JP2001134167A - Molding with hologram and its producing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a rugged pattern of hologram in a projecting region or a recessed region of one part of the surface of a molding having an arbitrary three-dimensional shape without generating a problem in the drawing-out of the molding and a die. SOLUTION: An opening 1a is formed in a direction vertical to the die surface in the hologram forming region of a main body 1 of the die, a stamper member 2 on the tip surface of which the rugged pattern of hologram is formed is disposed in such a manner that the tip surface protrudes from the die surface on the opening 1a, the molding 23 is formed by injection molding in a molding space which is formed with the die surface of the main body 1 of the die and the tip surface of the stamper member 2, the tip surface of the stamper member 2 is retreated from the die surface of the main body 1 of the die and the molding 23 is drawn out in a direction parallel to the surface of the molding 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded product with a hologram having a hologram formed on the surface and a method for producing the molded product.

[0002]

2. Description of the Related Art As a conventional method of manufacturing a resin molded product having a hologram, for example, Japanese Patent No. 254551 proposes a method of forming a concave and convex pattern of a hologram on a flat surface of a flat molded product. Have been. In this manufacturing method, a flat hologram master plate having an uneven pattern of holograms formed on a flat surface is made of a curable resin, and the hologram master plate is provided in a mold, injection-molded, and molded. Pull out the hologram master plate in the uneven direction. In addition, as another method, the column of the conventional example in the publication discloses (1) forming a photosensitive resin layer on the surface of a resin molded product, and exposing the photosensitive resin layer with a laser beam to directly form a hologram. (2) a method of embossing the surface of a resin molded product using a flat or cylindrical master plate having a hologram uneven shape, and (3) a hologram using a hologram transfer sheet on the surface of the resin molded product. And the like, and a method of thermally transferring the concave and convex shape.

[0003]

However, the above-mentioned conventional manufacturing method is a method of forming a hologram uneven pattern on a flat surface of a flat molded product.
For example, the surface of a molded product of a three-dimensional shape that is swollen or depressed, such as a cosmetic bottle or the housing of an electric appliance, is projected, or a part of the surface of a molded product is depressed. The problem of removing the molded product and the mold occurs when trying to form.

The present invention has been made in view of the above-mentioned problems of the prior art, and does not cause a problem of removing a molded product and a mold. An object of the present invention is to provide a molded product with a hologram capable of forming a concave and convex pattern of a hologram and a method of manufacturing the same.

[0005]

According to the present invention, in order to achieve the above object, a hologram uneven pattern is formed in a partially recessed area of the surface of a three-dimensional molded product. The end face of the formed stamper member is retracted from the mold surface of the mold body to remove a molded product.

That is, according to the present invention, there is provided a method of manufacturing a molded product with a hologram, wherein a concave / convex pattern of a hologram is formed in a partial region of the surface of a molded product having an arbitrary three-dimensional shape. Forming an opening in a direction perpendicular to the mold surface in the region, arranging a stamper member having a hologram uneven pattern formed on the tip end surface in the opening, and a mold surface of the mold body and the stamper. Forming a molded product in a molding space formed by the tip surface of the member, and retracting the tip surface of the stamper member from the mold surface of the mold body to move the molded product in a direction parallel to the mold surface. A method of manufacturing a molded article with a hologram, comprising the steps of: Further, in order to achieve the above object, the present invention can move the mold body in a direction orthogonal to the mold surface in order to form a hologram uneven pattern on a part of the surface of the three-dimensional molded product. In this way, the molded product is divided into a plurality of mold members and a molded product is extracted.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a mold body used in a first embodiment of a molded product with a hologram and a method of manufacturing the same according to the present invention. FIG. 2 is a cutaway perspective view showing the mold body of FIG. 3 is an explanatory view showing a process of assembling the engraved block on the mold body of FIGS. 1 and 2, FIG. 4 is an explanatory view showing a manufacturing process of the CGH stamper of FIG. 3, and FIG. 5 is a manufacturing process of a molded product with a hologram. FIG.

FIGS. 1 and 2 show a mold body (also referred to as a resin molding mold) in which a hologram uneven pattern is formed in a circular area in which a part of a circular area on a side surface of a cylindrical molded product is recessed.
1 is shown. In the direction perpendicular to the mold surface of the mold body 1 (hologram unevenness direction), the cylindrical marking block 2 serving as a hologram mold is moved in a direction perpendicular to the mold surface as shown in FIG. A cylindrical opening 1a is formed for possible positioning.

As shown in FIG. 3A, the engraving block 2 directly draws, for example, a concave / convex pattern of a hologram representing a company logo, a mark, product data, etc. on the end surface of a cylindrical engraving block main body 2a. Coin-shaped CGH stamper 2b having a hologram uneven pattern formed on the surface
Is joined to the end face of the cylindrical marking block main body 2a. The engraved block main body 2a is made of an iron-based metal, and the CGH stamper 2b is made of nickel. When the engraved block main body 2a and the CGH stamper 2b are joined, they are performed by metal brazing, glass sealing, plasma joining, or the like. Such plural types of stamp blocks 2
Is also referred to as a stamper member 2. Then, FIG.
By inserting the engraving block 2 into the opening 1a of the mold body 1 as shown in (d), the hologram surface at least partially protrudes from the surface of the mold body 1 or the entire mold having the same surface is formed. create.

The manufacturing process of the CGH stamper 2b will be described with reference to FIG. First, as shown in FIG. 4A, a photoresist 12 is applied on a substrate 11 such as glass or a silicon master placed on an xy stage (not shown), and then as shown in FIG. A latent image of a concavo-convex pattern is formed on the photoresist 12 by electron beam drawing exposure or mask exposure.
Formed.

Next, as shown in FIG. 4C, the latent image of the concavo-convex pattern is developed, followed by etching as shown in FIG. 4D, and then removing the resist 12 as shown in FIG. By doing so, a concavo-convex pattern is formed on the substrate 11. Next, a conductive film 13 is formed on the substrate 11 as shown in FIG. 4 (f) and then electroformed with nickel as shown in FIG. 4 (g). The CGH stamper 2b made of nickel to which the concave / convex pattern is transferred is formed.

This concavo-convex pattern is described in, for example,
It is known as CGH (Computer Generated Hologram) computed by a computer as shown in 171334 and the like, and the pitch of the uneven pattern is about 1 μm and the depth is about 0.1 to 1 μm. Then, when this concavo-convex pattern is transferred to a transparent molded product and irradiated with monochromatic light having a wavelength corresponding to the depth, CGH can be reproduced by transmitted diffracted light or reflected diffracted light.
In the case of a reflective CGH, the molded product may not be transparent if a reflective film is provided.

Next, with reference to FIG. 5, a process of manufacturing a molded product with a hologram will be described. First, as shown in FIG. 5A, the mold main body 1 on which the engraving block 2 is mounted is mounted on the molding machine 20. At this time, the molding space of the mold body 1 and the resin nozzle 21 are positioned, and the engraving block 2 is supported by the air cylinder 22 so as to protrude from the mold surface of the mold body 1. Next, as shown in FIG.
After the molding space of the mold 1 is closed,
The resin 21a is injected into the molding space.

Next, as shown in FIG. 5C, after the injected resin 21a cools and a cylindrical molded product 23 is formed in the molding space, the engraved block 2 is formed by the air cylinder 22.
Is retracted outside, that is, in the hologram uneven direction.
Next, as shown in FIG. 5D, after the molding space of the mold body 1 is opened, the cylindrical molded product 23 is taken out in parallel with the mold surface, that is, in the axial direction of the cylindrical molded product 23. Thereby, CGH is formed in a circular region in which a part of the side surface of the cylindrical molded product 23 is concave. Note that the shape of the molded product 23 is not limited to a cylindrical shape, but can be applied to any shape such as a polygonal pillar or a sphere.

<Second Embodiment> In this second embodiment, a mold body is provided with a mold surface in order to form a concave / convex pattern of a hologram in a part of the surface of a three-dimensional molded product projecting from the surface. For example, FIG.
As shown in the figure, the marking block 2 is arranged in at least one of the openings 1a so that the tip surface is depressed from the mold surface. If the engraved block 2 is attached to each member to form a cylindrical molded product 23, three CGHs 24 can be produced in the circumferential direction of the molded product 23 as shown in FIG. Instead of dividing the mold body 1 into three parts, the mold body 1 may be divided into twelve parts in the circumferential direction as shown in FIG.

If the mold body 1 is divided in this way, it is not necessary to retract the engraved block 2 from the mold surface before removing the molded product 23 from the mold in the manufacturing process of the first embodiment. The molded product 23 can be removed by opening the split mold outward with the marking block 2 fixed. In this case, as shown in FIG. 9, a female screw 31 penetrating the side surface of the engraving block 2 is formed, and a screw hole 32 penetrating to the opening 1a is formed in the divided mold 1 so that the engraved block 2 is divided. 1 or a screw on the side surface of the engraving block 2 and the inner surface of the split mold 1 as shown in FIG.

When the molded product 23 and the CGH stamper 2b are pulled out in the concave-convex direction, considering the prevention of breakage of the concave-convex pattern formed on the molded product 23, the tip of the convex portion formed on the CGH stamper 2b has a right angle. Instead, as shown in FIG. 11, it is desirable to form it so as to be thin at an angle of about 15 °, for example. In this case, as shown in FIG. 12, two or more engraving blocks 2 can be attached to one split mold, so that the versatility of the arrangement position of the CGH with respect to the molded product 23 can be improved.

The shape of the CGH formed on the molded article 23 is not limited to a circle or a plane. For example, as shown in FIG. 13, the CGH stamper 2b (and the engraved block body 2)
The cross section of a) can be formed in a square, and the CG
The surface of the H stamper 2b can be formed not as a plane but as a curved surface corresponding to the bulge of the surface of the molded product 23.

FIG. 14 shows a manufacturing process according to the second embodiment. First, as shown in FIG. 14A, the mold body 1 on which the engraving block 2 is mounted is mounted on a molding machine 20.
At this time, the molding space of the mold body 1 and the resin nozzle 21 are positioned, and, for example, the mold member 1-1 on which the marking block 2 is mounted and the mold member 1-2 on which the marking block 2 is not mounted, respectively. Air cylinders 22-1, 22-2
Supported by

Next, as shown in FIG. 14B, after the molding space of the mold body 1 is closed, the resin 21a is injected from the resin nozzle 21 into the molding space of the mold body 1. Next, FIG.
As shown in (c) and (d), after the injected resin 21a cools and a cylindrical molded product 23 is formed in the molding space,
The mold member 1 is formed by the air cylinders 22-1 and 22-2.
1, 1-2 are opened in the hologram uneven direction, and a cylindrical molded product 23 is taken out.

Here, since it is difficult to read the CGH 24 formed on the surface of the molded article 23 having an arbitrary three-dimensional shape by the transmission type, as shown in FIG. By forming the reflective film 25 and forming the protective film 26 on the reflective film 25, reading can be performed by a reflection type. FIG. 15 shows a line A shown in FIG.
FIG. 3 shows a cross-sectional view of a main part along A.

As the resin 21a constituting the molded product 23, vinyl chloride resin, polyolefin resin such as polystyrene, polyethylene, acetylcellulose, methacrylic resin, polycarbonate resin, polyester resin, polyamide resin, etc. Can be.
As the reflection film 25, Cr, Ti, Fe, Co, Ni,
Cu, Ag, Au, Ge, Al, Mg, Sb, Pb, P
Metals such as d, Cd, Bi, Sn, Se, In, Ga, and Rb and their oxides, nitrides, and the like can be used alone or in combination of two or more, but Al, Ag,
Au or the like is particularly desirable. The film thickness is desirably 70 to 100 nm in order not to impair the unevenness of the CGH, and a vacuum deposition method, a sputtering method, or an ion plating method can be used as a film formation method. It is important that the protective layer 26 be formed so that the diffraction image of the CGH 24 is readable so as not to hinder the reflectivity of the reflective film 25, and it is necessary to form a film with a transparent synthetic resin paint or laminate a transparent film. Can be formed.

Therefore, according to the present invention, in addition to the inventions described in the claims, the following inventions are provided. (1) A method for manufacturing a molded product with a hologram in which an uneven pattern of a hologram is formed on a part of a protruding region of a surface of a molded product having an arbitrary three-dimensional shape, wherein a mold body is oriented in a direction orthogonal to a mold surface. The mold is divided into a plurality of mold members so as to be movable, and an opening is formed in a direction orthogonal to a mold surface in at least one of the hologram forming regions of the plurality of mold members. The formed stamper member is arranged so that the leading end surface is depressed from the mold surface at the opening, and injection molding is performed in a molding space formed by the mold surfaces of the plurality of mold members and the leading end surface of the stamper member. With a hologram, a molded product is formed, and at least one of the plurality of mold members is retracted from a hologram forming area of the molded product, and the molded product is removed in a direction parallel to a mold surface. Method of manufacturing the mold goods. According to the present invention, the mold body is divided into a plurality of mold members so that the mold body can be moved in a direction perpendicular to the mold surface and the molded product is extracted. The uneven pattern of the hologram can be formed on a part of the surface of the molded article having an arbitrary three-dimensional shape without the occurrence of the hologram. Further, the stamper member may be arranged so that at least a part thereof protrudes from the mold surface or is flush with the mold surface. (2) In the method for manufacturing a molded product with a hologram according to claim 1 or (1), a thin reflective film is formed on the hologram region on the surface of the molded product so as not to impair the thickness of the concave and convex pattern of the hologram. And forming a protective film on the reflective film. (3) The method for producing a molded product with a hologram according to any one of (1) and (1) and (2), wherein the hologram is created by a computer. Manufacturing method. (4) The method for producing a molded product with a hologram according to any one of (1) to (3), wherein the tip end surface of the stamper member is a flat surface. Product manufacturing method. (5) In the method for manufacturing a molded product with a hologram according to any one of (1) to (3), the tip surface of the stamper member has a curved surface corresponding to a bulge of the surface of the molded product. A method for producing a molded product with a hologram, comprising: (6) In the method of manufacturing a molded product with a hologram according to any one of (1) to (5), the stamper member includes a flat stamper on which a hologram is formed and a main body. A method for producing a molded article with a hologram, wherein the molded article is formed by bonding. (7) The method for manufacturing a molded product with a hologram according to any one of (1) to (5), wherein a hologram is directly formed on a tip end surface of the stamper member. Method for manufacturing a molded product with a hologram.

[0024]

As described above, according to the present invention, the molded product is removed by retracting the tip end surface of the stamper member having the hologram uneven pattern from the mold surface of the mold body. The concave and convex pattern of the hologram can be formed in a part of the surface of the molded article having an arbitrary three-dimensional shape, without the problem of removing the molded article and the mold.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a mold body used in a first embodiment of a molded product with a hologram and a method of manufacturing the same according to the present invention.

FIG. 2 is a cutaway perspective view of the mold body of FIG. 1;

FIG. 3 is an explanatory view showing a process of assembling an engraved block on the mold body of FIGS. 1 and 2;

FIG. 4 is an explanatory view showing a manufacturing process of the CGH stamper of FIG. 3;

FIG. 5 is an explanatory view showing a manufacturing process of a molded product with a hologram.

FIG. 6 is a perspective view showing a mold according to a second embodiment.

FIG. 7 is a perspective view showing a molded product manufactured by the mold of FIG. 8;

FIG. 8 is a perspective view showing a mold according to a modification of the second embodiment.

FIG. 9 is a perspective view showing a modified example of the engraved block in the second embodiment.

FIG. 10 is a perspective view showing another modification of the engraved block in the second embodiment.

FIG. 11 is a cross-sectional view showing a tip shape of a hologram uneven pattern.

FIG. 12 is a perspective view showing still another modified example of the mold according to the second embodiment.

FIG. 13 is a perspective view showing a modification of the CGH stamper.

FIG. 14 is an explanatory diagram illustrating a manufacturing process of a molded product with a hologram according to the second embodiment.

FIG. 15 is a sectional view showing a hologram part of a molded product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Die main body 1a Opening 2 Marking block (stamper member) 2b CGH stamper 23 Molded product 24 CGH (hologram) 25 Reflective film 26 Protective film

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H049 CA06 CA22 CA28 2K008 AA00 FF12 FF13 FF14 FF27 GG05 4F202 AA03 AA15 CA11 CB01 CK28 CK52

Claims (2)

[Claims] 1. A method for manufacturing a molded product with a hologram, wherein a concave / convex pattern of a hologram is formed in a partial region of the surface of a molded product having an arbitrary three-dimensional shape, wherein a mold surface is formed in the hologram forming region of a mold body. Forming an opening in a direction perpendicular to the direction of: a step of arranging a stamper member having a hologram uneven pattern formed on a front end surface in the opening; and a die surface of the die body and a front end surface of the stamper member. Forming a molded product in the formed molding space, and retracting the tip surface of the stamper member from the mold surface of the mold main body, and removing the molded product in a direction parallel to the mold surface, Of manufacturing a molded product with a hologram having the same. 2. A molded product with a hologram having a hologram uneven pattern formed on an arbitrary three-dimensional surface by using the manufacturing method according to claim 1.