JPH07156266A - Multiple imprinting method of relief pattern - Google Patents

Abstract

(57) [Abstract] [Purpose] When multiple fine relief patterns such as holograms, diffraction gratings, and new opal embosses are embossed on the same plane (multi-faced), the design quality is reduced due to the multi-faceted surfaces. Get a multi-faceted stamper that you won't see. [Structure] A metal stamper, on which a relief pattern is formed, which is a basis for multiple imposition, is cut into a predetermined shape by etching, and a plurality of sheets are joined together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of embossing a fine relief pattern such as a hologram, a diffraction grating, and a new opal emboss, and particularly, forming a plurality of relief patterns on the same plane (hereinafter referred to as a book). In the specification, the method is referred to as "multiple imposition".

[0002] For a packaging material such as a wrapping paper or carton, or a building material such as a decorative plate or a wallpaper for a special purpose, a relief pattern-formed large area sheet can be obtained by attaching relief patterns to multiple surfaces. Is requested.

[0003]

2. Description of the Related Art In the case of a relief hologram, interference fringes are recorded in a concavo-convex shape on a photosensitive resin by a known method such as two-beam interference with a laser beam, and a reverse type of the concavo-convex pattern is recorded.
A stamper can be obtained by making full use of methods such as vapor deposition and plating.

At this time, there is a limit to increase the area of the pattern made up of the interference fringes that are the masters, and a large number of resin is used after the stampers are arranged on the same plane to form multiple stampers. Proposals for embossing duplication on the sheet surface have been made in the past.

An electroforming method is well known as a method for obtaining a stamper, and the obtained metal stamper is used as a multi-faced stamper by the procedure described below.

As many stampers as the number of sheets to be impositioned are prepared. The peripheral portion of each stamper is cut into a predetermined shape using a cutter or the like. Place stampers side by side on a flat surface and fix them closely.

[0007]

In the cutting process of [Problem to be solved by the invention], mechanical cutting (paper cutter or stepping cutter) is used, but the upper surface of the stamper is drawn into the blade of the cutter when pushed by the cutter. It had the above defects. Therefore, even if it is attempted to cut into a predetermined shape, it is difficult for the end of the cutting portion to have the desired shape, and the dimensional accuracy is poor.

Further, there are problems that burrs generated by cutting come out from the lower surface of the stamper and that the cut surface is not always perpendicular to the stamper surface. It had an adverse effect.

When the multi-faced stamper is used in the above-mentioned state and the relief pattern is embossed and duplicated on the resin sheet, the seam between the stampers becomes conspicuous, and the design is significantly impaired. If it was in the protruding state, the resin sheet could be damaged by burrs.

In order to avoid the above-mentioned adverse effects, post-processing such as grinding and polishing is required for the stamper after cutting.
The work efficiency was poor.

An object of the present invention is to improve the above-mentioned steps to obtain a multi-faced stamper which does not impair the design even when multi-faced.

[0012]

The present invention achieves the above-mentioned object by cutting a metal stamper having a relief pattern formed on its surface, which is a basis for multi-sided attachment, into a predetermined shape by etching.

The concept of the cutting step is that, as shown in FIG. 1, a resist film is formed on the surface of the stamper in a shape that is not removed by etching, and the non-resist portion is removed by a known etching method. .

Cutting shape by etching (in other words,
The resist pattern) can be appropriately changed, and as shown in various multi-faced stampers (example of four surfaces) of FIG. 2, the cutting portion can be not only a straight line but also a curved line.

[0015]

In comparison with mechanical cutting, burrs do not occur at the cutting portion of the stamper, and a sharply cut cutting portion can be obtained. In addition, the dimensional accuracy is improved, and the workability at the time of close contact / fixing in the next process is also improved.

The above-mentioned matters are in anisotropic etching in which etching proceeds only in the thickness direction of the metal plate.
It will become more prominent.

Further, since the resist pattern can be arbitrarily changed, the cutting shape can be freely changed.

According to the above matters, the cutting shape can be changed according to the pattern applied as the relief pattern,
When multiple faces are attached, it is easier to devise a device to make the joints less noticeable.

[0019]

[Example] As the material of the stamper 1, nickel, copper,
In addition, alloys of these with other metals are common, and the etching suitability is also good.

A resist pattern 2 having a predetermined shape is formed on the surface of the stamper 1 obtained by electroforming by photolithography, and then etching is performed to dissolve and remove the stamper 1 in a region where the resist pattern 2 is not formed. To do. (Fig. 1 (a) (b))

Next, the stamper 1 cut into a predetermined shape
^The resist pattern 2 remaining on the surface of the'is dissolved and removed.
(Fig. 1 (c))

The obtained stamper 1 ^', high dimensional accuracy, and sheer is cut surface, when brought into close contact side by side a plurality, hardly a gap.

The above stampers 1 ^′ are prepared for the number of sheets to be impositioned, and they are brought into close contact with and fixed on a flat surface to form a stamper for multiple imposition. In some cases, from the multi-sided stamper,
Further, the reverse type may be obtained by making full use of a method such as vapor deposition / plating to obtain a multi-sided stamper (referred to as a practical version for the original version) used for actual emboss duplication.

[0024]

As described above, according to the cutting of the stamper by etching, the cut surface rises vertically. Therefore, when a plurality of sheets are aligned and closely fixed, a gap is unlikely to occur between the stampers, and the multi-sided mounting is possible. When embossed as a stamper, the seams between the stampers are not conspicuous on the surface of the duplicate, so the design of the product is not impaired.

[0025]

[Brief description of drawings]

FIG. 1 is an explanatory view showing a step of cutting a stamper by etching.

FIG. 2 is an explanatory view showing a multi-sided stamper in which the cutting shape is appropriately changed.

[Explanation of symbols]

 1 ... Stamper 2 ... Resist pattern

Claims (1)

[Claims] 1. A method for duplicating a relief pattern by imprinting a plurality of relief patterns on the same plane to perform a multi-imposition, comprising at least the following steps. (A) A step of cutting a metal stamper having a relief pattern formed on its surface, which is a basis for multi-sided attachment, into a predetermined shape by etching. (B) A step of arranging the stampers obtained in the step (a) on the same plane by the number of sheets to be impositioned and closely adhering to each other so that no gap is formed between the adjacent stampers. (C) A step of embossing duplication on the surface of the thermoplastic resin sheet by using the plurality of stampers that are brought into close contact with each other and fixed in step (b) as one multi-sided stamper.