JP4724645B2 - Manufacturing method of pushbutton switch member - Google Patents

Description

  The present invention relates to a method for manufacturing a member for a push button switch.

  A member for a push button switch used in a cellular phone or the like includes a plurality of key tops and a key sheet for attaching the key tops at predetermined positions. The member for a push button switch is generally cut into a key top molded body filled with a resin core material in the recess on the back side of the resin film molded body constituting the surface of the key top, for each key top. It is manufactured by a method in which each key top is bonded onto a key sheet made of a rubber-like elastic body (see, for example, Patent Document 1).

Typical cutting methods for each key top include a method using a cutting tool or a method using a laser. In particular, the cutting method using a laser can freely change the width of the cutting allowance by adjusting the beam diameter of the laser. For this reason, recently, a laser has been used in a cutting process in manufacturing a pushbutton switch member having a narrow key top interval.
JP-A-11-162278 (paragraph number 0022, etc.)

  However, when each key top is cut and affixed to the key sheet, it is difficult to accurately affix the key top at a predetermined position. In particular, as the distance between the key tops becomes smaller as the push button switch member becomes smaller, a slight misalignment of the key tops causes a malfunction of the key operation.

  In addition, when cutting each key top using a laser, there is a problem that fine powder generated by melting or sublimation of the key top cutting allowance adheres to the surface of the key top. Furthermore, the top surface of the key top molded body is usually placed on a jig and cut while irradiating laser light from the back side of the key top molded body, resulting in contact with the jig on the top surface of the key top. There is a risk of scratching.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to make it possible to accurately arrange the key top, to clean the top surface of the key top, and to prevent damage.

  In order to achieve the above object, the present invention is a method for manufacturing a member for a push button switch having a plurality of key tops, and is recessed at a boundary between the plurality of key tops in a downward direction from the top surface of the key top. In a key top molded body having a concave portion and a plurality of key tops connected to each other by the concave portion, a film pasting step of pasting a resin film on the top surface side of the key top without closely contacting the concave portion, and pasting the resin film A key top separation step of concentrating the laser beam from the opposite surface to the processed portion of the recess, leaving the resin film, and separating the key top molded body into a plurality of key tops, and a plurality of key tops A method for manufacturing a member for a pushbutton switch, including a key sheet attaching step for attaching a key sheet to the back side of a plurality of key tops while the resin film is attached to the top surface It is set to.

  If such a manufacturing method is adopted, even if the laser beam is condensed from the back surface of the key top molded body, the laser beam is not focused on the resin film attached to the top surface of the key top. Only the processed part can be easily cut, and the resin film itself can be made difficult to cut. For this reason, after cut | disconnecting a keytop molded object for every keytop, it can arrange | position to a key sheet | seat with each keytop being affixed with the resin film. Therefore, it is not necessary to attach each key top. In addition, since the key top molded body is cut with the resin sheet attached to the top of the key top, fine powder of the cutting allowance is attached to the top of the key top or placed under the key top molded body. Hard to be scratched by friction with the jig to be removed.

  Another aspect of the present invention is a method for manufacturing a member for a push button switch, in which the resin film according to the present invention is a film made of a polyolefin resin.

  When a polyolefin resin is used for the resin film, in particular, the resin film, the resin film can be made difficult to be cut by the laser beam. Among polyolefin resins, a polyethylene resin is more preferable.

  In the present invention, the key top molded body is a molded body in a state where the key tops to be operated are connected, and after forming a resin film, it has a form in which a core material is formed on the back side thereof. Alternatively, it may be composed of one kind of resin.

  When producing a key top molded body in which a core material is formed on the back side of a resin film, a method of injecting a photocurable resin as a core material into a concave portion of a resin film that has been molded in advance and curing the resin, For example, a method may be employed in which a film is placed in a mold for injection molding and a molten resin as a core material is injected therein. When using a photocurable resin as a core material, it is preferable to use an EB curable resin, a UV curable resin, or an anaerobic combined UV curable resin. The EB curable resin is a resin that is cured by irradiation with an electron beam. The UV curable resin is a resin that is cured by irradiation with ultraviolet rays. The anaerobic combined UV curable resin is a resin that imparts anaerobic property to UV curable properties, and is a resin that is cured by irradiating ultraviolet rays while blocking air. Of these, UV curable resins are particularly preferable. This is because the cost is low and the curing speed is high, which is advantageous for productivity. These photocurable resins contain a main agent and a photoinitiator. Examples of the main agent include urethane-based, epoxy-based, polyester-based, silicone-based, and polybutadiene-based acrylate resins. Examples of photoinitiators include benzophenone photopolymerization initiators, acetophenone photopolymerization initiators, and thioxanthone photopolymerization initiators. Further, in the case of an anaerobic combined UV curable resin, an organic peroxide, an aromatic sulfimide and various amines are added. Here, examples of the organic peroxide include ketone peroxide, dialkyl peroxide, diacyl peroxide, and peroxyesters.

  Further, when a core material is formed by injecting a molten resin, a thermoplastic resin is suitably used as the core material. In particular, the thermoplastic resin used as the core material is preferably a polycarbonate / ABS copolymer resin, an ABS resin, an acrylic resin, a polyethylene terephthalate resin, or a polycarbonate resin.

  A thermoplastic resin is preferably used as the resin film covering the surface of the core material. In particular, an acrylic resin is preferable as the thermoplastic resin used as the resin film.

The key sheet is a sheet-like component disposed on the back side of the key top, and it is necessary to press a switch disposed in the back direction of the key sheet by pressing the key top. What is comprised from this is preferable. In particular, silicone rubber is suitable as the key sheet material. Further, an electroluminescence (EL) sheet (hereinafter referred to as “EL sheet”) can also be used as the key sheet. As the EL sheet, an inorganic EL sheet is suitable. A typical inorganic EL sheet has a structure in which a light-emitting layer (for example, a layer containing ZnS + Cu) and a dielectric layer (for example, a BaTiO ₃ layer) are adjacent to each other, and both sides thereof are sandwiched between electrode layers. This is a structure in which a transparent resin film is attached to the side (outside of the electrode on the light emitter layer side). Thus, by disposing the EL sheet below the key top, a specific part of the key top (for example, the top surface of the key top, the gap between the key tops) can be illuminated. Therefore, it is possible to provide a push button switch member that not only enables use in a dark place but also has high functionality and design.

  According to the present invention, in the manufacturing process of the member for a push button switch, the key top can be accurately arranged, and the top surface of the key top can be kept clean and not damaged.

  Next, a preferred embodiment of a method for manufacturing a member for a push button switch according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiments described below.

(First embodiment)
FIG. 1 is a plan view of a pushbutton switch member 1. 2 is a cross-sectional view of the pushbutton switch member 1 taken along the line AA in FIG.

  As shown in FIG. 1, the push button switch member 1 has a plurality of key tops 2 arranged at predetermined intervals so as to be individually operable. A recess 7 that is recessed toward the back side is formed between adjacent key tops 2, and a slit 8 that penetrates to the back side is formed at the bottom of the recess 7. As shown in FIG. 2, each key top 2 is affixed to the key sheet 4 with the adhesive layer 3 interposed therebetween. A concave indenter 6 that protrudes downward is arranged on the back surface of the key sheet 4 that contacts each key top 2 so that the switch can be turned on and off when the key top 2 is pushed. The pressing element 6 is affixed to the key sheet 4 with the adhesive layer 5 interposed therebetween.

  FIG. 3 is a flowchart showing the main flow of the manufacturing process of the pushbutton switch member 1. 4 to 13 are diagrams for explaining a manufacturing process of the pushbutton switch member 1.

  First, as shown in FIG. 4A, a decorative layer 11 is formed on a resin film 10 (step S101). The film 10 is made of a resin having excellent translucency so that the illumination of each key top 2 can be realized when the EL sheet is disposed below the push button switch member 1. In this embodiment, an acrylic resin film having a thickness of about 0.2 mm is employed as the film 10. The decorative layer 11 is formed using screen printing, offset printing, gravure printing, or the like. In addition, in order to easily perform more complicated and richly designed printing, an electronic printing machine such as a melt type thermal transfer printer, a sublimation type thermal transfer printer, an ink jet printer, a toner transfer type printer, or the like may be used.

  Next, the film 10 on which the decorative layer 11 is formed (hereinafter referred to as “decorative film 12”) is formed into an uneven shape in accordance with the arrangement of the key top 2 (step S102). As a molding method, as shown in FIG. 4 (B), the decorative film 12 softened by heating is set inside the mold 15, and air of a predetermined pressure is applied from the opposite side to the mold 15, Pneumatic forming that transfers the inner shape of the mold 15 to the decorative film 12 is employed. After the molding in step S102, the molded body of the decorative film 12 (hereinafter referred to as “film molded body” 13) is separated from the mold 15.

  In addition to pressure forming, vacuum forming that draws vacuum from the mold 15 side and transfers the inner shape of the mold 15 to the decorative film 12, and pressure vacuum forming that combines the above-described pressure forming with the vacuum forming is adopted. You can also Moreover, you may employ | adopt the metal mold | die shaping | molding which pinches the decorative film 12 with a concave mold | die and a convex mold | die, and shape | molds in a predetermined shape.

  The part surrounded by the dotted line of the film molded body 13 shown in FIG.

  As shown in FIG. 6, an ultraviolet curable acrylic resin is disposed in the recess 20 formed on the back side of the film molded body 13, and ultraviolet rays are radiated using the ultraviolet irradiation means 30. To form the top core 21 (step S103). The top core 21 formed in step S103 is made of a hard acrylic resin. This is to prevent deformation even when subjected to finger pressure during user operation.

  Next, as shown in FIG. 7, a decoration layer 41 is formed on the key top back plate 40 that becomes the back plate of the key top 2 (step S104). The decoration layer 41 may be formed on any surface of the key top back plate 40. In this embodiment, 0.1 mm thick polyethylene terephthalate (PET) is used as the key top back plate 40. The key top back plate 40 made of PET is preferably subjected to surface treatment (e.g., easy adhesion treatment) such as corona discharge and ion etching. However, acrylic resin may be adopted instead of PET. The formation method of the decoration layer 41 in step S104 is the same method as the process of step S101. However, step S104 may be omitted and the key top back plate 40 without the decorative layer 41 may be used.

  Next, an ultraviolet curable acrylic resin-based adhesive is injected onto the top core 21 for forming the undercore 31, and from there, a key top back plate 40 on which a decorative layer 41 is formed (hereinafter referred to as “the top core 21”). The “decorative plate 42” is attached (step S105).

  Next, as shown in FIG. 8, the ultraviolet irradiating means 30 is used to irradiate the ultraviolet curable acrylic resin adhesive with ultraviolet rays to produce the key top molded body 50 (step S106).

  Next, as shown in FIG. 9, the polyethylene film 61 which is one form of a resin film is affixed on the top | upper surface (namely, convex surface of the decorating film 12) of the keytop 2 in the keytop molded object 50 (step S107). . An adhesive material 62 is attached to one side of the polyethylene film 61. As the adhesive 62, an acrylic, ethylene vinyl acetate (EVA), or rubber adhesive can be suitably used. A thin double-sided tape may be used as the adhesive material 62. Note that the polyethylene film 61 may be attached by static electricity without attaching the adhesive material 62 to the polyethylene film 61. The polyethylene film 61 used in this embodiment is a film having a thickness of 60 to 70 microns, but a polyethylene film 61 having a thickness exceeding 70 microns may be used. On the surface on the front side of the key top molded body 50, a convex portion that becomes the top surface of the key top 2 and a concave portion 7 that separates the key tops 2 are formed. The polyethylene film 61 is adhered so as to be in close contact with only the convex portion of the key top molded body 50 and leave a space for the concave portion 7. The key top molded body 50 to which the polyethylene film 61 is attached is placed on the jig 60 so that the polyethylene film 61 side is in contact with the jig 60. The jig 60 is for preventing a cut mark from being made below the jig 60 when the concave portion 7 of the key top molded body 50 is laser-cut.

  Next, as shown in FIG. 10, the key top molded body 50 is moved for each key top 2 while condensing the laser 70 at a position 52 on the decorative plate 42 opposite to the concave portion 7 and scanning the laser 70. Cut (step S108). In this embodiment, the thickness (X) of the key top molded body 50 at the position of the recess 7 is 0.4 mm. The thickness (Y) of the key top molded body 50 at the position of the top surface of the key top 2 is 0.8 mm. There is a difference of 0.4 mm to 0.8 mm between the position where the polyethylene film 61 is pasted and the position where the laser 70 is condensed during laser cutting. For this reason, the laser 70 is not focused on the polyethylene film 61. Therefore, only the position of the concave portion 7 of the key top molded body 50 can be cut without completely cutting the polyethylene film 61. In this embodiment, the depth of the recess 7 is set to 0.4 mm. However, the greater the depth of the recess 7, the more the key top molded body 50 can be cut without cutting the polyethylene film 61. Even if the depth of the concave portion 7 is smaller than 0.4 mm, the key top molded body 50 can be cut while leaving the polyethylene film 61. However, when laser cutting is performed with a condensing diameter in the following range, More preferably, the depth is 0.2 mm or more.

  In this embodiment, the condensed diameter of the laser 70 is φ0.05 mm to φ0.2 mm. The laser scanning speed is about 200 mm / sec. The laser 70 is normally scanned 1-3 times on the same path. When the thickness of the concave portion 7 is small or the key top molded body 50 is made of a material that can be easily cut by a laser, the laser may be scanned once, but when the thickness of the concave portion 7 is large or the key When the top molded body 50 is made of a material that is difficult to cut with a laser, the laser may be scanned twice or more. In this embodiment, a carbon dioxide laser generator with a maximum output of 30 W is used as the laser processing machine. The laser output is 70% of the maximum output. However, the laser processing machine may be a processing machine that can use a laser other than a carbonic acid laser (for example, a YAG laser).

  As a result of laser cutting the key top molded body 50 under the above conditions, as shown in FIG. 11, a slit 8 having a width of 0.2 mm to 0.3 mm is formed at the position of the concave portion 7 of the key top molded body 50. That is, the plurality of key tops 2 are distributed on the polyethylene film 61 with the slits 8 having a width of 0.2 mm to 0.3 mm. A part of the polyethylene film 61 may be cut when the output of the laser 70 is large. However, most of the scanning path of the laser 70 in the polyethylene film 61 remains without being cut.

  In the step S108, the resin fine powder melted, vaporized or sublimated by the heat of the laser 70 is sucked using an external suction machine. However, some of the fine powder is captured by the adhesive material 62 of the polyethylene film 61. Since the polyethylene film 61 is in close contact with the top surface of the key top 2, resin fine powder at the cutting allowance does not adhere to the top surface of the key top 2, and the top surface of the key top 2 can be kept clean. Further, since the top surface of the key top 2 is not in direct contact with the jig 60, it is possible to effectively prevent the top surface of the key top 2 from being damaged. Further, since each key top 2 is stuck as it is on the polyethylene film 61 after being cut by the laser 70, the polyethylene film 61 is used as a carrier (transport medium) when sticking each key top 2 on the key sheet 4. it can. Therefore, it is not necessary to stick the key tops 2 on the key sheet 4 individually.

  Next, as shown in FIG. 12, the key top 2 is attached to the key sheet 4 through the adhesive layer 3 (step S109). The key sheet 4 can be a rubber-like elastic sheet (for example, a silicone rubber sheet) or an EL sheet. In the process of step S <b> 109, the plurality of key tops 2 are attached to the key sheet 4 with their top surfaces attached to the polyethylene film 61.

  Next, the pressing element 6 having an area smaller than each key top 2 is attached to the pressing position of each key top 2 on the back side of the key sheet 4 through the adhesive layer 5 (step S110). Finally, the polyethylene film 61 is removed from the top surface of each key top 2 (step S111). Note that step S110 and step S111 may be reversed. Thus, the push button switch member 1 shown in FIG. 13 is completed.

(Second embodiment)
Next, the manufacturing method of the member for pushbutton switches which concerns on 2nd embodiment is demonstrated. Note that the form shown in FIGS. 1 and 2 is the same in the second embodiment.

  FIG. 14 is a flowchart showing a main flow of a manufacturing process of the member for a push button switch according to the second embodiment. 15 to 19 are diagrams for explaining a manufacturing process of the pushbutton switch member 1.

  First, the decoration layer 11 is formed in the resin film 10 (step S201). Also in this embodiment, an acrylic resin film having a thickness of about 0.2 mm is employed as the film 10. Next, the film 10 on which the decorative layer 11 is formed (this is referred to as “decorative film 12”) is placed in a mold for injection molding in a heated state (step S202). The decorative film 12 is arranged so that the decorative layer 11 is inside the mold. Next, the molten resin is injected into a mold for injection molding to form the core 75 (step S203). As a result. As shown in FIG. 15, a key top molded body 80 in which the key tops 2 are connected to each other can be formed. In this embodiment, polycarbonate / ABS copolymer resin or ABS resin is used as the resin for forming the core 75. However, an acrylic resin may be adopted as the resin for forming the core 75.

  Next, as shown in FIG. 16, the polyethylene film 61 which is one form of a resin film is affixed on the top | upper surface (namely, convex surface of the decorating film 12) of the keytop 2 in the keytop molded object 80 (step S204). . The polyethylene film 61 used in this embodiment is the same film as that used in the first embodiment, and is a film having a thickness of 60 to 70 microns with an adhesive material 62 attached on one side. On the surface on the front side of the key top molded body 80, a convex portion that becomes the top surface of the key top 2 and a concave portion 7 that separates the key tops 2 are formed. The polyethylene film 61 is attached so as to be in close contact with only the convex portion of the key top molded body 80 and leave a space for the concave portion 7. The key top molded body 80 to which the polyethylene film 61 is pasted is placed on the jig 60 so that the polyethylene film 61 side contacts the jig 60.

  Next, the laser light 70 is condensed at a position 82 opposite to the concave portion 7 in the key top molded body 80, and the key top molded body 80 is cut for each key top 2 while scanning the laser 70 (step S205). . In this embodiment, the thickness of the key top molded body 80 at the position of the recess 7 is 0.4 mm. Further, the thickness of the key top molded body 80 at the position of the top surface of the key top 2 is 0.8 mm. There is a difference of 0.4 mm to 0.8 mm between the position where the polyethylene film 61 is pasted and the position where the laser 70 is condensed during laser cutting. For this reason, the laser 70 is not focused on the polyethylene film 61. Therefore, only the position of the concave portion 7 of the key top molded body 80 can be cut without completely cutting the polyethylene film 61. In this embodiment, even if the depth of the recess 7 is smaller than 0.4 mm, the key top molded body 80 can be cut while leaving the polyethylene film 61, but when laser cutting is performed with a condensing diameter in the following range. More preferably, the depth of the recess 7 is 0.2 mm or more.

  In this embodiment, the condensed diameter of the laser 70 is φ0.05 mm to φ0.2 mm. The laser scanning speed is about 200 mm / sec. The laser 70 is scanned 1-3 times on the same path. Also in this embodiment, as in the first embodiment, a carbon dioxide laser generator with a maximum output of 30 W is used as the laser processing machine. The scanning speed of the laser is 200 mm / sec. The laser output is 70% of the maximum output.

  As a result of laser-cutting the key top molded body 80 under the above conditions, a slit 8 having a width of 0.2 mm to 0.3 mm is formed at the position of the concave portion 7 of the key top molded body 80 as shown in FIG. In other words, the plurality of key tops 2 are dispersedly arranged at predetermined positions on the polyethylene film 61 with the slits 8 having a width of 0.2 mm to 0.3 mm.

  In step S205, the fine powder of the resin melted, vaporized or sublimated by the heat of the laser 70 is sucked using an external suction machine. However, some of the fine powder is captured by the adhesive material 62 of the polyethylene film 61. Since the polyethylene film 61 is in close contact with the top surface of the key top 2, resin fine powder at the cutting allowance does not adhere to the top surface of the key top 2, and the top surface of the key top 2 can be kept clean. Further, since the top surface of the key top 2 is not in direct contact with the jig 60, it is possible to effectively prevent the top surface of the key top 2 from being damaged. Furthermore, since each key top 2 is affixed as it is to the polyethylene film 61 after being cut using the laser 70, a carrier (transport medium) for affixing the polyethylene film 61 to each key top 2 on the key sheet 4 Available as Therefore, it is not necessary to stick the key tops 2 on the key sheet 4 individually.

  Next, as shown in FIG. 18, the key top 2 is stuck to the key sheet 4 through the adhesive layer 3 (step S206). The key sheet 4 can be a rubber-like elastic sheet (for example, a silicone rubber sheet) or an EL sheet. In the step S206, the plurality of key tops 2 are attached to the key sheet 4 with their top surfaces attached to the polyethylene film 61.

  Next, the pressing element 6 having an area smaller than each key top 2 is attached to the pressing position of each key top 2 on the back side of the key sheet 4 via the adhesive layer 5 (step S207). Finally, the polyethylene film 61 is removed from the top surface of each key top 2 (step S208). Note that step S207 and step S208 may be reversed. Thus, the push button switch member 1 as shown in FIG. 19 is completed.

  The preferred embodiments of the method for manufacturing a pushbutton switch member of the present invention have been described above, but the present invention is not limited to the above-described embodiments and can be implemented in various modifications. is there.

  For example, in the first embodiment, the decoration process (step S101) on the film 10 may be performed after the molding process of the film 10 (step S102). Moreover, the formation process (step S103) of the top core 21 may be a process using a resin other than the ultraviolet curable resin. Alternatively, only the step of injecting an adhesive made of an ultraviolet curable resin into the concave portion 20 of the film molded body 13 may be performed without performing the step of forming the top core 21 (step S103). Moreover, the sticking process (step S110) of the presser 6 does not necessarily need to be performed. In such a case, it is preferable that step S109 be a step of attaching a key sheet to which the shape of the presser 6 has been given in advance.

  In the second embodiment, the step of arranging the decorative film 12 in the mold (step S202) is not performed, the molding step of the decorative film 12 (the same step as step S102) is performed, and the result is obtained. Alternatively, the core-shaped molded body may be bonded to the concave portion 20 of the film molded body 13, and then the steps after step S <b> 204 may be performed. Moreover, the sticking process (step S207) of the presser 6 does not necessarily need to be performed. In such a case, it is preferable that step S206 be a step of attaching a key sheet to which the shape of the presser 6 has been previously applied.

  In each of the above-described embodiments, the polyethylene film 61 is employed as the resin film. However, instead of the polyethylene film 61, another resin film made of a fluororesin or the like may be employed.

  INDUSTRIAL APPLICABILITY The present invention can be used in industries that manufacture or use portable electronic terminals equipped with pushbutton switch members.

It is a top view of the member for pushbutton switches obtained using the manufacturing method of the member for pushbutton switches which concerns on 1st embodiment of this invention. It is sectional drawing at the time of cutting the member for pushbutton switches shown in FIG. 1 in the AA line of FIG. It is a flowchart which shows the flow of the main processes of the manufacturing method of the member for pushbutton switches which concerns on 1st embodiment of this invention. It is a figure for demonstrating the manufacturing method of the member for pushbutton switches shown in FIG. FIG. 5 is a diagram for explaining a method for manufacturing the member for a push button switch shown in FIG. 3 following FIG. 4. FIG. 6 is a diagram for explaining a method for manufacturing the member for a push button switch shown in FIG. 3 following FIG. 5. FIG. 7 is a diagram for explaining a method for manufacturing the member for a push button switch shown in FIG. 3 following FIG. 6. FIG. 8 is a diagram for explaining a manufacturing method of the member for the push button switch shown in FIG. 3 following FIG. 7. FIG. 9 is a diagram for explaining a method for manufacturing the member for the push button switch shown in FIG. 3 following FIG. 8. FIG. 10 is a diagram for explaining a method of manufacturing the member for the push button switch shown in FIG. 3 following FIG. 9. FIG. 11 is a diagram for explaining a method of manufacturing the member for the push button switch shown in FIG. 3 following FIG. 10. FIG. 12 is a diagram for explaining a manufacturing method of the member for the push button switch shown in FIG. 3 following FIG. 11. FIG. 13 is a diagram for explaining a method of manufacturing the member for the push button switch shown in FIG. 3 following FIG. 12. It is a flowchart which shows the flow of the main processes of the manufacturing method of the member for pushbutton switches which concerns on 2nd embodiment of this invention. It is a figure for demonstrating the manufacturing method of the member for pushbutton switches shown in FIG. FIG. 15 is a diagram for explaining a manufacturing method of the member for the push button switch shown in FIG. 14 following FIG. 15. FIG. 17 is a diagram for explaining a manufacturing method of the member for the push button switch shown in FIG. 14 following FIG. 16. FIG. 18 is a diagram for explaining a manufacturing method of the member for the push button switch shown in FIG. 14 following FIG. 17. FIG. 19 is a diagram for explaining a manufacturing method of the member for the push button switch shown in FIG. 14 following FIG. 18.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Member for pushbutton switches 2 Key top 4 Key sheet 7 Recess 13 Key top molding 61 Resin film 70 Laser light

Claims (2)

A method for manufacturing a member for a push button switch having a plurality of key tops,
In a key top molded body having a recess recessed in a downward direction from the top surface of the key top at the boundary between the plurality of key tops, and in a state where the plurality of key tops are connected by the recess, A film pasting step of pasting a resin film on the top side of the key top without closely contacting;
A key that separates the key top molded body into the plurality of key tops while condensing the laser beam on the processed portion of the recess from the surface opposite to the side where the resin film is pasted, leaving the resin film. A top separation process;
A key sheet attaching step of attaching a key sheet to the back side of the plurality of key tops, with the resin film attached to the top surfaces of the plurality of key tops,
The manufacturing method of the member for pushbutton switches characterized by including this.   The method for manufacturing a member for a push button switch according to claim 1, wherein the resin film is made of a polyolefin resin.

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