JP5053525B2 - Pattern formation method - Google Patents

Description

The present invention relates to patterning how to medium coated with paint containing pigment to the substrate.

Conventionally, as a method of forming a designable medium having a design property by applying a paint containing a pigment to a base material, by directly magnetizing and magnetizing an undercoat and / or an intermediate coat film, A “pattern coating method” (see, for example, Patent Document 1), which allows various patterns to appear on the coating film, regardless of the material or shape of the object to be coated, is dispersed in the coating film. By aligning and moving the magnetic powder that is applied by magnetic force, a “patterned coated metal plate manufacturing method” (for example, see Patent Document 2), which can give a pattern with excellent design and discrimination, By providing a resin layer containing a magnetic luster pigment oriented by applying a magnetic field on the light exit side of the light dispersion layer that is dispersed and emitted, a “designable film” that can represent different patterns depending on the observation direction (E.g. Patent Document 3), etc. are disclosed.
JP-A-6-114332 JP-A-8-38992 JP-A-9-94529

  In the prior art described above, the orientation of the pigment is controlled by using a bright pigment having ferromagnetism. The brilliant pigments having ferromagnetism are flaky and acicular ferromagnetic materials alone, those coated with titanium dioxide or iron oxide, mica, silica, alumina, etc., magnetized iron, nickel (Ni), etc. Examples include those coated with a ferromagnetic material. However, since none of these methods can be applied to all ferromagnetic materials, the methods in the prior art are limited, and only a change in luminance is realized, and it is difficult to realize design characteristics rich in variations.

On the other hand, in the conventional magnetic field orientation method, a pigment having a magnetic anisotropy having a mass magnetic susceptibility of 10 ⁻⁶ m ³ / kg (SIunit) or less, mainly composed of a non-ferromagnetic material such as mica, silica, or alumina. Because they could not be moved, these pigments could not be oriented to form a pattern.

The present invention has been made in view of the above circumstances, provided by performing the orientation control of the pigment other than ferromagnetic, conventionally was not possible, the patterning how on the same coated surface The purpose is to do.

In order to solve the above-mentioned problem, the invention according to claim 1 forms a pattern by causing a pigment orientation different from the periphery of the pattern portion to occur in a pattern portion of a medium coated with a paint containing a pigment on a base material. A pattern forming method, wherein the pigment is a paint in which a pigment whose orientation changes in a strong magnetic field environment and a pigment whose orientation does not change in a strong magnetic field environment are mixed, and the orientation is ferromagnetic or ferromagnetic. It is generated by applying a magnetic field of 0.3 Tesla or higher to a magnetic member formed of a paint containing slag adjacent to the medium.
The non-ferromagnetic material refers to a magnetic material other than a ferromagnetic material, and includes a paramagnetic material and a diamagnetic material.

According to invention of Claim 1, a pattern can be formed on the same coating-film surface. According to the first aspect of the present invention, the pattern does not change even when a magnetic field of less than 0.3 Tesla is applied, and a stable pattern is obtained without being affected by a normal permanent magnet.

According to a second aspect of the invention, in the invention according to the first aspect, as the magnetic member by using a ferromagnetic material to form a desired pattern, the adjacent portions of the magnetic member non ferromagnetic region is present It is characterized by using.

According to the second aspect of the present invention, it is possible to express a difference in contrast and a difference in color tone between a pattern and a non-pattern portion. According to the second aspect of the present invention, the magnetic member can be easily manufactured by alternately laminating the ferromagnetic material and the non-ferromagnetic material, and the thickness of the belt-like member can be reduced. A pattern can be obtained.

The invention according to claim 3 is the invention according to claim 1 or 2 , wherein the pigment whose orientation changes in a strong magnetic field environment has a mass magnetic susceptibility of 10 ⁻⁶ m ³ / kg or less and a magnetic anisotropy. It is characterized by using the pigment which has.

According to the invention described in claim 3, by using a pigment having a magnetic anisotropy of 10 ⁻⁶ m ³ / kg or less as a pigment whose orientation changes in a strong magnetic field environment , A stable pattern can be obtained without being affected by the permanent magnet.

The invention of claim 4, wherein, in the invention of any one of claims 1 to 3, the thickness of the base material, you characterized in that the following pattern interval of the ferromagnetic region.

According to the fourth aspect of the present invention, the thickness of the substrate, by the following pattern interval ferromagnetic region, it is possible to obtain a fine pattern.

  According to the present invention, pattern formation can be realized using a non-ferromagnetic pigment in a strong magnetic field environment.

  The pattern forming method of the present embodiment is a pattern forming method on a medium in which a coating material containing a pigment is applied to a base material, and a pattern is formed by generating a magnetic field gradient different from the periphery of the pattern part in the pattern part of the medium. It is characterized by forming.

In the pattern forming method of this embodiment, in addition to the above-described configuration, the magnetic field gradient is generated by applying a magnetic field to a magnetic member formed of a ferromagnetic material or a coating material containing a ferromagnetic material adjacent to the medium. at best, as the magnetic member by using a ferromagnetic material to form a desired pattern, the adjacent portions may be a magnetic member non ferromagnetic region is present.

In addition to the above configuration, the pattern forming method of the present embodiment may apply a magnetic field of 0.3 Tesla or more as a magnetic field, and has a mass magnetic susceptibility of 10 ⁻⁶ m ³ / kg or less as a pigment. It is preferable to use a pigment having a directivity.

The pattern forming method of the present embodiment, in addition to the structure described above, by applying a magnetic field to pass any magnetic field lines in the coating layer of the medium may be oriented pigments, by applying a magnetic field to the magnetic member, strong A magnetic field gradient different from the surroundings may be generated at a portion where the magnetic body and the non-ferromagnetic body are adjacent to each other, and the thickness of the base material is preferably set to be equal to or smaller than the pattern interval of the ferromagnetic region.

  According to this embodiment, a non-ferromagnetic pigment can be used to realize pattern formation in a strong magnetic field environment.

  FIG. 1A is a conceptual diagram of an apparatus to which a pattern forming method according to an embodiment of the present invention is applied. FIG. 1B is an enlarged view of the designable medium shown in FIG. FIG. 1C is a view of the design medium formed by the pattern forming method of this embodiment as viewed from above, and FIGS. 1D and 1E are views of the design medium shown in FIG. It is a figure which shows the orientation state of a pigment typically, and FIG.1 (f) is a modification of the designable medium shown to Fig.1 (a).

In FIG. 1A, reference numerals 1 and 2 denote yokes of an electromagnet. These yokes 1 and 2 are part of one yoke formed in a U-shape (or C-shape), and a coil is wound around a portion (not shown). Between the yokes 1 and 2, some magnetic lines 3a, 3b, 3c,..., 3l are formed. The strength of the magnetic field of the electromagnet is preferably 0.3 T (T is Tesla) or more. The pigment coated with a ferromagnetic material on mica is coated with α-Fe ₂ O ₃ having very weak ferromagnetism for the purpose of obtaining a bronze color, and the mass magnetic susceptibility as a pigment is 10 ^−6. m ³ / kg (SIunit) or less (in the conventional magnetic field orientation technology, γ-Fe ₂ O ₃ and Fe ₃ O ₄ were used as ferromagnetic materials, but this is to increase the magnetic susceptibility, Α-Fe ₂ O ₃ having a low rate has not been used in the past. A pigment composed only of a diamagnetic material requires a magnetic field of 1T or more.

  As shown in FIG. 1B, a designable medium (hereinafter referred to as “medium”) 5 is coated with a coating material 5a containing a glittering pigment on a base material (for example, a nonmagnetic material such as resin, paper, or ceramic) 5b. The pigment has magnetic anisotropy. This pigment has an anisotropic magnetic susceptibility that changes with an electromagnet having a predetermined magnetic field without changing its orientation with a permanent magnet.

  In FIG. 1A, the medium 5 is arranged at a position (A in the figure) where the surface (upper surface in the figure) is aligned with the substantially linear magnetic lines 3g among the magnetic lines 3a to 3l. On the other hand, the medium 5 is arranged at a position (B in the figure) where the surface (the upper surface in the figure) is aligned with the curved magnetic lines 3a and 3b among the magnetic lines 3a to 3l.

  Here, the medium 5 applied with the magnetic field at the position indicated by the arrow A and the medium 5 applied with the magnetic field at the position indicated by the arrow B will be described.

  When the medium 5 to which the magnetic field is applied at the position indicated by the arrow A is observed while the medium 5 is tilted, the color change on the pigment application surface occurs simultaneously on the entire surface. Further, when the medium 5 is cut at a position bb ′ shown in FIG. 1 (c) and the cross section thereof is observed, as shown in FIG. 1 (d), the pigments 9a, 9b, 9c, 9d, 9e Each column is aligned horizontally.

On the other hand, when the medium 5 to which the magnetic field is applied at the position indicated by the arrow B is observed with the medium 5 tilted, the color tone changes continuously on the pigment application surface. That is, as shown in FIG. 5A, when the back side of the medium 5 in the horizontal state is tilted, the belt-like gloss 6 appearing on the near side matches the tilt and the surface of the medium 5 faces the back side. Move up. Further, as shown in FIG. 5B, when the front side of the medium 5 in the horizontal state is tilted, the belt-like gloss 6 appearing on the back side is in accordance with the tilt and the surface of the medium 5 is directed toward the front side. Move up. Further, when the medium 5 was cut at the position bb ′ shown in FIG. 1C and the cross section was observed, the pigments 9a, 9b, 9d and 9e were inclined as shown in FIG. 1E. The pigments 9a to 9e are in an alignment state of “convex upward with the vertex 9a” as a whole.
Here, FIG. 5A and FIG. 5B are perspective views schematically showing an example of a change in color tone of the design medium according to the first embodiment of the present invention.

A medium 50 shown in FIG. 1 (f) is composed of a base material 5b made of a diamagnetic resin and a paint 5c formed in a desired pattern shape on the base material 5b and containing a ferromagnetic material.
By arranging such a medium 50 on one of the magnetic lines of force 3a to 3l such as the position indicated by the arrow A or the position indicated by the arrow B in FIG. 1A, the diamagnetic material of the paint 5c is oriented. A pattern with no color tone is formed.

The medium 5 was formed and evaluated using the materials shown below.
(combination)
UV resin UV flexo varnish (TOKA) 10 parts by weight Pigment Infinite R-08 (Shiseido) 1 part by weight A paint of the above combination is applied on a PET sheet with a wire bar # 34, and remains strong in a wet state. Under a magnetic field (1T) environment, the film was exposed to a place where the lines of magnetic force are curved (for example, position B in FIG. 1A) for 5 minutes, and then UV irradiation was performed to fix the coating film.

  Then, when the formed medium 5 was tilted and observed, a continuous change in color tone was observed such that the band-like gloss moved in the tilted direction as shown in FIGS. 5 (a) and 5 (b). It was. Further, in this medium, when the cross section at the position bb ′ shown in FIG. 1C was observed, the pigments 9a, 9b, 9d and 9e were inclined as shown in FIG. 1E. Thus, it was confirmed that the pigments 9a to 9e were in an orientation state of “convex upward with 9c as a vertex” as a whole.

  In this way, it is possible to form a designable medium that uses a paint containing a luster pigment having an anisotropic magnetic susceptibility and causes a unique color change due to a magnetic field gradient in a strong magnetic field environment (1T). is there.

  In this embodiment, the case where the pattern formed on the medium is 11 parallel lines has been described. However, the present invention is not limited to this, and a curve, a circle, an ellipse, an oval, a polygon, Any shape of a character, a code, and a combination thereof may be used. Further, the pigment is not limited to the present embodiment, and other types of pigments may be used as long as the transmittance changes according to the change in orientation.

  FIG. 2A is a conceptual diagram of an apparatus to which a pattern forming method according to an embodiment of the present invention is applied, and FIG. 2B is an enlarged view of the magnetic member and the medium shown in FIG. 2 (c) is an enlarged view of FIG. 2 (b), and FIG. 2 (d) is a modification of the magnetic member shown in FIG. 2 (a).

  In FIG. 2A, reference numerals 1 and 2 denote electromagnet yokes. These yokes 1 and 2 are part of one yoke formed in a U-shape (or C-shape), and a coil is wound around a portion (not shown). Between the yokes 1 and 2, some magnetic lines 3a, 3b, 3c,..., 3l are formed. The strength of the magnetic field of the electromagnet is preferably 0.1 T or more.

  In FIG. 1 (a), a magnetic member 4 is disposed at a position (position indicated by an arrow A in the figure) along the surface (upper surface in the figure) along the substantially linear magnetic force line 3g among the magnetic force lines 3a to 3l. A medium 5 is disposed on the substrate 4 (the magnetic member 4 is supported by a support member made of a nonmagnetic material (not shown) such as ceramic). On the other hand, the magnetic member 4 is disposed at a position (position indicated by an arrow B in the figure) along the surface (upper surface in the figure) of the magnetic force lines 3a to 3l along the curved magnetic force lines 3a to 3d. The medium 5 is arranged.

  The magnetic member 4 shown in FIG. 2B has a non-ferromagnetic region such that the ferromagnetic region 4a is formed in a desired pattern shape on at least one surface (the upper surface in the figure) and is adjacent to the ferromagnetic region. (For example, a diamagnetic material, a paramagnetic material, or a weak magnetic material) 4b is formed. For example, as a magnetic member, a belt-shaped member made of a ferromagnetic material and a belt-shaped member made of a non-ferromagnetic material are used. The laminated body laminated | stacked alternately is mentioned.

  Here, examples of the ferromagnetic material include iron, nickel, and cobalt, and examples of the diamagnetic material include aluminum and copper.

  The medium 5 is obtained by applying a coating material 5a containing a pigment to a base material (for example, a nonmagnetic material such as resin, paper, or ceramic) 5b, and the pigment has magnetic anisotropy. This pigment has an anisotropic magnetic susceptibility that does not change in orientation with a permanent magnet but changes with an electromagnet having a predetermined magnetic field.

  In the magnetic member 40 shown in FIG. 2C, the plate-like member 40a made of a ferromagnetic material is etched using a photolithography technique so that a pattern remains, and the non-ferromagnetic material 40b is embedded in the obtained groove. Is.

4A is a plan view of the medium shown in FIG. 2A, and FIG. 4B is a cross-sectional view taken along line IVb-IVb in FIG. 4A.
As shown in FIGS. 4A and 4B, the portion of the paint 5a that is not in contact with the non-ferromagnetic material region 4b of the magnetic member 4 (see FIG. 2A) or the magnetic member 4 (air: anti-reverse) The region corresponding to the magnetic body) is horizontally oriented along the magnetic field lines, and the region corresponding to the ferromagnetic region 4a of the magnetic member 4 is oriented vertically due to the influence of the ferromagnetic region 4a. It has become. As a result, the state of the pigment of the paint 5a in the medium 5 changes. That is, the parallel line pattern of the magnetic member 4 is reflected on the medium 5, and a pattern 5ap having the same shape as the pattern is formed. In such a state, the paint 5a is solidified by applying a means for solidifying the paint to the medium, for example, ultraviolet rays (heat). After removal from the magnetic member 4, the orientation of the pigment in the medium 5 is fixed, and the orientation does not change even when the medium 5 is brought into contact with the permanent magnet.

  Here, in FIG. 2A, the medium 5 applied with the magnetic field at the position indicated by the arrow A and the medium 5 applied with the magnetic field at the position indicated by the arrow B will be described.

  As shown in FIG. 3A, the medium 5 to which the magnetic field is applied at the position indicated by the arrow A has a pattern 8 formed using the magnetic member at the center of the surface. When the medium 5 is tilted and observed, color change occurs on the surface of the pattern 8 and on the surface around the pattern 8 (surface other than the portion of the pattern 8).

  Here, FIG. 3A is a view of the design medium according to one embodiment of the present invention as viewed from above, and FIG. 3B, FIG. 3C, and FIG. It is sectional drawing which shows typically the orientation state of the pigment in the pattern part of the medium shown to a).

  On the surface around the pattern 8, the color change occurs simultaneously on the entire surface in the same manner as in the first embodiment. When cutting is performed at the position bb ′ shown in FIG. 3A and the cross section is observed, FIG. In the same manner as shown in Fig. 8, the respective rows of the pigments 9a, 9b, 9c, 9d, 9e are aligned horizontally.

  On the surface of the pattern 8, the color tone changes continuously. That is, as the medium in the horizontal state is tilted, the belt-like gloss moves on the pattern surface in the direction opposite to the tilted direction. For example, when the medium 5 is inclined toward the front side, the belt-like gloss moves toward the back side.

  Further, when the medium 5 is cut at the position aa ′ shown in FIG. 3A and the cross section thereof is observed, the cross section shows the pigments 9a, 9b, and 9d as shown in FIG. 3B. 9e and 9e are inclined, and the pigments 9a to 9e are in an alignment state of “convex downward with the peak at 9c” as a whole.

  On the other hand, the medium 5 to which the magnetic field is applied at the position indicated by the arrow B also has a pattern 8 formed using the magnetic member at the center of the surface, as shown in FIG. When tilted and observed, color change occurs on the surface of the pattern 8 and on the surface around the pattern 8 (surface other than the portion of the pattern 8).

  Both the surface of the pattern 8 and the surface surrounding the pattern 8 undergo a continuous change in color tone. That is, as shown in FIG. 6 (a), when the back side of the medium 5 in the horizontal state is tilted, the belt-like gloss 6 that appears on the near side appears on the back side in accordance with the tilt on the surface around the pattern 8. Further, on the surface of the pattern 8, the belt-like gloss 7 moves on the pattern surface in a direction opposite to the inclined direction (front side). Further, as shown in FIG. 6B, when the front side of the horizontal medium 5 is tilted, a belt-like gloss 6 appearing on the back side is formed on the front side in accordance with the tilt on the surface around the pattern 8. Further, on the surface of the pattern 8, the belt-like gloss 7 moves on the pattern surface in a direction (back side) opposite to the inclined direction.

  Further, when the medium 5 is cut at the positions aa ′ and bb ′ shown in FIG. 3A and the cross sections thereof are observed, the cross section aa ′ is shown in FIG. 3B. As described above, the pigments 9a, 9b, 9d and 9e are in an inclined orientation, and the pigments 9a to 9e are in an orientation state of “convex in the bottom with 9c as a vertex” as a whole, and b−b ′. In the same manner as shown in FIG. 1 (e), the cross-section of the pigments 9a, 9b, 9d, and 9e is inclined, and the pigments 9a to 9e are generally “upwardly convex with 9c as the apex. ”Orientation.

  In this embodiment, the case where the pattern formed on the medium is 11 parallel lines has been described. However, the present invention is not limited to this, and a curve, a circle, an ellipse, an oval, a polygon, Any shape of a character, a code, and a combination thereof may be used. Further, the pigment is not limited to the present embodiment, and other types of pigments may be used as long as the transmittance changes according to the change in orientation.

Media were formed and evaluated using the materials shown below.
(combination)
UV resin UV flexo varnish (TOKA) 10 parts by weight Pigment Infinite R-08 (Shiseido) 1 part by weight The paint of the above combination is applied onto a PET sheet with a wire bar # 34, and the coated surface remains wet. In a state where the magnetic field lines are curved in a strong magnetic field (1T) environment with a pattern made of Fe and Al in close contact with the opposite surface (for example, a position indicated by an arrow B in FIG. 2A) ) For 5 minutes, followed by UV irradiation to fix the coating.

  Then, when the formed medium 5 is tilted and observed, as shown in FIGS. 6A and 6B, the belt-like gloss moves continuously on the pattern surface and the other surfaces. Color change was observed. Further, in this medium 5, when the cross sections aa ′ and bb ′ shown in FIG. 3A were observed, the cross section aa ′ was a pigment as shown in FIG. 3B. 9a, 9b, 9d, and 9e are inclined, and the pigments 9a to 9e are in an overall orientation state of “convex downward with 9c as a vertex”, and the cross section of bb ′ is As shown in FIG. 1 (e), the pigments 9a, 9b, 9d, and 9e are in an inclined orientation, and the pigments 9a to 9e are in an orientation state of "convex upward with 9c as a vertex" as a whole. It was recognized that

  As described above, as a result of pattern formation using a magnetic field gradient using a paint containing a bright pigment having an anisotropic magnetic susceptibility in a strong magnetic field environment (1T), a bright pigment such as a pearl pigment can be obtained. It has a great influence on the color tone change, and two types of color tone change can be performed in one kind of one-layer coating film. In addition, pigments that do not normally change orientation can also change orientation.

  In the above, it is possible to form an unprecedented pattern having a specific color tone change without using multilayer coating by using a paint in which one kind of pigment is dispersed.

  In each of the above embodiments and examples, when the anisotropic magnetic susceptibility of the pigment is a positive value, the pigment is oriented horizontally with respect to the magnetic lines of force, so that the medium is within the magnetic lines of force along the angle at which the pigment is to be oriented. By arranging, the orientation can be controlled. In addition, when the anisotropic magnetic susceptibility of the pigment is negative, the pigment is oriented perpendicular to the magnetic field lines, so the orientation can be controlled by placing the medium in the magnetic field lines perpendicular to the angle at which the pigment is to be oriented. It becomes.

  In each of the above embodiments and examples, since the upright pigment falls when the solvent evaporates, the medium in which the glitter pigment is dispersed is used as a solvent-free resin (for example, ultraviolet curable resin, thermoplastic resin, heat It may be formed of a cured resin or the like.

  As shown in FIGS. 2 (a) and 2 (b), a portion of the paint 5a that is not in contact with the non-ferromagnetic region 4b of the magnetic member 4 (see FIG. 1 (a)) or the magnetic member 4 (air: anti-reverse) The region corresponding to the magnetic body) is horizontally oriented along the magnetic field lines, and the region corresponding to the ferromagnetic region 4a of the magnetic member 4 is oriented vertically due to the influence of the ferromagnetic region 4a. It has become. As a result, the state of the pigment of the paint 5a in the medium 5 changes. That is, the parallel line pattern of the magnetic member 4 is reflected on the medium 5, and a pattern having the same shape as that pattern is formed. In such a state, the coating material 5a is solidified by applying a means for solidifying the coating material to the medium, for example, ultraviolet rays (heat). After removal from the magnetic member 4, the orientation of the pigment in the medium 5 is fixed, and the orientation does not change even when the medium 5 is brought into contact with the permanent magnet.

Media were formed and evaluated using the materials shown below.
(Combination 1)
UV resin UV flexo varnish (TOKA) 10 parts by weight Pigment A SECURE SHIFT (Flex Products) 1 part by weight Pigment B IRIODIN 1 part by weight (combination 2)
UV resin UV flexo varnish (TOKA) 10 parts by weight Pigment A SECURE SHIFT (Flex Products) 1 part by weight (combination 3)
UV resin UV flexo varnish (TOKA) 10 parts by weight Pigment C Magnetic pearl pigment (Merck) 1 part by weight The paint of the above combination 1 to 3 is applied onto a PET sheet with a wire bar # 34 and remains wet. A pattern made of Fe and Al was adhered to the coated surface and the opposite surface, and exposed to a strong magnetic field (1T) environment for 5 minutes, and then UV irradiation was performed to fix the coating film to form a pattern. The results are shown in Table 1.

  As described above, as a result of pattern formation using a magnetic field gradient using a paint in which a pigment whose orientation changes in a strong magnetic field environment (1T) and a pigment whose orientation does not change, the orientation does not normally change. The pigment can also change its orientation.

In the above, it is possible to form a peculiar pattern in a strong magnetic field environment using a paint in which two kinds of pigments having different anisotropic magnetic susceptibility are dispersed.
In the present embodiment, the case where a bright pigment is used has been described. However, the present invention is not limited to this, and other types of pigments may be used as long as the transmittance changes according to the change in orientation. May be used.

  INDUSTRIAL APPLICABILITY The present invention can be used for forming a fine color tone or a pattern such as a pattern, a figure, or a character different from the surroundings on the coating film surface.

(A) is the conceptual diagram of the apparatus which applied the pattern formation method based on one Example of this invention, (b) is an enlarged view of the designable medium shown to (a), (c) is this implementation It is the figure which looked at the designable medium formed with the pattern formation method of an example from the upper part, (d) And (e) is a figure which shows typically the orientation state of the pigment in the designable medium shown to (c). (F) is a modification of the designable medium shown in (a). (A) is the conceptual diagram of the apparatus which applied the pattern formation method based on one Example of this invention, (b) is an enlarged view of the magnetic member and medium shown to (a), (c) is ( It is an enlarged view of b), (d) is a modification of the magnetic member shown in (a). (A) is the figure which looked at the designable medium which concerns on one Example of this invention from upper direction, (b), (c), (d) is orientation of the pigment in the pattern part of the medium shown to (a). It is sectional drawing which shows a state typically. FIG. 4A is a plan view of the medium shown in FIG. 2A, and FIG. 4B is a sectional view taken along line IVb-IVb in FIG. (A) And (b) is a perspective view which shows typically an example of the color tone change of the designable medium which concerns on the 1st Example of this invention. (A) And (b) is a perspective view which shows typically an example of the color tone change of the designable medium which concerns on the 2nd Example of this invention.

Explanation of symbols

Yoke 3a-3l Magnetic field lines 4, 40 Magnetic member 4a, 40a Ferromagnetic region 4b, 40b Non-ferromagnetic region 5 Medium 5a Paint 5b Base material

Claims (4)

  A pattern forming method for forming a pattern in a pattern portion of a medium in which a paint containing a pigment is applied to a base material by causing orientation of a pigment different from the periphery of the pattern portion, wherein the pigment is used in a strong magnetic field environment. Using a paint in which a pigment whose orientation changes and a pigment whose orientation does not change in a strong magnetic field environment are mixed, and the magnetic member formed of the ferromagnetic material or the paint containing the ferromagnetic material is adjacent to the medium. A pattern forming method characterized in that the pattern is generated by applying a magnetic field of 0.3 Tesla or higher to the processed material.   2. The pattern forming method according to claim 1, wherein a desired pattern is formed using a ferromagnetic material as the magnetic member, and a magnetic member having a non-ferromagnetic material region in an adjacent portion is used. ^3. The pattern formation according to claim 1, wherein the pigment whose orientation changes in a strong magnetic field environment is a pigment having a mass magnetic susceptibility of 10 ⁻⁶ m ³ / kg or less and having magnetic anisotropy. Method. The thickness of the substrate, patterning how to any one of claims 1 to 3, characterized in that the following pattern interval of the ferromagnetic region.

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