CN113272150A

CN113272150A - Magnetic pen

Info

Publication number: CN113272150A
Application number: CN201980088261.4A
Authority: CN
Inventors: 古贺律生
Original assignee: Zero Lab Co Ltd
Current assignee: Zero Lab Co Ltd
Priority date: 2019-01-11
Filing date: 2019-01-11
Publication date: 2021-08-17
Also published as: JP6889509B2; WO2020144837A1; JPWO2020144837A1

Abstract

Provided is a magnetic pen for a magnetic panel, which has magnets capable of drawing at both ends. The magnetic pen (1) has sliding sections (40A, 40B) at both ends of a main body (10). The sliding part (40A) comprises a cylindrical holding body (42A) and a plurality of magnets (44) are arranged in the inner space of the holding body, and the sliding part (40B) comprises a cylindrical holding body (42B) and a plurality of magnets (44) are arranged in the inner space of the holding body. The outer diameter or inner diameter of the sliding section (40A) is smaller than the outer diameter or inner diameter of the sliding section (42A), the sliding section (40A) is used for drawing thin characters, and the sliding section (40B) is used for drawing thick characters. The magnetic pen (1) is also provided with an erasing cap (50) in a detachable mode.

Description

Magnetic pen

Technical Field

The present invention relates to a magnetic pen capable of drawing arbitrary characters, figures, symbols, and the like by applying a magnetic field to a display panel including a magnetic display body.

Background

When a magnetic pen having a magnet attached to its tip is drawn on a magnetic panel including a magnetic display body, a magnetic field from the magnetic pen acts on the display body, and characters, figures, symbols, and the like corresponding to a movement trajectory of the magnetic pen can be displayed on the magnetic panel. As for a magnetic pen that applies a magnetic field to a magnetic panel, for example, patent document 1 discloses a magnetic pen that alleviates a pen pressure applied to the magnetic panel with a simple structure. Further, patent documents 2 to 4 disclose magnetic panels in which magnetic particles are encapsulated in microcapsules to form recording layers.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2009-935

Patent document 2: japanese patent laid-open No. 2007-256891

Patent document 3: japanese patent No. 2717536

Patent document 4: japanese patent No. 4089808

Disclosure of Invention

Problems to be solved by the invention

The conventional magnetic pen has a function of drawing characters, graphics, and the like, but does not have a function of appropriately changing a line width of drawing or partially erasing the drawn characters, and is not very convenient for a user. For example, when characters with a large line width are drawn on a magnetic panel, a magnetic pen for bold characters is used for drawing, and when characters with a small line width are drawn, the magnetic pen for fine characters must be used instead for drawing. In the case of writing wrong characters or the like during the drawing, it is necessary to replace the magnetic pen with a magnetic erasing tool (eraser) and erase the corresponding portion and then replace it with the magnetic pen again.

The present invention has been made to solve the above conventional problems, and an object of the present invention is to provide a magnetic pen which is highly convenient for a user.

Means for solving the problems

The magnetic pen of the present invention is used for drawing characters, figures, and the like on a magnetic panel, and comprises: a grip portion for gripping; a first holder member attached to one end of the grip portion; a second holder member attached to the other end of the grip portion; a first magnet disposed in the internal space of the first holder member; and a second magnet disposed in an internal space of the second holder member, wherein the first holder member is used for drawing bold characters, and the second holder member is used for drawing fine characters.

Preferably, the magnetic pen further includes an erasing cap which is detachable from either one of the both end portions of the grip portion,

the erasing cap includes a magnet for erasing therein, and the erasing cap accommodates the first holder or the second holder therein when the erasing cap is attached to the grip portion. Preferably, a surface of the first magnet is disposed at a position not exceeding an end face of the first holder member, and a surface of the second magnet is disposed at a position not exceeding an end face of the second holder member. Preferably, the first magnet is disposed such that at least one S pole and at least one N pole are opposed to the magnetic panel. Preferably, the first holder member has an outer diameter or an inner diameter larger than an outer diameter or an inner diameter of the second holder member. Preferably, the first holder member includes a magnetic material in the center thereof. Preferably, the erasing cap further comprises a rotating unit for rotating the magnet. Preferably, the erase cap further comprises a switch for rotating the magnet. Preferably, the erasing cap has a felt member at a front end portion.

The magnetic pen of the present invention is used for drawing characters, figures, and the like on a magnetic panel, and comprises: a grip portion for gripping; a holder member attached to one end of the grip portion; an erasing part mounted on the other end of the holding part; a first magnet disposed in the internal space of the holder member; and a second magnet attached to the erasing section, wherein the holder member is used for drawing characters on the magnetic panel, and the erasing section is used for erasing the characters drawn on the magnetic panel.

Preferably, the erasing part includes a rotating unit for rotating the second magnet. Preferably, the erasing part includes a magnetic force adjusting unit for adjusting a magnetic force of the second magnet. Preferably, the magnetic force adjusting means includes a magnetic member slidable in an axial direction of the grip portion.

Effects of the invention

According to the present invention, since the first holder member and the second holder member are provided at both end portions of the magnetic pen, characters and the like can be drawn on the magnetic panel using the first holder member or the second holder member by inverting the magnetic pen. Further, by attaching an erasing cap to an unused end portion of the magnetic pen and reversing the magnetic pen, characters and the like to be drawn can be easily erased.

Drawings

Fig. 1 is a diagram showing an overall configuration of a magnetic pen according to a first embodiment of the present invention, fig. 1 (a) is a front view of the magnetic pen with an erase cap removed, fig. 1 (B) is a side view of one end portion of the magnetic pen, and fig. 1 (C) is a side view of the other end portion of the magnetic pen.

Fig. 2 is a perspective view of a magnetic pen according to a first embodiment of the present invention.

Fig. 3 is a cross-sectional view of the magnetic pen shown in fig. 1 (a) taken along line a-a, fig. 3 (a) is a view showing a state where the erasing cap is removed, fig. 3 (B) is a view showing a state where the erasing cap is attached, and fig. 3 (C) is a view showing a state where the erasing cap is attached to both end portions.

Fig. 4 (a) shows an example of a ball joint portion of the slide portion of the tip of the magnetic pen, and fig. 4 (B) and 4 (C) show other joint portions of the slide portion of the tip of the magnetic pen.

Fig. 5 shows a structure of a sliding portion of a magnetic pen according to a first embodiment of the present invention, in which fig. 5 (a) is a schematic cross-sectional view and fig. 5 (B) is a schematic perspective view.

Fig. 6 is a sectional view showing the structure of a magnetic panel of a magnetic pen capable of using the first embodiment of the present invention.

Fig. 7 (a) is a diagram illustrating an operation of a magnetic pen according to a first embodiment of the present invention, and fig. 7 (B) is a diagram illustrating an operation of a magnetic pen as a comparative example.

Fig. 7A is a diagram showing an example of arrangement of magnets of a thin letter holding member of a magnetic pen according to a first embodiment of the present invention.

Fig. 8 is a diagram showing an example of the configuration of a magnet of a magnetic pen applicable to the first embodiment of the present invention.

Fig. 8A is a diagram showing an example of the configuration of a magnet of a magnetic pen applicable to the first embodiment of the present invention.

Fig. 9 is a schematic sectional view showing a configuration of a magnetic pen according to a second embodiment of the present invention.

Fig. 10 is a schematic sectional view showing a structure of a sliding portion of a magnetic pen according to a third embodiment of the present invention.

Fig. 10A is a diagram illustrating an operation of a chamfered portion of a sliding portion of a magnetic pen according to a third embodiment of the present invention.

Fig. 11 is a sectional view showing a schematic configuration of a magnetic pen according to a fourth embodiment of the present invention.

Fig. 12 is a schematic cross-sectional view showing the structure of a joint part of a magnetic pen according to a fifth embodiment of the present invention.

Fig. 13 is a schematic cross-sectional view illustrating a mechanism for attaching and detaching a distal end portion of a magnetic pen according to a sixth embodiment of the present invention.

Fig. 14 is a schematic cross-sectional view illustrating the structure of an erase cap of a magnetic pen according to a seventh embodiment of the present invention.

Detailed Description

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 pen includes magnets for drawing at both ends thereof, and a magnetic field is applied to a magnetic sheet of a magnetophoretic type, a magnetic inversion type, or the like, so that characters, figures, pictures, or the like can be drawn on the magnetic sheet. Note that the structures shown in the drawings described in the embodiments of the present invention are different from the actual sizes.

[ examples ] A method for producing a compound

Fig. 1 is a front view of a magnetic pen according to a first embodiment of the present invention and a side view of the tip portions of both ends thereof, fig. 2 is a perspective view of the magnetic pen, and fig. 3 is a sectional view taken along line a-a of fig. 1 (a). In addition, fig. 3 (a) shows a state in which the erase cap is removed, and fig. 3 (B) shows a state in which the erase cap is attached.

The magnetic pen 1 of the present embodiment includes a pen-shaped cylindrical grip (main body) 10 and

tip portions

20A and 20B (which may be collectively referred to as tip portions 20) attached to both ends of the grip 10. The shape of the grip portion 10 is arbitrary, and may be a prism (for example, a cross section of a triangle, a quadrangle, or a polygon). The grip portion 10 does not necessarily have to be of uniform thickness, and may be formed in a tapered shape with a tapered tip end portion, or a concave portion or a convex portion that can be easily gripped by a user may be formed on the surface of the grip portion 10. The material of the grip portion 10 is arbitrary, and is made of, for example, plastic, metal, or the like.

The

distal end portions

20A, 20B include, for example,

cylindrical portions

22A, 22B and

conical portions

24A, 24B, which gradually decrease the outer diameter of the grip portion 10, and have a shape similar to a pencil as a whole. In a preferred example, the grip portion 10 is hollow, and supports 12A and 12B having a slightly smaller diameter are formed at both ends. As shown in fig. 3,

columnar portions

22A, 22B of

distal end portions

20A, 20B are fitted into openings of

support portions

12A, 12B and fixed to openings of

support portions

12A, 12B.

The

cylindrical portions

22A, 22B are connected to the

conical portions

24A, 24B, and sliding

portions

40A, 40B are attached to the tips of the

conical portions

24A, 24B via

joint portions

30A, 30B. When the slide portion 40 moves horizontally on the magnetic panel, the

joint portions

30A and 30B can change the angle of the grip portion 10 in the axial direction arbitrarily. In other words, when the user slides the slide portion 40 in the horizontal direction while holding the grip portion 10, the angle of the grip portion 10 in the axial direction is arbitrarily changed via the joint portion 30 while maintaining the horizontal posture of the slide portion 40 with respect to the plane of the magnetic panel.

The

joint portions

30A and 30B are universal joints in which the

distal end portions

20A and 20B are coupled to the sliding

portions

40A and 40B, and the structure thereof is arbitrary. In one example, as shown in fig. 4 (a), the joint portion 30 may be a spherical joint including a spherical ball portion 32, and the ball portion 32 may be rotatably engaged in a semicircular groove 42 formed in the surface of the sliding portion 40. Preferably, when the grip portion 10 is tilted, the tilt angle can be maintained to some extent by the frictional force between the ball portion 32 and the groove 42.

The joint portion may have a structure shown in fig. 4 (B). In this case, the distal end portion 26 of the grip portion 10 includes an inner space extending in the axial direction, and the spring 34 and the wire 36 are disposed in the inner space. The wire 36 is preferably a flexible wire, such as a stranded wire made of stainless steel or the like. One end of the spring 34 is fixed to the tip end 26, and the other end is connected to the wire 36. The other end of the wire 36 passes through the open end of the distal end 26 and is connected to the sliding portion 40 via the through hole of the connecting portion 38 (for example, spot welding). The coupling portion 38 has a spherical groove 38A formed in a surface thereof, and the open end of the distal end portion 26 slidably contacts the surface of the groove 38A. The bottom surface of the coupling portion 38 is coupled to the sliding portion 40. The contact pressure between the tip end portion 26 and the slide portion 40 can be adjusted by the spring 34. Fig. 4 (C) shows a state in which the tip end portion 26 is inclined at an angle with respect to the slide portion 40. The portion where the tip portion 26 contacts the coupling portion 38 functions as a fulcrum, and the state of the angle when the grip portion 10 is tilted can be maintained to some extent by adjusting the force of the spring 34.

Fig. 1 (B) shows the sliding portion 40A as viewed from the axial direction of the grip portion 10, and fig. 1 (C) shows the sliding portion 40B as viewed from the axial direction of the grip portion 10. The sliding

portions

40A and 40B include cylindrical holding

bodies

42A and 42B (hereinafter, may be collectively referred to as holding bodies 42). The

holders

42A and 42B are preferably made of a magnetic material, and the

holders

42A and 42B have an internal space (for example, a columnar internal space) for holding the magnets formed therein.

Fig. 5 (a) is a schematic cross-sectional view of the sliding portion 40A, and fig. 5 (B) is a schematic perspective view of the sliding portion 40A. The holding body 42 has a cylindrical internal space 43, and two magnets 44-1 and 44-2 are disposed in the internal space 43. In one example, the holding body 42 is made of a magnetic material such as iron or soft iron. The inner space 43 has a depth d from the end face E of the holding body 42A. The magnets 44-1, 44-2 are, for example, cylindrical and magnetized to have S and N poles in the axial direction thereof. In a preferred embodiment, the magnets 44-1, 44-2 are of the same size and are arranged in the internal space 43 with the S-pole and N-pole reversed, and the surfaces of the magnets 44-1, 44-2 are located at positions recessed by Δ d from the end face E so as not to exceed the end face E. That is, the S-pole of magnet 44-1 and the N-pole of magnet 44-2 face each other on the magnetic face plate. Δ d depends on the intensity of the magnetic flux of the magnet or the diameter thereof, but is, for example, about 0.1 to 0.5mm, preferably about 0 to 0.3 mm.

The sliding portion 40B is also configured similarly. In the example of fig. 1 (C), the plurality of magnets 44 are disposed in the holder 42B such that four S poles and four N poles are exposed toward the open end. In this case, the S poles and the N poles are alternately arranged, and the surface of the magnet 44 is located at a position not exceeding the end face E of the holder 42B.

In a preferred example, since the sliding portion 40A is in a thin font and the sliding portion 40B is in a thick font, the outer diameter (inner diameter of the internal space) of the holder 42B is larger than that of the holder 42A, and the holder 42B accommodates a larger number of magnets 44. In the example shown in fig. 1 (B) and 1 (C), the magnet 44 is cylindrical, and when it is arranged along the circumferential direction of the holder 42, a large space is formed in the center of the holder 42B for bold letters. By arranging a magnet 46 or a magnetic body such as iron in the space and forming magnetic lines of force also in the center portion, it is possible to prevent the occurrence of a blur in the center of a line segment or the like when a bold character is drawn.

The magnetic pen 1 of the present embodiment may further include an erasing cap 50 that is detachable from the

distal end portions

20A and 20B of the grip portion 10. As shown in fig. 3 (a), the magnetic cap 50 includes a cylindrical housing 54 having an internal space formed therein, and a flat surface 52 for facilitating sliding is formed at the front end of the housing 54. The flat surface 52 may be made of a felt material, for example, so that ink of a marker pen for a whiteboard drawn on the magnetic panel can be erased. A circular magnet 56 is disposed in the inner space of the housing 54. The magnet 56 applies a magnetic field to the magnetic panel via the flat surface 52, thereby erasing characters and the like depicted on the magnetic panel. The case 54 can be made of any material, but for example, by being made of a magnetic material, the magnetic field of the magnet 56 can be prevented from leaking to the outside of the case 54, and the region corresponding to the outer dimension of the case 54 can be erased. Alternatively, the housing 54 may be made of a resin material, and a magnetic sheet may be bonded to the inner wall of the housing 54.

Further, the outer diameter and the inner diameter of the housing 54 are arbitrary, and the outer diameter of the magnet 56 housed in the housing 54 may be arbitrary. For example, the outer diameter of the housing 54 may be rectangular, the inner diameter may be cylindrical, and the outer diameter of the magnet 56 may be rectangular. Further, the erase cap 50 may have one or more magnetic bodies interposed between the magnet 56 and the flat surface 52. By appropriately selecting the permeability, shape, size, position, number of laminations, and the like of the magnetic body, the strength or distribution of the magnetic field in the x, y, and z directions of the magnet 56 can be controlled by the magnetic body, and the magnetic field optimum for erasure can be generated.

The housing 54 is detachably attached to one of the

support portions

12A and 12B at both ends of the grip portion 10. For example, the inner diameter of the housing 54 is slightly larger than the outer diameter of the

support portions

12A, 12B, so that the housing 54 is held by the

support portions

12A, 12B with a certain frictional resistance. Alternatively, the

support portions

12A and 12B may be tapered to facilitate attachment and detachment of the housing 54. Further, a convex portion or a concave portion may be formed in a part of the

support portions

12A and 12B, and a concave portion or a convex portion that engages with the convex portion or the concave portion may be formed on the inner surface of the housing 54. For example, when the sliding portion 40A for bold characters is used, the magnetic cap 50 is attached to the support portion 12B so as to accommodate the sliding portion 40B.

In addition, the erase cap 50 can double as a protective cap. That is, by attaching the erasing cap 50 to the grip portion 10, the holding

bodies

40A and 40B at the distal end portions can be protected. Therefore, when the holding

bodies

40A and 40B at both ends of the grip portion 10 are to be protected, as shown in fig. 3 (C), the erase caps 50 are attached to both ends. As long as the

support portions

12A, 12B of the grip portion 10 have the same diameter, the same shape member can be used for the erasing cap 50.

Next, fig. 6 shows an example of a magnetic panel that can be drawn by the magnetic pen of the present embodiment. The magnetic panel 100 is a transparent sheet that can transmit a magnetic field, and includes: a surface sheet 110 constituting a display surface of the magnetic panel; a back sheet 120 facing the front sheet 110; and a plurality of microcapsules 130 arranged two-dimensionally in a space between the front sheet 110 and the back sheet 120. The plurality of microcapsules 130 are housed in a casing, not shown.

Preferably, one or more magnetic particles having a particle size of 0.1 to 1.0 μm, one or more magnetic particles having a particle size of 1 to 20 μm, nonmagnetic particles such as white titanium oxide, a dispersion, and an additive are contained in, for example, a transparent spherical capsule of the microcapsule 130. The size of the microcapsules is, for example, 50 to 650 μm. Such a magnetophoretic magnetic panel is disclosed in, for example, patent document 4, and has the following features.

a. Small particles on a horizontal magnetic line tend to react in the direction of the magnetic line.

b. In a magnetic pen having perpendicular magnetic lines, large and small magnetic particles react to blacken the surface side, and characters can be drawn.

c. When the small particles are erased from the surface of the magnetic panel, if only horizontal magnetic lines of force act on the small particles that are easily reacted on the horizontal magnetic lines, the small particles migrate in the direction of the magnetic lines of force and turn white. In this case, since the large particles hardly react, they are always in a "black" state, and when viewed from the surface, they are visible as black, and therefore, they are not whitened at all, and the contrast is lowered.

d. In contrast, a magnetic pen having horizontal magnetic lines of force automatically erases written characters immediately, which causes a problem.

One microcapsule 130 forms one pixel. For example, as shown in fig. 6 (B), when a magnetic field is applied to the microcapsules 130 by the magnetic pen 1 on the surface sheet 110, as described above, the black magnetic particles in the microcapsules 130 react to the magnetic lines of force in the vertical direction of the magnetic pen and migrate to the surface side. As described above, if the magnetic pen 10 is moved on the surface sheet 110, the magnetic particles in the microcapsules 130 are migrated in accordance with the movement, and an image is formed. On the other hand, when erasing an image, an erasing magnet (not shown) is slid on the surface sheet 110, and small particles are migrated to the surface side in response to the horizontal magnetic lines of force of the erasing magnet, thereby erasing the image. In this case, it is preferable to provide a certain distance between the erasing magnet and the surface sheet 110, so that a large amount of horizontal magnetic lines of force act on the magnetic panel.

The microcapsules 130 are not necessarily limited to the above configuration, and for example, the magnetic panel may be erased from the front side or the back side. Further, the magnetic panel may be a magnetic sheet of a magnetic inversion type, in addition to a magnetophoretic type. Further, the magnetic panel 100 may be of a type that can erase a drawn image by applying a magnetic field from the front sheet 110 side or a type that can erase a drawn image by applying a magnetic field from the back sheet 120 side.

Next, the operation of the magnetic pen 1 of the present embodiment will be described. Fig. 7 (a) schematically shows magnetic lines of force generated from the magnets 44-1, 44-2 of the sliding portion 40A of the present embodiment. In the present embodiment, the surfaces of the magnets 44-1, 44-2 are present at recessed positions not protruding from the end face E of the cylindrical member 42A made of a magnetic material, and therefore, the magnetic force lines M1 from the N-pole of the magnet 44-2 toward the S-pole of the magnet 44-1 are concentrated in the radial direction so as not to exceed the holding body 42A. In other words, magnetic lines of force from the outermost shell of the N pole of the magnet 44-2 enter the S pole through the side wall 46 of the holding body 42A, while magnetic lines of force from the N pole of the magnet 44-1 enter the S pole of the magnet 44-1 through the side wall 46 of the holding body 42A, and the magnetic lines of force are blocked in the radial direction. That is, magnetic lines of force from the N-pole surface of the magnet 44-2 toward the S-pole surface of the magnet 44-1, which act on the microcapsules 130 of the magnetic panel, extend in the vertical direction and are confined within the radius of the holder 42A. As a result, the magnetic particles in the microcapsule 130 acted on by the magnetic lines of force in the vertical direction within the limited range migrate, for example, to the surface side.

As another mode, as shown in fig. 7 (C) and 7 (D), the opening end of the holding body 42A may be formed with a brim 45 extending inward in the radial direction. The eaves 45 can be formed by plastic working such as bending an end of the holding body 42, and the end face E in this case is a bottom face of the eaves 45. The eaves 45 defines the size of the opening for exposing the magnets 44-1 and 44-2, and the eaves 45 adjusts the magnetic lines or fields of the magnets acting on the magnetic panel by changing the size of the opening. For example, if the opening is made large, the magnetic lines of force of the magnet can be expanded in the radial direction, and if the opening is made small, the expansion of the magnetic lines of force of the magnet in the radial direction is suppressed. Therefore, by appropriately selecting the length of the brim 45 in the radial direction, the types of the lines or the line widths of the

holders

42A, 42B for bold characters or for fine characters can be adjusted.

On the other hand, fig. 7 (B) is a comparative example, schematically showing magnetic lines of force when the magnets 44-1, 44-2 protrude from the end face E of the holding body 42A. In this case, the surfaces of the magnets 44-1, 44-2 protrude from the end face E, and therefore the magnetic field lines Q from the N-pole of the magnet 44-2 toward the side wall 46 of the holder 42A extend slightly in the horizontal direction. When the magnetic force lines Q extending in the horizontal direction act on the microcapsules 130, the magnetic particles in the capsules are subjected to a magnetic force in the erasing direction, for example, the magnetic particles migrate toward the back surface side, and instead, the white non-magnetic particles are subjected to a magnetic force that migrates toward the front surface side, and as a result, characters are drawn by the magnetic force lines Q1 at the center of the holder 42A, and the edges of the characters drawn by the magnetic force lines Q at the outer edge are erased, thereby forming an image with unclear edges or outlines. Further, in the magnetic panel, since the force with which the magnetic field lines in the horizontal direction attract the magnetic particles is weak, black and white are mixed in the portion, and thus an image with unclear edges may be obtained.

Further, in the case where the holding body 42A is made of a nonmagnetic material such as brass even if it is made of metal, since the magnetic lines of force of the magnets 44-1 and 44-2 include a portion which slightly spreads in the horizontal direction beyond the radial direction of the holding body 42A, the magnetic lines of force in the erasing direction or the magnetic lines of force weakening the force of attracting the magnetic particles act on the edge of the drawn image for the above reason, and characters and the like become unclear.

One magnet may be disposed in the

holders

42A, 42B so that one S pole or one N pole faces the magnetic panel side. In fig. 7A (a), the S-pole of one magnet 48 is exposed so as to face the magnetic panel side. In particular, when a thin letter is drawn, the outer diameter of the holder also becomes small, and the magnet is also reduced in size along with this, and therefore the magnet is disposed so that one of the S pole and the N pole is exposed. Further, the surface of the magnet 48 is disposed at a position not exceeding the end face E of the holding body as described above. In fig. 7 (B), the N-pole of one magnet 49 is exposed so as to face the magnetic panel side. In this example, Δ d is 0 as the position of the surface of the magnet 49 not exceeding the end face E.

Next, fig. 8 shows a configuration example of a magnet applicable to the present embodiment. Fig. 8 (a) shows an example in which the magnetic member 80 is disposed in a gap or space in the holding body 42. By disposing the magnetic member 80 in the gap, magnetic flux can be concentrated in the holding body 42. Fig. 8 (B) shows an example in which magnets of S-pole and N-pole are arranged so as to coincide with the internal space of the holder 42. In this case, the magnet may be a physical one. Fig. 8 (C) shows a modification of the magnet shown in fig. 8 (B), and is obtained by disposing an annular magnet having a through hole formed in the center portion thereof in the holder 42. In this case, for example, a cylindrical magnetic body may be disposed in the gap in the center portion as in fig. 8 (a). Fig. 8 (D) shows an example in which an annular magnet having one physical shape, in which two N poles and two S poles are formed on one surface, is disposed in the holder 42. In this case, for example, a cylindrical magnetic body may be disposed in the gap in the central portion.

The sizes of the magnets housed in the holder 42 may be different from each other. For example, as shown in fig. 8 (E), the magnet of the N pole exposed to the magnetic panel side may be larger than the magnet of the S pole, or conversely, as shown in fig. 8 (F), the S pole may be larger than the N pole.

As shown in fig. 8G, a magnetic body (e.g., a shaft or a magnet such as soft iron) 80 may be disposed in the gap between the central portions of the four magnets to prevent the magnetic lines of force in the central portions from weakening. As shown in fig. 8 (H), the magnets may be arranged in a diamond shape so that a large gap is not formed in the central portion. In this case, the internal space of the holding body 42 may be formed in a rhombic shape. Further, as shown in fig. 8 (I), two N poles and one S pole may be arranged. Alternatively, five magnets may be arranged as shown in fig. 8 (J), or six magnets may be arranged as shown in fig. 8 (K). Further, as shown in fig. 8 (L), a magnet including an S pole and an N pole on a surface of one end portion may be disposed such that the S pole and the N pole alternate, or a magnetic body 80 may be disposed at the center thereof.

Fig. 8A shows another example of the structure of the magnet that can be applied to the present embodiment. When a plurality of magnets are arranged in the holder, if the contact surface between the magnets is small, that is, if the gap between the magnets is large, streaks are likely to occur on the drawing line. As shown in fig. 8 (G) and (L), by disposing the magnetic body 80 in the gap, the magnetic lines of force in the central portion can be prevented from being weakened, and in addition, for example, as shown in fig. 8A and 8A (B), when a plurality of

magnets

44A, 44B, 44C, and 44D are disposed in the holder 42, the contact surface between the magnets is increased, so that the gap is not generated as much as possible, and the occurrence of streaks of drawn lines can be suppressed. The example of fig. 8A (a) is an example of combining four quadrangular prism-shaped magnets 44. In this case, for example, as shown in fig. 7 (C), the holding body 42 has an end portion formed with a brim 45, and the bottom surfaces of the four magnets abut against the brim 45. The example of fig. 8A (B) is an example of a combination of four prisms having an outer edge of 1/4 in the shape of an arc. Alternatively, two prisms having semicircular outer edges may be combined. Further, in the example of fig. 8A (C), when two magnets are arranged in the holder 42, the contact surface of the magnets is made flat so that the contact surface of the magnets is increased.

Next, a second embodiment of the present invention will be explained. The magnetic pen of the second embodiment is characterized by an erasing cap attached to the grip portion 10. The erasing cap 50A of the second embodiment includes a driving mechanism for driving a built-in magnet. Figure 9 shows a diagrammatic cross-sectional view of an erase cap of a second embodiment. In this figure, the erase cap 50A includes: a cylindrical housing 200 having a space formed therein; a disk-shaped magnet 210 housed in the case 200 and magnetized with S and N poles; a motor 220 coupled to a central portion of the magnet 210 and rotating the magnet 210; a drive unit 230 including an electronic circuit and the like for driving the motor 220; a battery 240; and a switch 250 mounted to a surface of the housing 200. As shown in the figure, the disk-shaped magnet 210 has S and N poles magnetized in the rotation direction or the radial direction, and the S and N poles face the magnetic face plate. However, the shape of the magnet is not limited to a disk shape, and for example, the magnet may be a bar-shaped magnet 210A, in which case, the S-pole and the N-pole are magnetized on the surface thereof, and the S-pole and the N-pole face the magnetic panel at the time of erasing.

The user turns on the switch 250 when starting erasing through the erase cap 50A and turns off the switch 250 when ending the erasing. When the switch 250 is turned on, the driving unit 230 supplies electric power from the battery 240 to the motor 220, thereby rotating the disc-shaped magnet 210. The magnetic field lines from the N-pole to the S-pole change as the magnet 210 rotates, and particularly, the horizontal magnetic field lines act on the microcapsules, thereby efficiently erasing the pattern drawn on the magnetic panel.

The erasing cap 50A may be detachably attached to one end of the grip portion 10, as in the first embodiment, or may be attached to both ends of the grip portion 10 as shown in fig. 9 (C). Alternatively, as shown in fig. 9 (D), the erase cap 50 of the first embodiment may be attached to one end of the grip portion 10, and the erase cap 50A of the second embodiment may be attached to the other end. The erasing cap 50A may be used in a state detached from the grip portion 10, that is, in a state in which the erasing cap 50A itself acts on the magnetic panel. Further, the shape of the tip of the magnetic cap 50A is not limited to the spherical shape, and may be a flat surface that slides easily on the surface of the magnetic panel, and a felt material as shown in fig. 3 may be attached to the tip.

Next, a modified example of the second embodiment will be explained. The switch 250 can include an input for switching the rotational speed of the motor 220. Characters and the like drawn on the magnetic panel may be difficult to erase over time. By changing the rotation speed of the motor 220, appropriate magnetic lines of force can be applied to the magnetic panel, and erasure can be facilitated. For example, the switch 250 includes inputs such as high speed, medium speed, and low speed.

Next, a third embodiment of the present invention will be explained. The third embodiment relates to a structure of a slider of a magnetic pen, and fig. 10 (a) shows a schematic cross-sectional view thereof. The sliding part 300 of the third embodiment is a composite member including a plastic body 310 and a holder 320 made of a magnetic material embedded in the plastic body 310. The plastic body 310 has a substantially cylindrical shape, and the joint portion 30 is connected to an upper end portion 312 thereof. An opening is formed in the center of the bottom surface 314 of the plastic body 310, and the holding body 320 is accommodated in the opening. In one example, the plastic body 310 is integrally molded to be embedded in the holder 320, and the bottom surface 314 of the plastic body 310 is substantially flush with the end surface E of the holder 320. The holding body 320 has a structure as shown in fig. 5, and one or more magnets are disposed inside the holding body. The plastic body 310 has a large flat bottom surface 314, and thus when sliding on a magnetic panel, the horizontal posture of the sliding portion 300 is stabilized with respect to the surface of the magnetic panel, thereby ensuring that the axial direction of the holder 320 is vertical with respect to the surface of the magnetic panel.

Fig. 10 (B) and 10 (C) show modifications of the sliding portion of the third embodiment. The sliding portion 300A shown in fig. 10 (B) has a chamfered portion 330 formed at a corner of the plastic main body 310, and the sliding portion 300B shown in fig. 10 (C) has a chamfered portion 340 formed at a corner of the plastic main body 310. By forming such

chamfered portions

330 and 340, the horizontal posture of the sliding

portions

300A and 300B with respect to the surface of the magnetic panel is further stabilized. That is, when the sliding portion 300 slides on the magnetic panel, even if the sliding portion 300 cannot follow the sliding direction and rotates, the chamfered portion comes into contact with the surface of the magnetic panel, and the rotation of the sliding portion 300 returns to bring the bottom surface of the sliding portion 300 into contact with the surface of the magnetic panel. Therefore, the sliding portion easily maintains a horizontal posture with respect to the surface of the magnetic panel, and sliding becomes easy. The

chamfered portions

330 and 340 also have a function of preventing damage to the surface of the magnetic panel. In the above embodiment, the holder 300 made of a magnetic material is housed in the plastic body 310, but the plastic body 310 may be made of another material, for example, resin or rubber having excellent sliding properties.

Next, a specific operation when a chamfered portion (taper) is formed at the corner of the sliding portion will be described. Fig. 10A (a) is a schematic view showing a state when drawing is performed by the slide portion 300 (see fig. 10A) in which the chamfered portion is not formed, and fig. 10A (B) is a schematic view showing a state when drawing is performed by the slide portion 300A (see fig. 10B) in which the chamfered portion 330 is formed. Here, the grip angle θ is defined as an angle formed by the axial direction of the grip 10 and the plane of the surface piece 110 of the magnetic panel. When the chamfered portion is not formed at the corner of the sliding portion 300, as shown in fig. 10A (a), the fulcrum 350 at which the sliding portion 300 contacts the surface sheet 110 is shifted to the left side from the vertical line V perpendicular to the surface of the magnetic panel, and therefore the sliding portion 300 receives a force in the direction of the arrow f1, and the bottom surface 314, which is the magnet surface, of the sliding portion 300 cannot contact the surface sheet 110 of the magnetic panel. On the other hand, when the chamfered portion 330 is formed at the corner of the slide portion 300A, as shown in fig. 10A (B), the fulcrum 360 at which the slide portion 300A contacts the surface piece 110 is shifted to the right side from the vertical line V, and therefore, a force f2 in the opposite rotational direction to f1 is received, and the bottom surface 314, which is the magnet surface, of the slide portion 300A contacts the surface piece 110 of the magnetic panel, so that a stable drawing operation can be performed.

Next, a fourth embodiment of the present invention will be explained. Fig. 11 (a) is a schematic sectional view of a magnetic pen according to a fourth embodiment. In the magnetic pen 400 of the fourth embodiment, the slide portion 40A (holding body 42A) is attached to one end portion of the grip portion 10 in the same manner as in the first embodiment, and the erasing portion 410 is provided at the other end portion. The erasing part 410 includes a sliding member 412 having a flat surface made of felt material or the like and an erasing magnet 414. In one example, the sliding member 412 is bonded to the closed end of the grip portion 10 with an adhesive or the like, and the erasing magnet 414 is disposed in the internal space of the grip portion 10. When the sliding member 412 is slid on the magnetic panel, magnetic lines of force from the erasing magnet 414 act on the magnetic panel, and the pattern or the like drawn on the magnetic panel is erased. Preferably, the position of the erasing magnet 414 is selected so that the magnetic field lines in the horizontal direction from the erasing magnet 414 effectively act on the magnetic panel. As described above, the magnetic body 413 may be interposed between the magnet 414 and the sliding member 412 in order to control the strength or direction of the magnetic field of the magnet 414.

Fig. 11 (B) shows an example of the protective cap 420 to which a slider for protecting the magnetic pen 400 is attached. Protective cap 420 includes a case having a space formed therein, and is detachably attached to grip portion 10 so as to accommodate slide portion 40A in the internal space. Further, the erasing cap 50 described in the first embodiment also has a function of protecting the sliding portion 40A when attached to the grip portion 10 in the same manner.

Fig. 11 (C) shows another modification of the slide portion 40A for protecting the magnetic pen 400. In this example, as shown in the drawing, a slide member 430 is attached to the outer periphery of the grip portion 10 so as to be slidable in the axial direction thereof. The slide member 430 is a cylindrical member having an inner diameter slightly larger than the outer diameter of the grip portion 10, and when the magnetic pen 400 is used, the slide member 430 slides to the right side to expose the slide portion 40A, and when the magnetic pen 400 is not used, the slide member 430 slides to the left side to cover the slide portion 40A. Although not shown, a positioning mechanism for fixing the position of the slide member 430 may be provided on the surface of the grip portion 10 and/or on the inner side of the slide member 430. For example, a convex portion may be provided on the surface of the grip portion 10, a concave portion may be provided on the inner surface of the protective slide 430, and the slide member 430 may be stopped at a desired position by engaging the convex portion with the concave portion.

In the magnetic pen of fig. 11 (D), the slide portion 40A is attached to one end of the grip portion 10, and the erasing portion 440 including a magnet rotating mechanism is provided at the other end. The erasing part 440 has the function of the erasing cap 50A described in the second embodiment, which is housed in the inner space of the grip 10.

Fig. 11 (E) shows a magnetic pen including a magnetic force variable mechanism of the erasing portion. The erasing part 440 further includes a cylindrical sliding member 450 made of a magnetic material. The cylindrical sliding member 450 can slide in the axial direction X outside the grip portion 10, and the position of the sliding member 450 can be changed, whereby the magnitude of the magnetic field generated by the magnet of the erasing portion 440 and the direction of the magnetic lines of force can be changed. When erasing a graphic or the like drawn on the magnetic panel, the user can adjust the erasable range by adjusting the position of the slide member 450. For example, if the sliding member 450 is slid toward the distal end side, the range of the magnetic lines in the radial direction is narrowed, and a small erasing range can be obtained, whereas if the sliding member 450 is slid toward the grip portion side, the magnetic lines are expanded in the radial direction, and a large erasing range can be obtained.

Next, a fifth embodiment of the present invention will be explained. The fifth embodiment is characterized by having a joint portion between the slide portion 40 and the grip portion 10. As shown in fig. 12 (a), an elongated support member 500 extending in the axial direction is attached to an end of the grip portion 10. The elongated support member 500 has an arc-shaped or spherical end 502, and the end 502 abuts against a semicircular groove of the coupling portion 38 as shown in fig. 4. A sliding portion 40 is fixed to the bottom surface of the coupling portion 38. Further, a coil spring 520 is interposed between the surface of the slide portion 40 and the end of the grip portion 10. One end of the coil spring 520 is fixed to the grip portion 10, and the other end is fixed to the surface of the slide portion 40, and the coil spring 520 generates tension in a direction in which the grip portion 10 and the slide portion 40 are attracted to each other. The end 502 of the support member 500 is brought into contact with the groove of the coupling portion 38 with a constant pressure by the tension of the spring. As shown in fig. 12 (B), when the user grips the grip portion 10 and slides the slide portion 40 on the magnetic panel, the grip portion 10 is tilted with respect to the slide portion 40 while maintaining the horizontal posture of the slide portion 40. At this time, since the end 502 of the support member 500 is in contact with the coupling portion 38 at a constant contact pressure, the inclination angle of the grip portion 10 is maintained to some extent, and the user can easily perform drawing.

Next, a sixth embodiment of the present invention will be explained. In the sixth embodiment, as shown in fig. 13, the magnetic pen has a structure in which the

tip portions

20A, 20B can be replaced. The distal end portion 20A is detachably attached to an opening of one support portion 12A of the grip portion 10, and similarly, the distal end portion 20B is detachably attached to an opening of the other support portion 12B of the grip portion 10. The sliding

portions

40A and 40B are attached to the

distal end portions

20A and 20B via joint portions, but the joint portions may be broken or damaged, or the sliding

portions

40A and 40B may be worn out due to long-term use. In this case, it is necessary to replace the

distal end portions

20A, 20B, and new

distal end portions

20A, 20B are attached to the

support portions

12A, 12B. In a preferred embodiment, as shown in fig. 13 (B), by making inner diameter D1 of the opening of

support portions

12A, 12B equal to D2 and making the diameters of

columnar portions

22A, 22B of

distal end portions

20A, 20B equal,

distal end portions

20A, 20B can be attached to either of

support portions

12A, 12B. When D1 ≠ D2 is provided,

distal end portions

20A and 20B having diameters corresponding to inner diameters D1 and D2 of

support portions

12A and 12B are attached.

Next, a seventh embodiment of the present invention will be explained. In the seventh embodiment, as shown in fig. 14 (a), the erasing cap 50B does not incorporate a battery, and the battery is incorporated in the grip portion 10. The erasing cap 50B includes a disc-shaped magnet 210, a motor 220, and a driving unit 230 in a case 200, and a battery 240 in the grip unit 10. Further, a switch 250 for starting the operation of the erasing cap 50B is attached to the grip portion 10. When the switch 250 is opened, the power from the battery 240 is supplied to the connector terminal 600 via a wiring not shown. The connector terminal 600 has a positive electrode terminal and a negative electrode terminal on the outer periphery of the support portion 12B, for example. On the other hand, a connector terminal 610 is mounted inside the housing 200, and the connector terminal 610 is connected to a circuit board such as the driver 230 via a wiring not shown. The connector terminal 610 has a positive terminal and a negative terminal.

When the housing 200 is attached to the grip portion 10, the connector terminal 600 is connected to the connector terminal 610, and when the switch 250 is opened, the power from the battery 240 is supplied to the driving portion 230. The

connector terminals

600 and 610 are constituted by, for example, a male terminal and a female terminal which are detachable.

By incorporating the battery 240 in the grip portion 10, a battery having a larger capacity can be used as compared with a case where a battery is incorporated in the erasing cap 50B, and the operational life and the driving ability can be increased. Further, the erase cap 50B can be reduced in size and weight. In the above example, the switch 250 is provided in the grip portion 10, but the switch 250 may be provided in the erasing cap 50B.

While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the specific embodiments, and various modifications and changes can be made within the scope of the present invention described in the claims. The present invention may include the first to fifth embodiments individually, or may include any combination of the first to fifth embodiments.

Description of the reference symbols

1: a magnetic pen; 10: a grip (main body); 20A, 20B: a front end portion; 30A, 30B: a joint portion; 40A, 40B: a sliding part; 42A, 42B: a holding body; 44: a magnet; 46: a magnetic body; 50. 50A: erasing the cap; 100: a magnetic panel; 110: a surface sheet; 120: a back sheet; 130: microcapsules; 200: a housing; 300: a sliding part; 310: a plastic body; 320: a holding body; 400: a magnetic pen; 410: an erasing section; 500: a support member; 520: a coil spring.

Claims

1. A magnetic pen for drawing characters, figures, etc. on a magnetic panel, wherein,

the magnetic pen has:

a grip portion for gripping;

a first holder member attached to one end of the grip portion;

a second holder member attached to the other end of the grip portion;

a first magnet disposed in the internal space of the first holder member; and

a second magnet disposed in the internal space of the second holder member,

the first retainer part is used to depict bold type,

the second holder member is for depicting a fine font,

the first magnet is disposed such that at least one S pole and at least one N pole face the magnetic panel.

2. The magnetic pen of claim 1,

the magnetic pen further comprises an erasing cap which is freely assembled and disassembled relative to any one of the two end parts of the holding part,

the erasing cap includes an erasing magnet therein, and the erasing cap receives the first holder member or the second holder member therein when the erasing cap is attached to the grip portion.

3. The magnetic pen of claim 1,

the surface of the first magnet is arranged at a position not exceeding the end face of the first holder member,

the surface of the second magnet is disposed at a position not exceeding the end surface of the second holder member.

4. The magnetic pen of claim 1,

the first retainer part has an outer or inner diameter that is larger than an outer or inner diameter of the second retainer part.

5. The magnetic pen of claim 1 or 3,

the first holder member and the second holder member include a first magnetic portion and a second magnetic portion made of a magnetic material, respectively, and a first magnet and a second magnet are disposed in the first magnetic portion and the second magnetic portion.

6. The magnetic pen of claim 5,

the first holder member includes a first slide member including the first magnetic body,

the second holder member includes a second slide member including the second magnetic body,

the first sliding member allows the first magnetic body to easily slide on the surface of the magnetic panel,

the second sliding member allows the second magnetic body to easily slide on the surface of the magnetic panel.

7. The magnetic pen of claim 6,

the first and second slide members have bottom surfaces identical to the first and second magnetic bodies.

8. The magnetic pen of claim 6 or 7,

a chamfer is formed at a corner portion of the first slide member and the second slide member.

9. The magnetic pen of claim 1,

the magnetic pen further has:

a first universal joint coupling one end of the grip portion to the first holder member; and

a second universal joint coupling the other end of the grip portion to the second holder member.

10. The magnetic pen of claim 9,

the first universal joint comprises:

a connection part which is connected with the first retainer member and is provided with a hemispherical groove on the surface;

an extending portion that extends from the one end portion and whose tip abuts against the groove of the coupling portion; and

and a biasing portion that biases the extending portion toward the coupling portion so that a tip of the extending portion is in contact with the groove of the coupling portion at a constant contact pressure.

11. The magnetic pen of claim 10,

the force application part comprises:

a flexible wire connected to the first retainer part; and

and a spring connected to the flexible wire and pulling the first holder member toward the first end portion.

12. The magnetic pen of claim 10,

the urging portion includes a coil spring interposed between the first holder member and the one end portion, and the coil spring pulls the first holder member toward the first end portion.

13. The magnetic pen of claim 1,

the first holder member includes a magnetic material in the center thereof.

14. The magnetic pen of claim 2,

the erase cap also includes a rotation unit for rotating the magnet.

15. The magnetic pen of claim 14,

the erase cap also includes a switch for rotating the magnet.

16. The magnetic pen of claim 15,

the grip portion includes a battery therein, a first terminal for supplying power to the battery is provided at an end portion of the grip portion, and the erasing cap is provided with a second terminal connectable to the first terminal.

17. The magnetic pen of claim 14,

the magnet in the erase cap has an N-pole and an S-pole magnetized in a direction perpendicular to a rotation axis of the rotation unit.

18. The magnetic pen of claim 2,

the wiping cap has a felt member at a front end portion.

19. The magnetic pen of claim 1,

the first holder member and the second holder member are removable from the grip portion and replaceable.

20. The magnetic pen of claim 19,

a first opening portion having a first diameter is formed at one end portion of the grip portion, a second opening portion having a second diameter is formed at the other end portion,

the first holder member has a first portion insertable into the first opening, and the second holder member has a second portion insertable into the second opening.

21. The magnetic pen of claim 20,

the first diameter is equal to the second diameter.

22. A magnetic pen for drawing characters, figures, etc. on a magnetic panel, wherein,

the magnetic pen has:

a grip portion for gripping;

a holder member attached to one end of the grip portion;

an erasing part mounted on the other end of the holding part;

a first magnet disposed in the internal space of the holder member; and

a second magnet attached to the erasing part,

the holder member is used for drawing characters and the like on the magnetic panel,

the erasing unit erases characters and the like depicted on the magnetic panel.

23. The magnetic pen of claim 22,

the erasing part includes a rotating unit for rotating the second magnet.

24. The magnetic pen of claim 22,

the erasing part includes a magnetic force adjusting unit for adjusting a magnetic force of the second magnet.

25. The magnetic pen of claim 24,

the magnetic force adjusting unit includes a magnetic member slidable in an axial direction of the grip portion.

26. The magnetic pen of claim 24,

the magnetic pen further has a universal joint for joining one end of the grip portion to the holder member,

the universal joint includes:

a connecting part which is combined with the holding body component and is provided with a hemispherical groove on the surface;

27. The magnetic pen of claim 22,

the holder member includes a magnetic body portion made of a magnetic material, and a first magnet is disposed in the magnetic body portion.

28. The magnetic pen of claim 27,

the holder member includes a slide member including the magnetic body,

the sliding member has the same bottom surface as the magnetic body portion to facilitate sliding of the magnetic body portion on the surface of the magnetic panel.

29. The magnetic pen of claim 27 or 28,

a chamfer is formed at a corner portion of the sliding member.