JP4116051B2 - Pattern forming method and apparatus - Google Patents

Description

  The present invention forms a coating film by applying an uncured coating material containing flat magnetic powder on an object to be coated which is a non-magnetic material, and the coating film is applied to the coating film in an uncured state. On the other hand, the present invention relates to a pattern forming method and an apparatus for aligning the magnetic powder along the lines of magnetic force by applying a magnetic field with a magnet and forming a pattern on the coating film by the orientation of the magnetic powder.

Conventionally, for example, Patent Document 1 discloses a method of applying a paint containing magnetic powder on the surface of an object to be coated and then orienting the magnetic powder by a magnetic field of a magnet to form a patterned coating film in which characters and figures are raised. Is disclosed. In this pattern coating film forming method, a plurality of separated magnet pieces are arranged close to each other so as not to contact each other to form a dot pattern aggregate, and the back surface of the object to be coated is positioned close to the aggregate. . Next, a coating containing a flat magnetic powder is applied to the object to be coated to form a coating film, and the magnetic powder is oriented along the lines of magnetic force by the magnet pieces while the coating film is uncured. Then, a pattern corresponding to the dot pattern is formed, and the coating film is cured to cause the pattern having a strong light reflection amount to appear on the coating film surface.
Japanese Patent No. 2844232

  However, since the conventional pattern coating film forming method forms a dot pattern assembly using a plurality of magnet pieces, a large number of magnet pieces are required, and the operation of forming the assembly is troublesome. However, the shape of the dot pattern is restricted by the shape of, for example, a cylindrical magnet piece, and it is difficult to form a pattern of any shape. In particular, it is difficult to implement a thin pattern, for example, because a large number of small magnet pieces must be prepared.

  The present invention solves the above-described problems in the prior art, can easily form a pattern of any shape on the coating film, simplifies the structure of the pattern forming apparatus, and reduces costs. It is an object of the present invention to provide a pattern forming method and apparatus capable of easily forming a fine pattern having an arbitrary shape as required.

  In order to solve the above problems, the invention described in claim 1 forms a coating film by applying a coating containing a flat magnetic powder on the surface of an object to be coated. Next, when a magnet having a surface of the same polarity along the surface is disposed on the surface side of the coating film, and the magnetic powder in the coating film is in a movable state, a magnetic field is applied to the coating film by the magnet. Apply. Then, by drying and curing the coating film in a state where the magnetic powder is oriented by a magnetic line of force substantially parallel to the surface generated in the stepped portion formed of, for example, a groove formed on the surface of the magnet, A pattern is formed with magnetic powder.

  According to a second aspect of the present invention, an object to be coated is disposed on the surface of a magnet having a surface having the same polarity. Next, a coating film is formed by applying a coating containing flat magnetic powder on the surface of the object to be coated, and when the magnetic powder in the coating film is in a movable state, it is applied by the magnet. Apply a magnetic field to the film. Then, by drying and curing the coating film in a state where the magnetic powder is oriented by a magnetic line of force substantially parallel to the surface generated in the stepped portion formed of, for example, a groove formed on the surface of the magnet, A pattern is formed with magnetic powder.

  The invention according to claim 3 is a pattern formation in which a magnetic field is applied to the coating film applied to the upper surface of the object by a magnet so that the magnetic powder in the coating film is oriented by the lines of magnetic force to form a pattern. In the apparatus, a stepped portion made of, for example, a groove that generates a magnetic force line substantially parallel to the surface of the magnet is formed.

According to a fourth aspect of the present invention, in the third aspect, the step portion of the magnet is formed by a concave portion or a convex portion.
(Function)
In the present invention, the magnetic powder in the coating film is oriented so that the magnetic powder in the coating film is substantially orthogonal to the surface of the coating film by the magnetic force lines substantially orthogonal to the surface generated on the surface of the magnet. The magnetic powder in the coating film is locally oriented substantially parallel to the surface of the coating film by magnetic lines of force substantially parallel to the surface generated in the part, and the magnetic powder appears as a pattern.

  The present invention can easily form a pattern of an arbitrary shape on the coating film, reduce the number of magnets, simplify the structure of the pattern forming apparatus, and reduce the cost. Further, a fine pattern having an arbitrary shape can be easily formed as necessary.

Hereinafter, an embodiment of a pattern forming method embodying the present invention will be described with reference to the drawings.
As shown in FIG. 1, a single plate-like magnet is disposed above a plate-like object 12 made of a nonmagnetic material such as a synthetic resin supported on the upper surface of a table 11 made of a nonmagnetic material such as wood. 13 is arranged in parallel with the upper surface of the article 12 by a support member (not shown). As shown in FIG. 6, a coating material 15a containing an infinite number of magnetic powders 14 is applied to the upper surface of the object 12 to form a coating film 15 having a uniform thickness.

  The plate-like magnet 13 is formed by a plate-like rubber magnet in the shape of a plane long rectangle as shown in FIG. 2, and the planar surface 13a has the same polarity as the N pole, and the back surface 13b has the same polarity as the whole. The S pole is magnetized. The rubber magnet is formed by mixing raw material magnetic powder (ferrite magnet powder, samcoba magnet powder, or neodymium magnet powder), nylon resin, rubber, additives, and the like. Here, the plate shape is a concept including not only a plate shape but also a thickness called a sheet shape or a block shape. Further, the planar shape of the plate-like magnet 13 is not limited to a rectangular shape, and may be any shape other than a polygonal shape such as a square, a triangle, and a hexagon, a circle, an ellipse, and the like. This plate-like magnet 13 constitutes a pattern forming apparatus.

  On the surface 13a of the plate-like magnet 13, a groove constituting the picture pattern 17 is cut and formed as shown in FIG. This picture pattern 17 is formed by a square groove 17a and a round groove 17b as stepped portions. The grooves 17a and 17b are formed by a processing tool such as an end mill that is numerically controlled based on a processing program stored in advance in a storage medium of a processing device (not shown). The pattern 17 of the plate magnet 13 can also be formed by the following method. That is, a pre-magnetized sheet-like rubber magnet to be a square plate magnet is prepared, and grooves 17a and 17b to be the pattern 17 are formed on the surface of the rubber magnet by a processing tool such as an end mill of the processing apparatus. After that, the surface 13a is magnetized so as to be an N pole and the back surface 13b is an S pole.

  The coating material 15a is obtained by dissolving a thermoplastic resin in a solvent. As the thermoplastic resin, a thermoplastic resin having good solubility in a solvent and having a viscosity characteristic that can increase the viscosity of the coating material 15a exponentially as the solvent is volatilized from the solution is used. As a thermoplastic resin having such a viscous characteristic, for example, there is a vinyl acetate-vinyl chloride copolymer resin of a vinyl acetate resin. The coating material 15a is applied so that the film thickness of the coating film 15 is in the range of, for example, 5 μm to 50 μm after drying.

  As shown in FIG. 1, the magnetic powder 14 is oriented along the lines of magnetic force when a magnetic field is applied by the plate-like magnet 13, and imparts a pattern to the coating film 15. Therefore, as the magnetic powder 14, a flat shape, specifically a flake shape, a plate shape, a sheet shape, a film shape or the like is used so that light can be reflected. The magnetic powder 14 is formed of a known ferromagnetic material such as iron oxide, nickel, cobalt, or an alloy thereof. The size of the magnetic powder 14 is, for example, about 1 to 80 μm in length and about 0.1 to 20 μm in thickness.

  Next, lines of magnetic force (magnetic field) generated in the plate magnet 13 will be described with reference to FIGS. The analysis of this magnetic field was performed using the three-dimensional magnetic field analysis software “EFL / MAGIC” of Elf Co., Ltd. (5-1-18 Miyahara, Yodogawa-ku, Osaka).

  In FIG. 3, the magnetic lines of force 21 from the north pole of the surface 13 a of the plate magnet 13 to the south pole of the back surface 13 b are indicated by arrows. As indicated by this arrow, the magnetic lines of force 21 are directed in a direction substantially perpendicular to the surface 13a from a portion of the surface 13a of the plate-like magnet 13 which is a predetermined distance away from the groove 17a. In the vicinity of the outer peripheral edge 13 c of the plate magnet 13, there is a portion where the direction of the lines of magnetic force 21 is substantially parallel to the surface 13 a.

  The direction of the lines of magnetic force near the square grooves 17a of the picture pattern 17 is as shown in FIG. Further, the direction of the lines of magnetic force in the vicinity of the round groove 17b is as shown in FIG. In FIG. 4, there are lines of magnetic force 21 from the left and right edges e1, e2 of the outer end of the square groove 17a to the left and right corners e3, e4 of the bottom surface. In FIG. 5, there are lines of magnetic force 21 from the left and right edges e1, e2 of the outer end toward the center O of the bottom surface in the round groove 17b. However, the direction of the magnetic lines of force 21 from the surface 13a of the plate-like magnet 13 to the outside (the lower side of FIGS. 4 and 5) is substantially the same for both the square groove 17a and the round groove 17b.

  Therefore, as shown in FIG. 1, a coating film 15 a is applied to the upper surface of the article 12 to form a coating film 15. When the coating film 15 is uncured, the plate-like magnet 13 is directly above the coating film 15. Is horizontally arranged with the pattern 17 on the bottom, the magnetic powder 14 dispersed in the paint 15a is oriented in the direction in which the magnetic lines of force 21 extend based on the magnetic field generated by the plate magnet 13 as shown in FIG. Is done. That is, in the coating film 15 corresponding to most of the surface 13 a other than the outer peripheral edge 13 c and the pattern 17 of the plate magnet 13, the magnetic powder 14 is oriented so as to be substantially orthogonal to the surface of the coating film 15. In the coating film 15 corresponding to the outer peripheral edge 13 c of the plate-like magnet 13 and the picture pattern 17 of the coating film 15, the magnetic powder 14 is oriented substantially parallel to the surface of the coating film 15. Thereafter, the uncured coating film 15 in which the magnetic powder 14 is oriented is naturally dried or dried by heating to volatilize the solvent from the coating film 15, thereby curing the coating film 15. As a result, as shown in FIG. 7, a square annular pattern 22 is formed by the orientation of the magnetic powder 14 on the coating film 15 by the outer peripheral edge 13 c of the plate magnet 13, and the picture formed on the plate magnet 13. A pattern 17A having the same shape as the pattern 17 is formed by the orientation of the magnetic powder 14. The incident light from above the coating film 15 is most easily reflected by the magnetic powder 14 of the pattern 17A and the pattern 22 oriented so as to be orthogonal to the incident light in the coating film 15, and can be clearly and clearly visible. .

  As shown in FIG. 6, the magnetic powder 14 that is substantially parallel to the surface of the coating film 15 is present in the upper part of the coating film 15 because the plate-like magnet 13 is coated with the coating film as shown by the solid line in FIG. This is because the magnetic force lines 21 (magnetic field) that are close to the surface 15 and substantially parallel to the surface 13 a of the plate magnet 13 act on the coating film 15.

  Here, by using the plate-like magnet 13 in the present embodiment, the pattern 17A and the pattern 22 formed on the coating film 15 can exhibit a clear feeling, a deep feeling, and a moving feeling. The reason will be described with reference to FIG.

  As shown in FIG. 8, when viewed from above the coating film 15 with the eyes 23, the incident light 24 a is incident on the magnetic powder 14 in the coating film 15 that is oriented parallel to the surface of the coating film 15. Is reflected and the reflected light 24 b is directed straight up and enters the eye 23. Further, the magnetic powder 14 in the innermost part (lower part in FIG. 8) of the coating film 15 is oriented so as to cross obliquely with respect to the surface of the coating film 15, and the reflected light 24 b from the magnetic powder 14 enters the eye 23. Of the magnetic powder 14 in the coating film 15, even if the incident light 24 a strikes the magnetic powder 14 oriented so as to be substantially orthogonal to the surface of the coating film 15, the reflected light hardly enters the eyes 23. Therefore, the picture pattern 17A and the square annular pattern 22 can be clearly seen. When the eye 23 is moved to the right, the reflected light 24b from the different magnetic powder 14 enters the eye 23, so that the picture pattern 17A and the pattern 22 are moved (moved) to the right.

The effects exhibited by the above embodiment will be described collectively below.
(1) In the present embodiment, the pattern 17 is cut and formed as a square groove 17a and a round groove 17b on the surface 13a of the plate magnet 13 by a processing tool such as an end mill of a processing apparatus. Compared to the pattern forming apparatus to be used, the picture pattern 17 can be easily formed into an arbitrary shape, and the pattern 17A having an arbitrary shape can be easily formed on the coating film 15.

  (2) In the present embodiment, the square groove 17a and the round groove 17b as stepped portions are formed on the surface 13a of the plate-like magnet 13 by the processing tool. A fine arbitrary pattern can be easily formed, and a fine arbitrary shape pattern can be easily formed on the coating film 15.

  (3) In the present embodiment, since the magnet 13 is arranged along the surface on the surface side of the coating film 15, the inside of the coating film 15 is compared with the case where the magnet 13 is arranged on the back surface side of the workpiece 12. The influence of the magnetic field on the magnetic powder 14 can be increased, and an arbitrary finer pattern can be clearly formed. Further, the thickness of the coating film 15 can be increased.

(4) In this embodiment, the plate-shaped magnet 13 can be made into one sheet, a number of parts can be reduced, a structure can be simplified, and the cost of a pattern formation apparatus can be reduced.
(5) In this embodiment, since the step portion is formed in the magnetized plate-like magnet 13, a commercially available sheet-like rubber magnet can be used.

Next, another embodiment of the present invention will be described with reference to FIGS.
In this embodiment, as shown in FIG. 9, the plate-like magnet 13 is placed on the upper surface of the table 11 so that the surface 13a and the pattern 17 are on the top. Thereafter, the article 12 is placed on the surface 13 a of the plate magnet 13. Next, a coating film 15 is formed on the top surface of the object 12 by applying a coating material 15a. When the coating film 15 is in an uncured state, a magnetic field of the plate magnet 13 is applied to the magnetic powder 14 in the coating material 15a to orient the magnetic powder 14 by magnetic lines of force, and a pattern corresponding to the pattern 17 is applied to the coating film 15. To form. Thereafter, the uncured coating film 15 in which the magnetic powder 14 is oriented is naturally dried or dried by heating to volatilize the solvent from the coating film 15, thereby curing the coating film 15. In this embodiment, after the coating film 15 is formed on the top surface of the coating object 12, the coating object 12 may be placed on the surface 13 a of the plate magnet 13.

  In the above embodiment, the object 12 is supported on the surface 13a of the magnet 13, and the coating film 15 is formed on the surface of the object 12, so that the distance between the surface 13a of the magnet 13 and the coating film 15 is set. It can be set easily and uniformly, and the efficiency of the pattern forming operation can be improved. Further, the distance between the surface 13a of the magnet 13 and the coating film 15 can be made closer by thinning the thickness dimension of the article 12 to be coated as shown in FIG. It can also be formed clearly.

The present invention may be embodied as follows.
Although not shown in the drawing, various concave portions such as V-grooves or ridges may be formed instead of the square grooves 17a and the round grooves 17b that form the pattern 17 of the plate-like magnet 13 or the like. You may make it form the pattern 17 using the level | step-difference part which consists of a convex part. Even in the case of the protrusions and protrusions, magnetic lines of force parallel to the surface of the magnet are present in the vicinity thereof, so that the magnetic powder 14 in the coating film 15 can be oriented substantially parallel to the surface of the coating film 15. it can.

A magnet with the surface 13a side of the plate magnet 13 magnetized as the S pole and the back surface 13b side magnetized as the N pole may be used.
-As plate magnets 13, cast magnets (alnico magnets or iron / chromium / cobalt magnets), plastic working magnets (iron-manganese semi-hard magnets or iron-chromium-cobalt permanent magnets), ferrite magnets (barium-based magnets) Any one of strontium-based), rare-earth magnet (samarium-cobalt-based or neodymium-iron-boron-based), and special magnet (manganese / aluminum / carbon magnet or praseodymium / platinum magnet) may be used. An electromagnet may be used.

Sectional drawing which shows the pattern formation apparatus which has arrange | positioned the plate-shaped magnet so that a coating film may be formed in the surface of a to-be-coated object, and it may adjoin to the surface of a coating film. The perspective view of a plate-shaped magnet. Explanatory drawing which shows the direction of the magnetic force line of a plate-shaped magnet. Explanatory drawing which shows the direction of the magnetic force line near the square groove of a plate-shaped magnet. Explanatory drawing which shows the direction of the magnetic force line near the round groove of a plate-shaped magnet. Explanatory drawing which shows a part of coating film in which the pattern which the coating film hardened was formed. The front view of the coating film in which the pattern was formed. Explanatory drawing which shows reflection of the light of the magnetic powder in a coating film. Sectional drawing of the pattern formation apparatus which shows another embodiment of this invention. Explanatory drawing which shows the state in which the coating film of FIG. 9 hardened | cured and the pattern was formed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 12 ... Coating object, 13 ... Magnet, 13a ... Surface, 14 ... Magnetic powder, 15a ... Paint, 15 ... Paint, 17 ... Picture pattern, 17a ... Square groove as a step part, 17b ... Round groove as a step part , 21 ... lines of magnetic force, 22 ... pattern.

Claims (4)

After coating a coating containing flat magnetic powder on the surface of the object to be coated to form a coating film, a magnet having a surface of the same polarity along the surface is disposed on the surface side of the coating film, When the magnetic powder in the coating film is in a movable state, a magnetic field is applied to the coating film by the magnet, and the magnetic powder is generated by lines of magnetic force substantially parallel to the surface formed on the step formed on the surface of the magnet. A pattern forming method comprising: forming a pattern with the magnetic powder in the coating film by drying and curing the coating film in a state in which the film is oriented. An object to be coated is disposed on the surface of the magnet having the same polarity surface, and a coating film is formed by applying a coating containing flat magnetic powder on the surface of the coating object. When the magnetic powder is in a movable state, a magnetic field is applied to the coating film by the magnet, and the magnetic powder is oriented by lines of magnetic force substantially parallel to the surface generated at the step formed on the surface of the magnet. A pattern forming method comprising: forming a pattern with the magnetic powder in the coating film by drying and curing the coating film in a state. In a pattern forming apparatus in which a magnetic field is applied to a coating film applied to the upper surface of an object by a magnet so that magnetic powder in the coating film is oriented by lines of magnetic force to form a pattern. A pattern forming apparatus characterized in that a step portion for generating a magnetic force line substantially parallel to the surface is formed. 4. The pattern forming apparatus according to claim 3, wherein the step portion of the magnet is formed by a concave portion or a convex portion.

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