JP2008152964A - Keytop and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keytop having a fine and clear cutout character portion, even when a mixed inorganic paint layer is formed on a synthetic resin film by printing a mixed inorganic paint, without destroying this, and to provide a method for manufacturing the same. <P>SOLUTION: A mixed inorganic painting layer 13, formed by printing a mixed inorganic paste made by mixing a resin with inorganic powder and a protective layer 15, formed by printing a resin paste are disposed to form a lamination under the curved portion 11 of a transparent or translucent resin film 10, and the inorganic mixed paint layer 13 and the protective layer 15 have cutout character portions 19, that do not have the inorganic mixed paint layer 13 or the protective layer 15. A color layer 17 is placed on the protective layer 15 and the cutout character portion 19 by printing a resin paste over them. A key top body 21, made of synthetic resin, is attached to the curved portion 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a key top suitable for use in a push button switch or the like used in various electronic devices, and a manufacturing method thereof.

  In recent years, there is an increasing demand for key tops that have a specular feeling and are illuminated in push button switches used in various electronic devices such as portable devices. On the other hand, as a conventional key top, there is a structure in which a synthetic resin film is arranged on the upper surface or the lower surface of a key top body which is a molded product made of synthetic resin. When the key top using the synthetic resin film has a specular feeling and illumination, for example, the key top body and the synthetic resin film are made of a light-transmitting material, and the key top body of the synthetic resin film is formed. A vapor deposition film formed by metal vapor deposition is formed on the surface on the mounting side, a blank character portion not provided with a vapor deposition film is formed in the vapor deposition film, and the blank character portion is further covered with a translucent decorative print layer. (For example, Patent Document 1). In the key top configured as described above, when the key top is illuminated from the lower surface side, the extracted character portion can be clearly displayed on the surface side of the synthetic resin film with the color of the decorative printing layer, and the surface side of the key top is vapor-deposited. A mirror surface can be given by the film.

  On the other hand, if a vapor deposition film as described above is used to give the key top a mirror feeling, the manufacturing cost will be higher than that of a printing layer by normal printing. A method of giving a mirror feeling by printing an inorganic mixed paste obtained by mixing inorganic powder such as aluminum powder is also considered.

However, when an inorganic mixed paste is used to give a mirror feeling, there are the following problems. That is, when inorganic powder is mixed in the resin, it becomes brittle due to the inorganic powder. For this reason, if a resin key top body is attached to the synthetic resin film after forming a printing layer (hereinafter referred to as “inorganic mixed paint layer”) made of an inorganic mixed paste on the synthetic resin film, There was a possibility that a part of the fragile inorganic mixed paint layer was destroyed by heat or stress of the material. In addition, when an inorganic mixed paint layer is formed by screen-printing an inorganic mixed paste on a synthetic resin film to form a cutout character portion, the inorganic mixed paste is fragile, so the boundary between the cutout character portion and the inorganic mixed paint layer should be fine. As a result, a good cut-out character portion could not be obtained.
JP 2003-123582 A

  The present invention has been made in view of the above-mentioned points, and the object thereof is not to be destroyed even when an inorganic mixed paint layer made of an inorganic mixed paste is formed on a synthetic resin film by printing, and is fine and good. An object of the present invention is to provide a key top from which a cut character portion can be obtained and a manufacturing method thereof.

  The invention described in claim 1 is an inorganic mixed paint layer formed by printing an inorganic mixed paste obtained by mixing an inorganic powder in a resin on a transparent or translucent resin film, and a protective layer formed by printing the resin paste. Are arranged in layers, and the inorganic mixed paint layer and the protective layer are provided with a cutout character portion not provided with the inorganic mixed paint layer and the protective layer, and a resin paste is printed on the protective layer and the cutout character portion. A key top is characterized in that a color layer is disposed, and a key top body made of a synthetic resin is attached to a portion where a cutout character portion of the resin film is provided.

  In the invention described in claim 2 of the present application, an inorganic mixed paint layer formed by printing an inorganic mixed paste in which an inorganic powder is mixed in a resin is disposed on a transparent or translucent resin film. A portion provided with a cutout character portion not provided with an inorganic mixed paint layer, a color layer formed by printing a resin paste on the inorganic mixed paint layer and the cutout character portion, and further provided with a cutout character portion of the resin film And a key top body made of synthetic resin.

  The invention according to claim 3 of the present application is characterized in that the portion of the resin film provided with the punched character portion is a curved portion, and the key top body is attached in the curved portion. It is in the key top described.

  The invention according to claim 4 of the present application is the key top according to claim 1, 2 or 3, wherein the inorganic powder is a metal powder, and the inorganic mixed paint layer is a metallic layer.

  The invention according to claim 5 of the present application is the key top manufacturing method according to claim 1, wherein an inorganic mixed paste in which an inorganic powder is mixed in a resin is printed on one surface of a transparent or translucent resin film. A step of forming an inorganic mixed paint layer, a step of forming a protective layer by printing a resin paste on the inorganic mixed paint layer, and a letter cut by laser cutting on the inorganic mixed paint layer and the protective layer. A step of forming a color layer by printing a resin paste so as to cover the protective layer and the blank portion, and a key top made of a synthetic resin at a portion where the blank portion of the resin film is provided And a step of attaching a main body.

  The invention according to claim 6 of the present application is the key top manufacturing method according to claim 2, wherein an inorganic mixed paste obtained by mixing an inorganic powder in a resin is printed on one surface of a transparent or translucent resin film. A step of forming an inorganic mixed paint layer, a step of forming a cutout character portion on which the inorganic mixed paint layer is not provided by laser cutting on the inorganic mixed paint layer, and covering the inorganic mixed paint layer and the cutout character portion. A key comprising: a step of forming a color layer by printing a resin paste; and a step of attaching a key top body made of a synthetic resin to a portion provided with a cutout character portion of the resin film. In the top manufacturing method.

  According to the first and third aspects of the invention, the inorganic mixed paint layer made of a fragile material is protected by the protective layer formed by printing the resin paste, and the color layer formed by printing the resin paste is provided. Therefore, the fragile inorganic mixed paint layer is protected by the tough protective layer and the color layer. Therefore, even if the key top body is attached to the resin film in which these layers are laminated, there is no problem such as cracking or peeling off in the inorganic mixed paint layer.

  According to the second and third aspects of the invention, since the inorganic mixed paint layer made of the fragile material is protected by the color layer formed by printing the resin paste, the fragile inorganic mixed paint layer is protected by the tough color layer. The Therefore, even if the key top body is attached to the resin film in which these layers are laminated, there is no problem such as cracking or peeling off in the inorganic mixed paint layer.

  According to the fourth aspect of the present invention, the color of the key top surface can be changed to a metal color tone.

  According to the fifth aspect of the present invention, even if the key top body is attached to the resin film on which the inorganic mixed paint layer made of a fragile material is formed, the inorganic mixed paint layer does not suffer inconveniences such as cracking and peeling. In addition, since the cut character portion is formed by laser cutting, a fine and good cut character portion can be obtained even if the inorganic mixed paint layer is formed using an inorganic mixed paste made of a brittle material.

  According to the sixth aspect of the present invention, even if the key top body is attached to a resin film on which an inorganic mixed paint layer made of a fragile material is formed, problems such as cracking and peeling do not occur in the inorganic mixed paint layer. In addition, since the cut character portion is formed by laser cutting, a fine and good cut character portion can be obtained even if the inorganic mixed paint layer is formed using an inorganic mixed paste made of a brittle material.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is an enlarged schematic cross-sectional view of a key top 1-1 according to the first embodiment of the present invention. In addition, a plurality of key tops (which may be the same structure as the key top 1-1 or different structures) are actually arranged around the resin film 10 constituting the key top 1-1. The key top plate is provided with a plurality of key tops on the resin film 10. For convenience of illustration, the thickness of each member is shown to be considerably thicker than the actual thickness.

  As shown in the figure, the key top 1-1 includes an inorganic mixed paint layer 13, a protective layer 15, and a color layer 17 in the curved portion 11 of the transparent or translucent resin film 10 provided with the curved portion 11. The key top body 21 made of a synthetic resin is attached to the bending portion 11. Each component will be described below.

  The resin film 10 is composed of a transparent or translucent resin film having elasticity (flexibility). In this embodiment, a polyethylene terephthalate (PET) film is used. Of course, resin films made of various other materials such as polyphenylene sulfide (PPS) film, polyimide (PI) film, polyethylene naphthalate (PEN) film, polyetherimide (PEI) film, polyetheretherketone (PEEK) film. Polyetherketone (PEK) film, polycarbonate (PC) film, polybutylene naphthalate (PBN) film, polybutylene terephthalate (PBT) film, and the like may be used. In this embodiment, the thickness of the resin film 10 is 50 μm, but other dimensions may be used.

  The inorganic mixed paint layer 13 is continuously provided on the lower surface (inner surface) of the curved portion 11 of the resin film 10 and the lower surface of the resin film 10 outside the curved portion 11. This inorganic mixed paint layer 13 is made of a material having a metallic color tone and a specular feeling, and specifically, a metallic layer formed by printing an inorganic mixed paste in which a solvent and an inorganic powder are mixed in a resin. It is. In this embodiment, aluminum powder is used as the inorganic powder, and the thickness is 5 to 10 μm. Of course, other various inorganic powders such as metal powders such as nickel, titanium, and chromium, and various inorganic powders other than metals may be used as the inorganic powder. In this embodiment, the inorganic mixed coating layer 13 is printed with a color and thickness that does not transmit visible light (of course, it may be printed in a state of transmitting visible light). The inorganic mixed paint layer 13 is provided with a cut-out character portion (light transmission portion) 19 where the inorganic mixed paint layer 13 is not provided. The shape of the blank character portion 19 is a concept including not only characters but also numbers, figures, symbols, patterns, and the like.

  The protective layer 15 is formed by printing a polyester resin, a urethane resin, or the like dissolved in a solvent. Although the protective layer 15 may not have translucency, in this embodiment, since the material is the same as that of the color layer 17 described below, a translucent and colored material is used. In this embodiment, a black color is used. The thickness of the protective layer 15 is about 5 to 10 μm in this embodiment. The protective layer 15 is also provided with a cut-out character portion (light transmission portion) 19 that is not provided with the same protective layer 15 as the inorganic mixed paint layer 13.

  The color layer 17 is formed by printing a polyester resin, urethane resin, or the like dissolved in a solvent, and adheres to the key top body 21 when the key top body 21 made of synthetic resin is molded. The material is used. The color layer 17 has translucency and is colored, and in this embodiment, a black color is used. The thickness of the color layer 17 is about 5 to 10 μm in this embodiment. The color layer 17 is disposed on the protective layer 15 and the cutout character portion 19.

  The key top body 21 is made of a thermoplastic transparent or translucent synthetic resin material, and in this embodiment, a polycarbonate resin is used. Of course, other various synthetic resins (for example, ABS resin, PET resin, polymethyl methacrylate resin, etc. which are thermoplastic synthetic resins) may be used. The bottom surface of the key top body 21 is flush with the bottom surface of the resin film 10.

  FIG. 2 is an enlarged schematic cross-sectional view showing a state in which the rubber-like elastic plate 30 is arranged on the lower surface of the key top 1-1. As shown in the figure, the rubber-like elastic plate 30 is a transparent or semi-transparent plate member 31 having rubber-like elasticity (in this embodiment, silicon rubber is used, but any material having rubber-like elasticity may be used. A projecting pressing portion 33 protruding downward is provided on the lower surface of any other material such as other rubber material or synthetic resin material. The pressing part 33 is located directly below the key top 1-1 placed thereon.

  When the key top 1-1 is pressed, the pressing portion 33 is pressed and a switch (not shown) arranged immediately below is pressed and turned on. On the other hand, if it is illuminated by various illumination means from the lower side of the rubber-like elastic plate 30, the light is guided to the key top 1-1 through the rubber-like elastic plate 30, passes through the key-top main body 21, and is colored but emits light. The extracted character part 19 covered with the color layer 17 to be passed is transmitted, and the extracted character part 19 is clearly brightly illuminated and displayed on the surface side of the key top 1-1 (the surface side of the resin film 11). The surface side of the key top 1-1 is given a mirror feeling by the inorganic mixed paint layer 13.

  Next, a manufacturing method of the key top 1-1 will be described. 3 to 7 are explanatory diagrams of the manufacturing method of the key top 1-1. First, as shown in FIG. 3, the inorganic mixed paint layer 13 is formed by printing the inorganic mixed paste on a substantially entire surface of one surface (lower surface) of the resin film 10 by screen printing (silk screen printing).

  Next, as shown in FIG. 4, the protective layer 15 is formed by screen-printing a resin paste on a portion that becomes the curved portion 11 on the upper (lower surface) of the inorganic mixed paint layer 13.

  Next, as shown in FIG. 5, by irradiating a laser beam from the side where the protective layer 15 is provided, the protective layer 15 and the inorganic mixed paint layer 13 are laser-cut to form a cutout character portion 19. Since the inorganic mixed paint layer 13 may contain inorganic powder, if the cut character portion 19 is formed at the stage of screen printing, the boundary line between the cut character portion 19 and the inorganic mixed paint layer 13 is changed as described above. Not fine. Therefore, in the present invention, by forming the cutout character portion 19 by laser cutting, even if the inorganic mixed paint layer 13 is formed by using an inorganic mixed paste made of a fragile material, a fine and good cutout character portion 19 is obtained. It was made to be able to. In some cases, the laser beam may be irradiated from the resin film 10 side.

  Next, as shown in FIG. 6, a color layer 17 is formed by printing a resin paste so as to cover the surface of the protective layer 15, and the color of the color layer 17 is removed so that the color can be seen from the resin film 10 side. 19 is exposed. The color layer 17 is also formed in a portion that becomes the curved portion 11 on the upper surface (lower surface) of the protective layer 15.

  Next, as shown in FIG. 7, the portion of the resin film 10 on which the key top 1-1 is to be provided is drawn upward using a resin film forming mold (not shown) so as to move upward (inorganic mixed paint layer). The curved portion 11 is formed by being curved and deformed so as to be convex (with the surface on which 13 or the like is printed inside) (preforming). The shape of the bending portion 11 is made substantially the same as the upper surface shape of the key top 1-1 (however, it is not always necessary to make it substantially the same).

  Next, the resin film 10 provided with the curved portion 11 is placed in a mold for resin molding (not shown). At this time, a cavity having the same shape as the key top 1-1 is formed in the mold, and the bending portion 11 is accommodated in the cavity. When the molten resin is injected and filled in the cavity and the mold is removed after the molten resin is solidified, the key top 1-1 shown in FIG. 1 is completed.

  In the manufacturing process of the key top 1-1 described above, when the bending portion 11 is formed in the resin film 10 and when the molten resin is injected into the bending portion 11, the resin film 10 and each layer laminated thereon are provided. Stresses such as strong stretching force, contraction force and heat and pressure are applied. For this reason, the inorganic mixed paint layer 13 made of a fragile material may be partially destroyed by the stress. However, in the key top 1-1 according to the present invention, the inorganic mixed paint layer 13 made of a fragile material is provided with the inorganic mixed paint layer 13. Since the color layer 17 formed by printing the resin paste is provided after the protective layer 15 formed by printing the resin paste, the fragile inorganic mixed paint layer 13 is formed by the tough protective layer 15 and the color layer 17. Protected. Therefore, even if the stress as described above is applied to the inorganic mixed paint layer 13, there will be no inconvenience such as cracking or peeling in the inorganic mixed paint layer 13.

[Second Embodiment]
FIG. 8 is an enlarged schematic cross-sectional view of a key top 1-2 according to the second embodiment of the present invention. In the key top 1-2 shown in the figure, the same or corresponding parts as those of the key top 1-1 according to the embodiment shown in FIGS. Note that matters other than those described below are the same as those in the embodiment shown in FIGS.

  The key top 1-2 is different from the key top 1-1 only in that the protective layer 15 laminated on the lower surface side of the inorganic mixed paint layer 13 is omitted in the key top 1-1. That is, the key top 1-2 is an inorganic material formed by printing and forming an inorganic mixed paste in which an inorganic powder is mixed in a resin in the curved portion 11 of the transparent or translucent resin film 10 provided with the curved portion 11. The mixed paint layer 13 is arranged, the inorganic mixed paint layer 13 is provided with a cutout character portion 19 where the inorganic mixed paint layer 13 is not provided, and the resin paste is printed on the inorganic mixed paint layer 13 and the cutout character portion 19. A layer 17 is arranged so that the color of the color layer 17 is exposed to the cutout character portion 19 so that the color can be seen from the resin film 10 side, and a key top body 21 made of synthetic resin is attached to the curved portion 11. ing.

  Also, the key top 1-2 manufacturing method is different from the key top 1-1 manufacturing method only in that the step of forming the protective layer 15 is omitted. That is, the production of the key top 1-2 includes the step of forming the inorganic mixed paint layer 13 by printing on one surface of the transparent or translucent resin film 10 an inorganic mixed paste in which an inorganic powder is mixed in the resin. , A step of forming a cutout character portion 19 in which the inorganic mixed paint layer 13 is not provided by laser cutting on the inorganic mixed paint layer 13, and a resin paste is printed so as to cover the inorganic mixed paint layer 13 and the cutout character portion 19. A step of forming the color layer 17 and exposing the color layer 17 to the character portion 19 so that the color of the color layer 17 can be seen from the resin film 10 side, and a surface of the resin film 10 on which the inorganic mixed paint layer 13 is printed as an inner side And bending the curved portion 11 to form the curved portion 11 and molding the key top body 21 made of synthetic resin in the curved portion 11.

  When the protective layer 15 is not provided as in this embodiment, the color layer 17 also serves as a protective layer. That is, as described in the above embodiment, the color layer 17 is formed of the same material as that of the protective layer 15. Therefore, the color layer 17 protects the inorganic mixed paint layer 13, and accordingly, the key top 1-2 has the key top 1-2. In the manufacturing process, when the bending portion 11 is formed in the resin film 10 and when the molten resin is injected into the bending portion 11, the resin film 10 and each layer laminated on the resin film 10 have strong stretching force, contraction force, and heat. In the key top 1-2 according to the present invention, the inorganic mixed paint layer 13 made of a fragile material is protected by the color layer 17 formed by printing a resin paste. The mixed paint layer 13 is protected by a tough color layer 17. Therefore, even if the stress as described above is applied to the inorganic mixed paint layer 13, there will be no inconvenience such as cracking or peeling in the inorganic mixed paint layer 13. In addition, since the inorganic mixed paint layer 13 is laser-cut by irradiating a laser beam to form a cut-out character part 19, even if the inorganic mixed paint layer 13 is formed using an inorganic mixed paste made of a fragile material, it is fine. A favorable blank portion 19 is obtained.

[Third Embodiment]
FIG. 9 is an enlarged schematic cross-sectional view of a key top 1-3 according to the third embodiment of the present invention. In the key top 1-3 shown in the figure, the same reference numerals are given to the same or corresponding parts as those of the key top 1-1 according to the embodiment shown in FIGS. Note that matters other than those described below are the same as those in the embodiment shown in FIGS.

  The key top 1-3 is different from the key top 1-1 in that the resin film 10 is not provided with the curved portion 11, and the key top body 21 made of a synthetic resin is directly mounted on the planar resin film 10. Is a point. In the case of this embodiment, since the resin film 10 is not curved and deformed, the stress on the inorganic mixed paint layer 13 is reduced correspondingly, but the heat, pressure and mechanical properties when the key top body 21 is attached by molding or other methods are reduced. Since the external force is applied, the fragile inorganic mixed paint layer 13 may be destroyed, and it is effective to protect the inorganic mixed paint layer 13 by providing the protective layer 15 and the color layer 17 on the lower surface side thereof.

  That is, the key top 1-3 is a protective film formed by printing an inorganic mixed paint layer 13 formed by printing an inorganic mixed paste obtained by mixing an inorganic powder in a resin and a resin paste on a transparent or translucent resin film 10. The layer 15 is disposed in a laminated manner, and the inorganic mixed paint layer 13 and the protective layer 15 are provided with a cutout character portion 19 that is not provided with the inorganic mixed paint layer 13 and the protective layer 15. A color layer 17 formed by printing a resin paste is disposed thereon, and a key top body 21 made of a synthetic resin is attached to a portion of the resin film 10 where a cut character portion 19 is provided.

  Further, the method for manufacturing the key top 1-3 also omits the point of forming the curved portion 11 as compared with the method for manufacturing the key top 1-1. That is, the key top 1-3 is manufactured by forming an inorganic mixed paint layer 13 by printing an inorganic mixed paste obtained by mixing an inorganic powder in a resin on one surface of a transparent or translucent resin film 10. A step of forming a protective layer 15 by printing a resin paste on the inorganic mixed paint layer 13, and a step of forming a cutout portion 19 by laser cutting in the inorganic mixed paint layer 13 and the protective layer 15; A step of forming a color layer 17 by printing a resin paste so as to cover the protective layer 15 and the cutout character portion 19, and a key top body made of a synthetic resin at a portion where the cutout character portion 19 of the resin film 10 is provided. The step of attaching 21 is performed.

  In the case of this embodiment, the same effect as in the case of the first embodiment is obtained. In this embodiment, the inorganic mixed paint layer 13, the protective layer 15, and the color layer 17 are arranged on the lower surface side of the resin film 10 (the surface opposite to the surface on which the key top main body 21 is attached). May be arranged on the upper surface side (the surface on the side where the key top main body 21 is attached).

[Fourth Embodiment]
FIG. 10 is an enlarged schematic cross-sectional view of a key top 1-4 according to the fourth embodiment of the present invention. In the key tops 1-4 shown in the figure, the same or corresponding parts as those of the key tops 1-2 according to the embodiment shown in FIG. Items other than those described below are the same as those in the embodiment shown in FIG.

  The key top 1-4 is different from the key top 1-2 in that the resin film 10 is not provided with the curved portion 11 and the key top body 21 made of synthetic resin is directly attached on the planar resin film 10. Is a point. In the case of this embodiment as well as the third embodiment, since the resin film 10 is not curved and deformed, the stress on the inorganic mixed paint layer 13 is reduced accordingly, but the key top body 21 is attached by molding or other methods. The fragile inorganic mixed paint layer 13 may be destroyed because the heat, pressure and mechanical external force are applied, and the protective layer 15 and the color layer 17 are provided on the lower surface side to protect the inorganic mixed paint layer 13. It is effective to do.

  That is, the key top 1-4 is provided with an inorganic mixed paint layer 13 formed by printing an inorganic mixed paste obtained by mixing an inorganic powder in a resin on a transparent or translucent resin film 10. 13 is provided with a cutout character portion 19 where the inorganic mixed paint layer 13 is not provided, a color layer 17 formed by printing a resin paste on the inorganic mixed paint layer 13 and the cutout character portion 19, and the resin film 10. The key top body 21 made of a synthetic resin is attached to the portion provided with the blank character portion 19.

  Further, in the method for manufacturing the key top 1-4, the point of forming the curved portion 11 is omitted as compared with the method for manufacturing the key top 1-2. That is, the manufacturing of the key top 1-4 includes the step of forming the inorganic mixed paint layer 13 by printing an inorganic mixed paste in which an inorganic powder is mixed in a resin on one surface of a transparent or translucent resin film 10. A step of forming a cutout character portion 19 in which the inorganic mixed paint layer 13 is not provided by laser cutting on the inorganic mixed paint layer 13, and printing a resin paste so as to cover the inorganic mixed paint layer 13 and the cutout character portion 19. The step of forming the color layer 17 and the step of attaching the key top body 21 made of synthetic resin to the portion of the resin film 10 where the cutout character portion 19 is provided are performed.

  In the case of this embodiment, the same effect as in the case of the second embodiment is obtained. In this embodiment, the inorganic mixed paint layer 13 and the color layer 17 are disposed on the lower surface side of the resin film 10 (the surface opposite to the surface on which the key top main body 21 is attached), but conversely the upper surface side of the resin film 10 ( You may arrange | position in the surface on the side which attaches the keytop main body 21).

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. It should be noted that any shape, structure, and material not directly described in the specification and drawings are within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited. For example, in the above-described embodiment, the inorganic mixed paint layer 13, the protective layer 15, and the color layer 17 are all provided one by one, but a plurality of layers may be provided as necessary. In the above embodiment, the color layer 17 is black. However, other various colors may be used, and the color of the color layer 17 referred to in the present invention is a concept including colorless and transparent. In the above embodiment, the protective layer 15 and the color layer 17 are made of the same material, but may be made of different materials. Further, when the extracted character portion 19 is not the illumination type from the back side, the color layer 17 may be made of a material that does not transmit light. Further, although the rubber-like elastic plate 30 is disposed on the lower surface side of the key top 1-1, the rubber-like elastic plate 30 may be omitted and the switch may be directly pressed on the lower surface of the key top 1-1.

  Moreover, in the said embodiment, the resin film 10 which formed the curved part 11 previously (preforming) is installed in the metal mold | die for resin molding, and melt molding resin is press-fitted in a cavity, and key tops 1-1 and 1 are carried out. -2 was manufactured, but the preforming process was omitted, and the flat resin film 10 shown in FIG. 6 was directly placed in the mold for resin molding, and the molten resin was press-fitted into the cavity. The key tops 1-1 and 1-2 may be manufactured by extending the resin film 10 to the inner wall surface of the cavity by heat and pressure to form the curved portion 11. Moreover, in the said embodiment, although the keytop main body 21 was attached to the resin film 10 by shape | molding using a metal mold | die, the keytop main body 21 attaches to the resin film 10 by printing or application | coating etc., for example, Alternatively, the key top body 21 molded in advance as a single product may be attached to the resin film 10 by adhesion or the like.

It is an expansion schematic sectional drawing of the key top 1-1. It is an expansion schematic sectional drawing which shows the state which has arrange | positioned the rubber-like elastic board 30 on the lower surface of the keytop 1-1. It is explanatory drawing of the manufacturing method of the key top 1-1. It is explanatory drawing of the manufacturing method of the key top 1-1. It is explanatory drawing of the manufacturing method of the key top 1-1. It is explanatory drawing of the manufacturing method of the key top 1-1. It is explanatory drawing of the manufacturing method of the key top 1-1. It is an expansion schematic sectional drawing of the key top 1-2. It is an expansion schematic sectional drawing of the key top 1-3. It is an expansion schematic sectional drawing of the key top 1-4.

Explanation of symbols

1-1 Key Top 10 Resin Film 11 Curved Part 13 Inorganic Mixed Paint Layer (Metallic Layer)
15 Protective layer 17 Color layer 19 Extracted character part (light transmission part)
21 Key Top Body 30 Rubber Elastic Plate 1-2 Key Top 1-3 Key Top 1-4 Key Top

Claims (6)

An inorganic mixed paint layer formed by printing an inorganic mixed paste in which an inorganic powder is mixed in a resin and a protective layer formed by printing the resin paste are laminated on a transparent or translucent resin film. The mixed paint layer and the protective layer are provided with a cutout character portion not provided with the inorganic mixed paint layer and the protective layer, and a color layer formed by printing a resin paste on the protective layer and the cutout character portion is disposed,
A key top comprising: a key top body made of a synthetic resin attached to a portion of the resin film where a cut character portion is provided. An inorganic mixed paint layer formed by printing an inorganic mixed paste in which an inorganic powder is mixed in a resin is placed on a transparent or translucent resin film. Is provided, and a color layer formed by printing a resin paste on the inorganic mixed paint layer and the extracted character portion is disposed,
A key top comprising: a key top body made of a synthetic resin attached to a portion of the resin film where a cut character portion is provided. The portion of the resin film provided with the cutout character portion is a curved portion,
The key top according to claim 1 or 2, wherein the key top main body is mounted in the curved portion.   The key top according to claim 1, wherein the inorganic powder is a metal powder, and the inorganic mixed paint layer is a metallic layer. The key top manufacturing method according to claim 1,
Forming an inorganic mixed coating layer by printing an inorganic mixed paste in which an inorganic powder is mixed in a resin on one surface of a transparent or translucent resin film;
Forming a protective layer by printing a resin paste on the inorganic mixed paint layer;
Forming a cut-out character portion by laser cutting in the inorganic mixed paint layer and the protective layer;
Forming a color layer by printing a resin paste so as to cover the protective layer and the blank portion;
Attaching a key top body made of synthetic resin to a portion provided with a letter cut portion of the resin film;
A key top manufacturing method comprising the steps of: The key top manufacturing method according to claim 2,
Forming an inorganic mixed coating layer by printing an inorganic mixed paste in which an inorganic powder is mixed in a resin on one surface of a transparent or translucent resin film;
A step of forming a blank character portion in which the inorganic mixed paint layer is not provided by laser cutting on the inorganic mixed paint layer;
Forming a color layer by printing a resin paste so as to cover the inorganic mixed paint layer and the extracted character part; and
Attaching a key top body made of synthetic resin to a portion provided with a letter cut portion of the resin film;
A key top manufacturing method comprising the steps of:

Images