JP2008098014A - Manufacturing method of sheet with metal-tone decorating resin molding, and sheet with metal-tone decorating resin molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet with a metal-tone decorating resin molding and its manufacturing method having an attractive appearance without contact traces of cathode terminals or cut-off traces of resin runners, as well as a sheet with a metal-tone decorating resin molding and its manufacturing method which can be simply manufactured as a fastening property between the metal-tone decorating resin molding and a plastic sheet is strong. <P>SOLUTION: A base layer 8 and a key top part 7a can be covered with an electroless plating layer 9a integrally spread from the surface of the base layer 8 over to the surface of the key top part 7a. Therefore, formation of an electrolytic plating layer 9b on the surface of the key top part 7a can be carried out by electric conduction through the base layer 8, so that a metal plating layer 9 of excellent appearance can be formed at the key top part 7a without any contact traces or cut-off traces. Moreover, if the base layer 8 is formed on a plastic sheet 6 in printing, and a resin molding 7c of the same material as the base layer 8 is formed, a fastening property of the resin molding 7c to the plastic sheet 6 can be made stronger. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sheet with a metallic decorative resin molded body used as an operation key sheet or the like in various electronic devices such as a mobile phone, a PDA, a remote controller, a digital camera, an AV device, an in-vehicle electrical device, and the like, and a manufacturing method thereof.

Various electronic devices such as mobile phones and AV devices are provided with various exterior parts such as operation key sheets and housings of these devices. Such exterior parts are often formed of resin, and the surface of the molded body is decorated with additions such as addition of letters, designs, and various color tones. This decoration is composed of a polymer coating layer by printing or the like, and may be composed of a metal layer by plating or vapor deposition. Of these, exterior parts decorated with metal layers are used in many electronic devices because they can produce a high-class feeling. For example, a key top for a pushbutton switch is decorated by forming a key top body with ABS (acrylonitrile butadiene styrene) resin and applying a metal layer by wet plating on the surface of the key top body. Such examples are described in Japanese Patent Application Laid-Open No. 2003-1000017 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2005-209593 (Patent Document 2).
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The metal layer by such a wet plating process is manufactured as follows. First, an electroless plating process is performed on the key top body, and an electroless plating layer is formed on the surface of the key top body. Next, the electroless plating layer is energized to perform an electroplating process, and an electroplating layer is laminated on the surface of the electroless plating layer. Here, there are two energization methods in the electroplating process for forming the outer plating layer. The first method is a method in which a cathode terminal is brought into contact with an electroless plating layer formed on the surface of the key top body and energized. The second method is a method in which a cathode terminal is attached to a resin runner that is connected to the key top body. It is a method of energizing by contact.
Japanese Patent Laid-Open No. 2003-1000017 Japanese Patent Laid-Open No. 2005-209593

  By the way, the above two methods have the following problems. In the first method, since the electrolytic plating layer is not formed at the contact portion with the cathode terminal, the trace of contact with the cathode terminal remains on the key top body. In the second method, as shown in FIG. 15, the resin runner 1 having a thickness of 0.2 mm or more after the electrolytic plating treatment is cut from the key top body 2a with the cutting blade 10 (FIG. 15A). A cut mark 4 of the resin runner remains on the obtained key top 2 (FIG. 15B). Further, in cutting the resin runner 1, the metal layer 3 in the vicinity of the cut portion may be peeled off from the key top 2 due to an impact at the time of cutting.

  The key tops 2 obtained by the first method and the second method are bonded to a rubber sheet (not shown) one by one with an adhesive to produce a key sheet with a key top for a push button switch. Therefore, the positioning of each key top 2 is troublesome, and the fixing force between the key top 2 and the rubber sheet may be insufficient.

  The present invention has been made against the background of the prior art as described above. That is, the objective of this invention is providing the sheet | seat with a metal tone decoration resin molding which has neither the trace of contact with a cathode terminal nor the cutting trace of a resin runner, and a good-looking external appearance, and its manufacturing method.

  Another object of the present invention is that the metal-decorated resin molded body and the plastic sheet of the sheet with the metal-decorated resin molded body in which the metal-decorated resin molded body is fixed to the plastic sheet are strong and easy. It is providing the sheet | seat with a metal tone decoration resin molded object which can be manufactured, and its manufacturing method.

  In order to achieve the above object, the present invention is configured as follows.

  The present invention provides a sheet with a metal-decorated resin molded body in which a plurality of resin-molded bodies decorated with a metallic tone are fixed on a plastic sheet, and the plastic sheet forms a connecting portion of the resin molded body. A method of applying a base layer to be a conductive path on a plastic base sheet with a resin liquid to which metal plating adheres, and contacting the base layer with a molten resin to which metal plating adheres A step of providing a resin molded body on the base sheet, a step of performing wet plating to form a metal plating layer on the surface of the base layer and the resin molded body, and leaving the connecting portion and the resin molded body, And a step of cutting and removing the excess base material sheet on which the metal is formed, and a method for producing a sheet with a metallic decorative resin molded body.

  Applying and forming a base layer to be a conductive path on a plastic substrate sheet with a resin solution to which metal plating adheres, and a resin molded body in contact with the base layer with molten resin to which metal plating adheres In order to perform the step of providing on the material sheet, the molded bodies can be provided with a plurality of resin molded bodies formed away from each other, and a conductive path that conducts them can be provided. A metal plating layer that is integrally connected from the surface of the base layer to the surface of the resin molded body can be formed by energizing using the material. Therefore, there is no need to contact the cathode terminal on the resin molded body as in the prior art, and there is no need to energize using a resin runner, and clean electrolytic plating that leaves no trace of contact or cutting on the surface of the resin molded body. A layer can be formed. In addition, with this resin solution, a contact contact portion for attaching a cathode terminal during the electroplating process can be formed as a conductive end separately from the conductive path.

  This invention can perform the process of apply | coating and forming a base layer by a printing process about the manufacturing method of the said sheet | seat with a metallic tone decoration resin molding. A printing process using a printing plate can accurately provide a coating shape and a coating thickness, and can improve the coating efficiency as compared with a coating process in which paint is dispersed and sprayed.

  Further, the surface of the plastic base sheet can be roughened by the solvent contained in the base layer ink, and the adhesion between the base sheet and the base layer can be increased. Furthermore, the underlayer formed by printing can be formed in a uniformly dispersed state because the flow orientation of the polymer domain component can be made smaller than that of a resin molded body that is melted and solidified by injection molding. Therefore, when electroless plating is applied to the surface of the underlayer, the uneven surface that imparts the anchor effect can be formed uniformly, and the adhesion with the electroless plating layer is improved compared to the case where the underlayer is formed by fusion bonding. Can be increased. Therefore, even if it is a thin layer, it can be set as the base layer to which electroless plating adheres well.

  The step of providing the resin molded body on the base sheet can be a process of inserting the base sheet into an injection mold, injecting the molten resin, and integrally molding the base sheet and the resin molded body. The process of providing the resin molded body on the base sheet is a process of inserting the base sheet into an injection mold and injecting the molten resin to integrally mold the base sheet and the resin molded body. The molded body can be fused. Therefore, it is possible to increase the adhesion between the resin molded body and the base layer. In addition, the contact contact part which connects to a conductive path and attaches a cathode terminal in the case of an electrolytic plating process can be formed as a conductive end with this molten resin.

  The step of performing wet plating can be a step of performing electrolytic plating. Since the step of performing wet plating is the step of performing electrolytic plating, the metal plating layer can be formed from a metal that can be used in electrolytic plating, and thus a metal plating layer having a clean surface can be obtained. Moreover, if electroless plating is not performed in advance, the number of steps can be reduced.

  The step of performing wet plating can be a step of performing electroplating after performing electroless plating. Since the electroplating is performed after the electroless plating is performed in the wet plating process, the resin molded body and the base layer can be formed of a resin to which the electroless plating is adhered, Since it is not necessary to use a high resin, the range of resin selection is expanded.

  The base layer can be formed by including the resin component forming the resin molded body as the resin component forming the base layer. Since the base layer is formed by including the resin component forming the resin molded body as the resin component forming the base layer, it is possible to increase the adhesion between the base layer and the resin molded body. Therefore, the resin molding can be firmly fixed to the base sheet.

  In addition, an outer peripheral frame can be provided on the base sheet in order to prevent the base sheet from shaking when wet plating is performed. If the outer peripheral frame is provided, it is difficult to bend the base sheet due to its rigidity, and even if the plating solution flows during the wet plating process, the base sheet can be prevented from shaking, and the metal plating layer having a uniform layer thickness Can be formed.

  And this invention is a sheet | seat with a metal tone decoration resin molding by which the some resin molding to which the decoration of the metal tone was made adheres on a plastic sheet, and the plastic sheet forms the connection part of a resin molding. The resin molded body has a base printed layer to which metal plating adheres between the resin molded body and the plastic sheet, and the resin molded body is a solidified body in which the resin to which metal plating adheres is fused to the base layer. Provided is a sheet with a metallic decorative resin molded body in which the exposed surfaces of the body and the base layer are covered with a metal plating layer.

  A resin-molded sheet with a metal-decorated resin molded body in which a plurality of resin-molded bodies with metal-like decoration are fixed on a plastic sheet, and the plastic sheet forms a connecting portion of the resin-molded body. There is a base printed layer to which metal plating adheres between the body and the plastic sheet, and the resin molded body is a solidified body in which the resin to which metal plating adheres is fused to the base printed layer. Since each of the exposed surfaces was a sheet with a metallic decorative resin molded body covered with a metal plating layer, the contact traces where the cathode terminal was brought into contact with the metallic decorative resin molded body and the resin runner were excised. It is a sheet with a metallic decorative resin molded body that is cleanly covered with a metal plating layer with no cut marks.

  In addition, since the underprint layer formed by printing can accurately set the application shape and the application thickness, the contact between the underprint layer and the resin molded body is ensured, and the surface of the underprint layer The metal plating layer that is integrally connected to the surface of the resin molded body is formed without any unevenness. In addition, the adhesive strength between the metallic decorative resin molded body and the plastic sheet is strong, and the metallic decorative resin molded body is unlikely to be detached from the plastic sheet.

  In this sheet with a metallic decorative resin molded body, the metal plating layer can be an electrolytic plating layer. Since the metal plating layer is an electrolytic plating layer, a sheet with a metallic decorative resin molded body having a clean metal plating layer covered with a metal that can be used in an electrolytic plating process can be obtained. In addition, if it is not necessary to perform electroless plating in advance, the number of steps can be reduced, and manufacturing can be performed easily.

  Alternatively, the metal plating layer can be a laminate of an electroless plating layer and an electrolytic plating layer. Since the metal plating layer is a laminate of an electroless plating layer and an electroplating layer, electroless plating can be performed without using a resin with high conductivity enough to adhere the electroplating to the resin molding or the resin for the underlayer. Adhesive resin can be used, and the range of resin selection is expanded. Moreover, since electroless plating is covered with electrolytic plating, it is possible to express metallic decoration that cannot be expressed by electroless plating.

  The foundation layer has a thickness of 5 μm to 100 μm. When the electroless plating layer is provided, if the thickness of the underlayer is less than 5 μm, it is difficult to form an uneven surface that gives an anchor effect for electroless plating on the resin molded body, and sufficient adhesion of the electroless plating layer is achieved. Sex cannot be obtained. Moreover, when providing an electroplating layer directly, without providing an electroless-plating layer, sufficient electric current cannot be passed and it is difficult to form an electroplating layer. If the thickness of the underlayer exceeds 100 μm, it takes time to form the underlayer and the manufacturing cost increases. Further, since the rigidity of the underlayer is increased, there is a possibility that the metal plating layer may be peeled off by an impact at the time of cutting when an unnecessary base material sheet with the underlayer is cut and removed.

  The base layer can be formed by including the resin component forming the resin molded body as the resin component forming the base layer. Therefore, it is possible to increase the adhesion between the base layer and the resin molded body. Therefore, it is a sheet | seat with a metal tone decoration resin molding to which the metal tone decoration resin molding was firmly fixed with respect to the plastic sheet.

  Such a sheet with a metallic decorative resin molded body can be used as an operation key sheet used in a digital still camera or a mobile phone, and the metallic decorative resin molded body can be used as an operation button. In this sheet with a metallic decorative resin molded body, the metallic decorative resin molded body is connected by a plastic sheet, so each metallic decorative resin molded body can correspond to each operation button. , Many operation buttons can be installed with a sheet with a metallic decorative resin molded body, and assembly is easy. Moreover, the height of the metallic decorative resin molded product can be freely designed, and the device can be made thinner. In addition, since the metallic decorative resin molded body and the plastic sheet are fixed to each other through a predetermined underlayer, the adhesive strength between the metallic decorative resin molded body and the plastic sheet is strong. It is possible to provide an operation button that does not have a flange that functions to prevent it from coming off, and the operation key sheet can be further reduced in thickness. And since the beautiful metal plating layer which does not leave a contact trace and a cutting trace on the surface of an operation button is formed, it can apply to a high quality apparatus.

  Furthermore, the sheet with the metallic decorative resin molded body can be structured such that the resin molded body is fixed so as to sandwich the front and back sides of the plastic sheet through the through holes of the plastic sheet. With such a structure, the plastic sheet and the metallic decorative resin molded body can be more firmly fixed.

  According to the method for producing a sheet with a metallic decorative resin molded body of the present invention, a plurality of metallic decorative resin molded bodies covered with an electroplated layer having a clean appearance without any contact mark or cutting trace is a plastic sheet. It is possible to obtain a sheet with a metallic decorative resin molded body connected in the above. Moreover, the adhering force between the metallic decorative resin molding and the plastic sheet is strong. Furthermore, according to the manufacturing method of the sheet | seat with a metal tone decoration resin molding of this invention, the sheet | seat with a metal tone decoration resin molding can be manufactured easily.

  According to the sheet with a metallic decorative resin molded body of the present invention, the surface has a beautiful metallic decorative resin molded body with no appearance of contact marks or cut marks, and a plurality of the metallic decorative resin molded bodies. The pieces are connected by a plastic sheet, and the metallic decorative resin molded body and the plastic sheet are firmly fixed. Therefore, it is suitably used as a digital still camera having a plurality of operation buttons and an operation key sheet of a mobile phone.

  Hereinafter, examples of embodiments of the present invention will be described with reference to the drawings. In addition, about the structure which is common in each embodiment, the same code | symbol is attached | subjected and duplication description is abbreviate | omitted.

  In the following embodiments, an example will be described in which “a sheet with a metallic decorative resin molded body” is applied as an operation key sheet provided in a digital still camera. However, this operation key sheet can be applied not only to a digital still camera but also to a mobile phone. Furthermore, the sheet | seat with a metal tone decoration resin molding of this invention is applicable also as a housing | casing (exterior case) of an apparatus, and other decorative parts.

First Embodiment [FIGS. 1 to 7] : FIG. 1 is a rear perspective view of a digital still camera to which the operation key sheet 5 of the first embodiment is applied, and FIG. 2 is a plan view of the operation key sheet 5. 3 is a sectional view taken along the line SA-SA in FIG. 2, and FIGS. 4 to 7 are a plan view and a sectional view in the manufacturing process of the operation key sheet 5, respectively. As shown in FIG. 2, the operation key sheet 5 includes a plastic sheet 6 and a metallic decorative resin molded body 7, and a base layer 8 is formed on the surface of the bottom of the metallic decorative resin molded body 7. 1 has a structure in which a metal plating layer 9 is formed, and as shown in FIG. 1, the metallic decorative resin molded body 7 is mounted as an operation button so as to be exposed on the surface of the digital still camera. is there.

  The members constituting the operation key sheet 5 will be described. The plastic sheet 6 forms a connecting portion 6c that connects a plurality of metallic decorative resin molded bodies 7, and has an outer edge and an inner edge formed in an annular shape having a substantially rectangular shape in plan view. Has been. And each metallic decoration resin molding 7 used as an operation button is formed with the flexible thin resin film so that it may be operated independently. As the material, it is necessary to be a resin that is not attacked in the metal plating process, and in addition to polyethylene terephthalate resin, polycarbonate resin, polyester resin, polyvinyl chloride resin, polyvinylidene chloride resin, polypropylene resin, polyethylene resin, polystyrene resin, An acrylic resin or the like can be used. The thickness of the plastic sheet 6 may be various depending on the application. However, when the plastic sheet 6 does not have rigidity, the thickness is preferably about 6 μm to 200 μm. , 300 μm or more.

  The metallic decorative resin molded body 7 is a member that functions as an operation button in the operation key sheet 5, and four separate metallic decorative resin molded bodies 7 are connected in a ring shape with the plastic sheet 6. Each metallic decorative resin molded body 7 is fixed to the plastic sheet 6 and penetrates the through hole 6 a of the plastic sheet 6 to form a pusher portion 7 b on the back side of the plastic sheet 6. The upper surface and the side surface of the metallic decorative resin molded body 7 are plated with metal and have a metallic color tone. These surfaces may be provided with characters and symbols. The key top portion 7a on the surface side of the plastic sheet 6 is formed in a rectangular shape in plan view.

  Resin to which the metal plating layer adheres can be used for the resin molded body 7c to which the metal plating layer is attached and becomes the metal-tone decorative resin molded body 7, and specifically, a resin to which electroless plating is adhered, or electrolysis A resin to which plating adheres can be used. Resins that can form an electroless plating layer by adhesion of electroless plating are, for example, ABS resin, polypropylene resin, polyphenylene oxide resin, polyacetal resin, polyamide resin, polysulfone resin, alloy resin containing these, or modified Resin etc. are mentioned. Resins that can form an electroplating layer by adhering electrolytic plating are, for example, conductive resins in which conductive particles such as carbon, metal, and metal oxide are dispersed in an insulating resin, or polythiophene, polyaniline, polyacene, Examples thereof include conductive polymer resins such as polypyrrole.

  The underlayer 8 is applied and formed on the front surface side of the plastic sheet 6, and the back surface of the metallic decorative resin molded body 7 is fixed to the plastic sheet 6. The resin component that forms the base layer 8 preferably includes a resin component that forms the resin molded body 7c, and the resin that forms the base layer 8 and the resin that forms the resin molded body 7c are more preferably the same. Here, the “resin component” refers to at least one resin in the case where the resin forming the metallic decorative resin molded body 7 or the base layer 8 is a mixture of a plurality of types of resins, and the resins include a plurality of types of resins. When a block copolymer resin is included regardless of whether it is a resin mixture or a single resin, a part of the block portion is meant. This is because the adhesion between the metallic decorative resin molded body 7 and the base layer 8 is increased. Specifically, the resin forming the base layer 8 can be a resin to which electroless plating is attached or a resin to which electrolytic plating is attached. Resins that can form an electroless plating layer by adhesion of electroless plating are, for example, ABS resin, polypropylene resin, polyphenylene oxide resin, polyacetal resin, polyamide resin, polysulfone resin, alloy resin containing these, or modified Resin etc. are mentioned. Resins that can form an electroplating layer by adhering electrolytic plating are, for example, conductive resins in which conductive particles such as carbon, metal, and metal oxide are dispersed in an insulating resin, or polythiophene, polyaniline, polyacene, Examples thereof include conductive polymer resins such as polypyrrole. The thickness of the underlayer 8 is preferably 5 μm to 100 μm, and more preferably 10 μm to 50 μm.

  The metal plating layer 9 is a metal plating layer formed by wet plating, and is formed on the resin molded body 7c and the base layer 8 exposed on the surface of the operation key sheet before plating. The metal plating layer 9 can be a layer formed of a laminate of an electroless plating layer and an electrolytic plating layer, or can be a layer formed of an electrolytic plating layer alone. However, in the case of laminating an electroless plating layer and an electroplating layer, the resin molded body 7c needs to be a resin to which electroless plating adheres, and in the case of a single electroplating layer, the resin molded body 7c is It is necessary to be a highly conductive resin to which electrolytic plating adheres. The metal constituting the metal plating layer 9 is a metal that can be used in a wet plating process. In electroless plating, nickel, nickel alloy, gold, silver, copper, cobalt, and the like can be used. In addition to chromium, gold, silver, copper, nickel, rhodium, platinum, zinc, alloys (tin-copper alloy, tin-cobalt alloy, tin-nickel alloy), and the like can be used.

  A method for manufacturing the operation key sheet 5 will be described. First, as shown in FIG. 4, four through holes 6 a are formed in a base material sheet 6 b that becomes a plastic sheet 6. Next, as shown in FIG. 5, the base layer 8 which becomes a conductive path is formed on the surface of the base material sheet 6b by printing. Although various printing methods can be adopted for printing, it is preferable to print printing ink containing a resin solution obtained by dissolving the resin forming the base layer 8 with a solvent. The base layer 8 obtained by printing becomes the base print layer 8. The base layer (or “base print layer”) 8 includes a fixed portion 8b having the same shape as the back surface of the key top portion 7a, a path portion 8c for forming a conductive path in the electrolytic plating process, and a cathode terminal in the electrolytic plating process. A contact contact portion 8d to be attached is provided. After the base layer 8 is printed, the base material sheet 6b is inserted into an injection mold, and a molten resin is injected from the back surface side to the front surface side of the base material sheet 6b through the through holes 6a to form the resin molded body 7. . Thus, as shown in FIG. 6, four resin molded bodies 7 having a key top portion 7a and a presser portion 7b and arranged in an annular shape are formed.

  Next, the metal plating layer 9 is formed on the base sheet 6b on which the resin molded body 7c and the base layer 8 are formed. When the metal plating layer 9 is a laminate of an electroless plating layer and an electrolytic plating layer, the surface of the resin molded body 7c and the base layer 8 is first subjected to etching treatment or catalyst treatment, and then the base sheet 6b is electrolessly plated. The electroless plating layer 9a is formed on the surfaces of the resin molded body 7c and the base layer 8 by dipping in an aqueous solution for treatment. Thereafter, a cathode terminal is connected to the contact contact portion 8d and immersed in an aqueous solution for electrolytic plating treatment, and the electroless plating layer 9a is energized to form the electrolytic plating layer 9b. On the other hand, when the metal plating layer 9 is a single layer of an electrolytic plating layer, a cathode terminal is connected to the contact contact portion 8d, the base sheet 6b is immersed in an aqueous solution for electrolytic plating treatment, and the electrolytic plating layer is energized. 9b is formed. In this way, the metal plating layer 9 is attached to the resin molded body 7 c to obtain a metal-like decorative resin molded body 7. After the metal plating layer 9 is formed, the cut blade 10 is applied as shown in FIG. 7B to cut the broken line portion shown in FIG. The excess base material sheet 6b including the path portion 8c and the contact point contact portion 8d is cut and removed, leaving a portion that becomes the connecting portion 6c in 6b. In this way, the operation key sheet 5 of this embodiment is obtained.

  According to the operation key sheet 5 for forming the electroless plating layer 9a and the manufacturing method thereof, the base layer 8 and the key top portion are formed by the electroless plating layer 9a integrally connected from the surface of the base layer 8 to the surface of the key top portion 7a. 7a can be covered. Therefore, the formation of the electroplating layer 9b on the surface of the key top portion 7a can be performed by bringing the cathode terminal into contact with the contact contact portion 8d and energizing through the contact electrode portion 8d, the path portion 8c, and the fixing portion 8b. Further, according to the operation key sheet 5 and the manufacturing method thereof in which only the electroplating layer 9b is formed as the metal plating layer 9 without forming the electroless plating layer 9a, the conductive base layer 8 and the conductive keytop portion are formed. Since 7a is integrally connected, it is possible to form the electroplating layer 9b by energizing through the contact electrode portion 8d, the path portion 8c, and the fixing portion 8b by bringing the cathode terminal into contact with the contact contact portion 8d. Therefore, it is not necessary for both to contact the cathode terminal on the key top body 2 as in the prior art, and it is not necessary to energize using the resin runner 1. Therefore, the metal plating layer 9 having a beautiful appearance can be formed on the key top portion 7a without leaving any trace of contact or cutting.

  In the above process, since the base layer 8 is formed by printing on the base sheet 6b, the surface of the base sheet 6b can be roughened by the solvent contained in the paint, and the base sheet 6b and the base layer 8 can be roughened. It is possible to increase the adhesive strength. When the resin molded body 7c made of the same material that can be fused at the time of injection molding is formed on the base layer 8, the adhesion between the base layer 8 and the resin molded body 7c can be increased, and the base sheet 6b The fixing force of the resin molded body 7c can be further strengthened.

  Further, since the underlayer 8 is formed by printing, the flow orientation of the resin is small as compared with the case where the underlayer is formed by melt injection molding. Therefore, the underlayer 8 can be formed in a more uniformly dispersed state. Therefore, the adhesive force of the electroless plating layer 9a can be increased as compared with the case where the base layer is formed by melt injection molding.

  Since the underlayer 8 is a printing layer, the coating shape and coating thickness can be accurately provided. Forming an electroless plating layer 9a that can reliably contact the base layer 8 and the key top portion 7a because an accurate coating shape is formed, and is integrally connected from the surface of the base layer 8 to the surface of the key top portion 7a. Can do. Further, since the coating thickness is accurately controlled, the adhesion of the electroless plating layer 9a to the base layer 8 can be increased.

  In addition, since the resin molded body 7c passes through the through-hole 6a and sandwiches and fixes the plastic sheet 6 from the front and back surfaces, the plastic sheet 6 and the resin molded body 7c can be securely fixed.

Second Embodiment [FIGS. 8 to 10] : FIG. 8 is a plan view of the operation key sheet 11 of the second embodiment, FIG. 9 is a sectional view taken along the line SF-SF of FIG. 8, and FIG. The top view and sectional drawing in the manufacture process of the sheet | seat 11 are shown, respectively. As shown in FIGS. 9 and 10, the operation key sheet 11 of the second embodiment is different from the operation key sheet 5 of the first embodiment in that a base layer is formed in a portion corresponding to the fixing portion 8 b in the first embodiment. 13 is not formed, and the path portion 13c is slightly extended. In other words, when the resin molded body 12c indicated by the wavy line in FIG. 10 is formed, the road portion 13c is extended so that the outer edge of the back surface of the resin molded body 12c contacts the end portion of the road portion 13c. A base layer 13 is provided. The remaining configuration and the material of each part are the same as those of the operation key sheet 5 of the first embodiment.

  The manufacturing method of the operation key sheet 11 is also substantially the same as that of the operation key sheet 5 of the first embodiment, and is different in that the fixing portion having the same shape as the back surface shape of the key top portion 12a is formed when the base layer 13 is formed. Are formed, and the contact portion 13d for attaching the cathode terminal by electrolytic plating is formed. Further, the path portion 13c is formed so as to extend slightly to a portion corresponding to the fixing portion. By carrying out like this, the outer edge of the resin molding 12 can contact with the edge part of the path | route part 13c reliably by formation of the resin molding 12, and can aim at conduction | electrical_connection. Otherwise, the operation key sheet 11 of this embodiment is manufactured in the same manner as in the first embodiment.

  The operation key sheet 11 of the present embodiment can achieve the same effects as the operation key sheet 5 of the first embodiment. However, since the base layer corresponding to the fixing portion is not provided, the usage amount of the base layer 13 is reduced. Can be reduced. However, since the area where the resin molded body 12c and the plastic sheet 6 are in contact with each other via the underlayer 13 is reduced, the fixing force of the plastic sheet 6 and the metallic decorative resin molded body 7 in the operation key sheet 5 is more operational. It is stronger than the adhesive strength between the plastic sheet 6 and the metallic decorative resin molded body 12 in the key sheet 11.

Third Embodiment [FIGS. 11 to 13] : FIG. 11 is a plan view of the operation key sheet 15 of the third embodiment, FIG. 12 is a sectional view taken along the line SH-SH of FIG. 11, and FIG. The top view and sectional drawing in the manufacturing process of the sheet | seat 15 are shown, respectively. As shown in FIGS. 12 and 13, the operation key sheet 15 of the third embodiment is different from the operation key sheet 5 of the first embodiment in that a through hole 6 a is formed in the plastic sheet 6 in the first embodiment. On the other hand, in this embodiment, the through hole is not formed, and the pusher 19 separated from the key top portion 18a of the resin molded body 18c is formed on the back surface of the plastic sheet 16.

  The manufacturing method of the operation key sheet 15 of the present embodiment is the same as that of the first embodiment until the formation of the base layer 17 except that the base material sheet 16b having no through hole is used. Thereafter, the base sheet 16b is inserted into an injection mold of the resin molded body 18c, the molten resin is injected to the front side of the base sheet 16b, and the resin molded body 18 is fixed to the fixing portion 17b of the base layer 17. . Thereafter, the metal plating layer 9 is formed in the same manner as in the first embodiment, and the presser 19 coated with the same or different paint as the base layer 17 is fixedly formed on the back surface of the base material sheet 16b. Finally, the excess base sheet 16b is cut and removed, leaving the connecting portion 16c, as in the first embodiment, to obtain the operation key sheet 15 of the present embodiment.

  The operation key sheet 15 of the present embodiment can achieve the same effects as the operation key sheet 5 of the first embodiment, but the resin molded body 7c sandwiches the front and back surfaces of the plastic sheet 6 as in the first embodiment. Since the resin molded body 18c on the front surface side and the pusher 19 on the back surface side are separated with the plastic sheet 16 interposed therebetween, the plastic sheet 6 and the metallic decorative resin molded body 7 in the operation key sheet 5 are separated. Is stronger than that of the plastic sheet 16 and the metallic decorative resin molded body 18 in the operation key sheet 15.

Modification Common to Each Embodiment [FIG. 14] : The base material sheets 6b and 16b in the first to third embodiments are provided with an outer peripheral frame 20 that surrounds the base layers 8, 13, and 17 on the outside thereof. The same resin as 7c, 12c, and 18c can be provided at the same time as the molding of the resin moldings 7c, 12c, and 18c. FIG. 14 shows a modification of the first embodiment. When the outer peripheral frame 20 is provided in this manner, the base sheet 6b, 16b can be hardly bent due to the rigidity of the outer peripheral frame 20, and the metal plating layers 9, 14 having a uniform layer thickness can be formed. The wet plating process is performed in a plating aqueous solution. When the plastic sheet 6 is immersed in the plating aqueous solution by the outer peripheral frame 20, the plastic sheet 6 is bent by the resistance of the aqueous solution or is immersed in the plating aqueous solution. This is because it is possible to prevent the plastic sheet 6 from being bent by the water flow of the aqueous solution being stirred.

Example 1 The operation key sheet (5) shown in the first embodiment was manufactured. A 50 μm-thick polyethylene terephthalate film was used as the base sheet (6b), and the resin molded body (7) was formed by injection molding of ABS resin to a height of 1 mm. The base layer (8) was formed by diluting an ABS resin of the same grade as the resin molded body (7) with a solvent and forming a coating thickness of 30 μm by gravure printing. In addition, between the base material sheet (6b) and the base layer (8), polyester resin-based paint and chloroacetic acid-acrylic resin-based paint were laminated and printed to increase adhesion. The metal plating layer (9) was a laminate of an electroless plating layer (9a) made of nickel and an electrolytic plating layer (9b) made of chromium. The outer dimensions of the obtained operation key sheet (5) are about 2 cm in length, about 2 cm in width, and about 1.1 mm in height.

Example 2 The operation key sheet (11) shown in the second embodiment was manufactured. The difference from Example 1 is that the resin molded body (5) is a conductive resin in which carbon particles are dispersed in a polyester resin, the coating thickness of the underlayer is 50 μm, and the metal plating layer (14) is made of chromium. It is that it became the single layer of the electroplating layer which becomes. The outer dimensions of the obtained operation key sheet (11) are the same as those of the operation key sheet (5) of the first embodiment.

Example 3 The operation key sheet (15) shown in the third embodiment was manufactured. A polycarbonate film having a thickness of 10 μm was used for the base material sheet (16b), and the key top portion (18a) of the resin molded body (18c) was injection-molded with ABS resin to a height of 1 mm. For the underlayer (17), an ABS resin of the same grade as the key top portion (18a) was diluted with a solvent, and a coating thickness was formed to 30 μm by screen printing. The metal plating layer (9) was a laminate of an electroless plating layer (9a) made of nickel and an electrolytic plating layer (9b) made of chromium. Further, a pusher (19) was applied and formed on the back surface of the base sheet (16b) with an ultraviolet curable acrylic resin. The outer dimensions of the obtained operation key sheet (15) are about 2 cm in length, about 2 cm in width, and about 1.1 mm in height.

The rear perspective view of a digital still camera equipped with an operation key sheet. The top view of the operation key sheet | seat of 1st Embodiment. FIG. 3 is a sectional view taken along line SA-SA in FIG. 2. It is explanatory drawing of one manufacturing process of the operation key sheet | seat by 1st Embodiment, and FIG.4 (A) is a top view and FIG.4 (B) is SB-SB sectional view taken on the line of FIG.4 (A). It is explanatory drawing of one manufacturing process of the operation key sheet | seat by 1st Embodiment, FIG.5 (A) is a top view, FIG.5 (B) is SC-SC sectional view taken on the line of FIG.5 (A). It is explanatory drawing of one manufacturing process of the operation key sheet | seat by 1st Embodiment, FIG.6 (A) is a top view, FIG.6 (B) is the SD-SD sectional view taken on the line of FIG.6 (A). FIGS. 7A and 7B are explanatory diagrams of one manufacturing process of an operation key sheet according to the first embodiment, where FIG. 7A is a plan view, and FIG. 7B is a cross-sectional view taken along the line SE-SE in FIG. The top view of the operation key sheet by 2nd Embodiment. FIG. 9 is a sectional view taken along line SF-SF in FIG. 8. It is explanatory drawing of one manufacturing process of the operation key sheet | seat by 2nd Embodiment, and FIG.10 (A) is a top view and FIG.10 (B) is the SG-SG sectional view taken on the line of FIG.10 (A). The top view of the operation key sheet | seat by 3rd Embodiment. FIG. 12 is a cross-sectional view taken along the line SH-SH in FIG. 11. It is explanatory drawing of one manufacturing process of the operation key sheet | seat by 3rd Embodiment, FIG.13 (A) is a top view, FIG.13 (B) is the SI-SI sectional view taken on the line of FIG.13 (A). It is explanatory drawing of the manufacturing process by the modification of the operation key sheet | seat common to each embodiment, and FIG.14 (A) is a top view and FIG.14 (B) is the SJ-SJ sectional view of FIG.14 (A). Figure. It is explanatory drawing of the conventional decorating key top, fractional drawing 15 (A) is explanatory drawing of one manufacturing process, and partial diagram 15 (B) is sectional drawing of a decorating key top.

Explanation of symbols

1 resin runner 2 key top 2a key top body 3 metal layer 4 cutting trace

5 Operation key sheet (first embodiment)
6 Plastic sheet 6a Through-hole 6b Base sheet 6c Connection part 7 Metal decoration resin molding 7a Key top part 7b Presser part 7c Resin molding 8 Underlayer 8b Adhering part 8c Road part 8d Contact contact part 9 Metal plating layer 9a Electroless plating layer 9b Electrolytic plating layer 10 Cut blade

11 Operation Key Sheet (Second Embodiment)
DESCRIPTION OF SYMBOLS 12 Metal tone decoration resin molding 12a Key top part 12b Pusher part 12c Resin molding 13 Base layer 13c Road part 13d Contact contact part 14 Metal plating layer

15 Operation Key Sheet (Third Embodiment)
16 Plastic Sheet 16b Base Material Sheet 16c Connecting Portion 17 Underlayer 17b Adhering Portion 17c Road Portion 17d Contact Contact Portion 18 Metallic Decorated Resin Molded Body 18a Key Top Portion 18c Resin Molded Body 19 Pusher 20 Outer Frame

Claims (12)

A method for producing a sheet with a metal-decorated resin molded body, in which a plurality of resin-molded bodies decorated with a metallic decoration are fixed on a plastic sheet, and the plastic sheet forms a connecting portion of the resin molded body. ,
Applying and forming a base layer to be a conductive path on a plastic substrate sheet with a resin liquid to which metal plating is attached;
In the molten resin to which the metal plating adheres, a step of providing a resin molded body in contact with the base layer on the base sheet;
Performing wet plating to form a metal plating layer on the surface of the base layer and the resin molded body;
Leaving the connecting portion and the resin molded body, cutting and removing an excess base material sheet on which a conductive path is formed;
The manufacturing method of the sheet | seat with a metal decoration resin molding which performs this.   The manufacturing method of the sheet | seat with a metal tone decoration resin molding of Claim 1 which performs the process of apply | coating and forming a base layer by a printing process.   The step of providing the resin molded body on the base sheet is a process of inserting the base sheet into an injection mold, injecting a molten resin, and integrally molding the base sheet and the resin molded body. The manufacturing method of the sheet | seat with a metal tone decoration resin molding of Claim 2.   The method for producing a sheet with a metallic decorative resin molded body according to any one of claims 1 to 3, wherein the step of performing wet plating is a step of performing electrolytic plating.   The method for producing a sheet with a metallic decorative resin molded body according to any one of claims 1 to 4, wherein the step of performing wet plating is a step of performing electrolytic plating after performing electroless plating.   The manufacturing method of the sheet | seat with a metal tone decoration resin molding of any one of Claims 1-5 which includes the resin component which makes a resin molding as a resin component which makes a foundation layer, and forms a foundation layer. A plurality of resin molded bodies decorated with a metallic decoration are fixed on a plastic sheet, and the plastic sheet is a sheet with a metallic decorative resin molded body formed by forming a connecting portion of the resin molded body,
It has a base printed layer to which metal plating adheres between the resin molded body and the plastic sheet, and the resin molded body is a solidified body in which the resin to which metal plating adheres is fused to the base printed layer,
A sheet with a metallic decorative resin molded body in which the exposed surfaces of the resin molded body and the base layer are covered with a metal plating layer.   The sheet with a metallic decorative resin molded body according to claim 7, wherein the metal plating layer is an electrolytic plating layer.   The sheet with a metallic decorative resin molded product according to claim 7, wherein the metal plating layer is a laminate of an electroless plating layer and an electrolytic plating layer.   The sheet with a metallic decorative resin molded product according to any one of claims 7 to 9, wherein the thickness of the underlayer is 5 µm to 100 µm.   The sheet | seat with a metal tone decoration resin molding in any one of Claims 7-10 containing the resin component which makes a resin molding as a resin component which makes a base layer.   The sheet with a metallic decorative resin molded body according to any one of claims 7 to 11, wherein the resin molded body is an operation button for an operation key sheet.

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