JPH0754166A - Method of manufacturing shaping die for decorative board - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a method for manufacturing a shaping mold for a decorative sheet, which has a letterpress portion that almost exactly corresponds to a natural conduit consisting of a deep portion and a shallow portion. [Structure] This manufacturing method includes an exposure step and an etching step. In the exposure step, the first mask film 2 and the second mask film 6 are used in an overlapping manner. If these two films 2 and 6 are overlapped, the conduit shadow part as a whole will be the conduit shadow part 2a.
The resulting concentration is raised. When the photocurable layer is exposed through these mask films 2 and 6 that are overlapped, the exposure is performed corresponding to the shaded conduit shade. By corroding the substrate through the first etching step and the second etching step using the photo-cured layer thus produced, a conduit-corresponding convex portion having a profile exactly corresponding to a natural conduit was provided. A shaped mold is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a shaping mold for a decorative board and a mask film used in the method,
Specifically, a pattern of a wood grain or a ground pattern of a stone material is artificially shaped, and a manufacturing method of a shaping mold used in the step of pressing a decorative plate made of a material such as paper or synthetic resin, and The present invention relates to a mask film used in an exposure step in a method.

[0002]

2. Description of the Related Art Conventionally, for example, in the case of a decorative board having a wood grain pattern, the pattern of conduits forming the wood grain, that is, a number of concave line patterns is generally formed. Therefore, an infinite number of concave line patterns corresponding to the wood grain (conduit) is formed on the shaping die for forming such a decorative board. Conventionally,
As a method for forming such a shaped mold, a natural wood grain (conduit 1) shown in FIG. 1 is photographed on a photographic film, and the photographic film is used as an original plate to form a photosensitive resin on a substrate. A method is known in which the film is baked and then a portion corresponding to the conduit is formed as a convex portion by using a chemical etching method.

In the conventional manufacturing method, an uneven pattern is thus formed corresponding to the desired pattern of wood grain or the like. However, depending on the conventional method, a decorative plate having gradation such as photographic gradation is provided. It was not possible to realize a shaped mold for making.

As for the shaping mold for producing such a decorative board having gradation such as photographic gradation, the best solution is to shape the decorative board with an uneven pattern which is almost the same as a natural conduit. Needless to say. That is, the conduit of natural wood has a shallow portion and a deep portion as shown in FIGS. 2 and 3, and it is necessary to form a convex shape corresponding to such a shape into a shaping die. .

Referring to FIGS. 2 and 3, FIG. 2 shows a natural wood, and innumerable triangular conduits 1 schematically shown on the surface of the wood. In the figure, AB and CD indicate that cutting is performed on a plane including each line segment. This cross-sectional state is shown in FIG. The conduit acts as a passage for water in the tree and is a long pipe.
The cut end of the conduit appears on the surface of the cut wood as shown in FIG. In FIG. 3 (I), the cutting line A
In -B, it is clear that the conduit 1 is cut obliquely. Further, as shown in (II) and (III), in the section C-D, a state in which the upper part or the upper half of the conduit 1 is cut is shown. in this way,
Since the conduit itself is essentially pipe-shaped, the cut portion of the conduit appearing on the surface of the wood is formed by the peripheral shallow portion 1a and the central deep portion 1b. And the depth change is gradually changing.

The gradation corresponding to the depth of the conduit cannot be obtained in the photographic film as the original plate used in the conventional shaping manufacturing method, and the entire conduit is photographed as a shaded area on the film. Because of this (in the case of a positive film), the shaped mold produced using the mask film did not necessarily correspond exactly to the shape of the natural wood conduit.

[0007]

SUMMARY OF THE INVENTION Therefore, the technical problem to be solved by the present invention is to provide a method of manufacturing a shaping mold capable of manufacturing a decorative plate having gradation such as photographic gradation, that is, a deep portion and a shallow portion. It is an object of the present invention to provide a method of manufacturing a shaping mold having a letterpress portion that corresponds almost exactly to a natural conduit formed by the parts.

[0008]

Means, Actions and Effects for Solving the Problems A manufacturing method according to the present invention for solving the above technical problems will be described in detail below with reference to FIGS.

4 to 12 illustrate the basics of the method of manufacturing a shaping die for a decorative plate according to the present invention. In this manufacturing method, a mask film (first
The mask film 2 is used (the second mask film 6 is also used in the present manufacturing method, which will be described later). First, the mask film 2 will be described with reference to FIG.

The mask film 2 has a conduit shadow portion 2a whose density changes from dark to light corresponding to a shallow portion to a deep portion of the natural conduit 1, and a ground portion 2c other than the conduit shadow portion 2a. Is almost transparent. In FIG. 4, reference numeral 2b indicates the light and shade distribution of the conduit shadow portion 2a. That is, the concentration of the portion (1a) corresponding to the peripheral shallow portion 1a of the natural conduit 1 is high, while the central portion (1b) corresponding to the deep portion 1b of the natural conduit 1 is thin.

FIG. 5 shows an example of a method of manufacturing the first mask film. In this example, the first film 10, the second film 11 and the third film 14 are used. Here, the plate-making photographic film refers to a lith film, a color separation film, a process film and the like. The first film 10 has a conduit shadow portion 10a corresponding to the natural conduit 1 on its upper surface, and a ground portion 10c other than the conduit shadow portion 10a is formed substantially transparent. The second film 11 has a transparent conduit portion 11a corresponding to the natural conduit 1, and the bottom surface of the ground portion 11c other than the transparent conduit portion 11a is formed as a shaded portion. The third film 14 is an unused one, and the third film 14 becomes the mask film 2 after exposure and development. In FIG. 5 (I), the conduit shadow portion 10a of each film 10 and 11 and the base portion 11c as the shadow portion are formed by the photosensitive layer formed on the upper surface or the lower surface of the film.

As shown in the figure, the three films 10, 11 and 14 have their photosensitive layers back-to-back between the films 10-11 and the photosensitive layers facing each other between the films 11-14. Film 10 from top to bottom
The film 11 and the base film are back-to-back and are exposed to light L in a state of being in close contact with each other. At this time,
The conduit shadow portions 10a and the conduit transparent portions 11a are arranged at positions corresponding to each other. In the embodiment shown in FIG. 5, this arrangement is such that the shape and size of the conduit shadow portion 10a are substantially the same as the shape and size of the conduit transparent portion 11a.
The respective conduit shadow portions 10a and the respective conduit transparent portions 11a are substantially aligned vertically.

As shown in FIG. 5, when the contact films 10, 11, and 14 are exposed to light L, due to the diffraction phenomenon of light,
As shown in (II), the third film 14 (mask film 2) is provided with a conduit shadow portion 2a having a density distribution in which the density of the peripheral portion is high and the density of the central portion is low. That is, since the films 10 and 11 each have a constant thickness dimension, for example, a thickness dimension of 100 μ to 175 μ, the film 10 and 11 have a thickness of 200 μ to 3 μ between the shaded portions.
An interval of 50μ is formed. Therefore, from the periphery of the conduit shadow portion 10a of the first film 10, each film 10,1
The light incident on the beam No. 1 causes a diffraction phenomenon, and the shaded area 10a
The light will wrap around in the lower center direction. That is,
If there is no light diffraction phenomenon, that is, if the light L incident from above travels straight downward, the width dimension of the conduit shadow portion 10a and the width dimension of the conduit transparent portion 11a are the same,
The light incident on the third film 14 using the transparent conduit portion 11a as a light passage window is theoretically zero, and the third film 14 is not exposed. However, in the present invention, by utilizing this diffraction phenomenon of light, a certain amount of light is transmitted through the conduit transparent portion 11a.
Can be incident on the third film 14 as a light passage window. Then, this incident light passes through the third film 14
However, the exposure amount is large in the peripheral portion and small in the central portion, and gradually decreases in a quadratic curve from the periphery of the conduit shadow portion 2a toward the center as shown in the density distribution curve 2b. . Therefore, when the third film 14 exposed in this way is developed, the density of the portion having a large exposure amount becomes high and the density of the portion having a small exposure amount becomes low. That is, the concentration of the shaded portion 2a of the conduit is 1
The depth changes from dark to light corresponding to the deep part. In this way, the intended mask film 2 shown in FIG. 4 can be obtained.

In FIG. 5, the cross-sectional directions of the conduit shadow portion 10a and the conduit transparent portion 11a are not particularly limited. That is, it is applied to both the transverse direction and the longitudinal direction of the natural conduit 1. That is, according to the embodiment shown in FIG. 5, the concentration distribution of the conduit shadow portion 2a in both the transverse direction and the longitudinal direction of the natural conduit 1 is as shown in FIG.
As shown in I). Therefore, this concentration distribution corresponds well to the transverse shape of the natural conduit 1 shown in FIGS. 3 (II, III), but the longitudinal cross-sectional shape of the natural conduit 1 shown in FIG. 3 (I). There is a hate that doesn't correspond exactly.

The above-mentioned first and second films 10, 11
As such, it can be manufactured by the photographic technique shown in FIG. 6 as an example. FIG. 6 shows a state where the camera 12 photographs the surface of natural wood having a large number of conduits 1 having a wood pattern. This shooting method is publicly known,
This is a photographing method for emphasizing the contrast between the black portion of the wood pattern, that is, the conduit, which is the subject, and the other relatively bright background portion. Therefore, this camera 1
The film used in 2 is a lith film that meets the purpose. And again, at the time of shooting,
Light L is projected obliquely to the surface of natural wood,
The portion of each conduit 1 that is recessed with respect to the surface of the natural wood is darkened, while the background portion is brightened, that is, the light and dark are emphasized for photographing. As a result, the second film 11 having the base portion 11c having the uniform or uniform density on the entire surface can be obtained. In this case, the first film 1
0 is a negative film for the second film 11. That is, although not shown in the drawing, the unused first negative film (1
By exposing 0) so that the photosensitive layer is in close contact, the first film 10 in which the shaded portions are reversed from the second film 11 can be obtained.

Further, as a method of further enhancing the contrast, a method in which the surface of the natural wood other than the conduit portion is painted white, and vice versa (when the natural wood has a dark color),
There is a method in which only the conduit portion is filled with white chalk to make it white, and then the image is taken.

In the method of the present invention, the first method detailed above is used.
Although the second mask film 6 is used in addition to the mask film 2, for the sake of convenience of description, first, the principle of the case where only the first mask film 2 is used and the problem thereof will be described. First, an exposure process using the mask film 2 is performed. This exposure process is shown in FIG. As shown in FIG. 7, the light curing layer 3a is exposed to the light L through the mask film 2 to sufficiently photo-cure the portion corresponding to the ground portion 2c to form the peripheral curing portion 3e, and the conduit shadow portion 2a. The portion corresponding to is photo-cured at the depth of the profile corresponding to the concentration to form the convex cured portion 3c surrounded by the peripheral cured portion 3e. The photo-cured portion is shown by the diagonal lines. In the illustrated embodiment, a carbon tissue 3 is used. The carbon tissue 3 itself is a known one and is formed of a photo-curing layer 3a and a base paper 3b. Light rays of the light L are indicated by arrows in FIG. 7. As is clear from this, since the base portion 2c of the mask film 2 is almost transparent, the light L penetrates deeply into the photo-curing layer 3a, while the light shielding layer 3a of the mask film 2 is The light L reaches an amount corresponding to the shade. That is, since the peripheral portion of the conduit shadow portion 2a is a dark shadow, the transmission depth of the light L is small, while the central portion of the conduit shadow portion 2a has a low density, so that the light reaches deeper than the peripheral portion. . Therefore, the convex hardened portion 3c has a cross-sectional shape corresponding to the natural conduit 1. In the figure, 3d indicates a portion where the light L does not reach, that is, an uncured portion.

Then, the photo-cured layer 3a of exposed carbon tissue is attached to a substrate 4, for example, a copper plate, and developed with warm water to remove the uncured portion 3d to remove the base paper 3b.
By peeling off, a photo-cured film for etching is formed on the surface of the substrate 4. This state is shown in FIG.

FIG. 9 shows the above-mentioned first etching step. In this step, the corrosive liquid Q is permeated from above the photocurable layer 3a. The permeation part of the corrosive liquid is shown by a dotted pattern.
As a result, the corrosive liquid Q permeates the substrate 4 to the depth of the profile corresponding to the thickness and shape of the photo-cured layer 3a to corrode the upper layer of the metal substrate 4 and remove the corroded portion. That is, the corrosive liquid Q permeates from the top to the bottom in the photo-curable layer 3a, but it takes a long time to permeate a thick part of the photocurable layer 3a, and the permeation time of a thin part is fast. become. Therefore, when a predetermined time elapses, for example, when the corrosive liquid Q reaches the vicinity of the bottom of the surrounding hardened portion 3e as shown in the figure, the etching step is stopped to wash the corroded portion.
The shape substantially the same as the shape will be transferred to the metal substrate 4. That is, the peripheral convex portion 4d is formed on the metal substrate 4 so as to correspond to the peripheral cured portion 3e of the photo-cured layer 3a. On the other hand, the relief plate portion 4c having the same shape as the convex cured portion 3c of the photo-cured layer 3a is formed. The substrate thus formed is shown in FIG.
Is shown in.

The metal substrate 4 formed in the first etching step is then subjected to the second etching step. This second etching step is shown in FIG. In this step, before starting the second etching, the non-permeable padding 5, such as an offset, which does not allow the corrosive liquid Q to permeate into the space 4g which is surrounded by the peripheral convex portion 4d and is located above the relief plate portion 4c. Ink is filled. After the filling 5 is thus filled, the second etching is started. Then, in this step, the corrosive liquid Q is permeated into the metal substrate 4 from above to corrode and remove the peripheral convex portions 4d to form a flat portion 4h sufficiently lower than the relief plate portion 4c. The shaping die for a decorative plate thus formed is shown in FIG. The relief plate portion 4c described above is formed as a so-called conduit-corresponding convex portion 4e.

The conduit-corresponding convex portion 4e formed in this manner is very similar to the concave shape of the natural conduit illustrated in FIG. 3, and therefore, this shaping die embosses the decorative plate in the pressing process. For example, it is possible to form a conduit that closely resembles a natural conduit.

By the way, the principle manufacturing method shown in FIGS. 7 to 12 may be inconvenient in practice. That is, if the first mask film 2 is manufactured by the method shown in FIGS. 4 and 5, the subject to be photographed of the first film 10, which is the base of the first mask film, is natural wood, and the size of the numerous conduits of the natural wood is large. Is virtually non-uniform, making it difficult to obtain the desired shade distribution for virtually all conduits. The reason will be described below.

FIG. 13 shows the difference in the appearance of the light and shade distribution corresponding to the large conduit 1'and the small conduit 1 "in the photography exposure method of FIG. 5 above. FIG. An example in which the exposure amounts are combined is shown. That is,
As shown in FIG. 13, when the density distribution curve of the small conduit 1 ″ has a desired shape and the concentration of the central portion is sufficiently guaranteed, the density distribution curve of the large conduit 1 ′ has its center. Not only is the density of the part not sufficiently guaranteed, but also its shape is not as desired. This is because the exposure dose is matched to the small conduit 1 ", so that the exposure dose exposes the large conduit 1 '. This is because the central part of the density distribution curve is barely exposed. Contrary to the above, if the exposure is matched to the larger conduit 1 ', the smaller conduit 1 "will be sacrificed, that is, the exposure will be too much and the density distribution curve will be smooth without creating the desired valley shape. There is a problem that it becomes.

When the mask film 2 has the density distribution curve shown in FIG. 13, the following problems occur when manufacturing a shaping mold using this mask film.

FIG. 14 is a view corresponding to FIG. 11, but the depth t of the space 4g of the metal substrate 4 corresponding to the large conduit 1 ',
That is, the upper part of the central portion of the letterpress portion 4'c becomes extremely shallow, and as a result, the thickness of the central portion of the padding 5 becomes extremely thin. Then, if the second etching step shown in FIG. 11 is performed, the permeation of the corrosive liquid from the central portion of the filling material 5 increases, and as a result, the conduit corresponding convex portion 4 as shown in FIG. 'e, 4 "e will be formed. That is, the convex portion 4" e corresponding to the small conduit 1 "is not a problem, but the convex portion 4'e corresponding to the large conduit 1'is formed on the top. The depression 4i appears because the depression 4i is caused by the corrosion of the corrosive liquid that has permeated the central portion of the filling 5. Of course, this shape is not preferable.

Therefore, the present invention solves the above problem by adding the improvements described in FIGS. 16 to 18 to the basic method shown in FIGS. The above problem is caused by the fact that when the exposure amount is adjusted to the small conduit 1 ", the central portion of the density distribution curve corresponding to the large conduit 1'is extremely dimmed. Therefore, this situation should be avoided. Therefore, in this improvement, in addition to the first mask film 2, the second mask film 6 is also used in the second mask film 6. In the second mask film 6, the conduit shadow portion 6a uniformly emits a small amount of light. It is adjusted to a density that allows it to pass through.

By the way, the density of the shadow area of the conduit of the mask film (transmission density as photographic density) is 1.
It is preferable that the central portion is 8 to 2.0 and the central portion is about 0.6 to 0.7. The width of the conduit is practically about 0.8 to 1.0 mm for the large one and about 0.3 to 0.5 mm for the small one. Therefore, when considering the size of this conduit and taking into consideration the use of the films 2 and 6 in the exposure step shown in FIG.
If the density of the central portion of the conduit shadow portion of the first mask film 2 is about 0.3 to 0.4, adjust the density of the central portion of the conduit shadow portion of the second mask film 6 to about 0.3. Is preferred.

Now, in this improved method, as shown in FIG. 16, the first film 2 and the second film 6 are superposed on the photocurable layer 3a of the carbon tissue 3 and the light L is exposed. In this case, the conduit shaded portions 2a and 6a and the ground portions 2c and 6c correspond to each other. Then, in this case, when the first and second mask films 2 and 6 are viewed as a whole, the density distribution 2b of the first film 2 is the density distribution 6b of the second film 6 as the entire conduit shadow portion. It will be in a state of being raised. In the raised state, a large conduit shadow (2b + 6b) and a small conduit shadow (2'b +)
6'b) is as shown in FIG. As can be seen in the figure, the conduit shadow (2b + 6b) corresponding to the large conduit 1 '
The central part of has a sufficient concentration. Therefore, when the exposure is performed by the improved method, the convex hardened portion 3c is formed shallower than that formed in FIG. 7 (shown by the one-dot chain line in FIG. 16). In this way, hereinafter, FIGS.
The metal substrate 4 ′ having the letterpress portions 4′c and 4 ″ c can be obtained by performing the treatment 2 (FIG. 18), that is, the space above the letterpress portion 4′c corresponding to the large conduit 1 ′. 4g depth t
Is sufficiently secured. Therefore, the thickness of the central portion of the padding 5 filled in the space 4g is sufficiently ensured, and even if the second etching step is performed, the problem as shown in FIG. 15 does not occur.

[0029]

EXAMPLES Preferred examples of the present invention will be shown below.

(1) First Mask Film 2 As for the density of the conduit shadow portion 2a of the first mask film 2, the density of the small conduit shadow portion 1 "(the transmission density of photographic density) is 0.3.
Set it to be about 0.4.

(2) Second mask film 6 The density of the conduit shadow portion 6a of the second mask film 6 is 0.3.
Set to a degree.

(3) Exposure step Light source: Mercury lamp (4 KW) Distance between light source and carbon tissue: 3 to 4 m Exposure time: 4 to 5 minutes * A mesh screen is not used unlike general gravure printing plates.

(4) First Etching Step As the corrosive liquid, a 39 Baume ferric chloride solution having a higher concentration than that used for etching a general gravure printing plate is used. The higher the concentration of the corrosive liquid, the weaker the penetrability into the carbon tissue 3 and the longer the corrosion time, but the profile of the carbon tissue 3 provides an accurate penetration depth. If a corrosive liquid having a low concentration is used, there is a drawback that the top of the relief plate 4c to be obtained is flat.

The end point of the first etching is when the depth of penetration into the metal substrate 4 below the highest part of many convex hardened parts 3c reaches about 10 to 15 microns. This penetration depth corresponds to the shallowest part of the space 4g in FIG. When the penetration depth is less than this, it is difficult to stably hold the filling 5 in the space 4g, that is, the filling cannot completely fill the space 4g. On the other hand, if the penetration depth is more than this, the etching time becomes too long, and as a result, the top of the relief plate 4c tends to be flat.

(5) Filling material An offset ink (diluted with a solvent) or a room temperature curable resin is used. The reason why the room temperature curable resin is used is to enhance the resist effect of preventing the permeation of the corrosive liquid.

The filling is carried out by applying a solution of a room temperature curable resin to the entire upper surface of the metal substrate 4 shown in FIG. 11, scraping off the excess resin with a squeegee, and completely filling the space 4g with the resin. adopt. After that, the resin is cured by leaving it at room temperature for 24 hours. After the resin is completely cured, the resin adhering to the flat surface of the peripheral convex portion 4d is removed by polishing with a grindstone so that the resin does not adhere to the portion other than the space 4g.

(6) Second Etching Step As with the first etching, the corrosive liquid is etched using a 39 Baume thick liquid to remove the portion other than the space 4g not etched in the first etching. Since it is necessary to etch a far larger area than the first etching, it takes about 10 minutes.

After completely removing the portion other than the space 4g formed by the first etching, the etching is further continued, and the etching is performed when the height of the top of the highest relief plate portion 4c reaches 70 to 80 microns. To stop.

It is preferable for the embossing plate to have a height of the relief plate portion 4c of about 100 μm, but if etching is performed for a long time in order to increase the height of the relief plate portion 4c,
In the shallowest part of the space 4g formed by the first etching, the thickness of the resist film due to the filler is thin, so that the etching solution may penetrate, so that the top of the mountain becomes flat and the gradation becomes poor. There's a problem.

(7) Removal of fillings The fillings made of curable resin remaining on the top of the relief plate 4c are wiped off completely with a brush using an organic solvent.

[Brief description of drawings]

FIG. 1 is a plan view showing a surface of natural wood having a conduit pattern.

2 is a diagram schematically showing the natural wood conduit of FIG. 1. FIG.

FIG. 3 is an explanatory view showing a cross section of the natural conduit of FIGS.

FIG. 4 is a side view of a first mask film according to the present invention.

FIG. 5 is a diagram showing a method of manufacturing a first mask film.

FIG. 6 is a diagram showing a method of manufacturing the first film 10 in FIG.

FIG. 7 is a cross-sectional view showing an exposure process according to the present invention.

FIG. 8 is a cross-sectional view showing a state in which a photocurable layer and a metal substrate are laminated in the manufacturing method of the present invention.

FIG. 9 is a diagram showing a first etching step in the present invention.

FIG. 10 is a cross-sectional view showing a substrate formed as a result of the first etching process and the subsequent cleaning process.

FIG. 11 is a diagram showing a second etching step in the present invention.

FIG. 12 is a cross-sectional view showing a shaping mold formed in the manufacturing method of the present invention.

FIG. 13 is a diagram showing respective light and shade distribution curves of a large conduit shadow portion and a small conduit shadow portion occurring in the first mask film used in the principle method of FIGS.

14 is a diagram showing a metal substrate manufactured using the mask film of FIG.

FIG. 15 is a view showing a shaping mold manufactured from the metal substrate of FIG.

FIG. 16 is a sectional view showing an exposure step in the improved manufacturing method of the present invention.

FIG. 17 is a diagram showing the concentration distribution of the entire conduit shadow area (each conduit shadow area corresponding to a large conduit and a small conduit) of the mask film when exposed by the method of FIG. 16;

FIG. 18 is a diagram showing a metal substrate obtained as a result of performing the exposure process and performing a series of processes thereafter by the method of FIG. 16;

[Explanation of symbols]

1 Conduit 1a Surrounding Shallow 1b, 1 ', 1 "Deep 2 Mask film 2a, 2'a, 2" a Conduit shadow 2b Concentration distribution 2c Ground 3 Carbon tissue 3a Light curing layer 3b Base paper 3c Convex curing 3d Unhardened part 3e Peripheral hardened part 4,4 'Metal substrate 4c, 4'c, 4 "c Letterpress part 4d Surrounding convex part 4e, 4'e, 4" e Convex part corresponding to conduit 4g Space 4h Flat part 4i Top part 5 Filling material 6 2nd mask film 6a Conduit shadow area 6b Grayscale distribution 6c
Base part 10 First film 10a Conduit shadow part 10c Base part 11 Second film 11a Conduit transparent part 11c Base part 12 Camera L Light Q corrosive liquid

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroki Kojima 1-1-1 Ichigaya-Kagacho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. (72) Inventor Shunji Parki 1 Ikaya-Kagacho, Shinjuku-ku, Tokyo 1-1-1, Dai Nippon Printing Co., Ltd. (72) Inventor Yoshiaki Aota 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Within Dai Nippon Printing Co., Ltd.

Claims (1)

[Claims] 1. A conduit shaded portion in which the concentration changes from dark to light corresponding to the depth of the natural conduit (1) to the depth thereof.
A first mask film (2) having (2a) and having a substantially transparent ground portion (2c) other than the conduit shadow portion (2a), and a conduit shadow having a uniform light density corresponding to the natural conduit (1). The second mask film (6) having the part (6a) and the ground part (6c) other than the conduit shadow part (6a) being substantially transparent is matched with both conduit shadow parts (2a, 6a). As described above, the photocuring layer (3a) of the carbon tissue is exposed through these mask films (2, 6), and the portions corresponding to the ground portions (2c, 6c) are sufficiently photocured to cure the peripheral curing portion. (3e) is formed, and at the same time, the portion corresponding to the conduit shadow portion (2a, 6a) is photo-cured at a depth of the profile corresponding to the concentration to form a convex cured portion (surrounded by the peripheral cured portion (3e) ( 3c) exposure step, and the exposed photocurable layer (3a) is bonded to the metal substrate (4) and the photocurable layer (3a) is convexly cured with warm water. The developing step of removing the uncured portion (3d) adjacent to (3c), and then the corrosive liquid (Q) is permeated from above the photocurable layer (3a), and the metal substrate (4) thereunder is exposed to light. By corroding the corrosive liquid (Q) to the depth of the profile corresponding to the thickness and shape of the hardened layer to corrode and remove the upper layer of the metal substrate (4), unevenness corresponding to the uneven shape of the photocurable layer (3a) is obtained. By transferring the shape, the peripheral convex portion (4d) corresponding to the peripheral cured portion (3e) of the photocurable layer (3a) and the relief plate portion (4) surrounded by the peripheral convex portion (4d).
c) and a space (4g) surrounded by the peripheral projections (4d) of the metal substrate (4) formed in the first etching step and located above the relief plate (4c). ) Is filled with a non-permeable filler (5), and then the metal substrate (4) is permeated with a corrosive liquid (Q) from above to corrode and remove the surrounding convex portion (4d) to form a relief plate portion (4c). Lower flats
And a second etching step of forming (4h).