure, there is a problem that the degree of freedom in the size of the magnetic eraser is low.

[0009] In Patent Document 3, in order to improve the erasing performance, which is a problem of the magnetic eraser of Patent Document 2, a plurality of magnets are arranged in the housing perpendicular to the scanning direction of the magnetic eraser. When the magnetic eraser is scanned, the S pole and the N pole alternate, intending to achieve erasing performance equivalent to that of Patent Document 1 without rotating the magnet. However, when a plurality of magnets are arranged side by side in the housing, the direction, intensity, and reach distance of the magnetic field lines generated from the magnets are greatly different between the adjacent parts of the magnets and the ends without adjacent magnets. Therefore, it is necessary to control the intensity and direction of the magnetic field lines by arranging magnetic bodies as in Patent Document 2. Therefore, the latter magnetic eraser of Patent Document 3 requires not only the use of a plurality of magnets but also the arrangement of magnetic bodies. In addition to increasing the weight and cost of the magnetic eraser, there is a problem that the degree of freedom in the shape and size of the magnetic eraser is greatly limited.

[0010] Since the magnetic erasers of Patent Documents 1 to 3 use permanent magnets, even if a magnetic material is arranged to control the intensity and direction of magnetic field lines, the magnetic field lines extend over a wide range. Therefore, in the case of partial erasure, it has been difficult to erase the erasure target within an accurate range.

[0011] In order to solve such problems, the inventors of the present invention repeated experimental studies and focused on using a multi-pole magnetized rubber magnet as the magnet used in the magnetic eraser.

[0012] Multi-pole magnetized rubber magnets are used in many products and distributed under names such as rubber magnets, magnet sheets, plastic magnets, and magnet belts. There are differences in the types of multi-pole magnetized rubber magnets in terms of isotropy, anisotropy, thickness, and magnetization pitch (the distance between the S pole and the N pole). Generally, the magnetic force becomes stronger as the anisotropy and thickness increase compared to isotropy, and the range affected by the magnetic field lines changes according to the magnetization pitch. Since the magnetic field lines emerge from adjacent N poles and enter the S pole, as the magnetization pitch widens in proportion to the magnetization pitch, the density of the magnetic field lines does not decrease far from the multi-pole magnetized rubber magnet.

[0013] When the recording surface of the microcapsule electrophoresis display is scanned so that the magnetization direction of the multi-pole magnetized rubber magnet is perpendicular to the traveling direction, the magnetic particles in the microcapsules line up in a needle shape along the magnetic field lines and rotate as the S pole and the N pole pass alternately. Then, the magnetic particles in the microcapsules after the multi-pole magnetized rubber magnet has passed aggregate due to residual magnetization.

[0014] As a result of the experimental studies, when the multi-pole magnetized rubber magnet is scanned along the surface of the recording surface of the microcapsule electrophoresis display, when the magnetic force of the multi-pole magnetized rubber magnet is high, the magnetic particles in the microcapsules rotate but are attracted by the magnetic force and aggregate near the surface of the display, resulting in a black recording surface. When the magnetic force is low, it was found that the magnetic particles in the microcapsules are not attracted by the magnetic force and the recording surface of the display becomes white.

[0015] By controlling the magnetic force of the multi-pole magnetized rubber magnet to the magnetic force that aggregates the magnetic particles in the microcapsules near the center of the microcapsules, it has been found that the magnetic recording display body of the black characters or images displayed by applying a magnetic field to the microcapsule electrophoresis display can be erased, and the present invention has been completed.

[0016] An object of the present invention is to provide a magnetic eraser that can erase an erasure target within an accurate range, maintain excellent erasure performance, weight reduction, and ecological properties, further reduce costs, and expand the degree of freedom in the size of the magnetic eraser suitable for the size of the microcapsule electrophoresis display, and a microcapsule electrophoresis display system combining this magnetic eraser and a magnetic writing instrument.

Means for Solving the Problems

[0017] To achieve the above object, the invention according to claim 1 is a magnetic eraser for scanning the surface of the recording surface of a microcapsule electrophoresis display and erasing the magnetic recording display body of black characters or images displayed by applying a magnetic field to the microcapsule electrophoresis display. As an erasing means, a multi-pole magnetized rubber magnet is used, and one surface of the multi-pole magnetized rubber magnet is set as an erasing surface side for scanning the surface of the recording surface of the microcapsule electrophoresis display and erasing the magnetic recording display body displayed on the surface of the recording surface, and the density of the magnetic force lines emerging from the erasing surface side is controlled to a magnetic force suitable for aggregating the magnetic particles in the microcapsules at the center of the microcapsules.

[0018] According to the invention described in claim 1, a multi-pole magnetized rubber magnet is used as the erasing means, and one surface of the multi-pole magnetized rubber magnet is set as the erasing surface side for scanning the surface of the recording surface of the microcapsule electrophoresis display to erase the magnetic recording display body displayed on the surface of the recording surface. Since the density of the magnetic flux lines emerging from the erasing surface side is controlled to a magnetic force suitable for aggregating the magnetic particles in the microcapsules at the center of the microcapsules, when the surface of the recording surface of the microcapsule electrophoresis display is scanned on the erasing surface side set for the multi-pole magnetized rubber magnet, the magnetic particles in the microcapsules after the multi-pole magnetized rubber magnet has passed will be aggregated near the center of the microcapsules due to residual magnetization, and the surface of the recording surface will become white, thus being able to erase the black characters or image magnetic recording display body displayed on the surface of the recording surface.

[0019] Also, since a multi-pole magnetized rubber magnet is used as the erasing means, it is possible to obtain a magnetic erasing tool that maintains weight reduction and ecological properties, further reduces costs, and expands the degree of freedom in the size of the magnetic erasing tool suitable for the size of the microcapsule electrophoresis display.

[0020] The invention described in claim 2 is characterized in that, in the invention described in claim 1, the magnetized surface of the multi-pole magnetized rubber magnet is used as the erasing surface side, and a spacer layer made of a non-magnetic material is provided on the erasing surface side as control means for controlling the density of the magnetic flux lines emerging from the erasing surface side to a magnetic force suitable for aggregating the magnetic particles in the microcapsules at the center of the microcapsules.

[0021] According to the invention described in claim 2, the magnetized surface of the multi-pole magnetized rubber magnet is on the erasing surface side, and as control means for controlling the density of magnetic field lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsules at the center of the microcapsules, a spacer layer made of a non-magnetic material is provided on the erasing surface side. Therefore, the spacer layer made of a non-magnetic material reduces the density of magnetic field lines emerging from the erasing surface side, and by a simple means such as changing the thickness of the spacer layer, the density of magnetic field lines emerging from the erasing surface side can be controlled to a magnetic force suitable for aggregating magnetic particles near the center of the microcapsules.

[0022] The invention described in claim 3 is characterized in that, as control means for making the magnetized surface of the multi-pole magnetized rubber magnet described in claim 1 face the erasing surface side and controlling the density of magnetic field lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsules at the center of the microcapsules, a spacer layer made of a magnetic material is provided on the erasing surface side.

[0023] According to the invention described in claim 3, the magnetized surface of the multi-pole magnetized rubber magnet is on the erasing surface side, and as control means for controlling the density of magnetic field lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsules at the center of the microcapsules, a spacer layer made of a magnetic material is provided on the erasing surface side. Therefore, since magnetic field lines pass through the spacer layer made of a magnetic material, the density of magnetic field lines emerging from the erasing surface side is reduced, and by a simple means such as changing the thickness of the spacer layer, the density of magnetic field lines emerging from the erasing surface side can be controlled to a magnetic force suitable for aggregating magnetic particles near the center of the microcapsules.

[0024] The invention described in claim 4 is characterized in that, as control means for making the magnetized surface of the multi-pole magnetized rubber magnet described in claim 1 face the erasing surface side and controlling the density of magnetic field lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsules at the center of the microcapsules, a spacer layer made of a magnetic material and a non-magnetic material is provided on the erasing surface side.

[0025] According to the invention described in claim 4, as control means for controlling the density of magnetic flux lines emerging from the erasure surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsule at the center of the microcapsule, a spacer layer made of a magnetic material and a non-magnetic material is provided on the erasure surface side of the multi-pole magnetized rubber magnet. Therefore, by controlling the thickness of each spacer layer made of a magnetic material and a non-magnetic material, the density of magnetic flux lines emerging from the erasure surface side can be controlled to a magnetic force suitable for aggregating magnetic particles near the center of the microcapsule.

[0026] The invention described in claim 5 is characterized in that, in the invention described in claim 1, the multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, with the non-magnetized surface on the erasure surface side, and as control means for controlling the density of magnetic flux lines emerging from the erasure surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsule at the center of the microcapsule, the thickness of the single-sided multi-pole magnetized rubber magnet is selected and set.

[0027] According to the invention described in claim 5, the multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, with the non-magnetized surface on the erasure surface side, and as control means for controlling the density of magnetic flux lines emerging from the erasure surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsule at the center of the microcapsule, the thickness of the single-sided multi-pole magnetized rubber magnet is selected and set. Therefore, by a simple means such as selecting and setting the thickness of the single-sided multi-pole magnetized rubber magnet, the density of magnetic flux lines emerging from the erasure surface side can be controlled to a magnetic force suitable for aggregating magnetic particles near the center of the microcapsule.

[0028] The invention described in claim 6 is characterized in that, in the invention described in claim 1, the multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, with the non-magnetized surface on the erasure surface side, and as control means for controlling the density of magnetic flux lines emerging from the erasure surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsule at the center of the microcapsule, the magnetization pitch of the single-sided multi-pole magnetized rubber magnet is selected and set.

[0029] According to the invention described in claim 6, the multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, with the non-magnetized surface on the erasing surface side. As control means for controlling the density of magnetic flux lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsules at the center of the microcapsules, the magnetization pitch of the single-sided multi-pole magnetized rubber magnet is selected and set. Therefore, the density of magnetic flux lines can be adjusted by a simple means such as selecting the magnetization pitch of the single-sided multi-pole magnetized rubber magnet, and the density of magnetic flux lines emerging from the erasing surface side can be controlled to a magnetic force suitable for aggregating magnetic particles near the center of the microcapsules.

[0030] The invention described in claim 7 is characterized in that, in the invention described in claim 1, the multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, with the non-magnetized surface on the erasing surface side, and a spacer layer made of a non-magnetic material is provided on the erasing surface side as control means for controlling the density of magnetic flux lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsules at the center of the microcapsules.

[0031] According to the invention described in claim 7, the non-magnetized surface of the single-sided multi-pole magnetized rubber magnet is on the erasing surface side, and a spacer layer made of a non-magnetic material is provided on the erasing surface side as control means for controlling the density of magnetic flux lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsules at the center of the microcapsules. Therefore, the spacer layer made of a non-magnetic material reduces the density of magnetic flux lines emerging from the erasing surface side, and by a simple means such as changing the thickness of the spacer layer, the density of magnetic flux lines emerging from the erasing surface side can be controlled to a magnetic force suitable for aggregating magnetic particles near the center of the microcapsules.

[0032] The invention described in claim 8 is characterized in that, in the invention described in claim 1, the multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, with the non-magnetized surface on the erasing surface side, and a spacer layer made of a magnetic material is provided on the erasing surface side as control means for controlling the density of magnetic flux lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsules at the center of the microcapsules.

[0033] According to the invention described in claim 8, with the non-magnetized surface of the one-sided multi-pole magnetized rubber magnet being on the erasing surface side, as control means for controlling the density of magnetic flux lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsule at the center of the microcapsule, a spacer layer made of a magnetic material is provided on the erasing surface side. Thus, magnetic flux lines pass through the spacer layer made of a magnetic material, reducing the density of magnetic flux lines emerging from the erasing surface side. By a simple means such as changing the thickness of the spacer layer, the density of magnetic flux lines emerging from the erasing surface side can be controlled to a magnetic force suitable for aggregating magnetic particles near the center of the microcapsule.

[0034] The invention described in claim 9 is characterized in that, as described in claim 1, the multi-pole magnetized rubber magnet is a one-sided multi-pole magnetized rubber magnet, with the non-magnetized surface on the erasing surface side, and as control means for controlling the density of magnetic flux lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsule at the center of the microcapsule, a spacer layer made of a magnetic material and a non-magnetic material is provided on the erasing surface side.

[0035] According to the invention described in claim 9, with the non-magnetized surface of the one-sided multi-pole magnetized rubber magnet being on the erasing surface side, as control means for controlling the density of magnetic flux lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsule at the center of the microcapsule, a spacer layer made of a magnetic material and a non-magnetic material is provided on the erasing surface side. Thus, by controlling the thickness of each spacer layer made of a magnetic material and a non-magnetic material, the density of magnetic flux lines emerging from the erasing surface side can be controlled to a magnetic force suitable for aggregating magnetic particles near the center of the microcapsule.

[0036] The invention described in claim 10 is characterized in that, as described in any one of claims 5 to 9, the multi-pole magnetized rubber magnet is a one-sided multi-pole magnetized rubber magnet, and a magnetic material is installed on the magnetized surface.

[0037] According to the invention described in claim 10, the multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, and a magnetic material is installed on the magnetized surface. Therefore, when the magnetic force of the single-sided multi-pole magnetized rubber magnet is weak, the magnetic force coming out from the non-magnetized surface can be strengthened. Even when the magnetic force is strengthened, the density of the magnetic lines of force coming out from the erasing surface side can be controlled to a magnetic force suitable for aggregating magnetic particles near the center of the microcapsule by controlling the thickness of the spacer layer.

[0038] The invention described in claim 11 is characterized in that, in the multi-pole magnetized rubber magnet according to any one of claims 1 to 10, the ends on both sides in the scanning direction are curved in a direction away from the surface of the recording surface of the microcapsule electrophoresis display.

[0039] According to the invention described in claim 11, although the density and direction of the magnetic lines of force are disturbed at the ends on both sides in the scanning direction due to the cutting of the multi-pole magnetized rubber magnet, since the ends on both sides in the scanning direction of the multi-pole magnetized rubber magnet are curved in a direction away from the surface of the recording surface of the microcapsule electrophoresis display, the ends where the density and direction of the magnetic lines of force are disturbed cannot be used as the erasing surface side. Therefore, the surface of the recording surface of the microcapsule electrophoresis display becomes an erasing surface with a more uniform color tone.

[0040] The invention described in claim 12 is characterized in that one or more of each of the multi-pole magnetized rubber magnets provided with control means for controlling the density of the magnetic lines of force coming out from the erasing surface side according to any one of claims 1 to 11 and the erasing non-functional multi-pole magnetized rubber magnets that do not have control means and make the surface of the recording surface black by scanning the surface of the recording surface are arranged in parallel in the magnetization direction.

[0041] According to the invention described in claim 12, the multi-pole magnetized rubber magnet is provided with control means for controlling the density of magnetic field lines emerging from the erasure surface side described in any one of claims 1 to 11, and an erasure-inactive multi-pole magnetized rubber magnet that does not have control means and makes the surface of the recording surface black by scanning the surface of the recording surface are arranged in parallel, each with one or more in the direction parallel to the magnetization direction. Therefore, by scanning the surface of the recording surface, the magnetic particles are activated by the erasure-inactive multi-pole magnetized rubber magnet and the surface of the recording surface is made black, and the black color of the surface of the recording surface can be erased by the multi-pole magnetized rubber magnet provided with control means. Activation of the magnetic particles and erasure of the black color of the surface of the recording surface can be performed in a series of operations.

[0042] The invention described in claim 13 is a microcapsule magnetophoresis display system, comprising a microcapsule magnetophoresis display, a magnetic writing instrument for applying a magnetic field to the microcapsule magnetophoresis display and writing and displaying a magnetic recording display body of black characters or images on the surface of the recording surface, and a magnetic eraser described in any one of claims 1 to 12.

[0043] According to the invention described in claim 13, since it includes a magnetic eraser described in any one of claims 1 to 12, a microcapsule magnetophoresis display, and a magnetic writing instrument for applying a magnetic field and displaying a magnetic recording display body of black characters or images, the magnetic writing instrument writes and displays a magnetic recording display body of black characters or images on the surface of the recording surface of the microcapsule magnetophoresis display, and the operation of erasing the magnetic recording display body displayed on the surface of the recording surface by the magnetic eraser can be performed highly efficiently and without stress.

Advantages of the Invention

[0044] As described above, according to the magnetic eraser of the present invention, by using a multi-pole magnetized rubber magnet, the erasing target can be erased within an accurate range, and the structure of the magnetic eraser can be simplified, the number of components can be reduced, and the cost can be reduced. In addition, since the degree of freedom in the size of the magnetic eraser is expanded, it is possible to provide a magnetic eraser according to the size of the microcapsule magnetic electrophoresis display and the erasing area.

Brief Description of the Drawings

[0045]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0046] The following describes embodiments of the magnetic eraser and the microcapsule magnetic electrophoresis display system according to the present invention, but the present invention is not limited thereto.

[0047] [Magnetic Eraser] FIG. 1 is a cross-sectional explanatory view schematically showing the 1st example of the embodiment of the magnetic eraser according to the present invention and a state of scanning the surface of the recording surface of the microcapsule magnetic electrophoresis display using the 1st example (in the direction of the arrow) and erasing the magnetic recording display body.

[0048] The magnetic eraser 1 of the first example scans the recording surface 102 of the microcapsule magnetophoresis display 101, applies a magnetic field to the microcapsule magnetophoresis display 101, and erases the magnetic recording display body of the black characters or images displayed. As an erasing means, a multi-pole magnetized rubber magnet 2 is used. One surface of the multi-pole magnetized rubber magnet 2 is set as an erasing surface side 3 that scans the recording surface 102 of the microcapsule magnetophoresis display 101 and erases the magnetic recording display body displayed on the recording surface 102. The density of the magnetic field lines emerging from the erasing surface side 3 is controlled to a magnetic force suitable for aggregating the magnetic particles 104 in the microcapsule 103 to the center of the microcapsule 103.

[0049] In the first example, the multi-pole magnetized rubber magnet 2 used as the erasing means is a single-sided multi-pole magnetized rubber magnet 2a, and the magnetized surface 4 is the erasing surface side 3.

[0050] And as a control means for controlling the density of the magnetic field lines emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 in the microcapsule 103 to the center of the microcapsule 103, a spacer layer 5a made of a non-magnetic material is provided on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a.

[0051] By providing a spacer layer 5a made of a non-magnetic material on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a, the spacer layer 5a made of a non-magnetic material becomes a space and reduces the density of the magnetic field lines emerging from the erasing surface side 3. The thickness of the spacer layer 5a made of a non-magnetic material is set to a thickness that can control the density of the magnetic field lines emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsule 103.

[0052] The spacer layer 5a made of a non-magnetic material can also be given other functions by selecting its material. For example, using felt or the like to impart a function of preventing damage to the surface substrate 105 of the microcapsule electrophoresis display 101, using a silicone-treated surface member to impart a function of reducing friction, or using an antistatic member to impart an antistatic function. Further, the spacer layer 5a made of a non-magnetic material may be a frame only around the periphery and the central portion may be a space.

[0053] According to the magnetic eraser 1 of the first example, a spacer layer 5a made of a non-magnetic material is provided on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a, and the thickness of the spacer layer 5a made of a non-magnetic material is such that the density of the magnetic lines of force emerging from the erasing surface side 3 becomes a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103. By controlling the thickness of the spacer layer 5a made of a non-magnetic material, the density of the magnetic lines of force emerging from the erasing surface side 3 can be made into a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103.

[0054] Then, when the recording surface 102 of the microcapsule electrophoresis display 101 is scanned on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a of the magnetic eraser 1, the magnetic particles 104 that had aggregated on the surface side in the microcapsules 103 to form a magnetic recording display body of black characters or images rotate within the microcapsules 103 by the magnetic lines of force emerging from the erasing surface side 3 during the passage of the single-sided multi-pole magnetized rubber magnet 2a. After the single-sided multi-pole magnetized rubber magnet 2a has passed, the magnetic particles 104 are aggregated near the center of the microcapsules 103 by the residual magnetization. As a result, the recording surface 102 becomes a white state, and the magnetic recording display body of black characters or images displayed on the recording surface 102 can be erased (see Fig. 1).

[0055] In the first example, the multi-pole magnetized rubber magnet 2 used as the erasing means is a single-sided multi-pole magnetized rubber magnet 2a. However, even in the case of a double-sided multi-pole magnetized rubber magnet (not shown), the control means for controlling the density of the magnetic flux lines emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 at the center of the microcapsules 103 can be the same as in the first example.

[0056] FIG. 2 is a cross-sectional explanatory view schematically showing a second example of an embodiment of a magnetic eraser according to the present invention and a state in which the recording surface of a microcapsule magnetic electrophoresis display is scanned (in the direction of the arrow) using the second example to erase the magnetic recording display body.

[0057] The magnetic eraser 1 of the second example has no difference in the basic configuration from the magnetic eraser 1 of the first example, and the same components as those in the first example are denoted by the same reference numerals for explanation.

[0058] The difference between the magnetic eraser 1 of the second example and the first example is that, as a control means for controlling the density of the magnetic flux lines emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 at the center of the microcapsules 103, a spacer layer 5b made of a magnetic material is provided on the erasing surface side 3 in the second example.

[0059] By providing a spacer layer 5b made of a magnetic material on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a, not only does the spacer layer 5b made of a magnetic material become a space, but also since the magnetic flux lines pass through the spacer layer 5b made of a magnetic material, the density of the magnetic flux lines emerging from the erasing surface side 3 is reduced. The thickness of the spacer layer 5b made of a magnetic material is set to a thickness that can control the density of the magnetic flux lines emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103.

[0060] The spacer layer 5b made of a magnetic material is not particularly limited in its material. In the lamination means, it may be in the form of a plate or a foil adsorbed by a magnetic force, or may be pasted with an adhesive or a sticky agent. In the case of a thin film, coating or vapor deposition may be used.

[0061] According to the magnetic eraser 1 of the second example, a spacer layer 5b made of a magnetic material is provided on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a. By setting the thickness of the spacer layer 5b made of a magnetic material to a thickness that can be controlled so that the density of the magnetic field lines emerging from the erasing surface side 3 becomes a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103, by controlling the thickness of the spacer layer 5b made of a magnetic material, the density of the magnetic field lines emerging from the erasing surface side 3 can be made into a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103.

[0062] Then, when the recording surface 102 of the microcapsule electrophoresis display 101 is scanned on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a of the magnetic eraser 1, in the same manner as in the first example, the magnetic particles 104 that had aggregated on the surface side in the microcapsules 103 and formed a magnetic recording display of black characters or images rotate within the microcapsules 103 due to the magnetic field lines emerging from the erasing surface side 3 during the passage of the single-sided multi-pole magnetized rubber magnet 2a. After the single-sided multi-pole magnetized rubber magnet 2a has passed, the magnetic particles 104 are aggregated near the center of the microcapsules 103 due to residual magnetization. As a result, the recording surface 102 becomes white, and the magnetic recording display of black characters or images displayed on the recording surface 102 can be erased (see Fig. 2).

[0063] In the second example, the multi-pole magnetized rubber magnet 2 used as the erasing means is a single-sided multi-pole magnetized rubber magnet 2a. However, in the case of a double-sided multi-pole magnetized rubber magnet (not shown), the control means for controlling the density of the magnetic field lines emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 at the center of the microcapsules 103 can be the same as in the second example.

[0064] Fig. 3 is a cross-sectional explanatory view schematically showing the third example of the embodiment of the magnetic eraser according to the present invention and the state of scanning the recording surface of the microcapsule electrophoresis display (in the direction of the arrow) using the third example to erase the magnetic recording display.

[0065] The magnetic eraser 1 of the third example has no difference in the basic configuration from the magnetic erasers 1 of the first and second examples, and the same components as those in the first and second examples will be described with the same reference numerals.

[0066] The difference between the magnetic eraser 1 of the third example and the first and second examples lies in that, as a control means for controlling the density of the magnetic flux lines emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 at the center of the microcapsules 103, in the third example, a spacer layer 5b made of a magnetic material and a spacer layer 5a made of a non-magnetic material are provided on the erasing surface side 3.

[0067] By providing a spacer layer 5b made of a magnetic material and a spacer layer 5a made of a non-magnetic material on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a, the spacer layer 5b made of a magnetic material and the spacer layer 5a made of a non-magnetic material form a space, and the magnetic flux lines pass through the spacer layer 5b made of a magnetic material, so that the density of the magnetic flux lines emerging from the erasing surface side 3 is reduced.

[0068] The thicknesses of the spacer layer 5b made of a magnetic material and the spacer layer 5a made of a non-magnetic material are set to thicknesses that can control the density of the magnetic flux lines emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103.

[0069] The materials of the spacer layer 5b made of a magnetic material and the spacer layer 5a made of a non-magnetic material are the same as those in the first and second examples.

[0070] According to the magnetic eraser 1 of the third example, a spacer layer 5b made of a magnetic material and a spacer layer 5a made of a non-magnetic material are provided on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a. By controlling the thicknesses of the spacer layer 5b made of a magnetic material and the spacer layer 5a made of a non-magnetic material to be a thickness such that the density of the magnetic field lines emerging from the erasing surface side 3 becomes a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103, the density of the magnetic field lines emerging from the erasing surface side 4 can be made into a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103 by controlling the thicknesses of the spacer layer 5b made of a magnetic material and the spacer layer 5a made of a non-magnetic material.

[0071] Then, when the recording surface 102 of the microcapsule electrophoresis display 101 is scanned on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a of the magnetic eraser 1, similar to the first and second examples, the magnetic particles 104 that had aggregated on the surface side within the microcapsules 103 and formed a magnetic recording display body of black characters or images rotate within the microcapsules 103 due to the magnetic field lines emerging from the erasing surface side 3 during the passage of the single-sided multi-pole magnetized rubber magnet 2a. After the single-sided multi-pole magnetized rubber magnet 2a has passed, the magnetic particles 104 are aggregated near the center of the microcapsules 103 by residual magnetization, whereby the recording surface 102 becomes a white state and the magnetic recording display body of black characters or images displayed on the recording surface 102 can be erased (see FIG. 3).

[0072] In the third example, the multi-pole magnetized rubber magnet 2 used as the erasing means is a single-sided multi-pole magnetized rubber magnet 2a. However, even in the case of a double-sided multi-pole magnetized rubber magnet (not shown), the control means for controlling the density of the magnetic field lines emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 at the center of the microcapsules 103 can be the same as in the third example.

[0073] FIG. 4 is a cross-sectional explanatory view schematically showing the fourth example of the embodiment of the magnetic eraser according to the present invention and the state of erasing the magnetic recording display body by scanning the recording surface of the microcapsule electrophoresis display using the fourth example (in the arrow direction).

[0074] The magnetic eraser 1 of the fourth example has the same basic configuration as the magnetic eraser 1 of the first example, and the same components as those in the first example will be denoted by the same reference numerals for explanation.

[0075] The difference between the magnetic eraser 1 of the fourth example and the first example is that the non-magnetized surface 6 of the single-sided multi-pole magnetized rubber magnet 2a is used as the erasing surface side 3, and the thickness of the single-sided multi-pole magnetized rubber magnet 2a is selected and set as a control means for controlling the density of the magnetic flux lines emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 at the center of the microcapsules 103.

[0076] In the fourth example, the thickness of the single-sided multi-pole magnetized rubber magnet 2a is selected, and the thickness of the single-sided multi-pole magnetized rubber magnet 2a is set to a thickness suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103, with the density of the magnetic flux lines emerging from the erasing surface side 3 using the thickness of the surface substrate 105 of the microcapsule magnetophoretic display 101 as a space.

[0077] When the non-magnetized surface 6 of the single-sided multi-pole magnetized rubber magnet 2a is used as the erasing surface side 3, the non-magnetized surface 6 itself of the single-sided multi-pole magnetized rubber magnet 2a serves as the spacer layer 5b made of the magnetic material of the second example, and the surface substrate 105 of the microcapsule magnetophoretic display 101 serves as the spacer layer 5a made of the non-magnetic material of the first example. Thus, the magnetic eraser 1 can be formed simply by selecting the thickness of the single-sided multi-pole magnetized rubber magnet 2a.

[0078] Then, when the recording surface 102 of the microcapsule magnetophoretic display 101 is scanned on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a of the magnetic eraser 1, similar to the first example, the magnetic recording display of the black characters or images displayed on the recording surface 102 can be erased (see FIG. 4).

[0079] FIG. 4 shows the fifth example together with the fourth example of the embodiment of the magnetic eraser according to the present invention.

[0080] The magnetic eraser 1 of the fifth example has the same basic configuration as the magnetic eraser 1 of the fourth example, and the same components will be described with the same reference numerals as in the fourth example.

[0081] The difference between the magnetic eraser 4 of the fifth example and the first example is that the non-magnetized surface 6 of the single-sided multi-pole magnetized rubber magnet 2a is used as the erasing surface side 3, and the magnetic flux density emerging from the erasing surface side 3 is controlled as a control means suitable for aggregating the magnetic particles 104 at the center of the microcapsules 103 by selecting and setting the magnetization pitch of the single-sided multi-pole magnetized rubber magnet 2a.

[0082] In the fifth example, the magnetization pitch of the single-sided multi-pole magnetized rubber magnet 2a is selected, and the magnetization pitch of the single-sided multi-pole magnetized rubber magnet 2a is set to a magnetization pitch suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103 with the magnetic flux density emerging from the erasing surface side 3 using the thickness of the surface substrate 15 of the microcapsule electrophoresis display 101 as a space.

[0083] By selecting a narrow magnetization pitch of the single-sided multi-pole magnetized rubber magnet 2a, the magnetic flux density decreases over a short distance. Therefore, using the thickness of the surface substrate 105 of the microcapsule electrophoresis display 101 as a space, a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103 can be obtained.

[0084] Then, when scanning the recording surface 102 of the microcapsule electrophoresis display 101 on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a of the magnetic eraser 1, similar to the first example, the magnetic recording display of the black characters or images displayed on the recording surface 102 can be erased.

[0085] Also, as a control means for controlling the magnetic flux density emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 at the center of the microcapsules 103, the selection of the magnetization pitch of the single-sided multi-pole magnetized rubber magnet 2a of the fifth example and the selection of the thickness of the single-sided multi-pole magnetized rubber magnet 2a of the fourth example may be used in combination.

[0086] FIG. 5 is a cross-sectional explanatory view schematically showing a sixth example of an embodiment of a magnetic eraser according to the present invention and a state in which the recording surface of a microcapsule magnetic electrophoresis display is scanned (in the direction of the arrow) using the sixth example to erase a magnetic recording display body.

[0087] The magnetic eraser 1 of the sixth example has no difference in the basic configuration from the magnetic eraser 1 of the first example, and the same components as those in the first example are denoted by the same reference numerals for explanation.

[0088] The difference between the magnetic eraser 1 of the sixth example and the first example lies in that the non-magnetized surface 6 of the single-sided multi-pole magnetized rubber magnet 2a is used as the erasing surface side 3.

[0089] In the sixth example, as in the first example, a spacer layer 5a made of a non-magnetic material is provided on the erasing surface side 3 as control means for controlling the density of the magnetic field lines emerging from the erasing surface side 3 to a magnetic field strength suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103.

[0090] According to the magnetic eraser 1 of the sixth example configured as described above, similarly to the first example, the density of the magnetic field lines emerging from the erasing surface side 3 can be made a magnetic field strength suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103, and by scanning the recording surface 102 of the microcapsule magnetic electrophoresis display 101 on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a of the magnetic eraser 1, the magnetic recording display body of the black characters or images displayed on the recording surface 102 can be erased (see FIG. 5).

[0091] FIG. 6 is a cross-sectional explanatory view schematically showing a seventh example of an embodiment of a magnetic eraser according to the present invention and a state in which the recording surface of a microcapsule magnetic electrophoresis display is scanned using the seventh example to erase a magnetic recording display body.

[0092] The magnetic eraser 1 of the seventh example has no difference in the basic configuration from the magnetic eraser 1 of the first example, and the same components as those in the first example are denoted by the same reference numerals for explanation.

[0093] The difference between the magnetic eraser 1 of the seventh example and that of the first example is that, similar to the sixth example, the non-magnetized surface 6 of the single-sided multi-pole magnetized rubber magnet 2a is used as the erasing surface side 3.

[0094] In the seventh example, as a control means for controlling the density of the magnetic flux lines emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103, similar to the second example, a spacer layer 5b made of a magnetic material is provided on the erasing surface side 3.

[0095] According to the magnetic eraser 1 of the seventh example configured as described above, similar to the second example, the density of the magnetic flux lines emerging from the erasing surface side 3 can be made into a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103, and by scanning the recording surface 102 of the microcapsule electrophoresis display 101 on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a of the magnetic eraser 1, the magnetic recording display body of the black characters or images displayed on the recording surface 102 can be erased (see Fig. 6).

[0096] Fig. 7 is a cross-sectional explanatory view schematically showing the eighth example of the embodiment of the magnetic eraser according to the present invention and the state of erasing the magnetic recording display body by scanning the recording surface of the microcapsule electrophoresis display using the eighth example (in the direction of the arrow).

[0097] The magnetic eraser 1 of the eighth example has no change in the basic configuration from the magnetic eraser 1 of the first example, and the same components as those in the first example are denoted by the same reference numerals for description.

[0098] The difference between the magnetic eraser 1 of the eighth example and that of the first example is that, similar to the sixth example, the non-magnetized surface 6 of the single-sided multi-pole magnetized rubber magnet 2a is used as the erasing surface side 3.

[0099] In the eighth example, as a control means for controlling the density of the magnetic flux lines emerging from the erasing surface side 3 to a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103, similar to the third example, a spacer layer 5b made of a magnetic material and a spacer layer 5a made of a non-magnetic material are provided on the erasing surface side 3.

[0100] According to the magnetic eraser 1 of the eighth example configured as described above, similarly to the third example, the density of the magnetic flux lines emerging from the erasing surface side 3 can be made into a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103, and by scanning the recording surface 102 of the microcapsule electrophoresis display 101 on the erasing surface side 3 of the single-sided multi-pole magnetized rubber magnet 2a of the magnetic eraser 1, the magnetic recording display body of the black characters or images displayed on the recording surface 102 can be erased (see Fig. 7).

[0101] Fig. 8 is a cross-sectional explanatory view schematically showing the ninth example of the embodiment of the magnetic eraser according to the present invention and the state of erasing the magnetic recording display body by scanning the recording surface of the microcapsule electrophoresis display using the ninth example (in the direction of the arrow).

[0102] The magnetic eraser 1 of the ninth example has no difference in the basic configuration from the magnetic eraser 1 of the fourth example, and the same reference numerals are used for the same components as in the first example for description. The difference between the magnetic eraser 1 of the ninth example and the fourth example lies in that a magnetic material 7 is provided on the magnetized surface 4.

[0103] According to the magnetic eraser 1 of the ninth example, since the magnetic material 7 is provided on the magnetized surface 4, when the magnetic force of the single-sided multi-pole magnetized rubber magnet is weak, the magnetic force emerging from the non-magnetized surface 6 can be strengthened, and even when the magnetic force is strengthened, the density of the magnetic flux lines emerging from the erasing surface side 3 can be controlled to a magnetic force suitable for aggregating the magnetic particles 104 near the center of the microcapsules 103 by controlling the thickness of the spacer layer 5a.

[0104] Although not shown, as the magnetic eraser 1 of the tenth example, a magnetic material 7 is provided on the magnetized surface 4 of the fifth example, as the magnetic eraser 1 of the eleventh example, a magnetic material 7 is provided on the magnetized surface 4 of the sixth example, as the magnetic eraser 1 of the twelfth example, a magnetic material 7 is provided on the magnetized surface 4 of the seventh example, and as the magnetic eraser 1 of the thirteenth example, a magnetic material 7 is provided on the magnetized surface 4 of the eighth example.

[0105] The effects of the magnetic eraser 1 in Examples 10 to 13 are the same as those of the magnetic eraser 1 in Example 9.

[0106] In Examples 1 to 13 of the above-described embodiments, the multi-pole magnetized rubber magnet 2 used is not particularly limited in its shape and size, and any shape and size that are easy to handle as a magnetic eraser may be used.

[0107] FIG. 9 is a perspective view showing a fourteenth example of an embodiment of the magnetic eraser according to the present invention. The magnetic eraser 1 of the fourteenth example is based on the magnetic eraser 1 of the first example, and the ends on both sides of the scanning direction (arrow direction) of the multi-pole magnetized rubber magnet 2 of the magnetic eraser 1 of the first example are curved in a direction away from the recording surface 102 of the microcapsule magnetic electrophoresis display 101.

[0108] In FIG. 9, the magnetic eraser 1 of the fourteenth example is based on the magnetic eraser 1 of the first example. However, as another example of the magnetic eraser 1 of the fourteenth example, although not shown, it can be based on the magnetic erasers 1 of Examples 2 to 13.

[0109] In the fourteenth example, although the density and direction of the magnetic field lines are disturbed at the ends due to the cutting of the multi-pole magnetized rubber magnet 2, since the ends of the multi-pole magnetized rubber magnet 2 are curved in a direction away from the recording surface 102 of the microcapsule magnetic electrophoresis display 101, the ends where the density and direction of the magnetic field lines are disturbed can be prevented from being used as the erasing surface side 3. Therefore, the recording surface 102 of the microcapsule magnetic electrophoresis display 101 becomes an erasing surface with a more uniform color tone.

[0110] FIGS. 10(A) and (B) are cross-sectional explanatory views schematically showing the fifteenth example of an embodiment of the magnetic eraser according to the present invention and the state of erasing the magnetic recording display body by scanning the recording surface of the microcapsule magnetic electrophoresis display (in the arrow direction) using the fifteenth example.

[0111] In the 15th example, the magnetic eraser 1 includes a multi-pole magnetized rubber magnet 2 having control means for controlling the density of magnetic field lines emerging from the erasing surface side 3 in the 1st to 13th examples, and an erasing non-functional multi-pole magnetized rubber magnet 8 that does not have control means and scans the recording surface 102 of the microcapsule electrophoresis display 101 to make the recording surface 102 black. One or more of each are arranged in parallel in the magnetization direction. In the erasing non-functional multi-pole magnetized rubber magnet 8, a known multi-pole magnetized rubber magnet is used.

[0112] The usage frequency of the microcapsule electrophoresis display 101 is low, and if it is not used for a long time, the mobility of the magnetic particles 104 in the microcapsules 103 may decrease during writing and erasing. In this case, operations such as applying magnetism to the magnetic particles 104 to activate them and improve their mobility are required.

[0113] In the 15th example, since the multi-pole magnetized rubber magnet 2 having control means for controlling the density of magnetic field lines emerging from the erasing surface side 3 and the erasing non-functional multi-pole magnetized rubber magnet 8 that does not have control means and scans the recording surface 102 of the microcapsule electrophoresis display 101 to make the recording surface 102 black are arranged in parallel with one or more of each in the magnetization direction, by scanning the recording surface 102, the magnetic particles 14 in the microcapsules 103 can be activated by the erasing non-functional multi-pole magnetized rubber magnet 8 and the recording surface 102 can be made black, and the black color of the recording surface 102 can be erased by the multi-pole magnetized rubber magnet 2 having control means. Activation of the magnetic particles 104 and erasure of the black color of the recording surface 102 can be performed in a series of operations.

[0114] Figure 10(A) shows an example of the 15th example, and Figure 10(B) shows another example of the 15th example. In the magnetic eraser 1 of the 15th example shown in Figure 10(A), the erasure non-functional multi-pole magnetized rubber magnet 8 is arranged on the tip side in the scanning direction (arrow direction) of the multi-pole magnetized rubber magnet 2. In the magnetic eraser 1 of the 15th example shown in Figure 10(B), the erasure non-functional multi-pole magnetized rubber magnet 8 is arranged at the center in the scanning direction of the multi-pole magnetized rubber magnet 2. The arrangement position of the erasure non-functional multi-pole magnetized rubber magnet 8 in the multi-pole magnetized rubber magnet 2 is not particularly limited as long as it is not on the rear end side in the scanning direction of the multi-pole magnetized rubber magnet 2.

[0115] The magnetic eraser 1 of the 1st to 15th examples configured as described above has a multi-pole magnetized rubber magnet 2 that can be easily cut and punched and is flexible. Therefore, the magnetic eraser 1 has an expanded degree of freedom in size and shape, and can also be made lighter in weight. For example, it can easily cope with a large microcapsule electrophoresis display 101 of whiteboard size.

Example

[0116] Hereinafter, the present invention will be specifically described with reference to the examples and comparative examples shown in Table 1, but the present invention is not limited thereto.

[0117] The surface of the recording surface of the microcapsule electrophoresis display that can be erased from the surface side of the recording surface was scanned with an erasure non-functional multi-pole magnetized rubber magnet with a 2.0 mm pitch and 250 gauss, and the surface was made black. The whiteness of the erased surface was measured using a spectrocolorimeter X-Rite 504 when the recording surface was scanned back and forth twice with various combinations of multi-pole magnetized rubber magnets and spacers.

[0118] The multi-pole magnetized rubber magnets A to F used are shown below. A: 0.45 mm thick, 2.0 mm pitch, 200 gauss B: 2.0 mm thick, 2.0 mm pitch, 250 gauss C: 1.0 mm thick, 2.5 mm pitch, 450 gauss D: 1.0 mm thick, 3.0 mm pitch, 500 gauss E: 2.0 mm thick, 4.0 mm pitch, 700 gauss F: 3.0 mm thick, 5.0 mm pitch, 800 Gauss

[0119] The results are shown in Table 1.

[0120]

Table 1

[0121] Judgment (Evaluation) ◎ indicates an erasure surface with particularly excellent whiteness ○ indicates a good erasure surface with whiteness △ indicates an erasure surface with low whiteness but can be used × indicates an erasure surface with inferior whiteness and cannot be used, or cannot be erased

[0122] The measurement value by the spectrocolorimeter X-Rite 504 indicates that the smaller the numerical value, the whiter, and the larger the numerical value, the blacker. When scanning the erasable inorganic multi-pole magnetized rubber magnet and using it as a black surface, the measurement value is 0.55. In many of the examples, good erasability was obtained. When the thickness of the spacer used in the comparison is insufficient or excessive, a good white surface cannot be obtained.

[0123] [Microcapsule Magnetophoresis Display System] Next, the microcapsule magnetophoresis display system according to the present invention will be described.

[0124] The microcapsule magnetophoresis display system 11 according to the present invention includes a microcapsule magnetophoresis display 101, a magnetic writing tool 12 for applying a magnetic field to the microcapsule magnetophoresis display 101 and writing and displaying a magnetic recording display body of black characters or images on the surface 102 of the recording surface, and a magnetic eraser 1 of any one of Examples 1 to 15. The magnetic writing tool 12 is not particularly limited, and a known magnetic writing tool can be used.

[0125] In the microcapsule electrophoresis display system 11 configured as described above, the magnetic writing instrument 12 and the magnetic eraser 1 may be configured separately or integrally. When the magnetic writing instrument 12 and the magnetic eraser 1 are separate bodies, magnetic erasers 1 of different sizes can be easily obtained, so it is suitable for making the size of the magnetic eraser 1 correspond to any size of the screen on the recording surface 102 of the microcapsule electrophoresis display 101. Also, when the magnetic writing instrument 12 and the magnetic eraser 1 are integrated, the magnetic eraser 1 will inevitably be small, The magnetic eraser 1 of the present invention can easily handle this situation, and is particularly suitable when the recording surface 102 of the microcapsule electrophoresis display 101 has a small screen, and is also suitable for cases where the screen is large and partial correction is made during writing.

[0126] FIG. 11 shows an example of the microcapsule electrophoresis display system 11 when the magnetic writing instrument 12 and the magnetic eraser 1 are integrated. The magnetic eraser 1 is provided at one axial end (the end opposite to the pen tip) of the body 13 of the magnetic writing instrument 12 and at two locations on the side surface of the body 13.

[0127] According to the microcapsule electrophoresis display system 11 configured as described above, it includes the microcapsule electrophoresis display 101, the magnetic writing instrument 12 for applying a magnetic field to the microcapsule electrophoresis display 101 to write and display a magnetic recording display body of black characters or images on the recording surface 102, and any one of the magnetic erasers 1 in the first to fifteenth examples. Therefore, the magnetic writing instrument 12 can write and display a magnetic recording display body of black characters or images on the recording surface 102 of the microcapsule electrophoresis display 101, and the magnetic eraser 1 can efficiently and stress - free erase the magnetic recording display body displayed on the recording surface 102.

[0128] In addition, by making the magnetic writing instrument 12 and the magnetic eraser 1 separate bodies, the size of the magnetic eraser 1 can be easily made to correspond to the size of the screen on the recording surface 102 of the microcapsule magnetic electrophoresis display 101, and writing and erasing can be easily performed regardless of the size of the screen on the recording surface 102 of the microcapsule magnetic electrophoresis display 101.

[0129] In addition, since the magnetic eraser 1 in which the magnetic writing instrument 12 and the magnetic eraser 1 are integrated controls the magnetic force to be appropriate, the magnetic influence on the peripheral part is small, and the erasing target can be erased within an accurate range.

Industrial Applicability

[0130] The present invention is widely used as stationery, toys, etc. as a magnetic eraser for a microcapsule magnetic electrophoresis display that can be erased from the recording surface side and a microcapsule magnetic electrophoresis display system.

Explanation of Symbols

[0131] 1 Magnetic eraser 2 Multi-pole magnetized rubber magnet 2a One-sided multi-pole magnetized rubber magnet 3 Erasing surface side 4 Magnetized surface 5a Spacer layer made of non-magnetic material 5b Spacer layer made of magnetic material 6 Non-magnetized surface 7 Magnetic material 8 Erasing non-functional multi-pole magnetized rubber magnet 11 Microcapsule magnetic electrophoresis display system 12 Magnetic writing instrument 13 Barrel part 101 Microcapsule magnetic electrophoresis display 102 Recording surface 103 Microcapsule 104 Magnetic particles 105 Surface substrate

Claims

1. A magnetic eraser for erasing a magnetic recording display body of black characters or images displayed by applying a magnetic field by scanning the surface of the recording surface of a microcapsule electrophoresis display, comprising: As an erasing means, a multi-pole magnetized rubber magnet is used, and one surface of the multi-pole magnetized rubber magnet is set as an erasing surface side for scanning the surface of the recording surface of the microcapsule electrophoresis display to erase the magnetic recording display body displayed on the surface of the recording surface, and the density of magnetic force lines emerging from the erasing surface side is controlled to a magnetic force suitable for aggregating magnetic particles in the microcapsules near the center of the microcapsules. A magnetic eraser characterized by this.

2. Using the magnetized surface of the multi-pole magnetized rubber magnet as the erasing surface side, and as a control means for controlling the density of magnetic force lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsules near the center of the microcapsules, a spacer layer made of a non-magnetic material is provided on the erasing surface side. The magnetic eraser according to claim 1, characterized by this.

3. Using the magnetized surface of the multi-pole magnetized rubber magnet as the erasing surface side, and as a control means for controlling the density of magnetic force lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsules near the center of the microcapsules, a spacer layer made of a magnetic material is provided on the erasing surface side. The magnetic eraser according to claim 1, characterized by this.

4. Using the magnetized surface of the multi-pole magnetized rubber magnet as the erasing surface side, and as a control means for controlling the density of magnetic force lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsules near the center of the microcapsules, a spacer layer made of a magnetic material and a non-magnetic material is provided on the erasing surface side. The magnetic eraser according to claim 1, characterized by this.

5. The multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, with the non-magnetized surface as the erasing surface side, and as a control means for controlling the density of magnetic force lines emerging from the erasing surface side to a magnetic force suitable for aggregating magnetic particles in the microcapsules near the center of the microcapsules, the thickness of the single-sided multi-pole magnetized rubber magnet is selected and set. The magnetic eraser according to claim 1, characterized by this.

6. The multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, with the non-magnetized surface on the erasing surface side, and the density of the magnetic field lines emerging from the erasing surface side is controlled to a magnetic force suitable for aggregating the magnetic particles in the microcapsules near the center of the microcapsules. As control means, the magnetization pitch of the single-sided multi-pole magnetized rubber magnet is selected and set. The magnetic eraser according to claim 1, characterized in that.

7. The multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, with the non-magnetized surface on the erasing surface side, and the density of the magnetic field lines emerging from the erasing surface side is controlled to a magnetic force suitable for aggregating the magnetic particles in the microcapsules near the center of the microcapsules. As control means, a spacer layer made of a non-magnetic material is provided on the erasing surface side. The magnetic eraser according to claim 1, characterized in that.

8. The multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, with the non-magnetized surface on the erasing surface side, and the density of the magnetic field lines emerging from the erasing surface side is controlled to a magnetic force suitable for aggregating the magnetic particles in the microcapsules near the center of the microcapsules. As control means, a spacer layer made of a magnetic material is provided on the erasing surface side. The magnetic eraser according to claim 1, characterized in that.

9. The multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, with the non-magnetized surface on the erasing surface side, and the density of the magnetic field lines emerging from the erasing surface side is controlled to a magnetic force suitable for aggregating the magnetic particles in the microcapsules near the center of the microcapsules. As control means, a spacer layer made of a magnetic material and a non-magnetic material is provided on the erasing surface side. The magnetic eraser according to claim 1, characterized in that.

10. The multi-pole magnetized rubber magnet is a single-sided multi-pole magnetized rubber magnet, and a magnetic material is installed on the magnetized surface. The magnetic eraser according to any one of claims 5 to 9, characterized in that.

11. The multi-pole magnetized rubber magnet is characterized in that both ends on both sides in the scanning direction are curved in a direction away from the surface of the recording surface of the microcapsule electrophoresis display. The magnetic eraser according to any one of claims 1 to 10.

12. The multi-pole magnetized rubber magnet provided with control means for controlling the density of the magnetic field lines emerging from the erasing surface side according to any one of claims 1 to 11, and an erasing non-functional multi-pole magnetized rubber magnet that does not have control means and scans the surface of the recording surface to make the surface of the recording surface black. The magnetic eraser is characterized in that one or more of each are arranged in parallel in the magnetization direction.

13. A microcapsule magnetophoresis display system, comprising a microcapsule magnetophoresis display, a magnetic pen for applying a magnetic field to the microcapsule magnetophoresis display to display a magnetic recording display body of black characters or images on the surface of the recording surface, and a magnetic eraser according to any one of claims 1 to 12, wherein the microcapsule magnetophoresis display system is characterized by including the above components.

Images