JP4700921B2 - Indicator manufacturing method - Google Patents

Description

  The present invention relates to an index such as a mark, a symbol, or a number, and more particularly to an index used for a display board and a manufacturing method thereof.

  Indicators such as time letters, product names, brand names, etc. are used for the timepiece display board, but these indicators are thick and have a three-dimensional appearance that gives the watch itself a high-class feel. It makes me feel. Various methods have been conventionally used for producing such a thick index. One of them is a manufacturing method disclosed in Patent Document 1 below.

Japanese Patent Laid-Open No. 3-17689

  The manufacturing method disclosed in Patent Document 1 will be described with reference to FIG. FIG. 6 is a cross-sectional view of a main part showing the order of steps in the method of manufacturing the typesetting disclosed in Patent Document 1. First, the surface of the brass plate 11 is finished to a mirror surface, finish plating is performed thereon, and the base film 12 with the adhesive material 12a is stuck thereon (FIG. 6A). Next, a photoresist film 13 is formed on the opposite surface of the brass plate 11, and a photomask is disposed thereon, and exposure, development, and the like are performed to form a resist pattern 13a. Then, an etching solution is sprayed to make the typesetting 14 (FIG. 6B). Next, after plating the side face of the typesetting 14, the photoresist film 13 is peeled off with a solvent, and an adhesive 15 is formed at the peeled surface (FIG. 6C). Next, the typesetting 14 is bonded to a predetermined position of the display panel 16 via the adhesive 15 and the base film 12 is peeled off (FIG. 6D).

  It is said that a glossy and three-dimensional typesetting was obtained by taking the above manufacturing method. However, under the above manufacturing method, the side face of the typesetting does not appear glossy. When a brass plate is etched with an etching solution, the surface becomes rough, and even if plating is performed thereon, the plated surface is uneven and gloss does not appear. The upper side of the typesetting has a mirror finish, so it looks glossy and beautiful, but the side is not glossy. Moreover, in the typesetting that is thick and has a three-dimensional appearance, the side surface is also visually recognized, the matte side surface becomes conspicuous, the glossiness is also crisp, and it feels that the glossiness is still unsatisfactory. It was. Further, although a brass plate is used as a material, this material is soft and has a problem that it is difficult to work because it is easily scratched to be polished to a mirror surface.

  In addition, although the side face of the typesetting is plated on the surface of the brass material, it is not always sufficient when considering the corrosion resistance over a long period of time. In particular, if the surface is uneven, corrosion such as rust is likely to occur.

The present invention has been made in view of the above problems, and as means for solving the problems, the invention of the manufacturing method according to claim 1 of the present invention includes a step of cleaning a stainless steel plate having a mirror surface. A step of forming a metal vapor deposition film on the mirror surface of the stainless steel plate, a step of attaching a protective sheet on the surface on which the vapor deposition film is formed, a step of forming a photoresist film on the lower surface of the stainless steel plate, A step of arranging a photomask on the photoresist film, exposing and developing, dissolving and removing the unnecessary photoresist film, and drying the remaining photoresist film, the upper surface of the stainless steel plate becomes wider than the lower surface. and etching as a step of electrolytic polishing after the etching, is characterized in that and a step of removing the photoresist film.

Further, the invention of the manufacturing method according to claim 2 of the present invention is a step of cleaning a stainless steel plate having a mirror surface and slightly roughening the mirror surface, and a step of applying strike nickel plating on the stainless steel plate having a slightly rough mirror surface. And a step of applying bright nickel plating after the strike nickel plating, a step of applying colored plating after applying the bright nickel plating, a step of attaching a protective sheet on the surface subjected to the colored plating, A step of forming a photoresist film on the lower surface of the stainless steel plate, a step of disposing a photomask on the photoresist film, exposing and developing, and dissolving and removing unnecessary portions of the photoresist film; a step of the stainless steel plate top surface is etched so as wider than the lower surface after the resist film is dried, the electrolyte Labs after the etching It is characterized in further comprising the steps of, and a step of removing the photoresist film.

The invention of the manufacturing method according to claim 3 of the present invention is characterized in that an uneven pattern is formed on the upper surface of the stainless steel plate.

The invention of the manufacturing method according to claim 4 of the present invention is characterized in that at least one recess is formed on the lower surface of the stainless steel plate.

As an effect of the invention, the index obtained from the production method of the present invention is made of a stainless steel material. Therefore, the corrosion resistance is very good. In addition, since the material is hard, scratches and the like are hardly attached, and a beautiful mirror surface can be obtained. The upper surface is wider than the lower surface. Therefore, when viewed from above, the lower surface side cannot be seen, and the side surface side cannot be seen. In addition, the side surface is difficult to see even when the index is viewed from an oblique direction. In addition, the top and side surfaces are mirror-finished and glossy. Gloss appears on the entire surface, and at a glance, it is impossible to distinguish between the upper surface and the side surface. Gloss appears throughout the index, giving it a three-dimensional feel and a sense of luxury.

Further , the index obtained from the production method of the present invention is that a metal vapor deposition film or a metal plating film is formed on the upper surface, and a metallic luster color tone having a desired color tone appears. The decorativeness is enhanced and color variations can be enriched. Further, an uneven pattern is also formed on the upper surface. A shiny pattern appears, which also enhances the decorativeness. A wide variety of design variations are available in patterns and colors.

Moreover, the index obtained from the manufacturing method of the present invention has a recess on the lower surface. This recess is provided for the purpose of increasing the adhesive reservoir and the bonding area, and increases the bonding area between the index and the adhesive, thereby producing an effect of strengthening the adhesive fixation. Further, by providing this recess, the protrusion of the adhesive from the index is reduced, and the appearance quality of the bonded portion between the index and the display plate is improved.

  If the indicator of the present invention, which is thick and has a metallic luster, is attached to the display board via an adhesive provided on the lower surface, the display board has a metallic luster, precious metal, high decoration, and three-dimensionality. Produces an effect that gives it a sense of luxury.

  Hereinafter, the best embodiment of the present invention will be described with reference to FIGS. First, the figure will be explained. FIG. 1: has shown principal part sectional drawing when the parameter | index which concerns on 1st Embodiment of this invention is affixed on the display board. 2 is a process diagram showing a method of manufacturing the index in FIG. 1, FIG. 2 (a) is a sectional view in which the upper surface of the stainless steel plate is a mirror surface, and FIG. 2 (b) is a state in which a metal vapor deposition film is formed. 2C is a cross-sectional view with a protective sheet attached, FIG. 2D is a cross-sectional view with a photoresist film formed, and FIG. 2E is a photomask disposed. FIG. 2F is a cross-sectional view of the exposed state, FIG. 2F is a cross-sectional view of a state where an unnecessary portion of the photoresist film is dissolved and removed, and FIG. 2G is a cross-sectional view of the stainless steel plate etched. 2 (h) is a cross-sectional view of the electropolished state, FIG. 2 (i) is a cross-sectional view of the remaining photoresist film, and FIG. 2 (j) is a cross-sectional view of the state where the adhesive is applied. Yes. FIG. 3 is an enlarged cross-sectional view for explaining a state when electrolytic polishing is performed after etching in FIGS. 2 (g) and 2 (h). FIG. 4 shows a cross-sectional view of the main part when the indicator according to the second embodiment of the present invention is attached to the display board. 5 is a process diagram showing a method of manufacturing the index in FIG. 4, FIG. 5 (a) is a sectional view in which the upper surface of the stainless steel plate is a mirror surface, and FIG. 5 (b) is the stainless steel in FIG. 5 (a). FIG. 5 (c) is a cross-sectional view with strike nickel plating, FIG. 5 (d) is a cross-sectional view with bright nickel plating, and FIG. 5 (e) is a decorative metal plating. FIG. 5F shows a cross-sectional view in a state where a protective sheet is pasted.

As shown in FIG. 1, the index 29 according to the first embodiment of the present invention is composed of an index chip 20c made of a stainless steel material and a metal vapor deposition film 21a formed on the upper surface 20a. The index 29 is bonded and fixed to a predetermined position of the display panel 30 through the adhesive 25. The metal vapor deposition film 21a is provided for coloring for decoration. In this embodiment, a gold (Au) vapor deposition film is formed to give a golden color tone. However, the metal vapor deposition film 21a is not particularly limited. A vapor deposition film may be formed. For example, when a thin film of a chromium (Cr) vapor deposition film and a chromium oxide (Cr ₂ O ₃ ) vapor deposition film is laminated, black or blue color (these colors change the film thickness of each of the Cr vapor deposition film and the Cr ₂ O ₃ vapor deposition film). The color tone can be obtained. The indicator chip 20c is made of a stainless steel material, and is formed by an etching method such as etching or electrolytic polishing described later. Further, the upper surface 20a and both side surfaces 20g are finished to be mirror surfaces and have gloss. Therefore, the metal vapor deposition film 21a provided on the upper surface 20a is also glossy. In addition, the lower surface 20b of the index chip 20c is bonded and fixed to a predetermined position of the display panel 30 through the adhesive 25.

  Further, in this indicator 29, the width dimension m1 of the upper surface is larger than the width dimension m2 of the lower surface. Therefore, when the index 29 is viewed from above the index 29, the side surface 20g is not visible, and only the gold vapor deposition film 21a is visually recognized as a glossy gold color. Even when viewed from an oblique direction, when the index 29 is thin, the side surface is hardly visually recognized. When the thickness of the indicator 29 is thick, the distinction from the side surface is somewhat visually recognized, but the side surface is almost conspicuous because the gloss appears on the side surface and the gold color of the glossy gold deposited film on the upper surface is conspicuous. Absent. In addition, a glossy appearance appears throughout, and an index that gives a feeling of precious metal is visually recognized. The indicator 29 is formed using a stainless steel material. It has strong corrosion resistance and is hard, so scratches are unlikely to occur and a beautiful mirror surface can be obtained.

Next, a method for manufacturing the indicator 29 will be described with reference to FIG. A stainless steel plate 20 having a desired thickness is prepared, and the upper surface 20a is finished to a mirror surface by lapping or the like (FIG. 2 (a)). You may purchase and use the commercially available stainless steel plate in which the mirror surface process was given. Next, the stainless steel plate 20 is cleaned. This is done to improve the adhesion of metal deposition performed in the next process. Degreasing with a neutral detergent solution → Pickling with a 3% solution of hydrochloric acid or a 5% solution of sulfuric acid → Washing with pure water → Hot air, etc. Wash through the drying step. Next, the metal vapor deposition film 21 is formed on the upper surface 20a finished to a mirror surface (FIG. 2B). In the present embodiment, a gold vapor deposition film is formed. This is because a vacuum vapor deposition machine is used, and the pressure during vapor deposition in the chamber of the vapor deposition machine is 1 × 10 ^{−6 to} 5 × 10 ⁻⁵ torr. (1.33 × 10 ^{−4 to} 6.65 × 10 ⁻³ Pa) is preferable. When the deposited film thickness is in the range of 700 to 1000 mm, the original metallic color of gold can be obtained. Next, the protective sheet 22 is affixed through an adhesive (FIG. 2C). As the protective sheet 22, a polyethylene terephthalate resin sheet or the like can be suitably used, but the material is not particularly limited, and a sheet having strong heat resistance and tension is preferable. Next, a photoresist film 23 is formed on the lower surface 20b of the stainless steel plate 22 by a known method such as screen printing or a spin coater (FIG. 2D). The film thickness may be in the range of about 10 to 20 μm.

Next, a photomask 24 obtained by photographing the shape of the index is placed on the photoresist film 23, exposed to ultraviolet rays, and exposed (FIG. 2 (e)). Then, development is performed to leave the cured resist film 23a corresponding to the index portion, and the other soft portion of the resist film 23b is dissolved using an organic solvent dedicated to resist, such as xylene, toluene, or acetone. (FIG. 2 (f)). Then, after the remaining resist film 23a is dried and completely cured, a stainless steel material is melted to a predetermined depth by spraying an etching solution of ferric chloride of 35 to 45 Be ′ and 40 ° C. (FIG. 2 (g)). This etching is stopped in a state where 30 to 50 μm is left with respect to the finished size. The etching rate can also be increased by adding a small amount of hydrochloric acid to the ferric chloride etching solution. Next, the etched portion is finished by electropolishing (FIG. 2H). Electropolishing uses a bath solution of phosphoric acid 65 to 75%, sulfuric acid 15 to 12%, chromic anhydride 15 to 12%, (weight%) specific gravity 1.74, current density 35 to 50 A / dm ² , temperature 65 Polishing is performed under conditions of ˜80 ° C. and time of 10 to 15 minutes, and polishing is performed at 30 to 50 μm. By this electrolytic polishing, an index chip 20c of a material serving as an index is obtained, and the metal vapor deposition film 21 is also shaved, leaving only the metal vapor deposition film 21a at the index chip 20c. Moreover, the side surface 20g of the indicator chip 20c is finished to a mirror surface by this electrolytic polishing. Next, the remaining cured photoresist film 23a is stripped with a stripping solution (FIG. 2 (i)). As a result, an index 29 composed of the index chip 20c and the metal vapor deposition film 21a is obtained. Next, when the index 29 is attached to the display board, an adhesive 25 is formed at the trace of the peeled photoresist film 23a (FIG. 2 (j)). The adhesive 25 can be formed by masking, spray coating, printing, or other known methods. It is also possible to provide the adhesive 25 by screen printing or offset printing without masking. Finally, the indicator 29 is attached to a predetermined position of the display board 30 via the adhesive 25, and the protective sheet 22 is peeled off, whereby the display board attached with the indicator 29 shown in FIG.

  Here, the index 29 of the present invention is such that the upper surface width m1 is wider than the lower surface width m2. A method of forming this wide will be described with reference to FIG. When the stainless steel plate 20 is etched, not only in the depth direction, but also in the width direction, that is, the side surface is melted and scraped off to show a drum-like shape and etched. Moreover, the corner portion in the depth direction, that is, the A portion indicated by a circle in FIG. 3 is etched with an R shape. Further, even if electrolytic polishing of 30 to 50 μm is performed after the etching, it is polished according to the shape etched by the etching, so that the corner portion at the back is finished in an R shape. Therefore, if the etching time and the polishing time for electropolishing are sufficiently managed so that the electropolishing is terminated when the width of the upper surface of the indicator 29 is larger than the width of the lower surface, the upper surface width is reduced to the lower surface width. It can be formed wider.

  By taking the above manufacturing method, the upper surface and the side surface of the index are finished to a mirror surface, and mirror gloss appears. In addition, since the upper surface of the index can be formed wider than the lower surface, the side surface becomes invisible.

  Further, since the metal vapor deposition film is provided for decorative coloring, various colors can be obtained by changing the type of metal used. In addition, various color indexes can be obtained by laminating two kinds of metals and changing their thickness and the like slightly. And it can have abundant color variations of the indicator. An uneven pattern can also be provided on the upper surface of the index. An uneven pattern may be provided on a mirror-finished stainless steel plate by a stamping method. By providing a pattern, the decoration variation can be increased.

  Next, an index according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 4: has shown principal part sectional drawing of the state which affixed the parameter | index which concerns on 2nd Embodiment of this invention on the display board. FIG. 5 is a partial process diagram illustrating a method of manufacturing the index in FIG.

  As shown in FIG. 4, the indicator 49 according to the second embodiment includes an indicator chip 40c made of stainless steel, a strike nickel plated film 41a formed on the upper surface 40a, and a gloss applied on the strike nickel plated film 41a. A nickel plating film 42a and a decorative metal plating film 43a formed on the bright nickel plating film 42a are also included. That is, the strike nickel plating film 41a, the bright nickel plating film 42a and the decorative metal plating film 43a are laminated. Then, it is used by being affixed to a predetermined position of the display panel 30 through an adhesive 45. The index of the first embodiment described above gives the color tone of the index with the metal vapor deposition film, but the index of this embodiment shows the color tone with the metal plating film. The indicator 49 of the present embodiment is gold-colored by forming a gold-plated film as the decorative metal-plated film 43a. Decorative colors can also appear in other colors by selecting the metal type of the top metal plating. For example, when white rhodium is plated, an indicator of whiteness is obtained, and when black ruthenium is plated, a black indicator is obtained. The metal plating film 43a formed on the uppermost layer has a specular gloss. This specular gloss appears when the bright nickel plating film 42a is provided. Also, both side surfaces 40g of the index chip 40c have a specular gloss. In addition, the index 49 of the present embodiment is formed so that the upper surface width of the index 49 is wider than the lower surface 40b (the side of the bonding surface with the display panel), as in the first embodiment. Furthermore, the indicator 49 of the present embodiment has a recess 40h on its lower surface 40b. The recess 40h is provided to further strengthen the adhesive strength with the display panel 30. If there is a recess, the adhesive will enter it and the bonding area will increase. By increasing the bonding area, the bonding strength increases. In addition, since the adhesive enters the concave portion, the amount of the adhesive that protrudes to the outer periphery of the index is reduced, which leads to an effect of improving the appearance. The shape of the recess 40h is not particularly limited, and may be provided in a groove shape or in a conical shape. If necessary, two or three may be provided. In particular, the number and shape are not limited.

  The index 49 having the above-described configuration has the same effect as the index of the first embodiment described above, and also has the effect of increasing the adhesive strength with the display panel. Of course, various uneven patterns can be provided on the upper surface of the indicator 49.

Next, a method for manufacturing the indicator 49 having the above configuration will be described with reference to FIG. As an index of the present embodiment, a stainless steel plate having a mirror surface is used as in the first embodiment. FIG. 5A shows a stainless steel plate 40 in which the upper surface 40a is a mirror surface and the lower surface 40b is formed with a recess 40h. The recess 40h is provided by a pressing method, a cutting method, or the like. The mirror surface can be provided by a method such as grinding polishing, lapping polishing, or electrolytic polishing. Next, the stainless steel plate 40 is degreased and cleaned. Degreasing and washing are performed in the order of degreasing → pickling → pure water washing → drying. Degreasing is performed with a neutral detergent solution. The pickling is performed by dipping in a 10-20% sulfuric acid solution at about 70 ° C. until gas is generated. This pickling is performed with a high concentration of sulfuric acid, so that the mirror surface is violated and the surface becomes a little rough, resulting in a satin finish. Pure water washing is performed to neutralize the sulfuric acid solution adhering to the surface and to wash away well. Drying is performed by hot air drying, centrifugal drying or the like. In this cleaning step, the stainless steel plate is cleaned and the mirror surface is roughened. This is performed in order to improve the adhesion of the plating, and the upper surface 40a is a satin finish surface (FIG. 5B). Next, strike nickel plating is performed to provide a nickel plating film 41 of about 0.3 μm (FIG. 5C). This strike nickel plating is performed in order to improve the adhesion of the next bright nickel plating. In a plating bath solution of nickel chloride 240 g / l and hydrochloric acid 80 to 120 g / l, the current density is 5 to 20 A / dm ² . Under, it is performed by dipping for 2 to 4 minutes at room temperature. Next, bright nickel plating is performed on the strike nickel plating film 41 to form a bright nickel plating film 42 (FIG. 5D). Although the plating thickness is in the range of 3 to 10 μm, the plating surface has a mirror finish and gloss appears. Next, decorative metal plating is performed on the bright nickel plating film 42 to form a metal plating film 43 (FIG. 5E). In the present embodiment, gold plating is performed and gold coloration is performed, but white rhodium plating is used to obtain white coloration. Further, when black ruthenium plating is applied, black coloring is obtained. Since this metal plating for decoration is for coloring, a thickness of about 0.1 to 0.3 μm is sufficient. Next, the protective sheet 44 is pasted on the metal plating film 43 (FIG. 5F). Subsequent steps after the step of attaching the protective sheet take exactly the same steps as those in the first embodiment. That is, a photoresist film is formed on the lower surface 40b side of the stainless steel plate 40, a photomask is provided, exposed to ultraviolet rays, exposed, developed, etc., to remove the resist film in portions other than the index portion, Next, the remaining resist film is dried and completely cured, and then etching and electropolishing are performed. Finally, the photoresist film is peeled off to obtain the index 49. Since these steps are the same as those in the first embodiment, description thereof is omitted.

  Through the above steps, the index 49 shown in FIG. 4 is obtained. Gloss appears on the uppermost metal plating film 43 of the index 49, and gloss also appears on the side surface 40g, so that the side surface is hardly noticeable and a glossy index is obtained as a whole. Since the entire surface of the visible indicator is mirror-finished, the corrosion resistance is very good as well as the utility of stainless steel. In addition, various colors of decoration can be obtained by changing the metal type of the decorative metal plating film provided on the uppermost layer of the indicator 49. And you can arrange a wide variety of decoration colors. Of course, various uneven patterns can also be provided. Further, as in the present embodiment, if the concave portion is provided on the lower surface of the index, an effect of further increasing the adhesive strength can be obtained.

  In addition, as for the parameter | index of 1st Embodiment and the parameter | index of 2nd Embodiment, all have finished the side surface of the parameter | index into the mirror surface specification by electrolytic polishing. However, if the upper surface of the index is wider than the lower surface, the side surface is hardly visible when the thickness of the index is reduced to 0.2 mm or less. Therefore, since a corrosion-resistant material is used, even if the electrolytic polishing process is omitted and the index shape is formed only by the etching process, it can be used without any problem. In addition, after electropolishing, it is possible to form a decorative metal film on the side of the indicator chip by performing cleaning and drying, and performing dry plating (evaporation, ion plating, sputtering, etc.) or wet plating. It is. It is also possible to unify the indicators with the same color tone. Note that in the case where a decorative metal film is provided on the side surface of the index chip, the resist film may be peeled off with a peeling solution after the metal film is formed.

  The indicator of the present invention can be used for various display boards. Display boards for watches, display boards for meters of various equipment devices, nameplates, etc., but can also be used as a single indicator for various equipment devices.

It is principal part sectional drawing when the parameter | index which concerns on 1st Embodiment of this invention is affixed on the display board. FIG. 2A is a cross-sectional view showing a method of manufacturing an index in FIG. 1, FIG. 2A is a cross-sectional view in which the upper surface of a stainless steel plate is a mirror surface, and FIG. 2B is a cross-sectional view in a state in which a metal vapor deposition film is formed. 2 (c) is a sectional view with a protective sheet attached, FIG. 2 (d) is a sectional view with a photoresist film formed, and FIG. 2 (e) is a state in which a photomask is provided and exposed. FIG. 2F is a cross-sectional view of a state where an unnecessary portion of the photoresist film is dissolved and removed, FIG. 2G is a cross-sectional view of a stainless steel plate etched, and FIG. FIG. 2 (i) is a sectional view in a state where the remaining photoresist film is peeled off, and FIG. 2 (j) is a sectional view in a state where an adhesive is applied. FIG. 3 is an enlarged cross-sectional view illustrating a state when electropolishing is performed after etching in FIGS. 2 (g) and 2 (h). It is principal part sectional drawing when the parameter | index which concerns on 2nd Embodiment of this invention is affixed on the display board. FIGS. 5A and 5B are process diagrams showing a method of manufacturing the index in FIG. 4, in which FIG. 5A is a cross-sectional view of a stainless steel plate with a mirror surface on the upper surface, and FIG. 5 (c) is a cross-sectional view with strike nickel plating, FIG. 5 (d) is a cross-sectional view with bright nickel plating, and FIG. 5 (e) is a cross-sectional view with decorative metal plating. FIG.5 (f) is sectional drawing of the state which affixed the protection sheet. FIG. 6 (a) is a cross-sectional view of the main part showing the order of the manufacturing method of the typesetting shown in Patent Document 1, and FIG. 6 (a) shows a finish plating on the surface of the brass plate finished to a mirror surface, FIG. 6B is a cross-sectional view showing the pasted state, in which a photoresist film is provided on the opposite surface of the brass plate, and a resist pattern is formed by performing exposure, development, etc. using a photomask. FIG. 6C is a cross-sectional view showing a state where an adhesive is formed by peeling the photoresist film after plating the side face of the typesetting, and FIG. ) Is a cross-sectional view showing a state where the base film is peeled off by bonding the typesetting to the display board via an adhesive.

Explanation of symbols

20, 40 Stainless steel plate 20a, 40a Upper surface 20b, 40b Lower surface 20c, 40c Index chip 20g, 40g Side surface 40h Recess 21, 21a, metal vapor deposition film 22, 44 Protective sheet 23, 23a Photoresist film 24 Photomask 25, 45 Adhesive 30 Display board 41, 41a Strike nickel plating film 42, 42a Bright nickel plating film 43, 43a Metal plating film for decoration m1 Width of upper surface m2 Width of lower surface

Claims (4)

Cleaning a stainless steel plate having a mirror surface;
Forming a metal vapor deposition film on the mirror surface of the stainless steel plate;
A step of attaching a protective sheet on the surface on which the deposited film is formed;
Forming a photoresist film on the lower surface of the stainless steel plate;
A step of disposing a photomask on the photoresist film, exposing and developing, and dissolving and removing unnecessary portions of the photoresist film;
Etching the stainless steel plate so that the upper surface is wider than the lower surface after drying the remaining photoresist film;
Electropolishing after the etching;
Peeling the photoresist film;
A method for producing an index characterized by comprising: Cleaning the stainless steel plate having a mirror surface and slightly roughing the mirror surface;
Applying strike nickel plating on a stainless steel plate with a slightly roughened mirror surface;
Applying the bright nickel plating after the strike nickel plating;
Applying colored plating after applying the bright nickel plating;
A step of attaching a protective sheet on the colored plated surface;
Forming a photoresist film on the lower surface of the stainless steel plate;
A step of disposing a photomask on the photoresist film, exposing and developing, and dissolving and removing unnecessary portions of the photoresist film;
Etching the stainless steel plate so that the upper surface is wider than the lower surface after drying the remaining photoresist film;
Electropolishing after the etching;
Peeling the photoresist film;
A method for producing an index characterized by comprising: Method for producing an indicator according to claim 1 or claim 2, characterized in that the formation of the uneven pattern on the upper surface of the stainless steel plate. Method for producing an indicator according to claim 1 or claim 2, characterized by forming at least one recess on a lower surface of the stainless steel plate.

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