JP2019072908A - Magnetic eraser - Google Patents

Abstract

To provide a magnetic eraser capable of easily erasing characters and the like written on a magnetic sheet.SOLUTION: A magnetic eraser 100 of the present invention comprises a housing 110 including a sliding surface (112, 114) for a magnetic sheet 180 and having an inner space formed therein, a magnet 120 housed in the housing 110, a motor 140 housed in the housing 110 and rotating the magnet 120 via a rotation mechanism 130, and a battery 160 housed in the housing 110 and supplying the motor 140 power. The distance from the magnet 120 to the sliding surface (112, 114) is variable.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a magnetic eraser for erasing characters, figures, symbols, etc. drawn on a magnetic sheet or panel including a magnetic display, and in particular, changing the direction of a magnetic field applied to the magnetic sheet or panel. The present invention relates to a magnetic eraser having improved erase efficiency by causing

  In a magnetic panel containing magnetic particles and a dispersion in a microcapsule, the magnetic particles in the microcapsule are migrated by applying a magnetic field from a magnetic pen provided with a magnet at the tip, and desired characters, symbols, pictures, etc. A magnetic migration type magnetic panel for drawing is put to practical use. In addition, there is also put into practical use a magnetic inversion type magnetic panel which is a magnetic body whose front and back are N pole and S pole and which displays a desired character or the like by using a display pair in which each magnetic pole is colored in different colors. .

  The characters, symbols, etc. drawn on the magnetic panel can be erased by causing a magnetic eraser (hereinafter sometimes referred to as a magnetic eraser) to act on the front or back of the magnetic panel. For example, the recording apparatus of Patent Document 1 includes a magnetic sheet for recording having microcapsules and an erasing sheet provided on the back side of the magnetic sheet, and the erasing sheet is magnetically recorded using the power of a motor. The characters and figures on the magnetic sheet are erased by reciprocating the sheet while maintaining a posture substantially parallel to the sheet. Patent Document 2 discloses a magnetic orientation tool for a magnetic reversal display panel that enables erasing of characters, figures, and the like by causing a magnetic force in the direction opposite to the magnetic force exerted during recording to act from the writing surface. . Patent Document 3 discloses a magnetophoretic display sheet including two or more types of magnetic particles in the microcapsule, which is an erasable microcapsule magnetophoretic display sheet.

Unexamined-Japanese-Patent No. 2000-276082 International Publication WO 01/048548 Patent No. 4089808

The present invention is to solve such conventional problems, and it is an object of the present invention to provide a magnetic eraser capable of erasing characters and the like described on a magnetic sheet cleanly.
Another object of the present invention is to provide a magnetic eraser capable of erasing characters and the like described on a magnetic sheet in a wide range or a small range with good operability.
Furthermore, it is an object of the present invention to provide a magnetic eraser which can erase data from the front side or the back side of a magnetic sheet drawn with a magnetic pen.

  A magnetic eraser according to the present invention erases characters, figures, symbols, etc. drawn on a magnetic sheet or a magnetic panel, and includes a sliding surface for the magnetic sheet and a housing having an inner space formed therein. And at least one first magnet housed in the housing, a rotation means housed in the housing, rotating means for rotating the first magnet, and housed in the housing, the electric power is supplied to the rotation means And a battery to be supplied, wherein the distance from the first magnet to the sliding surface is variable.

  In one embodiment, the first magnet includes a plurality of cylindrical magnets or prismatic magnets, and a plurality of cylindrical magnets or prismatic magnets are connected in series by an axis. In one embodiment, the housing further has a protrusion for erasing characters and the like drawn on the magnetic sheet on a surface different from the sliding surface, and the second space is provided in the inner space of the protrusion. Magnets are arranged. In one embodiment, the second magnet is coaxial with the first magnet, and the second magnet also rotates as the first magnet rotates. In one embodiment, the rotation axis of the second magnet is connected to the rotation axis of the first magnet via a gear, and the second magnet also rotates when the first magnet rotates. In one embodiment, the second magnet is held stationary in the protrusion. In one embodiment, the magnetic eraser further includes a magnetic shield ring which is movable along the axial direction of the protrusion in the outer periphery of the protrusion. In one embodiment, by varying the distance from the tip of the protrusion to the magnetic shield ring, the erasing range by the protrusion is adjusted. In one embodiment, the rotating means and the battery are not disposed between the first magnet and the sliding surface. In one embodiment, the rotating means and the battery are disposed in a space separated from the space in which the first magnet is disposed. In one embodiment, the rotating means and the battery are disposed at a position where the distance from the first magnet is largest in the space where the first magnet is disposed.

  Furthermore, the magnetic eraser according to the present invention is for erasing characters, figures, symbols, etc. drawn on a magnetic sheet or a magnetic panel, and it comprises a housing in which an internal space is formed, and at least the housing housed in the housing. The housing includes: one first magnet; rotation means housed in the housing and rotating the first magnet; and a battery housed in the housing for supplying power to the rotation means, the housing A bottom surface, a top surface opposite to the bottom surface, two opposite side surfaces between the bottom surface and the top surface, and a second bottom portion formed on the front bottom surface, the top surface, and the two side surfaces Magnets are placed.

  Furthermore, the magnetic eraser according to the present invention is for erasing characters, figures, symbols, etc. drawn on a magnetic sheet or a magnetic panel, and it comprises a housing in which an internal space is formed, and at least the housing housed in the housing. It has one magnet, a rotating means housed in the housing and rotating the magnet, and a battery housed in the housing and supplying power to the rotating means, the housing comprising a bottom surface, the bottom surface And two opposite side surfaces between the bottom surface and the top surface, and the distances from the central axis of the magnet to the bottom surface, the top surface, and the two side surfaces are different, respectively; The two side surfaces function as an erasing surface.

  Furthermore, the magnetic eraser according to the present invention is for erasing characters, figures, symbols, etc. drawn on a magnetic sheet or a magnetic panel, and it comprises a housing in which an internal space is formed, and at least the housing housed in the housing. The apparatus comprises: one magnet, a rotating means housed in the housing and rotating the magnet, and a battery housed in the housing for supplying power to the rotating means, the housing comprising a housing body And a housing tip which can be moved axially with respect to the housing body, wherein the distance from the surface of the magnet to the surface of the housing tip is variable. In one embodiment, the magnetic eraser further includes a spring member that biases the housing tip away from the housing body.

  Furthermore, the magnetic eraser according to the present invention is for erasing characters, figures, symbols, etc. drawn on a magnetic sheet or a magnetic panel, and it comprises a housing in which an internal space is formed, and at least the housing housed in the housing. One magnet, a rotating means housed in the housing and rotating the magnet, a battery housed in the housing and supplying power to the rotating means, and the first magnet not driven by the battery And a user operation unit for adjusting the stationary position of the magnet. In one embodiment, the user operation unit is a rotary knob coaxial with the first magnet, and a part of the rotary knob is exposed to the outside from the groove of the housing. In one embodiment, the magnet includes a plurality of magnets, each of which is rotatably mounted within the housing, and one of the plurality of magnets selected is rotated by the rotating means. When the selected one magnet is rotated in a first direction, the other adjacent magnets are rotated in a second direction opposite to the first direction. In one embodiment, at least two magnets of the plurality of magnets are disposed at different distances from the magnetic sheet. In one embodiment, the sliding surface can move so as to change the distance from the rotation axis of the first magnet. In one embodiment, the sliding surface is tiltable with respect to the rotation axis of the first magnet.

  Furthermore, the magnetic eraser according to the present invention is for erasing characters, figures, symbols, etc. drawn on a magnetic sheet or a magnetic panel, and it comprises a housing in which an internal space is formed, and at least the housing housed in the housing. The housing includes: one first magnet; rotation means housed in the housing and rotating the first magnet; and a battery housed in the housing for supplying power to the rotation means, the housing Includes a housing body and a housing tip which can move axially relative to the housing body, and a second magnet is disposed within the housing tip. In one embodiment, the second magnet is simultaneously rotated when the first magnet is rotated. In one embodiment, the distance from the surface of the second magnet to the surface of the housing tip is variable.

  According to the present invention, it is possible to cleanly erase characters and the like drawn on a magnetic sheet. Furthermore, according to the present invention, it is possible to erase characters and the like from the front side and the rear side drawn on the magnetic sheet. Furthermore, according to the present invention, it is possible to freely change the erasing range of characters and the like drawn on the magnetic sheet.

It is a figure showing the magnetic eraser concerning the 1st example of the present invention. It is a figure showing the magnetic eraser concerning the 2nd example of the present invention. It is a figure explaining the detail of the magnetic shield ring concerning the 2nd Example of this invention. It is a figure which shows the magnetic eraser which concerns on the 3rd Example and 4th Example of this invention. It is a figure showing the magnetic eraser concerning the 5th example of the present invention. It is a figure which shows the magnetic eraser which concerns on the 6th Example of this invention. It is a figure showing the magnetic eraser concerning the 7th example of the present invention. It is a figure showing the magnetic eraser concerning the 8th example of the present invention. It is a figure showing the magnetic eraser concerning the 9th example of the present invention. It is a figure showing the magnetic eraser concerning the 10th example of the present invention. It is a figure showing the magnetic eraser concerning the 11th example of the present invention. It is a figure which shows the magnetic eraser which concerns on the 12th Example of this invention. FIG. 13A is a cross-sectional view showing a configuration example of a magnetic panel, and FIG. 13B is a view showing an example of erasing by a magnetic eraser.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. In a preferred embodiment of the present invention, the magnetic eraser has a mechanism for dynamically changing the magnetic field, and a character, a graphic, or the like drawn on the magnetic sheet by the magnetic pen by causing the changing magnetic field to act on the magnetic panel. Delete the symbol etc. In a further preferred embodiment, the magnetic eraser can erase characters and the like by applying a magnetic field from the writing surface of the magnetic panel, and can erase the magnetic field even from the back side opposite to the writing surface. . It should be noted that the size of each part shown in the drawings does not necessarily coincide with the size of the actual product.

  Next, a first embodiment of the present invention will be described with reference to FIG. FIG. 1A is a schematic cross-sectional view of the magnetic eraser according to the first embodiment. The magnetic eraser 100 controls the operation of a housing 110, a magnet 120 housed in the housing 110, a rotation mechanism 130 for rotating the magnet 120, a motor 140 for driving the rotation mechanism 130, and a motor 140. And a control base 150 on which electronic circuits and the like are mounted, and a battery 160 for supplying power to the motor 140 and the electronic circuits.

  The housing 110 can be made of any material, but at least the erasing surface for erasing characters and the like drawn on the magnetic sheet is made of a material capable of transmitting magnetic field lines, such as plastic. The shape of the housing 110 is arbitrary, but here, the shape is a cube having a hexahedron. The housing 110 forms a cubic space inside, and accommodates the magnet 120, the rotation mechanism 130, the motor 140, the control base 150, and the battery 160 in the inner space.

  The bottom surface 112 of the housing 110 can function as a sliding surface sliding on the magnetic sheet 180 for drawing characters and the like. In one embodiment, the bottom surface 112 is attached with a slide promoting member 114 for reducing the frictional resistance with the magnetic sheet 180 or facilitating the sliding. The sliding facilitating member 114 is preferably a felt material, and the felt material simultaneously erases the characters and the like of the marker when, for example, the characters and the like are drawn with the marker for the white board on the magnetic sheet 180. It is also possible.

  Although the magnet 120 is not particularly limited in its shape, it has, for example, a cylindrical shape and has a length L1 in the axial direction. When the magnet 120 is cylindrical, as shown in FIG. 1B, the N pole and the S pole are magnetized in the radial direction of the rotation axis P. Alternatively, when the magnet 120A has a prismatic shape, the N pole and the S pole are magnetized in the height direction with respect to the rotation axis P thereof. A rotating shaft 122 is attached to the center of the magnet 120, and the rotating shaft 122 is coupled to the rotating mechanism 130. The rotation axis 122 of the magnet 120 is substantially parallel to the bottom surface 112 of the housing 110. The magnet 120 can select the position of height h1 or height h2 (h1> h2) from the surface of the magnetic sheet 180 when the housing 110 slides on the magnetic sheet 180. A magnetic field or magnetic field line from the north pole to the south pole acts on the magnetic sheet 180 beyond the bottom surface 112 of the housing 110. When the magnet 120 is rotated, the lines of magnetic force of the magnet 120 change, the changed lines of magnetic force act on the magnetic sheet 180, and the characters and the like drawn on the magnetic sheet 180 are drawn on the surface side of the magnetic sheet 180 It is possible to erase from the writing side) or from the back side.

  In the present embodiment, the height of the magnet 120 can be changed to h1 or h2. The parameters that affect the erasing of the magnetic sheet 180 are (1) Gauss (strength) of the magnet 120, (2) the distance from the magnet 120 to the surface of the magnetic sheet 180, and (3) the number of rotations of the magnet. When erasing, it is desirable to adjust these parameters so that magnetic lines of force act on the magnetic sheet 180 in the optimum range and direction. Moreover, the character etc. drawn on the magnetic sheet 180 may differ in the direction of the optimal magnetic force line, when time passes. In such a case, by changing the height of the magnet 120 to h1 or h2 or changing the number of rotations of the magnet 120, it is possible to select the direction of the magnetic force or the strength of the magnetic force that makes it easy to erase characters and the like. Make it The method of adjusting the height of the magnet 120 will be described later.

  The rotation mechanism 130 includes a gear 132 connected to the rotation shaft 122 and a gear 134 meshing with the gear 132. The height of the magnet 120 can be adjusted to h 1 by the diameter of the gear 132, 134. Further, by making the magnet 120 and the gear 132 movable between two positions centered on the rotation axis of the gear 134, the height of the magnet 120 can be changed from h1 to h2. Furthermore, the heights h1 and h2 of the magnet 120 can be changed using known techniques such as a link mechanism.

  The motor 140 is coupled to the gear 134 to rotate the gear 134. The rotation of the gear 134 rotates the magnet 120 via the gear 132 and the rotation shaft 122. Although two gears 132 and 134 are used here, the number of gears is arbitrary. The gears may be of any type such as spur gears, worm gears, bevel gears and the like. Alternatively, the power transmission mechanism may use a belt instead of the gear. Further, the rotation mechanism 130 may have a function of converting the rotation direction of the motor 140 into different directions, for example, orthogonal directions.

  The control base 150 mounts an electronic circuit for controlling the drive of the motor 140. The electronic circuit can include, for example, a microcomputer, a circuit for driving the motor 140, and the like. The microcomputer can perform control to rotate the motor 140 at a preset rotation number or to change the rotation number of the motor 140 by user input. In this case, the user operation unit 154 is mounted on the housing 110, and a signal input from the user input operation unit 154 is provided to the microcomputer.

  The control base 150 is connected to the battery 160 via the switch 152, and when the switch 152 is turned on, the power from the battery 160 is supplied to the control base 150. The control base 150 becomes operable when power is supplied, and the motor 140 can be driven. The switch 152 is turned on / off by the user, for example. In this case, a user operation unit 154 is provided on the surface of the housing. Alternatively, the switch 152 may be turned on / off in response to a detection sensor that detects contact or approach of an object such as a user. In this case, the detection sensor is attached to any surface of the housing 110, the detection result of the detection sensor is provided to the microcomputer, and the microcomputer controls the turning on or off of the switch 152.

  The battery 160 can be of any shape, size. Also, the battery 160 may be a rechargeable secondary battery.

  As described above, when the magnetic eraser 100 is moved on the magnetic sheet 180, magnetic lines of force from the magnet 120 act on the magnetic sheet 180, and characters and the like drawn thereon can be erased. At this time, the range to be eliminated is defined by the axial length L1 of the magnet 120. In the case of erasing characters and the like, it is preferable to rotate the magnet 120, but it is also possible to perform the erasing while the rotation of the magnet 120 is stopped. When the magnet 120 is rotated, the erasing ability is higher than that when the magnet 120 is at rest, that is, when the magnet 120 is rotated, the erasing time is short and the erasing can be performed cleanly. When the magnet 120 is stopped and erased, the magnet 120 needs to be stopped at the erasable position with respect to the magnetic sheet 180.

  FIG. 1B shows a modification of the first embodiment. When it is desired to collectively erase a relatively large area on the magnetic sheet 180 by the magnetic eraser 100, the range of magnetic lines of force generated by the magnet 120 may be enlarged. For example, as shown in FIG. 1C, the centers of the plurality of cylindrical magnets 120-1, 120-2, 120-3 are connected by the shaft 122, and the three magnets 120-1, 120-2, 120 are connected. Let -3 rotate at the same time. At this time, the poles of the three magnets 120-1, 120-2, and 120-3 are directed in the same direction, and when the three magnets are rotated, the change in magnetic lines of force generated therefrom is equalized. Moreover, each magnet 120-1, 120-2, and 120-3 may be made to be connected by fixed spacing Ln in the direction of an axis.

  Next, a second embodiment of the present invention will be described with reference to FIG. The magnetic eraser 200 according to the second embodiment has a function capable of erasing characters and the like in a wide range and a small range. The magnetic eraser 200 of the second embodiment has the same reference numerals as those of the first embodiment.

  In addition to the configuration of the first embodiment, the magnetic eraser 200 includes a small-range eraser 210 that enables small-range erasure. The small range eraser 210 is provided on one side of the housing 110. For example, when the housing 110 has a width W, a height H, and a depth D, the small range elimination unit 210 is attached to, for example, an axial side surface 114 on which the magnet 120 rotates.

  The small-range eraser 210 includes a generally cylindrical housing 220, a small magnet 230 housed in the housing 220, a magnetic shield ring 240 axially movable on the outer periphery of the housing 220, and a housing 110. And a magnetic shield plate 250 for shielding the magnetic lines of force from the inner magnets 120.

  The housing 220 is made of a material capable of transmitting magnetic field lines, such as plastic. The housing 220 is hemispherically closed at one end 222 and is open at the other end 224, and the other end 224 is coupled to substantially the center of the side surface 116 of the housing 110. The circular opening of the other end portion 224 is smaller than the height H and the depth D of the side surface 116.

  A magnet 230 rotatable coaxially with the magnet 120 is disposed in an inner space of the housing 220. In one aspect, the rotational axis 122A of the magnet 120 passes through the side surface 114 of the housing 110 and extends into the housing 210, and the magnet 230 is attached to the rotational axis 122A. The magnet 230 has, for example, a disk shape in which an N pole and an S pole are magnetized in the direction of the rotation shaft 122A. The magnet 230 is positioned at a fixed distance relative to the hemispherical end 222 of the housing 220.

  The magnetic shield ring 240 can move in the axial direction of the housing 220 arbitrarily. Although the method of movement is not particularly limited, for example, the magnetic shield ring 240 is freely moved so as to generate a constant frictional force with the housing 220, and is stopped at a desired position. Alternatively, the inner surface of the magnetic shield ring 240 may be concave or convex, the outer surface of the housing 220 may be convex or concave, and the movement of the magnetic shield ring 240 may be stopped at a position where the two concave and convex portions are engaged. Good. Alternatively, the magnetic shield ring may be axially moved by rotation using a screw groove formed on the outer periphery of the housing 220. The magnetic shield ring 240 adjusts the range of magnetic lines of force exerted by the magnet 230 on the magnetic sheet 180, and when the magnetic shield ring 240 approaches the hemispherical end 222 of the housing 220, the magnetic lines of force of the magnet 230 Limited to the direction perpendicular to the axial direction of the housing), and the erasing range is narrowed, and when the magnetic shield ring 240 is moved to the other end 224 side, the lateral range of the magnetic force lines of the magnet The erasure range is expanded.

  Magnetic shield plate 250 provides magnetic isolation between housing 110 and housing 220. In the example shown in the figure, the magnetic shield 250 is provided on the entire side surface 114 of the housing 110, but the magnetic shield plate 250 may be provided on the other end 224 side of the housing 220.

  As shown in FIG. 2A, the hemispherical end 222 of the housing 220 is moved on the magnetic sheet 180, and the magnetic lines of force from the magnet 230 are applied to the magnetic sheet 180 to make small on the magnetic sheet 180. The characters in the range can be deleted. In this example, by making one end of the housing 220 hemispherical, the angle θ between the rotation axis of the housing 220 and the magnetic sheet 180 can be arbitrarily selected. By varying the angle θ, the distance between the magnet 230 and the magnetic sheet 180 can be adjusted to obtain the angle θ that is the easiest to erase. In this example, one end of the housing 220 is hemispherical, but this is an example, and the distances L1, L2,... The shape of may be determined. It is desirable that the shape of the tip portion can be erased in the range of θ = 90 ° to 30 °. When erasing is performed by the small range erasing unit 210, the magnet 230 may be stationary or may be rotated.

  In the above embodiment, an example in which the magnet 230 is coaxial with the magnet 120 is shown, but both magnets do not necessarily have to be coaxial. For example, as shown in FIG. 2C, by interposing a plurality of gears 260, 262, 264 between the magnet 120 and the magnet 230, the rotation shaft 122 of the magnet 120 and the rotation shaft 122A of the magnet 230 Can be separated. With such a configuration, the degree of freedom in layout is expanded, and for example, as shown in FIG. 2 (D), the small range eraser 210 can be offset upward from the central position of the housing 110. Furthermore, an optimum erase rotation may be set for the magnet 230 by appropriately selecting the gear ratios of the plurality of gears. In this case, the number of rotations of the magnet 230 does not necessarily match the number of rotations of the magnet 120.

  Next, the detailed operation of the magnetic shield ring will be described with reference to FIG. As described above, the magnetic shield ring 240 is made of, for example, a magnetic material such as iron, is axially movable on the housing 210, and adjusts the range of the lines of magnetic force of the magnet 230 by the movement. FIG. 3 is a diagram illustrating the relationship between the position of the magnetic shield ring 240 and the erasure range at that time. The distance h from the surface of the magnet 230 to the magnetic sheet 180 is set optimally. The rotation of the magnet 230 changes the lines of magnetic force from the N pole to the S pole, and the changed lines of magnetic force act on the magnetic sheet 180.

  As shown in FIG. 3A, when the magnetic ring sheet 240 is on the front side of the magnet 230, that is, when the distance P1 between the magnetic ring sheet 240 and the magnetic sheet 180 is larger than the optimum distance h ( P1> h), magnetic lines of force of the magnet 230 do not cause interference by the magnetic ring sheet 240. Therefore, characters and the like on the magnetic sheet 180 can be beautifully erased in the erasing range (2 × r1) corresponding to the optimum distance h.

  The magnetic ring sheet 240 is moved in the direction of the magnetic sheet 180 as shown in FIG. 3B, and the tip portion of the magnetic ring sheet 240 overlaps the magnet 230. That is, when the distance P2 between the magnetic ring sheet 240 and the magnetic sheet 180 becomes smaller than the optimum distance h (P2 <h), the lateral direction of the magnetic lines of force coming out of the N pole of the magnet 230 and returning to the S pole The size of the direction orthogonal to the axis of rotation is somewhat limited. Therefore, the erasing range (2 × r2, r2 <r1) is narrowed.

  As shown in FIG. 3C, the magnetic ring sheet 240 is further moved toward the magnetic sheet 180 to reduce the distance P3 between the magnetic ring sheet 240 and the magnetic sheet 180 (P3 <h, P3 <P2 ). Then, the lateral size of the magnetic lines of force acting on the magnetic sheet 180 by the magnet 230 is further limited, and as a result, a very small erase range (2 × r3, r3 <r2) can be obtained. It is effective in erasing the very small area drawn on the magnetic sheet 180.

  Next, a third embodiment of the present invention will be described with reference to FIG. In the figure, the same reference numerals as in the first and second embodiments denote the same parts. The third embodiment relates to a method of reducing the power consumption of the magnetic eraser motor.

  As shown in the figure, the magnetic eraser 300 according to the third embodiment includes a magnet 120, a rotation mechanism 130, a motor 140, a control base 150 and a battery 160 in a housing 110. If a metal member such as iron is present between the magnet 120 and the magnetic sheet 180, the magnet 120 attracts the metal member, making it difficult for the magnet 120 to rotate, and the current consumption of the motor 140 increases. That is, as shown in the magnet 120 or the magnet 310 of the N pole and the S pole as shown in FIG. 4B, a metal such as iron in the directions Sa and Sb in which the magnetic action of the magnetic lines of force from the N pole to the S pole The presence of the member 320 attracts the magnet and makes it difficult to rotate the magnet. Thus, in the third embodiment, the motor 140, the control base 150 and the battery 160 are not installed in the circumferential direction of the magnet 120 between the magnet 120 and the bottom surface 112 of the housing 110. Also, in one embodiment, the internal space of the housing 110 is divided into two by the partition 330 in the direction perpendicular to the rotation axis, the magnet 120 is disposed in one internal space, and the other internal located horizontally with this The rotation mechanism 130, the motor 140, the control base 150 and the battery 160 are disposed in the space. Although the material of the partition 130 is not particularly limited, for example, it is desirable to be made of a nonmagnetic material in order to prevent the magnetic force of the magnet 120 from being attracted. When the magnet 120 is attracted to the partition 130 made of a magnetic material, the magnet 120 is difficult to rotate, and power consumption for driving the magnet 120 is increased.

  As described above, when the metal member is not installed in the circumferential direction of the magnet 120, the magnetic eraser extends in the horizontal direction (lateral direction), which makes downsizing difficult. In the modification of the third embodiment, by arranging the battery and the motor as far as possible from the magnet 120, both reduction in power consumption and downsizing can be achieved.

  FIG. 4C is a schematic front view schematically showing the internal structure of the magnetic eraser according to the fourth embodiment, and FIG. 4D is a schematic side view schematically showing the internal structure. . The magnetic eraser 400 includes a magnet 120, a motor 140, a control base 150, a battery 160 and the like in a housing 110. The magnet 120 is coupled to the drive shaft of the motor 140 via gears 350, 352, 354. The magnet 120 is disposed slightly above the center of the housing 110, and the battery 160 and the motor 140 are disposed in a corner portion of the bottom surface 112 of the housing 110 at a distance in the form of a “C”. By separating the motor 140 and the battery 160 from the magnet 120 as much as possible, the magnetic force attracting the magnet 120 to the motor 140 and the battery 160 cancels each other, and the load when rotating the magnet 120 can be reduced. As a result, power consumption by the motor 140 can be reduced, and the life of the battery 160 can be extended. Further, by disposing the magnet 120, the motor 140, the control base 150, the battery 160 and the like in one housing 110, the magnetic eraser can be miniaturized.

  Next, a fifth embodiment of the present invention will be described with reference to FIG. As shown in FIG. 5A, the magnetic eraser 500 according to the fifth embodiment includes a housing 510 whose corner portion is chamfered. That is, the housing 510 includes an upper surface 510-1, a left surface 510-2, a bottom surface 510-3, and a right surface 510-4, and inclined surfaces 510-A, 510-B, 510- between the respective surfaces. C, 510-D are formed. Similar to the embodiment described above, a cylindrical magnet 120 rotated by a motor 140 is mounted in the housing 510.

  In the fifth embodiment, the top surface 510-1, the left surface 510-2, the bottom surface 510-3, and the right surface 510-4 of the housing 510 are each slidable with respect to the magnetic sheet, and on the magnetic sheet When slid, characters and the like drawn on the magnetic sheet can be erased. It should be noted here that the distances from the rotation axis of the magnet 120 to the four planes are different, and magnetic lines of different size and / or direction can be applied to the magnetic sheet. Specifically, the distances orthogonal to the surfaces from the rotation axis of the magnet 120 to the top surface 510-1, the left surface 510-2, the bottom surface 510-3, and the right surface 510-4 are L1, L2, L3, and L4, respectively. There is a relationship of L1> L2> L3> L4. The user can select a surface from which characters and the like can be erased cleanly and slide the selected surface on the magnetic sheet.

  Furthermore, four magnets 520 are attached to the tip surface E of the four inclined surfaces 510-A, 510-B, 510-C, and 510-D of the housing 510, respectively. The distal end surface E may be a plane perpendicular to the rotation axis of the magnet 120 as shown in FIG. 5B, or may be a plane inclined to the rotation axis. A magnet 520 is attached to such a tip surface E. The magnet 520 is preferably covered by a protective member 522. In this case, the protective member 500 is made of a nonmagnetic material capable of transmitting magnetic lines of force, and the surface of the magnet 520 is set at an erasable distance from the tip of the protective member 522. The number and shape of the magnets 520 are arbitrary, and can be, for example, a single plate structure magnet, a plurality of magnets, and a ring-shaped magnet as shown in FIG. 5 (C). Furthermore, the magnets attached to the end faces E of the four faces 510-A, 510-B, 510-C, and 510-D do not have to be the same, and by appropriately selecting the size and orientation of the magnets, Magnetic field lines of different magnitudes or magnetic field lines of different directions may be generated.

  The magnet 520 attached to the front end surface E makes it possible to erase characters and the like in a small area on the magnetic sheet. In such a case, the user erases by sliding the tip surface E on the magnetic sheet. As a characteristic of the magnetic sheet, since it becomes difficult to erase as time passes after drawing, stronger magnetic force lines (magnetic field) may be required in general. However, although application of excessive magnetic lines of force can be eliminated, the white surface tends to be grayish. In the fifth embodiment, any one of the upper surface 510-1, left side 510-2, bottom surface 510-3, and right side 510-4 of the housing 510 is selected, and the selected surface is slid on the magnetic sheet. Then, magnetic force lines of different strengths can be applied to the magnetic sheet.

  FIG. 5D is a modification of the fifth embodiment. In the second embodiment shown in FIG. 2, the magnet 230 of the small range eraser 210 is rotatable by the magnet 120 and the motor 140. However, in the magnetic eraser shown in FIG. A small range eraser 550 is provided at a corner portion of the housing 110, and the magnet 560 disposed in the small range eraser 550 is stationary. Even with such a configuration, by sliding the small range eraser 550 on the magnetic sheet, it is possible to erase the small range by applying the magnetic lines of force from the magnet 560 of the small range eraser 550 to the magnetic sheet. It is.

  Next, a sixth embodiment of the present invention will be described with reference to FIG. The magnetic eraser 600 according to the sixth embodiment includes a magnet that can be erased at each corner. The magnetic eraser 600 includes a housing 610, a magnet 620, a motor 630, a battery 640, and a control base 650. A magnet 660 is installed at each of the four corner portions of the front end of the housing 610 that is chamfered. A space for housing the magnet 620 and a space for housing the magnet 660 are separated by, for example, a magnetic shield plate 670. By utilizing the corners of such a magnetic eraser 600, it is possible to erase a small area on the magnetic sheet.

  Next, a seventh embodiment of the present invention will be described with reference to FIG. The magnetic erasing unit 700 according to the seventh embodiment has a configuration in which the housing distal end portion 710 is movable in the axial direction with respect to the housing main body portion 720. The housing body portion 720 has an axially extending cylindrical portion 722, and in the cylindrical portion 722, an axially extending rotating shaft 732 and a magnet 730 connected to the rotating shaft 732 are disposed. . Further, a motor, a battery, and the like are incorporated in the housing main body portion 720 as in the above embodiment.

  The housing tip 710 is configured to be axially movable on the cylindrical portion 722, and the housing tip 710 is separated from the housing main body 720 by a coil spring 712 wound around the outer periphery of the cylindrical portion 722. It is biased in the direction. When pressing the magnetic eraser 700 against the magnetic sheet 180, the user can adjust the position of the housing tip 710 by adjusting the pressing force.

  For example, as shown in FIG. 7A, when the housing distal end 710 is largely separated from the housing main body 720, the distance from the magnet 730 to the magnetic sheet 180 is D1, and the small range of radius r1 is erased. It is possible. Also, as shown in FIG. 7B, when the user presses the magnetic eraser 700 against the magnetic sheet 180 with a somewhat strong force, the housing tip 710 against the coil spring 712 contacts the housing body 720. As they approach, the distance from the magnet 730 to the magnetic sheet 180 becomes D2 (D2 <D1). As a result, the lines of magnetic force acting from the magnet 730 to the magnetic sheet 180 become large, and erasing of a relatively large range of the radius r2 becomes possible (r2> r1).

  Furthermore, as in the second embodiment, a magnetic shield ring 740 movable in the axial direction on the outer periphery of the housing tip portion 710 is provided, and the magnetic shield ring 740 is moved to make fine lines of magnetic force of the magnet 730 Adjustment may be made to change the erasable range.

  Next, an eighth embodiment of the present invention will be described with reference to FIG. The eighth embodiment enables erasing while the magnet 120 is at rest. For example, when the remaining amount of the battery 160 runs out, the rotation by the motor 140 is stopped and the magnet 120 is stopped, but if the stationary position of the magnet 120 is at a predetermined position, the characters etc. on the magnetic sheet 180 are erased. It is possible. However, the erasing ability when rotating the magnet 120 (erasable in a short time and capable of clean erasing) is higher than the erasing ability when the magnet 120 is stopped. For example, as shown in FIG. 8B, when the magnet 120 is moved in a state of being inclined with respect to the magnetic sheet 180, magnetic lines of force from the magnet 120 act on the magnetic sheet 180 depending on the stationary position of the magnet 120. , Can be erased.

  The magnetic eraser 800 of the eighth embodiment includes a rotating screw 810 for adjusting the stationary position of the magnet 120. A groove for exposing the rotary knob 810 is formed on the surface of the housing 110, and the user rotates the rotary knob 810 to set the stationary position of the magnet 120. The rotating knob 810 is connected to, for example, a rotating shaft 820 coaxial with the rotating shaft 112 of the magnet 120. By operating the rotation knob 810, the stationary position of the magnet 120 is adjusted, and the inclination angle θ of the magnet 120 is determined as shown in FIG. 8 (B). In addition, preferably, the rotation knob 810 is provided with an identification mark 812 so that the user can easily set the stationary position of the magnet 120 which can be erased. The form of the identification mark 812 is arbitrary, and for example, the outer peripheral portion of the rotary knob 812 can be given a specific color or given a specific shape.

Next, the ninth embodiment of the present invention will be described with reference to FIG. In the ninth embodiment, one of the plurality of magnets is rotated by a motor, and the other magnets are interlocked with the rotation.
FIG. 9A is a perspective view of the three magnets 120-1, 120-2, and 120-3, and FIG. 9B is a front view of the three magnets. The magnets 120-1, 120-2, and 120-3 are arranged such that their axial directions are parallel to each other at appropriate intervals. Although which magnet is rotated by the motor is optional, in this example, the central magnet 120-2 is rotated by the motor. FIG. 9C shows a state in which the magnet 120-2 is rotated by the motor by an angle θ. Adjacent magnets 120-1 and 120-3 rotate in the opposite direction to magnet 120-2 due to the action of magnetic lines of force with magnet 120-2. By rotating a plurality of magnets in this manner, a wide range of erasing can be performed, and at the same time, only one magnet needs to be rotated, thereby increasing the power consumption as compared to the case of rotating a plurality of magnets. Can be suppressed.

  The eighth embodiment can also be applied to the ninth embodiment. When the magnet 120-2 is at an angle θ and the other magnet is at a stationary position associated therewith, the erasing force is increased. As in the eighth embodiment, the user can adjust the stationary position of the magnet 120-2 by operating the rotary knob.

  Next, a tenth embodiment of the present invention will be described with reference to FIG. In order to erase characters and the like drawn on the surface of the magnetic sheet, an optimum magnetic force is required. If the magnetic force is stronger than the optimum value, the erasing power is strong, but the magnetic sheet after erasing does not become optimum white, but looks grayish. Therefore, in the magnetic eraser of the tenth embodiment, as shown in the figure, the distance from the magnetic sheet 180 is h2 so that the magnetic force of the central magnet 120-2 becomes larger than the optimum value, and The distances h1 and h3 are set to h1 and h3 larger than the distance h2 so that the magnetic forces 120-1 and 120-3 have optimum values (h2 <h1 ≦ h3). Magnet 120-2 of distance h2 has strong erasing power because magnetic force B2 is strong, and it becomes gray after erasing, but gray is due to magnetic force B1, B3 of optimum value of magnets 120-1 and 120-3 of h1 and h3. It becomes white (B2> B1 ≧ B3). Thus, for example, characters and the like which are difficult to erase after a lapse of time can be erased cleanly.

  Also, in the above example, the strength of the magnetic lines of force is made different by changing the distance from the magnet to the magnetic sheet, but the invention is not limited thereto. The same effect can be obtained by changing the Gaussian).

  An eleventh embodiment of the present invention will now be described with reference to FIG. The magnetic eraser 1100 according to the eleventh embodiment has a substantially rectangular housing 800, and at one end 810, a magnet 230 is accommodated inside as in the case of the second embodiment. A range erasing unit 210 is provided. In the eleventh embodiment, the four surfaces 820, 822, 824, 826 of the housing 800 are the erasing surfaces. The center of rotation axis of the magnet 120 is positioned so that the linear distances L1, L2, L3, L4 from the four faces 820, 822, 824, 826 are different from each other, and acts on the magnetic sheet from each of the four erase faces The strength of the magnetic force is different.

  Also, in the present example, one surface, eg, bottom surface 826, is attached to housing 800 to provide an inclined surface. One end of the bottom surface 826 is rotatably supported by the shaft 830 in the housing 800, and a coil spring 840 is wound around the shaft 830 to bias the bottom surface 826 in a direction away from it. When the user presses the bottom surface 826 against the magnetic sheet against the coil spring 840, the bottom surface 826 rotates so as to reduce the inclination accordingly. By varying the inclination angle of the bottom surface 826 in this manner, the magnitude of the magnetic force acting from the magnet 120 to the magnetic sheet can be varied, and an optimum distance for erasing can be easily selected. In a preferred embodiment, the surface of the bottom surface 826 is provided with a felt material 827 capable of simultaneously erasing a whiteboard marker when drawn on the magnetic sheet.

  FIG. 11B shows a modification of the eleventh embodiment. In this example, the bottom surface 826 is not movable but fixed. A felt 827 is provided on each of the four faces 820, 822, 824, 826.

  The twelfth embodiment of the present invention will now be described. FIG. 12 is a schematic sectional view showing a detailed structure of the twelfth embodiment. In the figure, the magnetic eraser 1200 includes a cylindrical housing body 900 with an open tip, and a closed cylindrical housing tip 910 attached to the tip of the housing body 900. Housing tip 910 is biased away from housing body 900 by coil spring 920.

  A motor 930 and a cylindrical magnet holding member 940 connected to the rotational shaft of the motor 930 are disposed in the housing body 900. The magnet holding member 940 includes a ring-shaped magnet 950 attached to the open end, a circular spring support member 960 attached to the bottom of its inner space, and one of the shafts projecting from the spring support member 960. And a coil spring 980 fixed at one end to the connecting shaft 970 at the other end. The connecting shaft 980 extends axially through a central hole of the magnet 950, one end of which is supported by a coil spring 980, and the other end is attached with a magnet 990.

  As shown in FIG. 12A, when the housing distal end 910 is at the position farthest from the housing body 900, the magnet 990 is at a distance h1 from the magnetic sheet 180, and the magnet 950 is at a distance h2. . The distance h 2 is a position where the magnet 950 does not affect the magnetic sheet 180 by the magnetic force, and the distance h 1 is an optimal erasing position of the magnet 990. By driving the motor 930 to rotate the magnet 950 and the magnet 990 and moving the housing tip 910 over the magnetic sheet 180 in this state, a relatively small range of erasing can be performed by the magnet 990.

  As shown in FIG. 12B, when the housing body 900 is pressed against the magnetic sheet 180, the distance between the housing body 900 and the housing tip 910 is reduced against the spring force of the coil spring 920. The magnet holding portion 940 approaches the magnetic sheet 180. At this time, although the distance h2 of the magnet 990 does not change, the distance from the magnet 950 to the magnetic sheet 180 changes to h3. The distance h3 is the optimum erasing position of the magnet 950. When the magnet 950 and the magnet 990 are rotated by driving the motor 930, and the housing tip 910 is moved on the magnetic sheet 180 in this state, the combined magnetic force of the magnet 990 and the magnet 950 acts on the magnetic sheet to relatively A large range of erasures is possible.

  In the present invention, the above-described first to twelfth embodiments may be implemented alone, or a plurality of the first to twelfth embodiments may be appropriately combined and implemented.

  FIG. 13A shows an example of a preferred magnetic sheet which can utilize the magnetic eraser of this embodiment. The magnetic sheet 180 is a transparent sheet capable of transmitting a magnetic field, and is provided between the top sheet 182 constituting the display surface of the magnetic sheet, the back sheet 184 facing the top sheet 182, and the top sheet 182 and the back sheet 184. It comprises a plurality of microcapsules 186 arranged two-dimensionally in the space. The plurality of microcapsules 186 are accommodated in a case not shown.

In one embodiment, the microcapsules 186 may be, for example, one or more types of magnetic particles with a particle size of 0.1 μm to 1.0 μm and one or more types of magnetic particles with a particle size of 1 μm to 20 μm in a transparent spherical cell. , Non-magnetic particles such as white titanium oxide, dispersion liquid, and additives. The size of the microcapsules is, for example, 50 to 650 μm. Such a magnetic migration type magnetic panel is disclosed, for example, in Patent Document 3 and has the following features.
a. Small particles are likely to react in the direction of the magnetic field lines with horizontal magnetic field lines.
b. In a magnetic pen having perpendicular magnetic field lines, large and small magnetic particles react to darken the surface side, and characters can be drawn.
c. When erasing from the surface of the magnetic panel, if only horizontal lines of magnetic force are applied to small particles that easily react to horizontal magnetic lines of force, small particles migrate in the direction of magnetic line of force and become white. At this time, large particles are hardly reacted, so they remain "black", and since black is seen through from the surface, they are not completely white and a drop in contrast occurs.
d. In order to erase characters, it is sufficient to apply a horizontal magnetic force line, and conversely, a magnetic pen having horizontal magnetic force lines causes a failure because it rapidly erases a character written by itself.

  When a magnetic field is applied to the microcapsule 186 by a magnetic pen (not shown) on the top sheet 182, black magnetic particles in the microcapsule 186 migrate to the front side in response to magnetic field lines in the vertical direction of the magnetic pen. Thus, when the magnetic pen is moved on the top sheet 182, the magnetic particles in the microcapsule 186 migrate in accordance with the movement, and an image is formed. On the other hand, when the image is erased, small particles migrate to the surface side in response to the magnetic lines of force in the horizontal direction of the magnetic eraser 100 on the surface sheet 182, and the image is erased. In this case, it is desirable to provide a constant clearance between the erasing magnet and the top sheet 182 so that many horizontal magnetic lines of force act on the magnetic panel.

  In the above embodiment, the motor and the battery are used as a power source for rotating the magnet. However, the magnetic eraser of the present invention may be replaced by, for example, an elastic spring such as a spring. It is possible to use a deformable member as a power source. For example, a spiral spring may be connected to the rotation shaft of the magnet, the spiral spring may be manually driven to store energy therein, and the energy may be used to rotate the magnet.

  Although the preferred embodiments of the present invention have been described above in detail, the present invention is not limited to the specific embodiments, and various modifications may be made within the scope of the present invention as set forth in the claims. Modifications and changes are possible.

100: magnetic eraser 110: housing 112: bottom 120: magnet 122: rotating shaft 130: rotating mechanism 132, 134: gear 140: motor 150: control base 152: switch 154: user operation unit 160: battery 180: magnetic sheet 200 : Magnetic eraser 210: Small range eraser 220: Housing 230: Magnet 240: Magnetic shield ring 250: Magnetic shield plate

Claims (25)

A magnetic eraser for erasing characters, figures, symbols, etc. drawn on a magnetic sheet or a magnetic panel, comprising:
A housing including a sliding surface for the magnetic sheet and having an inner space formed therein;
At least one first magnet housed within the housing;
Rotating means contained within the housing for rotating the first magnet;
A battery housed in the housing for supplying power to the rotating means;
The magnetic eraser according to claim 1, wherein the distance from the first magnet to the sliding surface is variable. The magnetic eraser according to claim 1, wherein the first magnet includes a plurality of cylindrical or prismatic magnets, and the plurality of cylindrical magnets or prisms are connected in series by an axis. The housing further has a protrusion for erasing characters and the like drawn on the magnetic sheet on a surface different from the sliding surface, and a second magnet is disposed in the inner space of the protrusion. The magnetic eraser according to claim 1. The magnetic eraser according to claim 3, wherein the second magnet is coaxial with the first magnet, and the second magnet also rotates when the first magnet rotates. The rotation axis of the second magnet is connected to the rotation axis of the first magnet via a gear, and the second magnet also rotates when the first magnet rotates. Magnetic eraser. The magnetic eraser according to claim 3, wherein the second magnet is held stationary in the projection. The magnetic eraser according to any one of claims 3 to 6, wherein the magnetic eraser further includes a magnetic shield ring movable along an axial direction of the protrusion in the outer periphery of the protrusion. The magnetic eraser according to claim 7, wherein an erasing range by the projection is adjusted by changing a distance from a tip end of the projection to a magnetic shield ring. The magnetic eraser according to claim 1, wherein the rotating means and the battery are not disposed between the first magnet and the sliding surface. The magnetic eraser according to claim 1, wherein the rotating means and the battery are disposed in a space separated from the space where the first magnet is disposed. The magnetic eraser according to claim 1, wherein the rotating means and the battery are disposed at a position where the distance from the first magnet is the largest in a space where the first magnet is disposed. A magnetic eraser for erasing characters, figures, symbols, etc. drawn on a magnetic sheet or a magnetic panel, comprising:
A housing in which an internal space is formed,
At least one first magnet housed within the housing;
Rotating means contained within the housing for rotating the first magnet;
A battery housed in the housing for supplying power to the rotating means;
The housing includes a bottom surface, a top surface opposite the bottom surface, two opposing side surfaces between the bottom surface and the top surface, and a front bottom surface, a corner portion formed between the top surface and the two side surfaces. A magnetic eraser in which a second magnet is arranged. A magnetic eraser for erasing characters, figures, symbols, etc. drawn on a magnetic sheet or a magnetic panel, comprising:
A housing in which an internal space is formed,
At least one magnet housed within the housing;
Rotating means contained within the housing for rotating the magnet;
A battery housed in the housing for supplying power to the rotating means;
The housing includes a bottom surface, a top surface opposite the bottom surface, and two opposite side surfaces between the bottom surface and the top surface.
A magnetic eraser wherein distances from the central axis of the magnet to the bottom surface, the top surface, and the two side surfaces are different, and the bottom surface, the top surface, and the two side surfaces function as erasing surfaces. A magnetic eraser for erasing characters, figures, symbols, etc. drawn on a magnetic sheet or a magnetic panel, comprising:
A housing in which an internal space is formed,
At least one magnet housed within the housing;
Rotating means contained within the housing for rotating the magnet;
A battery housed in the housing for supplying power to the rotating means;
The housing includes a housing body and a housing tip capable of axial movement relative to the housing body,
A magnetic eraser wherein the distance from the surface of the magnet to the surface of the housing tip is variable. The magnetic eraser according to claim 14, wherein the magnetic eraser further includes a spring member biasing the housing tip away from the housing body. A magnetic eraser for erasing characters, figures, symbols, etc. drawn on a magnetic sheet or a magnetic panel, comprising:
A housing in which an internal space is formed,
At least one magnet housed within the housing;
Rotating means contained within the housing for rotating the magnet;
A battery housed within the housing for supplying power to the rotating means;
A user control for adjusting the resting position of the magnet when the first magnet is not driven by the battery;
Magnetic eraser having. The magnetic eraser according to claim 16, wherein the user operation portion is a rotary knob coaxial with the first magnet, and a part of the rotary screw is exposed to the outside from a groove of the housing. The magnetic eraser according to claim 17, wherein an identification mark for adjusting a stationary position of the magnet is provided on an outer peripheral portion of the rotating knob. The magnet includes a plurality of magnets, each of which is rotatably mounted within the housing, and one of the plurality of magnets selected is rotated by the rotating means.
The magnet according to claim 16 or 17, wherein when said selected one magnet is rotated in a first direction, another adjacent magnet is rotated in a second direction opposite to the first direction. Eraser. The magnetic eraser according to claim 19, wherein at least two magnets of the plurality of magnets are arranged at different distances from the magnetic sheet. The magnetic eraser according to claim 1, wherein the sliding surface is movable so as to change a distance from a rotation axis of the first magnet. 21. The magnetic eraser according to claim 20, wherein the sliding surface is tiltable with respect to the rotation axis of the first magnet. A magnetic eraser for erasing characters, figures, symbols, etc. drawn on a magnetic sheet or a magnetic panel, comprising:
A housing in which an internal space is formed,
At least one first magnet housed within the housing;
Rotating means contained within the housing for rotating the first magnet;
A battery housed in the housing for supplying power to the rotating means;
The housing includes a housing body and a housing tip capable of axial movement relative to the housing body,
A magnetic eraser wherein a second magnet is disposed within the housing tip. The magnetic eraser according to claim 23, wherein the second magnet is simultaneously rotated when the first magnet is rotated. The magnetic eraser according to claim 23 or 24, wherein the distance from the surface of the second magnet to the surface of the housing tip is variable.

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