JP2007224331A - Method for producing electrocast parts, electrocast parts, and watch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing electrocast parts that can be tightly attached to a substrate regardless of the shape of the surface of the substrate, onto which the electrocast parts are attached, and are hardly detached from the substrate. <P>SOLUTION: This production method comprises the steps of: forming a resist part 5 on a base plate 4; deforming the base plate 4 so as to match the shape of the surface of the substrate, on which the electrocast parts are formed, in a state of having the resist part 5 formed on the substrate 4; and forming the electrocast parts 1 on the deformed substrate 4 with an electrocasting technique while using the resist part 5. Thereby, the surface 3 of the formed electrocast parts 1, which contacts the substrate, can be the same shape as that of the substrate on which the electrocast parts 1 are formed. Accordingly, it is possible to form the electrocast parts 1 so as to be tightly attached to the substrate regardless of the shape of the substrate, and to prevent the electrocast parts 1 from being detached from the substrate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing an electroformed part, an electroformed part produced thereby, and a timepiece including the electroformed part.

  Decorative parts such as letters, numbers, and patterns pasted on a dial of a watch are sometimes manufactured by electroforming (for example, Patent Document 1). A decorative part manufactured by electroforming has a certain degree of thickness and thus has a three-dimensional effect. In addition, since the decorative part can be formed of metal, a high-class feeling can be produced.

Japanese Patent Laid-Open No. 10-25591 (pages 3 to 5)

By the way, with the diversification of designs in decorative objects such as watches in recent years, the shapes of decorative objects have also diversified. There is a need for electroformed parts that can be installed.
However, in the conventional method for producing an electroformed component, the surface on which the electroformed component is attached is flat. There has been a problem in that the electroformed part falls off, is partially peeled off, or the position of the electroformed part is shifted.

  An object of the present invention is to provide an electroformed component manufacturing method capable of being stuck to a base material regardless of the shape of the base surface of the base material and preventing detachment from the base material. It is an object of the present invention to provide an electroformed part and a timepiece having the electroformed part.

  The method for producing an electroformed component according to the present invention includes: a resist part forming step for forming a resist part on a substrate; and the substrate is attached to a surface of a base material in a state where the resist part is formed on the substrate. It is characterized by comprising a substrate deformation step for deforming in accordance with the shape, and an electroforming step for forming the electroformed part by electroforming on the deformed substrate using the resist portion.

  According to the present invention as described above, in the substrate deformation step, the shape of the substrate is deformed in accordance with the shape of the surface to be pasted of the base material, and in the electroforming step, electroforming is performed on the substrate thus deformed. The shape of the pasting surface of the formed electroformed part is the same as the shape of the pasting surface of the substrate. Therefore, regardless of the shape of the base material, the electroformed component can be stuck and pasted to the base material, and detachment or partial peeling of the electroformed component from the base material can be prevented.

  Furthermore, in the present invention, in the substrate deforming step, it is preferable that a penetrating nigga for preventing distortion of the substrate due to the deformation is formed in the substrate before the substrate is deformed. Thereby, since the distortion of the substrate generated with the deformation of the substrate can be absorbed, it is possible to prevent the generation of the distortion on the substrate and to facilitate the peeling transfer of the electroformed component. Therefore, since the shape of the electroformed part can be matched to the shape of the surface of the base material, the electroformed part can be attached in close contact with the base material. Desorption from the material can be prevented.

And the electroformed part of this invention was manufactured with the manufacturing method of the above-mentioned electroformed part, It is characterized by the above-mentioned.
In addition, the timepiece of the present invention is characterized by including the above-described electroformed component.

  According to the present invention as described above, the electroformed part is manufactured by the above-described electroformed part manufacturing method, and the timepiece includes the above-described electroformed part. While being able to stick and stick to a base material, the detachment | leave from a base material can be prevented.

  According to the method for producing an electroformed part of the present invention, the electroformed part produced by this production method, and the timepiece equipped with this electroformed part, the electroformed part can be used regardless of the shape of the surface of the substrate to be adhered. It can be stuck to the base material, and can be prevented from being detached from the base material.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a timepiece 90 according to an embodiment of the present invention. In FIG. 1, a scale part 1 is an electroformed part according to the present invention. The scale component 1 is affixed to a dial 91 as a base material to decorate the timepiece 90, and a plurality of scale parts 1 are bonded to the scale positions on the adherend surface 91A of the dial 91.

  The scale component 1 is made of any metal material such as nickel (Ni), copper (Cu), gold (Au), silver (Ag), etc. so that the residual stress after formation becomes small, and is shown in FIG. As shown, the decorative surface 2 and the pasting surface 3 pasted on the dial 91 with an adhesive or the like are provided. The decorative surface 2 is gold-plated by flash plating (about 0.1 to 0.5 μm thick), for example, and the pasting surface 3 is formed in a curved shape according to the surface shape of the dial 91. Yes. In addition, in this embodiment, the scale component 1 whose electroforming thickness dimension is 30 micrometers is used. In each drawing including FIG. 2, in order to make it easy to see the steps of the scale component 1 and the manufacturing method thereof, the dimensions and magnitude relationships of the respective parts are partially exaggerated.

Such a scale part 1 is manufactured as follows.
FIG. 3 shows a flowchart of the manufacturing method until the scale component 1 is completed. As shown in FIG. 10, the manufacturing method of the scale component 1 is a resist portion forming step (step S <b> 1 to step S <b> 7) for forming a resist portion 5 on the substrate 4 for forming the scale component 1 by electroforming. And a substrate deformation step (step S8 to step S10) for deforming the substrate 4 on which the resist portion 5 is formed in accordance with the shape of the surface 91A of the dial 91, and the resist portion 5 by electroforming. 4 includes an electroforming process (step S11) for forming the scale component 1 on the surface 4 and a surface plating process (step S12) for plating the surface of the scale component 1. Further, after the surface plating process, a transfer step (step S13 to step S15) for transferring the formed scale component 1 from the substrate 4 to the transfer sheet, and an adhesive for applying an adhesive to the attaching surface 3 of the scale component 1 An application process (step S16) and a pasting process (step S17) for pasting the scale component 1 to the dial 91 are provided.

In the resist portion forming step, first, in step S1, a simultaneous punching process is performed on the substrate 4 using a simultaneous punching die, and the substrate 4 is opposed on one diagonal line as shown in FIG. Pilot holes 41 are formed at the corners.
Here, the substrate 4 is a flat plate member having a uniform surface finish so that the thickness dimension of the scale component 1 is uniform. The material of the board | substrate 4 should just have electroconductivity, for example, a white (NS), copper (Cu), steel materials etc. are employable. Alternatively, the substrate 4 may be a surface of a non-conductive material that has been subjected to a conductive film treatment. In the present embodiment, 0.12 mm thick white (NS) is used.

In step S <b> 2, as shown in FIG. 5A, a resist portion 5 is formed by applying a resist agent on the substrate 4.
The resist agent is composed of a non-conductive material, and an exposure and development type (positive type liquid resist; ultraviolet degradation type) is employed. For example, P-RM300PM manufactured by Tokyo Ohka Co., Ltd. can be employed.
And the resist part 5 is formed in the surface of the board | substrate 4 by methods, such as printing of a resist agent, coating, application | coating, a bar coater, a roll coater. The resist portion 5 forms an acid resistant, alkaline resistant, non-conductive layer on the surface of the substrate 4. Note that the thickness of the resist portion 5 is appropriately determined in consideration of the thickness of the scale component 1 and the like.

  In step S3, the resist portion 5 is pre-baked by heat-treating the resist portion 5 together with the substrate 4. Pre-baking is performed by heating and drying at 90 ° C. ± 5 ° C. for 40 minutes. By this pre-baking step, the resist portion 5 is stabilized and the adhesion with the substrate 4 is improved, and the peeling of the resist portion 5 from the substrate 4 is prevented. When the thickness of the resist portion 5 is 10 μm or more, the resist portion 5 having a predetermined thickness may be formed by repeating the resist agent coating and pre-baking a plurality of times.

  Next, in step S4, the substrate 4 and the mask 10 are aligned with respect to the pilot hole 41, and as shown in FIG. 5B, the resist portion 5 is covered with the mask 10 and exposed to ultraviolet rays. . A transparent pattern 101 having a shape substantially the same as the shape of the scale component 1 is formed on the mask 10, and ultraviolet light is irradiated only to the pattern 101 portion of the resist portion 5 by exposing the mask 10 to ultraviolet light with a light source (not shown). Pattern exposure is performed. By this pattern exposure, the shape of the pattern 101 is transferred to a portion irradiated with ultraviolet rays in the resist portion 5, and the portion is deteriorated. Here, when the scale component 1 is formed on the substrate 4, since the electroformed part protrudes from the resist portion 5 and is built up, the actual dimension is larger than the shape of the pattern 101.

In step S5, the exposed substrate 4 and resist portion 5 are developed and washed by a general method such as alkali development or a solvent method. Here, for example, a 2% aqueous solution of NaOH is used as the developer. The developer is desirably used under temperature control of 35 ° C. ± 5 ° C., and the developer can use a shower type, a stirrer, or the like. As a result, as shown in FIG. 5C, the resist portion 5 corresponding to the pattern 101 is removed on the substrate 4 to form an electroformed forming portion 51 having the shape of the pattern 101. The substrate 4 is exposed in the region inside the electroformed forming portion 51.
In this way, a plurality of dial scale forming portions 42 in which the electroformed forming portions 51 are formed for all scale parts 1 around the dial plate 91 are formed on the substrate 4 as shown in FIG. Is done. In the present embodiment, 20 dial scale forming portions 42 are formed on one substrate 4.

  In step S <b> 6, the resist portion 5 is subjected to an after baking process, and the resist portion 5 is baked and fixed to the substrate 4. Thereby, the adhesiveness of the resist part 5 and the board | substrate 4 can be improved.

  In step S7, an insulating film for preventing plating adhesion is attached to the surface of the substrate 4 opposite to the resist portion 5. Moreover, in order to prevent the board | substrate 4 and the resist part 5 from being damaged by the next board | substrate deformation | transformation process, a protective film is affixed on the surface at the side of the resist part 5 of the board | substrate 4. FIG.

  In the substrate deformation process, in step S8, with the film stuck on the substrate 4, as shown in FIG. 7, a circular dent 421 and a circular shape are formed at the center of each dial scale forming portion 42 of the substrate 4. Twelve slit-like dents 422 extending radially from the dent 421 are formed through the substrate 4 by pressing. By forming each of these dents 421 and 422, it is possible to absorb the distortion of the substrate 4 that is caused by the deformation of the substrate 4 during the subsequent press working. In the present embodiment, the processing of each of the dents 421 and 422 is simultaneously performed on the entire substrate 4, but may be performed individually for each dial scale forming portion 42. When individually processing, each positioning pilot hole 41 is required. In this case, when processing pilot hole 41 in step S1, pilot hole 41 is formed for each dial scale forming portion 42. For example, 42 holes may be formed in the entire substrate 4.

In step S9, as shown in FIG. 8, which is a cross-sectional view taken along the line VIII-VIII of FIG. 7, the dial 91 is attached to each dial scale forming portion 42 by pressing using a press machine or the like. The shape of the substrate 4 is deformed so as to match the shape of the surface 91A.
And in step S10, the protective film affixed on the board | substrate 4 is peeled and the pattern on the board | substrate 4 is exposed.

  In the electroforming process, the scale component 1 is formed as shown in FIG. 9 by performing electroforming in step S11. At this time, it is necessary to ensure the conductivity of the substrate 4 and to make the scale component 1 formed by electroforming easy to peel from the substrate 4. Therefore, before performing the electroforming process, the substrate 4 is preliminarily subjected to degreasing, alkali cleaning, acid neutralization activation treatment, and passivation treatment for forming a passive film by immersing in a sodium sulfide aqueous solution. Thereafter, the scale component 1 is formed on the substrate 4 in the electroforming tank.

  Electroforming is performed under general electroforming conditions. The electroforming liquid materials are, for example, nickel sulfate (powder) 300 ± 20 g / liter, nickel chloride (powder) 50 ± 5 g / liter, boric acid (powder) 45 ± 5 g / liter, and the surface tension of scale part 1 is reduced. Then, brightener # 61 (liquid) 6 ± 1 milliliter / liter for reducing the electroforming stress of the scale part 1 and brightener # 62 (liquid) for giving the gloss of the scale part 1 surface as appropriate and scale part The brightening agent # 63 (liquid) 18 ± 3 ml / liter is used to increase the surface tension of 1 to form the scale part 1 in a mushroom shape, and these materials are dissolved in 250 liters of pure water. To produce an electroforming solution. The electroforming liquid is desirably managed at 55 ° C.

  And by this electroforming process, the electroforming liquid is filled in the region inside the electroforming forming part 51 on the substrate 4 and protrudes to the upper surface of the resist part 5 on the outer periphery of the electroforming forming part 51 to form a build-up. Is done. Here, when the scale component 1 having a predetermined thickness dimension is formed, it is preferable to form electroforming at a low potential for a long time. This is because, when the scale component 1 is formed in a high potential for a short time, the current density varies between the peripheral portion and the central portion of the scale component 1, and the peripheral portion may be formed into a raised shape, or the shape collapses. This is because there is a risk of it happening. In this embodiment, in order to form the scale component 1 having a thickness of 30 μm, electroforming is performed for 90 minutes at a current value of 3A.

  By this electroforming process, the scale component 1 is formed, the decorative surface 2 is formed by the portion formed on the surface on the side opposite to the substrate 4, and the pasting surface 3 by the portion in close contact with the substrate 4. Is formed.

In the surface plating step, flash plating is performed on the decorative surface 2 with, for example, gold or the like in step S12 to form a plating layer 6 on the decorative surface 2 as shown in FIG.
The scale component 1 is formed and manufactured on the substrate 4 by the above manufacturing process.

  In the transfer process, in step S13, the transfer sheet 7 is attached to the scale component 1 and the substrate 4 as shown in FIG. An adhesive (not shown) is applied to the transfer sheet 7 on the surface that is in close contact with the scale component 1, and is adhered to the scale component 1 with an appropriate adhesive force. The material of the transfer sheet 7 may be any material that can be easily peeled off and adhered to the scale component 1. For example, a soft film such as polyethylene or polypropylene can be used. For example, Nitto Denko Corporation Made of SPV film J-300 can be used. According to such a transfer sheet 7, when the scale component 1 is peeled from the substrate 4, the scale component 1 is held with an appropriate adhesive force. Further, for example, when a plurality of scale parts 1 are transferred by one transfer sheet 7, the layout of the plurality of scale parts 1 can be maintained as it is after the scale parts 1 are peeled off. Further, as a material of the transfer sheet 7, a transparent film-like material may be used so that the scale component 1 can be visually recognized through the transfer sheet 7, or in order to prevent the adhesive of the transfer sheet 7 from being dried. May be used.

  After sticking the transfer sheet 7 to the scale component 1 and the substrate 4, the scale component 1 and the substrate 4 are easily peeled off by performing roller tension in step S14. In step S15, as shown in FIG. 11B, the substrate 4 is peeled off from the scale component 1, and the scale component 1 is transferred to the transfer sheet 7. At this time, it is desirable that the fixing force between the substrate 4 and the scale component 1 is set to be weaker than the adhesive force between the scale component 1 and the transfer sheet 7. According to such setting, the scale component 1 is transferred from the substrate 4 to the transfer sheet 7 as the transfer sheet 7 is peeled off. The transfer sheet 7 serves to protect the decorative surface 2 and the plating layer 6 of the scale component 1 in addition to the role of peeling the scale component 1 from the substrate 4.

  In step S16, as shown in FIG. 12, in the adhesive application step, as shown in FIG. Is applied to form an adhesive layer. In this case, the pressure-sensitive adhesive 8 is, for example, an aqueous pressure-sensitive adhesive (for example, F-1040B acrylic elastomer resin manufactured by Tesque Co., Ltd., antifoaming agent, ion-exchanged water, methanol, and polyvinyl methyl ether (thickener). It can be used at a blending ratio) and can be applied with a screen printer, and is preferably formed with a thickness of about 10 μm.

  When the scale component 1 is not immediately attached to the dial 91, a release sheet is applied to the surface to which the adhesive 8 is applied to form a sheet-like seal, and the sheet-like seal is stored. May be. Here, the material of the release sheet is preferably non-breathable and has good releasability from the pressure-sensitive adhesive 8, for example, a paper having a surface treated with a fluorine-based resin, a resin film, or the like. For example, SP-8E ivory manufactured by Lintec Corporation, thickness t = 0.11 can be employed. The release sheet protects the pressure-sensitive adhesive 8 and prevents adhesion of dust to the pressure-sensitive adhesive 8 and evaporation of the solvent and moisture of the pressure-sensitive adhesive 8. In addition, since the scale component 1 will stick to a peeling sheet if peeling ability is weak, moderate peeling performance is requested | required.

  In the pasting step, the scale component 1 is pasted at a predetermined position on the pasted surface 91A of the dial 91 in step S17. First, in order to improve the adhesion between the dial 91 and the scale component 1, dirt on the dial 91 is previously removed by washing (ultrasonic cleaning, acid cleaning, or the like).

  Next, the dial 91 and the scale component 1 are positioned. These positioning may be performed by, for example, a jig for fixing the dial 91 and an electroforming portion for positioning formed on the scale component 1 side. That is, first, the dial 91 is fixed to an appropriate jig. This jig is provided with positioning pins for positioning the scale component 1 with respect to the dial 91. On the other hand, on the scale part 1 side, an electroformed part for positioning is formed around the scale part 1 simultaneously with the forming process of the scale part 1, and the electroformed part for positioning together with the scale part 1 is transferred to the transfer sheet 7. Transfer it to The scale component 1 is positioned with respect to the dial 91 by engaging the positioning electroformed part with the positioning pin of the jig to which the dial 91 is fixed.

  After the scale component 1 is arranged at a predetermined position on the dial 91, the scale component 1 is pasted on the surface 91A to be pasted of the dial 91 as shown in FIG. Then, the scale component 1 is pressed by a roller or the like from above the transfer sheet 7 in order to ensure that the scale component 1 is in close contact with the dial 91.

  Then, as shown in FIG. 13B, the transfer sheet 7 is peeled off. At this time, since the scale component 1 is pressed and is in close contact with the dial plate 91, when the transfer sheet 7 is peeled off while holding the scale component 1, the scale component 1 remains adhered to the dial plate 91. On the other hand, the adhesive 81 in the portion without the scale component 1 is adhered to the transfer sheet 7 and peeled off together. That is, in this case, it is desirable that the adhesive force between the transfer sheet 7 and the pressure-sensitive adhesive 8 is set stronger than the adhesive force between the pressure-sensitive adhesive 8 and the dial 91. Further, it is desirable that the adhesive force between the pressure-sensitive adhesive 8 and the dial 91 is set to be stronger than the adhesive force between the scale component 1 and the transfer sheet 7. Under such conditions, the pressure-sensitive adhesive 8 where the scale component 1 is not disposed is peeled off together with the transfer sheet 7. Even if it is difficult to satisfy such a condition, the scale sheet 1 is left on the dial 91 by peeling off the transfer sheet 7 while holding the scale part 1, and the other adhesive 81 together with the transfer sheet 7 can be easily obtained. Can be peeled off.

  As shown in FIG. 2, the scale component 1 is pasted at a predetermined position on the pasting surface 91 </ b> A of the dial 91 by the above process.

According to such an embodiment, the following effects are obtained.
(1) In the substrate deformation step, the substrate 4 is deformed in accordance with the shape of the attachment surface 91A of the dial 91, and in the electroforming step, the scale is formed in order to perform electroforming on such a substrate 4 The shape of the pasting surface 3 of the component 1 is the same as the shape of the pasting surface 91 </ b> A of the dial 91. Thereby, the scale component 1 related to the shape of the to-be-pasted surface 91A of the dial 91 can be stuck and stuck to the dial 91, and the scale component 1 can be prevented from being detached from the dial 91. Can do. This is particularly effective when a long component such as the scale component 1 of the timepiece 90 is pasted on the curved surface so that the longitudinal direction thereof is along the curved direction of the curved surface.

(2) In the substrate deformation process, before the shape of the substrate 4 is deformed, the dents 421 and 422 are formed on the substrate. Therefore, the distortion of the substrate 4 caused by the deformation of the substrate 4 at the time of subsequent press working. Can be absorbed. Thereby, distortion does not generate | occur | produce in the exposed part of the board | substrate 4 in the electroforming formation part 51, but the shape of the sticking surface 3 of the scale component 1 can be match | combined with the shape of 91 A of to-be-pasted surfaces of the dial 91. Therefore, the scale component 1 can be stuck and pasted to the dial 91, and the scale component 1 can be prevented from being detached from the dial 91.

Note that the present invention is not limited to the above-described embodiment, and includes the following modifications as long as the object of the present invention can be achieved.
That is, in the said embodiment, although the example which fixes the scale component 1 as an electroformed component of this invention to the dial 91 of the timepiece 90 was shown, it is not restricted to this. For example, it may be used as an electroformed part attached to a decorative part such as an accessory, a craft, or an interior.

Moreover, although the scale component 1 in the said embodiment showed the example formed in the character type, it is not restricted to this, For example, what imitated a pattern etc. may be used.
Furthermore, although the said embodiment showed the example which deform | transformed the board | substrate 4 into the curved surface shape according to the shape of 91 A of to-be-pasted surfaces of the dial 91, it is not restricted to this. That is, it is included in the present invention if the substrate 4 is deformed in accordance with the shape of the base material to be attached, for example, the step provided on the base material to be attached surface or the shape of the partial protrusion. The substrate 4 may be deformed according to the above.

  Moreover, in the said embodiment, although the example which forms the surface plating layer 6 in the decorative surface 2 of the scale component 1 was shown, it is good also as a structure by which the surface plating layer 6 is not formed. In this case, a design in which the surface of the decorative surface 2 is exposed can be provided. Further, the surface on the decorative surface 2 may be decorated with, for example, electrodeposition coating or ink, and by doing so, it is possible to deal with various designs.

  The best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.

  Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

The figure which shows the timepiece concerning one Embodiment of this invention. Sectional drawing which shows the scale component concerning this embodiment. The flowchart which shows the manufacturing method of scale components. The figure which shows the resist formation process of scale components. Another figure which shows the resist formation process of scale components. The figure which shows the base material in which the dial scale formation part was formed. Enlarged view of the dial scale forming part of FIG. The figure which shows the board | substrate deformation | transformation process of a scale component. The figure which shows the electroforming process of scale parts. The figure which shows the surface plating process of scale components. The figure which shows the transcription | transfer process of scale components. The figure which shows the adhesive application process of a scale component. The figure which shows the sticking process of scale components.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Scale parts as electroformed parts, 2 ... Decoration surface, 3 ... Pasting surface, 4 ... Substrate, 5 ... Resist part, 90 ... Clock, 91 ... Dial as base material, 91A ... Surface to be pasted.

Claims (4)

A method for producing an electroformed part, comprising:
A resist part forming step of forming a resist part on the substrate;
A substrate deformation step in which the substrate is deformed in accordance with the shape of the base surface to be pasted in a state where the resist portion is formed on the substrate; and
An electroforming step of forming the electroformed part by electroforming on the deformed substrate using the resist portion;
A method for producing an electroformed part, comprising: In the manufacturing method of the electroformed component of Claim 1,
In the substrate deformation step, before the substrate is deformed, a penetrating nigga for preventing distortion of the substrate due to the deformation is formed in the substrate.   An electroformed part produced by the method for producing an electroformed part according to claim 1.   A timepiece comprising the electroformed component according to claim 3.

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